Electric motor brush holder

Abstract

The application provides a motor brush holder, relates to the technical field of motors, and aims to optimize the structure of the motor brush holder and improve the installation stability and efficiency between the carbon brush and the brush holder. The motor brush holder comprises a brush holder box, a carbon brush, an elastic piece and a positioning piece. The brush holder box is provided with an accommodating portion. The two ends of the accommodating portion are respectively provided with a first opening and a second opening. The carbon brush and the elastic piece are arranged in the accommodating portion. One end of the elastic piece is in abutment with the carbon brush, and the other end of the carbon brush extends out of the first opening. The accommodating portion is provided with a hollow portion corresponding to the position of the second opening. The brush holder box is provided with a limiting portion. One end of the positioning piece is in clamping connection with the hollow portion, and the other end is in clamping connection with the limiting portion. The positioning piece is blocked in the second opening, and the other end of the elastic piece is in abutment with the positioning piece.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor brush holder. Background Technology

[0002] Brushed motors, as a classic type of motor, are widely used in industrial equipment, household appliances, and transportation. The brush holder, as the core component of a brushed motor, mainly consists of brush grips, a spring system, and a fixing mechanism. Its design and manufacturing quality directly affects the motor's commutation performance, operating efficiency, and service life.

[0003] In traditional brushed motor structures, the brush holder requires precise machining and assembly to ensure constant pressure and stable contact area between the brushes and the commutator. Common brush holder structures include box-type brush holders, lever-type brush holders, and radial brush holders. These structures all require fasteners such as bolts, snap rings, or rivets to secure the brushes in their working positions. When the brushes wear down to their limit and need replacement, maintenance personnel must remove the relevant fasteners, remove the old brushes, install the new brushes, and then readjust the relative positions of the brushes and the commutator.

[0004] In practice, due to the limited internal space and numerous parts of the brush holder, this replacement process is not only time-consuming and labor-intensive, but also prone to decreased positioning accuracy due to repeated disassembly and reassembly. Especially in high-speed motors or precision instrument applications, even slight positional deviations between the brush and the commutator can cause problems such as increased sparking, increased contact resistance, or even commutation failure.

[0005] Therefore, there is an urgent need to provide a motor brush holder to address the problems existing in the prior art to some extent. Utility Model Content

[0006] The purpose of this utility model is to provide a motor brush holder, which can optimize the structure of the motor brush holder to a certain extent and improve the installation stability and efficiency between the carbon brush and the brush holder.

[0007] This utility model provides a motor brush holder, including a brush holder box, a carbon brush, an elastic element, and a positioning element. The brush holder box has a receiving portion, and a first opening and a second opening are formed at both ends of the receiving portion. The carbon brush and the elastic element are both disposed in the receiving portion. One end of the elastic element abuts against the carbon brush, so that the other end of the carbon brush extends out of the first opening. A hollow portion is formed in the receiving portion corresponding to the position of the second opening. A limiting portion is formed on the brush holder box. One end of the positioning element is engaged with the hollow portion, and the other end is engaged with the limiting portion, so that the positioning element is blocked in the second opening, and the other end of the elastic element abuts against the positioning element.

[0008] The hollow portion is formed on the top wall of the receiving portion, and a limiting beam is formed between the hollow portion and the edge of the top wall corresponding to the second opening. The positioning member includes a first mating portion, which is engaged with the limiting beam to limit the position of the positioning member in the length direction of the receiving portion.

[0009] Specifically, the positioning component includes a main body section, a transition section, and a first bending section. The transition section is perpendicular to the main body section, and one end of the transition section is connected to the main body section. The first bending section is perpendicular to the transition section, and the first bending section bends towards the brush holder box, making the first mating part U-shaped.

[0010] Furthermore, the positioning member also includes a second bent section, which is formed at one end of the first bent section and is perpendicular to the first bent section. The second bent section bends toward the main body section, and the end of the second bent section is spaced apart from the main body section.

[0011] Furthermore, a first positioning groove is formed in the middle of the main body segment, and one end of the elastic member is embedded in the first positioning groove.

[0012] Furthermore, a first positioning post is formed in the first positioning groove, and one end of the elastic member is embedded in the first positioning groove and sleeved on the first positioning post.

