WO2009095101A2

WO2009095101A2 - Clutch release bearing device

Info

Publication number: WO2009095101A2
Application number: PCT/EP2008/065206
Authority: WO
Inventors: Steffen Dittmer; Bernhard KLÖPFER; Ludwig Winkelmann
Original assignee: Schaeffler Kg
Priority date: 2008-01-30
Filing date: 2008-11-10
Publication date: 2009-08-06
Also published as: WO2009095101A3; DE102008006656A1

Abstract

The invention relates to a clutch release bearing device having a first race, a second race, rolling elements contained in a raceway defined between the two races, and a cage device for guiding the rolling elements within the above raceway. The aim of the invention is to demonstrate solutions by which it is possible to create a clutch release bearing device that can be produced at low cost, and that features low sensitivity to moisture and dusts. Said aim is achieved according to the invention by a clutch release bearing device having a first bearing race having a first rolling element bearing surface area, a second bearing race constituting the bearing race rotating about a bearing axis and forming a second rolling element bearing surface area, the second bearing race and the first bearing race overlapping one another in the axial direction, and the second bearing race thereby externally encompassing the first bearing race, and a ring wall drawn radially inward under the radial level of the first rolling element race surface area being formed both on the first bearing race and on the second bearing race, rolling elements contained in a raceway defined between the first bearing race and the second bearing race, a cage device for guiding the rolling elements within the raceway, and a seal device for preventing the entry of impurities to the raceway through a potential penetration area defined between the two ring walls, said clutch release bearing device being characterized in that the seal device comprises a cover ring element descending into a sealing zone, wherein the cover ring element is integrated in the clutch release bearing device such that the cross section of a potential particle penetration path between the two ring walls is reduced, and the second ring wall formed by the second bearing race rotates relative to the cover ring element.

Description

Name of the invention

clutch release

description

Field of the invention

The invention relates to a clutch release bearing device having a first race, a second race, rolling elements which are received in a defined between the two raceways track space, and a cage device for guiding the rolling elements within said track space. In particular, the invention relates to a clutch release bearing device which withstands high running loads even under unfavorable environmental conditions, especially in dusty environments.

Background of the invention

From DE 6 96 18 149 T2 a clutch release bearing device of the aforementioned type is known in which in a formed by the outer race inner corner region, a sealing ring is attached, which is provided with an elastomeric sealing lip. This sealing lip bears against a running surface provided by the inner bearing race and thus seals the rolling bearing interior on one side. Object of the invention

The invention has for its object to provide solutions by which it is possible to create a clutch release bearing device which is inexpensive to produce, and is characterized by a high insensitivity to moisture and dust.

Inventive solution

This object is achieved according to the invention by a clutch release bearing device with:

a first bearing race with a first rolling body tread area,

a second bearing race which represents the bearing race rotating about a bearing axis and which forms a second rolling body tread area,

- Wherein the second bearing race and the first bearing race overlap each other in the axial direction and the second bearing race in this case surrounds the first bearing race on the outside, and

in each case a ring wall drawn in radially inwardly below the radial level of the first rolling body surface area is formed both on the first bearing race and on the second bearing race,

Rolling elements which are accommodated in a path space defined between the first bearing race and the second bearing race,

- A cage means for guiding the rolling elements within the track space, and

a sealing device for suppressing the access of contaminants to the web space via a potential passage region defined between the two annular walls, wherein this coupling release bearing device is characterized in that the sealing device has a cover ring element which dips into a sealing zone, wherein the cover ring element in such a way in the clutch release bearing device it is integrated that this cut a potential particle passageway between the two annular walls is reduced and also rotates the second annular wall formed by the second bearing race relative to the Abdeckringelement.

This advantageously makes it possible to provide a clutch release bearing device in which the sealing zone is formed by a structure which is mounted in a substantially stationary manner and brought to the rotating bearing race. This concept makes it possible, in the area of the sealing zone, i. create conditions in the potential dirt passage area, by which a passage of contaminants through this sealing zone can be prevented in a surprisingly effective manner.

