Electric brush assembly, conduction device and inner rotor motor

Abstract

The invention relates to an electric brush assembly, a conduction device and an inner rotor motor. The electric brush assembly comprises a supporting body and at least two electric brush pieces arranged at intervals in the axial direction. Each electric brush piece comprises an elastic piece and a carbon brush. Each elastic piece comprises a fixed end fixedly connected with the supporting body and a free end opposite to the fixed end. And each carbon brush is fixed at the free end of the corresponding elastic sheet and is provided with a contact surface which is in sliding contact with a sliding ring. And the contact surface deviates from the outward direction of the carbon brush and is wound on the support body and all the elastic sheets. By pushing the carbon brush at the free end of the elastic piece, the sliding ring can continue to move in the preset installation direction till the sliding ring reaches the preset position relative to the supporting body. Since the brush assembly does not form a closed inner peripheral area, the operation of pushing each elastic sheet to the outer periphery by means of a special tool is avoided, the assembly process of the inner rotor motor is simplified, and the assembly efficiency of the inner rotor motor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a brush assembly, a conduction device and an inner rotor motor. Background Art

[0002] A motor generally includes a stator and a rotor, and the rotor can rotate relative to the stator. Based on the internal and external position relationship between the stator and the rotor, motors can be divided into two categories: inner rotor motors and outer rotor motors. In an inner rotor motor, the stator is surrounded by the rotor. The rotor rotates inside the stator.

[0003] In the process of rotor rotation, brushes are usually required to cooperate with commutators or slip rings to realize the conduction of the rotor. When the slip ring on the rotor needs to contact multiple brushes, in order to ensure the insulation between the multiple brushes, the traditional technology generally allows multiple brushes to be evenly staggered along the outer circumference of the rotor. However, in the assembly process of the motor, after multiple brushes are installed first, each brush moves closer to the central axis under the action of the spring, resulting in the diameter of the inner circumference area enclosed by each brush in its natural form being smaller than the diameter of the slip ring. In the process of motor assembly, the slip ring cannot be directly inserted axially into the inner circumference area defined by the multiple brushes. It is necessary to use a jig to push each brush in the outer circumference direction to expand the diameter of the inner circumference area defined by each brush before the slip ring can be pushed axially into the inner circumference area. Since the motor needs to use special tools to push the brushes during assembly, the assembly steps of the motor are relatively complicated, which is not conducive to improving the assembly efficiency of the motor. Summary of the invention

[0004] Based on this, the present invention provides a brush assembly, a conduction device and an inner rotor motor that can solve or at least alleviate the above technical problems.

[0005] The present invention provides a brush assembly, comprising:

[0006] a support; and

[0007] At least two brush members are arranged at intervals along the axial direction; each of the brush members includes a spring sheet and a carbon brush; each spring sheet includes a fixed end fixedly connected to the support body and a free end opposite to the fixed end; each carbon brush is fixed to the free end of its corresponding spring sheet and has a contact surface for sliding contact with a slip ring; the contact surface is away from the carbon brush and is outwardly oriented to avoid the support body and all spring sheets.

[0008] In the brush assembly, the fixed end of the spring sheet is connected to the support body, so that the fixed end of the spring sheet is in a stable position. The spring sheet can produce elastic deformation within a certain range, so that the carbon brush fixed at the free end changes its position relative to the fixed end. The center line of the slip ring is parallel or nearly parallel to the axial direction. When the slip ring moves radially toward the brush assembly, the predetermined installation direction of the slip ring is perpendicular or nearly perpendicular to the axial direction. When the predetermined installation direction of the slip ring is parallel or nearly parallel to the outward direction of the contact surface, since the spring sheet is in a free state, the outward direction avoids the support body and all spring sheets, when the slip ring approaches the contact surface of the carbon brush along the predetermined installation direction, the slip ring will not be blocked by the support body and the spring sheet. After the contact surface of the slip ring and the carbon brush just contacts, the slip ring can continue to move along the predetermined installation direction by pushing the carbon brush at the free end of the spring sheet until the slip ring reaches the predetermined position relative to the support body. At this time, the spring sheet undergoes a certain deformation under the pressure of the slip ring, and the carbon brush is stably attached to the surface of the slip ring. Since at least two brush components are arranged axially at intervals, and the outward orientation of the contact surface avoids the support body and all the springs, when installing the slip ring, the slip ring can be directly used to push against the contact surfaces of all the carbon brushes to reach a position that coincides with the predetermined position. Since the brush assembly of the present application does not form a closed inner peripheral area, the slip ring can be directly installed by pushing the carbon brushes radially, eliminating the need to use special tools to push each spring toward the outer periphery, thereby simplifying the assembly process of the inner rotor motor and improving the assembly efficiency of the inner rotor motor.

[0009] In one of the embodiments, on a plane perpendicular to the axial direction, a first center angle corresponding to the projections of all free ends is not greater than a second center angle corresponding to the projections of all fixed ends, wherein the first center angle is the center angle of the span of the projections of all free ends in the circumferential direction about the axis, and the second center angle is the center angle of the span of the projections of all fixed ends in the circumferential direction about the axis, and the axis is the projection of the central axis of the slip ring on a plane perpendicular to the axial direction when the carbon brush and the slip ring are in an assembled state.

[0010] In one embodiment, the two axially adjacent carbon brushes are staggered in the axial direction.

[0011] In one of the embodiments, on a plane perpendicular to the axial direction, a central angle of projections of two axially adjacent carbon brushes about the axis is equal to a central angle of a span of projections of all carbon brushes in the circumferential direction about the axis.

[0012] In one embodiment, the support body includes a mounting portion and a supporting portion, one end of the supporting portion is connected to the mounting portion, and the other end is connected to the fixed end of the spring sheet, and the distance between the free end and the mounting portion is smaller than the distance between the fixed end and the mounting portion.