[0013] The main body segment has a third bending segment at the end away from the transition segment, the limiting part is a limiting groove, the third bending segment is embedded in the limiting groove, and the length of the limiting groove is greater than the size of the third bending segment; the width of the hollow part is not less than the width of the second bending segment.

[0014] Specifically, a second positioning groove is formed at one end of the carbon brush located in the receiving part, and a second positioning post is formed in the second positioning groove. The second positioning groove is set corresponding to the first positioning groove, and the second positioning post is set corresponding to the first positioning post. The end of the elastic member away from the positioning member is embedded in the second positioning groove and sleeved on the second positioning post.

[0015] Furthermore, a limiting hole is formed on the carbon brush, and a limiting post is provided in the limiting hole. The limiting post protrudes from the carbon brush. A guide portion extending along the length direction of the receiving portion is formed on the top wall of the receiving portion. A portion of the limiting post is located in the guide portion and can slide relative to the guide portion.

[0016] Furthermore, the motor brush holder provided in this application also includes a bearing and a bearing retainer ring. A bearing groove is formed at the center of the brush holder box, the bearing is embedded in the bearing groove, and the bearing retainer ring is used to restrict the bearing in the bearing groove. There are two receiving portions, which are arranged opposite to each other along the radial direction of the bearing groove.

[0017] Compared with the prior art, the motor brush holder provided by this utility model has the following advantages: The motor brush holder provided by this utility model includes a brush holder box, a carbon brush, an elastic element, and a positioning element. The brush holder box has a receiving portion, and a first opening and a second opening are formed at both ends of the receiving portion. The carbon brush and the elastic element are both disposed in the receiving portion. One end of the elastic element abuts against the carbon brush, so that the other end of the carbon brush extends out of the first opening. A hollow portion is formed in the receiving portion corresponding to the position of the second opening. A limiting portion is formed on the brush holder box. One end of the positioning element is engaged with the hollow portion, and the other end is engaged with the limiting portion, so that the positioning element blocks the second opening, and the other end of the elastic element abuts against the positioning element.

[0018] Analysis reveals that the motor brush holder provided by this invention comprises four core components: a brush holder box, carbon brushes, elastic elements, and positioning elements. The brush holder box, serving as the main support structure, can be injection molded from high-strength engineering plastic to form a specially designed receiving section. This receiving section has a rectangular channel structure with a first opening and a second opening at each end. The first opening faces the motor commutator, and the second opening is located at the opposite end. The carbon brushes and elastic elements are arranged sequentially inside the receiving section. The carbon brushes are made of high-purity graphite material, and their working surfaces undergo special grinding treatment to ensure good contact with the commutator.

[0019] The elastic element is preferably a helical spring with a certain pre-compression. One end of the spring is in close contact with the tail plane of the carbon brush. The elastic force continuously pushes the carbon brush to move towards the first opening, so that the working end of the carbon brush is stably extended out of the first opening and maintains constant pressure contact with the commutator.

[0020] The receiving section features an innovative hollow structure corresponding to the second opening, penetrating the wall thickness of the receiving section to form a specific geometric shape. A limiting part is also formed on the brush holder box. Therefore, during installation, one end of the positioning element is first engaged with the hollow part, and then the other end is engaged with the limiting part to seal the second opening. At this point, the other end of the elastic element abuts against the inner surface of the positioning element, forming a complete force transmission chain. This structural design effectively solves the problems of unstable carbon brush pressure and easy shaking in traditional brush holders. Through the multi-point engagement between the positioning element and the brush holder box, the stability of the entire carbon brush assembly during motor operation is ensured.

[0021] In actual operation, when the carbon brushes shorten due to wear, the elastic element automatically compensates for this wear by continuously pushing the carbon brushes towards the commutator, maintaining constant contact pressure. This automatic compensation mechanism significantly extends the service life of the brush assembly and reduces maintenance frequency. Simultaneously, the snap-fit ​​connection between the positioning element and the brush holder greatly simplifies the installation and replacement process, offering faster installation efficiency compared to traditional screw fixing methods. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A first-view structural schematic diagram of the motor brush holder provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of the brush holder box in the motor brush holder provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram showing the positional relationship between the positioning component, the elastic component, and the carbon brush in the motor brush holder provided in an embodiment of this utility model.

