CN219247590U - Shaft conductive structure for motor and conductive bearing thereof - Google Patents

Abstract

The utility model relates to a shaft conductive structure for a motor and a conductive bearing thereof. The conductive bearing comprises a bearing inner ring, a bearing outer ring, a shell and a roller structure, and further comprises a grounding ring, wherein the grounding ring comprises a sleeve, carbon brushes and an elastic piece, the sleeve is fixed relative to the bearing outer ring, a plurality of assembly holes are formed in the circumferential direction of the sleeve, the carbon brushes are matched with the assembly holes in a shape, and the elastic piece extrudes the carbon brushes along the radial direction or the axial direction of the conductive bearing so that the heads of the carbon brushes are propped against the bearing inner ring. The shaft conductive structure for the motor and the conductive bearing thereof provided by the utility model have the advantages of compact overall structure and good conductive performance.

Description

Shaft conductive structure for motor and conductive bearing thereof

Technical Field

The utility model relates to the technical field of bearings, in particular to a shaft conductive structure for a motor and a conductive bearing thereof.

Background

Bearings are an important component in contemporary mechanical devices. Its main function is to support the mechanical rotator, reduce the friction coefficient in the course of its movement and ensure its rotation accuracy. The bearing mainly has the functions of bearing load, torque and transmitting rotating speed, and part of using mechanisms requires the bearing to have a conductive function, for example, the bearing of the automobile steering gear requires the bearing to have a good conductive function, so that the horn can be controlled through the steering wheel.

At present, the conductive bearing is mainly used for conducting current on a shaft (particularly a rotor shaft of a motor) supported by the conductive bearing to a motor shell, and when the conductive bearing with a conventional structure is used, the conductive performance is poor, so that the current is intermittent, and the equipment cannot work normally.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides a conductive bearing which has compact overall structure and good conductive performance.

The utility model provides a conductive bearing for a motor, which comprises a bearing inner ring, a bearing outer ring and a roller structure, wherein the bearing outer ring is sleeved on the bearing inner ring, the roller structure is arranged between the bearing inner ring and the bearing outer ring and is used for ensuring relative rotation of the bearing inner ring and the bearing outer ring, the conductive bearing also comprises a grounding ring, the grounding ring comprises a sleeve, a carbon brush and an elastic piece, the sleeve is fixed relative to the bearing outer ring, a plurality of assembly holes are formed in the circumferential direction of the sleeve, the carbon brushes are matched with the assembly holes in a shape, and the elastic piece presses the carbon brush along the radial direction or the axial direction of the conductive bearing so that the head of the carbon brush abuts against the bearing inner ring.

According to one embodiment of the utility model, the sleeve is secured to the bearing outer race or housing by a press fit.

According to one embodiment of the utility model, the sleeve comprises an annular connecting piece and a mounting ring connected with the annular connecting piece, the sleeve is fixed on the bearing outer ring through the annular connecting piece, a plurality of assembly holes are formed in the mounting ring, and the carbon brushes are matched with the assembly holes in a shape.

According to one embodiment of the utility model, a pressing groove is formed in the tail portion of the carbon brush, the elastic piece is a spring ring, and the spring ring is clamped into the pressing groove so that the head portion of the carbon brush radially abuts against the outer side of the bearing inner ring.

According to one embodiment of the utility model, the head of the carbon brush is conical, and the top end of the conical structure of the carbon brush is abutted against the outer side of the bearing inner ring.

According to one embodiment of the utility model, a step is formed on the carbon brush, the radius of the tail of the carbon brush is smaller than that of the head, the elastic piece is a spring, the spring is sleeved on the tail of the carbon brush, one end of the spring is fixed on the annular connecting piece, the other end of the spring abuts against the step of the carbon brush, and the spring presses the carbon brush to enable the head of the carbon brush to abut against the end face of the bearing inner ring along the axial direction.

According to one embodiment of the utility model, the head of the carbon brush is conical, and the top end of the conical structure abuts against the end face of the bearing inner ring.

According to one embodiment of the utility model, the sleeve is configured to be fixed on an end face of the bearing outer race.

The utility model also relates to a shaft conductive structure for the motor, which comprises a rotor shaft, a shell and the conductive bearing, wherein the outer ring of the bearing is fixed with the shell in an interference fit manner, and the inner ring of the bearing is fixed with the rotor shaft in an interference fit manner.

According to one embodiment of the utility model, the sleeve is fixed to the housing and abuts the bearing outer race.