[0013] In one of the embodiments, a first guide groove is provided on a side surface of the mounting portion for axial guidance and radial limitation when the brush assembly is mounted to a first recessed position of a stator housing.

[0014] In one embodiment, the mounting portion includes at least two seat body parts adjacent to each other in the axial direction, and each of the seat body parts is snap-fitted with the adjacent seat body parts; the supporting portion includes at least two conductive sheets, and one end of each of the conductive sheets is passed through one of the seat body parts, and the other end is connected to the fixed end of one of the spring sheets.

[0015] In one embodiment, each of the base components is provided with a positioning groove, and each of the conductive sheets is at least partially inserted into the positioning groove of its corresponding base component.

[0016] The invention provides a conducting device, comprising a slip ring and a brush assembly. The slip ring comprises at least two mutually insulated conductive rings, and the contact surface of each carbon brush abuts against one of the conductive rings.

[0017] The present invention provides an inner rotor motor, comprising a stator assembly and a rotor assembly rotatably arranged in the stator assembly, wherein the stator assembly comprises a stator shell, a magnet arranged on the inner wall surface of the stator shell, and a brush assembly, wherein the magnet forms a magnetic field that is stationary relative to the stator shell; the rotor assembly comprises an iron core, a rotating shaft inserted in the iron core, and a coil wound on the iron core; a slip ring electrically connected to the coil is sleeved on the rotating shaft, and a contact surface of the brush assembly abuts against the slip ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a three-dimensional schematic diagram of an inner rotor motor according to an embodiment of the present application.

[0019] Figure 2 for Figure 1 The three-dimensional schematic diagram of the inner rotor motor shown in another angle.

[0020] Figure 3 for Figure 2 An exploded schematic diagram of an inner rotor motor is shown.

[0021] Figure 4 for Figure 2 The schematic diagram of the inner rotor motor shown is an exploded view from another angle.

[0022] Figure 5 for Figure 4 The three-dimensional schematic diagram of the brush assembly in the inner rotor motor in the free state is shown.

[0023] Figure 6 for Figure 4The brush assembly in the inner rotor motor is shown as a three-dimensional schematic diagram at another angle.

[0024] Figure 7 for Figure 6 An exploded view of the brush assembly is shown.

[0025] Figure 8 for Figure 6 The brush assembly shown is an exploded schematic diagram at another angle.

[0026] Fig. 9 for Figure 6 A partially exploded schematic diagram of the brush assembly is shown.

[0027] Fig.10a for Figure 5 A top view of the brush assembly is shown.

[0028] Fig.10b for Figure 5 The brush assembly shown is a top view of the carbon brush being abutted by the slip ring.

[0029] Fig.11a It is a three-dimensional schematic diagram of a brush assembly in a free state according to an embodiment of the present application.

[0030] Fig.11b for Fig.11a A top view of the brush assembly is shown.

[0031] Fig.12 It is a side view of an inner rotor motor according to another embodiment of the present application.

[0032] Fig.13 This is a schematic diagram of the inner rotor motor during assembly according to another embodiment of the present application.

[0033] Fig.14 for Fig.13 The top view of the brush assembly in the inner rotor motor is shown, wherein the spring piece is in a state of being supported by the slip ring.

[0034] Reference numerals: 100, inner rotor motor; 20, stator housing; 21, first recess; 22, open end; 23, side wall block; 30, rotor assembly; 31, rotating shaft; 32, iron core; 33, coil; 40, conducting device; 70, brush assembly; 71, support body; 72, mounting portion; 721, inner seat portion; 720, convex rib; 722, outer seat portion; 723, transition portion; 724, seat body sub-component; 725, positioning groove; 726, clamping block; 727, clamping groove; 728, first guide groove; 729, second guide groove; 73 , conductive sheet; 730, bending transition; 731, extension section; 732, lateral extension section; 733, longitudinal extension section; 734, pin section; 735, end; 74, brush member; 75, spring piece; 751, fixed end; 752, free end; 753, folded section; 754, sheet section; 76, carbon brush; 761, contact surface; 90, slip ring; 91, conductive ring; 50, magnet; 80, end cover; 81, bearing member; 82, second recess; F1, axial direction; F2, predetermined installation direction; F3, outward direction; F4, relative direction. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The technical solution provided by the embodiments of the present application is described below in conjunction with the accompanying drawings.

[0039] Combination Figures 1 to 14 As shown, the present application provides an inner rotor motor 100. The inner rotor motor 100 can be used in the automotive field or other industrial fields (such as household appliances, power tools, etc.) to serve as a driving member for outputting driving torque.

[0040] In some embodiments, in combination Figure 3 and Figure 4 As shown, the inner rotor motor 100 includes a stator assembly and a rotor assembly 30 rotatably disposed within the stator assembly.

[0041] In some embodiments, in combination Figure 3 As shown, the stator assembly includes a stator housing 20, a magnet 50 disposed on the inner wall surface of the stator housing 20, and a brush assembly 70. The magnet 50 forms a magnetic field that is stationary relative to the stator housing 20. The rotor assembly 30 includes an iron core 32, a rotating shaft 31 inserted into the iron core 32, and a coil 33 wound around the iron core 32. A slip ring 90 electrically connected to the coil 33 is sleeved on the rotating shaft 31. Specifically, the magnet 50 can be a magnet or other magnetic component.

