WO2023133746A1

WO2023133746A1 - Bearing

Info

Publication number: WO2023133746A1
Application number: PCT/CN2022/071714
Authority: WO
Inventors: 黄运生; 马子魁; 王远艰; 周新
Original assignee: 舍弗勒技术股份两合公司; 黄运生
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2023-07-20

Abstract

A bearing, comprising an outer ring (1), an inner ring (2), a roller (3), a cage (4) and a conductive assembly (5). The conductive assembly (5) is fixed on the cage (4) and the conductive assembly (5) is in contact with both the outer ring (1) and the inner ring (2), such that the outer ring (1) and the inner ring (2) are in electrical connection by means of the conductive assembly (5). The conductive assembly (5) can be mounted on the cage (4) on the basis of the design of the original bearing structure not being substantially changed, such that the inner ring (2) and the outer ring (1) of the bearing are not in electrical connection by means of the roller (3). Moreover, since the conductive assembly (5) is fixed on the cage (4), the relative sliding linear velocity of the contact points where the conductive assembly (5) comes in contact with the inner ring (2) and the outer ring (1) is relatively low, such that failure is not prone to occurring.

Description

bearing

technical field

This application relates to the field of bearings.

Background technique

Bearings are used in a wide variety of mechanical equipment, and vehicles are one such typical mechanical equipment. As the process of vehicle electrification is accelerating, more and more motors are used in vehicles. This can lead to the presence of voltages in the bearings used in the support system of the vehicle, so that the current may be conducted from the shaft, the inner ring of the bearing to the outer ring of the bearing through the roller contact, and further to the bearing housing, which may be generated at the raceway. Electrocorrosion can cause serious damage to the bearing. In addition, when the bearing is running normally, there is an oil film between the roller and the raceway to generate lubrication, which helps to reduce the friction between the roller and the inner and outer rings, and the current in the bearing will cause the oil film to be hit wear, thereby making the lubrication effect ineffective.

Among the existing solutions, one is to use a ceramic bearing design to suppress the electrical corrosion of the raceway, but this will greatly increase the cost of the bearing. The other is to provide an insulating coating on the surface of the outer ring and the inner ring, but the material used for the insulating coating is relatively hard and brittle, and it is easy to break during installation, resulting in failure. Moreover, since the thermal expansion coefficients of the coating material used for the insulating coating and the material of the bearing itself are quite different, when the bearing temperature changes, the two materials may separate, causing the insulating coating to dissipate from the bearing. fall off. In order to overcome the problems of the above two schemes, in the US patent No. US 10190640 B2, the name of which is a bearing integrated with a shunt, it is proposed to set a flexible conductive unit between the inner ring and the outer ring of the bearing to realize the electric current. Sexually connected programs. Although the flexible conductive unit does not greatly increase the cost, in this technical solution, it is necessary to fix the conductive unit on the outer ring or inner ring and greatly change the original bearing structure design, and the relative sliding speed between the conductive element and the contact surface is relatively large , so there is still a risk of failure.

Contents of the invention

The present application is made based on the defects of the above-mentioned prior art. One purpose of this application is to provide a new type of bearing, which can realize the structure that the inner ring and outer ring of the bearing are not electrically connected through the rollers without basically changing the original bearing structure design, and the structure is not easy invalidated.

In order to realize the purpose of the above invention, the present application adopts the following technical solutions.

The application provides a bearing, which includes an outer ring, an inner ring, a roller, a cage and a conductive component, the conductive component is fixed to the cage, the conductive component is connected to the outer ring and the inner ring are in contact with each other, so that the outer ring and the inner ring are electrically connected through the conductive component.

In an optional solution, the conductive component includes at least one conductive unit, and the conductive unit is in contact with both the inner ring and the outer ring.

In another optional solution, the conductive unit includes a conductive base, a first elastic conductive part and a second elastic conductive part, the conductive base is fixed on the holder, and the first elastic conductive part is installed on the The conductive base is in contact with the outer ring, and the second elastic conductive part is mounted on the conductive base and in contact with the inner ring.

