CN117948347A

CN117948347A - Bearing

Info

Publication number: CN117948347A
Application number: CN202211348487.3A
Authority: CN
Inventors: 聂骁; 刘鑫; 吴丽娟; 鲁南
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2024-04-30

Abstract

The invention relates to a bearing, which is provided by the invention and is used for being assembled on a charged seat body, and comprises an outer ring and an insulating shell coated on the outer surface of the outer ring, wherein a first annular groove extending along the circumferential direction of the outer ring is arranged on the outer surface of the insulating shell, a filling material is arranged in the first annular groove, the friction coefficient of the filling material is larger than that of the insulating shell, and the filling material protrudes out of the first annular groove, so that the filling material can be tightly contacted with the charged seat body. By the arrangement, the bearing provided by the invention can reduce fretting wear between the outer ring and the bearing seat, and avoid the problem of temperature rise of the bearing caused by fretting wear.

Description

Bearing

Technical Field

The present invention relates to a bearing.

Background

The bearing comprises an inner ring, an outer ring and rolling bodies arranged between the inner ring and the outer ring, wherein the inner ring and the outer ring are annular pieces, the outer ring is fixedly arranged on a bearing seat under normal conditions, and the inner ring is sleeved on the periphery of the shaft.

In some live application scenarios, in order to avoid the problem that the external charging device and the bearing form a conductive path, and thus cause electric erosion to the inner and outer ring raceways or rolling bodies of the bearing, in the related art, the outer ring of the bearing is coated with a layer of insulating shell, and the insulating shell is separated between the bearing seat and the outer ring, so that the formation of the conductive path is avoided.

The insulating shell is made of insulating plastic, strength is lower than that of metal, friction coefficient is small, fretting wear is easy to occur between the outer ring of the bearing and the bearing seat, and temperature of the bearing is increased.

Disclosure of Invention

The invention aims to provide a bearing, which can reduce fretting wear between an outer ring and a bearing seat and avoid the problem of temperature rise of the bearing caused by fretting wear.

The bearing comprises an outer ring and an insulating shell coated on the outer surface of the outer ring, wherein a first annular groove extending along the circumferential direction of the outer ring is formed in the outer surface of the insulating shell, a filling material is arranged in the first annular groove, the friction coefficient of the filling material is larger than that of the insulating shell, and the filling material protrudes out of the first annular groove so that the filling material can be tightly contacted with the electrified seat.

According to the bearing provided by the invention, the insulating shell comprises the circumferential surface and a pair of axial end surfaces, the circumferential surface corresponds to the circumferential surface of the outer ring, the pair of axial end surfaces corresponds to the pair of axial opposite surfaces of the outer ring one by one, and the first annular groove is arranged on the circumferential surface of the insulating shell.

According to the bearing provided by the invention, the filling material is constructed into an annular structure, and the outer peripheral surface of the annular structure is provided with a grain structure for increasing friction.

According to the bearing provided by the invention, the filling material is rubber.

According to the bearing provided by the invention, the insulating shell is formed on the outer surface of the outer ring through an injection molding or mould pressing process, and the filling material and the insulating shell form an integrated structure through the injection molding or mould pressing process.

According to the bearing provided by the invention, at least two first annular grooves are formed, and the at least two first annular grooves are axially distributed on the circumferential surface of the insulating shell.

According to the bearing provided by the invention, the second annular groove extending along the circumferential direction is formed in the outer circumferential surface of the outer ring, and the part of the insulating shell corresponding to the second annular groove is embedded into the second annular groove.

According to the bearing provided by the invention, the first annular groove corresponds to the second annular groove, and the bottom of the groove of the first annular groove is embedded into the second annular groove.

According to the bearing provided by the invention, the second annular groove extending along the circumferential direction is arranged on the outer circumferential surface of the outer ring, the first annular groove is overlapped with the second annular groove, the first annular groove and the second annular groove are communicated in the depth direction, and the filling material is filled in the first annular groove and the second annular groove.

According to the bearing provided by the invention, the pair of axial end surfaces of the insulating shell are respectively provided with the third annular groove extending along the circumferential direction, the insulating shell is embedded in the third annular groove, and the bottom width of the third annular groove is larger than the width of the opening part.

In the technical scheme provided by the invention, the bearing is used for being assembled on the electrified seat body, the electrified seat body can be a bearing seat, and in order to prevent the bearing from forming a current path, the outer surface of the outer ring is coated with the insulating shell, the insulating shell plays a role in insulating the outer ring and the bearing seat, and the bearing seat and the outer ring form the current path. Further be provided with along its circumference first ring channel that extends at insulating shell surface, be provided with the filler material in the first ring channel, the coefficient of friction of filler material is greater than the coefficient of friction of insulating shell, and the filler material protrusion is in first ring channel to make filler material can form in close contact with electrified seat body. Because the friction coefficient of the filling material is larger than that of the insulating shell, the friction force formed between the filling material and the bearing seat is larger, and the arrangement can reduce micro-motion generated between the outer ring and the bearing seat, thereby reducing micro-motion abrasion and avoiding the problem of temperature rise of the bearing caused by micro-motion abrasion.