According to the shaft conductive structure for the motor and the conductive bearing thereof, the grounding ring is arranged in the conductive bearing, so that the whole structure is compact, and the conductive performance is good.

It is to be understood that both the foregoing general description and the following detailed description of the present utility model are exemplary and explanatory and are intended to provide further explanation of the utility model as claimed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the accompanying drawings:

fig. 1 shows a schematic structural view of a conductive bearing according to an embodiment of the present utility model.

Fig. 2 is a schematic structural view of the ground ring of fig. 1.

Fig. 3 is a schematic view of the assembly of the roller structure and the ground ring on the bearing inner race of fig. 1.

Fig. 4 is a perspective view of fig. 1.

Fig. 5 is a schematic structural view of the sleeve of fig. 2.

Fig. 6A is an enlarged schematic view of the carbon brush of fig. 2.

Fig. 6B is an enlarged schematic view of the carbon brush of fig. 2.

Fig. 7 shows a schematic structural view of a conductive bearing according to another embodiment of the present utility model.

Fig. 8 is a schematic structural view of the sleeve of the ground ring of fig. 7.

Fig. 9 is an enlarged schematic view of the carbon brush in fig. 8.

Fig. 10 is a schematic structural view of the carbon brush and the elastic member in fig. 8.

Wherein the above figures include the following reference numerals:

conductive bearing 100, 700

Bearing inner race 101, 701

Bearing outer race 102, 702

Roller structure 103, 703

Ground ring 104, 704

Sleeve 105, 705

Carbon brush 106, 706

Elastic member 107, 707

Mounting holes 108, 708

Annular connectors 109, 709

Mounting ring 110, 710

Spring ring 111

Pressure tank 112

Head 113

Tail 114

Rotor shaft 711

Housing 712

Spring 713

Step 714

Tail 715

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application be understood, not simply by the actual terms used but by the meaning of each term lying within.

Fig. 1 shows a schematic structural view of a conductive bearing according to an embodiment of the present utility model. Fig. 2 is a schematic structural view of the ground ring of fig. 1. Fig. 3 is a schematic view of the assembly of the roller structure and the ground ring on the bearing inner race of fig. 1. Fig. 4 is a perspective view of fig. 1. Fig. 5 is a schematic structural view of the sleeve of fig. 2. As shown, the present utility model provides a conductive bearing 100. The conductive bearing 100 includes a bearing inner race 101, a bearing outer race 102, a roller structure 103, and a housing (not shown). Wherein a roller structure 103 is arranged between the bearing inner ring 101 and the bearing outer ring 102, the roller structure 103 being used for ensuring that a relative rotation is maintained between the bearing inner ring 101 and the bearing outer ring 102. The conductive bearing 100 further comprises a ground ring 104, in this embodiment the ground ring 104 is arranged between the bearing outer ring 102 and the bearing inner ring 101. One of the main functions of the conductive bearing 100 is to conduct the current on the rotor shaft of the motor it supports to the motor housing. Further, referring to fig. 2 and 5, the ground ring 104 includes a sleeve 105, a carbon brush 106, and an elastic member 107. Sleeve 105 is coaxial with bearing inner race 101 and bearing outer race 102. Sleeve 105 is fixed based on bearing outer race 102. A plurality of fitting holes 108 are formed in the circumferential direction of the sleeve 105. The carbon brushes 106 are in one-to-one correspondence and form fit with the assembly holes 108, and the carbon brushes 106 are installed in the assembly holes 108. The elastic member 107 presses the carbon brush 106 in the radial direction of the conductive bearing 100. The elastic member 107 maintains its deformation elastic force so that the head 113 of the carbon brush 106 is abutted against the outer wall of the bearing inner ring 101 in the radial direction of the conductive bearing 100.

The conductive bearing 100 provided by the utility model is characterized in that the grounding ring 104 is arranged in the conductive bearing, so that the whole structure is compact, the elastic piece 107 can provide a pressing force for a long time, the carbon brush 106 and the bearing inner ring 101 are always kept in contact, and the conductive performance is improved.

Preferably, sleeve 105 is secured to the inside of bearing outer race 102 by a press fit such that compression occurs between sleeve 105 and bearing outer race 102, firmly bonding the two together. The conductive bearing 100 can also bear uniform or nonuniform load on the whole through a press fit mode, and the structure is simple and the manufacturing is convenient.

