CN113738763A

CN113738763A - Rolling bearing comprising anti-wear rings and associated manufacturing method

Info

Publication number: CN113738763A
Application number: CN202110930370.5A
Authority: CN
Inventors: B.阿诺特; P.沃尔特
Original assignee: SKF AB
Current assignee: SKF AB
Priority date: 2015-01-23
Filing date: 2016-01-22
Publication date: 2021-12-03
Also published as: FR3032016B1; CN105822671A; FR3032016A1

Abstract

Rolling bearing comprising an inner ring (14), an outer ring (16), at least one row of rolling elements (18) positioned inside a rolling space (24) defined between said rings, and a wear-resistant ring (26) fixed on one of said rings (16) and comprising a main body (26a) abutting against an outer surface of said ring. The anti-wear ring (26) additionally includes at least one post (26b), the post (26b) extending from the body (26a) and through a through-groove (30) formed within the thickness of the ring. The wear ring (26) further includes at least one flange (26c) extending from the post and resulting from localized plastic deformation of the post. The flange extends inside the rolling space (24) and reaches to face the inner surface opposite to the outer surface of the ring.

Description

Rolling bearing comprising anti-wear rings and associated manufacturing method

The present application is a divisional application of an invention patent application having an application date of 2016, 1 and 22, an application number of 201610135892.5, entitled "rolling bearing including anti-wear ring and related manufacturing method".

Technical Field

The present invention relates to the field of rolling bearings, in particular for use in a separator release bearing arrangement intended to act on a clutch diaphragm, in particular for a motor vehicle.

Background

Such a device has a rolling bearing, one of the rings of which is rotating and the other ring is fixed, the rotating ring being provided with a radial driving surface for coming into contact with the end of the stem of the clutch diaphragm.

The non-rotating operating member supports the rolling bearing and, upon actuation of a control component (mechanical, electrical or hydraulic), axially moves the bearing to bring the driving surface of the rotating ring against the diaphragm of the clutch and actuate the clutch mechanism.

In order to limit the wear caused by the friction between the rod of the diaphragm and the rotating ring during the operation of the decoupler and the clutch, an anti-wear ring made of synthetic material can be fixed on said rotating ring. For more details about such anti-wear rings, reference may be made, for example, to patent application FR-a 1-2883347.

In the bearing described in this prior art document, a shoulder is provided which is crimped on the rotating ring to ensure that the anti-wear ring remains on the ring. However, this solution has the disadvantage of increasing the number of bearing assemblies to be manufactured, stored and assembled.

Disclosure of Invention

The object of the present invention is to overcome said drawbacks.

More specifically, it is an object of the present invention to provide a rolling bearing for a separator bearing device having a reduced number of components and which is easy to manufacture.

In one embodiment, the rolling bearing comprises an inner ring, an outer ring, at least one row of rolling elements positioned inside a rolling space defined between the rings, and an anti-wear ring fixed on one of the rings and comprising a body abutting against an outer surface of the ring. The wear resistant ring additionally includes at least one post extending from the body and through a through-groove formed in a thickness of the ring. The wear ring also includes at least one flange extending from the post portion and obtained by localized plastic deformation of the post portion. The flange extends inside the rolling space and reaches to face the inner surface opposite to the outer surface of the ring.

A flange facing the inner surface of the outer ring facilitates fastening of the anti-fretting ring relative to the outer ring. The flange forms a means for retaining the wear resistant ring on the outer ring. The engagement of the anti-wear ring on the ring is achieved without the use of associated additional components.

In a preferred embodiment, the flange abuts against an inner surface of the collar. Thus, the risk of relative movement between the anti-wear ring and the ring is limited.

Preferably, the flange extends over the entire periphery of the post portion.

In one embodiment, the liner is axially mounted facing the inner surface of the ring. The through groove may be provided in a radial portion of the ring.

In one embodiment, the inner surface of the ring comprises locally at least one recess, the flange being brought to face this recess. This can restrict the flange portion from extending the protrusion against the inner surface of the ring.

The anti-wear ring may additionally comprise a centring portion axially elongated towards the inside of the body and provided with a surface in radial contact with said ring.

In one embodiment, the anti-galling ring comprises a plurality of posts extending from the body, each passing through a suitable through-groove formed within the thickness of the ring, each post comprising at least one flange obtained by local plastic deformation of the post.

The wear resistant ring may be integrally made of a synthetic material.

The invention also relates to a separator separation bearing device comprising a rolling bearing as defined previously and an operating member supporting the bearing.

