Brush motor

Abstract

The utility model relates to a brush motor. The brush motor comprises a housing, a commutator, a brush sheet assembly and an elastic member. The commutator is rotatably arranged in the shell. Each brush piece assembly comprises a brush piece body and an electric brush which are arranged in the shell, the brush piece body comprises a first part and a second part which are connected in a bent mode, the first part is connected with the shell, the second part is connected with the electric brush, and the electric brush makes sliding contact with the peripheral wall of the commutator. And the electric brushes of the two groups of brush sheet assemblies are respectively positioned on two opposite sides of the commutator. The elastic piece is connected with the first part and the second part and used for providing elastic force to act on the second part and enabling the electric brush to elastically abut against the peripheral wall of the commutator.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, specifically, relate to a brush motor. BACKGROUND

[0002] Brush motor is the rotating electrical machine that contains brush device. Brush motor is the basis of all electrical machines, it has the characteristics such as quick start, braking in time, smooth speed regulation in a wide range and relatively simple control circuit. Brush motor usually includes commutator and two electric brushes connected to the positive and negative poles of power supply respectively, the commutator rotates with the rotor of the motor, and the electric brush slides on the outer wall of the commutator, thereby realizing the conduction and commutation of electric current.

[0003] However, the vibration generated in the working process of the motor and the rotation of the commutator will drive the electric brush to jump in the direction perpendicular to the surface of the commutator. When the electric brush jumps too much, it cannot stably apply pressure to the commutator, which may cause poor contact between the electric brush and the commutator. This poor contact will affect the stability of current transmission and interfere with the normal operation of the motor. SUMMARY

[0004] The utility model discloses a brush motor, which solves the technical problem of how to limit the jumping of the electric brush relative to the commutator.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme.

[0006] The utility model provides a brush motor, it includes: casing, commutator, brush piece subassembly, brush piece body and electric brush that are arranged in the casing, the brush piece body includes the first part and the second part that are connected in the form of bending, the first part is connected with the casing, the second part is connected with the electric brush, and the electric brush is in sliding contact with the outer wall of the commutator, the brush piece subassembly is equipped with two groups, and the electric brush of two groups of brush piece subassembly is located at the opposite sides of the commutator respectively, elastic part is connected with the first part and the second part respectively, and is used to provide the elastic force acting on the second part, and the electric brush is in elastic abutment with the outer wall of the commutator.

[0007] In some embodiments of the present application, the two groups of brush piece assemblies are symmetrically distributed with the rotation center of the commutator as the axis; the first part extends in a first direction, the first parts of the two groups of brush piece assemblies are distributed side by side in a direction perpendicular to the first direction; the second part extends in a second direction, the first direction and the second direction form an acute angle, the second parts of the two groups of brush piece assemblies are located between the first parts of the two groups of brush piece assemblies and are distributed side by side in a direction perpendicular to the second direction, the brushes of the two groups of brush piece assemblies are oppositely arranged; the commutator is arranged between the second parts of the two groups of brush piece assemblies; the elastic member is arranged at the bending connection between the first part and the second part and is located in the acute angle.

[0008] In some embodiments of the present application, the brushes are located on the side of the second part facing the first part, wherein the second part of one group of brush piece bodies is located between the first part and the second part of the other group of brush piece bodies.

[0009] In some embodiments of the present application, a fixing seat is arranged in the shell, the fixing seat is provided with a fixing groove, a guide groove is arranged on a groove wall of the fixing groove, the guide groove comprises a first groove section and a second groove section in communication with the fixing groove and the first groove section respectively, and the groove width of the second groove section is smaller than the groove width of the first groove section; the brush piece assembly further comprises a brush piece support and a connecting assembly, the brush piece support is connected with the first part, the connecting assembly comprises an elastic structure and a guide block connected with the elastic structure and the brush piece support respectively, and the size of the guide block is greater than the groove width of the second groove section.

[0010] The first part and the brush piece support are arranged in the fixing groove, the elastic structure and the guide block are arranged in the first groove section, the elastic structure provides an elastic force to press the guide block against the end face of the second groove section, and the first part is pressed against the other groove wall of the fixing groove.

