WO2005050039A1 - Anti-friction bearing, especially for a steering column - Google Patents

Anti-friction bearing, especially for a steering column Download PDF

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Publication number
WO2005050039A1
WO2005050039A1 PCT/FR2004/002516 FR2004002516W WO2005050039A1 WO 2005050039 A1 WO2005050039 A1 WO 2005050039A1 FR 2004002516 W FR2004002516 W FR 2004002516W WO 2005050039 A1 WO2005050039 A1 WO 2005050039A1
Authority
WO
WIPO (PCT)
Prior art keywords
radial
raceway
added
ring
envelope
Prior art date
Application number
PCT/FR2004/002516
Other languages
French (fr)
Inventor
Jacques Delos
Original Assignee
Aktiebolaget Skf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aktiebolaget Skf filed Critical Aktiebolaget Skf
Priority to EP04791471A priority Critical patent/EP1678426A1/en
Priority to JP2006537341A priority patent/JP2007510114A/en
Publication of WO2005050039A1 publication Critical patent/WO2005050039A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
    • F16C19/166—Four-point-contact ball bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F16C25/08—Ball or roller bearings self-adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
    • F16C33/61—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings formed by wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/24—Steering systems, e.g. steering rods or columns

Definitions

  • the invention relates to the field of rolling bearings, in particular for steering columns.
  • the bearing preferably operates with zero play so that the driver does not feel unpleasant and disturbing sensations at the steering wheel.
  • Document FR-A-2 829 536 discloses a bearing comprising an outer ring and an inner ring, U-shaped, comprising four treated steel wires mounted in contact with the rings, a row of balls arranged in contact with the wires which constitute the raceways, and an elastic element mounted axially between a radial portion of the outer ring and one of the wires.
  • the wires are in the form of annular rods whose ends come end to end when they are in place.
  • the elastic element is a washer with a radial portion in contact with a radial portion of the outer ring and an axial portion in contact with an axial portion of the outer ring.
  • a unit comprising the inner ring is formed, the wires, the balls and the elastic element. Then, this unit is mounted in an outer ring with an L-shaped section, before the formation of one of the radial portions which is also in the form of an axial extension, then the said axial extension is folded to form said radial portion.
  • Such bearings are frequently used in steering columns which accommodate bearings whose dimensional and functional precision does not need to be very high.
  • the rolling device with added tracks comprises an outer ring, an inner ring and at least one row of rolling elements arranged between the rings, at least one of said rings comprising an envelope. and two added annular raceways arranged in the envelope and in contact with said envelope.
  • the bearing comprises at least one radially elastic ring, coming to bear between a radial portion of the casing and one of the added raceways, and exerting on said added raceway a force comprising an axial component and a radial component, the radial component being directed towards an axial portion of the envelope.
  • the elastic ring can advantageously be opened at a point on its circumference.
  • a bearing has the advantage of being able to be manufactured by the same automated production line as that used for the manufacture of bearings not comprising a ring. Indeed, having a cross section of diameter smaller than the space existing between the outer ring and the inner ring and thanks to its elastic properties, the ring can be mounted once the operations of bearing assembly are complete. It only requires providing downstream of the production chain, a machine capable of shrinking the ring and introducing it inside the bearing. The elastic ring, once released, tends to resume its initial shape and comes to bear between the radial portion of the envelope and the corresponding added raceway. Such a bearing also makes it possible to generate a limited manufacturing cost.
  • the cost of the elastic element is particularly reduced compared to the cost of the elements used in the devices of the prior art.
  • the elastic ring exerts a permanent force on the first race comprising an axial component and a radial component.
  • the axial component of the force exerted on the first added raceway makes it possible to prestress the row of rolling elements against surfaces of the inner ring forming raceways and against the second reported raceway.
  • the axial component of the force exerted by the elastic ring in combination with an assembly of the added raceways, each in contact with a radial portion of the envelope of the bearing, allows a correction of the internal axial clearances existing in the bearing after its manufacture between the rolling elements and the added raceways and between the added raceways and the radial portions of the enclosure.
  • the radial component of the force exerted on the first added raceway makes it possible to push said added raceway towards the axial portion of the outer casing in order to maintain zero radial clearance in the bearing.
  • the force exerted by the ring can therefore make it possible to make up for the axial internal clearances existing in the bearing after its manufacture between the rolling elements and the added raceways and between the added raceways and the portions radial of the enclosure, but also to make up for the internal radial clearances between the added raceways and the axial portion of the enclosure.
  • the internal clearances of the bearing, radial or axial, due to wear at the level of the contact surfaces between the rolling elements and the raceways during operation are also taken up during operation of the bearing, which avoids harmful sensations for the user of such a bearing, in particular when the bearing is mounted on a shaft of a steering column.
  • the added raceway is in contact with the elastic ring on a surface portion of the added raceway inclined relative to a radial plane.
  • the elastic ring has a section of diameter smaller than the diameter of the section of a wire forming an attached raceway.
  • Such a ring has the advantage of being able to be placed in the outer ring of the bearing without interfering with the row of rolling elements and of not significantly increasing the axial size of the bearing.
  • the elastic ring and the added raceway bear against the same internal radial face of one of the radial portions. Such an embodiment makes it possible not to modify the axial size of the bearing.
  • one of the radial portions comprises a first internal radial face on which the added raceway bears and a second internal radial face offset towards the outside and radially towards the inside with respect to the first radial face internal on which the elastic ring is supported.
  • the elastic ring is offset radially inwards relative to a shoulder of the radial portion. The elastic ring is only in contact with the added raceway and the radial portion of the envelope, it certainly exerts a prestressing force having an axial component and a radial component in order to be able to make up for the different types of play in the bearing, either before its manufacture or during use.
  • the elastic ring is arranged in the outer ring.
  • the outer ring can comprise a groove with a V-shaped cross section with two substantially frustoconical surfaces each forming a raceway.
  • the elastic ring is arranged in the inner ring.
  • at least one added raceway has a circular section.
  • at least one added raceway has a cross section comprising a concave part forming a raceway.
  • the added raceway is circumferentially continuous or discontinuous.
  • the invention also relates to a steering column comprising a shaft and two bearings mounted on the shaft.
  • At least one of the bearings comprises an outer ring, an inner ring and at least one row of rolling elements arranged between the rings, at least one of said rings comprising an envelope and two added annular raceways arranged in the envelope and at contact with said casing, said bearing comprising at least one radially elastic ring coming to bear between a radial portion of the casing and one of the added raceways, and exerting on said added raceway a force comprising an axial component and a radial component, the radial component being directed towards an axial portion of the envelope.
  • the invention finally relates to a method of manufacturing a rolling device in which a sub-assembly is mounted comprising a ring and rolling elements, a first rolling path is placed against a radial portion of an envelope, said said is placed sub-assembly in said envelope so that the rolling elements are in contact with the raceway, there is a second raceway in the envelope in contact with the rolling elements, the envelope is crimped and at least one elastic ring is introduced into the bearing after the crimping operation, said elastic element being mounted in abutment between the radial portion and one of the added raceways.
  • the elastic ring is introduced in abutment against a second internal radial face of the radial portion of the envelope, offset axially towards the outside and radially towards the inside with respect to a first internal radial face of the radial portion of the enclosure on which the corresponding raceway is supported.
  • the bearing is capable of operating, both under radial load, under axial load, or under combined load without play after its manufacture and also during its use.
  • the bearing is particularly simple, economical, rigid. It also has the advantage of being able to be obtained by inserting the elastic element in an already manufactured bearing.
  • FIG. 1 is a half-view in axial section a rolling bearing according to a first embodiment of the invention
  • FIG. 2 is a half view in axial section of a rolling bearing according to a second embodiment of the invention
  • FIG. 3 is a half view in axial section of a rolling bearing according to a third embodiment of the invention
  • FIG. 4 is a half view in axial section of a rolling bearing according to a fourth embodiment of the invention.
  • - Figure 5 is a half view in axial section of a rolling bearing according to a fifth embodiment of the invention.
  • the bearing 1 comprises an inner ring 2, an outer ring 3, two paths of bearing 4 and 5 added in the form of wires, a row of rolling elements 6, a cage 7 and an elastic ring 8.
  • the inner ring 2 is of massive type.
  • solid type ring is understood to mean a ring whose shape is obtained by machining with chip removal (turning, grinding) from tubes, bars, forged and / or rolled blanks.
  • the inner ring 2 comprises a bore 2a of cylindrical shape delimited by radial front surfaces 2b and 2c, and an outer cylindrical surface 2d from which is formed a circular groove 9 of V section, that is to say having two substantially frustoconical surfaces 9a and 9b symmetrical on either side of a radial plane passing through the center of the rolling elements, with connection fillets.