[0042] In some embodiments, the coil 33 is a multi-phase coil or a single-phase coil, and accordingly, the external power source is an AC power source, such as a multi-phase or single-phase AC power source. When the coil 33 is a multi-phase coil, the number of the conductive rings 91 is not less than the number of phases of the multi-phase coil, wherein each phase coil 33 is electrically connected to one of the conductive rings 91, so that each phase coil 33 can be connected to the external power source through a conductive ring 91, and the number of the conductive rings 91 is preferably equal to the number of phases of the multi-phase coil. When the coil 33 is a single-phase coil, the number of the conductive rings 91 is two, and the two conductive rings 91 are respectively connected to the head and tail ends of the single-phase coil, so that the head and tail ends of the single-phase coil can be connected to the external power source through a conductive ring 91.

[0043] In some embodiments, in combination Figure 3 As shown, the magnets 50 are evenly spaced along the circumferential direction of the stator housing 20, and adjacent magnets 50 have opposite polarities, that is, among two adjacent magnets 50, the radial inner end of one is an N pole and the radial outer end is an S pole, and the radial inner end of the other is an S pole and the radial outer end is an N pole, so that alternating N and S poles are formed in the circumferential direction in the stator housing 20, forming a stator magnetic field that is stationary relative to the stator housing 20. In some embodiments, the magnets 50 are made of weak magnetic materials, such as ferrite. The magnets 50 can also be made of strong magnetic materials, such as neodymium iron boron. The magnets 50 can also be electromagnets.

[0044] In some embodiments, in combination Figure 3As shown, the stator shell 20 is provided with a first recess 21. In some embodiments, the first recess 21 is provided at the edge of the open end 22 of the stator shell 20. In some embodiments, the iron core 32 may be formed by stacking a plurality of silicon steel sheets, including a yoke portion sleeved with the rotating shaft 31 and a plurality of teeth portions extending radially outward from the yoke portion. The rotating shaft 31 is fixedly plugged into the yoke portion of the iron core 32, and both ends of the rotating shaft 31 extend out of the iron core 32 to transmit power outward. The coil 33 is wound around each tooth portion, and adjacent teeth portions are spaced apart in the circumferential direction to form a winding groove for winding the coil 33.

[0045] In some embodiments, in combination Figure 3 and Figure 4 As shown, the inner rotor motor 100 further includes an end cover 80. The end cover 80 is used to cover the open end 22 of the stator housing 20. In some embodiments, the end cover 80 is embedded in the inner side of the open end 22 of the stator housing 20. In some embodiments, the inner rotor motor 100 further includes a bearing member 81. The bearing member 81 can be disposed between the stator housing 20 and the rotating shaft 31. The bearing member 81 can also be disposed between the end cover 80 and the rotating shaft 31. In some embodiments, the inner rotor motor 100 further includes a bearing member 81. The bearing member 81 can be disposed between the end cover 80 and the rotating shaft 31. Fig.13 As shown, the end cap 80 is provided with a second recess 82. In some embodiments, the second recess 82 extends from the outer peripheral edge of the end cap 80 radially toward the center of the end cap 80.

[0046] Combination Figure 3 and Figure 4 As shown, the present application provides a conducting device 40. The conducting device 40 is used to conduct current to the coil 33. When current passes through the coil 33, the coil 33 is subjected to the electromagnetic force and rotates relative to the stator housing 20. In some embodiments, the conducting device 40 includes a slip ring 90 and a brush assembly 70. The slip ring 90 is fixedly sleeved on the rotating shaft 31 and rotates with the rotating shaft 31. The slip ring 90 is electrically connected to the coil 33. The brush assembly 70 is in a fixed position relative to the stator housing 20. The brush assembly 70 and the slip ring 90 are electrically connected through sliding contact.

[0047] In some embodiments, in combination Figure 3 As shown, the slip ring 90 includes at least two mutually insulated conductive rings 91. The at least two conductive rings 91 are sequentially spaced apart along the axial direction F1. In some embodiments, the diameters of the at least two conductive rings 91 may be the same or different.

[0048] Combination Figure 5 and Figure 6As shown, the present application also provides a brush assembly 70, which can be applied to at least the above-mentioned conduction device 40 or the above-mentioned inner rotor motor 100. In some embodiments, the brush assembly 70 includes: a support body 71 and at least two brush members 74 spaced apart along the axial direction F1. Each brush member 74 includes a spring 75 and a carbon brush 76. Each spring 75 includes a fixed end 751 fixedly connected to the support body 71 and a free end 752 opposite to the fixed end 751. Each carbon brush 76 is fixed to the free end 752 of its corresponding spring 75 and has a contact surface 761 for sliding contact with a slip ring 90. The contact surface 761 is away from the outward direction F3 of the carbon brush 76 and is avoided around the support body 71 and all springs 75.

[0049] Specifically, since the fixed end 751 of the spring sheet 75 is connected to the support body 71, the fixed end 751 of the spring sheet 75 is in a stable position. The spring sheet 75 can produce elastic deformation within a certain range, so that the carbon brush 76 fixed to the free end 752 changes position relative to the fixed end 751. The center line of the slip ring 90 is parallel or nearly parallel to the axial direction F1. When the slip ring 90 moves from the radial direction to the brush assembly 70, the predetermined installation direction F2 of the slip ring 90 is perpendicular or nearly perpendicular to the axial direction F1. When the predetermined installation direction F2 of the slip ring 90 is parallel or nearly parallel to the outward direction F3 of the contact surface 761, since the outward direction F3 avoids the support body 71 and all the spring sheets 75 in the free state, when the slip ring 90 approaches the contact surface 761 of the carbon brush 76 along the predetermined installation direction F2, the slip ring 90 will not be blocked by the support body 71 and the spring sheet 75. After the contact surface 761 of the slip ring 90 and the carbon brush 76 just come into contact, the slip ring 90 can continue to move along the predetermined installation direction F2 by pushing the carbon brush 76 at the free end 752 of the spring sheet 75, until the slip ring 90 reaches the predetermined position relative to the support body 71. At this time, the spring sheet 75 is deformed to a certain extent under the pressure of the slip ring 90, and the carbon brush 76 is stably attached to the surface of the slip ring 90. Since at least two brush members 74 are arranged at intervals in the axial direction F1, and the contact surface 761 is directed outward toward F3 to avoid the support body 71 and all the spring sheets 75, when installing the slip ring 90, the slip ring 90 can be directly used to push against the contact surfaces 761 of all the carbon brushes 76 to reach a position that coincides with the predetermined position. Since the brush assembly 70 of the present application does not form a closed inner peripheral area, the slip ring 90 can be installed directly by pushing the carbon brush 76 radially, eliminating the need to use special tools to push each spring piece 75 toward the outer periphery, thereby helping to simplify the assembly process of the inner rotor motor 100 and improve the assembly efficiency of the inner rotor motor 100.