[0011] In some embodiments of the present application, the brush piece support and the first part are connected through a fastener, the fastener comprises a rod part and a cap part, the rod part passes through the first part and the brush piece support in sequence, and the cap part is exposed on the surface of the first part; the other groove wall of the fixing groove is provided with a cap groove matched with the cap part, and when the first part is pressed against the groove wall, the cap part is embedded in the cap groove.

[0012] In some embodiments of the present application, the fixing seat comprises a first fixing plate, a second fixing plate and a third fixing plate which are arranged side by side and spaced apart, and the other end of the first fixing plate and the other end of the second fixing plate form a gap, and the first part is partially exposed outside the fixing groove through the gap and is connected with the first part.

[0013] In some embodiments of the present application, the elastic member is an elastic glue which is arranged between the first part and the second part in a dispensing manner.

[0014] In some embodiments of the present application, the material of the elastic member is silica resin.

[0015] From the above technical solution, the embodiments of the present application have at least the following advantages and positive effects:

[0016] In the brush motor, the brushes of the two groups of brush piece assemblies are located at opposite sides of the commutator and in sliding contact with the outer peripheral wall of the commutator, and are respectively used for transmitting electric currents of different polarities to the commutator. The first part is connected with the shell, which can ensure that the first part is relatively fixed in the shell. The bending structure formed by the first part and the second part enables the second part and the brushes thereon to be elastically displaced relative to the first part when the first part is relatively fixed, thereby reducing wear and damage caused by excessively rigid structure in a vibration scenario. Further, the elastic member is connected with the first part and the second part and is used for providing elastic force acting on the second part. When the second part has a tendency to be elastically displaced, the elastic member can provide elastic force to drive the second part to return to its original position, so as to limit the jumping of the brushes on the second part relative to the commutator, ensure that the brushes can stably apply pressure to the commutator, maintain close contact between the brushes and the commutator, thereby reducing the possibility of poor contact, improving the stability of current transmission, and ensuring the normal operation of the brush motor. BRIEF DESCRIPTION OF DRAWINGS

[0017] The various objects, features and advantages of the present application will become more apparent from the following detailed description of preferred embodiments of the present application, considered in conjunction with the accompanying drawings. The drawings are not necessarily to scale, and the emphasis is generally placed upon illustrating the principles of the present application. In the drawings, like reference numerals refer to like parts throughout the several views. Among other things:

[0018] Figure 1 is a structural schematic view of a brush motor according to an exemplary embodiment.

[0019] Figure 2 is Figure 1 a structural schematic view of another perspective of

[0020] Figure 3 is Figure 2 Structure diagram of the fixed seat in the brush piece assembly.

[0021] Figure 4 is Figure 2 Structure diagram of the fixed seat in the brush piece assembly.

[0022] The reference signs are explained as follows:

[0023] 1, housing; 12, fixed seat; 121, fixed groove; 1211, cap groove; 1212, accommodation opening; 122, guide groove; 1221, first groove section; 1222, second groove section; 123, first fixed plate; 124, second fixed plate; 125, third fixed plate;

[0024] 2, commutator;

[0025] 3, brush piece assembly; 31, brush piece body; 311, first part; 312, second part; 32, electric brush; 33, brush piece support; 34, connecting assembly; 341, elastic structure; 342, guide block; 35, damping strip;

[0026] 4, elastic member;

[0027] 5, fastener; 51, rod part; 52, cap part;

[0028] D1, first direction; D2, second direction. DETAILED DESCRIPTION

[0029] While the present application can be susceptible to embodiment in different forms, only some of the specific embodiments are shown and described in detail in the drawings and the specification herein, it being understood that the specification is to be considered an exemplification of the principles of the application and is not intended to limit the application to that as described herein.

[0030] Thus, one feature that is described in the specification can be used to describe one feature of an embodiment of the application, and not every embodiment of the application necessarily includes that feature. Also, it is noted that the specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations not explicitly described. Thus, unless otherwise noted, the described combinations are not intended to be limiting.

[0031] In the embodiments shown in the drawings, the indications of directions, such as up, down, left, right, front and back, are used to explain the structure and movement of various elements of the present application and are not absolute but relative. These indications are appropriate when the elements are in the positions shown in the drawings. If the positions of the elements change, the indications of directions also change accordingly.

