Mounting structure of motor carbon brush

Abstract

The utility model provides a mounting structure of a motor carbon brush, and belongs to the technical field of motors. The problem that an existing motor carbon brush is low in assembling efficiency is solved. The mounting structure of the motor carbon brush comprises a base with a center hole, a plurality of carbon brush boxes arranged around the center hole at intervals, carbon brush bodies movably arranged in the carbon brush boxes and elastic pieces used for pushing the carbon brush bodies outwards, and the carbon brush bodies are connected with brush braids made of metal wires. The side wall of the carbon brush box is provided with an avoiding groove used for avoiding a brush braid along the length direction, and the side wall of the carbon brush box is also provided with a fixed convex part which protrudes outwards and is used for hanging or winding the brush braid. The carbon brush box is simple in structure, ingenious in design, low in cost, easy to operate, low in operation requirement for assembling personnel and high in assembling efficiency, the outwards-protruding fixing protruding part is arranged on the carbon brush box, and the original carbon braid of the carbon brush is matched with the fixing protruding part to limit the carbon brush.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology and relates to a fastener, particularly a motor carbon brush mounting structure. Background Technology

[0002] An electric motor is a commonly used power output device that converts electrical energy into mechanical energy. It mainly consists of a rotor and a stator. By energizing the coils on the stator, a rotating magnetic field is generated, which acts on the rotor to form a magnetoelectric torque.

[0003] To ensure a continuous supply of electrical power to the rotating rotor, carbon brushes are typically used in conjunction with the commutator on the rotor to form a stable current path. To maintain stable contact between the carbon brushes and the commutator, springs are used to push the carbon brushes back, keeping them in contact with the commutator. Since motor installation usually involves installing the carbon brushes first and then the rotor, after installation, the carbon brushes tend to move forward under the action of the springs, interfering with the rotor installation. Therefore, when installing the rotor, the carbon brushes need to be manually pressed back, which requires skilled installation and results in low installation efficiency.

[0004] To address the aforementioned issues, Chinese patent application (application number: 202420140623.8) discloses a carbon brush auxiliary installation tool. This tool features a strip-shaped hole at the carbon brush outlet and uses an inserted strip plate to limit the carbon brush's position. After the rotor is installed, the strip plate is removed to complete the assembly. However, during operation, the operator must align the strip plate with the relatively narrow hole, making insertion laborious and inefficient. Furthermore, the small size of the strip plate makes it easy to lose during operation, causing inconvenience. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing an installation structure for motor carbon brushes. The technical problem to be solved by this utility model is: how to make the installation of carbon brushes simpler.

[0006] The purpose of this utility model can be achieved through the following technical solution: an installation structure for a motor carbon brush, comprising a base with a central hole, a plurality of carbon brush boxes spaced around the central hole, a carbon brush body movably disposed within the carbon brush boxes, and an elastic member for pushing the carbon brush body outward, wherein the carbon brush body is connected to a brush braid made of metal wire, characterized in that a clearance groove for avoiding the brush braid is opened along the length direction on the side wall of the carbon brush box, and a fixing protrusion protruding outward for the brush braid to be hooked or wrapped around is also provided on the side wall of the carbon brush box.

[0007] During installation, the carbon brush body and the elastic element are inserted into the carbon brush box together. The brush braid connected to the carbon brush body is then passed through the clearance groove and hooked or wrapped around the fixing protrusion. The brush braid is made of metal wire and has a certain rigidity. It can hook or wrap around the fixing protrusion and apply a pulling force to the carbon brush body in the opposite direction to the elastic element, thereby confining the carbon brush body within the carbon brush box and preventing the carbon brush body from interfering with the center hole of the base. After the rotor is installed, the brush braid is separated from the positioning protrusion, which releases the restriction on the carbon brush body. Under the action of the elastic element, the carbon brush body moves towards the center hole and contacts and abuts against the commutator on the rotor. The operation is simple and convenient, more efficient, and requires no additional tools.

[0008] In the above-mentioned motor carbon brush installation structure, the fixing protrusion and the relief groove are located on the same side of the carbon brush box, so that the distance between the brush braid and the fixing protrusion is closer after the brush braid extends out of the relief groove, which makes it easier for the brush braid to be hooked and wrapped.

