DE102020123584A1 - roller bearing arrangement - Google Patents

Abstract

The invention relates to a rolling bearing arrangement (1), comprising a rolling bearing (2) with an inner ring (3), an outer ring (4), rolling bodies (5) and a cage (6), the inner ring (3) having an inner ring raceway (7) and the outer ring (4) has an outer ring raceway (8), the rolling elements (5) being mounted in the cage (6) so as to roll between the inner ring (3) and the outer ring (4) at a distance from one another, the cage (6) being a snap cage (9) is formed, with a snap cage ring (10) and in the snap cage ring (10) formed snap cage pockets (11) in which the rolling elements (5) are rotatably accommodated, the snap cage ring (10) being attached to the snap cage pockets (11 ) facing away from end faces (20) has a ring portion (21) which protrudes in the axial direction from a radial plane (22) of the snap cage ring (10).

Description

The invention relates to a roller bearing arrangement, comprising a roller bearing with an inner ring, an outer ring, roller bodies and a cage, the inner ring having an inner ring raceway and the outer ring having an outer ring raceway, the roller bodies between the inner ring and the outer ring being mounted in the cage in a rolling manner and spaced apart from one another wherein the cage is formed as a snap cage having a snap cage ring and snap cage pockets formed in the snap cage ring.

Snap cages for roller bearings, in particular for ball bearings, are generally known in various designs. The most common forms have a continuous solid walled snap cage ring on one side, while shell-like slotted or recessed snap cage pockets are arranged on the other side so that the snap cage pockets are resilient and the rolling elements can snap into the snap cage pockets. For example, in the DE 10 2015 214 850 A1 discloses such a massive plastic cage.

There is a continuing need to optimize snap cages with regard to their strength properties.

It is therefore the object of the present invention to provide a snap cage for a roller bearing arrangement which is optimized in terms of its strength properties.

This object is achieved by a rolling bearing arrangement, comprising a rolling bearing with an inner ring, an outer ring, rolling bodies and a cage, the inner ring having an inner ring raceway and the outer ring having an outer ring raceway, the rolling bodies between the inner ring and the outer ring being mounted in the cage at a distance from one another are arranged, wherein the cage is designed as a snap cage, with a snap cage ring and in the snap cage ring formed snap cage pockets in which the rolling elements are rotatably accommodated, wherein the snap cage ring has a ring section on the end faces facing away from the snap cage pockets, which in the axial direction from a radial plane of the snap cage ring protrudes.

The core idea of the invention is therefore a profiling of the rear side of the snap cage in such a way that the axial width and thus the rigidity of the snap cage is as constant as possible.

The back of a snap cage, as is known from the prior art and in which 2 , left figure, is usually flat in design. This type of snap cage is usually less axially wide than the bearing, so it is usually located within the bounding box defined by the outside dimensions of the bearing (the snap cage is inside a notional block that has the same outside dimensions as the bearing) . This leads, as in the 2 , left figure clearly visible, to an axially thin ring section, which usually represents the point of the lowest rigidity of the snap cage.

The back of the snap cage according to the invention is thus no longer flat, its axial width is greater in the region of the snap cage pockets, as a result of which the rigidity of the snap cage can be improved. Since the cross section is also larger, when the snap cage is formed of plastic, the resistance in injection molding also decreases.

In one embodiment of the invention, the proposed snap cage can be designed to be axially wider than the roller bearing.

First, the individual elements of the claimed subject matter of the invention are explained in the order in which they are mentioned in the set of claims, and particularly preferred configurations of the subject matter of the invention are described below.

Rolling bearings can be used in particular to enable rotary movements with the lowest possible friction losses. Rolling bearings can be used in particular to fix and/or mount axles and shafts, depending on the design, absorbing radial and/or axial forces and at the same time enabling the rotation of the shaft or the components mounted on an axle in this way.

For this purpose, rolling elements are arranged between an inner ring and an outer ring of the roller bearing. Between these three main components, inner ring, outer ring and the rolling elements, it is usually mainly rolling friction that occurs within the rolling bearing. Since the rolling elements in the inner and outer ring can preferably roll on hardened steel surfaces with optimized lubrication, the rolling friction of such bearings is relatively low. A roller bearing can have one or more rows.

The inner ring can in particular connect the shaft accommodating the roller bearing to the roller bearing or the roller bodies. In particular, the shaft can be connected to the side of the lateral surface of the inner ring that faces the shaft, the rolling elements of the rolling bearing roll on the inner ring raceway opposite this lateral surface. The inner ring can be made of a metallic and/or ceramic material. In principle, it is conceivable to design the inner ring in one piece or in multiple pieces, in particular in two pieces.