The invention also relates to a method for manufacturing a rolling bearing of the type comprising an inner ring, an outer ring and at least one row of rolling elements interposed between said rings, in which rolling bearing an anti-wear ring is mounted against the outer surface of one of said rings, the anti-wear ring comprising at least one pillar portion so as to locally extend said pillar portion through a groove provided in the thickness of said ring, at least heating said pillar portion and locally pushing the material of said pillar portion in the direction of the inner surface opposite to the outer surface of said ring to ensure that the anti-wear ring remains on said ring.

Drawings

The invention will be better understood by studying the detailed description of an embodiment, cited by way of non-limiting example and described by way of the attached drawings, in which:

figure 1 is an axial half-section view of a rolling bearing according to a first embodiment of the invention,

figure 2 is an axial half-section view showing the steps of the manufacturing method of the bearing of figure 1,

figure 3 is an axial half-section view of a rolling bearing according to a second embodiment of the invention, an

Figure 4 is an axial half-section view showing the steps of the manufacturing method of the bearing of figure 3.

Detailed Description

In fig. 1, the rolling bearing, the whole assembly of which is designated 10, is intended to be used in a separator release bearing device arranged to act on a diaphragm 12 of a clutch, in particular for a motor vehicle. In this figure, the diaphragm 12 is partially shown and represented in phantom. Diaphragm 12 includes a plurality of circumferentially spaced rods 12 a. The rolling bearing 10 is intended to be mounted on an operating member (not shown) of an associated separator-separator bearing device and is arranged to move axially.

The rolling bearing 10 of axis 10a comprises a non-rotating inner ring 14, a rotating outer ring 16, a row of rolling elements 18, here in the form of balls, radially interposed between the rolling paths provided on said ring, a cage 20 for maintaining a regular circumferential spacing of the rolling elements 18, and an annular sealing gasket 22 fixed to the outer ring. A rolling space 24 is defined radially between the inner race 14 and the outer race 16. The rolling members 18 and the associated cage 20 are placed inside the rolling space 24. As described in more detail below, the bearing 10 additionally includes a wear resistant ring 26, the wear resistant ring 26 being mounted on the outer race 16 and disposed to axially contact the diaphragm 12 against the clutch.

The inner ring 14, having a thin wall and an axis 10a, can advantageously be made by stamping a sheet material, for example a steel sheet material. The inner ring 14 is made in one piece. The inner ring 14 comprises an annular portion 14a, which annular portion 14a has, in cross-section, a concave inner profile on a quarter circle forming a rolling track or path of said ring for the rolling members 18. The inner ring 14 also includes an annular axial portion 14b, which annular axial portion 14b axially extends the edge of the annular portion 14a having the large diameter to the opposite face of the outer ring 16. The inner ring 14 further includes an annular radial portion 14c that extends the edge of the annular portion 14a having a small diameter and radially toward the inside, and the annular radial portion 14 c. The radial portion 14c is axially positioned opposite the axial portion 14b with respect to the annular portion 14 a.

The outer ring 16, having a thin wall and an axis 10a, can advantageously be made by stamping a sheet material, for example a steel sheet material. The outer race 16 is made in one piece. The outer ring 16 comprises an annular portion 16a, which annular portion 16a has, in cross-section, a concave inner profile on a quarter circle forming a rolling track or path of said ring for the rolling members 18. The annular portion 16a is extended at each end by annular

axial portions

16b, 16 c. The axial portion 16b extends the annular portion 14a of the annular portion 16a having the edge with the large diameter and radially surrounding the inner ring. The axial portion 16c axially extends the edge of the annular portion 16a having a small diameter to the opposite face of the axial portion 16 b. The outer ring 16 also includes an annular radial portion 16d, which annular radial portion 16d extends the axial portion 16c radially inwardly.

A sealing gasket 22 is secured to the outer race 16 and acts as an active seal with the inner race 14. "dynamic seal" refers to a seal between two parts that have relative motion. A sealing washer 22 is secured in the bore of the axial portion 16b of the outer race and rubs against the outer surface of the axial portion 14b of the inner race.

Wear ring 26 is configured to engage diaphragm 12 by contact. The wear resistant ring 26 is integrally formed. The wear resistant ring 26 is made of a synthetic material. Indicatively, the anti-wear ring 26 may be made of polyamide, filled or unfilled with mineral fibres or carbon, for example.

The anti-wear ring 26 comprises an annular body 26a mounted against an outer surface 28 of the outer ring 16, the outer surface 28 of the outer ring 16 being oriented towards the outside of the bearing, i.e. the side opposite the rolling members 18. The body 26a partially covers the outer surface 28. The outer surface 28 is formed by the outer surface of the collar. The outer surface 28 is formed by the outer surfaces 16a to 16d of the different parts of the outer race. In the embodiment shown, the body 26a covers the outer radial portion 16d of the bearing. Body 26a defines a driving or front bearing surface configured to axially engage, by contact, stem 12a of the diaphragm. The diaphragm 12 bears axially against the body 26a of the anti-wear ring from the side opposite the outer ring 16.