[0009] In the above-described motor carbon brush mounting structure, the fixing protrusion is located at the end of the clearance groove. This ensures that the direction of the tension generated when the brush braid is hooked or wrapped around the fixing protrusion is essentially on the same straight line as the direction of the tension applied by the elastic element, resulting in better positioning of the carbon brush.

[0010] In the above-mentioned motor carbon brush box installation structure, the front end of the relief groove is flared, which facilitates the embedding of the brush braid into the relief groove during carbon brush installation, thereby improving the carbon brush installation efficiency.

[0011] In the aforementioned motor brush box mounting structure, the fixing protrusion is formed by folding down the side wall of the brush box. This simplifies the molding process of the fixing protrusion and reduces costs.

[0012] In the aforementioned motor brush holder mounting structure, the upper end of the fixing protrusion also has a flange that bends away from the opening of the brush holder. The flange makes the fixing protrusion hook-shaped, preventing the brush braid from getting caught on or wrapped around the fixing protrusion and then loosening from above the fixing protrusion, thus providing a more stable and reliable positioning of the brush.

[0013] In the aforementioned motor carbon brush box mounting structure, both sides of the fixing protrusion have inwardly recessed wire-holding grooves. Similarly, after the brush braid is hooked or wrapped around the fixing protrusion, the brush braid is embedded in the wire-holding grooves, preventing it from loosening from the fixing protrusion.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] This utility model has a simple structure and ingenious design. It features an outwardly protruding fixing protrusion on the carbon brush box, and utilizes the original carbon braid of the carbon brush to cooperate with the fixing protrusion to limit the carbon brush. The modification is minimal, avoiding any impact on the original structure of the motor. It is more versatile, lower in cost, and the operation of limiting and unlocking the carbon brush is simple and quick, requiring less technical expertise from the operator, and can significantly improve the assembly efficiency of the motor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the carbon brush box and the carbon brush in conjunction;

[0018] Figure 3 This is a schematic diagram of the carbon brush structure;

[0019] Figure 4 This is a schematic diagram of the carbon brush box structure;

[0020] Figure 5 This is a schematic diagram of the structure of the carbon brush box and carbon brush in Embodiment 2;

[0021] Figure 6 This is a schematic diagram of the carbon brush box in Example 3.

[0022] In the diagram, 11 is the base; 11a is the center hole; 12 is the mounting plate; 2 is the carbon brush box; 2a is the sliding groove; 2b is the clearance groove; 21 is the fixing protrusion; 22 is the flange; 21a is the wire retaining groove; 3 is the carbon brush; 31 is the carbon brush body; 32 is the elastic element; and 33 is the brush braid. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] Example 1

[0025] A mounting structure for motor carbon brushes, such as Figure 1 As shown, the device includes a base 11, a brush holder 2, and a carbon brush 3. The base 11 is disc-shaped and has a central hole 11a for the rotor and the commutator on the rotor to be inserted. A mounting plate 12 is fixed on the base 11. The brush holder 2 is fixed on the mounting plate 12 and arranged around the central hole 11a. The number of brush holders 2 can be set according to different motors. In this embodiment, there are two brush holders 2, which are symmetrically distributed on both sides of the central hole 11a. The carbon brush 3 is movably disposed in the groove 2a with its front end facing the central hole 11a.

[0026] Specifically, such as Figures 2-4As shown, the carbon brush holder 2 is rectangular and has a groove 2a that runs along the length of the carbon brush holder 2 and is open at one end. A clearance groove 2b, communicating with the groove 2a, is formed along the length of one side wall of the carbon brush holder 2. The clearance groove 2b has an opening at its front end. A fixing protrusion 21 protrudes outward from the side wall of the carbon brush holder 2. The fixing protrusion 21 and the clearance groove 2b are located on the same side of the carbon brush holder 2 and at the tail end of the clearance groove 2b. The carbon brush 3 includes a carbon brush body 31, an elastic element 32, and a brush braid 33. The carbon brush body 31 is made of graphite and is a long rectangular strip that matches the shape of the groove 2a. In this embodiment, the elastic element 32 is a spring, located at the tail end of the carbon brush body 31 and fixedly connected to it. The brush braid 33 is made of metal wire and connected to the rear side of the carbon brush body 31.