[0024] In the diagram: 1-Brush holder box; 101-Accommodation part; 1011-Hollowed part; 1012-Limiting beam; 1013-Second opening; 1014-Guide part; 102-Limiting part; 103-Bearing groove; 2-Elastic element; 3-Carbon brush; 301-Limiting hole; 4-Positioning element; 401-Main body section; 402-Transition section; 403-First bending section; 404-Second bending section; 405-Third bending section; 406-First positioning groove; 4061-First positioning post. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element 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 the utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0030] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device during use or operation.

[0031] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0032] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0033] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have various constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis that they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0034] like Figures 1-3 As shown, this utility model provides a motor brush holder, including a brush holder box 1, a carbon brush 3, an elastic member 2, and a positioning member 4. The brush holder box 1 has a receiving portion 101, and a first opening and a second opening 1013 are formed at both ends of the receiving portion 101. The carbon brush 3 and the elastic member 2 are both disposed in the receiving portion 101. One end of the elastic member 2 abuts against the carbon brush 3, so that the other end of the carbon brush 3 extends out of the first opening. A hollow portion 1011 is formed in the receiving portion 101 corresponding to the position of the second opening 1013. A limiting portion 102 is formed on the brush holder box 1. One end of the positioning member 4 is engaged with the hollow portion 1011, and the other end is engaged with the limiting portion 102, so that the positioning member 4 is blocked in the second opening 1013, and the other end of the elastic member 2 abuts against the positioning member 4.

[0035] Compared with the prior art, the motor brush holder provided by this utility model has the following advantages: The motor brush holder provided by this utility model includes four core components: a brush holder box 1, carbon brushes 3, elastic elements 2, and positioning elements 4. The brush holder box 1, serving as the main support structure, can be injection molded from high-strength engineering plastic to form a specially designed receiving portion 101. This receiving portion 101 has a rectangular channel structure with a first opening and a second opening 1013 at each end. The first opening faces the motor commutator, and the second opening 1013 is located at the opposite end. The carbon brushes 3 and elastic elements 2 are arranged sequentially inside the receiving portion 101. The carbon brushes 3 are made of high-purity graphite material, and their working surfaces undergo special grinding treatment to ensure good contact with the commutator.

[0036] The elastic element 2 is preferably a helical spring with a certain pre-compression. One end of the spring is in close contact with the tail plane of the carbon brush 3. The elastic force continuously pushes the carbon brush 3 to move towards the first opening, so that the working end of the carbon brush 3 is stably extended out of the first opening and maintains constant pressure contact with the commutator.

[0037] The receiving part 101 features an innovative hollow section 1011 structure corresponding to the second opening 1013. This hollow section 1011 penetrates the wall thickness of the receiving part 101, forming a specific geometric shape. A limiting part 102 is also formed on the brush holder box 1. Therefore, during installation, one end of the positioning member 4 is first engaged with the hollow section 1011, and then the other end is engaged with the limiting part 102 to seal the second opening 1013. At this time, the other end of the elastic member 2 abuts against the inner surface of the positioning member 4, forming a complete force transmission chain. This structural design effectively solves the problem of unstable carbon brush 3 pressure and easy shaking in traditional brush holders. Through the multi-point engagement between the positioning member 4 and the brush holder box 1, the stability of the entire carbon brush 3 assembly during motor operation is ensured.

[0038] In actual operation, when the carbon brush 3 decreases in length due to wear, the elastic element 2 automatically compensates for this wear by continuously pushing the carbon brush 3 towards the commutator, maintaining a constant contact pressure. This automatic compensation mechanism significantly extends the service life of the brush assembly and reduces maintenance frequency. Meanwhile, the snap-fit ​​connection between the positioning element 4 and the brush holder box 1 greatly simplifies the installation and replacement process, offering faster installation efficiency compared to traditional screw fixing methods.

[0039] Optionally, such as Figures 1-3 As shown, the hollow portion 1011 in this application is formed on the top wall of the receiving portion 101. The hollow portion 1011 and the edge of the second opening 1013 on the top wall are spaced apart to form a limiting beam 1012. The positioning member 4 includes a first mating portion, which is engaged with the limiting beam 1012 to limit the position of the positioning member 4 in the length direction of the receiving portion 101.

[0040] In a preferred embodiment of this application, the cutout portion 1011 is precisely formed at the top wall position of the receiving portion 101, and the top wall is based on... Figure 1 The definition is based on the perspective presented in the text and is not an absolute top wall.

