Motor and motor carbon brush assembly thereof

Abstract

The utility model discloses a motor carbon brush assembly which comprises a carbon sleeve and a carbon brush which are sleeved with each other, a brush braid is arranged at the top of the carbon brush, the carbon sleeve is provided with a functional groove and enables the brush braid to extend out of the functional groove, and a limiting piece is arranged based on the functional groove and used for temporarily fixing the brush braid so that the carbon brush can retract into the carbon sleeve. According to the motor carbon brush assembly, the bent and extended three-dimensional space structure of the brush braid is utilized, and the limiting piece is arranged outside the carbon sleeve to temporarily limit the brush braid, so that the carbon brush is temporarily fixed, and direct contact with the carbon brush is avoided.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to a motor and its carbon brush assembly. Background Technology

[0002] The working principle of a brushed motor is to place brushes and a commutator between the stator and rotor. It generates electromagnetic torque to drive the rotor to rotate relative to the stator, thereby outputting torque. After assembly, the carbon brushes need to contact the commutator. To meet operational requirements, the carbon brushes are usually equipped with a flexible clamping structure to ensure good contact with the commutator. However, this design makes brushed motor assembly inconvenient. The pre-extended tip of the carbon brush creates spatial resistance during the assembly of the commutator or stator. Current methods simply involve using ordinary tools such as screwdrivers to pry the carbon brushes open, temporarily retracting them into the carbon sleeve to create space for assembling the commutator and stator. However, when a motor has multiple brushes, this may require multiple workers, hindering assembly efficiency. Utility Model Content

[0003] This application addresses the shortcomings of existing methods by proposing a motor and its carbon brush assembly to solve the technical problem that related technologies require human intervention and are inconvenient for motor assembly.

[0004] In a first aspect, this application provides a motor carbon brush assembly, which includes a carbon sleeve and a carbon brush nested together. The top of the carbon brush is provided with a brush braid that bends outward. The carbon sleeve is provided with a functional groove, and the brush braid extends outward from the functional groove. A limiting member is provided based on the functional groove to temporarily fix the brush braid, so that the carbon brush retracts into the carbon sleeve.

[0005] Furthermore, the carbon sleeve includes a top wall, a side wall adjoining the top wall, a rivet extending downward from the side wall, and a rear wall blocking the rear of the carbon sleeve; the top wall has a first functional groove along its longitudinal direction, so that the brush braid extends out from the first functional groove.

[0006] Alternatively, when the limiting member is used to temporarily fix the proximal end of the brush braid, the limiting member is disposed on the upper surface of the first functional groove and / or the top wall.

[0007] Alternatively, the limiting member may include a movable limiting post, which includes a column body, a suction cup disposed below the column body, and an operating disc disposed above the column body, the column body being defined by a cylindrical wall that can be folded multiple times longitudinally.

[0008] Alternatively, the rear wall may maintain gaps with the top wall and side wall respectively to form a second functional groove.

[0009] Alternatively, when the limiting member is used to temporarily fix the distal end of the brush braid, the limiting member is disposed in the second functional groove and / or the area of ​​the top wall near the second functional groove.

[0010] Alternatively, the limiting member includes a hook extending upward from the rear edge of the top wall, the hook being connected to the carbon sleeve via an elastic sheet, such that the hook retracts into the carbon sleeve when pressed; or, the limiting member includes a limiting piece insertable from the second functional slot, the limiting piece including at least three coplanar concentric support petals, each support petal being connected via a convergence portion, such that when any two of the support petals are radially pressed, the remaining support petals retract inward toward the center, and a single support petal is used to temporarily fix the brush braid.

[0011] Specifically, the gathering part includes a plurality of folding units arranged in a circular pattern converging at the center, with adjacent folding units being mirror-symmetrical; each folding unit includes an upper convex edge, a transition edge, and a lower concave edge arranged from top to bottom relative to the circular surface, as well as a connecting surface connecting each edge, with adjacent connecting surfaces being able to move around a common edge.

[0012] Alternatively, the limiting piece may further include a vertical petal, which is connected to the gathering portion and is coplanar and concentrically disposed with the support petal, and the thickness of the vertical petal is less than that of the support petal.

[0013] Secondly, this application also provides an electric motor, including a stator and a rotor that cooperate with each other, wherein the stator employs the aforementioned motor carbon brush assembly.