According to a particularly preferred embodiment of the invention, the clutch release bearing device is designed such that the sealing zone extends between the cover ring element and the second annular wall. Structures, in particular conveyor thread grooves, can be formed both on the cover ring element and on the second annular wall adjoining the cover ring element and, in the case of a designated direction of rotation of the second bearing race, tend to counteract the passage of any contaminants through the sealing zone.

According to a particularly preferred embodiment of the invention, the cover ring element is designed in such a way that it comprises a sheet-metal ring which acts as a highly rigid structure and is preferably manufactured by deep-drawing deformation. This sheet metal ring can be designed so that it is brought so close to the annular wall of the second, circumferential bearing race that access of impurities is already at least largely prevented by the case realized here, extremely low running gap. Furthermore, it is possible to design the cover ring element in such a way that it also comprises an elastomer structure. This elastomeric structure may be designed so that it forms at least one sliding contact sealing lip, which rests, for example, on a tread portion, which optionally directly through the second annular wall of the second bearing race is formed. It is also possible to make the elastomeric structure with respect to its torus cross-section so that it forms a plurality of sliding contact sealing lips, which bear against radially slightly spaced-apart contact zones on the annular wall.

According to a particularly preferred embodiment of the invention, the Kupplungsausrücklagereinrichtung is designed such that the cooperating with the Abdeckringelement, in particular provided by this sealing lips tread portion is formed by a Innenumfangswandung- sabschnitt the second annular wall. Alternatively, or in particular in combination with this measure, it is also possible to design the cover ring element, in particular the elastomer structure, in such a way that the running or sealing gap is formed in cooperation with an inner end face section of the second annular wall.

According to a particular aspect of the present invention, the cover ring element is connected to the first race. This makes it possible to ensure a particularly precise positioning of the opening into the sealing zone portions of the Abdeckringelementes with respect to the second annular wall and against, supported by the second bearing race structures. The cover ring element or the elastomeric structure provided by it is preferably centered by the first raceway. This centering can be done in particular by the Abdeckringelement used in an inner opening region of the first race, in particular in a bounded by the first annular wall opening or bore, in particular is pressed.

As an alternative to the aforementioned approach of anchoring the cover ring element to the first race, according to another aspect of the present invention it is also possible to connect the cover ring element to a carrier bush carrying the first race. This connection can be done in particular by using a first bearing race on the support bushing securing plate spring. This diaphragm spring allows the cover Ring element are clamped against a provided by the first annular wall of the first bearing race face. In particular, in the positioning of the Abdeckringelementes via a first race bearing structure or support bush, it is possible in an advantageous manner, the cooperating with the second bearing race, in particular by this provided second annular wall and in this case the sealing zone defining structures so that a minor , Radial displacement of the second annular wall relative to the Abdeckringelement is permitted. This radial displaceability of the second annular wall relative to the cover ring element can be made possible, in particular, by designing the cover ring element or the elastomer structure provided by the latter in such a way that it bears against an inner end face, ie a surface of the second annular wall which is essentially normal to the bearing axis.

Preferably, the sealing zone formed in the interaction of the second bearing race or the second annular wall provided by the second annular wall with the Abdeckringelement is designed so that one of any, from outside penetrating impurities to be overcome passageway from a radially outer level (large radius) to a radial further inside circumferential level (smaller radius) leads. This makes it possible to provide in the region of this passageway relative movements between the sealing zone delimiting the moving surfaces, which counteract the passage of impurities. In particular, it is also possible to entrain any impurities entering the sealing zone in the sealing zone and thereby to subject them to centrifugal or drag forces which tend to bring about the return of the impurities from the area of the release bearing to be shielded.

The above-mentioned, the invention is based task is GE measure a further aspect of the invention also solved by a Kupplungsausrück- with the features specified in claim 15 and / or 22 features. In the aforementioned embodiment according to the invention, the cover ring element is preferably anchored to the second annular wall in a form-fitting manner. This anchoring can be accomplished, in particular, via a beading area, which engages behind the second annular wall on an end face facing away from the sealing zone. The cover ring element can, as in the above-described exemplary embodiment, be designed such that it encompasses a sealing lip device made of an elastomer material. This sealing lip device can be designed such that it has a sealing lip which abuts against an end face defined by the first annular wall of the first bearing race.