In another optional solution, the conductive component includes a plurality of conductive units and a conductive ring, the plurality of conductive units are electrically connected through the conductive ring, and at least a part of the plurality of conductive units conducts electricity The unit is in contact with the outer ring, and at least a part of the plurality of conductive units is in contact with the inner ring.

In another optional solution, among the plurality of conductive units, the conductive unit in contact with the outer ring includes a conductive base and a first elastic conductive part, the conductive base is fixed to the cage, and the The first elastic conductive part is installed on the conductive base and is in contact with the outer ring, and the conductive unit in the plurality of conductive units that is in contact with the inner ring includes a conductive base and a second elastic conductive part, and the conductive base Fixed to the cage, the second elastic conductive part is mounted on the conductive base and in contact with the inner ring.

In another optional solution, both the first elastic conductive part and the second elastic conductive part are conductive bundles including a plurality of conductive fibers.

In another optional solution, the first elastic conductive part is in contact with the rib of the outer ring of the outer ring, and the second elastic conductive part is in contact with the rib of the inner ring of the inner ring.

In another optional solution, the conductive base is roughly C-shaped, and has a hook structure formed by bending free ends toward each other, so as to realize fixing with the holder.

In another optional solution, the conductive base includes a first part, a second part, and a third part fixed to each other, and the second part and the third part face from both ends of the first part to The axial direction extends to one side, and the free ends of the second part and the third part are bent towards each other to form a hook structure.

In another optional solution, the cage includes side beams and multiple lintels, pockets and grooves are formed by the side beams and the multiple lintels, and the pockets are used to hold the The roller is used, the groove is recessed radially inward relative to the side beam and the lintel, and the conductive unit is clamped to a part of the side beam forming the groove.

In another optional solution, the pockets and the grooves are arranged alternately in the circumferential direction of the bearing.

In another optional solution, the conductive assembly includes a plurality of conductive units, and the plurality of conductive units are evenly distributed in the circumferential direction of the bearing.

By adopting the above technical solution, the present application provides a new type of bearing, which includes a conductive component fixed on the cage, and the conductive component is in contact with the outer ring and the inner ring, so as to realize the electrical conduction between the outer ring and the inner ring. Pass. In this way, the conductive component of the present application can be installed on the cage without basically changing the original bearing structure design, so as to realize the electrical conduction between the inner ring and the outer ring of the bearing without passing through the rollers. Moreover, since the conductive component is fixed to the cage, the relative sliding linear velocity of the contact point between the conductive component and the inner ring and the outer ring is relatively small, so failure is not easy.

Description of drawings

FIG. 1A is a schematic perspective view showing the structure of a bearing according to the first embodiment of the present application, in which a part of the structure of the outer ring is omitted.

Fig. 1B is a schematic front view showing the structure of the bearing in Fig. 1A, in which part of the structure of the outer ring is omitted.

FIG. 1C is a schematic perspective view showing an exploded structure of the bearing in FIG. 1A , in which part of the structure of the outer ring and the rollers are omitted.

FIG. 1D is a schematic diagram for explaining relative linear velocities at contact points where the conductive unit of the bearing in FIG. 1A contacts the inner ring and the outer ring.

Fig. 2 is a schematic front view showing the structure of a bearing according to a second embodiment of the present application, in which a part of the structure of the outer ring is omitted.

Explanation of reference signs

1 Outer ring 11 Outer ring rib 2 Inner ring 21 Inner ring rib 3 Roller 4 Cage 41 Side beam 42 Lintel 4h1 Pocket 4h2 Groove 5 Conductive component 51 Conductive unit 511 Conductive matrix 5111 Radial part (first part ) 5112 First axial part (second part) 5113 Second axial part (third part) 512 First elastic conductive part 513 Second elastic conductive part 52 Conductive ring

A axial R radial C circumferential.

Detailed ways

Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, but are not intended to exhaust all possible ways of the present application, nor are they used to limit the scope of the present application.

In this application, unless otherwise specified, "axial", "radial" and "circumferential" refer to the axial, radial and circumferential directions of the bearing, respectively. In addition, "one side in the axial direction" means the right side in FIG. 1C, and "the other side in the axial direction" means the left side in FIG. 1C.