[0050] Specifically, combined Figure 5 and Fig.10aAs shown, the face side of the spring sheet 75 faces away from the support body 71, and the back side of the spring sheet 75 faces the support body 71. The carbon brush 76 is arranged on the face side of the spring sheet 75. As for the outward direction F3 of the contact surface 761 avoiding the spring sheet 75, it can be understood that the outward direction F3 of the contact surface 761 avoids the face side of the spring sheet 75 and avoids the extension space of the face side of the spring sheet 75 along the axial direction F1. In some embodiments, the outward direction F3 of the contact surface 761 can point to the extension space of the back side of the spring sheet 75 along the axial direction F1.

[0051] In some embodiments, in combination Figure 5 and Fig.10a As shown, the support body 71 includes a mounting portion 72 and a supporting portion, one end of the supporting portion is connected to the mounting portion 72, and the other end is connected to the fixed end 751 of the spring sheet 75, and the distance between the free end 752 and the mounting portion 72 is smaller than the distance between the fixed end 751 and the mounting portion 72. Specifically, the support body 71 is mounted on other devices through the mounting portion 72. The supporting portion is used to provide support for the fixed end 751 of the spring sheet 75, so that the fixed end 751 of the spring sheet 75 is in a stable position. Specifically, in a free state, the distance between the free end 752 and the mounting portion 72 is smaller than the distance between the fixed end 751 and the mounting portion 72, and the free end 752 of the spring sheet 75 and the mounting portion 72 are arranged relative to each other at intervals along the predetermined mounting direction F2 of the slip ring 90. When the slip ring 90 pushes the carbon brush 76 along the predetermined mounting direction F2, the spring sheet 75 can produce more obvious elastic deformation, and the carbon brush 76 is subjected to more sufficient elastic force, so that it can maintain stable sliding contact with the slip ring 90. In some embodiments, the mounting portion 72 has an insulating property, thereby preventing the conductive sheet 73 from short-circuiting with other devices.

[0052] In some embodiments, in combination Figure 3 and Figure 6 As shown, the support body 71 is mounted on the stator housing 20 through the mounting portion 72. In other embodiments, the support body 71 is mounted on the end cover 80 through the mounting portion 72. In some embodiments, the mounting portion 72 of the support body 71 is clamped in the first recess 21, so that after the support body 71 is at least partially accommodated in the stator housing 20, the brush assembly 70 can be in a relatively stable position.

[0053] In some embodiments, in combination Figure 3 and Figure 6As shown, the side of the mounting portion 72 is provided with a first guide groove 728, which performs axial F1 guidance and radial limiting when the brush assembly 70 is installed to the first recess 21 of the stator shell 20. Specifically, the first guide groove 728 is provided on the outer side of the mounting portion 72. When the brush assembly 70 is installed to the stator shell 20, the edge portion of the stator shell 20 used to define the first recess 21 is inserted into the first guide groove 728 along the axial direction F1. The edge of the first recess 21 plays an axial F1 guiding role for the mounting portion 72. In addition, the width of the end of the first guide groove 728 corresponds to the thickness of the stator shell 20, thereby limiting the relative position of the mounting portion 72 and the stator shell 20 in the radial direction. In some embodiments, the two edge portions of the stator shell 20 used to define the first recess 21 can form an interference fit with the inner wall surface of the first guide groove 728.

[0054] In some embodiments, in combination Figure 6 As shown, the mounting portion 72 includes an inner seat portion 721, an outer seat portion 722 and a transition portion 723. The inner seat portion 721 is used to be accommodated in the stator case 20. The outer seat portion 722 is arranged outside the stator case 20. The transition portion 723 is connected between the inner seat portion 721 and the outer seat portion 722. The width of the inner seat portion 721 along the circumferential direction of the stator case 20 is greater than the width of the first recess 21 along the circumferential direction of the stator case 20, and the width of the outer seat portion 722 along the circumferential direction of the stator case 20 is greater than the width of the first recess 21 along the circumferential direction of the stator case 20. The width of the transition portion 723 along the circumferential direction of the stator case 20 is less than or equal to the width of the first recess 21 along the circumferential direction of the stator case 20. The first guide groove 728 is formed between the inner seat portion 721 and the outer seat portion 722 in the radial direction. When the transition portion 723 is accommodated in the first recess 21, the inner seat portion 721 is accommodated in the stator case 20, and the outer seat portion 722 is located outside the stator case 20. In some embodiments, a portion of the surface of the inner seat portion 721 is arranged opposite to the inner wall of the stator case 20, and a convex rib 720 is provided on the portion of the surface of the inner seat portion 721. The convex rib 720 is used to abut against the inner wall of the stator case 20, thereby increasing the friction between the inner seat portion 721 and the inner wall of the stator case 20, and improving the installation stability between the mounting portion 72 and the stator case 20.