[0032] Referring to Figures 1 to 4 The brush motor provided by the embodiment of the present application mainly comprises a shell 1, a commutator 2, a brush piece assembly 3 and an elastic member 4. The commutator 2 is rotatably arranged in the shell 1. The brush piece assembly 3 comprises a brush piece body 31 and a brush 32 arranged in the shell 1. The brush piece body 31 comprises a first part 311 and a second part 312 which are connected in a bending manner. The first part 311 is connected with the shell 1, and the second part 312 is connected with the brush 32 and makes the brush 32 in sliding contact with the outer peripheral wall of the commutator 2. The brush piece assembly 3 is provided with two groups, and the brushes 32 of the two groups of brush piece assemblies 3 are respectively located on opposite sides of the commutator 2. The elastic member 4 is connected with the first part 311 and the second part 312 respectively, and is used for providing an elastic force acting on the second part 312 and making the brush 32 in elastic abutment with the outer peripheral wall of the commutator 2.

[0033] In the brush motor of the embodiment of the present application, the brushes 32 of the two groups of brush piece assemblies 3 are respectively located on opposite sides of the commutator 2 and in sliding contact with the outer peripheral wall of the commutator 2, and are respectively used for transmitting different polarity currents to the commutator 2. The first part 311 is connected with the shell 1, which can ensure that the first part 311 is relatively fixed in the shell 1. The bending structure formed by the first part 311 and the second part 312 makes the second part 312 and the brush 32 thereon be able to elastically displace relative to the first part 311 in the case that the first part 311 is relatively fixed, which can reduce the abrasion and damage caused by the over-rigid structure in the vibration scene. Further, since the elastic member 4 is connected with the first part 311 and the second part 312 respectively and is used for providing an elastic force acting on the second part 312, the elastic member 4 can provide an elastic force for driving the second part 312 to reset in the case that the second part 312 has a tendency of elastic displacement, so as to limit the jumping of the brush 32 on the second part 312 relative to the commutator 2, ensure that the brush 32 can stably apply pressure to the commutator 2, maintain the close contact between the brush 32 and the commutator 2, thereby reducing the possibility of poor contact, improving the stability of current transmission, and ensuring the normal operation of the brush motor.

[0034] Referring to Figure 1 and Figure 2In the embodiment where the above brush piece assembly 3 is provided with two groups, and the electric brushes 32 of the two groups of brush piece assemblies 3 are located at opposite sides of the commutator 2, the two groups of brush piece assemblies 3 are centrally symmetrically distributed with the rotation center of the commutator 2 as the axis. The first portions 311 extend along the first direction D1, and the first portions 311 of the two groups of brush piece assemblies 3 are distributed side by side and spaced apart in a direction perpendicular to the first direction D1. The second portions 312 extend along the second direction D2, and the first direction D1 and the second direction D2 form an acute angle, the second portions 312 of the two groups of brush piece assemblies 3 are located between the first portions 311 of the two groups of brush piece assemblies 3, and are distributed side by side and spaced apart in a direction perpendicular to the second direction D2, and the electric brushes 32 of the two groups of brush piece assemblies 3 are oppositely arranged. The commutator 2 is arranged between the second portions 312 of the two groups of brush piece assemblies 3. The elastic member 4 is arranged at the bending connection between the first portion 311 and the second portion 312, and is located in the acute angle.

[0035] The layout of the first portions 311 and the second portions 312 of the two groups of brush piece assemblies 3 can effectively utilize the space inside the motor, so that the internal structure of the motor is more compact. The compact structure not only helps to reduce the volume of the motor, but also improves the structural stability of the motor. The elastic member 4 is arranged at the bending connection and located in the acute angle formed by the first direction D1 and the second direction D2. This position makes the direction of the elastic force provided by the elastic member 4 better adapt to the displacement direction of the second portion 312, so that the elastic member 4 can more stably and effectively play its elastic role.

[0036] In further embodiments, the electric brushes 32 are located on the side of the second portion 312 facing the first portion 311, and the second portion 312 of one group of brush piece bodies 31 is located between the first portion 311 and the second portion 312 of the other group of brush piece bodies 31. On the one hand, this helps the electric brushes 32 on the second portion 312 to more evenly and stably contact the commutator 2, and on the other hand, it can further improve the space utilization of the brush motor.