[0041] The hollowed-out portion 1011 maintains a certain distance from the edge of the corresponding second opening 1013 on the top wall, thus naturally forming the limiting beam 1012 structure. The limiting beam 1012, as part of the brush holder box 1 body, has the same material strength and wear resistance as the main body. The positioning member 4 is specially designed with a first mating part, which forms a precise interlocking relationship with the limiting beam 1012. This mating relationship effectively limits the displacement of the positioning member 4 along the length of the receiving portion 101, ensuring the stability of the positioning member 4 under motor vibration conditions.

[0042] In some preferred embodiments, the cross-sectional shape of the limiting beam 1012 can be trapezoidal, narrower at the top and wider at the bottom. This design not only improves the structural strength of the limiting beam 1012 but also facilitates the installation and disassembly of the positioning component 4. The first mating part needs to be designed to correspond to the cross-sectional shape of the limiting beam 1012. Therefore, in this method, the internal snap-fit ​​space formed by the first mating part is designed as a groove structure complementary to the shape of the limiting beam 1012. During installation, simply align the first mating part with the limiting beam 1012 and press it down to engage the two components, thus ensuring the stability of the snap-fit ​​to a certain extent.

[0043] The engagement of the limiting beam 1012 with the first mating part solves the problem of axial movement of the positioning component 4 in traditional brush holders. During high-speed motor operation, the carbon brush 3 assembly is subjected to vibrations and impacts from various directions. Without effective axial restraint, the positioning component 4 may gradually loosen, leading to unstable carbon brush 3 pressure and affecting motor performance. This design, through the precise engagement of the limiting beam 1012 with the first mating part, firmly locks the positioning component 4 in the predetermined position, ensuring the long-term stability of carbon brush 3 pressure. Furthermore, the snap-fit ​​connection eliminates the need for any tools during installation, allowing for manual operation. On large-scale production lines, this design saves significant time and reduces production costs. Simultaneously, the limiting beam 1012, as part of the brush holder box 1, requires no additional parts, simplifying the mold structure and improving product consistency.

[0044] Optionally, such as Figures 1-3 As shown, the positioning component 4 includes a main body section 401, a transition section 402 and a first bending section 403. The transition section 402 is perpendicular to the main body section 401, and one end of the transition section 402 is connected to the main body section 401. The first bending section 403 is perpendicular to the transition section 402, and the first bending section 403 bends towards the brush holder box 1, so that the first mating part is U-shaped.

[0045] The structure of the positioning component 4 has been carefully optimized, comprising three main parts: the main body section 401, the transition section 402, and the first bending section 403. The main body section 401 is a flat plate structure, undertaking the main functions of supporting the elastic component 2 and transmitting pressure. The transition section 402 is perpendicularly connected to the main body section 401, and the first bending section 403 is also perpendicular to the transition section 402, bending towards the brush holder box 1, so that the first mating part presents an overall U-shaped structure.

[0046] This U-shaped structure provides a certain degree of elastic deformation space, allowing for appropriate deformation during installation to ensure an interference fit with the limiting beam 1012 and enhance the reliability of the connection. Secondly, the top surface of the transition section 402 facilitates the application of force by operators during installation.

[0047] When the positioning component 4 is installed into the brush holder box 1, the first bent section 403 of the U-shaped structure will first contact the limiting beam 1012. As pressure continues to be applied, the U-shaped structure undergoes elastic deformation, and the bent section expands to a certain extent until it completely passes over the limiting beam 1012 to form a firm fastening. During disassembly, simply pry the transition section 402 with a tool to allow the bent section to expand again, thus removing the positioning component 4. With this structural form, no special tools are required; disassembly can be achieved simply by prying the rigid structure of the transition section 402. Furthermore, the disassembly process only requires this one prying action, greatly reducing the difficulty of assembly and disassembly.

[0048] Optionally, such as Figures 1-3 As shown, the positioning member 4 in this application also includes a second bent section 404, which is formed at one end of the first bent section 403 and is perpendicular to the first bent section 403. The second bent section 404 bends toward the main body section 401 and the end of the second bent section 404 is spaced apart from the main body section 401.