The bearing according to the first embodiment of the present application will be described below with reference to the accompanying drawings.

(Bearing according to the first embodiment of the present application)

As shown in FIGS. 1A to 1C , the bearing according to the first embodiment of the present application is a ball bearing. The bearing includes an outer ring 1, an inner ring 2, a plurality of rollers 3, a cage 4 and a conductive component 5 assembled together.

In this embodiment, as shown in FIGS. 1A to 1C , both the outer ring 1 and the inner ring 2 have a ring shape, and the inner ring 2 is located radially inside the outer ring 1 and can rotate relative to the outer ring 1 . A storage space for holding a plurality of rollers 3 is formed between the raceway of the outer ring 1 and the raceway of the inner ring 2 . The plurality of rollers 3 are all spherical and held in the storage space by the cage 4 , and the plurality of rollers 3 are evenly distributed in the circumferential direction C at intervals. During the working process of the bearing, the roller 3 can roll in the raceway of the outer ring 1 and the raceway of the inner ring 2, and the parts of the outer ring 1 on both sides of the raceway are formed to prevent the roller 3 from falling out of the raceway. The outer ring rib 11, the parts of the inner ring 2 located on both sides of its raceway are formed as the inner ring rib 21 for preventing the roller 3 from falling out of the raceway, the outer ring rib 11 and the inner ring rib 21 are radially R facing each other.

In this embodiment, as shown in FIGS. 1A to 1C , the holder 4 may be formed of a non-conductive material such as resin. The cage 4 includes an annular side beam 41 and a plurality of cross beams 42 extending from the side beam 41 . The side beam 41 extends continuously along the circumferential direction C over the entire circumference. A plurality of cross beams 42 are distributed at intervals in the circumferential direction C, and one end of each cross beam 42 is fixed to the side beam 41 and extends along the axial direction A toward one side for a predetermined length. A plurality of pockets 4h1 distributed along the circumferential direction C are formed between the side beam 41 and the plurality of cross beams 42 . In this embodiment, each pocket 4h1 is correspondingly installed with a roller 3 . Moreover, as shown in FIG. 1A and FIG. 1C, pocket holes 4h1 are not formed between every two adjacent lintels 42, but alternately between every two adjacent lintels 42 in the circumferential direction C. The pocket 4h1 to which the roller 3 is mounted and the groove 4h2 to which the roller 3 is not mounted are formed in such a manner. In other words, one side of each web 42 is formed with pockets 4h1 and the other side is formed with grooves 4h2 so that the pockets 4h1 and the grooves 4h2 are alternately arranged in the circumferential direction C. As shown in FIG. The groove 4h2 is recessed toward the radially inner side relative to the side beam 41 and the cross beam 42, so that the groove 4h2 forms an escape space so that the hook structure formed by the conductive base 511 can smoothly hook the side beam 41, and the groove 4h2 also The weight of the cage 4 can be reduced.

In this embodiment, as shown in FIGS. 1A to 1C , the conductive component 5 is fixed to the cage 4, and the conductive component 5 is in direct contact with both the outer ring 1 and the inner ring 2, so that the outer ring 1 and the inner ring 2 pass through the conductive component. 5 electrical conduction. In this embodiment, the conductive assembly 5 includes a plurality of conductive units 51 and a conductive ring 52, the plurality of conductive units 51 are electrically connected through the conductive ring 52, and each conductive unit 51 is connected to the outer ring 1 and the inner ring 2. direct contact.

As shown in FIGS. 1A to 1C , a plurality of conductive units 51 are evenly arranged in the circumferential direction C. As shown in FIG. The conductive unit 51 includes a conductive base 511 , a first elastic conductive part 512 and a second elastic conductive part 513 assembled together. The conductive base 511 is fixed on the side beam 41 of the cage 4 . The first elastic conductive portion 512 is mounted on the radially outer end of the conductive base 511 and extends radially outward. The first elastic conductive portion 512 is in contact with the outer ring rib 11 . The second elastic conductive portion 513 is mounted on the radially inner end of the conductive base 511 and extends radially inwardly. The second elastic conductive portion 513 is in contact with the inner ring rib 21 . The conductive units 51 and the pockets 4h1 are alternately distributed in the circumferential direction C.

