Rolling bearing comprising a sealing flange

Abstract

Rolling bearing comprising an outer ring (14), an inner ring (16), at least one series of rolling elements (18) arranged radially between the rings, at least one seal (22) forming a first sealing means attached to one of the rings (14) and cooperating with the other ring (16), and at least one sealing flange (26; 60) forming a second sealing means attached to the other ring (16) and axially offset with respect to the seal (22) on the outside of the bearing, characterized by the fact that The sealing flange (26; 60) comprises an annular mounting section (26a) which is mounted on the inner ring (16), an annular connecting section (26c) which radially extends the mounting section (26a), and a bearing section (26b) which forms an outer section or end section of the sealing flange (26; 60) and has an axially curved concave shape on the outside and an axially convex shape on the inside, such that only the bearing section (26b) of the sealing flange (26; 60) is mounted in contact with the seal (22), and In the area of ​​the support section (26b) at least one of the first and second sealing means comprises at least two annular ribs (50) which are mounted in axial contact with the respective other sealing means, wherein at least one closed annular space (52) is bounded by the ribs (50) and the other sealing means, wherein at least one lubricant is arranged in the space (52).

Description

[0001] The present invention relates to the field of rolling bearings and in particular those used in automotive or industrial applications.

[0002] In a rolling bearing, one or more seals are generally used to retain the lubricant, such as grease, inside the bearing and to limit the ingress of dirt particles. Generally, such seals are mounted on one of the bearing rings and interact with the other ring to form a dynamic seal. Patent application WO 2010 / 133 240 A1 (SKF) describes a rolling bearing comprising two seals mounted on the outer ring, each with an inner lip that is in frictional contact with the inner ring. The bearing further comprises two sealing flanges mounted on the inner ring, each with an outer lip of its associated seal rubbing against it.

[0003] The use of such a flange axially on each side of the bearing, interacting with the outer lip of the associated seal, makes it possible to limit the arrival of dirt particles at the inner lip of the seal, which is in frictional contact with the inner ring. However, the contact pressure exerted on the flange by the outer elastomer lip of each associated seal tends to decrease over time and in the event of angular misalignment of one of the rings relative to the other after the bearing has been mounted. This can impair the sealing properties of the bearing during operation.

[0004] The object of the present invention is to eliminate this disadvantage.

[0005] More precisely, the object of the invention is to provide a rolling bearing that has an improved seal.

[0006] Furthermore, it is an object of the present invention to provide a rolling bearing that is simple to manufacture and assemble.

[0007] In one embodiment, the rolling bearing comprises an outer ring, an inner ring, at least one series of rolling elements arranged radially between the rings, at least one seal forming a first sealing means attached to one of the rings and cooperating with the other ring, and at least one sealing flange forming a second sealing means attached to the other ring and axially offset with respect to the seal on the outside of the bearing.

[0008] The sealing flange itself comprises an annular mounting section that is mounted on the inner ring, an annular connecting section that radially extends the mounting section, and a bearing section that forms an outer section or end section of the sealing flange and has an axially curved concave shape on the outside and an axially convex shape on the inside, so that only the bearing section of the sealing flange is mounted in contact with the seal 22.

[0009] Furthermore, at least one of the first and second sealing elements in the bearing area comprises at least two annular ribs to which the other sealing element is mounted in axial contact. At least one closed annular space is bounded by the ribs and the other sealing element. At least one lubricant is arranged in this space.

[0010] The axial contact between the ribs of one sealant and the other sealant limits the penetration of dirt particles between them. Furthermore, this annular space, radially arranged between the ribs and containing the lubricant, ensures the maintenance of good sealing properties over time in the contact zone of the two sealants. It limits the number of dirt particles that reach the section of the sealant that interacts with the other ring to form a dynamic seal.

[0011] In a special design, the flange is at least partially elastically deformable in the axial direction, whereby the flange is deformed axially by the axial contact with the seal.

[0012] The axial deformation of the flange, combined with its elastic properties, facilitates the maintenance of axial contact with the gasket. In response to the flange's deformation against its elasticity, the flange exerts a permanent axial preload force on the gasket. The space defined by the ribs and other sealing elements is kept permanently closed. This promotes the maintenance of good sealing characteristics.

[0013] Preferably, the thickness of each rib decreases towards its free end, which is in axial contact with the other sealing element. This reduces the frictional torque between the two sealing elements.