  • the frustoconical surfaces 9a and 9b form raceways on which the row of rolling elements 6 move.
  • the rolling elements 6 are produced by balls.
  • the outer ring 3 comprises an outer casing 10 of annular shape with a general U-shaped section, with an axial portion 11, a radial portion 12 and a radial portion 13.
  • the radial portion 12 has a thickness less than the thickness of the axial portion 11 and the radial portion 13 and a length, in the radial direction, less than the length of the radial portion 13. In other words, the space separating the radial portion 12 from the outer cylindrical surface 2d is greater than that separating the radial portion 13 from the outer cylindrical surface 2d.
  • the radial portion 13 has a first inner radial face 13a, connecting to the bore l ia of the axial portion 11, and to a second inner radial face 13b, offset axially outward and radially inward relative to the first inner radial face 13a, by a shoulder 13c.
  • the added raceways 4 and 5 are in the form of annular rods, the ends of which come end to end and are arranged in the outer casing 10 in direct contact therewith.
  • the added raceways 4 and 5 are formed at from rolled wires, the ends of which come end to end when the rods are placed in the outer casing 10.
  • the raceway 4 is placed in contact with the bore l ia of axial portion 11 and with the first radial face internal 13a of the radial portion 13.
  • the raceway 5 is disposed in contact with the bore l ia of axial portion 11 and with an internal radial face 12a of the radial wall 12.
  • the rolling elements 6, here balls, are disposed between the raceways 4 and 5 of the outer ring 3, and the frustoconical surfaces 9a and 9b forming the raceways of the inner ring 2.
  • a bearing is thus produced with four contact points.
  • the cage 7 comprises an annular portion 7a disposed, on the side of the radial portion 12, radially between the free end of the radial portion 12 and the cylindrical surface 2d of the inner ring 2, and cells 7b housing the rolling elements 6.
  • the cage 7 thus maintains the rolling elements 6 at regular circumferential spacing.
  • the elastic ring 8 is in the form of an open torus at a point on its circumference and is placed in contact with the second internal radial face 13b of the radial portion 13 and with the raceway 4.
  • the elastic ring 8 has a diameter less than the diameter of the section of the wire forming the raceway 4, and is offset radially inwards relative to the shoulder 13c of the radial portion 13.
  • the raceway 4 is in contact with the ring 8 on a surface portion 4a of the raceway 4, inclined relative to a radial plane.
  • the surface portion 4a is offset axially outward relative to the rolling elements 6 and radially inwardly relative to the bore l ia of the axial portion 11.
  • the elastic ring 8 exerts a permanent prestressing force on the added raceway 4, in a direction perpendicular to the tangent common to the two profiles, said force comprising an axial component and a radial component.
  • the elastic ring 8 tends, by means of the added raceway 4, to push back and prestress the row of rolling elements 6 on the second added raceway 5 but also on the frustoconical surfaces 9a and 9b of the ring interior 2.
  • the elastic ring 8 tends to push back the added raceway 4 towards the axial portion 11 of the external envelope 10.
  • the elastic ring 8 therefore makes it possible to have a bearing 1 having axial play and zero radial play.
  • the inner ring 2 can be made for example from 100 C6 steel hardened to the core and the wires 4 and 5 can be made from pretreated steel of the "piano cord" type.
  • the combination of the raceways 4 and 5 in the form of wires, on the one hand, and on the massive inner ring 2, on the other hand, makes it possible to reduce wear on the contact surfaces with the rolling elements 6
  • the elastic ring 8 significantly catches the axial and radial play hold. The same applies if the bearing 1 is fitted on a shaft or in a housing with high tightening.
  • the elastic ring 8 makes it possible to maintain a permanent prestress in the bearing 1 but avoids an excessive increase in this internal prestress under the effect of a tight fitting.
  • the prestressing ring 8 therefore plays a role of generator and regulator of prestressing.
  • the elastic ring 8 is disposed inside the outer casing 10 at a second internal radial face 13b of the radial portion 13 offset radially relative to a first internal radial face 13a.
  • the elastic ring 8 has a section of diameter less than the diameter of the section of the wires forming the raceways 4 and 5, so that the shoulder 13c of the radial portion 13 of the casing 10 is of restricted axial dimension.
  • the axial size of the bearing 1 is thus almost identical to that of a bearing not having an elastic prestressing member.
  • this embodiment is in no way limiting, it is conceivable to have the added raceway 4 and the elastic ring 8 on the same internal radial face of the outer casing 10. This arrangement may have the advantage of not affecting the axial size of the bearing 1.
  • the elastic ring 8 is dimensioned so as to remain spaced from the row of rolling elements 6.
  • FIG. 1 is illustrated in dotted lines the positioning of the radial portion 12 before the crimping operation making it possible to complete the mounting of the bearing 1.
  • the casing outer 10 of the bearing then has an L-shaped section which is in the form of a radial extension situated in the extension of the axial portion 11.
  • the above-mentioned sub-assembly is then placed in the exterior envelope 10 so that the rolling elements 6 are in contact with the added raceway 4 and the second added raceway 5 is placed in the exterior envelope 10 in contact with the rolling elements 6.
  • the extension of the axial portion 11 is folded on the last added running track 5 put in place, to give it a radial shape and thus obtain an outer casing 10 having a general cross section U.
  • the radial portion 12 has a thickness less than the thickness of the axial portion 11 and of the radial portion 13, so that it can be folded easily.
  • the elastic prestressing ring being inserted after the manufacture of the bearing, it is possible to use the same production means until the crimping operation for bearings comprising or not comprising prestressing elements. It also becomes possible to produce an entire stock of identical bearings without first knowing whether or not the bearings will be fitted with an elastic element when they are sold, thus making it possible not to lose time to change series and to simplify management. different production units within a manufacturing site.
  • FIG. 2 the references of the elements similar to those of FIG. 1 have been preserved.
  • Reported raceways 14 and 15 replacing the raceways 4 and 5 are in the form of circumferentially continuous rings.
  • the transverse profile of the section of the added raceways 14 and 15 is in no way limiting, with a method of obtaining by machining different shapes are possible, in particular at the level of the surface opposite to the rolling elements 6 on which the elastic ring 8 comes into contact.
  • He can be advantageous for example to obtain an added raceway 14 having a cross section having a bevelled part forming the surface contact portion with the elastic ring 8 and joining a concave part forming a raceway. Thanks to the beveled profile, it is thus possible to obtain a radial portion 13 of the outer casing 10 having a single radial face on which the added raceway 14 and the elastic ring 8 come into contact.
  • the axial size of the bearing 1 is thus affected by the elastic ring 8 only negligibly.
  • the bearing 1 has an inner ring 2 and an outer ring 3 different from that described in the previous embodiments.
  • the radial portion 13 of the outer casing 10 of the outer ring 3 has a single inner face 13a.
  • the inner ring 2 comprises an inner envelope 20 of annular shape with a general U-shaped section, with an axial portion 21, a radial portion 22 and a radial portion 23.
  • the radial portion 23 has a length, in the radial direction, less than the length of the radial portion 22.
  • the radial portion 22 has a first internal radial face 22a, connecting to an external surface 21a of the axial portion 21 and to a second internal radial face 22b, offset axially towards the outside and radially towards the inside relative to the first internal radial face 22a, by a shoulder 22c.
  • the added raceways 24 and 25 of the same type as the added raceways 4 and 5 are also in the form of wires.
  • the added raceway 24 is disposed in contact with the outer surface 21a of the axial portion 21 and with the first internal radial face 22a of the radial portion 22.
  • the added raceway 25 is disposed in contact with the outer surface 21a of the axial portion 21 and with the first internal radial face 22a of the radial wall 22.
  • the elastic ring 8 disposed in contact with the second internal radial face 22b of the radial portion 22 and with the added raceway 24, is offset radially with respect to the shoulder 22c of the radial portion 22.
  • the added raceway 24 is in contact with the elastic ring 8 by a surface portion 24a of the wire 24 inclined with respect to a radial plane.
  • the surface portion 24a is offset axially outward with respect to the rolling elements 6 and radially inward with respect to the bore 21a of the axial portion 21.
  • the elastic ring 8 acts by contraction and not by expansion for exert a prestress on the added raceway 24.
  • FIG. 4 the references of the elements similar to those of FIG. 3 have been preserved.
  • the raceways 26 and 27 replacing the added raceways 24 and 25 are annular.
  • the inner ring 2 is symmetrical relative to a radial plane passing through the center of the rolling elements 6.
  • the inner ring 2 comprises an inner envelope 20 of annular shape with a general U-shaped section with an axial portion 21 and two radial portions 22 and 23 symmetrical.
  • the raceway 25 is arranged in contact with the outer surface 21 a of the portion axial 21 and with the first internal radial face 23a of the radial portion 23.
  • the ring 31 is disposed in contact with the second internal radial face 23b of the radial portion 23 and with the raceway 25 and is offset radially with respect to the shoulder 23c of the radial portion 23.
  • the elastic rings 8 and 31 exert forces, via the raceways 24 and 25, on the row of rolling elements 6, on each side of a passing radial plane by the center of the rolling elements 6.
  • the bearing obtained is particularly simple, economical and rigid.
  • the bearing is capable of operating without play after its manufacture and has a very high stability over time of the internal prestressing characteristics.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Support Of The Bearing (AREA)
  • Steering Controls (AREA)