The conductive base 511 is fixed to the part of the side beam 41 other than the pocket 4h1 , that is, the part of the side beam 41 located in the groove 4h2 is clipped. As shown in FIG. 1C , the conductive base 511 includes a radial portion 5111 , a first axial portion 5112 and a second axial portion 5113 that are integrally formed. The first axial portion 5112 extends from the radially outer end of the radial portion 5111 to one side in the axial direction, the second axial portion 5113 extends from the radially inner end of the radial portion 5111 toward the axial side, and the first axial portion 5113 The free ends of both the portion 5112 and the second axial portion 5113 are bent towards each other to form a hook-like structure. In this way, the conductive base 511 can be fitted onto the side beam 41 of the cage 4 from the other side in the axial direction, so that the side beam 41 passes through the space surrounded by the radial portion 5111 , the first axial portion 5112 and the second axial portion 5113 , and enables the conductive base 511 to be fixed to the side beam 41 . That is to say, the conductive base 511 is configured in a substantially C-shape, and the free ends of the first axial portion 5112 and the second axial portion 5113 are bent toward each other to form a hook-shaped structure, so as to realize the connection with the cage 4. The clamping of the side beam 41 is fixed.

Both the first elastic conductive part 512 and the second elastic conductive part 513 may be conductive bundles including a plurality of conductive fibers. In this way, when the bearing is in the initial state of being installed in place, the first elastic conductive part 512 can have a certain amount of interference with the outer ring rib 11, and the first elastic conductive part 512 undergoes elastic deformation to obtain a certain preload, thereby ensuring that the first elastic conductive part 512 An elastic conductive part 512 can always be in direct contact with the outer ring rib 11; a second elastic conductive part 513 can have a certain amount of interference with the inner ring rib 21, and the second elastic conductive part 513 undergoes elastic deformation to obtain a certain preload , so as to ensure that the second elastic conductive portion 513 can always be in direct contact with the inner ring rib 21 . Further, the conductive fibers of the first elastic conductive part 512 and the second elastic conductive part 513 of these conductive units 51 can also have a certain rigidity, so that the radial movement of the cage 4 can be restrained to a certain extent, Prevent the cage 4 from colliding and rubbing against the outer ring 1 and the inner ring 2 .

As shown in FIGS. 1A to 1C , the conductive ring 52 can be fixed on the other axial side of the cross beam 42 of the cage 4 by bonding or welding, or can be fixed on the other side of the cross beam 42 of the cage 4 in the axial direction. A mounting groove is formed on one side, and the conductive ring 52 can be clamped and fixed in the mounting groove. Moreover, the conductive ring 52 is located between the radial portion 5111 of the conductive base 511 and the bridge 42 of the cage 4 , thereby preventing the conductive ring 52 from accidentally falling off when the multiple conductive units 51 are electrically connected.

By adopting the above-mentioned structural design, the bearing of the present application can conveniently install the conductive component 5 on the cage 4 of the bearing without changing the structural design of the original bearing, and can realize the connection between the outer ring 1 and the inner ring 2. Electrical conduction between. By arranging a plurality of conductive units 51 electrically connected through the conductive ring 52 , the failure of the conductive component 5 due to the movement and deformation of the cage 4 can be basically avoided.

The relative linear velocity at the contact point where the conductive unit 51 contacts the outer ring 1 and the inner ring 2 will be described below.

As shown in Fig. 1D, the case where the outer ring 1 is fixed (ω _o =0) and the inner ring 2 rotates is used as an example for illustration. In this case, the angular velocity ω _c of the cage 4 can be expressed as:

Among them, ω _i is the angular velocity of the inner ring 2.

The relative linear velocity V _ic of the contact point P1 between the conductive unit 51 and the raceway of the inner ring 2 can be expressed as:

Wherein, R _i is the radius of the raceway of the inner ring 2 .