The wear ring 26 also includes a post 26b that extends from the body 26a and through a groove 30 provided on the outer ring 16. The post 26b extends axially inward from the body 26 a. The post 26b extends inside the groove 30 and opens into the rolling space 24 defined between the

rings

14, 16. The post 26b has a shape complementary to the recess 30. The post 26b extends circumferentially over a limited angular sector. A small fitting clearance is provided between the pillar portion 26b and the groove 30.

The groove 30 of the outer ring is through. The groove 30 is provided within the thickness of the outer race 16. A groove 30 extends from the outer ring outer surface 28 and opens into an inner surface 32 opposite the ring outer surface. The inner surface 32 of the outer race 16 is oriented toward the bearing interior, i.e., the side of the rolling members 18. The outer surface 28 and the inner surface 32 define the thickness of the collar. The inner surface 32 is formed by the inner surface of the outer race. The inner surface 32 is formed by the inner surfaces of the different parts 16a to 16d of the outer ring. In the illustrated embodiment, the groove 30 is disposed through the outer race radial portion 16 d. The recess 30 has here a cylindrical shape. Alternatively, the recess may have other shapes, for example polygonal, such as square, rectangular, etc. The groove may also have a conical shape with an opening expanding in the direction of the rolling space 24.

The wear ring 26 also includes an outer flange 26c that extends the post 26b and is mounted facing the inner surface 32 of the outer ring. In the illustrated embodiment, the post 26b abuts the inner surface 32. The flange 26c extends over the entire periphery of the post portion 26 b. The flange 26c forms an annular flange extending circumferentially along the post portion 26 b. Alternatively, the flange 26c may be discontinuous in the circumferential direction.

The flange 26c extends within the rolling space 24 defined between the

rings

14, 16. The flange 26c extends radially. The flange 26c bears axially against the inner surface 32. The flange 26c here bears axially against the inner surface 32 of the radial portion 16 d. In the illustrated embodiment, an annular recess 34 is formed in the inner surface 32 of the radial portion 16d, and the flange 26c axially abuts the bottom of the recess 34. The recess 34 may be formed, for example, by spot facing. As described in more detail below, the flange 26c is obtained by localized plastic deformation of the post 26 b. The flange 26c and the post 26b are integral, i.e., made integrally, with the body 26 a.

The anti-wear ring 26 also comprises a centring portion 26d, which centring portion 26d is elongated towards the inside of the body 26a and is arranged to ensure centring of said anti-wear ring with respect to the outer ring 16. The annular shaped centering portion 26d axially extends the body 26 a. The centering portion 26d extends the edge of the main body 26a having a small diameter. The centering portion 26d is centered in the bore of the outer race 16. The centering portion 26d has an outer surface in radial contact with the aperture. The centering portion 26d is mounted in a bore of the radial portion 16d of the outer race.

In order to fix the anti-wear ring 26 to the outer ring 16, the following process is performed. In a first step, shown in fig. 2, the anti-wear ring 26 is brought against the outer surface 28 of the outer ring. This contact fit is achieved by a simple axial thrust. At this stage, the anti-wear ring 26 obtained beforehand by casting is not provided with the flange 26c (fig. 1). In this position, the posts 26b extend within the groove 30 of the outer race and project axially within the interior of the race. Next, in the second step, the pillar portion 26b is heated from the side opposite to the main body 26 a. Then, in a third step, the flange 26c is formed by plastic deformation of the free end of the post portion 26 b. In this step, a portion of the material of the post 26b is urged to cause axial compression of the material against the inner surface of the outer ring radial portion 16d and radially outward compression of the material. This results in a form of intervention that prevents movement of the anti-wear ring 26 relative to the outer ring 16. The material deformation of the post portion 26b is achieved by an axial thrust. The flange 26C is formed by heat staking.

The flange 26c, which cooperates with the inner surface 32 of the outer ring, helps to prevent the anti-scuff ring 26 from being extracted relative to the outer ring. The flange 26c forms a means for axially retaining the anti-wear ring on the outer ring 16. The flange 26c cooperates with the outer ring 16 by a diametric intervention. The anti-wear ring 26 is fixed to the outer ring 16 by an intermediate part integral with said anti-wear ring.