[0055] In some embodiments, in combination Fig.13As shown, the mounting portion 72 is provided with a second guide groove 729, which is used for radial guidance and axial F1 limiting when the brush assembly 70 is docked to the second recessed position 82 of the end cover 80. Specifically, one side of the mounting portion 72 is away from the inside of the stator case 20, and the second guide groove 729 is provided on the side of the mounting portion 72. When the brush assembly 70 is docked and installed with the end cover 80, the edge portion of the end cover 80 near the second recessed position 82 is radially inserted into the second guide groove 729. The second guide groove 729 limits the relative movement direction of the edge portion of the end cover 80 near the second recessed position 82. In addition, the width of the second guide groove 729 corresponds to the thickness of the end cover 80, thereby limiting the relative position of the mounting portion 72 and the end cover 80 in the axial direction F1.

[0056] In some embodiments, in combination Fig.12 As shown, the inner rotor motor 100 further includes a side wall block 23. The support body 71 is mounted on the side wall block 23 through the mounting portion 72. The side wall block 23 cooperates with the support body 71 to form a structure capable of surrounding the brush member 74. The side wall block 23 and the support body 71 are connected to the open end 22 of the stator housing 20. After the slip ring 90 abuts the free end 752 of the spring sheet 75 until it is deformed, the side wall block 23 moves from the side of the slip ring 90 facing away from the support body 71 to the support body 71, and is connected to the support body 71 to form a structure surrounding the slip ring 90. In some embodiments, the edge of the side wall block 23 is arc-shaped. The side wall block 23 and the support body 71 form a mutual circumferential relationship in angle, so as to form a structure surrounding the slip ring 90 in the circumferential direction. In some embodiments, the support body 71 and the side wall block 23 are confined between the end cover 80 and the open end 22 of the stator housing 20. In some embodiments, the end cover 80 may be fixedly connected to the stator housing 20 , and then the end cover 80 and the open end 22 of the stator housing 20 clamp and fix the side wall block 23 and the support body 71 from both sides respectively.

[0057] In some embodiments, in combination Figures 6 to 9As shown, the mounting portion 72 includes at least two seat body parts 724 adjacently arranged along the axial direction F1, and each seat body part 724 is snap-fitted with the adjacent seat body part 724. The supporting portion includes at least two conductive sheets 73, one end of each conductive sheet 73 is passed through a seat body part 724, and the other end is connected to a fixed end 751 of a spring sheet 75. Specifically, the fixed end 751 of the spring sheet 75 is connected to the conductive sheet 73. Through the snap-fitting between the seat body parts 724, a stable positional relationship can be maintained between different conductive sheets 73. When it is found that some of the seat body parts 724 or the conductive sheets 73 are defective, by releasing the snap-fitting between the seat body parts 724, the defective seat body parts 724 or the conductive sheets 73 can be easily replaced from the support body 71, thereby avoiding the need to scrap the brush assembly 70 as a whole. Since the conductive sheet 73 and the spring sheet 75 are respectively conductive, after the position of the conductive sheet 73 is limited by the mounting portion 72, the conductive sheet 73 can not only support the spring sheet 75, but the spring sheet 75 can also be connected to an external power source through the conductive sheet 73, thereby simplifying the structure of the brush assembly 70. In some embodiments, both ends of the conductive sheet 73 are exposed outside the mounting portion 72.

[0058] In some embodiments, in combination Figure 7 and Figure 8 As shown, one of the two seat body sub-components 724 disposed adjacent to each other along the axial direction F1 is connected to a clamping block 726, and the clamping block 726 protrudes toward the other seat body sub-component 724 relative to the connected seat body sub-component 724. The other seat body sub-component 724 is provided with a clamping groove 727. The clamping block 726 is used to be embedded in the clamping groove 727, so that each seat body sub-component 724 is clamped and matched with the adjacent seat body sub-component 724. In some embodiments, the clamping block 726 is interference-fitted with the inner wall of the clamping groove 727, so as to improve the strength of the bonding force between the two adjacent seat body sub-components 724 and make the structure of the mounting portion 72 more stable.

[0059] In some embodiments, in combination Figure 7 As shown, the block 726 and the slot 727 are disposed on the inner seat portion 721 of the mounting portion 72, that is, disposed on the side of the mounting portion 72 facing the slip ring 90. In some embodiments, Figure 8As shown, the block 726 and the slot 727 are disposed on the outer seat portion 722 of the mounting portion 72, that is, disposed on the side of the mounting portion 72 facing away from the slip ring 90. In some embodiments, the previous seat body sub-component 724 along the axial direction F1 is provided with a block 726, and the block 726 protrudes toward the next seat body sub-component 724 along the axial direction F1. The next seat body sub-component 724 is provided with a slot 727, and the slot 727 of the next seat body sub-component 724 opens toward the previous seat body sub-component 724 to accommodate the block 726 of the previous seat body sub-component 724. Since the distribution of the block 726 and the slot 727 is directional, when the direction of the seat body component 724 is flipped incorrectly, the block 726 of the seat body component 724 will abut against the block 726 of another seat body component 724, so that the two seat body components 724 cannot be assembled in the wrong direction, which is beneficial to ensure the misaligned distribution of adjacent conductive sheets 73 or brush components 74.

[0060] In some embodiments, in combination Figure 7 and Fig. 9 As shown, each seat body sub-component 724 is provided with a positioning groove 725, and each conductive sheet 73 is at least partially inserted into the positioning groove 725 on its corresponding seat body sub-component 724, so that the conductive sheet 73 and the corresponding seat body sub-component 724 maintain a stable positional relationship. In some embodiments, the conductive sheet 73 is provided with an interference fit with the inner wall surface of the positioning groove 725. In some embodiments, the opening of the positioning groove 725 of one seat body sub-component 724 faces the other seat body sub-component 724. Specifically, when the seat body sub-component 724 is disassembled, the opening of the positioning groove 725 is exposed, so that the conductive sheet 73 can be taken out from the seat body sub-component 724.