Referring to fig. 5, the sleeve 105 preferably includes an annular connector 109 and a mounting ring 110 connected to the annular connector 109. The sleeve 105 is fixed to the inner side of the bearing outer race 102 by an annular coupling 109. In the present embodiment, a plurality of radial assembly holes 108 are formed in the mounting ring 110, and the carbon brushes 106 are matched with the radius of the assembly holes 108, so that the carbon brushes 106 can be conveniently mounted in the assembly holes 108.

Turning to fig. 2, the ground ring 104 includes a sleeve 105, carbon brushes 106, and an elastic member 107. Wherein the elastic member 107 is a spring coil 111. Fig. 6A is an enlarged schematic view of the carbon brush of fig. 2. Fig. 6B is an enlarged schematic view of the carbon brush of fig. 2. Referring to fig. 6A and 6B, a pressing groove 112 is formed in the tail portion 114 of the carbon brush 106, and as shown in fig. 2 and 3, the spring ring 111 is snapped into the pressing groove 112 of the carbon brush 106 to make the head portion 113 of the carbon brush 106 abut against the outer wall of the bearing inner ring 101 radially inward. The spring ring 111 forms radial clamping force, so that the carbon brush 106 and the bearing inner ring 101 are always kept in contact, and the conductivity is improved.

Preferably, referring to fig. 6A and 6B, the head 113 of the carbon brush 106 is tapered, and the tip of the tapered structure abuts against the outer side of the bearing inner ring 101. Since the top end of the tapered structure is a tip, referring to fig. 1, the carbon brush 106 and the bearing inner ring 101 form point contact, and energy loss can be reduced during the operation of the conductive bearing 100.

Fig. 7 shows a schematic structural view of a conductive bearing according to another embodiment of the present utility model. Fig. 8 is a schematic structural view of the sleeve of the ground ring of fig. 7. As shown, the conductive bearing 700 includes a bearing inner race 701, a bearing outer race 702, and a roller structure 703. Wherein a roller structure 703 is disposed between the bearing inner race 701 and the bearing outer race 702.

Further, the conductive bearing 700 further includes a ground ring 704 disposed within the conductive bearing 700. The ground ring 704 includes a sleeve 705, carbon brushes 706, and an elastic member 707. Sleeve 705 is coaxial with bearing inner ring 701 and bearing outer ring 702. Sleeve 705 is fixed relative to bearing outer ring 702. In the present embodiment, a sleeve 705 is fixed to an end face of a bearing outer ring 702. Referring to fig. 8, the sleeve 705 includes an annular connection 709 and a mounting ring 710 coupled to the annular connection 709. The sleeve 705 is secured to the inner wall of the housing 712 by an annular connector 709. A plurality of fitting holes 708 are formed in the circumferential direction of the mounting ring 710 of the sleeve 705. In this embodiment, the mounting holes 708 are oriented in the axial direction of the conductive bearing 700. The carbon brushes 706 are in one-to-one correspondence with and form fit with the mounting holes 708, and the carbon brushes 706 are mounted in the mounting holes 708. As shown in fig. 7, the elastic member 707 presses the carbon brush 706 in the axial direction of the conductive bearing 700. The elastic member 707 maintains its deformation elastic force so that the head 716 of the carbon brush 706 axially abuts against the end face of the bearing inner ring 701 along the conductive bearing 700.

Fig. 9 is an enlarged schematic view of the carbon brush 706 in fig. 8. Fig. 10 is a schematic structural view of the carbon brush 706 and the elastic member 707 in fig. 8. Preferably, the elastic member 707 is a spring 713. A step 714 is formed on the carbon brush 706, and the radius of the tail 715 of the carbon brush 706 is smaller than that of the head 716. The springs 713 are in one-to-one correspondence with the carbon brushes 706, and the springs 713 are sleeved on the tail 715 of the carbon brush 706. Specifically, as shown in fig. 7, one end of the spring 713 is fixed to the annular connecting member 709 of the sleeve 705, and the other end abuts against the step 714 of the carbon brush 706, which corresponds to abutting against the head 716 of the carbon brush 706. The spring 713 presses the carbon brush 706 so that the head 716 of the carbon brush 706 axially abuts against the end face of the housing 712. Similar to the spring ring 111, the elastic deformation force is formed into an axial clamping force, so that the carbon brush 706 is always in contact with the end surface of the bearing inner ring 701, and the conductivity is improved.

Preferably, referring to fig. 9, the head 716 of the carbon brush 706 is tapered, and the top end of the tapered structure abuts against the end face of the bearing inner ring 701. Because the top end of the conical structure is a tip, the carbon brush 706 and the end surface of the bearing inner ring 701 form point contact, and energy loss can be reduced in the working process of the conductive bearing 700.