Abstract

The invention relates to an anti-friction bearing (1) with inserted raceways. Said bearing comprises an outer ring (3), an inner ring (2), and at least one row of rolling elements (6) arranged between the rings, at least one of said rings comprising an envelope (10) and two annular inserted raceways (4, 5) that are arranged in the envelope (10). The inventive bearing (1) comprises at least one radially elastic ring (8) that is applied between a radial portion (13) of the envelope (10) and one of the inserted raceways (4).

Description

Palier à roulement, notamment pour colonne de direction Rolling bearing, especially for steering column
L'invention concerne le domaine des paliers à roulement, notamment pour colonnes de direction. Dans ce type d' application, le roulement fonctionne d préférence avec un jeu nul pour que le conducteur ne ressente pas au niveau du volant des sensations désagréables et perturbantes. On connaît par le document FR-A-2 829 536 un roulement comprenant une bague extérieure et une bague intérieure, à section en U, comprenant quatre fils en acier traité montés en contact avec les bagues, une rangée de billes disposées au contact des fils qui constituent les chemins de roulement, et un élément élastique monté axialement entre une portion radiale de la bague extérieure et l'un des fils. Les fils se présentent sous la forme de joncs annulaires dont les extrémités viennent bout à bout quand ils sont en place. L'élément élastique est une rondelle avec une portion radiale en contact avec une portion radiale de la bague extérieure et une portion axiale en contact avec une portion axiale de la bague extérieure Pour monter un tel roulement, on forme une unité comprenant la bague intérieure, les fils, les billes et l'élément élastique. Puis, on monte cette unité dans une bague extérieure à section en L, avant la formation d'une des portions radiales se présentant encore sous forme d'une extension axiale, puis on procède au pliage de ladite extension axiale pour former ladite portion radiale. On réalise ainsi un roulement à quatre points de contact capable de fonctionner aussi bien sous charge axiale que sous charge radiale ou sous charge combinée. De tels roulements sont fréquemment utilisés dans les colonnes de direction qui s'accommodent de roulements dont la précision dimensiόnnelle et fonctionnelle n' a pas besoin d' être très élevée. Afin que le roulement puisse fonctionner sans jeu avec une précontrainte calibrée, on dispose donc un élément de précontrainte entre l'une des portions radiales de la bague extérieure et le fil correspondant qui exerce un effort de précontrainte entre les billes et les fils d'une part, entre les fils et les enveloppes d' autre part, rattrapant ainsi tous les jeux résiduels entre ces éléments. De tels types de roulements à quatre points de contact par fils présentent toutefois certains inconvénients. D' une part, ils comportent un élément élastique de précontrainte devant être mis en place avant l' opération de sertissage de la bague extérieure ce qui nécessite un procédé de fabrication différent de celui utilisé pour réaliser des roulements ne présentant pas d' élément de précontrainte. D' autre part, le prix de cet élément élastique est relativement élevé. La présente invention a donc pour objet de résoudre ces inconvénients en proposant un roulement comprenant un élément élastique, permettant de se dégager de contraintes de fabrication spécifiques, et étant plus économique. A cet effet, le dispositif de roulement à pistes rapportées, selon un aspect de l' invention, comprend une bague extérieure, une bague intérieure et au moins une rangée d'éléments roulants disposés entre les bagues, au moins une desdites bagues comprenant une enveloppe et deux chemins de roulement annulaires rapportés disposés dans l' enveloppe et au contact de ladite enveloppe. Le roulement comprend au moins un anneau élastique radialement, venant en appui entre une portion radiale de l' enveloppe et l'un des chemins de roulement rapportés, et exerçant sur ledit chemin de roulement rapporté un effort comprenant une composante axiale et une composante radiale, la composante radiale étant dirigée en direction d'une portion axiale de l ' enveloppe. L' anneau élastique peut avantageusement être ouvert en un point de sa circonférence. Un tel roulement présente l' avantage de pouvoir être fabriqué par une même chaîne de production automatisée que celle utilisée pour la fabrication de roulement ne comprenant pas d' anneau. En effet, ayant une section de diamètre inférieur à l' espace existant entre la bague extérieure et la bague intérieure et grâce à ses propriétés élastiques, l' anneau peut être monté une fois que les opérations de montage du roulement sont terminées. Il nécessite uniquement de prévoir en aval de la chaîne de production, une machine capable de rétreindre l'anneau et de l'introduire à l'intérieur du roulement. L'anneau élastique, une fois libéré, tend à reprendre sa forme initiale et vient en appui entre la portion radiale de l' enveloppe et le chemin de roulement rapporté correspondant. Un tel roulement permet également d' engendrer un coût restreint de fabrication. En effet, en plus de ne pas engendrer de coût supplémentaire relatif à une chaîne de production propre à ce type de roulement, le coût de l' élément élastique est particulièrement réduit par rapport au coût des éléments utilisés dans les dispositifs de l'art antérieur. L' anneau élastique exerce un effort permanent sur le premier chemin de roulement comprenant une composante axiale et une composante radiale. La composante axiale de l'effort exercé sur le premier chemin de roulement rapporté permet de précontraindre la rangée d' élément roulants contre des surfaces de la bague intérieure formant chemins de roulement et contre le second chemin de roulement rapporté. La composante axiale de l'effort exercé par l' anneau élastique, en combinaison avec un montage des chemins de roulement rapportés, chacun en contact avec une portion radiale de l'enveloppe du roulement, permet un rattrapage des jeux internes axiaux existants dans le roulement après sa fabrication entre les éléments roulants et les chemins de roulement rapportés et entre les chemins de roulement rapportés et les portions radiales de l ' enveloppe. La composante radiale de l' effort exercé sur le premier chemin de roulement rapporté permet de repousser ledit chemin de roulement rapporté vers la portion axiale de l' enveloppe extérieure afin de maintenir un jeu radial nul dans le roulement. L' effort exercé par l' anneau peut donc permettre de rattraper les jeux internes axiaux existants dans le roulement après sa fabrication entre les éléments roulants et les chemins de roulement rapportés et entre les chemins de roulement rapportés et les portions radiales de l' enveloppe, mais également de rattraper les jeux internes radiaux entre les chemins de roulement rapportés et la portion axiale de l' enveloppe. En outre, les jeux internes du roulement, radiaux ou axiaux, dus à l 'usure au niveau des surfaces de contact entre les éléments roulants et les chemins de roulement lors du fonctionnement, sont également rattrapés lors du fonctionnement du roulement, ce qui évite des sensations néfastes pour l'utilisateur d' un tel roulement, notamment lorsque le roulement est monté sur un arbre d'une colonne de direction. Avantageusement, le chemin de roulement rapporté est en contact avec l' anneau élastique sur une portion de surface du chemin de roulement rapporté inclinée par rapport à un plan radial. Dans un mode de réalisation, l' anneau élastique a une section de diamètre inférieur au diamètre de la section d'un fil formant un chemin de roulement rapporté. Un tel anneau présente l'avantage de pouvoir être placé dans la bague extérieure du roulement sans interférer avec la rangée d'éléments roulants et de ne pas augmenter sensiblement l ' encombrement axial du roulement. Dans un mode de réalisation, l'anneau élastique et le chemin de roulement rapporté sont en appui contre une même face radiale interne d'une des portions radiales. Un tel mode de réalisation permet de ne pas modifier l' encombrement axial du roulement. Dans un autre mode de réalisation, une des portions radiales comprend une première face radiale interne sur laquelle le chemin de roulement rapporté prend appui et une deuxième face radiale interne décalée vers l' extérieur et radialement vers l'intérieur par rapport à la première face radiale interne sur laquelle l' anneau élastique prend appui. Avantageusement, l' anneau élastique est décalé radialement vers l'intérieur par rapport à un épaulement de la portion radiale. L' anneau élastique est uniquement en contact avec le chemin de roulement rapporté et la portion radiale de l' enveloppe, il exerce de façon certaine un effort de précontrainte ayant une composante axiale et une composante radiale afin de pouvoir rattraper les différents types de jeux dans le roulement que ce soit avant sa fabrication ou en cours d' utilisation. Dans un mode de réalisation de l'invention, l'anneau élastique est disposé dans la bague extérieure. La bague extérieure peut comprendre une gorge à section droite en V avec deux surfaces sensiblement tronconiques formant chacune une piste de roulement. Dans un autre mode de réalisation de l' invention, l ' anneau élastique est disposé dans la bague intérieure. Dans un mode de réalisation de l' invention, au moins un chemin de roulement rapporté présente une section circulaire. Dans un autre mode de réalisation de l' invention, au moins un chemin de roulement rapporté présente une section transversale comprenant une partie concave formant une piste de roulement. Dans un mode de réalisation de l' invention, le chemin de roulement rapporté est circonférentiellement continu ou discontinu. L'invention concerne également une colonne de direction comprenant un arbre et deux roulements montés sur l' arbre. Au moins l' un des roulements comprend une bague extérieure une bague intérieure et au moins une rangée d'éléments roulants disposés entre les bagues, au moins une desdites bagues comprenant une enveloppe et deux chemins de roulement annulaires rapportés disposés dans l ' enveloppe et au contact de ladite enveloppe, ledit roulement comprenant au moins un anneau radialement élastique venant en appui entre une portion radiale de l'enveloppe et l ' un des chemins de roulement rapportés, et exerçant sur ledit chemin de roulement rapporté un effort comprenant une composante axiale et une composante radiale, la composante radiale étant dirigée en direction d'une portion axiale de l'enveloppe. L'invention concerne enfin un procédé de fabrication d'un dispositif de roulement dans lequel on monte un sous-ensemble comprenant une bague et des éléments roulants, on place un premier chemin de roulement contre une portion radiale d'une enveloppe, on place ledit sous-ensemble dans ladite enveloppe de façon que les éléments roulants soient en contact avec le chemin de roulement, on dispose un deuxième chemin de roulement dans l'enveloppe au contact des éléments roulants, on effectue une opération de sertissage de l ' enveloppe et on introduit au moins un anneau élastique dans le roulement