[0014] The beneficial technical effects of the technical solutions provided in this application include:

[0015] (1) The motor carbon brush assembly of this application utilizes the three-dimensional spatial structure of the brush braid's bending and extension, and sets a limiting member outside the carbon sleeve to temporarily limit the brush braid, so as to temporarily fix the carbon brush and avoid direct contact with the carbon brush.

[0016] (2) In the motor carbon brush assembly of this application, the limiting member is set in the functional slot and / or the area around the functional slot, without changing the carbon brush structure. Furthermore, when the limiting member is configured to be movable and detachable, the structure of the carbon sleeve does not need to be changed, which is conducive to the promotion and application of this application.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a partial top view of a motor provided in an embodiment of the present application, showing the assembly state of the carbon brush assembly in the motor;

[0020] Figure 2 An exploded view of a carbon brush assembly provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the structure of the carbon sleeve provided in an embodiment of this application, showing the structure of the functional groove;

[0022] Figure 4 This is a schematic diagram of the structure of the movable limiting column provided in the embodiments of this application;

[0023] Figure 5 This is a schematic diagram of the structure of the limiting piece provided in the embodiments of this application;

[0024] Figure 6 This is a schematic diagram of the assembly structure of the limiting piece and the carbon sleeve in an embodiment of this application. Detailed Implementation

[0025] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0026] Those skilled in the art will understand that, unless specifically stated otherwise, the terms "described" and "the" as used herein may also include plural forms. It should be further understood that the term "comprising" as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the art. The term "and / or" as used herein refers to at least one of the items defined by the term; for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0028] refer to Figures 1-6The motor carbon brush assembly of this application is suitable for brushed motors. Typically, a brushed motor includes a stator A and a rotor B. Brushes are mounted on the stator A, and a commutator is mounted on the rotor B. The rotor B is driven to rotate through the electro-magnetic conversion of the brushes and the commutator. In this embodiment, the stator A is equipped with a mounting plate 2, and the motor carbon brush assembly of this application is fixed on the mounting plate 2 as a brush. The motor carbon brush assembly of this application includes a carbon sleeve 11 and a carbon brush 12 that are nested together. The top of the carbon brush 12 is equipped with a brush braid 13 that bends outward and extends through a designated through hole 22 in the mounting plate 2 and connects to the power connection module. The brush braid 13 is usually made of conductive metal and is rigidly connected to the carbon brush 12 to maintain good conductivity. Thus, the spatial bending structure of the brush braid 13 can be used to temporarily fix the carbon brush 12, avoiding direct impact on the surface structure of the carbon brush 12. Furthermore, the carbon sleeve 11 is provided with a functional slot, and the brush braid 13 can extend from one of the functional slots to facilitate the assembly of the carbon brush 12 with the carbon sleeve 11. The limiting member 14 is configured based on the functional slot to temporarily fix the brush braid 13, so that the carbon brush 12 is retracted into the carbon sleeve 11, making room for the assembly of the rotor B. In order to keep the front end of the carbon brush 12 in contact with the commutator, an elastic member 15 is provided between the rear part of the carbon brush 12 and the carbon sleeve 11. Optionally, the elastic member 15 is a spring.

[0029] Furthermore, the carbon sleeve 11 in this embodiment includes a top wall 111, a side wall 112 adjacent to the top wall 111, rivets 113 extending downward from the side wall 112, and a rear wall 114 positioned behind the carbon sleeve 11. The top wall 111, side wall 112, and rivets 113 can be integrally formed from sheet metal. The spacing and thickness of each rivet 113 are adapted to the preset holes on the mounting plate 2. When the rivets 113 are inserted into the preset holes, bending them can fix the carbon sleeve 11, eliminating the need for screw fixing, rivet fixing, or welding fixing.

[0030] A first functional groove 115 is formed along the longitudinal direction of the top wall 111. The first functional groove 115 extends from the middle of the top wall 111 forward and to the front edge of the top wall 111, forming a front opening. When the carbon brush 12 is inserted from the front end of the carbon sleeve 11, the first functional groove 115 also serves as a sliding channel for the proximal end 131 of the brush braid. The distal end 132 of the brush braid forms a curved structure and passes through the through hole 22 on the mounting plate 2 on one side of the carbon sleeve 11. The rear wall 114 is integrally formed with the carbon sleeve 11, maintaining a gap. The rear wall 114 is separated from both the top wall 111 and the side wall 112, forming a second functional groove 116. Furthermore, the aforementioned elastic member 15 abuts against the inner side of the rear wall 114. When a spring is used, the second functional groove 116 is not completely blocked, maintaining the existence of the gap. Furthermore, the rear wall 114 can be integrally formed with the mounting plate 2, which is beneficial for the production and processing of various parts and also allows for the pre-setting of the assembly position of the carbon brush assembly, thereby improving the assembly efficiency of the motor.