[0037] In other embodiments, the electric brushes 32 are located on the side of the second portion 312 away from the first portion 311, and the second portion 312 of one group of brush piece bodies 31 is located between the first portion 311 of the group of brush piece bodies 31 and the second portion 312 of the other group of brush piece assemblies 3.

[0038] Please refer to Figures 1 to 4In the above-mentioned first part 311 and the shell 1 is connected in one embodiment, the shell 1 is provided with a fixed seat 12, the fixed seat 12 is provided with a fixed groove 121, the groove wall of the fixed groove 121 is provided with a guide groove 122, the guide groove 122 includes a first groove section 1221 and a second groove section 1222 which is communicated with the fixed groove 121 and the first groove section 1221 respectively, and the groove width of the second groove section 1222 is smaller than the groove width of the first groove section 1221. The brush piece assembly 3 further includes a brush piece support 33 and a connecting assembly 34, the brush piece support 33 is connected with the first part 311, the connecting assembly 34 includes an elastic structure 341 and a guide block 342 which is connected with the elastic structure 341 and the brush piece support 33 respectively, and the size of the guide block 342 is greater than the groove width of the second groove section 1222. The first part 311 and the brush piece support 33 are arranged in the fixed groove 121, the elastic structure 341 and the guide block 342 are arranged in the first groove section 1221, the elastic structure 341 provides an elastic force to press the guide block 342 on the end face of the second groove section 1222, and the first part 311 is pressed on the other groove wall of the fixed groove 121, the design of the guide groove 122 and the guide block 342 provides a guide for the assembly of the brush piece assembly 3.

[0039] In the assembly process, the operator can easily put the guide block 342 into the first groove section 1221 according to the structure of the guide groove 122, which reduces the difficulty of disassembly. Through the cooperation of the guide groove 122, the guide block 342 and the elastic structure 341, the first part 311 can be firmly fixed in the fixed groove 121, thereby realizing the connection between the first part 311 and the shell 1, and the elastic force provided by the elastic structure 341 can effectively reduce the phenomenon of loose or offset connection, and has the characteristics of strong connection stability.

[0040] In the present embodiment, the elastic structure 341 is a spring.

[0041] It is conceivable that the shell 1 of the brush motor includes a main body and an end cover, and in the present embodiment, the fixed seat 12 is arranged on the end cover.

[0042] Please refer to Figure 3 and Figure 4 In further implementation, the brush piece support 33 and the first part 311 are connected through a fastener 5, the fastener 5 includes a rod portion 51 and a cap portion 52, the rod portion 51 passes through the first part 311 and the brush piece support 33 in turn, and the cap portion 52 is exposed on the surface of the first part 311. The other groove wall of the fixed groove 121 is provided with a cap groove 1211 which cooperates with the cap portion 52, and when the first part 311 is pressed on the groove wall, the cap portion 52 is embedded in the cap groove 1211. The cooperation of the cap portion 52 and the cap groove 1211 provides more accurate positioning for the assembly of the brush piece assembly 3, and the groove wall of the cap groove 1211 can limit the movement of the cap portion 52, further improving the stability of the connection.

[0043] In a specific embodiment, the fixing base 12 comprises a first fixing plate 123, a second fixing plate 124 and a third fixing plate 125 connected with one end of the first fixing plate 123 and one end of the second fixing plate 124 respectively, and the other end of the first fixing plate 123 and the other end of the second fixing plate 124 form a gap 1212, the first part 311 is partially exposed outside the fixing groove 121 through the gap 1212 and connected with the first part 311. The structure of the fixing base 12 provides stable support for the first part 311, and the existence of the gap 1212 enables the first part 311 to be effectively connected with the second part 312 outside, forming a bending structure.

[0044] In the embodiment, the brush piece support 33 is arranged on the side of the second part 312 away from the first part, the fixing groove 121 is arranged on the second fixing plate 124, and the cap groove 1211 is arranged on the first fixing plate 123.

[0045] In the above embodiments, the second part 312 is further provided with a damping strip 35 for inhibiting vibration of the brush 32.