The outer ring can, in particular, connect the bearing arrangement accommodating the roller bearing to the roller bearing or the roller bodies. In particular, the bearing can be connected to the side of the lateral surface of the outer ring facing the bearing, the rolling elements of the roller bearing rolling on the outer ring raceway opposite this lateral surface. The outer ring can be made of a metallic and/or ceramic material. In principle, it is conceivable to design the outer ring in one piece or in multiple pieces, in particular in two pieces.

Depending on the type of rolling bearing, the rolling elements have the shape of a ball or a roller. They roll on the raceways of the roller bearing and have the task of transferring the force acting on a radial roller bearing from the outer ring to the inner ring and vice versa. In an axial roller bearing, the rolling elements transmit the forces acting on the axial roller bearing between the running disks. Roller-shaped rolling elements are also referred to as roller rolling elements and spherical rolling elements as bearing balls.

Roller-shaped rolling bodies can be selected, for example, from the group of symmetrical spherical rollers, asymmetrical spherical rollers, cylindrical rollers, needle rollers and/or tapered rollers.

Rolling elements can be guided and spaced apart in a cage or by rolling element spacers. In principle, it is also conceivable to design a roller bearing without a cage, which is also referred to as a full complement roller bearing. In full complement rolling bearings, adjacent rolling elements can touch.

A roller bearing according to the invention has a cage, with the cage guiding the rolling elements. The cage is designed in such a way that the rolling element balls and/or the rolling element rollers are spaced apart from one another so that, for example, the friction and heat development of the rolling elements is kept as low as possible. Furthermore, the cage keeps the rolling element balls and/or rolling element rollers at a fixed distance from one another during rolling, as a result of which an even load distribution can be achieved. The cage can be made in one piece or in several pieces.

The rolling bodies can roll within the rolling bearing, in particular on the inner ring raceway of the inner ring. For this purpose, the surface of the inner ring raceway can advantageously be designed to be correspondingly abrasion-resistant, for example also by means of a corresponding surface treatment method and/or by applying a corresponding additional layer of material.

The inner ring raceway can be flat or profiled. A profiled design of the inner ring raceway can be used, for example, to guide the rolling elements on the inner ring raceway. On the other hand, a planar formation of the inner ring raceway can, for example, allow a certain axial displaceability of the rolling elements on the inner ring raceway.

The rolling bodies can roll within the rolling bearing, in particular on the outer ring raceway of the outer ring. For this purpose, the surface of the outer ring raceway can advantageously be designed to be abrasion-resistant, for example by means of a corresponding surface treatment process and/or by applying a corresponding additional layer of material.

The outer ring raceway can be flat or profiled. A profiled design of the outer ring raceway can be used, for example, to guide the rolling elements on the outer ring raceway. On the other hand, a planar shape of the outer ring raceway can, for example, allow a certain axial displaceability of the rolling elements on the outer ring raceway.

In principle, the ring section can have any contour. However, the roller bearing arrangement preferably has a ring section which is of convex design. It can also be preferred that the ring section has a linear contour at least in sections.

In a further preferred embodiment of the invention, provision can be made for the ring section to protrude from the roller bearing in the axial direction.

Furthermore, it is particularly preferred that the snap cage is molded from a plastic.

A particularly good rigidity of the snap cage can preferably be achieved by the snap cage pockets each having an arcuate opening contour with a turning point and the ring sections each having a contour with a turning point, the turning point being a snap cage pocket and the turning point point of a ring section are arranged on an axially extending axis.

In order not to have to make any structural changes to an existing roller bearing, in particular to the bearing rings, it can be provided that the roller bearing arrangement comprises a bearing seat in which the roller bearing is arranged, with the bearing seat having a circumferential, annular groove on one end, into which the Ring section engages.

• 1 eine Wälzlageranordnung in einer schematischen Schnittansicht,
• 2 zwei Schnappkäfigringe in einer schematischen perspektivischen Gegenüberstellung.

The invention will be explained in more detail below with reference to drawings without restricting the general inventive idea. The drawings are only schematic in nature and are intended solely for understanding the invention. The same elements are provided with the same reference numbers. The different features of the various exemplary embodiments can also be freely combined with one another within what is technically feasible. Show it:

• 1 a roller bearing assembly in a schematic sectional view,
• 2 two snap cage rings in a schematic perspective comparison.