[0031] There are two ways to temporarily fix the brush braid 13: one is to fix the proximal end 131 of the brush braid 13, and the other is to fix the distal end 132 of the brush braid 13.

[0032] refer to Figure 3 and Figure 4 When the limiting member 14 is used to temporarily fix the proximal end 131 of the brush braid 13, a movable limiting post 141 is used. The movable limiting post 141 is set in the first functional groove 115 and / or on the top wall 111 near the first functional groove 115. The movable limiting post 141 includes a post body 1411, a suction cup 1412 set below the post body 1411, and an operating plate 1413 set above the post body 1411. The post body 1411 is defined by a cylindrical wall that can be folded multiple times longitudinally. The suction cup 1412 of the movable limiting post 141 is conducive to adsorption and fixation at any position in the first functional groove 115 or on the upper surface of the top wall 111, and is also easy to remove, with minimal impact on the surface of the carbon brush 12 and the carbon sleeve 11. The movable limiting post 141 can be longitudinally extended and folded. The maximum diameter of its cylindrical wall changes with the height of the post 1411. When the height of the post 1411 is reduced, the outer diameter of the cylindrical wall increases, and the vertical stacking and compression of the cylindrical wall increases the overall hardness, which meets the requirement of temporarily abutting the brush braid 13. At this time, the movable limiting post 141 can be adsorbed on the upper surface of the top wall 111 to meet the requirement of temporarily fixing the brush braid 13. When the movable limiting post 141 is adsorbed on the first functional groove 115, it can not only be fixed on the upper surface of the carbon brush 12 by the suction cup 1412, but also abut against the two sides of the first functional groove 115 by the outer surface of the cylindrical wall, which enhances the stability of the movable limiting post 141. In this embodiment, the cylindrical wall is a straight cylinder. Other possible implementations can set the cylindrical wall as a flared cylinder with a larger top and a smaller bottom. After the flared cylinder is pressed down, it can be stacked and compressed inward to thicken the overall side wall 112, thereby increasing the hardness and increasing the diameter of the outer surface of the cylindrical wall. The operating plate 1413 of the movable limiting post 141 provides a point of leverage for pressing and pulling with fingers or tools, facilitating the transfer of the movable limiting post 141. To achieve the aforementioned deformation effect, the movable limiting post 141 can be made of a soft material, such as polyethylene or polypropylene. When a single movable limiting post 141 cannot meet the requirements for temporary fixation of the brush braid 13, two or more movable limiting posts 141 can be used for multi-point fixation.

[0033] refer to Figure 1-35, 6. When the limiting member 14 is used to temporarily fix the distal end 132 of the brush braid 13, the limiting member 14 can be set in the area of ​​the second functional groove 116 and / or the top wall 111 near the second functional groove 116. It should be noted that "distal end 132" relative to "proximal end 131" does not refer to the farthest end of the brush braid 13; the range from "proximal end 131" to "distal end 132" of the brush braid 13 discussed herein is the area above the mounting plate 2. The limiting member 14 configured based on the second functional groove 116 can be in two ways: one is a non-removable hook 142, and the other is a removable limiting piece 143.