[0014] In one design, the ribs extend axially. The ribs can be identical to each other. Advantageously, the ribs and the sealant are formed in one piece. In another design, each rib has a triangular cross-section.

[0015] In one embodiment, the ribs are formed on an outer side surface of the gasket. Alternatively, or in combination, the ribs are formed on an inner side surface of the flange. The gasket can comprise at least one gasket lining that defines the outer side surface. In one embodiment, the gasket includes a reinforcing insert that is at least partially covered by the gasket lining.

[0016] Preferably, the sealing surface is made of a soft material, and the flange is made of a rigid material. The sealing flange can be made of a metallic material. This facilitates the distribution of heat generated by the sliding axial contact between the flange and the associated gasket.

[0017] Preferably, the outer side surface of the seal is axially offset on the inside of the bearing in relation to a front face of the ring.

[0018] The flange can include a section for bearing on the gasket, which has an axially convex shape on the gasket side. This reduces the frictional torque between the gasket and the associated flange. Furthermore, it prevents any contact between a sharp end edge of the flange's bearing section and the gasket, thus avoiding any damage to the gasket.

[0019] Preferably, the flange comprises a mounting section for attaching the flange to the other ring and a connecting section that joins the mounting section and the bearing section in contact with the seal, wherein at least the connecting section is elastically deformable in the axial direction. The connecting section may extend inwards towards the seal. In one embodiment, the connecting section has a curved shape.

[0020] In one embodiment, the flange comprises at least one corrugation, separate from the bearing section, which extends axially. The bearing section can extend axially on the outside of the bearing or, alternatively, axially on the inside of the bearing.

[0021] Preferably, the seal is axially offset on the inside of the bearing with respect to a front face of the ring. In one embodiment, the flange can be mounted axially directly on a front face of the ring.

[0022] The present invention will be better understood by studying the detailed description of embodiments, which are given as examples that are by no means limiting and are illustrated by the accompanying drawings, wherein: - Fig. 1 is a half axial sectional view of a rolling bearing according to a first embodiment of the invention; - Fig. 2 a detailed view from Fig. 1 is; - Fig. 3 a detailed view of a rolling bearing according to a second embodiment of the invention; - Fig. 4 is a half axial sectional view of a rolling bearing according to a third embodiment of the invention; - Fig. 5 a detailed view from Fig. 4 is.

[0023] In Fig. Figure 1 comprises a rolling bearing 10 with an axis 12, an outer ring 14, an inner ring 16, a plurality of rolling elements 18, which here are in the form of balls arranged radially between the rings, and a housing 20 for maintaining the regular circumferential spacing of these rolling elements. The bearing 10 axially includes an annular seal 22, 24 on each side to close the radial space between the outer 14 and inner rings 16, and an annular sealing flange 26, 28 that rests on the seal 22, 24 on the outside of the bearing. In the illustrated embodiment, the seals 22, 24 are attached to the outer ring 14, while the sealing flanges 26, 28 are attached to the inner ring 16.

[0024] The outer ring 14 comprises a cylindrical axial outer surface 14a, a cylindrical bore 14b, two radially opposite front surfaces 14c, 14d which axially define the bore and the outer surface, and a rolling path formed on the bore 14b which has a concave inner profile in cross-section adapted to the rolling elements 18, the rolling path being directed radially inwards. The outer ring 14 also comprises two annular grooves 14e, 14f formed on the bore 14b and extending radially outwards. The grooves 14e, 14f are each located near the front surfaces 14c, 14d. Each groove 14e, 14f is located axially between the rolling elements 18 and one of the front surfaces 14c, 14d. The grooves 14e, 14f are symmetrical to each other and to a radial center plane that passes through the center of the bearing 10.

[0025] The inner ring 16 comprises a cylindrical bore 16a, a cylindrical axial outer surface 16b, two radially opposite front surfaces 16c, 16d which axially delimit the bore and the outer surface, and a rolling path formed on the outer surface 16b which has a concave inner profile in cross-section adapted to the rolling elements 18, the rolling path being directed radially inwards. The housing 20 is arranged radially in the radial space which is delimited by the outer surface 16b of the inner ring and the bore 14b of the outer ring.