The cover ring member according to a particular aspect of the present invention is designed to include a sheet metal ring core having a torus cross section with an angle profile. The incorporation of the sealing lip device into the cover ring element is preferably accomplished in such a way that the elastomer body carrying the sealing lip device sits in the inner corner region of this angle profile.

The angle profile can also be designed so that it comprises a ring leg which, while leaving a small clearance gap to the first

Ring wall of the first bearing race penetrates. This makes it possible, only by the relatively rigid structure of the Abdeckringelementes potentially for the passage of any impurities available

Reduce passage gap. In particular in combination with the aforementioned elastomeric sealing lip structure, this results in a particularly high sealing effect in the area of the potential dirt passageways.

Short description of the drawing

Further details and features of the invention will become apparent from the following description taken in conjunction with the drawings. It shows: FIG. 1 shows an axial sectional illustration for illustrating the structure of a first embodiment of a clutch release bearing according to the invention,

FIG. 1b shows a detail sketch to illustrate a particularly advantageous design of a sealing zone defined in conjunction with the covering ring element according to the invention,

FIG. 2 shows an axial sectional illustration for illustrating a second variant of a clutch release bearing device according to the invention,

FIG. 3 shows an axial sectional illustration for illustrating a third variant of a clutch release bearing device according to the invention with a multi-part cover ring element centered on the stationary bearing race,

FIG. 4 shows an axial sectional illustration for illustrating a fourth variant of a clutch release bearing device according to the invention with a cover ring element which is provided with an elastomeric sealing lip engaging in an inner opening of the second bearing race,

FIG. 5 shows an axial sectional illustration for illustrating a fifth variant of a clutch release bearing device according to the invention which is largely similar to the variant according to FIG.

6a is an axial sectional view for illustrating a variant of a release bearing device according to the invention with a positioned by a bearing support sleeve DichtAbdeckringele- element, FIG. 6b shows a further axial sectional representation for illustrating a seventh variant of a clutch release bearing device according to the invention, likewise with a sealing ring device positioned by a carrier bush,

FIG. 7 shows an axial sectional illustration for illustrating an eighth variant of a clutch release bearing device according to the invention,

FIG. 8 shows an axial sectional illustration for illustrating a ninth variant of a clutch release bearing device according to the invention,

FIG. 9 shows an axial sectional illustration for illustrating a tenth variant of a clutch release bearing device according to the invention,

10 is an axial sectional view illustrating an eleventh variant of a Kupplungsausrücklagerein- inventive device.

Detailed description of the drawings

The clutch release bearing device illustrated in FIG. 1 a comprises a first bearing race 1 with a first rolling body running surface region B1, a second bearing race 2, which represents the bearing race rotating about a bearing axis X and which forms a second rolling body raceway region B2. The first bearing race 1 and the second bearing race 2 are designed so that they overlap each other in the axial direction, wherein the second bearing race 2 in this case surrounds the first bearing race 1 on the outside.

Both on the first bearing race 1 and on the second bearing race 2 is in each case a radially inwardly below the radial level of the first Wälzkörper- Running range B1 retracted ring wall 1 a, 2 a formed. In a defined between the first bearing race 1 and the second bearing race 2 track space B rolling elements W are added. In the embodiment shown here, the Wälzköper W are designed as balls. The provided by the two bearing races 1, 2 Wälzkörperlaufflächenbereiche B1 and B2 form in conjunction with the rolling elements W an angular contact ball bearings. The rolling elements W are guided in the defined between the two bearing races 1, 2 track space B by a cage device 3, which is preferably made of a plastic material and can be designed, for example, as a ball snap cage. The clutch release bearing device is further provided with a sealing device, which as such serves to suppress the entry of impurities to the track space B via a gap defined between the two annular walls 1a, 2a.