[0061] In some embodiments, for two seat body sub-components 724 adjacent to each other along the axial direction F1, a portion of the conductive sheet 73 is inserted into the positioning groove 725 of one of the seat body sub-components 724, and the other portion is inserted into the positioning groove 725 of the other seat body sub-component 724. Since the conductive sheet 73 is inserted into the two adjacent seat body sub-components 724 at the same time, the conductive sheet 73 can be used to provide positioning for the two adjacent seat body sub-components 724, so that the two adjacent seat body sub-components 724 can be more accurately docked. When the conductive sheet 73 forms an interference fit with the inner wall of the positioning groove 725, the friction between the conductive sheet 73 and the seat body sub-component 724 can increase the bonding strength between the two adjacent seat body sub-components 724, so that the two adjacent seat body sub-components 724 can maintain a more stable relative position relationship.

[0062] In some embodiments, in combination Fig.10a and Fig.10b As shown, one bent end of the conductive sheet 73 is welded and fixed to one end of the elastic sheet 75 .

[0063] In some embodiments, in combination Figure 7 and Fig. 9 As shown, the conductive sheet 73 includes an extension section 731, a lateral extension section 732 and a longitudinal extension section 733. The lateral extension section 732 is connected between the extension section 731 and the longitudinal extension section 733. The extension section 731 and the longitudinal extension section 733 are bent relative to the lateral extension section 732 in different directions. The fixed end 751 of the spring 75 is connected to the longitudinal extension section 733. Since the lateral extension section 732 is bent relative to the extension section 731, when the extension sections 731 of each conductive sheet 73 are substantially parallel to each other, by making the lateral extension sections 732 of adjacent conductive sheets 73 extend relative to the extension sections 731 in opposite directions, the longitudinal extension sections 733 of the conductive sheets 73 adjacent along the axial direction F1 can be staggered, so that a larger insulation space is formed between the two longitudinal extension sections 733 opposite to each other along the axial direction F1, thereby ensuring the insulation effect between the two adjacent conductive sheets 73 when the longitudinal extension section 733 is exposed outside the mounting portion 72.

[0064] In some embodiments, in combination Figure 7 and Fig. 9 As shown, the extension direction of the side extension section 732 relative to the extension section 731 is parallel or nearly parallel to the relative direction F4 between the two fixed ends 751. The extension direction of the longitudinal extension section 733 relative to the side extension section 732 is substantially parallel to the predetermined installation direction F2. Fig.13 and Fig.14 As shown, the longitudinal section 733 is bent away from the end 735 of the lateral section 732, and the fixed end 751 of the spring 75 is connected to the end 735 of the longitudinal section 733 and has a corresponding bending structure, so that the contact area between the end 735 of the lateral section 732 and the fixed end 751 of the spring 75 can be increased within a limited space, thereby ensuring the stability of current conduction.

[0065] In some embodiments, in combination Figure 7 and Fig. 9 As shown, the conductive sheet 73 also includes a pin segment 734 connected to the extension segment 731. The pin segment 734 is exposed outside the mounting portion 72. The pin segment 734 is used to connect to an external power source. In some embodiments, for two conductive sheets 73 adjacent to each other along the axial direction F1, the pin segments 734 of the two conductive sheets 73 are staggered, thereby increasing the relative distance between the two pin segments 734 and improving the insulation.

[0066] In some embodiments, in combination Figure 7 and Fig. 9 As shown, the extension direction of the extension section 731 is parallel to the radial direction of the stator case 20 , so that the extension section 731 can extend inside and outside the stator case 20 with a shorter length.

[0067] In some embodiments, in combination Fig.14As shown, when the carbon brush 76 and the slip ring 90 are in an assembled state, the projection of the central axis of the slip ring 90 on a plane perpendicular to the axial direction F1 is the axis, the central angle of the span of the projection of all free ends 752 in the circumferential direction with respect to the axis is a first central angle β1, and the central angle of the span of the projection of all fixed ends 751 in the circumferential direction with respect to the axis is a second central angle β2. Specifically, when the inner rotor motor 100 is running, the rotor assembly 30 rotates around the axis.

[0068] In some embodiments, in combination Fig.14 As shown, on a plane perpendicular to the axial direction F1, the first center angle β1 corresponding to the projection of all free ends 752 is not greater than the second center angle β2 corresponding to the projection of all fixed ends 751, so all free ends 752 are within the circumferential distribution range of all fixed ends 751. Since the carbon brush 76 is connected to the free end 752, when the slip ring 90 approaches the moving carbon brush 76 along the predetermined installation direction F2, even when the outer diameter of the slip ring 90 is small, it can ensure that each carbon brush 76 can contact the slip ring 90 respectively, thereby reducing the restriction on the outer diameter of the carbon brush 76. In some embodiments, the first center angle β1 and the second center angle β2 are both center angles close to the mounting portion 72, so that the mounting portion 72, the support portion and the brush assembly 70 are all on the same side of the slip ring 90, which is convenient for installation.

[0069] In some embodiments, the spring piece 75 is formed by processing a conductive metal sheet.

[0070] In some embodiments, in combination Fig.10a and Fig.10b As shown, two carbon brushes 76 adjacent to each other along the axial direction F1 are staggered in the axial direction F1, thereby increasing the circumferential span of all carbon brushes 76. When the slip ring 90 abuts against all carbon brushes 76, the spring pieces 75 connected to all carbon brushes 76 provide a wider force application angle to the slip ring 90, preventing the slip ring 90 from being bounced to the fixed end 751 by the elastic force of the spring pieces 75.