après l' opération de sertissage, ledit élément élastique étant monté en appui entre la portion radiale et l' un des chemins de roulement rapportés. Avantageusement, on introduit l' anneau élastique en appui contre une deuxième face radiale interne de la portion radiale de l' enveloppe, décalée axialement vers l' extérieur et radialement vers l'intérieur par rapport à une première face radiale interne de la portion radiale de l 'enveloppe sur laquelle le chemin de roulement correspondant est en appui. Le roulement est capable de fonctionner, aussi bien sous charge radiale, sous charge axiale, ou sous charge combinée sans jeu après sa fabrication et également pendant son utilisation. En outre, le roulement est particulièrement simple, économique, rigide. Il a également l' avantage de pouvoir être obtenu par insertion de l' élément élastique dans un roulement déjà fabriqué. La présente invention sera mieux comprise à l' étude de la description détaillée d'un mode de réalisation pris à titre d' exemple nullement limitatif et illustré par les dessins annexés, sur lesquels : - la figure 1 est une demi-vue en coupe axiale d'un palier à roulement selon un premier mode de réalisation de l'invention; -la figure 2 est une demi-vue en coupe axiale d' un palier à roulement selon un deuxième mode de réalisation de l'invention; -la figure 3 est une demi-vue en coupe axiale d'un palier à roulement selon un troisième mode de réalisation de l'invention; et -la figure 4 est une demi-vue en coupe axiale d'un palier à roulement selon un quatrième mode de réalisation de l'invention. - la figure 5 est une demi-vue en coupe axiale d'un palier à roulement selon un cinquième mode de réalisation de l'invention. Comme on peut le voir sur la figure 1, le roulement 1 comprend une bague intérieure 2, une bague extérieure 3, deux chemins de roulement 4 et 5 rapportés sous la forme de fils, une rangée d' éléments roulants 6, une cage 7 et un anneau 8 élastique. La bague intérieure 2 est de type massive. On entend par bague de type massive une bague dont la forme est obtenue par usinage avec enlèvement de copeaux (tournage, rectification) à partir de tubes, de barres, d'ébauches forgées et/ou roulées. La bague intérieure 2 comprend un alésage 2a de forme cylindrique délimité par des surfaces frontales radiales 2b et 2c, et une surface cylindrique extérieure 2d à partir de laquelle est formée une gorge circulaire 9 à section en V, c'est-à-dire présentant deux surfaces sensiblement tronconiques 9a et 9b symétriques de part et d'autre d'un plan radial passant par le centre des éléments roulants, avec des congés de raccordement. Les surfaces tronconiques 9a et 9b forment des chemins de roulement sur lesquels se déplacent la rangée d'éléments roulants 6. Les éléments roulants 6 sont réalisés par des billes. La bague extérieure 3 comporte une enveloppe extérieure 10 de forme annulaire à section générale en U, avec une portion axiale 11 , une portion radiale 12 et une portion radiale 13. La portion radiale 12 présente une épaisseur inférieure à l' épaisseur de la portion axiale 11 et de la portion radiale 13 et une longueur, dans le sens radial, inférieure à la longueur de la portion radiale 13. En d' autres termes, l ' espace séparant la portion radiale 12 de la surface cylindrique extérieure 2d est supérieur à celui séparant la portion radiale 13 de la surface cylindrique extérieure 2d. La portion radiale 13 présente une première face radiale intérieure 13a, se raccordant à l'alésage l ia de la portion axiale 11 , et à une deuxième face radiale intérieure 13b, décalée axialement vers l' extérieur et radialement vers l'intérieur par rapport à la première face radiale intérieure 13a, par un epaulement 13c. En d'autres termes, le diamètre de l'alésage l ia est supérieur au diamètre de l' épaulement 13c. Les chemins de roulement rapportés 4 et 5 se présentent sous la forme de joncs annulaires dont les extrémités viennent bout à bout et sont disposés dans l' enveloppe extérieure 10 en contact direct avec celle-ci. Les chemins de roulement rapportés 4 et 5 sont formés à partir de fils roulés dont les extrémités viennent bout à bout quand les joncs sont mis en place dans l' enveloppe extérieure 10. Le chemin de roulement 4 est disposé en contact avec l' alésage l ia de portion axiale 11 et avec la première face radiale interne 13a de la portion radiale 13. Le chemin de roulement 5 est disposé en contact avec l'alésage l ia de portion axiale 11 et avec une face radiale interne 12a de la paroi radiale 12. Les éléments roulants 6, ici des billes, sont disposés entre les chemins de roulement 4 et 5 de la bague extérieure 3, et les surfaces tronconiques 9a et 9b formant des chemins de roulement de la bague intérieure 2. On réalise ainsi un roulement à quatre points de contacts. La cage 7 comprend une portion annulaire 7a disposée, du côté de la portion radiale 12, radialement entre l'extrémité libre de la portion radiale 12 et la surface cylindrique 2d de la bague intérieure 2, et des alvéoles 7b logeant les éléments roulants 6. La cage 7 maintient ainsi les éléments roulants 6 à espacement circonférentiel régulier. L' anneau élastique 8 se présente sous la forme d'un tore ouvert en un point de sa circonférence et est disposé en contact avec la deuxième face radiale interne 13b de la portion radiale 13 et avec le chemin de roulement 4. L' anneau élastique 8 possède un diamètre inférieur au diamètre de la section du fil formant le chemin de roulement 4, et est décalé radialement vers l 'intérieur par rapport à l'épaulement 13 c de la portion radiale 13. Le chemin de roulement 4 est en contact avec l ' anneau 8 sur une portion de surface 4a du chemin de roulement 4, inclinée par rapport à un plan radial. La portion de surface 4a est décalée axialement vers l'extérieur par rapport aux éléments roulants 6 et radialement vers l'intérieur par rapport à l' alésage l ia de la portion axiale 11. Aux points de contact entre l' anneau élastique 8 et le chemin de roulement rapporté 4, l' anneau élastique 8 exerce un effort permanent de précontrainte sur le chemin de roulement rapporté 4, dans une direction perpendiculaire à la tangente commune aux deux profils, ledit effort comprenant une composante axiale et une composante radiale. Par la composante axiale de l'effort exercé, l' anneau élastique 8 tend, par l' intermédiaire du chemin de roulement rapporté 4, à repousser et à précontraindre la rangée d' éléments roulants 6 sur le deuxième chemin de roulement rapporté 5 mais également sur les surfaces tronconiques 9a et 9b de la bague intérieure 2. Par la composante radiale de l' effort exercé, l' anneau élastique 8 tend à repousser le chemin de roulement rapporté 4 vers la portion axiale 11 de l' enveloppe extérieure 10. L' anneau élastique 8 permet donc d'avoir un roulement 1 ayant un jeu axial et un jeu radial nul. La bague intérieure 2 peut être réalisée par exemple en acier 100 C6 trempé à cœur et les fils 4 et 5 peuvent être réalisés en acier prétraité de type "corde à piano". La combinaison des chemins de roulement 4 et 5 sous la forme de fils, d'une part, et sur la bague intérieure 2 massive, d'autre part, permet de réduire l'usure au niveau des surfaces de contact avec les éléments roulants 6. Toutefois, même si une usure se produit, grâce à ses propriétés élastiques, l' anneau élastique 8 rattrape de façon importante les prises de jeux axiales et radiales. Il en est de même, si le roulement 1 est emmanché sur un arbre ou dans un logement avec un serrage élevé. Dans ce cas, l ' anneau élastique 8 permet de maintenir une précontrainte en permanence dans le roulement 1 mais évite une augmentation excessive de cette précontrainte interne sous l' effet d'un emmanchement serré. L' anneau de précontrainte 8 joue donc un rôle de générateur et de régulateur de précontrainte. L' anneau élastique 8 est disposé à l'intérieur de l' enveloppe extérieure 10 au niveau d'une deuxième face radiale interne 13b de la portion radiale 13 décalée radialement par rapport à une première face radiale interne 13a. L' anneau élastique 8 a une section de diamètre inférieur au diamètre de la section des fils formant les chemins de roulements 4 et 5, afin que l' épaulement 13c de la portion radiale 13 de l' enveloppe 10 soit de dimension axiale restreinte. L' encombrement axial du roulement 1 est ainsi quasiment identique à celui d'un roulement ne présentant pas d' organe élastique de précontrainte. Bien entendu, ce mode de réalisation n' est nullement limitatif, il est envisageable de disposer le chemin de roulement rapporté 4 et l' anneau élastique 8 sur une même face radiale interne de l' enveloppe extérieure 10. Cette disposition peut avoir l ' avantage de ne pas affecter l' encombrement axial du roulement 1. Bien entendu dans ce mode de réalisation, l' anneau élastique 8 est dimensionné de façon à rester espacé de la rangée d' éléments roulants 6. Sur la figure 1, est illustré en pointillé le positionnement de la portion radiale 12 avant l' opération de sertissage permettant de terminer le montage du roulement 1. L' enveloppe extérieure 10 du roulement présente alors une section en L qui se présente sous la forme d'une extension radiale située dans le prolongement de la portion axiale 11. Pour réaliser le montage d'un roulement 1, on réalise dans un premier temps un sous-ensemble constitué par la bague intérieure 2, les éléments roulants 6 et la cage 7. On dispose le premier chemin de roulement rapporté 4 contre la première face radiale 13a de la portion radiale 13 de l' enveloppe extérieure 10, on place ensuite le sous-ensemble précité dans l' enveloppe extérieure 10 de façon que les éléments roulants 6 soient en contact avec le chemin de roulement rapporté 4 et on dispose le deuxième chemin de roulement rapporté 5 dans l' enveloppe extérieure 10 au contact des éléments roulants 6. On procède au pliage de l ' extension de la portion axiale 11 sur le dernier chemin de roulement rapporté 5 mis en place, pour lui conférer une forme radiale et ainsi obtenir une enveloppe extérieure 10 présentant une section générale en U. La portion radiale 12 possède une épaisseur inférieure à l' épaisseur de la portion axiale 11 et de la portion radiale 13 , afin de pouvoir être pliée aisément. Une fois l' opération de sertissage terminé, on rétreint l' anneau élastique 8 de façon à l'introduire entre la bague intérieure 2 et l' enveloppe 10 du côté opposé à la cage 7. L' anneau élastique 8 reprend sa forme par élasticité et vient en appui sur la deuxième face interne 13b de la portion radiale 13 et sur le chemin de roulement rapporté 4. Par rapport aux dispositifs de l' art antérieur, ce dispositif de roulement présente des avantages sur le, plan du montage, il est possible d'utiliser des moyens communs par exemple une même chaîne automatisée de production pour des roulements qui comprennent ou non des anneaux élastiques rattrapant les jeux internes du roulement. En effet, l' anneau élastique de précontrainte étant inséré après la fabrication du roulement, il est envisageable d'utiliser les mêmes moyens de production jusqu' à l' opération de sertissage pour des roulements comprenant ou non des éléments de précontrainte. Il devient également possible