Preferably, the present utility model also provides a shaft conductive structure for an electric machine, referring to fig. 7, the shaft conductive structure includes a conductive bearing 700, a rotor shaft 711 and a housing 712. The housing 712 herein refers to a motor housing, or a bearing housing that is integral with or fixedly connected to the motor housing. Further, the bearing outer ring 702 is fixed by interference fit with the housing 712, and the bearing inner ring 701 is fixed by interference fit with the rotor shaft 711. The rotation of the rotor shaft 711 drives the bearing inner ring 701 to rotate, and the bearing inner ring 701 can maintain relative rotation with the bearing outer ring 702 based on the roller structure 703.

Optionally, a sleeve 705 is fixed to the inner wall of the housing 712 and abuts the end face of the bearing outer race 702, the sleeve 705 being in clearance fit with the rotor shaft 712.

The shaft conductive structure and the conductive bearing thereof provided by the utility model have the advantages that:

1. the grounding ring is arranged between the bearing outer ring and the bearing inner ring, so that the carbon brush is contacted with the bearing inner ring along the radial direction, and the structure can reduce the axial occupied space of the conductive bearing;

2. the elastic piece can provide long-term retention force, so that the carbon brush is always in contact with the inner wall or the end face of the bearing inner ring, and the conductivity is improved;

3. the carbon brush head and the inner wall or the end surface of the bearing inner ring form point contact, so that energy loss can be reduced in the working process of the conductive bearing;

4. the whole structure is compact, and the manufacturing cost is low.

It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present utility model without departing from the spirit and scope of the utility model. Therefore, it is intended that the present utility model cover the modifications and variations of this utility model provided they come within the scope of the appended claims and their equivalents.

Claims (10)

1. The utility model provides a conductive bearing for motor, includes bearing inner race, bearing outer lane and roller structure, the bearing outer lane is established on the bearing inner race, roller structure sets up be used for guaranteeing between bearing inner race and the bearing outer lane that both rotate relatively, its characterized in that, conductive bearing still includes the ground ring, the ground ring includes sleeve, carbon brush and elastic component, the sleeve is constructed for the bearing outer lane is fixed a plurality of pilot holes have been seted up in telescopic circumference, a plurality of the carbon brush with pilot hole form fit, the elastic component is followed conductive bearing's radial or axial extrusion carbon brush, so that the head of carbon brush supports and lean on the bearing inner race.

2. The electrically conductive bearing of claim 1, wherein the sleeve is secured to the inner side of the bearing outer race by a press fit.

3. The conductive bearing as claimed in claim 1, wherein the sleeve includes an annular connecting member and a mounting ring connected to the annular connecting member, the sleeve is fixed to the bearing outer ring through the annular connecting member, a plurality of the fitting holes are formed in the mounting ring, and the carbon brushes are in shape fit with the fitting holes.

4. The conductive bearing as claimed in claim 3, wherein a pressing groove is formed at the tail of the carbon brush, the elastic member is a spring ring, and the spring ring is clamped into the pressing groove to enable the head of the carbon brush to radially lean against the outer side of the bearing inner ring.

5. The conductive bearing according to claim 4, wherein the head portion of the carbon brush is tapered, and a tip of the tapered structure abuts against an outer side of the bearing inner ring.

6. The conductive bearing as claimed in claim 3, wherein a step is formed on the carbon brush, a radius of a tail portion of the carbon brush is smaller than a radius of a head portion of the carbon brush, the elastic member is a spring, the spring is sleeved on the tail portion of the carbon brush, one end of the spring is fixed on the annular connecting member, the other end of the spring abuts against the step of the carbon brush, and the spring presses the carbon brush to enable the head portion of the carbon brush to abut against an end face of the bearing inner ring in the axial direction.

7. The conductive bearing according to claim 6, wherein the head portion of the carbon brush is tapered, and a tip end of the tapered structure abuts against an end face of the bearing inner ring.

8. The electrically conductive bearing of claim 1, wherein the sleeve is configured to be secured to an end face of the bearing outer race.

9. A shaft conductive structure for an electric machine, the shaft conductive structure comprising a rotor shaft, a housing, and the conductive bearing of claim 1, wherein the bearing outer race is secured to the housing in an interference fit, and the bearing inner race is secured to the rotor shaft in an interference fit.

10. The shaft conductive structure of claim 9 wherein the sleeve is secured to the housing and abuts the bearing outer race.

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