[0049] In this embodiment, the positioning member 4 is further enhanced with a second bending segment 404. The second bending segment 404 is formed at one end of the first bending segment 403, is perpendicular to the first bending segment 403, and bends towards the main body segment 401. Its end is appropriately spaced from the main body segment 401, forming a hook-like structure.

[0050] The design of the second bending section 404 enhances the connection reliability between the positioning component 4 and the brush holder box 1. When the positioning component 4 is installed in place, the second bending section 404 is positioned precisely below the limiting beam 1012, forming a clamping effect with the first bending section 403, together firmly securing the limiting beam 1012 within it. This double-safety mechanism effectively prevents the positioning component 4 from accidentally dislodging under strong vibration conditions, making it particularly suitable for applications with extremely high reliability requirements, such as automobiles.

[0051] Furthermore, this method, to a certain extent, solves the technical problem of the positioning component 4 being prone to loosening and falling off under high-frequency vibration environment.

[0052] In this application, the end face of the second bending segment 404 is spaced from the main body segment 401, and this space is not less than the width of the limiting beam 1012. Therefore, during actual installation, the positioning member 4 is first installed from top to bottom, so that the limiting beam 1012 passes through the gap between the second bending segment 404 and the main body segment 401 and comes into contact with the transition segment 402. Then, under the action of the elastic force of the elastic member 2, the positioning member 4 will move relative to the limiting beam 1012, so that the limiting beam 1012 moves into the space formed by the transition segment 402, the first bending segment 403 and the second bending segment 404, thereby realizing the snap-fit ​​between the positioning member 4 and the limiting beam 1012. Under the action of the elastic member 2, the limiting beam 1012 will always remain in this space, thereby ensuring the connection stability of the positioning member 4.

[0053] Optionally, such as Figures 1-3 As shown, a first positioning groove 406 is formed in the middle of the main body segment 401 in this application, and one end of the elastic member 2 is embedded in the first positioning groove 406.

[0054] A first positioning groove 406 is specially designed in the middle of the main body section 401 of the positioning component 4. This groove is precision-machined, and its shape and size perfectly match the end of the elastic component 2. The first positioning groove 406 is a circular recess structure with a depth precisely calculated to accommodate the end of the elastic component 2 without being too deep and affecting the structural strength. The bottom of the groove adopts a flat design to ensure full contact with the end face of the elastic component 2 and avoid stress concentration.

[0055] The main function of the first positioning groove 406 is to precisely fix the position of the elastic element 2, preventing it from shifting or tilting during operation. In traditional designs, the elastic element 2 rests directly against the flat plate, which is prone to slippage due to vibration, resulting in uneven force on the carbon brush 3 and accelerating local wear. This design, through the constraint of the first positioning groove 406, keeps the elastic element 2 in the correct position at all times, ensuring the linearity and stability of pressure transmission.

[0056] When the elastic element 2 is installed into the receiving part 101, its end naturally embeds into the first positioning groove 406, forming a tight fit. This fit has a self-centering characteristic; even with minor installation errors, the elastic element 2 can automatically adjust to the optimal position under pressure. When the carbon brush 3 wears out and needs to be replaced, simply remove the positioning element 4, and the elastic element 2 will be removed along with it, without scattering inside the receiving part 101, greatly facilitating maintenance.

[0057] The first positioning groove 406 is formed at the center of the positioning element 4, which can, to a certain extent, avoid the technical problem of uneven wear of the carbon brush 3 caused by inaccurate positioning of the elastic element 2. In practical applications, uniform wear of the carbon brush 3 is crucial to motor performance. If the force line applied by the elastic element 2 does not pass through the center of the carbon brush 3, it will cause the carbon brush 3 to wear at an angle, reducing the effective contact area, increasing contact resistance, and affecting motor efficiency. This design, through the precise positioning function of the first positioning groove 406, ensures that the force is always along the axial direction of the carbon brush 3, causing uniform wear on the working surface of the carbon brush 3 and extending its service life.

[0058] Furthermore, the design of the first positioning groove 406 also improves installation convenience. During assembly, operators only need to place the end of the elastic element 2 into the groove, without the need for additional fixing measures, simplifying the process. In mass production, this design can significantly improve assembly efficiency and reduce labor costs. At the same time, because the position of the elastic element 2 is reliably fixed, rework and scrap rates caused by improper installation are reduced, improving product quality consistency.