Drawings

Fig. 1 is a partial schematic view illustrating a bearing in which a filler material has a textured structure according to an embodiment of the present invention.

Fig. 2 is a schematic view showing the overall structure of a bearing in which a filler material has a textured structure according to an embodiment of the present invention.

Fig. 3 is a schematic view showing partial cooperation of a bearing with a bearing housing according to an embodiment of the present invention.

Fig. 4 is a partial schematic view showing a bearing according to an embodiment of the present invention.

Detailed Description

Specific embodiments according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and the accompanying drawings are provided to illustrate the principles of the invention and not to limit the invention to the preferred embodiments described, the scope of which is defined by the claims.

It should be noted that the direction or positional relationship referred to in the present specification is the direction or positional relationship based on the drawings, and is merely for convenience and simplicity of description, and does not indicate or imply that the apparatus referred to must have a specific direction, be configured in a specific direction, and thus should not be construed as limiting the invention.

Referring to fig. 1 to 4, the present embodiment provides a bearing for assembly on a charged housing, which may be embodied as a charged bearing housing 14, for example, a bearing for an electric motor, the bearing operating in a charged condition, in order to avoid forming a current path on the bearing, resulting in an electrolytic corrosion of the raceways or rolling bodies of the bearing. The bearing provided in this embodiment has an outer ring 11 with an insulating shell 12 coated on the outer surface thereof. The insulating shell 12 may be made of a thermoplastic or thermoset material that does not contain a conductive filler. The insulating housing 12 is coated on the outer ring 11 by injection molding or a mold pressing process, specifically, the insulating housing 12 is coated on the outer circumferential surface of the outer ring 11 and a pair of axial end surfaces.

In the present embodiment, the insulating housing 12 is provided with the first annular groove 111, and the extending direction of the first annular groove 111 coincides with the circumferential direction of the outer ring 11. The first annular groove 111 may be provided on the outer circumferential surface of the insulating case 12, or may be provided on the axial end surface of the insulating case 12. It should be understood that the outer circumferential surface of the insulating housing 12 described above corresponds to the outer circumferential surface of the outer ring 11, and the axial end surface of the insulating housing 12 corresponds to the axial end surface of the outer ring 11.

The first annular groove 111 is internally filled with a filling material 13 having a friction coefficient greater than that of the insulating case 12, and the filling material 13 may be formed in a unitary structure with the insulating case 12 through an injection molding or a mold pressing process. Specifically, the filling material 13 filled in the first annular groove 111 may be a rubber material having a friction coefficient greater than that of the insulating case 12. The filler material 13 protrudes out of the first annular groove 111 so that the filler material 13 can be in contact with the bearing housing 14. After the bearing is mounted on the bearing seat 14, the filling material 13 and the bearing seat 14 form close contact, as shown in fig. 3, and a high friction force is provided between the filling material 13 and the bearing seat 14, so that micro-motion generated between the outer ring 11 and the bearing seat 14 can be reduced, micro-motion abrasion is further reduced, and the problem of temperature rise of the bearing caused by micro-motion abrasion is avoided.

In a preferred embodiment, a first annular groove 111 is provided on the outer circumferential surface of the insulating housing 12. When the bearing is assembled on the bearing seat 14, the outer circumferential surface of the outer ring 11 is tightly matched with the inner circumferential surface of the bearing seat 14, and the first annular groove 111 is arranged on the outer circumferential surface of the insulating shell 12, so that the filling material 13 can be tightly matched with the inner circumferential surface of the bearing seat 14 under the action of radial tension of the bearing, as shown in fig. 3, and then micro-motion generated between the outer ring 11 and the bearing seat 14 can be further reduced.

In a further embodiment, in order to increase the friction between the filler material 13 and the bearing housing 14 and further reduce micro-movement between the bearing and the bearing housing 14, the filler material 13 is configured as an annular structure disposed around the insulating housing 12, and as shown in fig. 2, the outer circumferential surface of the annular structure is provided with a grain structure 131 for increasing friction. The outer circumferential surface of the annular structure corresponds to the inner circumferential surface of the bearing housing 14, and by providing the grain structure 131 on the outer circumferential surface of the annular structure, the friction force between the filler 13 and the bearing housing 14 can be further improved.

It should be noted that, the texture structure 131 may refer to the texture of the tire surface in the prior art, as shown in fig. 1, and the specific shape thereof will not be described herein.

The filler 13 may be rubber, which has a larger friction coefficient than that of plastic, and in this embodiment, is insulating rubber to avoid forming conductive paths.

In some embodiments, the first annular groove 111 provided on the insulating case 12 may be specifically two or more, for example, may be specifically two, three, or the like. A plurality of first annular grooves 111 are arranged in an axial direction on the circumferential surface of the insulating housing 12.