de produire un stock entier de roulements identiques sans au préalable savoir si les roulements seront ou non munis d'un élément élastique lors de leur vente, permettant ainsi de ne pas perdre de temps de changement de série et de simplifier une gestion des différentes unités de production au sein d'un site de fabrication. Sur la figure 2, les références des éléments semblables à ceux de la figure 1 ont été conservées. Des chemins de roulement rapportés, 14 et 15 remplaçant les chemins de roulement rapportés 4 et 5, se présentent sous la forme d' anneaux circonférentiellement continus. Leurs sections, passant par l' axe du roulement, présentent des évidements 16 et 17 en arc de cercle de rayon sensiblement égal au rayon des éléments roulants 6, disposés du côté intérieur des chemins de roulement rapportés 14 et 15 et des surfaces d' appui 18 et 19, disposés du côté extérieur des chemins de roulement rapportés 14 et 15. L' anneau élastique 8 est disposé en contact avec la deuxième face radiale interne 13b de la portion radiale 13 et avec la surface d' appui 18. Les chemins de roulement rapportés sous la forme d' anneaux 14 et 15 peuvent être avantageusement réalisés par une méthode d'usinage, par exemple par tournage. Il est ainsi possible de réaliser des chemins de roulement rapportés 14 et 15 de façon économique et simple. Bien entendu, le profil transversal de la section des chemins de roulement rapportés 14 et 15 n'est nullement limitatif, avec un mode d'obtention par usinage différentes formes sont envisageables notamment au niveau de la surface opposée aux éléments roulants 6 sur laquelle l' anneau élastique 8 vient en contact. Il peut être avantageux par exemple d' obtenir un chemin de roulement rapporté 14 présentant une section transversale ayant une partie biseautée formant la portion de surface de contact avec l ' anneau élastique 8 et rejoignant une partie concave formant une piste de roulement. Grâce au profil biseauté, il est ainsi possible d' obtenir une portion radiale 13 de l ' enveloppe extérieure 10 ayant une unique face radiale sur laquelle le chemin de roulement rapporté 14 et l'anneau élastique 8 viennent en contact. L' encombrement axial du roulement 1 n' est ainsi affecté par l ' anneau élastique 8 que de façon négligeable. Il peut être également avantageux de prévoir, par rapport à la forme du chemin de roulement rapporté 14 tel que représentée sur la figure 2, de prévoir un évidement s' étendant axialement en direction des éléments roulants 6 et présentant une longueur sensibl ement égale au diamètre de l' anneau élastique 8 afin de réduire l' encombrement axial du roulement 1, au niveau de la portion de contact avec l 'anneau élastique 8 et le chemin de roulement rapporté 14. Il peut être également possible de réaliser aisément grâce au mode d' obtention par usinage, des chemins de roulement 14 et 15 symétriques par rapport à un plan radial passant par le centre de leur section. Les chemins de roulement rapportés 14 et 15 sont ainsi identiques, ce qui réduit le nombre de pièces différentes à l'intérieur du roulement 1 et permet de monter les chemins de roulement rapportés 14 et 15 sans orientation préalable, ce qui simplifie la chaîne automatisée réalisant la fabrication. Sur la figure 3 , les références des éléments semblables à ceux des figures 1 et 2 ont été conservées. Le roulement 1 comporte une bague intérieure 2 et une bague extérieure 3 différentes de celle décrits lors des mode de réalisations précédents. La portion radiale 13 de l' enveloppe extérieure 10 de la bague extérieure 3 comporte une unique face intérieure 13a. La bague intérieure 2 comporte une enveloppe intérieure 20 de forme annulaire à section générale en U, avec une portion axiale 21 , une portion radiale 22 et une portion radiale 23. La portion radiale 23 présente une longueur, dans le sens radial, inférieure à la longueur de la portion radiale 22. La portion radiale 22 présente une première face radiale interne 22a, se raccordant à une surface extérieure 21a de la portion axiale 21 et à une deuxième face radiale interne 22b, décalée axialement vers l' extérieur et radialement vers l'intérieur par rapport à la première face radiale interne 22a, par un epaulement 22c. Les chemins de roulement rapportés 24 et 25 du même type que les chemins de roulement rapportés 4 et 5, se présentent également sous forme de fils. Le chemin de roulement rapporté 24 est disposé en contact avec la surface extérieure 21a de la portion axiale 21 et avec la première face radiale interne 22a de la portion radiale 22. Le chemin de roulement rapporté 25 est disposé en contact avec la surface extérieure 21a de la portion axiale 21 et avec la première face radiale interne 22a de la paroi radiale 22. L' anneau élastique 8, disposé en contact avec la deuxième face radiale interne 22b de la portion radiale 22 et avec le chemin de roulement rapporté 24, est décalé radialement par rapport à l ' épaulement 22c de la portion radiale 22. Le chemin de roulement rapporté 24 est en contact avec l ' anneau élastique 8 par une portion de surface 24a du fil 24 inclinée par rapport à un plan radial . La portion de surface 24a est décalée axialement vers l'extérieur par rapport aux éléments roulants 6 et radialement vers l'intérieur par rapport à l ' alésage 21a de la portion axiale 21. L' anneau élastique 8 agit par contraction et non par expansion pour exercer une précontrainte sur le chemin de roulement rapporté 24. Sur la figure 4, les références des éléments semblables à ceux de la figure 3 ont été conservées. Les chemins de roulement 26 et 27 remplaçant les chemins de roulements rapportés 24 et 25 sont annulaires. Leurs sections, par un plan passant par l'axe du roulement, présentent des évidements 28 et 29 en arc de cercle sensiblement égal au rayon des éléments roulants 6, disposés du côté intérieur des chemins de roulement 26 et 27. L' anneau élastique 8 est disposé en contact avec la deuxième face radiale interne 22b de la portion radiale 22 et avec la surface d' appui 30. Sur la figure 5, les références des éléments semblables à ceux de la figure 3 ont été conservées. La bague intérieure 2 est symétrique par rapport à un plan radial passant par le centre des éléments roulants 6. La bague intérieure 2 comporte une enveloppe intérieure 20 de forme annulaire à section générale en U avec une portion axiale 21 et deux portions radiales 22 et 23 symétriques. Entre les portions radiales 22 et 23 et autour de la portion axiale 21 , sont disposés deux chemins de roulement 24 et 25 et deux anneaux élastiques 8 et 31. Le chemin de roulement 25 est disposé en contact avec la surface extérieure 21 a de la portion axiale 21 et avec la première face radiale interne 23a de la portion radiale 23. L'anneau 31 est disposé en contact avec la deuxième face radiale interne 23b de la portion radiale 23 et avec le chemin de roulement 25 et est décalé radialement par rapport à l ' épaulement 23c de la portion radiale 23. Les anneaux 8 et 31 élastiques exercent des efforts, par l'intermédiaire des chemins de roulement 24 et 25, sur la rangée d' éléments roulants 6, de chaque côté d'un plan radial passant par le centre des éléments roulants 6. et permettent ainsi de rattraper les jeux internes existant dans le roulement 1 en exerçant un effort de précontrainte plus important que dans les modes de réalisation précédents. Quel que soit le mode de réalisation de l'invention, le roulement obtenu est particulièrement simple, économique et rigide. Le roulement est capable de fonctionner sans jeu après sa fabrication et présente une très grande stabilité dans le temps des caractéristiques de précontrainte interne. The invention relates to the field of rolling bearings, in particular for steering columns. In this type of application, the bearing preferably operates with zero play so that the driver does not feel unpleasant and disturbing sensations at the steering wheel. Document FR-A-2 829 536 discloses a bearing comprising an outer ring and an inner ring, U-shaped, comprising four treated steel wires mounted in contact with the rings, a row of balls arranged in contact with the wires which constitute the raceways, and an elastic element mounted axially between a radial portion of the outer ring and one of the wires. The wires are in the form of annular rods whose ends come end to end when they are in place. The elastic element is a washer with a radial portion in contact with a radial portion of the outer ring and an axial portion in contact with an axial portion of the outer ring. To mount such a bearing, a unit comprising the inner ring is formed, the wires, the balls and the elastic element. Then, this unit is mounted in an outer ring with an L-shaped section, before the formation of one of the radial portions which is also in the form of an axial extension, then the said axial extension is folded to form said radial portion. This produces a bearing with four contact points capable of operating both under axial load as well as under radial load or under combined load. Such bearings are frequently used in steering columns which accommodate bearings whose dimensional and functional precision does not need to be very high. So that the bearing can operate without play with a calibrated preload, there is therefore a preload element between one of the radial portions of the outer ring and the corresponding wire which exerts a prestressing force between the balls and the wires on the one hand, between the wires and the envelopes on the other hand, thus making up for any residual play between these elements. However, such types of bearings with four contact points per wire have certain drawbacks. On the one hand, they comprise an elastic prestressing element which must be put in place before the crimping operation of the outer ring, which requires a manufacturing process different from that used to produce bearings having no prestressing element. . On the other hand, the price of this elastic element is relatively high. The present invention therefore aims to resolve these drawbacks by proposing a bearing comprising an elastic element, making it possible to free itself from specific manufacturing constraints, and being more economical. To this end, the rolling device with added tracks, according to one aspect of the invention, comprises an outer ring, an inner ring and at least one row of rolling elements arranged between the rings, at least one of said rings comprising an envelope. and two added annular raceways arranged in the envelope and in contact with said envelope. The bearing comprises at least one radially elastic ring, coming to bear between a radial portion of the casing and one of the added raceways, and exerting on said added raceway a force comprising an axial component and a radial component, the radial component being directed towards an axial portion of the envelope. The elastic ring can advantageously be opened at a point on its circumference. Such a bearing has the advantage of being able to be manufactured by the same automated production line as that used for the manufacture of bearings not comprising a ring. Indeed, having a cross section of diameter smaller than the space existing between the outer ring