[0027] During assembly, the elastic element 32 and the carbon brush body 31 are sequentially placed into the sliding groove 2a of the carbon brush box 2, and the brush braid 33 is embedded into the relief groove 2b, so that the brush braid 33 is located on the outside of the carbon brush box 2. Then, the front end of the carbon brush body 31 is squeezed along the length direction, so that the elastic element 32 is in a compressed state. Then, the brush braid 33 is hung or wrapped around the fixed protrusion 21, so that the brush braid 33 is in a taut state and applies tension to the carbon brush body 31, thus restricting the carbon brush body 31 within the carbon brush box 2. After the rotor is installed in place, the brush braid 33 is removed from the fixed protrusion 21, so that the carbon brush body 31 abuts against the commutator on the rotor under the action of the elastic element 32.

[0028] Furthermore, in order to facilitate the insertion of the brush braid 33 into the relief groove 2b, the front end of the relief groove 2b is flared.

[0029] Furthermore, in this embodiment, the carbon brush box 2 is formed by stamping and folding an iron sheet, and the fixing protrusion 21 is formed by folding the side wall of the carbon brush box 2.

[0030] Example 2

[0031] like Figure 5 As shown, the technical solution of this embodiment is basically the same as that of Embodiment 1. The difference is that in this embodiment, the upper end of the fixing protrusion 21 also has a flange 22. The flange 22 is bent away from the opening of the carbon brush box 2 and transitions in an arc shape, so that the upper part of the fixing protrusion 21 is in the shape of an arc hook, so as to prevent the brush braid 33 from coming loose from the top of the fixing protrusion 21.

[0032] Example 3

[0033] like Figure 6As shown, the technical solution of this embodiment is basically the same as that of Embodiment 1. The difference is that in this embodiment, both sides of the fixed protrusion 21 have inwardly recessed wire-locking grooves 21a, so that when the brush braid 33 is attached to or wrapped around the fixed protrusion 21, the brush braid 33 can be embedded in the wire-locking grooves 21a, thereby improving the stability of the fit between the brush braid 33 and the fixed protrusion 21 and preventing the brush braid 33 from loosening.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as base 11, brush holder 2, carbon brush 3, brush body 31, and brush braid 33, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A mounting structure for a motor carbon brush, comprising a base (11) having a central hole (11a), a plurality of carbon brush holders (2) spaced around the central hole (11a), a carbon brush body (31) movably disposed within the carbon brush holders (2), and an elastic member (32) for pushing the carbon brush body (31) outward, wherein the carbon brush body (31) is connected to a brush braid (33) made of metal wire, characterized in that, The carbon brush box (2) has a clearance groove (2b) along its length on its side wall to avoid the brush braid (33), and the carbon brush box (2) also has a fixing protrusion (21) that protrudes outward and allows the brush braid (33) to be hooked or wrapped.

2. The motor carbon brush mounting structure according to claim 1, characterized in that, The fixing protrusion (21) and the relief groove (2b) are located on the same side of the carbon brush box (2).

3. The motor carbon brush mounting structure according to claim 1 or 2, characterized in that, The fixing protrusion (21) is located at the tail of the relief groove (2b).

4. The mounting structure of the motor carbon brush (3) according to claim 3, characterized in that, The front end of the relief groove (2b) is flared.

5. The motor carbon brush mounting structure according to claim 3, characterized in that, The fixed protrusion (21) is formed by folding the side wall of the carbon brush box (2).

6. The mounting structure for motor carbon brushes according to claim 1 or 2, characterized in that, The upper end of the fixed protrusion (21) also has a flange (22) that bends away from the opening of the carbon brush box (2).

7. The mounting structure for motor carbon brushes according to claim 1 or 2, characterized in that, Both sides of the fixed protrusion (21) have inwardly recessed wire-holding grooves (21a).

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