[0026] The inner ring 16 also includes two annular grooves 16e, 16f, which are formed on the outer surface 16b and extend radially inwards. The grooves 16e, 16f are each located near the front surfaces 16c, 16d. The grooves 16e, 16f are symmetrical to each other and to the radial center plane of the bearing 10. The groove 16e, 16f is radially opposite the corresponding groove 14e, 14f.

[0027] The outer rings 14 and inner rings 16 are concentric. In the illustrated embodiment, the rings are solid. A "solid ring" is understood to be a ring whose shape is obtained by machining (turning, grinding) from tubes, bars, forged and / or rolled preforms.

[0028] Each seal 22, 24 is arranged radially between the outer 14 and inner rings 16 and attached to the outer ring, being laterally positioned against the rolling elements 18. Each seal 22, 24 is arranged within one of the grooves 14e, 14f of the outer ring. Each seal 22, 24 is entirely located within the radial space bounded by the outer 14 and inner rings 16. Each seal 22, 24 is axially offset on the inside of the bearing 10 with respect to the corresponding side surface 14c, 14d of the outer ring.

[0029] In this embodiment, the seals 22, 24 are identical to each other and symmetrical to the radial center plane of the bearing 10. Since the seals 22, 24 are identical here, only one of them is described.

[0030] The seal 22 comprises a rigid annular fitting or insert 30 and a soft annular sealing layer 32, which is attached to the insert. The insert 30 is made of a rigid material, for example, a metallic material or a thermoplastic, in particular polyamide. The insert 30 forms a reinforcing insert for the sealing layer 32. The sealing layer 32 is molded or vulcanized onto the insert 30. The sealing layer 32 is made of a soft material, for example, an elastomer such as nitrile rubber, or a thermoplastic elastomer.

[0031] The sealing lining 32 covers an outer surface of the insert 30. The sealing lining 32 covers an outer side surface of the insert 30. The sealing lining 32 comprises an annular outer side surface 36, which is axially oriented towards the outside of the bearing 10 in the direction of the associated flange 26. The outer side surface 36 is axially offset on the inside of the bearing 10 with respect to the front surfaces 14c, 16c of the outer and inner rings. The side surface 36 of the sealing lining forms the outer side surface of the seal 22. The side surface 36 is flat. The side surface 36 extends radially. An inner side surface 38 of the seal, which is opposite side surface 36, is axially oriented towards the inside of the bearing in the direction of the rolling elements 18. The inner side surface 38 is bounded by the insert 30.

[0032] The sealing layer 32 forms two radially opposite sealing sections, which provide a static seal with the outer ring 14 and a dynamic seal with the inner ring 16, respectively. "Static seal" refers to a seal formed between two parts without relative movement, and "dynamic seal" refers to a seal between two parts that exhibit relative movement.

[0033] The outer sealing section of the sealing lining 32 is firmly inserted into the groove 14e of the outer ring 14 to secure the seal 22 to the ring. In the area of ​​the groove 14e, the outer sealing section and the groove are form-complementary, thus providing a means of securing the seal 22 to the outer ring 14. The outer sealing section surrounds radially and axially the large-diameter free edge of the insert 30, ensuring that only the sealing lining 32 is in contact with the outer ring 14. This arrangement promotes a secure retention of the seal 22 in its position within the groove 14e through frictional engagement.

[0034] The inner sealing section of the sealing lining 32 comprises first and second concentric annular inner lips 32a, 32b, which extend axially towards the interior of the bearing. The inner lip 32b bears axially against a radial wall of the groove 16e of the inner ring. The inner lip 32a has a larger diameter than the inner lip 32b and radially surrounds the outer surface 16b of the inner ring to form a narrow labyrinth-type passage with the outer surface.

[0035] As more clearly in Fig. As shown in Figure 2, the outer side surface 36 of the seal comprises a plurality of annular ribs 50 that extend outwards towards the sealing flange 26. The flange 26 is mounted axially against the ribs 50.