In the embodiment shown in fig. 3, in which like components have like reference numerals, this embodiment differs from the first embodiment in that the wear-resistant ring 26 includes an annular centering portion 26e that axially extends towards the inside the edge of the main body 26a having a large diameter. The centering portion 26e is centered on the outer surface 28 of the outer race. The centering portion 26e has an inner surface in radial contact with the outer surface 28. The centering portion 26d radially surrounds the radial portion 16c of the outer race. In this embodiment, the anti-wear ring 26 includes a groove 36 formed from the free end of the pillar portion 26b and oriented axially inward of the bearing, i.e., toward the rolling members 18.

In order to achieve the fixing of the anti-wear ring 26 on the outer ring 16, the process is performed in a similar manner to that described above. As shown in fig. 4, after the anti-wear ring 26 has been brought into abutment against the outer ring outer surface 28, the column portion 26b where the flange 26c (fig. 3) is not provided is heated from the side opposite to the main body 26 a. Then, the flange 26c is formed by the free end of the column portion 26b being plastically deformed by an axial thrust. The grooves 36 provided on the post portion 26b can reduce the amount of material to be plastically deformed and the duration of the manufacturing process. The fixing of the anti-wear ring 26 on the outer ring 16 is achieved by a heat deformation and pressing step, for example by riveting or ultrasonically welding the flange 26c to the outer ring.

In the described embodiment, the flange of the wear resistant ring abuts against the inner surface of the outer ring. Alternatively, the flange facing the inner surface of the outer ring may be provided by having a small gap between the flange and the inner surface of the outer ring.

In the illustrated embodiment, the anti-fretting ring includes a post portion that extends axially through a groove provided on a radial segment of the outer ring. Alternatively, the post portion may extend radially from the body of the wear ring and extend within a groove provided through the axial portion of the outer race.

In the described embodiment, the wear ring includes a single post portion. Alternatively, the wear resistant ring may comprise a plurality of posts extending from the body, the plurality of posts lying on the same radial plane and preferably being spaced in a regular manner relative to each other in the circumferential direction. Each slot extends through a groove formed in the outer race as appropriate thereto. Preferably, each roller comprises a flange obtained by local plastic deformation of the post.

The invention has been described on the basis of a rolling bearing in which an anti-wear ring is fixed to an outer ring. Alternatively, the anti-wear ring may be fixed to the inner ring while the inner ring is arranged to rotate.

Claims

1. A rolling bearing comprising: an inner ring (14); an outer ring (16); at least one row of rolling members (18) disposed within a rolling space (24) defined between the rings; and an anti-wear ring (26) fixed to one of said rings (16) and comprising a body (26a) supporting an outer face of said ring, characterized in that said anti-wear ring (26) further comprises: at least one post (26b) extending from the body (26a) and passing through a cylindrical or polygonal through groove (30) formed within the thickness of the ring; and at least one flange (26c) extending from the post and obtained by local plastic deformation of the post, said flange extending inside the rolling space (24) and facing an inner face of the ring opposite to the outer face.

2. The bearing of claim 1, wherein the flange is supported against an inner face of the ring.

3. Bearing according to claim 1 or 2, wherein the flange (26c) extends over the entire circumference of the pillar part.

4. Bearing according to any of the preceding claims, wherein the flange (26c) is mounted axially opposite the inner face of the ring.

5. Bearing according to any of the preceding claims, wherein the through groove (30) is formed in a radial portion (16d) of the ring.

6. Bearing according to any of the preceding claims, wherein the inner face of the ring locally comprises at least one notch (34), the flange (26c) facing the at least one notch (34).

7. Bearing according to any of the preceding claims, wherein the anti-fretting ring (26) further comprises a centring portion (26 d; 26e) axially extending the body (26a) inwards and provided with a surface in radial contact with the ring.

8. Bearing according to any of the preceding claims, wherein the anti-galling ring comprises a plurality of posts (26b) extending from the body (26a) and each extending through a respective through-groove (30) formed in the thickness of the ring, each post comprising at least one flange (26c) obtained by local plastic deformation of the post.

9. Separator split bearing device comprising a rolling bearing according to any of the preceding claims and an operating member supporting the rolling bearing.

10. A method of manufacturing a rolling bearing, the rolling bearing comprising: an inner ring; an outer ring; and at least one row of rolling elements radially arranged between the rolling paths formed on the rings, characterized in that an anti-wear ring is mounted against the outer face of one of the rings, the anti-wear ring comprising at least one pillar portion so as to extend it locally through a cylindrical or polygonal groove provided within the thickness of the ring, at least heating the pillar portion and locally pushing the material of the pillar portion in the direction of the inner face of the ring opposite to the outer face to ensure that the anti-wear ring remains on the ring.