A brush plate positioning structure and a motor with an automatic centering function for the brush

Abstract

The present invention discloses a brush plate positioning structure with an automatic centering function for the brush, including a motor brush plate and a motor end cover. The brush plate positioning structure is provided with a slot in the motor end cover, and a bearing positioning cage is arranged on the motor brush plate. When the positioning claws on the bearing positioning cage are inserted into the slot, a bearing chamber is jointly formed by the inner end faces of the positioning claws and the convex blocks. Therefore, the motor brush plate also constitutes a part of the bearing chamber. In this way, when centering the brush, the bearing of the motor armature can be relied on for positioning, which can perfectly ensure the accuracy of the center positioning of the brush and the armature. Moreover, with this structure, during the assembly of the motor, the axial positioning of the motor brush plate can be completed by directly pressing the motor armature against the motor end cover. In this way, the motor brush plate does not need to add auxiliary fixing parts to fix the brush plate, which can prevent the motor from malfunctioning due to reasons such as loosening of the auxiliary fixing parts, and can effectively improve the quality of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of brushed motors, and in particular to a positioning structure of a motor brush plate, and a motor using the brush plate positioning structure. Background Art

[0002] A brushed motor is a rotating electrical machine that contains a brush assembly, converting electrical energy into mechanical energy (for electric motors) or mechanical energy into electrical energy (for generators). In a brushed motor, the brushes contact the commutator, which is coaxially fixed to the motor's armature. Therefore, ensuring the concentricity of the brushes, commutator, and armature is crucial during motor assembly. Traditional motors often rely on independent brush plate positioning devices to maintain concentricity with the bearing housing on the motor's end shield. Because these two components are independent and the end shield and stator assembly require a separate assembly process, misalignment is prone to occur during assembly, which can cause abnormal noise during motor operation. Furthermore, existing motors typically secure the brush plate to the motor end shield with auxiliary fixings. This not only increases the number of steps required to secure the brush plate, but also creates the risk of the auxiliary fixings becoming dislodged and drawn into the motor if not securely fastened, potentially causing the motor to seize. Therefore, further improvements to existing brush plate fixing methods are necessary. Summary of the Invention

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the present invention aims to provide a brush plate positioning structure that can realize automatic center positioning of the motor brush plate and the commutator of the armature without the need for fixing by auxiliary fixing parts.

[0004] To achieve the above-mentioned purpose and other related purposes, the technical solution provided by the present invention is: a brush plate positioning structure with the function of automatically aligning the center of the brush, comprising a motor brush plate and a motor end cover, wherein the motor brush plate is provided with a brush, and the inner circumferential surface of the motor end cover is provided with a plurality of spaced protrusions, the end faces of the protrusions are arc-shaped surfaces, and slots are formed between adjacent protrusions; a bearing positioning cage is provided on the motor brush plate, and the bearing positioning cage is provided with a plurality of positioning claws forming the side walls of the bearing positioning cage, the positioning claws correspond to the number and shape of the slots on the motor end cover, the end faces of the positioning claws are arc-shaped surfaces, and the positioning claws are inserted into the slots, the end faces of the protrusions and the positioning claws are located on the same circumferential surface, a bearing chamber is formed between the protrusions and the positioning claws, and the end faces of the protrusions and the positioning claws are bearing support surfaces.

[0005] Preferably, a positioning cage support ring is provided above the bearing positioning cage, and the upper end of the positioning claw is connected to the positioning cage support ring.

[0006] Preferably, swing limiting feet are provided on the motor brush plate, and swing limiting grooves corresponding to the positions of the swing limiting feet are provided on the inner circumferential surface of the motor end cover.

[0007] Preferably, a brush box is provided on the motor brush plate, the carbon brush is arranged in the brush box, and the carbon brush is concentrically arranged with the bearing positioning cage.

[0008] Preferably, at least one pair of carbon brushes are arranged on the motor brush plate, and each pair of carbon brushes are symmetrically arranged on both sides of the commutator mounting portion.

[0009] Preferably, a brush box support ring is further provided on the motor brush plate, the brush box is arranged on the outer circumferential surface of the brush box support ring, and the bearing positioning cage is arranged on the top of the brush box support ring.

[0010] Preferably, the end faces of the convex blocks and the end faces of the positioning claws are located on the same circumferential surface.

[0011] This patent also discloses a motor adopting the above technical scheme.