and the inner ring and thanks to its elastic properties, the ring can be mounted once the operations of bearing assembly are complete. It only requires providing downstream of the production chain, a machine capable of shrinking the ring and introducing it inside the bearing. The elastic ring, once released, tends to resume its initial shape and comes to bear between the radial portion of the envelope and the corresponding added raceway. Such a bearing also makes it possible to generate a limited manufacturing cost. In fact, in addition to not generating any additional cost relating to a production chain specific to this type of bearing, the cost of the elastic element is particularly reduced compared to the cost of the elements used in the devices of the prior art. . The elastic ring exerts a permanent force on the first race comprising an axial component and a radial component. The axial component of the force exerted on the first added raceway makes it possible to prestress the row of rolling elements against surfaces of the inner ring forming raceways and against the second reported raceway. The axial component of the force exerted by the elastic ring, in combination with an assembly of the added raceways, each in contact with a radial portion of the envelope of the bearing, allows a correction of the internal axial clearances existing in the bearing after its manufacture between the rolling elements and the added raceways and between the added raceways and the radial portions of the enclosure. The radial component of the force exerted on the first added raceway makes it possible to push said added raceway towards the axial portion of the outer casing in order to maintain zero radial clearance in the bearing. The force exerted by the ring can therefore make it possible to make up for the axial internal clearances existing in the bearing after its manufacture between the rolling elements and the added raceways and between the added raceways and the portions radial of the enclosure, but also to make up for the internal radial clearances between the added raceways and the axial portion of the enclosure. In addition, the internal clearances of the bearing, radial or axial, due to wear at the level of the contact surfaces between the rolling elements and the raceways during operation, are also taken up during operation of the bearing, which avoids harmful sensations for the user of such a bearing, in particular when the bearing is mounted on a shaft of a steering column. Advantageously, the added raceway is in contact with the elastic ring on a surface portion of the added raceway inclined relative to a radial plane. In one embodiment, the elastic ring has a section of diameter smaller than the diameter of the section of a wire forming an attached raceway. Such a ring has the advantage of being able to be placed in the outer ring of the bearing without interfering with the row of rolling elements and of not significantly increasing the axial size of the bearing. In one embodiment, the elastic ring and the added raceway bear against the same internal radial face of one of the radial portions. Such an embodiment makes it possible not to modify the axial size of the bearing. In another embodiment, one of the radial portions comprises a first internal radial face on which the added raceway bears and a second internal radial face offset towards the outside and radially towards the inside with respect to the first radial face internal on which the elastic ring is supported. Advantageously, the elastic ring is offset radially inwards relative to a shoulder of the radial portion. The elastic ring is only in contact with the added raceway and the radial portion of the envelope, it certainly exerts a prestressing force having an axial component and a radial component in order to be able to make up for the different types of play in the bearing, either before its manufacture or during use. In one embodiment of the invention, the elastic ring is arranged in the outer ring. The outer ring can comprise a groove with a V-shaped cross section with two substantially frustoconical surfaces each forming a raceway. In another embodiment of the invention, the elastic ring is arranged in the inner ring. In one embodiment of the invention, at least one added raceway has a circular section. In another embodiment of the invention, at least one added raceway has a cross section comprising a concave part forming a raceway. In one embodiment of the invention, the added raceway is circumferentially continuous or discontinuous. The invention also relates to a steering column comprising a shaft and two bearings mounted on the shaft. At least one of the bearings comprises an outer ring, an inner ring and at least one row of rolling elements arranged between the rings, at least one of said rings comprising an envelope and two added annular raceways arranged in the envelope and at contact with said casing, said bearing comprising at least one radially elastic ring coming to bear between a radial portion of the casing and one of the added raceways, and exerting on said added raceway a force comprising an axial component and a radial component, the radial component being directed towards an axial portion of the envelope. The invention finally relates to a method of manufacturing a rolling device in which a sub-assembly is mounted comprising a ring and rolling elements, a first rolling path is placed against a radial portion of an envelope, said said is placed sub-assembly in said envelope so that the rolling elements are in contact with the raceway, there is a second raceway in the envelope in contact with the rolling elements, the envelope is crimped and at least one elastic ring is introduced into the bearing after the crimping operation, said elastic element being mounted in abutment between the radial portion and one of the added raceways. Advantageously, the elastic ring is introduced in abutment against a second internal radial face of the radial portion of the envelope, offset axially towards the outside and radially towards the inside with respect to a first internal radial face of the radial portion of the enclosure on which the corresponding raceway is supported. The bearing is capable of operating, both under radial load, under axial load, or under combined load without play after its manufacture and also during its use. In addition, the bearing is particularly simple, economical, rigid. It also has the advantage of being able to be obtained by inserting the elastic element in an already manufactured bearing. The present invention will be better understood on studying the detailed description of an embodiment taken by way of nonlimiting example and illustrated by the appended drawings, in which: - Figure 1 is a half-view in axial section a rolling bearing according to a first embodiment of the invention; FIG. 2 is a half view in axial section of a rolling bearing according to a second embodiment of the invention; FIG. 3 is a half view in axial section of a rolling bearing according to a third embodiment of the invention; and FIG. 4 is a half view in axial section of a rolling bearing according to a fourth embodiment of the invention. - Figure 5 is a half view in axial section of a rolling bearing according to a fifth embodiment of the invention. As can be seen in Figure 1, the bearing 1 comprises an inner ring 2, an outer ring 3, two paths of bearing 4 and 5 added in the form of wires, a row of rolling elements 6, a cage 7 and an elastic ring 8. The inner ring 2 is of massive type. The term “solid type ring” is understood to mean a ring whose shape is obtained by machining with chip removal (turning, grinding) from tubes, bars, forged and / or rolled blanks. The inner ring 2 comprises a bore 2a of cylindrical shape delimited by radial front surfaces 2b and 2c, and an outer cylindrical surface 2d from which is formed a circular groove 9 of V section, that is to say having two substantially frustoconical surfaces 9a and 9b symmetrical on either side of a radial plane passing through the center of the rolling elements, with connection fillets. The frustoconical surfaces 9a and 9b form raceways on which the row of rolling elements 6 move. The rolling elements 6 are produced by balls. The outer ring 3 comprises an outer casing 10 of annular shape with a general U-shaped section, with an axial portion 11, a radial portion 12 and a radial portion 13. The radial portion 12 has a thickness less than the thickness of the axial portion 11 and the radial portion 13 and a length, in the radial direction, less than the length of the radial portion 13. In other words, the space separating the radial portion 12 from the outer cylindrical surface 2d is greater than that separating the radial portion 13 from the outer cylindrical surface 2d. The radial portion 13 has a first inner radial face 13a, connecting to the bore l ia of the axial portion 11, and to a second inner radial face 13b, offset axially outward and radially inward relative to the first inner radial face 13a, by a shoulder 13c. In other words, the diameter of the bore l ia is greater than the diameter of the shoulder 13c. The added raceways 4 and 5 are in the form of annular rods, the ends of which come end to end and are arranged in the outer casing 10 in direct contact therewith. The added raceways 4 and 5 are formed at from rolled wires, the ends of which come end to end when the rods are placed in the outer casing 10. The raceway 4 is placed in contact with the bore l ia of axial portion 11 and with the first radial face internal 13a of the radial portion 13. The raceway 5 is disposed in contact with the bore l ia of axial portion 11 and with an internal radial face 12a of the radial wall 12. The rolling elements 6, here balls, are disposed between the raceways 4 and 5 of the outer ring 3, and the frustoconical surfaces 9a and 9b forming the raceways of the inner ring 2. A bearing is thus produced with four contact points. The cage 7 comprises an annular portion 7a disposed, on the side of the radial portion 12, radially between the free end of the radial portion 12 and the cylindrical surface 2d of the inner ring 2, and cells 7b housing the rolling elements 6. The cage 7 thus maintains the rolling elements 6 at regular circumferential spacing. The elastic ring 8 is in the form of an open torus at a point on its circumference and is placed in contact with the second internal radial face 13b of the radial portion 13 and with the raceway 4. The elastic ring 8 has a diameter less than the diameter of the section of the wire forming the raceway 4, and is offset radially inwards relative to the shoulder 13c of the radial portion 13. The raceway 4 is in contact with the ring 8 on a surface portion 4a of the raceway 4, inclined relative to a radial plane. The surface portion 4a is offset axially outward relative to the rolling elements 6 and radially inwardly relative to the bore l ia of the axial portion 11. At the points of contact between the elastic ring 8 and the added raceway 4, the elastic ring 8 exerts a permanent prestressing force on the added raceway 4, in a direction perpendicular to the tangent common to the two profiles, said