The relative linear velocity V _oc of the contact point P2 between the conductive unit 51 and the raceway of the outer ring 1 can be expressed as:

Among them, R _O is the radius of the raceway of the outer ring 1.

In this way, compared with the relative sliding linear velocity of the contact point of the conductive unit 51 in contact with the inner ring in the patent literature of the background technology, the relative sliding linear velocity of the contact point of the conductive unit 51 and the inner ring 2 of the present application is reduced by half, Therefore, the problem of failure of the conductive unit 51 due to the high relative speed between the conductive unit 51 and the outer ring 1 and the inner ring 2 of the bearing is reduced.

A bearing according to a second embodiment of the present application will be described below with reference to the accompanying drawings.

(Bearing according to the second embodiment of the present application)

The structure of the bearing according to the second embodiment of the present application is basically the same as that of the bearing according to the first embodiment of the present application, and the differences between the two are mainly described below.

In this embodiment, as shown in FIG. 2 , the conductive component 5 is fixed to the side beam 41 of the cage 4 . The conductive assembly 5 includes a plurality of conductive units 51 and a conductive ring 52 . A plurality of conductive units 51 are electrically connected through the conductive ring 52, and a part of the conductive units 51 in the plurality of conductive units 51 is in contact with the outer ring rib 11, and another part of the conductive units 51 in the plurality of conductive units 51 is in contact with the inner ring retainer. The sides 21 are in contact, thereby achieving substantially the same effect as that of the first embodiment.

Further, as shown in FIG. 2 , the conductive unit 51 of the plurality of conductive units 51 that is in contact with the outer ring 1 includes a conductive base 511 and a first elastic conductive portion 512 , and the conductive base 511 is fixed to the bridge of the cage 4 41 , the first elastic conductive part 512 is installed on the conductive base 511 and contacts the outer ring rib 11 . Among the multiple conductive units 51, the part of the conductive unit 51 that is in contact with the inner ring 2 includes a conductive base 511 and a second elastic conductive part 513. The conductive base 511 is fixed to the bridge 41 of the cage 4, and the second elastic conductive part 513 is installed It is on the conductive base 511 and is in contact with the rib 21 of the inner ring. In addition, the conductive unit 51 of the plurality of conductive units 51 that is in contact with the outer ring 1 and the conductive unit 51 of the plurality of conductive units 51 that is in contact with the inner ring 2 are arranged at intervals in the circumferential direction C, which can Alternate arrangement as shown in FIG. 2 is adopted, and alternative arrangement may also be adopted in other manners.

The present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications to the above-mentioned embodiments of the present application under the teaching of the present application without departing from the scope of the present application. In addition, the following description is also given.

i. It is described in the above embodiments that the conductive assembly 5 includes a plurality of conductive units 51 and a conductive ring 52 , but the present application is not limited thereto. The conductive component 5 may include only one conductive unit 51 and does not necessarily include the conductive ring 52 , and the conductive unit 51 is always in contact with the outer ring 1 and the inner ring 2 , so that the same effect can also be achieved.

Further, in the bearing of the present application, the cage 4 can also be made of conductive metal material. In this case, even if the conductive assembly 5 includes a plurality of conductive units 51 , the conductive ring 52 does not need to be provided, and the plurality of conductive units 51 can be electrically connected through the cage 4 .

ii. By adopting the bearing with the above-mentioned structure, when the bearing is applied in an environment where current exists, the current flows from the inner ring 2 of the bearing to the outer ring 1 of the bearing through the conductive component 5 without passing through the roller 3, thus avoiding the generation of the raceway Galvanic corrosion.

Further, since the conductive unit 51 is fixed to the bridge 41 of the cage 4 in the bearing of the present application, the relative linear velocity of the contact point between the conductive unit 51 and the outer ring 1 and inner ring 2 of the bearing can be relatively small, which is beneficial to The stability of the contact between the conductive unit 51 and the outer ring 1 and the inner ring 2 of the bearing is ensured, thereby improving the electrical conductivity.