[0012] The above technical scheme has the following beneficial effects: The brush plate positioning structure with the function of automatically aligning the center of the carbon brush sets convex blocks in the motor end cover, forms a slot between the convex blocks, and sets a bearing positioning cage on the motor brush plate. When the positioning claws on the side wall of the bearing positioning cage are inserted into the slot, a bearing chamber is jointly formed by the end faces of the positioning claws and the end faces of the convex blocks. Therefore, the motor brush plate also constitutes a part of the bearing chamber. In this way, when assembling the motor, the bearing on the motor armature can be used to accurately position the center of the carbon brush, which can perfectly ensure the accuracy of the center positioning of the carbon brush and the armature; moreover, when using this structure for motor assembly, the axial positioning of the motor brush plate can be completed by directly pressing the bearing end face of the motor armature against the motor end cover. In this way, the motor brush plate does not need to add auxiliary fixing parts for fixation, which can prevent the motor from malfunctioning due to loosening of the auxiliary fixing parts and can effectively improve the quality of the motor. Description of the Drawings

[0013] Figure 1 It is the front view of the motor end cover of the embodiment of the present invention.

[0014] Figure 2 It is the back view of the motor end cover of the embodiment of the present invention.

[0015] Figure 3 It is the front view of the motor brush plate of the embodiment of the present invention.

[0016] Figure 4 It is the back view of the motor brush plate of the embodiment of the present invention.

[0017] Figure 5 It is the overall structure schematic diagram of the embodiment of the present invention.

[0018] Figure 6 is Figure 5 the A-A view of

[0019] Figure 7 is Figure 6 the B-B view of

[0020] Element label description: 1. Motor end cover; 11. Bump; 12. Slot; 13. Swing limit groove; 2. Motor brush plate; 21. Bearing positioning cage; 22. Positioning claw; 23. Positioning cage support ring; 24. Swing limit foot; 25. Brush box; 26. Brush box support ring; 3. Bearing chamber; 4. Roller bearing. Detailed implementation mode

[0021] The following specific embodiments illustrate the implementation mode of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0022] Please refer to Figures 1 to 7 . It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationship, without substantial change of the technical content, should also be regarded as the scope for the implementation of the present invention.

[0023] As Figures 1 to 7 shown, this patent discloses a brush plate positioning structure with an automatic brush center alignment function, which mainly includes a motor brush plate and a motor end cover. A brush box is provided on the motor brush plate, and a brush is provided in the brush box. At least one pair of brushes is provided on the motor brush plate, and each pair of brushes is symmetrically arranged at an interval of 180°.

[0024] As Figure 2 , 3 shown, several spaced bumps 11 are provided on the inner peripheral surface of the motor end cover 1. The end surface of the bump 11 is an arc surface, and a slot 12 is formed between adjacent bumps 11. Again, as Figure 4 , 5As shown, a cylindrical brush box support ring 26 is provided on the motor brush plate 2. The brush box support ring 26 is used to support and connect the brush box 25. The brush box 25 is arranged on both sides of the outer peripheral surface of the brush box support ring 26 and is symmetrically distributed at 180°. The number of electric brushes can be set according to the actual situation.

[0025] A bearing positioning cage 21 is provided at the top of the brush box support ring 26. The bearing positioning cage 21 is a circular structure. Several positioning claws 22 are provided on the bearing positioning cage 21. The positioning claws 22 are spaced apart to form the side wall of the bearing positioning cage 21. The number and shape of the positioning claws 22 correspond to those of the slots 11 on the motor end cover. The inner end surface of the positioning claw 22 is an arc surface, and the positioning claw 22 can be correspondingly inserted into the slot 12 of the motor end cover 1.

[0026] As Figure 5 , 6 , as shown in Figure 7, when the positioning claw 22 is inserted into the slot 12, the inner end surfaces of the convex block 11 and the positioning claw 22 enclose a bearing chamber 3. During motor assembly, the bearing chamber 3 is used to place the ball bearing 4 of the armature. The inner end surfaces of the convex block 11 and the positioning claw 22 should be located on the same circumferential surface. The inner wall of the bearing chamber 3 is composed of the inner end surfaces of the convex block 11 and the positioning claw 22 being spaced apart. In this way, the motor brush plate 2 and the motor end cover 1 respectively form a part of the bearing chamber 3 (as shown in Figure 7 ), so that the center of the electric brush can be accurately positioned by the ball bearing on the motor armature during motor assembly.