It should be noted that, the first annular groove 111 may penetrate the insulating housing 12, that is, the insulating housing 12 is divided into at least two sections along the axial direction of the bearing, and two adjacent sections are spaced apart to form the first annular groove 111 between two adjacent sections of the insulating housing 12. In other embodiments, the insulating housing 12 may be a continuous integral structure, and the outer circumferential surface of the insulating housing 12 has a downward recess, and the recess does not penetrate the insulating housing 12, and the recess forms the first annular groove 111.

In addition, it should be noted that a better binding force needs to be provided between the insulating housing 12 and the outer ring 11, so as to avoid fretting friction between the outer ring 11 and the insulating housing 12, which causes an increase in the temperature of the bearing. In view of this, the outer circumferential surface of the outer ring 11 is provided with a second annular groove 121 extending in the circumferential direction, and a portion of the insulating housing 12 corresponding to the second annular groove 121 is embedded inside the second annular groove 121. The insulation case 12 is inserted into the second annular groove 121 of the outer ring 11, and the coupling effect between the insulation case 12 and the outer ring 11 can be improved.

In some embodiments, the groove bottom of the first annular groove 111 on the insulating housing 12 is embedded in the second annular groove 121 of the outer ring 11. That is, the first annular groove 111 and the second annular groove 121 overlap.

In other embodiments, the first annular groove 111 of the insulating shell 12 extends through the insulating shell 12. That is, the first annular groove 111 has no bottom, the first annular groove 111 overlaps with the second annular groove 121 and both penetrate in the depth direction, and the filler 13 fills the inside of the first annular groove 111 and the second annular groove 121.

In a further embodiment, a pair of axial end surfaces of the insulating housing 12 are each provided with a third annular groove 112 extending in the circumferential direction, and the insulating housing 12 is embedded in the third annular groove 112. The coupling force of the insulating housing 12 with the outer ring 11 can be further improved by the engagement of the insulating housing 12 with the third annular groove 112. Preferably, the bottom width of the third annular groove 112 is greater than or equal to the width of the opening portion, for example, the third annular groove 112 may be a dovetail groove, so as to avoid the problem that the insulating case 12 is pulled out from the third annular groove 112.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

List of reference numerals

11. Outer ring

111. First annular groove

112. Third annular groove

12. Insulating shell

121. Second annular groove

13. Filling material

131. Texture structure

14. Bearing pedestal

Claims

1. A bearing for mounting on an electrified housing, wherein,

The bearing comprises an outer ring (11) and an insulating shell (12) which is coated on the outer surface of the outer ring (11), a first annular groove (111) which extends along the circumferential direction of the outer surface of the insulating shell (12) is formed in the outer surface of the insulating shell, a filling material (13) is arranged in the first annular groove (111), the friction coefficient of the filling material (13) is larger than that of the insulating shell (12), and the filling material (13) protrudes out of the first annular groove (111) so that the filling material (13) can be in tight contact with the electrified seat body.

2. The bearing according to claim 1, wherein the insulating housing (12) includes a circumferential surface corresponding to a circumferential surface of the outer ring (11) and a pair of axial end surfaces corresponding one-to-one to a pair of axially opposite surfaces of the outer ring (11), the first annular groove (111) being provided on the circumferential surface of the insulating housing (12).

3. Bearing according to claim 1, wherein the filler material (13) is configured as an annular structure, the outer circumferential surface of which is provided with a texture (131) for increasing friction.

4. Bearing according to claim 1, wherein the filler material (13) is rubber.

5. Bearing according to claim 1, wherein the insulating shell (12) is formed on the outer surface of the outer ring (11) by an injection or moulding process, and the filler material (13) forms a unitary structure with the insulating shell (12) by an injection or moulding process.

6. Bearing according to any one of claims 1 to 5, wherein the first annular grooves (111) are at least two, and at least two of the first annular grooves (111) are axially distributed on the circumferential surface of the insulating housing (12).

7. Bearing according to any one of claims 1 to 5, wherein a second annular groove (121) extending in the circumferential direction is provided on the outer circumferential surface of the outer ring (11), and a portion of the insulating housing (12) corresponding to the second annular groove (121) is embedded inside the second annular groove (121).

8. The bearing according to claim 7, wherein the first annular groove (111) corresponds to the second annular groove (121), and a groove bottom of the first annular groove (111) is embedded inside the second annular groove (121).

9. Bearing according to any one of claims 1 to 5, wherein a second annular groove (121) extending in the circumferential direction is provided on the outer circumferential surface of the outer ring (11), the first annular groove (111) overlaps the second annular groove (121) and both penetrate in the depth direction, and the filler material (13) is filled inside the first annular groove (111) and the second annular groove (121).

10. The bearing according to claim 2, wherein a pair of axial end surfaces of the insulating housing (12) are each provided with a third annular groove (112) extending in a circumferential direction, the insulating housing (12) is embedded in the third annular groove (112), and a bottom width of the third annular groove (112) is larger than a width of an opening portion.