The clutch release bearing device shown here is characterized in that the sealing device has a Abdeckringelement 4, which dips into a sealing zone D, wherein the Abdeckringelement 4 is so incorporated into the Kupplungsausrücklagereinrichtung that thereby the cross-section of a potential particle passageway between the two annular walls 1 a , 2a is reduced and also rotates the annular wall 2a formed by the second bearing race 2 relative to the Abdeckringelement 4.

In the embodiment shown here, the sealing zone D is formed directly between the Abdeckringelement and an outer peripheral surface of the second annular wall 2a. The Abdeckringelement 4 is designed as a deep-drawn sheet metal ring and the same to the first race 1, in particular to the annular wall 1 a. The cover ring element 4 is centered in this embodiment directly by the first race 1, in particular its annular wall 1 a. The cover ring element 4 is preferably made of a heat-treated and / or coated steel material and formed so that it forms a seat surface 4a, which directly on a the Abdeckringelement 4 facing end face 1 b of the annular wall 1 a seated. The cover ring element 4 is provided in its inner peripheral region with an annular web 4b, which engages under an inner peripheral surface formed by the annular wall 1 a 1 c. Through this annular web 4b, the cover ring element 4 is centered directly through the inner opening of the annular wall 1 a. Through the seat 1 b, the cover ring member 4 is positioned in the axial direction. The cover ring element 4 may be designed so that it is anchored sufficiently resiliently under sufficient pressure fit on the first bearing race 1.

In the embodiment shown here, the first bearing race 1 is guided on a support bush 5 such that the first bearing race 1 relative to the support bush 5 by a certain amount in the radial direction is displaced. The backup of the first bearing race 1 and thus the entire rolling bearing device on the support bushing 5 is achieved by a plate spring 6, which is supported on a provided by the support sleeve 5 ring edge 7, while the first bearing race 1 with the interposition of a hardened contact disk 8 to a through the Carrier socket 5 provided annular shoulder 9 spans.

Due to the fuse shown here of the first bearing race 1 on the support bushing 5, it is possible to hold on the plate spring 6 and the Abdeckringelement 4 reliably on the annular wall 1 a of the first bearing race. The annular bushing section of the cover ring element 4 penetrating into the coupling and engaging in the inner opening defined by the second annular wall 2a is brought so close to the wall of the second bearing race facing it that only an extremely small running gap remains.

As can be seen from the illustration according to Figure 1 b, it is possible to design this running gap so that it widens outward in a "cone-like manner." This makes it possible to define the potential passageway defined between the covering ring element 4 and the annular wall 2a for any impurities to be designed so that this from a radially outermost circumferential level RA to a radially inward circumferential level Rl leads. This makes it possible to create in the region of the sealing zone a Bewegflächen- system by which any entering into the passage area impurities are due to the centrifugal force tends to be conveyed back to the outside.

For the second embodiment according to FIG. 2, the preceding explanations apply to a large extent analogously. In the embodiment shown in Figure 2, the provided by the first bearing race 1 and the second bearing race 2 ring walls 1 a, 2 a are designed so that the inner circumferential openings defined by these have substantially the same inner diameter. The annular wall 2a is designed so that it forms a convex bulging, optionally kalottenringartige end face. The sealing or foreclosure of the track space B against any, to the sealing zone D penetrating impurities is achieved according to the invention by a tethered to the annular wall 1 a of the first bearing race 1 Abdeckringelement 4.

In the embodiment shown here, the Abdeckringelement 4 is designed so that this one hand supports a supported and centered on the annular wall 1 a sheet metal ring 14 and secured by this plastic ring 10. The plastic ring is secured to the sheet metal ring 4 via a crimping section 4e. The plastic ring 10 is designed such that it forms an annular wall 2a penetrating annular web 10a, which engages as such the defined by the annular wall 2a inner peripheral wall 2b similar to the embodiment of Figure 1 below. The plastic ring 10 is further configured such that it provides an inner end face 10b, which defines an annular space in which is provided for tensioning the first bearing race 1 and the annular wall 1 a provided against the support structure 5 plate spring 6. Although not shown here in detail, it is possible to additionally equip the plastic ring 10 with a sealing lip ring structure preferably made of an elastomeric material, by means of which a further sealing of the between the plastic ring 10 and the inner ring is ensured. nenfläche the second annular wall 2a remaining running gap is achieved.