[0036] The ribs 50 extend from the outer side surface 36 and axially contact an inner side surface 40 of the flange. The ribs 50 extend axially. The ribs 50 are axially located on the opposite side of the inner lip 32b ( Fig. 1) arranged in relation to the outer side surface 36. The ribs 50 and the lip 32b are arranged axially on both sides of the side surface 36. The ribs 50 are offset axially outwards towards the bearing 10 in relation to the lip 32b. In the illustrated embodiment, the ribs 50 are offset radially outwards towards the bearing 10 in relation to the lip 32b. The ribs 50 are concentric and identical to each other. In the illustrated embodiment, there are six ribs 50. As an alternative, it is possible to provide a different number of ribs, provided that at least two ribs remain. Here, the ribs 50 are spaced regularly apart from each other in the radial direction. The ribs 50 are integral with the lining 32 of the seal. In the illustrated embodiment, the thickness of each rib 50 decreases from the outer side surface 36 of the seal towards its free end, which is in axial frictional contact with the flange 26.The free end of each rib 50 has a triangular shape in cross-section to reduce the frictional torque between the seal 22 and the flange 26.

[0037] With renewed reference to Fig. In the embodiment 1, each sealing flange 26, 28 is axially offset relative to the associated seal 22, 24 on the outside of the bearing. Each sealing flange 26, 28 is mounted axially against one of the front surfaces 16c, 16d of the inner ring and bears axially against the sealing surface 32 of the associated seal on the outside of the bearing 10. The flanges 26, 28 are symmetrical to each other and to the radial transverse plane that passes through the center of the bearing 10. Since the flanges 26, 28 are identical in the illustrated embodiment, only one of them is described here.

[0038] The flange 26 is manufactured in one piece. The flange 26 is made of a rigid material, preferably a metallic material, advantageously from a sheet metal blank produced by cutting and deep drawing. Alternatively, the flange 26 could be made of another rigid material, for example a plastic such as polyamide.

[0039] The flange 26 is attached to the inner ring 16 and extends radially towards the outer ring 14. The flange 26 is attached to the inner ring 16 by any suitable means, for example, by gluing or welding. The flange 26 is mounted axially in contact with the front surface 16c of the inner ring. The flange 26 is attached to this front surface 16c. In the illustrated embodiment, the flange 26 is mounted in direct contact with the inner ring. Alternatively, it would be possible to arrange an intermediate element axially between the inner ring 16 and the flange 26.

[0040] The flange 26 comes into axial contact with the outer side surface 36 of the seal. In the illustrated embodiment, the flange 26 is mounted axially on the side surface 36 near the outer sealing section of the sealing lining 32. The flange 26 comprises the inner side surface 40, which is axially aligned with the side of the seal 22 and is connected to the ribs 50 ( Fig. 2) the seal comes into contact with the bearing, and an outer side surface 42 which is axially aligned with the outside of the bearing. The flange 26 is mounted in direct contact with the seal 22.

[0041] The flange 26 comprises an annular mounting section 26a, which is axially mounted against the front surface 16c of the inner ring, and a bearing section 26b on the seal 22, also annular in shape and in axial contact with the ribs 50 of the seal. The mounting section 26a has a radial shape and forms an inner section of the flange. The bearing section 26b forms an outer or end section of the flange. In the illustrated embodiment, the bearing section 26b has an axially curved concave shape on the outside and an axially convex shape on the inside. Only the bearing section 26b of the flange is mounted in contact with the seal 22. The flange 26 also comprises an annular connecting section 26c, which extends between the mounting sections 26a and the bearing sections 26b and is connected to these sections.The connecting section 26c extends radially the mounting section 26a and is radially extended by the support section 26b. The connecting section 26c is designed to be flexible and elastically deformable in the axial direction. The connecting section 26c extends inwards towards the seal 22. In the illustrated embodiment, the connecting section 26c has a shape curved axially towards the interior of the bearing 10.

[0042] A corrugation 44 is formed on the connecting section 26c to further promote the flexible and axially elastically deformable nature of this section. The corrugation 44 extends axially on the outside of the bearing 10. In the illustrated embodiment, the corrugation 44 extends from the large-diameter edge of the mounting section 26a of the flange. Here, the flange 26 comprises a single corrugation 44. Alternatively, the flange 26 could comprise a plurality of successive corrugations in the radial direction or other shapes that promote the elastic deformation of the connecting section 26c.

[0043] As previously mentioned, the flange 26 is mounted axially against the ribs 50 of the gasket ( Fig. 2) The bearing section 26b of the flange rests axially against the ribs 50. An annular space 52 is radially bounded between each pair of successive ribs 50. Each space 52 is axially bounded by the flange 26 and the gasket 22. Each space 52 is axially bounded by the bearing section 26b of the flange and the gasket 22. Each space 52 is axially bounded by the inner side surface 40 of the flange 26 and the outer side surface 36 of the gasket. At least one lubricant (not shown), for example, grease, is located inside each space 52. Each pair of ribs 50, together with the flange 26, defines a space 52 that forms a reservoir containing the lubricant. The lubricant present inside each space 52 forms an annular bead.