[0046] In a specific embodiment, the elastic member 4 is an elastic glue, which is arranged between the first part 311 and the second part 312 in a glue dispensing manner. The elastic glue has the performance of elastic deformation and can uniformly disperse pressure, thereby ensuring stable contact between the brush 32 and the commutator 2. The elastic glue is arranged in a glue dispensing manner, can be bonded on the first part 311 and the second part 312 respectively, realizes connection with the two parts, and has the characteristics of quickness and convenience.

[0047] In the embodiment, the material of the elastic member 4 is silica resin, which has the characteristics of strong stability, moderate hardness and good wear resistance, and can stably play its elastic role.

[0048] Although the utility model has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than limiting terms. Since the utility model can be embodied in various forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the above-mentioned details, but should be interpreted broadly in the spirit and scope defined by the appended claims, so that all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A brushed electric motor characterized by, include: case; The commutator is rotatably disposed within the housing; The brush assembly includes a brush body and a brush disposed within the housing. The brush body includes a first part and a second part that are bent and connected. The first part is connected to the housing, and the second part is connected to the brush, and the brush slides in contact with the outer peripheral wall of the commutator. The brush assembly is provided in two sets, and the brushes of the two sets of the brush assembly are respectively located on opposite sides of the commutator. An elastic element, connected to the first part and the second part respectively, is used to provide an elastic force to the second part and to make the brush elastically abut against the outer peripheral wall of the commutator.

2. The brushed electric motor of claim 1, wherein, The two sets of brush assemblies are centrally symmetrical about the rotation center of the commutator. The first portion extends along a first direction, and the first portions of the two sets of brush assemblies are distributed side by side at intervals in a direction perpendicular to the first direction; The second part extends along the second direction, and the first direction and the second direction form an acute angle. The second parts of the two sets of brush assemblies are located between the first parts of the two sets of brush assemblies and are distributed side by side at intervals in a direction perpendicular to the second direction. The brushes of the two sets of brush assemblies are arranged facing each other. The commutator is located between the second portions of the two sets of the brush assemblies; The elastic element is located at the bend connection between the first part and the second part, and is situated within the acute angle.

3. The brushed electric motor of claim 2, wherein, The brush is located on the side of the second portion facing the first portion, wherein the second portion of one set of brush bodies is located between the first and second portions of another set of brush bodies.

4. The brushed electric motor of claim 1, wherein, The housing is provided with a fixing seat, the fixing seat has a fixing groove, and a guide groove is provided on one wall of the fixing groove. The guide groove includes a first groove segment and a second groove segment that communicates with the fixing groove and the first groove segment respectively, and the groove width of the second groove segment is smaller than the groove width of the first groove segment. The brush assembly further includes a brush holder and a connecting assembly. The brush holder is connected to the first part. The connecting assembly includes an elastic structure and a guide block connected to the elastic structure and the brush holder respectively. The size of the guide block is larger than the groove width of the second groove segment. The first part and the brush holder are disposed in the fixed groove, the elastic structure and the guide block are disposed in the first groove segment, the elastic structure provides elastic force to drive the guide block to press against the end face of the second groove segment, and to press the first part against the other groove wall of the fixed groove.

5. The brushed electric motor of claim 4, wherein, The brush holder is connected to the first part by a fastener, the fastener including a rod and a cap, the rod passing through the first part and the brush holder in sequence, and the cap being exposed on the surface of the first part; The other wall of the fixing groove is provided with a cap groove that matches the cap part. When the first part is pressed against the groove wall, the cap part is embedded in the cap groove.

6. The brushed electric motor of claim 4, wherein, The fixing base comprises a first fixing plate, a second fixing plate and a third fixing plate connected with one end of the first fixing plate and one end of the second fixing plate respectively, and the other end of the first fixing plate and the other end of the second fixing plate form a gap, and the first part is partially exposed outside the fixing groove through the gap and connected with the first part.

7. The brushed electric motor of claim 1, wherein, The elastic member is an elastic glue, and the elastic member is arranged between the first part and the second part in a glue dispensing manner.

8. The brushed electric motor of claim 7, wherein, The material of the elastic member is silica resin.

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