FIG. 3 shows a third variant of a clutch release bearing device according to the invention, which largely corresponds in its construction to the variant according to FIG. Notwithstanding the embodiment described in conjunction with Figure 2, in this third variant, instead of the plastic ring 10 (see Figure 2), a cover ring element 10 'manufactured as a deep-drawn component is provided which, similar to the plastic ring 10 according to Figure 2, provides a seal - Donate! 10a ', which engages as such in an opening defined by the second annular wall 2a inner opening, leaving an extremely small clearance. The ring 4 provided for positioning this cover ring element 10 'is furthermore designed with regard to its cross section so that it forms additional ring structures, by means of which an additional partitioning of the web space B with respect to the surroundings of the release bearing device is achieved.

In the embodiment shown here, the Abdeckringelement 10 ', the aforementioned Axialbuchsenabschnitt / sealing leg 10a', a radial annular web portion 10b, a bridging portion 10c, an inclined back to the Abdeckringelement 4 ring back 10d and an anchoring ring web 10e. This anchoring ring web 10e is axially secured to the cover ring element / ring 4 by a passage 4e. The shield ring or the cover ring element 10 'is positioned by the ring 4 both in the axial direction and in the radial direction. The ring 4 is supported and centered on the annular wall 1 a of the first bearing ring 1 as in the embodiments described above.

In the embodiment according to FIG. 4, the covering ring element 4 is provided with a sealing lip device 40 made of an elastomer material. This sealing lip device 40 is designed in the embodiment shown here so that it forms a first sealing lip 41 and a second sealing lip 42. The first sealing lip 41 engages under one by the second Ring wall 2a of the second bearing race 2 provided Innenumfangs- wall. The second sealing lip 42 provided by the sealing lip device 40 bears against an inner end face 2s of the annular wall 2a facing the web space B. The sealing lip device 40 is made of an elastomer material and vulcanized onto a metal ring core 4 a of the cover ring element 4 designed as a deep-drawn component. The metal ring core 4a is, as in the embodiments described above, designed so that it is seated on the one hand on a provided by the first annular wall 1 a end face and also centered by a defined by the annular wall 1 a inner peripheral opening.

Also in the embodiment of Figure 4, the Abdeckringelement 4 is urged under action of the plate spring 6 against the provided by the first annular wall 1 a end face. Also in this embodiment, the first bearing race 1 relative to the support bush 5 in the radial direction is slightly displaced. The attached to the first annular wall 1 a Abdeckringelement 4 is positioned by the first bearing race 1 relative to the second bearing race 2 high precision.

The first bearing race 1 encompassing the second bearing race 2 forms on its side facing away from the annular wall 2a "clutch remote" side a second clearance with the first bearing race 1. This second clearance is sealed by a sealing device HD, which secured via an annular cap RK on the second bearing race 2 is.

For the embodiment shown in Figure 5, the comments on the embodiment of Figure 4 apply mutatis mutandis. The sealing lip device 40 is designed in this embodiment so that it provides a first sealing lip 41 and a second sealing lip 42 which are positioned by the Abdeckring- element 4. The Abdeckringelement 4 has, similar to the embodiment of Figure 4, an annular flange 4a, which is positioned both axially and radially through the annular wall 1 a of the first bearing race 1. In the embodiment according to FIG. 5, the cover ring element with the interposition of a cold-worked or heat-treated and or coated annular disc 44 by the plate spring 6 against the provided by the first annular wall 1 a end face stretched. The plate spring 6 is thus not directly adjacent to the metal ring / annular flange 4 a of the Abdeckringelementes 4. Between the cover ring member 4 facing away from the back of the annular wall 1 a and provided by the support structure 5 annular shoulder 9 is in the same manner as in the embodiment of Figure 8, made of a cold-worked or heat-treated and coated or steel material supporting disc 8 is arranged. The support disk 8 is placed on the support structure 5 such that it is not displaceable in the radial direction substantially. By this concept, a particularly favorable Axialkraftübertragung between the annular wall 1 a and the support structure 5 is achieved with the smallest possible radial space.