[0059] Optionally, such as Figures 1-3 As shown, a first positioning post 4061 is formed in the first positioning groove 406 of this application, and one end of the elastic member 2 is embedded in the first positioning groove 406 and sleeved on the first positioning post 4061.

[0060] A first positioning post 4061 is further provided within the first positioning groove 406, and the positioning post is integrally formed with the bottom of the groove, with a height greater than the groove depth and a diameter matching the inner diameter of the elastic element 2. The first positioning post 4061 adopts a cylindrical design with a guide cone at the top to facilitate the installation of the elastic element 2. The surface of the positioning post is smooth and burr-free to ensure that the inner surface of the elastic element 2 is not damaged.

[0061] The first positioning pin 4061 and the first positioning groove 406 together form a dual positioning system, constraining the elastic element 2 in both radial and axial directions. During installation, the end of the elastic element 2 is embedded in the first positioning groove 406, while its inner hole is fitted onto the first positioning pin 4061, forming a tight fit. This design completely eliminates any possible displacement of the elastic element 2 during operation, including radial wobble and axial rotation, ensuring the accuracy and stability of pressure transmission.

[0062] When the motor is running, the carbon brush 3 is subjected to unbalanced forces from the commutator, which are transmitted to the positioning element 4 through the elastic element 2. Without effective radial restraint, the elastic element 2 may experience slight vibrations, which can accelerate fatigue damage of components and generate noise. The presence of the first positioning post 4061 effectively suppresses this harmful vibration and improves the dynamic stability of the assembly.

[0063] Optionally, such as Figures 1-3As shown, the main body segment 401 in this application has a third bent segment 405 formed at the end away from the transition segment 402. The limiting part 102 is a limiting groove, and the third bent segment 405 is embedded in the limiting groove. The length of the limiting groove is greater than the size of the third bent segment 405. The width of the hollow part 1011 is not less than the width of the second bent segment 404.

[0064] The positioning element 4 forms a third bent section 405 at the end of the main body section 401 away from the transition section 402, and this bent section is perpendicular to the main body section 401. Correspondingly, a limiting groove is provided on the brush holder box 1, which matches the shape of the third bent section 405, but is slightly longer, providing a certain fitting clearance. The width of the hollowed-out portion 1011 has also been precisely calculated to ensure that it is not less than the width of the second bent section 404, providing the necessary operating space for installation and disassembly.

[0065] The third bending section 405, in conjunction with the limiting groove, forms the second fixing point of the positioning component 4, together with the first mating part, forming a two-point fixing system. This design significantly improves the torsional resistance and overall stability of the positioning component 4. When the motor is subjected to impact or vibration, the two fixing points share the load, avoiding the stress concentration problem that may occur with single-point fixing.

[0066] The length of the limiting groove is slightly larger than the size of the third bending section 405, which ensures both ease of installation and provides compensation space for thermal expansion.

[0067] During actual assembly, when the limiting beam 1012 is inserted into the space formed by the transition section 402, the first bending section 403, and the second bending section 404, it will be pushed by the elastic member 2 to move away from the carbon brush 3. Therefore, the formed limiting groove can provide a guide for the movement of the positioning member 4. Furthermore, after the limiting beam 1012 is fully inserted into the formed space, the third bending section 405 can abut against the inner wall of the end of the limiting groove, thereby achieving overall limiting of the positioning member 4.

[0068] When disassembly is required, simply push the positioning component 4 to disengage the limiting beam 1012 from the space, and then lift the positioning component 4 upwards to separate the positioning component 4 from the brush holder box 1. No tools are needed for disassembly and assembly, which greatly improves the efficiency of disassembly and assembly and reduces the difficulty of maintenance.

[0069] Optionally, such as Figures 1-3 As shown, the carbon brush 3 in this application has a second positioning groove formed at one end inside the receiving part 101. A second positioning post is formed in the second positioning groove. The second positioning groove is set corresponding to the first positioning groove 406, and the second positioning post is set corresponding to the first positioning post 4061. The end of the elastic member 2 away from the positioning member 4 is embedded in the second positioning groove and sleeved on the second positioning post.