[0044] The axial contact between the flange 26 and the ribs 50 of the seal 22 limits the ingress of dirt particles between the flange and the seal. Furthermore, the enclosed spaces 52, defined by the ribs 50 of the seal and the flange 26 and filled with lubricant, promote a good seal in this zone. A seal is formed upstream of the dynamic sealing section of the seal 22, interacting with the inner ring 16. This limits the arrival of dirt particles at the dynamic sealing section of the seal.

[0045] In the illustrated embodiment, the flange 26 is deformed axially outwards towards the bearing by the contact between the support section 26b and the ribs 50 of the seal 22. The connecting section 26c of the flange is deformed against its own elasticity. The flange 26 is axially preloaded by the contact with the seal 22. In the preloaded state, the axial distance between the fastening section 26a and the support section 26b on the inner side 40 of the flange is less than the axial distance between the sections in the free or unloaded state of the flange.

[0046] Due to its elasticity, the connecting section 26c of the flange tends to return to its unstressed and axially unloaded position. The bearing section 26b of the flange thus exerts a permanent axial preload force on the ribs 50 of the seal 22. This facilitates the maintenance of the sliding axial contact between the flange 26 and the ribs 50 of the seal 22 and helps to retain the lubricant inside the spaces 52. Fig. The embodiment shown in Figure 3, in which the identical elements bear the same reference numerals, differs from the first described example only in the reversed arrangement of the ribs 50, which are formed on the flange 26 and on which the seal 22 is axially mounted. The ribs 50 extend inwards towards the seal 22. The ribs 50 extend from the inner side surface 40 of the flange and contact the outer side surface 36 of the seal axially. The ribs 50 are formed on the bearing section 26b of the flange.

[0047] In comparison to the first example shown, the embodiment of the Fig. 4 and Fig.5, in which the identical elements bear the same reference numerals, mainly by the design of the bearing's sealing flanges 60, 62. The mounting of each flange 60, 62 on the inner ring 16 and the associated seal 22, 24 is identical to that described in the first embodiment. The relative arrangement of each flange 60, 62 with respect to the associated seal 22, 24 differs only in that the flange is mounted axially against the ribs of the seal near the inner sealing section of the sealing lining.

[0048] Since the flanges 60 and 62 are identical in this embodiment, only one of them is described here. The flange 60 is manufactured in three separate parts. The flange 60 comprises an annular mounting section 64, which is mounted axially against the front surface 16c of the inner ring; a bearing section 66 on the seal 22, also annular in shape and in axial contact with the ribs 50 of the seal; and a support section 68 of the bearing section. The ribs 50 of the seal bear axially against the inner side surface of the flange. The ribs 50 are mounted axially against the bearing section 66 of the flange. In this embodiment, there are four ribs 50 and three closed annular spaces 52.

[0049] The mounting section 64 has a radial shape and forms an inner section of the flange. The bearing section 66 forms an outer or end section of the flange. In the illustrated embodiment, the bearing section 66 has a curved, axially concave shape on the outside and an axially convex shape on the inside. The bearing section 66 is dome-shaped. The bearing section 66 is mounted axially in contact with the ribs 50 of the gasket. Only the bearing section 66 of the flange is mounted in contact with the gasket 22. The mounting section 64 and the bearing section 66 are each made of a rigid material, for example, a metallic material, advantageously a sheet metal blank produced by cutting and deep drawing.Alternatively, the fastening section 64 and the support section 66 could each be made of a different rigid material, for example plastic such as polyamide.

[0050] The support section 68 extends between the mounting sections 64 and the bearing sections 66. The support section 68 forms a connecting section that links the mounting sections 64 and the bearing sections 66. The support section 68 covers the large-diameter edge of the mounting section 64 and the outer side surface of the support section 66. The inner side surface of the support section 66 comes into axial contact with the ribs 50 of the seal.