1 shows a roller bearing arrangement 1 according to the invention, comprising a roller bearing 2 with an inner ring 3, an outer ring 4, rolling elements 5 and a cage 6. The inner ring 3 has an inner ring raceway 7 and the outer ring 4 has an outer ring raceway 8. The rolling elements 5 are between the inner ring 3 and Outer ring 4 mounted for rolling in the cage 6 spaced apart. The cage 6 is designed as a snap cage 9, which is good in the right figure 2 is evident. The snap cage 9 has a snap cage ring 10 and snap cage pockets 11 formed in the snap cage ring 10 and in which the rolling elements 5 are rotatably accommodated.

The snap cage ring 10 also has a ring section 21 on the end faces 20 facing away from the snap cage pockets 11 , which ring section 21 protrudes in the axial direction from a radial plane 22 of the snap cage ring 10 . The ring portion 21 is in the illustrated embodiment 2 , right figure, convex. The snap cage pockets 11 each have an arcuate opening contour 26 with a turning point 27. The ring sections 21 also each have a contour with a turning point 28, with the turning point 26 of a snap cage pocket 11 and the turning point 28 of a ring section 21 being arranged on an axially running axis 29 . In the exemplary embodiment shown, the snap cage 9 is formed from a plastic.

The ring portion 21 can protrude in the axial direction from the rolling bearing 2, as in FIG 1 is shown as an example. The roller bearing arrangement 1 therefore has a bearing seat 23 in which the roller bearing 2 is arranged, the bearing seat 23 having a circumferential, annular groove 24 on one end face 25, into which the ring section 21 engages.

The bearing seat 23 has an axial stop for the outer ring 4 which has approximately the same radial height a as the outer ring 4 . The groove 24 is formed by a section b which is arranged in the radial direction below the axial stop and is set back in the axial direction towards the roller bearing 2 . The groove 24 has an axial depth which is greater than the axial overhang c of the snap cage 9 relative to the outer ring 4.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be considered as limiting but as illustrative. The following patent claims are to be understood in such a way that a mentioned feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two similar features without establishing a ranking.

Reference List

1

roller bearing arrangement

2

roller bearing

3

inner ring

4

outer ring

5

rolling elements

6

Cage

7

inner ring raceway

8th

outer ring raceway

9

snap cage

10

snap cage ring

11

snap cage bags

20

end faces

21

ring section

22

radial plane

23

bearing seat

24

groove

25

face

26

opening contour

27

turning point

28

turning point

29

axis

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102015214850 A1 [0002]

Claims (7)

Rolling bearing arrangement (1), comprising a rolling bearing (2) with an inner ring (3), an outer ring (4), rolling bodies (5) and a cage (6), the inner ring (3) having an inner ring raceway (7) and the outer ring (4) has an outer ring raceway (8), the rolling elements (5) being mounted in rolling fashion between the inner ring (3) and the outer ring (4) in the cage (6) and spaced apart from one another, the cage (6) acting as a snap cage (9 ) is formed, with a snap cage ring (10) and in the snap cage ring (10) formed snap cage pockets (11) in which the rolling bodies (5) are rotatably accommodated, characterized in that the snap cage ring (10) on the respective snap cage pockets (11) Facing away from end faces (20) has a ring section (21) which protrudes in the axial direction from a radial plane (22) of the snap cage ring (10). Rolling bearing arrangement (1) according to claim 1 , characterized in that the ring section (21) is convex. Rolling bearing arrangement (1) according to claim 1 or 2 , characterized in that the ring section (21) has a linear contour at least in sections. Rolling bearing arrangement (1) according to one of Claims 1 until 3 , characterized in that the ring section (21) protrudes in the axial direction of the roller bearing (2). Rolling bearing arrangement (1) according to one of Claims 1 until 4 , characterized in that the snap cage (9) is molded from a plastic. Rolling bearing arrangement (1) according to one of Claims 1 until 5 , characterized in that the snap cage pockets (11) each have an arcuate opening contour (26) with a turning point (27) and the ring sections (21) each have a contour with a turning point (28), the turning point (26) of a snap cage pocket (11 ) and the turning point (28) of a ring section (21) are arranged on an axially extending axis (29). Rolling bearing arrangement (1) according to one of Claims 1 until 6 , characterized in that the roller bearing arrangement (1) comprises a bearing seat (23) in which the roller bearing (2) is arranged, the bearing seat (23) having a circumferential, annular groove (24) on one end face (25), in which the ring section (21) engages.

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