[0070] The carbon brush 3 has a second positioning groove machined at one end within the receiving part 101, and a second positioning post is provided within the groove. These structures correspond to the first positioning groove 406 and the first positioning post 4061 on the positioning member 4, forming a complete positioning system. The depth and diameter of the second positioning groove are precisely calculated to form an ideal fit with the end of the elastic member 2. The height of the second positioning post is moderate, and the top has a guide slope for easy installation.

[0071] The design of the second positioning groove and the second positioning post ensures a precise fit between the elastic element 2 and the carbon brush 3. After assembly, both ends of the elastic element 2 are respectively fitted onto the first positioning post 4061 and the second positioning post, and simultaneously embedded in the corresponding positioning grooves, forming a complete force transmission chain. This design allows the elastic element 2 to maintain the correct posture throughout the entire working process, avoiding localized stress concentration caused by misalignment.

[0072] The positioning of the carbon brush 3 end and the positioning of the positioning element 4 end work together to ensure that the force applied by the elastic element 2 always passes through the axial direction of the carbon brush 3. This centering design ensures that the working surface of the carbon brush 3 is evenly stressed, avoiding uneven wear and improving commutation quality and service life. At the same time, precise positioning reduces unnecessary friction loss and improves energy transfer efficiency.

[0073] Furthermore, this positioning system also brings convenience to maintenance. When carbon brush 3 needs to be replaced, the new carbon brush 3 can be quickly and accurately aligned and installed, reducing adjustment time. In batch repair operations, this design can significantly improve work efficiency and reduce maintenance costs.

[0074] Optionally, such as Figures 1-3 As shown, a limiting hole 301 is formed on the carbon brush 3 in this application, and a limiting post is provided in the limiting hole 301. The limiting post protrudes from the carbon brush 3. A guide portion 1014 extending along the length direction of the receiving portion 101 is formed on the top wall of the receiving portion 101. A portion of the limiting post is located in the guide portion 1014 and can slide relative to the guide portion 1014.

[0075] A limiting hole 301 is machined on the carbon brush 3, and a limiting post is provided in the hole, with the limiting post protruding from the surface of the carbon brush 3 at an appropriate height. Correspondingly, a guide portion 1014 extending along the length direction is formed on the top wall of the receiving portion 101. The guide portion 1014 has a long groove structure, and its cross-sectional shape matches the limiting post, but leaves an appropriate gap to allow relative sliding.

[0076] The cooperation between the limiting post and the guide part 1014 constitutes the guiding system of the carbon brush 3, ensuring that the carbon brush 3 moves in a straight line during wear without deflection or jamming. When the carbon brush 3 gradually shortens due to wear, it moves smoothly forward along the guide part 1014 under the push of the elastic element 2, while the limiting post slides within the guide part 1014, always maintaining the correct movement trajectory.

[0077] Therefore, the guide portion 1014 in this application can restrict the movement freedom of the carbon brush 3 to a single direction, avoiding movement in other directions. This constraint is particularly important in motor vibration environments, as it prevents irregular contact and wear between the carbon brush 3 and the wall of the housing portion 101, ensuring long-term operational stability.

[0078] In practical applications, the guide portion 1014 also serves to prevent misinstallation. Since the limiting post can only be set on the side of the carbon brush 3 with the limiting hole 301, the carbon brush 3 can only be installed in the correct direction, avoiding malfunctions caused by incorrect installation and reducing training requirements and quality risks. In addition, one end of the guide portion 1014 in this application is connected to the hollow portion 1011, so that during installation, the carbon brush 3 can be first placed into the receiving portion 101 through the second opening 1013, and then the positioning member 4 with the elastic member 2 can be installed. Since both the carbon brush 3 and the positioning member 4 have positioning systems for positioning the elastic member 2, the carbon brush 3, the positioning member 4 and the brush holder box 1 can be quickly installed. At the same time, the protruding limiting post can also prevent the carbon brush 3 from coming out of the receiving portion 101 from the first opening, thereby ensuring the stability of the overall structure to a certain extent.

[0079] Optionally, the motor brush holder provided in this application also includes a bearing and a bearing retainer ring. A bearing groove 103 is formed at the center of the brush holder box 1. The bearing is embedded in the bearing groove 103, and the bearing retainer ring is used to restrict the bearing in the bearing groove 103. There are two receiving parts 101, which are arranged opposite to each other along the radial direction of the bearing groove 103.