[0034] like Figure 1 and Figure 2 As shown, the limiting member 14 is a hook 142 extending upward from the rear edge of the top wall 111. The body of the hook 142 can be connected to the carbon sleeve 11 via an elastic sheet (not shown), so that the hook 142 can retract into the carbon sleeve 11 when pressed downward. One possible implementation is that the elastic sheet is elongated, with its two ends connected to the hook 142 and the inner wall (top wall 111, side wall 112, or rear wall 114) of the carbon sleeve 11, respectively, thereby forming a cantilever structure supporting the hook 142. The hook 142 can move to a limited extent and automatically reset by relying on the elastic deformation of the elastic sheet body. The hook 142 has limited movement and automatic reset, adapting to the fitting requirements between the carbon brush 12 and the carbon sleeve 11. Typically, the carbon brush 12 and the carbon sleeve 11 should fit as snugly as possible, but this should not impede the reciprocating movement of the carbon brush 12 in the longitudinal direction. Therefore, the relative movement of the carbon brush 12 and the carbon sleeve 11 in the lateral direction is limited. The brush braid 13 fixed to the top of the carbon brush 12 can have a pre-set fixed bending section 1321, for example, a pre-set section that can be abutted by the hook 142. In the bent section 1321, when the carbon brush 12 retracts into the carbon sleeve 11, the brush braid 13 moves backward synchronously. The hook 142 can create a channel for the brush braid 13 to move by pressing. After the brush braid 13 passes the top of the hook 142, the hook 142 resets to restrict the brush braid 13 from moving forward, thus forming a limiting member 14 that restricts the translation of the carbon brush 12. When the carbon brush 12 needs to be reset, the hook 142 can be pressed again to allow the brush braid 13 to move by. Furthermore, the elastic sheet should not protrude from the inner wall of the carbon sleeve 11 to avoid affecting the surface structure of the carbon brush 12.

[0035] like Figure 5 and Figure 6As shown, the limiting member 14 is a limiting piece 143 that can be inserted into the second functional slot 116. The limiting piece 143 includes at least three coplanar and concentrically arranged support petals 1431, which are connected by a gathering portion 1432, such that when any two support petals 1431 are radially pressed, the remaining support petals 1431 retract inward toward the center. Further, the gathering portion 1432 includes multiple folding units arranged in a circular pattern converging at the center, and adjacent folding units are connected in a mirror-symmetric manner; each folding unit includes three edges arranged from top to bottom relative to the illusory circular surface: an upper convex edge 1432a, a transition edge 1432b, and a lower concave edge 1432c, and also includes a connecting surface 1432d connecting each edge. In other words, when the clockwise arrangement of the three edges of the current folding unit is "convex edge 1432a - transition edge 1432b - concave edge 1432c", the clockwise arrangement of the three edges of the left and right folding units is "concave edge 1432c - transition edge 1432b - convex edge 1432a". The connecting surfaces 1432d on both sides of each edge can move around the common edge, and adjacent connecting surfaces 1432d can be bent to a limited extent. According to the folding structure of the gathering part 1432, when a centripetal pressure is applied to any radial direction, the center moves downward toward the virtual circular surface, causing all connecting surfaces 1432d to gather downward, so that the edge of the gathering part 1432 moves inward, thereby causing all support petals 1431 to retract inward.

[0036] Any support petal 1431 can be used to temporarily fix the brush braid 13 with a preset bending section 1321. Furthermore, when any two support petals 1431 are pressed radially, all support petals 1431 can be controlled to retract inward. The support petals 1431 that are controlled to retract inward include the support petals 1431 that originally performed the temporary fixing of the brush braid 13. This arrangement is beneficial to improving the control and utilization of each support petal 1431. Different models of motors have different internal structures. In some cases, there may be spatial resistance affecting the pressing operation of the hook 142, making it difficult for the brush braid 13 to detach from the hook 142. The limiting piece 143 provided in this application can at least partially overcome the defects of using the hook 142 and can perform displacement control of the current support petal 1431.

[0037] The limiting piece 143 shown in this embodiment has four petals, each petal arranged in pairs opposite each other and orthogonally. The overall thickness of the limiting piece 143 is less than the width of the second functional slot 116, so as to facilitate insertion into and removal from the second functional slot 116, or at least the portion inserted into the second functional slot 116 has a smaller thickness. The lateral and vertical dimensions of the limiting piece 143 are both larger than the carbon sleeve 11, so that after the limiting piece 143 is inserted into the second functional slot 116, at least three support petals 1431 can extend beyond the second functional slot 116. The support petals 1431 extending beyond the second functional slot 116 can all be candidate support petals 1431 for performing temporary fixation based on the setting of the bent section 1321 of the braid 13, such as vertical support petals 1431 or lateral support petals 1431. When it is necessary for the target support petal 1431 to retract, the other two support petals 1431 can be pressed simultaneously. Furthermore, to facilitate pressing operations, a designated support petal 1431 can be selected as the commonly used petal, and its edges can be thickened and widened to improve the convenience of pressing operations. On the other hand, to facilitate insertion into the second functional slot 116, one of the petals can be designated as the upright petal 1433 to support the bottom of the second functional slot 116, and the thickness of the upright petal 1433 can be configured to be less than that of the other support petals 1431, or the edges of the upright petal 1433 can not be thickened and widened, thereby making the upright petal 1433 visually distinguishable and improving the ease of use of the limiting piece 143. The upright petal 1433 and the support petals 1431 are both connected to the gathering portion 1432 and are arranged coplanarly and concentrically.