[0027] [[ID=1—5]]As a preferred embodiment, a positioning cage support ring 23 can be provided above the bearing positioning cage 21. The upper end of the positioning claw 22 on the bearing positioning cage 21 is connected to the positioning cage support ring 23, and the lower end of the positioning claw 22 is connected to the brush box support ring 26. This can make the motor brush plate 2 more firm. The brush box support ring 26 and the positioning cage support ring 23 should be concentrically arranged.

[0028] Swing limit feet 24 are provided on the brush box 25 of the motor brush plate 2. The swing limit feet 24 are arranged on both sides of the brush box support ring 26 and are connected to it. Correspondingly, swing limit grooves 13 corresponding to the positions of the swing limit feet 24 are provided on the inner peripheral surface of the motor end cover 1. In this way, when the two are assembled, the swing limit feet 24 can be directly snapped into the swing limit grooves 13.

[0029] The brush plate positioning structure with the function of automatically aligning the brush center is provided with bumps in the motor end cover, and slots are formed between the bumps. A bearing positioning cage is arranged on the motor brush plate. When the positioning claws on the side wall of the bearing positioning cage are inserted into the slots, a bearing chamber is jointly surrounded by the end faces of the positioning claws and the end faces of the bumps. Therefore, the motor brush plate also forms a part of the bearing chamber. In this way, during motor assembly, the bearings on the motor armature can be used for accurate positioning of the brush center, which can perfectly ensure the accuracy of the brush and armature center positioning. Moreover, when using this structure for motor assembly, the axial positioning of the motor brush plate can be completed by directly pressing the bearing end face on the motor armature against the motor end cover. In this way, the motor brush plate does not need to add auxiliary fixing parts to fix the brush plate, which can prevent the motor from malfunctioning due to loosening of the auxiliary fixing parts and effectively improve the quality of the motor. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0030] This patent also discloses a motor adopting the above technical solution. As long as the brush positioning structure adopting the above technical solution is used in the motor, it is within the protection scope of this patent.

[0031] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A brush plate positioning structure with an automatic centering function for electric brushes, comprising a motor brush plate and a motor end cover, wherein a carbon brush is provided on the motor brush plate, and it is characterized in that: On the inner circumferential surface of the motor end cover, several convex blocks are provided at intervals. The end face of the convex block is an arc surface, and a slot is formed between adjacent convex blocks. On the motor brush plate, a bearing positioning cage is provided. On the bearing positioning cage, several positioning claws forming the side wall of the bearing positioning cage are provided. The positioning claws correspond to the number and shape of the slots on the motor end cover. The end face of the positioning claw is an arc surface. The positioning claw is inserted into the slot. A bearing chamber is formed between the convex block and the positioning claw. The end face of the convex block and the end face of the positioning claw are bearing axial support surfaces. The motor brush plate forms a part of the bearing chamber.

2. The brush plate positioning structure with the function of automatically aligning the center of the carbon brush according to claim 1, characterized in that: Above the bearing positioning cage, a positioning cage support ring is provided. The upper end of the positioning claw is connected to the positioning cage support ring.

3. The brush plate positioning structure with the function of automatically aligning the center of the carbon brush according to claim 1, characterized in that: On the motor brush plate, swing limit feet are provided. On the inner circumferential surface of the motor end cover, swing limit grooves corresponding to the positions of the swing limit feet are provided.

4. The brush plate positioning structure with the function of automatically aligning the center of the carbon brush according to claim 1, characterized in that: On the motor brush plate, a brush box is provided. The carbon brush is arranged in the brush box. The carbon brush is concentrically arranged with the bearing positioning cage.

5. The brush plate positioning structure with the function of automatically aligning the center of the carbon brush according to claim 1, characterized in that: At least one pair of carbon brushes is arranged on the motor brush plate. Each pair of carbon brushes is symmetrically arranged on both sides of the commutator mounting part.

6. The brush plate positioning structure with the function of automatically aligning the center of the carbon brush according to claim 1, characterized in that: On the motor brush plate, a brush box support ring is further provided. The brush box is arranged on the outer circumferential surface of the brush box support ring. The bearing positioning cage is arranged on the top of the brush box support ring.

7. The brush plate positioning structure with the function of automatically aligning the center of the carbon brush according to claim 1, characterized in that: The end face of the convex block and the end face of the positioning claw are located on the same circumferential surface.

8. A motor, characterized in that: It includes the brush plate positioning structure with the function of automatically aligning the center of the carbon brush according to any one of claims 1 to 7.

Images