force comprising an axial component and a radial component. By the axial component of the force exerted, the elastic ring 8 tends, by means of the added raceway 4, to push back and prestress the row of rolling elements 6 on the second added raceway 5 but also on the frustoconical surfaces 9a and 9b of the ring interior 2. By the radial component of the force exerted, the elastic ring 8 tends to push back the added raceway 4 towards the axial portion 11 of the external envelope 10. The elastic ring 8 therefore makes it possible to have a bearing 1 having axial play and zero radial play. The inner ring 2 can be made for example from 100 C6 steel hardened to the core and the wires 4 and 5 can be made from pretreated steel of the "piano cord" type. The combination of the raceways 4 and 5 in the form of wires, on the one hand, and on the massive inner ring 2, on the other hand, makes it possible to reduce wear on the contact surfaces with the rolling elements 6 However, even if wear occurs, thanks to its elastic properties, the elastic ring 8 significantly catches the axial and radial play hold. The same applies if the bearing 1 is fitted on a shaft or in a housing with high tightening. In this case, the elastic ring 8 makes it possible to maintain a permanent prestress in the bearing 1 but avoids an excessive increase in this internal prestress under the effect of a tight fitting. The prestressing ring 8 therefore plays a role of generator and regulator of prestressing. The elastic ring 8 is disposed inside the outer casing 10 at a second internal radial face 13b of the radial portion 13 offset radially relative to a first internal radial face 13a. The elastic ring 8 has a section of diameter less than the diameter of the section of the wires forming the raceways 4 and 5, so that the shoulder 13c of the radial portion 13 of the casing 10 is of restricted axial dimension. The axial size of the bearing 1 is thus almost identical to that of a bearing not having an elastic prestressing member. Of course, this embodiment is in no way limiting, it is conceivable to have the added raceway 4 and the elastic ring 8 on the same internal radial face of the outer casing 10. This arrangement may have the advantage of not affecting the axial size of the bearing 1. Of course in this embodiment, the elastic ring 8 is dimensioned so as to remain spaced from the row of rolling elements 6. In FIG. 1, is illustrated in dotted lines the positioning of the radial portion 12 before the crimping operation making it possible to complete the mounting of the bearing 1. The casing outer 10 of the bearing then has an L-shaped section which is in the form of a radial extension situated in the extension of the axial portion 11. In order to assemble a bearing 1, a sub- assembly constituted by the inner ring 2, the rolling elements 6 and the cage 7. There is the first added raceway 4 against the first radial face 13a of the radial portion 13 of the envelope exterior 10, the above-mentioned sub-assembly is then placed in the exterior envelope 10 so that the rolling elements 6 are in contact with the added raceway 4 and the second added raceway 5 is placed in the exterior envelope 10 in contact with the rolling elements 6. The extension of the axial portion 11 is folded on the last added running track 5 put in place, to give it a radial shape and thus obtain an outer casing 10 having a general cross section U. The radial portion 12 has a thickness less than the thickness of the axial portion 11 and of the radial portion 13, so that it can be folded easily. Once the crimping operation is completed, the elastic ring 8 is constricted so as to introduce it between the inner ring 2 and the casing 10 on the side opposite the cage 7. The elastic ring 8 resumes its shape by elasticity and bears on the second internal face 13b of the radial portion 13 and on the added raceway 4. Compared with the devices of the prior art, this rolling device has advantages in terms of assembly plan, it is possible to use common means for example the same chain automated production for bearings which may or may not include elastic rings to compensate for the internal clearances of the bearing. Indeed, the elastic prestressing ring being inserted after the manufacture of the bearing, it is possible to use the same production means until the crimping operation for bearings comprising or not comprising prestressing elements. It also becomes possible to produce an entire stock of identical bearings without first knowing whether or not the bearings will be fitted with an elastic element when they are sold, thus making it possible not to lose time to change series and to simplify management. different production units within a manufacturing site. In FIG. 2, the references of the elements similar to those of FIG. 1 have been preserved. Reported raceways 14 and 15 replacing the raceways 4 and 5 are in the form of circumferentially continuous rings. Their sections, passing through the axis of the bearing, have recesses 16 and 17 in an arc of a circle of radius substantially equal to the radius of the rolling elements 6, arranged on the inside of the added raceways 14 and 15 and bearing surfaces. 18 and 19, arranged on the outside of the added raceways 14 and 15. The elastic ring 8 is disposed in contact with the second internal radial face 13b of the radial portion 13 and with the bearing surface 18. The tracks bearing reported in the form of rings 14 and 15 can advantageously be produced by a machining method, for example by turning. It is thus possible to produce added raceways 14 and 15 economically and simply. Of course, the transverse profile of the section of the added raceways 14 and 15 is in no way limiting, with a method of obtaining by machining different shapes are possible, in particular at the level of the surface opposite to the rolling elements 6 on which the elastic ring 8 comes into contact. He can be advantageous for example to obtain an added raceway 14 having a cross section having a bevelled part forming the surface contact portion with the elastic ring 8 and joining a concave part forming a raceway. Thanks to the beveled profile, it is thus possible to obtain a radial portion 13 of the outer casing 10 having a single radial face on which the added raceway 14 and the elastic ring 8 come into contact. The axial size of the bearing 1 is thus affected by the elastic ring 8 only negligibly. It may also be advantageous to provide, with respect to the shape of the added raceway 14 as shown in Figure 2, to provide a recess extending axially towards the rolling elements 6 and having a length substantially equal to the diameter of the elastic ring 8 in order to reduce the axial size of the bearing 1, at the level of the portion of contact with the elastic ring 8 and the attached raceway 14. It may also be possible to produce easily thanks to the mode of 'Obtaining by machining, the raceways 14 and 15 symmetrical with respect to a radial plane passing through the center of their section. The added raceways 14 and 15 are thus identical, which reduces the number of different parts inside the bearing 1 and makes it possible to mount the raceways 14 and 15 without prior orientation, which simplifies the automated chain producing the making. In FIG. 3, the references of the elements similar to those of FIGS. 1 and 2 have been preserved. The bearing 1 has an inner ring 2 and an outer ring 3 different from that described in the previous embodiments. The radial portion 13 of the outer casing 10 of the outer ring 3 has a single inner face 13a. The inner ring 2 comprises an inner envelope 20 of annular shape with a general U-shaped section, with an axial portion 21, a radial portion 22 and a radial portion 23. The radial portion 23 has a length, in the radial direction, less than the length of the radial portion 22. The radial portion 22 has a first internal radial face 22a, connecting to an external surface 21a of the axial portion 21 and to a second internal radial face 22b, offset axially towards the outside and radially towards the inside relative to the first internal radial face 22a, by a shoulder 22c. The added raceways 24 and 25 of the same type as the added raceways 4 and 5 are also in the form of wires. The added raceway 24 is disposed in contact with the outer surface 21a of the axial portion 21 and with the first internal radial face 22a of the radial portion 22. The added raceway 25 is disposed in contact with the outer surface 21a of the axial portion 21 and with the first internal radial face 22a of the radial wall 22. The elastic ring 8, disposed in contact with the second internal radial face 22b of the radial portion 22 and with the added raceway 24, is offset radially with respect to the shoulder 22c of the radial portion 22. The added raceway 24 is in contact with the elastic ring 8 by a surface portion 24a of the wire 24 inclined with respect to a radial plane. The surface portion 24a is offset axially outward with respect to the rolling elements 6 and radially inward with respect to the bore 21a of the axial portion 21. The elastic ring 8 acts by contraction and not by expansion for exert a prestress on the added raceway 24. In FIG. 4, the references of the elements similar to those of FIG. 3 have been preserved. The raceways 26 and 27 replacing the added raceways 24 and 25 are annular. Their sections, by a plane passing through the axis of the bearing, have recesses 28 and 29 in an arc of a circle substantially equal to the radius of the rolling elements 6, arranged on the inside of the raceways 26 and 27. The elastic ring 8 is placed in contact with the second internal radial face 22b of the radial portion 22 and with the bearing surface 30. In FIG. 5, the references of the elements similar to those of FIG. 3 have been preserved. The inner ring 2 is symmetrical relative to a radial plane passing through the center of the rolling elements 6. The inner ring 2 comprises an inner envelope 20 of annular shape with a general U-shaped section with an axial portion 21 and two radial portions 22 and 23 symmetrical. Between the radial portions 22 and 23 and around the axial portion 21 are arranged two raceways 24 and 25 and two elastic rings 8 and 31. The raceway 25 is arranged in contact with the outer surface 21 a of the portion axial 21 and with the first internal radial face 23a of the radial portion 23. The ring 31 is disposed in contact with the second internal radial face 23b of the radial portion 23 and with the raceway 25 and is offset radially with respect to the shoulder 23c of the radial portion 23. The elastic rings 8 and 31 exert forces, via the raceways 24 and 25, on the row of rolling elements 6, on each side of a passing radial plane by the center of the rolling elements 6. and thus make it possible to make up for the internal clearances existing in the bearing 1 by exerting a greater prestressing force than in the previous embodiments. Whatever the embodiment of the invention, the bearing obtained is particularly simple, economical and rigid. The bearing is capable of operating without play after its manufacture and has a very high stability over time of the internal prestressing characteristics.