[0038] Those skilled in the art will understand that the aforementioned movable limiting post 141 can also be used to temporarily fix the distal end 132 of the brush braid 13. Where the surface structure of the carbon sleeve 11 permits, the movable limiting post 141 can be replaced with the hook 142 or the limiting piece 143. The movable limiting post 141, hook 142 and limiting piece 143 included in the limiting member 14 can be used independently or in combination without affecting the essential spirit of this application.

[0039] In summary, this application provides a motor carbon brush assembly, comprising a carbon sleeve and a carbon brush nested together. A brush braid is disposed at the top of the carbon brush. The carbon sleeve has a functional groove from which the brush braid extends. A limiting member is disposed based on the functional groove to temporarily fix the brush braid, causing the carbon brush to retract into the carbon sleeve. This motor carbon brush assembly utilizes the three-dimensional spatial structure of the bent and extended brush braid, and a limiting member is provided outside the carbon sleeve to temporarily limit the brush braid, thereby achieving temporary fixation of the carbon brush and avoiding direct contact with the carbon brush.

[0040] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in related technologies that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0041] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate directions or positional relationships based on the exemplary directions or positional relationships shown in the accompanying drawings. They are used to facilitate the description or simplification of the embodiments of this application and are not intended to indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. A motor carbon brush assembly, characterized in that, It includes a carbon sleeve and a carbon brush that are nested together. The top of the carbon brush is provided with a brush braid. The carbon sleeve is provided with a functional groove, and the brush braid extends out of the functional groove. A limiting member is provided based on the functional groove to temporarily fix the brush braid, so that the carbon brush is retracted into the carbon sleeve.

2. The motor carbon brush assembly as described in claim 1, characterized in that, The carbon sleeve includes a top wall, a side wall adjoining the top wall, a rivet extending downward from the side wall, and a rear wall blocking the rear of the carbon sleeve; the top wall has a first functional groove along its longitudinal direction, so that the brush braid extends out from the first functional groove.

3. The motor carbon brush assembly as described in claim 2, characterized in that, When the limiting member is used to temporarily fix the proximal end of the brush braid, the limiting member is disposed on the upper surface of the first functional groove and / or the top wall.

4. The motor carbon brush assembly as described in claim 3, characterized in that, The limiting component includes a movable limiting post, which includes a column body, a suction cup disposed below the column body, and an operating disc disposed above the column body. The column body is defined by a cylindrical wall that can be folded multiple times longitudinally.

5. The motor carbon brush assembly as described in claim 2, characterized in that, The rear wall maintains a gap with the top wall and the side wall respectively to form a second functional groove.

6. The motor carbon brush assembly as described in claim 5, characterized in that, When the limiting member is used to temporarily fix the distal end of the brush braid, the limiting member is disposed in the second functional groove and / or the area of ​​the top wall near the second functional groove.

7. The motor carbon brush assembly as described in claim 6, characterized in that, The limiting member includes a hook extending upward from the rear edge of the top wall, the hook being connected to the carbon sleeve via an elastic sheet, such that the hook can retract into the carbon sleeve when pressed; or, the limiting member includes a limiting piece that can be inserted into the second functional slot, the limiting piece including at least three coplanar concentric support petals, each support petal being connected via a convergence portion, such that when any two of the support petals are radially pressed, the remaining support petals retract inward toward the center, and a single support petal is used to temporarily fix the brush braid.

8. The motor carbon brush assembly as described in claim 7, characterized in that, The gathering section includes multiple folding units arranged in a circular pattern converging at the center, with adjacent folding units being mirror-symmetrical; each folding unit includes an upper convex edge, a transition edge, and a lower concave edge arranged from top to bottom relative to the circular surface, as well as a connecting surface connecting each edge, with adjacent connecting surfaces capable of moving around a common edge.

9. The motor carbon brush assembly as described in claim 7, characterized in that, The limiting piece also includes a vertical petal, which is connected to the gathering portion and is coplanar and concentrically arranged with the support petal. The thickness of the vertical petal is smaller than that of the support petal.

10. An electric motor comprising a stator and a rotor that cooperate with each other, characterized in that, The stator employs the motor carbon brush assembly as described in any one of claims 1 to 9.

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