In the sixth exemplary embodiment according to FIG. 6 a, the cover ring element 4 provided for sealing the running gap is secured to the support structure 5. The cover ring element 4 comprises a metal ring 4a produced as a deep-drawn forming part and a sealing lip device 40 made of an elastomer material. The sealing lip device 40 forms a sealing lip 42 which rests against an inner surface provided by the annular wall 2a. The elastomer structure / sealing lip device 40 is vulcanized onto the cover ring element 4. The cover ring element 4 comprises a bushing section 4f, which as such engages under an inner opening formed by the support structure 5. This section 4f is axially secured to the carrier structure 5 via a crimping section 4e. By the concept shown here, it is also possible to shield against the access of impurities also provided for the connection of the first bearing race 1 to the support structure 5, here formed by the plate spring 6 mechanism and thus over a relatively long period of operation a sufficiently smooth radial displacement the Ringwan- fertil 1 a with respect to the support structure 5 to ensure.

In the embodiment according to FIG. 6b, a sealing of the release bearing is accomplished, wherein the bore 71 of the outer ring 72 is locked in place. Sealing lip 73 acts as a pre-seal with non-abrasive sealing lip for dirt repellency. The task of the main seal takes over the axially acting against the outer ring 2 inner sealing lip 74. A facing the inner ring sealing lip 78 is the fat retention. It can be designed in particular as a sliding seal or to minimize friction as a gap seal. The sealing ring carrier 75 with its tuned length of the cylindrical portion ensures a tight tolerance of the inner biasing force of the plate spring 76 when crimping the retaining ring 77. The seal carrier can be made of a standard material, such as DC 03.

FIG. 7 shows a further variant of a clutch release bearing device according to the invention, in which, in addition to a partitioning of the rolling element track space B from contamination, a shielding of the fixing or connecting mechanism for connecting the first bearing race 1 to the carrier structure 5 is achieved. In this embodiment, a seal of the release bearing is achieved by a radially acting and formed by the Abdeckringelement 4 labyrinth seal. In this embodiment, two deep-drawn angle rings 43, 44 are positively fixed to the circumferential outer ring 2. The standing labyrinth ring cover 45 is fixed to the flanging plate 46. Material for the sealing components is preferably C17 MV designed as a tempered and work hardened strip material. The dirt-repellent conveying effect can be improved by helical threads on the sealing surfaces of the labyrinth rings.

In applications in which a contacting seal is required or due to other environmental influences a contacting seal is required, as already indicated in connection with Figure 4, a double seal is proposed, which has a radially-acting sealing lip in the outer ring bore as the actual main seal. This main sealing lip protects the release bearing against the ingress of contaminants from the outside. The second axially acting sealing lip prevents the lubricant from escaping from the release bearing. The seal carrier is preferably made of tempered Band material produced, which has a minimum surface hardness of 400 HV and is fixed in the bore of the inner ring.

In the embodiment of a clutch release bearing device according to the invention shown in FIG. 8, the sealing device is designed such that it has a cover ring element 80 which dips into an annular gap space between the two bearing races 1, 2, wherein the cover ring element 80 is connected to the second annular wall 2 a in that the cover ring element 80 engages or passes through an inner opening defined by the second annular wall 2a.

In the embodiment shown here, the cover ring element 80 is anchored to the second annular wall 2a in a form-fitting manner. The cover ring element 80 is axially secured by a beading on the second annular wall 2a. The covering ring element 80 comprises a sealing lip device 81 made of an elastomeric material, which has a sealing lip 82 which rests against an end face defined by the first annular wall 1a. Also in the embodiment shown here, the cover ring element 80 comprises a sheet metal ring core, which has a torus cross section with an angle profile up. The elastomer body forming the sealing lip device 81 sits in the inner corner region of this angle profile. The elastomer seal shown can be connected as a pickled element or by vulcanizing material to the ring leg 83.