[0080] The brush holder box 1 has a bearing groove 103 at its center, the size of which matches the outer ring of the bearing. The bearing can be a deep groove ball bearing, with a precision grade that meets the motor requirements. The bearing retaining ring is an elastic retaining ring, installed in the slot of the bearing groove 103 to fix the bearing axially. There are two receiving parts 101, which are arranged radially opposite to each other along the bearing groove 103 to form a symmetrical structure.

[0081] The introduction of the bearing assembly allows the brush holder to directly support the motor rotor, simplifying the overall structure. The dimensional accuracy of the bearing groove 103 ensures that the bearing has an appropriate interference fit after installation, guaranteeing positioning accuracy while avoiding excessive compression. The bearing retainer ring is designed for easy installation and removal, while providing reliable axial fixation.

[0082] The symmetrical arrangement of the two housings 101 allows the overall structure to operate with two carbon brushes 3, thereby improving the smoothness of motor operation and reducing vibration and noise. At the same time, the dual carbon brush 3 design improves current transmission capability, making it suitable for high-power motor applications.

[0083] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A motor brush holder, characterized in that, This includes brush holder box, carbon brushes, elastic components, and positioning components; The brush holder box has a receiving portion, and a first opening and a second opening are formed at both ends of the receiving portion. The carbon brush and the elastic member are both disposed in the receiving portion. One end of the elastic member abuts against the carbon brush, so that the other end of the carbon brush extends out of the first opening. The receiving part has a hollowed-out portion corresponding to the position of the second opening, and a limiting portion is formed on the brush holder box. One end of the positioning member is engaged with the hollowed-out portion, and the other end is engaged with the limiting portion, so that the positioning member is blocked in the second opening, and the other end of the elastic member abuts against the positioning member.

2. The motor brush holder according to claim 1, characterized in that, The hollow portion is formed on the top wall of the receiving portion. The hollow portion and the edge of the top wall corresponding to the second opening are provided to form a limiting beam. The positioning member includes a first mating portion, which is engaged with the limiting beam to limit the position of the positioning member in the length direction of the receiving portion.

3. The motor brush holder according to claim 2, characterized in that, The positioning component includes a main body section, a transition section, and a first bending section. The transition section is perpendicular to the main body section, and one end of the transition section is connected to the main body section. The first bending section is perpendicular to the transition section, and the first bending section bends towards the brush holder box, making the first mating part U-shaped.

4. The motor brush holder according to claim 3, characterized in that, The positioning component further includes a second bent section, which is formed at one end of the first bent section and is perpendicular to the first bent section. The second bent section bends toward the main body section, and the end of the second bent section is spaced apart from the main body section.

5. The motor brush holder according to claim 3, characterized in that, A first positioning groove is formed in the middle of the main body segment, and one end of the elastic member is embedded in the first positioning groove.

6. The motor brush holder according to claim 5, characterized in that, A first positioning post is formed in the first positioning groove, and one end of the elastic member is embedded in the first positioning groove and sleeved on the first positioning post.

7. The motor brush holder according to claim 4, characterized in that, The main body segment has a third bending segment at the end away from the transition segment. The limiting part is a limiting groove. The third bending segment is embedded in the limiting groove, and the length of the limiting groove is greater than the size of the third bending segment. The width of the hollowed-out portion is not less than the width of the second bent section.

8. The motor brush holder according to claim 6, characterized in that, The carbon brush has a second positioning groove at one end within the receiving portion, and a second positioning post is formed in the second positioning groove. The second positioning groove corresponds to the first positioning groove, and the second positioning post corresponds to the first positioning post. The end of the elastic member away from the positioning member is embedded in the second positioning groove and sleeved on the second positioning post.

9. The motor brush holder according to claim 1, characterized in that, A limiting hole is formed on the carbon brush, and a limiting post is provided in the limiting hole. The limiting post protrudes from the carbon brush. A guide portion extending along the length direction of the receiving portion is formed on the top wall of the receiving portion. A portion of the limiting post is located in the guide portion and can slide relative to the guide portion.

10. The motor brush holder according to claim 1, characterized in that, It also includes a bearing and a bearing retainer ring. A bearing groove is formed at the center of the brush holder box. The bearing is embedded in the bearing groove, and the bearing retainer ring is used to confine the bearing in the bearing groove. There are two receiving portions, which are arranged opposite each other along the radial direction of the bearing groove.

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