Further, the conductive unit 51 of the present application is fixed on the cage 4 and is in elastic contact with the outer ring 1 and the inner ring 2, which is beneficial to prevent the radial movement of the cage 4 and reduce the inner ring 2 and outer ring of the cage 4 and the bearing. Possible contact and friction between rings 1.

iii. It can be understood that the technical solution of the present application is not limited to be applied to ball bearings, but can also be applied to other types of bearings.

Claims

A bearing comprising an outer ring (1), an inner ring (2), a roller (3), a cage (4) and a conductive component (5),

The conductive component (5) is fixed on the cage (4), and the conductive component (5) is in contact with both the outer ring (1) and the inner ring (2), so that the outer ring (1) ) and the inner ring (2) are electrically connected via the conductive component (5).
The bearing according to claim 1, characterized in that, the conductive component (5) comprises at least one conductive unit (51), the conductive unit (51) is connected with the inner ring (2) and the outer ring ( 1) All contact.
The bearing according to claim 2, characterized in that the conductive unit (51) comprises a conductive base (511), a first elastic conductive part (512) and a second elastic conductive part (513), the conductive base ( 511) is fixed on the cage (4), the first elastic conductive part (512) is installed on the conductive base (511) and is in contact with the outer ring (1), and the second elastic conductive part ( 513) installed on the conductive base (511) and in contact with the inner ring (2).
The bearing according to claim 1, characterized in that, the conductive assembly (5) includes a plurality of conductive units (51) and a conductive ring (52), and the plurality of conductive units (51) pass through the conductive ring ( 52) Electrical conduction, at least a part of the conductive units (51) in the plurality of conductive units (51) are in contact with the outer ring (1), at least a part of the conductive units in the plurality of conductive units (51) (51) is in contact with said inner ring (2).
The bearing according to claim 4, characterized in that,

The conductive unit (51) in contact with the outer ring (1) among the plurality of conductive units (51) includes a conductive base (511) and a first elastic conductive part (512), and the conductive base (511) is fixed In the cage (4), the first elastic conductive part (512) is installed on the conductive base (511) and is in contact with the outer ring (1),

The conductive unit (51) in contact with the inner ring (2) among the plurality of conductive units (51) includes a conductive base (511) and a second elastic conductive part (513), and the conductive base (511) is fixed In the cage (4), the second elastic conductive part (513) is installed on the conductive base (511) and contacts with the inner ring (2).
The bearing according to claim 3 or 5, characterized in that, both the first elastic conductive part (512) and the second elastic conductive part (513) are conductive bundles comprising a plurality of conductive fibers.
The bearing according to claim 3, 5 or 6, characterized in that, the first elastic conductive part (512) is in contact with the outer ring rib (11) of the outer ring (1), and the second elastic The conductive part (513) is in contact with the inner ring rib (21) of the inner ring (2).
The bearing according to claim 3, 5, 6 or 7, characterized in that, the conductive base (511) is roughly C-shaped, and has a hook structure formed by bending free ends towards each other, so as to realize the holding with the Fixing of the rack.
The bearing according to claim 3, 5, 6 or 7, characterized in that, the conductive base (511) comprises a first part (5111), a second part (5112) and a third part (5113) fixed to each other, The second part (5112) and the third part (5113) respectively extend from both ends of the first part (5111) toward one side in the axial direction, and the second part (5112) and the third part (5113) The free ends of both are bent toward each other to form a hook-like structure.
The bearing according to any one of claims 1 to 9, characterized in that, the cage (4) comprises side beams (41) and a plurality of lintels (42), through which the side beams (41) and The plurality of lintels (42) form pockets (4h1) and grooves (4h2), the pockets (4h1) are used to hold the rollers (3), and the grooves (4h2) are opposite to the The side beam (41) and the cross beam (42) are recessed towards the radially inner side, and the conductive unit (51) is clamped to the part of the side beam (41) forming the groove (4h2).
The bearing according to claim 10, characterized in that the pockets (4h1) and the grooves (4h2) are alternately arranged in the circumferential direction (C) of the bearing.
The bearing according to claim 10 or 11, characterized in that, the conductive component (5) comprises a plurality of conductive units (51), and the plurality of conductive units (51) are arranged in the circumferential direction (C) of the bearing. evenly distributed.