[0071] In some embodiments, in combination Figure 5As shown, on a plane perpendicular to the axial direction F1, the central angle of the projection of two adjacent carbon brushes 76 in the axial direction F1 in the circumferential direction about the axis is equal to the central angle of the projection of all carbon brushes 76 in the circumferential direction about the axis, so all carbon brushes 76 are distributed in a relatively concentrated area in the circumferential direction, and form an alternating staggered structure, so that the force angle of each carbon brush 76 on the slip ring 90 is relatively uniform, which is conducive to improving the stability of the slip ring 90 during installation. In some embodiments, by using spring pieces 75 of uniform length, adjacent spring pieces 75 are alternately staggered, so that the central angle of the projection of two adjacent carbon brushes 76 in the axial direction F1 about the axis is equal to the central angle of the projection of all carbon brushes 76 in the circumferential direction about the axis. For example, when the number of the brush assemblies 70 is two, the two brush assemblies 70 can be staggered in the axial direction F1, so that the spring pieces 75 of the two brush assemblies 70 can resist the slip ring 90 in different directions, thereby making the slip ring 90 in a more stable state during rotation. When there are three brush assemblies 70 , two adjacent brush assemblies 70 are staggered in the axial direction F1 , and two alternate brush assemblies 70 are aligned in the axial direction F1 , so that the slip ring 90 is always subjected to opposing elastic forces during rotation, thereby improving stability.

[0072] In some embodiments, in combination Figure 3 and Fig.14 As shown, the contact surface 761 of the carbon brush 76 abuts against the slip ring 90. Specifically, the contact surface 761 of each carbon brush 76 abuts against one of the conductive rings 91. Specifically, when the carbon brush 76 is pushed by the slip ring 90, the deformation of the spring sheet 75 generates an elastic force on the carbon brush 76, so that the contact surface 761 of the carbon brush 76 maintains abutment with the conductive ring 91. In some embodiments, two spring sheets 75 adjacent to each other along the axial direction F1 are spaced apart from each other, thereby maintaining the insulation between adjacent conductive rings 91.

[0073] In some embodiments, the carbon brush 76 and the spring sheet 75 are fixedly arranged by welding, thereby helping to ensure the connection stability and conductivity between the carbon brush 76 and the spring sheet 75 .

[0074] The spring piece 75 may be roughly in the shape of a "√", such as Fig.11a and 11b As shown, it can also be other shapes with multiple bends, such as Fig.13 and Fig.14 The present invention does not limit the specific shape of the spring piece 75. In some embodiments, combined with Fig. 9 and Fig.11bAs shown, the spring piece 75 includes a folding section 753 and a sheet-shaped section 754 connected to the folding section 753. The folding section 753 has greater rigidity than the sheet-shaped section 754. The free end 752 of the spring piece 75 is arranged at the folding section 753. A bending transition 730 is formed on the inner side of the conductive sheet 73. A portion of the sheet-shaped section 754 away from the folding section 753 is attached to the conductive sheet 73, and a portion of the sheet-shaped section 754 close to the folding section 753 is separated from the conductive sheet 73 via the bending transition 730. Specifically, the folding section 753 has a bending transition shape, and by setting the amplitude of the folding section 753, the angle of the carbon brush 76 relative to the fixed end 751 of the spring piece 75 can be adjusted. The folding section 753 has a more stable shape relative to the sheet-shaped section 754, and the carbon brush 76 is fixedly connected to the folding section 753, so that a stable contact area can be maintained between the carbon brush 76 and the folding section 753. A portion of the sheet-shaped segment 754 close to the folded segment 753 is separated from the conductive sheet 73 via the bending transition 730. Therefore, when the carbon brush 76 is pushed by the slip ring 90, this portion of the sheet-shaped segment 754 undergoes bending elastic deformation. Compared with the bending elastic deformation of the sheet-shaped segment 754, the bending elastic deformation can make the sheet-shaped segment 754 have better shape recovery, so that the carbon brush 76 can more reliably maintain contact with the slip ring 90. In some embodiments, the end of the conductive sheet 73 connected to the elastic sheet 75 is bent in a direction away from the free end 752, so that a bending transition 730 is formed on the inner side of the conductive sheet 73.

[0075] In some embodiments, in combination Fig. 9 As shown, the edge of the folded segment 753 is provided with a folding structure. In some other embodiments, the thickness of the folded segment 753 is greater than the thickness of the sheet segment 754. Specifically, along the direction close to the folded segment 753, a part of the sheet segment 754 begins to separate from the conductive sheet 73 from the bending transition 730. The shape of the edge of the sheet segment 754 is close to a straight line. In some embodiments, the free end 752 of the spring sheet 75 is bent in a direction away from the support body 71. After the free end 752 of the spring sheet 75 is bent in a direction away from the support body 71, the distance of the free end 752 of the spring sheet 75 relative to the inner side of the support body 71 increases, so that even when the distance of the conductive ring 91 relative to the support body 71 is large, the free end 752 of the spring sheet 75 can be fully in contact with the outer periphery of the conductive ring 91, and it helps to increase the pressure between the free end 752 of the spring sheet 75 and the conductive ring 91.

[0076] In some embodiments, in combination Figure 5 and 10a As shown, for two spring sheets 75 adjacent to each other along the axial direction F1, the fixed ends 751 of the two spring sheets 75 are located in the same diameter direction of the slip ring 90 (for example, Fig.10aThe carbon brush 76 is located between the two fixed ends 751 in the circumferential direction. In the plane projection perpendicular to the axial direction F1, the fixed ends 751 of the two adjacent spring pieces 75 are located in the same diameter direction of the slip ring 90. The slip ring 90 enters between the two fixed ends 751 along the predetermined installation direction F2. Since the fixed ends 751 of the two adjacent spring pieces 75 are located in the same diameter direction of the slip ring 90, the angle of the two adjacent carbon brushes 76 relative to the slip ring 90 can be increased, thereby increasing the angular contact range between the slip ring 90 and all the carbon brushes 76, and preventing the slip ring 90 from sliding off the contact surface 761 of the carbon brush 76 due to the small support area during assembly, thereby improving the position stability of the slip ring 90 during assembly.