[0051] The support section 68 is designed to be flexible and elastically deformable in the axial direction. The connecting section 68 extends inwards towards the seal 22. In the illustrated embodiment, the support section 68 has a curved, axially concave shape on the outside and an axially convex shape on the inside. The support section 68 is formed or vulcanized onto the fastening section 64 and the bearing section 66. The support section 68 is made of a flexible material, for example, an elastomer such as nitrile rubber or a thermoplastic elastomer.

[0052] The support section 68 is deformed axially outwards towards the bearing by the contact between the support section 66 and the ribs 50 of the seal 22. The support section 68 is deformed against its own elasticity. The flange 26 is axially preloaded by the contact with the seal 22. In response to the deformation of the support section 66, it exerts a permanent axial preload force on the ribs 50 of the seal 22.

[0053] In this embodiment, the ribs 50 are formed on the seal 22. As an alternative, it would be possible to form the ribs 50 on the bearing section 66 of the flange and to provide axial contact between these ribs and the outer side surface 36 of the seal.

[0054] In the illustrated embodiments, each sealing flange is attached to one of the front surfaces of the inner ring. Alternatively, it would be possible to attach each flange inside an annular groove that is recessed in the bore of the inner ring, for example by means of a crimped connection.

[0055] In the illustrated embodiments, each seal comprises two parts: a reinforcing insert and a sealing surface, which is attached to this insert and provided with at least one friction lip that interacts with the inner ring to form a dynamic seal. Alternatively, the sealing surface could comprise only one or more labyrinth-type lips that interact with the inner ring. In a further variant, it would be possible to provide a seal comprising only one part, namely the reinforcing insert or the sealing surface.

[0056] In the illustrated embodiments, each flange is elastically deformable in the axial direction to facilitate the maintenance of axial contact between the ribs and the flange or the associated gasket. As an alternative, however, it would be possible to provide flanges that are not elastically deformable.

[0057] In the illustrated embodiments, each gasket or flange includes ribs to define the annular spaces filled with lubricant. As an alternative, it would be possible to provide ribs on each gasket in axial contact with the associated flange and simultaneously ribs on the flange in axial contact with the gasket.

[0058] In the illustrated embodiments, the sealing flange is attached to the inner ring, and the associated seal is attached to the outer ring. Alternatively, it would be possible to provide a reverse arrangement with the seal attached to the inner ring and the associated flange attached to the outer ring.

Claims

[1] Rolling bearing comprising an outer ring (14), an inner ring (16), at least one series of rolling elements (18) arranged radially between the rings, at least one seal (22) forming a first sealing means attached to one of the rings (14) and cooperating with the other ring (16), and at least one sealing flange (26; 60) forming a second sealing means attached to the other ring (16) and axially offset with respect to the seal (22) on the outside of the bearing, characterized by , that The sealing flange (26; 60) comprises an annular mounting section (26a) which is mounted on the inner ring (16), an annular connecting section (26c) which radially extends the mounting section (26a), and a bearing section (26b) which forms an outer section or end section of the sealing flange (26; 60) and has an axially curved concave shape on the outside and an axially convex shape on the inside, such that only the bearing section (26b) of the sealing flange (26; 60) is mounted in contact with the seal (22), and In the area of ​​the support section (26b) at least one of the first and second sealing means comprises at least two annular ribs (50) which are mounted in axial contact with the respective other sealing means, wherein at least one closed annular space (52) is bounded by the ribs (50) and the other sealing means, wherein at least one lubricant is arranged in the space (52). [2] Bearing according to claim 1, wherein the flange (26; 60) is at least partially elastically deformable in the axial direction, the flange being deformed axially by the axial contact with the seal (22). [3] Bearing according to claim 1 or 2, wherein the thickness of each rib (50) decreases in the direction of its free end which is in axial contact with the other sealing means. [4] Bearing according to one of the preceding claims, wherein the ribs (50) extend axially. [5] Bearing according to one of the preceding claims, wherein the ribs (50) are identical to each other. [6] Bearing according to one of the preceding claims, wherein the ribs (50) are integral with the sealing means. [7] Bearing according to one of the preceding claims, wherein the ribs (50) are formed on an outer side surface (36) of the seal (22). [8] Bearing according to claim 7, wherein the seal comprises at least one sealing layer (32) that limits the outer side surface (36). [9] Bearing according to one of the preceding claims, wherein the ribs (50) are formed on an inner side surface (40) of the flange (26; 60).

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