The angle profile comprises a ring leg 83 which on the one hand causes fat retention of the grease located in the region of the web space B by the sealing lip device and on the other hand also causes an additional narrowing of the potential passage region between the two bearing races 1, 2.

For the embodiments of Figures 9 and 10, the comments on Figure 8 apply mutatis mutandis. These embodiments differ from the variant according to FIG. 8, in particular with regard to the design of the In the embodiment according to FIG. 9, the ring bushing section 94 of the cover ring element 80 passing through the inner wall 2a is slightly flared radially and thus secured to the ring wall 2a.

In the embodiment according to FIG. 10, the cross-section of the cover ring element 80 is designed such that it forms, on the one hand, a bushing section extending through the inner circumferential opening 2a of the ring wall 2a and a fixing ring section 86 which is pressed back substantially by 90 degrees.

The inventive concept, a release bearing is provided with an angle ring for sealing the clutch near side of the release bearing. The angle ring is supported on a coupling-near plane surface of the inner ring flange and is centered over the inner ring bore in relation to the circumferential outer ring. The Axialverlauf and the cylindrical shoulder on the angle ring are arranged taking into account the minimum required clearance with a narrow gap to the bore of the outer ring and form a seal for sealing a labyrinth seal. To reduce wear in the contact region of the diaphragm spring for the inner preload of the release bearing is proposed to produce the sealing ring made of strip material deep-drawn and subjected to a heat treatment to achieve a surface hardness of at least 400 HV. Alternatively, the angle ring can also be made of already tempered material, eg C45 A + H or C17 MV with at least 400 HV. To improve the sealing effect in the sealing gap, it is proposed to provide a conveying thread on the outer diameter of the cylindrical projection of the angle ring and / or in the bore of the outer ring in the area of the sealing gap. As an effective device here in particular also mutually corresponding bevels on the lengthening approach of the sealing ring and the outer ring bore have been proven (see Figure 1 b). Advantages of execution:

Cost-effective production and assembly, effective sealing measure, especially in the version with conveying thread and bevels, due to the non-contact seal no wear, no friction at the sealing point and thus no additional heat input into the release bearing.

Claims

claims

1. clutch release bearing device with:

a first bearing race (1) having a first rolling body tread area (B1),

a second bearing race (2) which forms the bearing race around a bearing axis (X) and which forms a second rolling body running surface area (B2),

- Wherein the second bearing race (2) and the first bearing race (1) overlap each other in the axial direction and the second bearing race (2) in this case the first bearing race (1) engages on the outside, and

is formed both on the first bearing race (1), and on the second bearing race (2) in each case a radially inwardly below the radial level of the first Wälzkörperlaufflächenbereichs (B1) retracted annular wall (1 a, 2 a),

Rolling elements (W) which are accommodated in a path space (B) defined between the first bearing race (1) and the second bearing race (2),

- A cage means (3) for guiding the rolling elements (W) within the track space (B), and

a sealing device for suppressing the access of contaminants to the web space (B) via a potential passage region defined between the two annular walls, characterized in that the sealing device has a cover ring element (4) which is brought to a sealing or running gap zone (D), wherein the cover ring element (4) is integrated into the clutch release bearing device in such a way that the cross section of a potential particle passageway between the two annular walls is reduced and, in addition, the second annular wall (2a) formed by the second bearing race (2) opposite the cover ring element ( 4) rotates.

2. clutch release bearing device according to claim 1, characterized in that the sealing zone (D) between the Abdeckringelement (4) and the second annular wall (2 a) is formed.

3. clutch release bearing device according to claim 1 or 2, characterized in that the cover ring element (4) comprises a sheet metal ring.

4. Kupplungsausrücklagereinrichtung according to at least one of claims 1 to 3, characterized in that the Abdeckringelement (4) comprises an elastomeric structure (40).

5. clutch release bearing device according to claim 4, characterized in that the elastomeric structure (40) forms a sliding contact sealing lip (41, 42).