[0077] In some embodiments, in combination Fig.10a and Fig.10b As shown, in the free state of the spring sheet 75, the direction from the fixed end 751 to the free end 752 is inclined toward the mounting portion 72 relative to the relative direction F4 between the two fixed ends 751. Therefore, when assembling the slip ring 90, the slip ring 90 needs to first enter the relative space between the fixed ends 751 of two adjacent spring sheets 75, and then continue to move close to the mounting portion 72 along the predetermined installation direction F2 before it comes into contact with the carbon brush 76. During the assembly process of the slip ring 90, the fixed end 751 has a stable position relative to the support body 71, so that the fixed end 751 can play a certain limiting role on the slip ring 90, preventing the slip ring 90 from being bounced along the relative direction F4 due to the elastic force of the spring sheet 75. In some embodiments, the distance between the two fixed ends 751 along the relative direction F4 is greater than the outer diameter of the slip ring 90.

[0078] In another embodiment, the distance between the two fixed ends 751 along the relative direction F4 may be smaller than the outer diameter of the slip ring 90 . The fixed ends 751 of two adjacent spring sheets 75 and the contact surface 761 enclose an arc whose curvature radius is not smaller than the radius of the slip ring 90 .

[0079] In some embodiments, in combination Figure 5 and Fig.11a As shown, at least two conductive sheets 73 are sequentially arranged along the axial direction F1. For two conductive sheets 73 adjacent to each other along the axial direction F1, a section where the two conductive sheets 73 are connected to the fixed end 751 is staggered, and the conductive sheet 73 extends to the fixed end 751 of the corresponding elastic sheet 75 along a shorter path. For two conductive sheets 73 separated by a conductive sheet 73 in the middle along the axial direction F1, a section where the two conductive sheets 73 are connected to the fixed end 751 is separated by a larger distance along the axial direction F1, and the distance is at least greater than the size of the conductive sheet 73 along the axial direction F1, so that the insulation between the conductive sheets 73 can be ensured.

[0080] The above implementation modes are merely descriptions of the preferred implementation modes of the present application, and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present application.

Claims

1. A brush assembly, characterized in that: include: Support body; and At least two brush members are arranged at intervals along the axial direction; each of the brush members includes a spring sheet and a carbon brush; each spring sheet includes a fixed end fixedly connected to the support body and a free end opposite to the fixed end; each carbon brush is fixed to the free end of its corresponding spring sheet and has a contact surface for sliding contact with a slip ring; the contact surface is away from the carbon brush and is outwardly oriented to avoid the support body and all spring sheets.

2. The brush assembly according to claim 1, characterized in that: On a plane perpendicular to the axial direction, a first center angle corresponding to the projections of all free ends is not greater than a second center angle corresponding to the projections of all fixed ends, wherein the first center angle is the center angle of the span of the projections of all free ends in the circumferential direction about the axis, and the second center angle is the center angle of the span of the projections of all fixed ends in the circumferential direction about the axis, and the axis is the projection of the central axis of the slip ring on a plane perpendicular to the axial direction when the carbon brush and the slip ring are in an assembled state.

3. The brush assembly according to claim 2, characterized in that: The two axially adjacent carbon brushes are arranged staggered in the axial direction.

4. The brush assembly according to claim 3, characterized in that: On a plane perpendicular to the axial direction, a central angle of projections of two axially adjacent carbon brushes about the axis is equal to a central angle of a span of projections of all carbon brushes in the circumferential direction about the axis.

5. The brush assembly according to any one of claims 1 to 2, characterized in that: The support body includes a mounting portion and a supporting portion, one end of the supporting portion is connected to the mounting portion, and the other end is connected to the fixed end of the spring sheet, and the distance between the free end and the mounting portion is smaller than the distance between the fixed end and the mounting portion.

6. The brush assembly according to claim 5, characterized in that A first guide groove is provided on the side of the mounting portion for axial guidance and radial limitation when the brush assembly is mounted to the first recessed position of a stator housing.

7. The brush assembly according to claim 5, characterized in that The mounting portion is provided with a second guide groove for radial guidance and axial limitation when the brush assembly is docked to a second recessed position of an end cover.

8. The brush assembly according to claim 5, characterized in that The mounting portion includes at least two seat body parts adjacently arranged along the axial direction, and each of the seat body parts is snap-fitted with the adjacent seat body parts; the supporting portion includes at least two conductive sheets, one end of each of the conductive sheets is passed through one of the seat body parts, and the other end is connected to the fixed end of one of the spring sheets.

9. The brush assembly according to claim 8, characterized in that Each of the seat body sub-components is provided with a positioning groove, and each of the conductive sheets is at least partially inserted into the positioning groove of the corresponding seat body sub-component.

10. A conducting device, characterized in that: It comprises a slip ring and a brush assembly as claimed in any one of claims 1 to 9, wherein the slip ring comprises at least two conductive rings insulated from each other, and a contact surface of each carbon brush abuts against one of the conductive rings.

11. An inner rotor motor, comprising a stator assembly and a rotor assembly rotatably disposed in the stator assembly, characterized in that: The stator assembly includes a stator shell, a magnet arranged on the inner wall surface of the stator shell, and a brush assembly according to any one of claims 1 to 9, wherein the magnet forms a magnetic field that is stationary relative to the stator shell; the rotor assembly includes an iron core, a rotating shaft inserted into the iron core, and a coil wound around the iron core; a slip ring electrically connected to the coil is sleeved on the rotating shaft, and a contact surface of the brush assembly abuts against the slip ring.

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