Claims

REVENDICATIONS
1. Dispositif de roulement (1) à pistes rapportées comprenant une bague extérieure (3), une bague intérieure (2) et au moins une rangée d' éléments roulants (6) disposés entre les bagues, au moins une desdites bagues (3) comprenant une enveloppe (10) et deux chemins de roulement annulaires rapportés (4, 5) disposés dans l'enveloppe et au contact de ladite enveloppe (10), caractérisé par le fait qu' il comprend au moins un anneau (8) radialement élastique, venant en appui entre une portion radiale (13) de l' enveloppe (10) et l' un des chemins de roulement rapportés (4), et exerçant sur ledit chemin de roulement rapporté (4) un effort comprenant une composante axiale et une composante radiale, la composante radiale étant dirigée en direction d'une portion axiale (11) de l'enveloppe. 1. Rolling device (1) with attached tracks comprising an outer ring (3), an inner ring (2) and at least one row of rolling elements (6) arranged between the rings, at least one of said rings (3) comprising an envelope (10) and two added annular raceways (4, 5) arranged in the envelope and in contact with said envelope (10), characterized in that it comprises at least one radially elastic ring (8) , coming to bear between a radial portion (13) of the casing (10) and one of the added raceways (4), and exerting on said added raceway (4) a force comprising an axial component and a radial component, the radial component being directed towards an axial portion (11) of the envelope.
2. Dispositif selon la revendication 1, caractérisé par le fait que l' anneau (8) est ouvert en un point de sa circonférence. 2. Device according to claim 1, characterized in that the ring (8) is open at a point on its circumference.
3. Dispositif selon les revendications 1 ou 2, caractérisé par le fait que le chemin de roulement rapporté (4) est en contact avec l ' anneau élastique (8) sur une portion de surface (4a) du chemin de roulement rapporté (4) inclinée par rapport à un plan radial . 3. Device according to claims 1 or 2, characterized in that the added raceway (4) is in contact with the elastic ring (8) on a surface portion (4a) of the raceway added (4) inclined with respect to a radial plane.
4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que l' anneau élastique (8) a une section de diamètre inférieur au diamètre de la section d'un fil formant un chemin de roulement rapporté (4, 5). 4. Device according to any one of the preceding claims, characterized in that the elastic ring (8) has a section of diameter less than the diameter of the section of a wire forming an attached raceway (4, 5) .
5. Dispositif selon l' une quelconque des revendications précédentes, caractérisé par le fait que l' anneau élastique (8) et le chemin de roulement rapporté (4) sont en appui contre une même face radiale interne d'une des portions radiales ( 13). 5. Device according to any one of the preceding claims, characterized in that the elastic ring (8) and the added raceway (4) bear against the same internal radial face of one of the radial portions (13 ).
6. Dispositif selon l' une quelconque des revendications précédentes, caractérisé par le fait qu'une des portions radiales (13) comprend une première face radiale interne (13a) sur laquelle le chemin de roulement rapporté (4) prend appui et une deuxième face radiale interne (13b), décalée axialement vers l'extérieur et radialement vers l'intérieur par rapport à la première face radiale interne (13a), sur laquelle l' anneau élastique (8) prend appui. 6. Device according to any one of the preceding claims, characterized in that one of the radial portions (13) comprises a first internal radial face (13a) on which the added raceway (4) is supported and a second face internal radial (13b), axially offset towards the outside and radially inwards with respect to the first internal radial face (13a), on which the elastic ring (8) is supported.
7. Dispositif selon la revendication 6, caractérisé par le fait que l' anneau élastique (8) est décalé radialement vers l'intérieur par rapport à un epaulement (13c) de la portion radiale (13). 7. Device according to claim 6, characterized in that the elastic ring (8) is offset radially inwards relative to a shoulder (13c) of the radial portion (13).
8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que l'anneau élastique (8) est disposé dans la bague extérieure (3). 8. Device according to any one of the preceding claims, characterized in that the elastic ring (8) is arranged in the outer ring (3).
9. Dispositif selon la revendication 8, caractérisé par le fait que la bague intérieure (2) comprend une gorge à section droite en V avec deux surfaces sensiblement tronconiques (9a, 9b) formant chacune une piste de roulement. 9. Device according to claim 8, characterized in that the inner ring (2) comprises a groove with a V-shaped cross section with two substantially frustoconical surfaces (9a, 9b) each forming a raceway.
10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que l' anneau élastique (8) est disposé dans la bague intérieure (2). 10. Device according to any one of the preceding claims, characterized in that the elastic ring (8) is arranged in the inner ring (2).
11. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait qu' au moins un chemin de roulement rapporté (4, 5) présente une section circulaire. 11. Device according to any one of the preceding claims, characterized in that at least one added raceway (4, 5) has a circular section.
12. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait qu' au moins un chemin de roulement rapporté (14, 15) présente une section transversale comprenant une partie concave (16) formant une piste de roulement. 12. Device according to any one of the preceding claims, characterized in that at least one added raceway (14, 15) has a cross section comprising a concave part (16) forming a raceway.
13. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que le chemin de roulement rapporté (4, 5) est circonférentiellement continu ou discontinu. 13. Device according to any one of the preceding claims, characterized in that the added raceway (4, 5) is circumferentially continuous or discontinuous.
14. Colonne de direction comprenant un arbre et deux roulements montés sur l' arbre, caractérisé par, le fait qu' au moins l' un des roulements comprend une bague extérieure (3), une bague intérieure (2) et au moins une rangée d' éléments roulants (6) disposés entre les bagues, au moins une desdites bagues (3) comprenant une enveloppe (10) et deux chemins de roulement annulaires rapportés (4, 5) disposés dans l' enveloppe (10) et au contact de ladite enveloppe (10), ledit roulement comprenant au moins un anneau (8) radialement élastique, venant en appui entre une portion radiale (13) de l ' enveloppe (10) et l 'un des chemins de roulement rapportés (4) , et exerçant sur ledit chemin de roulement rapporté (4) un effort comprenant une composante axiale et une composante radiale, la composante radiale étant dirigée en direction d'une portion axiale (1 1) de l' enveloppe. 14. Steering column comprising a shaft and two bearings mounted on the shaft, characterized by the fact that at least one of the bearings comprises an outer ring (3), an inner ring (2) and at least one row rolling elements (6) arranged between the rings, at least one of said rings (3) comprising a casing (10) and two added annular raceways (4, 5) arranged in the casing (10) and in contact with said casing (10), said bearing comprising at least one radially elastic ring (8), coming to bear between a radial portion (13) of the casing (10) and one of the added raceways (4), and exerting on said added raceway (4) a force comprising an axial component and a radial component, the radial component being directed in the direction of an axial portion (1 1) of the envelope.
15. Procédé de fabrication d' un dispositif de roulement (1) à pistes rapportées dans lequel on monte un sous-ensemble comprenant une bague (2) et des éléments roulants (6), on place un premier chemin de roulement (4) contre une portion radiale (13) d' une enveloppe (10), on place ledit sous-ensemble dans ladite enveloppe (10) de façon que les éléments roulants (6) soient en contact avec le chemin de roulement rapporté (4), on dispose un deuxième chemin de roulement rapporté (5) dans l'enveloppe (10) au contact des éléments roulants (6) , on effectue une opération de sertissage de l' enveloppe (10), caractérisé par le fait qu' on introduit au moins un anneau (8) élastique dans le roulement après l' opération de sertissage, ledit élément élastique étant monté en appui entre la portion radiale ( 13) et l'un des chemins de roulement rapportés (4). 15. Method of manufacturing a rolling device (1) with attached tracks in which a sub-assembly is mounted comprising a ring (2) and rolling elements (6), a first raceway (4) is placed against a radial portion (13) of a casing (10), said sub-assembly is placed in said casing (10) so that the rolling elements (6) are in contact with the added raceway (4), there is a second added raceway (5) in the envelope (10) in contact with the rolling elements (6), a crimping operation of the envelope (10) is carried out, characterized in that at least one is introduced elastic ring (8) in the bearing after the crimping operation, said elastic element being mounted in abutment between the radial portion (13) and one of the added raceways (4).
16. Procédé de fabrication d'un dispositif de roulement ( 1) selon la revendication 14, caractérisé par le fait qu'on introduit l' anneau (8) élastique contre une deuxième face radiale interne (13b) de la portion radiale (13) de l' enveloppe (10) décalée axialement vers l ' extérieur et radialement vers l'intérieur par rapport à une première face radiale interne (13a) de la portion radiale (13) de l' enveloppe ( 10) sur laquelle le chemin de roulement rapporté (4) est en appui. 16. A method of manufacturing a rolling device (1) according to claim 14, characterized in that one introduces the ring (8) elastic against a second internal radial face (13b) of the radial portion (13) of the casing (10) offset axially outward and radially inward relative to a first internal radial face (13a) of the radial portion (13) of the casing (10) on which the raceway reported (4) is in support.
PCT/FR2004/002516 2003-10-27 2004-10-06 Anti-friction bearing, especially for a steering column WO2005050039A1 (en)

Priority Applications (2)

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EP04791471A EP1678426A1 (en) 2003-10-27 2004-10-06 Anti-friction bearing, especially for a steering column
JP2006537341A JP2007510114A (en) 2003-10-27 2004-10-06 Rolling element bearing and steering column having the same

Applications Claiming Priority (2)

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FR0312559 2003-10-27
FR0312559A FR2861441B1 (en) 2003-10-27 2003-10-27 BEARING BEARING, IN PARTICULAR FOR STEERING COLUMN

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GB1007191A (en) * 1963-01-09 1965-10-13 Autoset Production Ltd Improvements relating to bearings
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US2023718A (en) * 1930-10-10 1935-12-10 Mathews Conveyer Co Antifriction bearing
US2588636A (en) * 1949-06-28 1952-03-11 Crise Mfg Company Noiseless self-aligning ball bearing
GB1007191A (en) * 1963-01-09 1965-10-13 Autoset Production Ltd Improvements relating to bearings
FR1565657A (en) * 1968-03-21 1969-05-02
US6158896A (en) * 1998-02-21 2000-12-12 Ina Walzlager Schaeffler Ohg Play-free radial ball bearing

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FR2861441A1 (en) 2005-04-29
EP1678426A1 (en) 2006-07-12
FR2861441B1 (en) 2007-01-26
JP2007510114A (en) 2007-04-19

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