6. clutch release bearing device according to claim 5, characterized in that the sliding contact sealing lip (41) bears against a tread portion formed by the second annular wall (2 a).

7. clutch release bearing device according to claim 5 or 6, characterized in that the elastomeric structure (41) forms a plurality of sliding contact sealing lips (41, 42).

8. clutch release bearing device according to at least one of claims 1 to 7, characterized in that the tread portion by a second annular wall (2 a) on the inside bounding inner circumferential wall (2 b) is formed.

9. clutch release bearing device according to at least one of claims 1 to 8, characterized in that the tread portion is formed by an inner end face portion (2s) of the second annular wall (2a).

10. clutch release bearing device according to at least one of claims 1 to 9, characterized in that the Abdeckringelement (4) is connected to the first race (1).

11. clutch release bearing device according to claim 10, characterized in that the Abdeckringelement (4) by the first race (1) is centered.

12. Kupplungsausrücklagereinrichtung according to at least one of claims 1 to 11, characterized in that the Abdeckringelement (4) to a first race (1) bearing support bushing (5) is connected.

13. Kupplungsausrücklagereinrichtung according to at least one of claims 1 to 12, characterized in that on the second annular wall (2 a) a second Abdeckringelement (43) is connected, and that the sealing zone (D) between the first and the second Abdeckringelement (4, 43 ) is formed.

14. Kupplungsausrücklagereinrichtung according to claim 13, characterized in that the sealing zone (D) is formed such that a passageway to be overcome there from a radially outer level to a radially further inward, i. Achsnäher lying circumferential level leads.

15. Clutch release bearing device with:

a first bearing race (1) having a first rolling body tread area (B1),

- A second bearing race (2) of the about a bearing axis (X) encircling bearing race and which forms a second Wälzkörperlauf- surface area (B2), wherein the second bearing race (2) and the first Bearing race (1) overlap each other in the axial direction and the second bearing race in this case the first bearing race (1) engages around the outside, and both on the first bearing race (1), as well as on the second bearing race (2) each have a radially inwardly below the radial level of first Wälzkörperlaufbereichs (B1) retracted annular wall (1 a, 2a) is formed,

- A sealing device for suppressing the ingress of contaminants to the web space (B) via a coupling side, defined between the two annular gaps, characterized in that the sealing means comprises a Abdeckringelement (81, 94) which dips into a sealing zone (D) the cover ring element (81, 94) is connected to the second annular wall (2a) in such a way that it engages through an inner opening defined by the second annular wall (2a).

16. clutch release bearing device according to claim 15, characterized in that the Abdeckringelement (81, 94) on the second annular wall (2a) is anchored positively.

17. Kupplungsausrücklagereinrichtung according to claim 15 or 16, characterized in that the Abdeckringelement (81, 94) is anchored via a beading on the second annular wall.

18. clutch release bearing device according to at least one of claims 15 to 17, characterized in that the covering ring element (81, 94) comprises a sealing lip device made of an elastomeric material.

19. A clutch release bearing device according to at least one of claims 15 to 18, characterized in that the sealing lip device has a sealing lip (82) which bears against a face defined by the first annular wall (1 a).

20. Kupplungsausrücklagereinrichtung according to at least one of claims 15 to 19, characterized in that the Abdeckringelement (81, 94) comprises a sheet metal ring core (83) having a Torusquerschnitt with an angle profile, and that the elastomeric body carrying the sealing lip device sits in the inner corner region of this angle profile.

21. A clutch release bearing device according to claim 20, characterized in that the angle profile comprises a ring leg which, leaving a gerigen running gap (SL) to the first annular wall (1 a) of the first bearing race (1) penetrates.

22. A clutch release bearing device according to the preamble of patent claim 1, characterized in that the sealing device comprises a cover ring element (4) which is brought to a sealing or running gap zone (D), wherein the cover ring element (4) is centered on an inner circumferential wall of an inner opening which is formed by the first annular wall (1 a) or the second annular wall (2 a).

23. A clutch release bearing device according to claim 22, characterized in that the cover ring element (4, 43) is secured to the aforementioned inner circumferential wall.