DE1066815B - - Google Patents

Description

GERMAN

The guidance of the cage in the axial direction through the rolling elements is the case with ball bearings and roller bearings common practice with on-board guidance. In the case of needle roller bearings or rimless roller bearings, on the other hand, the cage is used held in its axial position by rims, washers or snap rings and runs with its end face as a sliding washer against the end faces of said elements. This requires very careful editing of these surfaces sliding on each other and attention to the material pairing. To attach this axial Ίο Start-up elements are often sharp-edged grooves or shoulders required, the general effects of which on the design and manufacture are known.

Known is a borderless needle or roller bearing with a cage, in addition to at least one load-bearing Rolling bodies an additional row of rolling bodies held axially by the cage is provided. These The purpose of an additional row of rolling elements is to center the cage and to prevent it from becoming ao comes into contact with one or the other bearing raceway. The rolling elements are the additional Rolling element row exclusively guided in the cage end rings, while they are on the outer or inner Running ring of the bearing run without a guide. To achieve the above-mentioned purpose, every No need to guide the additional row of rolling elements in the inner or outer race of the bearing.

The invention is based on a rimless needle or roller bearing with a cage, in addition to at least At least one load-bearing row of rolling elements is provided with an additional row of rolling elements held axially by the cage.

According to the invention, a proposal is made to convert the axially held row of rolling elements into a circumferential one To allow at least one raceway to engage groove that the cage is axially guided without the additional row of rolling elements even absorbs radial bearing load. With this design of the rimless needle or roller bearing with cage, instead of the previous Herigen used additional thrust elements used simple balls or rollers. In this way a large part of the sliding friction is eliminated and the overall friction of the bearing is reduced.

It is particularly advantageous to provide balls, since they provide very simple rolling conditions. However, it is also possible to use rollers which • absorb the axial forces of the cage either with their end faces or through their spherical design.

The axial forces of a cage are very low if the raceways and the rolling elements are accurate. So it is enough, very little To use rolling elements for the axial guide row Bordless needle or roller bearings with cage

Applicant: Industriewerk Schaeffler o.H. G. Herzogenaurach

'den ;, in practical cases, however, one will hardly go below a number of three rolling elements which are expediently arranged evenly distributed around the circumference.

A special embodiment for the axial guidance of the cage is given when the cage has a Has running groove for balls or rollers, which together with a corresponding raceway in one of the two races forms a thrust bearing.

To avoid noises caused by the additional row of rolling elements, the rolling elements can be made of suitable plastics, since ThTe ™ 'eläsfiscfie "Veriörmüng does not result in any disadvantages and their load-bearing capacity is sufficient to absorb the axial forces.

It should also be pointed out that the content of the subclaims is only protected in context with the main claim is desired.

Details of the invention are illustrated in the drawings, for example. It shows

Fig. 1 shows a cage with radially and axially supporting needle row leading row of balls in incorporated form in longitudinal section;

Fig. 2 shows a special design of the ball pockets in the cage in longitudinal section,

3 shows a cage with a radially supporting row of needles and an axially and radially leading row of rollers between the cage and the inner raceway in a longitudinal section.

In Fig. 1 , 1 is the cage with the windows 2 for the row of needles 3 and the windows 4 for the row of balls 5. The needles 3 transmit the load on the shaft 6 to the outer race 7. This has a circumferential track 8 of the needles Groove 9 for the axial guidance of the balls 5. These have such a large radial play between the groove base 10 and the shaft jacket 11 that they cannot take up any radial load. With axial displacement of the outer ring

909 637/203

Claims (6)

The balls on the shaft move towards the shaft, so that they are practically always in the center of the groove of the outer ring. At this point in particular, centrifugal force ensures precise alignment. For assembly or when removing the shaft, the needles ■ and the balls are secured against falling out by known retaining projections. These projections are represented for the balls by the edges 12, for example, and are shown in FIG. 2 on an enlarged scale. These projections 12 in FIG. 2 can be designed so that the balls are held so far outwards that the shaft or the inner raceway is no longer touched by the balls. Finally, the balls can be arranged as a closed ring in a groove on the cage. This can, as Fig. 3 shows, for example, so that the rolling bodies, for example cylindrical rollers 13, in the inner shell 14 of the cage 15 have a pierced roller track 16, in which the rollers the cage at their end faces 17 and the shoulders 18 of the Ein 'Stiches 16 lead axially. The rollers are axially guided in the recess 19 of the shaft 20, so that the cage is fixed in the axial direction relative to the shaft. The depth of the recess on the shaft can be coordinated with the diameter of the roller body so that a simultaneous radial guidance of the cage is achieved concentrically to the shaft. Since there is no load on the rolling elements other than the centrifugal force of the cage, the rolling elements can be made of plastic with damping properties. Patent claims: 1. Bordless needle or roller bearing with cage, in addition to at least one load-bearing row of rolling elements an additional row of rolling bodies axially held by the cage is provided, thereby characterized in that the axially held row of rolling elements in a circumferential groove at least engages a raceway so that the cage is axially guided without the additional row of rolling elements even absorbs radial bearing load. 2. needle or roller bearing according to claim 1, characterized in that the additional row of rolling elements consists of balls. Needle or roller bearing according to Claim 1, characterized in that the additional row of rolling bodies consists of roles. 4. needle or roller bearing according to claim 1 to 3, characterized in that this row of rolling bodies contains only three appropriately evenly distributed rolling elements around the circumference. 5. Needle or roller bearings after. Claim 1 to 4, characterized in that the cage is a Has a circumferential groove that serves as a track for the additional rolling element ring. 6. needle or roller bearing according to claim t to 5, characterized in that the additional row of rolling elements consists of plastic. Considered publications:
French patent specification No. 584 717. 1 sheet of drawings