Heat dissipation mechanism of wiper motor brush holder
By embedding copper busbars into the wiper motor brush holder and filling them with thermally conductive adhesive, the problem of brush melting at high temperatures was solved, heat dissipation efficiency was improved, and the normal operation of the motor was ensured.
Patent Information
- Application Number
- CN202423249296.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-27
AI Technical Summary
During operation, the plastic brush holder of the wiper motor melts due to the high temperature of the brush, affecting the normal operation of the motor. Existing technology has not been able to effectively solve the heat dissipation problem.
A copper busbar is embedded in the wiper motor brush holder as a heat sink, and thermally conductive adhesive is filled between the copper busbar and the gearbox. Heat is transferred through the heat sink fins to improve heat dissipation efficiency.
By combining copper busbars and thermally conductive adhesive, the heat dissipation performance of the wiper motor brush holder is significantly improved, preventing the brush holder from melting and ensuring normal motor operation.
Smart Images
Figure CN223680908U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of wiper motor design, especially relate to a heat dissipation mechanism of wiper motor brush holder. BACKGROUND
[0002] Brush motor is a device containing brush, which can convert electrical energy into mechanical energy (motor) of rotating motor. The working principle of brush motor is based on the interaction between permanent magnet shaft and coil installed on the rotor. When a direct current voltage is applied to the coil, a magnetic field will be generated in the coil, which interacts with the magnetic field on the permanent magnet shaft, causing the rotor to rotate in the stator. The carbon brush connecting the power supply and the coil changes the direction of current continuously, so that the rotor runs continuously.
[0003] The brush holder assembly in the brush motor mainly includes a brush holder body and a brush holder for installing the brush on the brush holder body. The brush holder body is made of plastic. Since the brush is an electrically conductive component, it is affected by friction, electrical conductivity, and elastic force during motor operation, and can easily generate high temperature on the surface, which can reach 250~330℃ in extreme cases. If the heat is not removed in time, the plastic of the brush holder near the brush holder will melt, directly affecting the relative position of the carbon brush and the commutator, and easily causing motor burnout and jamming. Therefore, it is urgent to provide a solution to solve the heat dissipation problem of the brush. SUMMARY
[0004] The technical object of the utility model is to provide a heat dissipation mechanism of wiper motor brush holder, to solve the heat dissipation problem of wiper motor brush holder.
[0005] To solve the above problems, the technical scheme of the utility model is as follows:
[0006] A heat dissipation mechanism of wiper motor brush holder, comprising:
[0007] The plastic holder body is annular in structure and connected to the gear box. One end surface of the plastic holder body connected to the gear box is divided into an inductor installation area and a brush installation area according to the components installed therein;
[0008] The inductor is located in the inductor installation area. Two inductor installation cavities are formed in the inductor installation area, and the inductor is installed in the corresponding inductor installation cavity;
[0009] The brush holder is located in the brush installation area. The brush installation area is recessed downward to form a recessed area. Two brush holder installation cavities are formed in the recessed area, and the brush holder is installed in the corresponding brush holder installation cavity and configured to install the brush;
[0010] The heat dissipation fin is embedded in the recessed area. The heat dissipation fin is provided with a fixing hole, and the brush holder is in interference fit with the fixing hole of the heat dissipation fin to fix the heat dissipation fin.
[0011] The heat sink is a copper bar.
[0012] Specifically, the gear box is provided with a plurality of heat dissipation ribs at the position corresponding to the heat sink, and a heat dissipation gap is left between the heat dissipation ribs and the heat sink.
[0013] Further, the heat dissipation gap between the heat dissipation ribs and the heat sink is filled with heat-conducting glue.
[0014] The plastic frame body is fixedly connected with the gear box through the connecting holes.
[0015] Compared with the prior art, the utility model has the following advantages and positive effects:
[0016] The copper bar is embedded in the motor brush holder, the high heat transfer efficiency of the copper bar is utilized, and the heat dissipation area is increased to improve the heat dissipation performance.The heat dissipation ribs are arranged on the gear box at the position corresponding to the copper bar, the heat-conducting glue is filled between the copper bar and the gear box, the heat is transferred from the copper bar to the heat dissipation ribs through the heat-conducting glue, and then the heat is received by the gear box and dissipated outward to improve the heat dissipation performance. BRIEF DESCRIPTION OF DRAWINGS
[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present utility model.
[0018] Figure 1 Fig. 1 is a structure schematic view of a rain wiper motor brush holder of the utility model;
[0019] Figure 2 Fig. 2 is a structure schematic view of a front surface of the rain wiper motor brush holder shown in Fig. 1; Figure 1
[0020] Figure 3 Fig. 4 is a structure schematic view of a connecting surface between a gear box and the rain wiper motor brush holder of the utility model.
[0021] REFERENCE SIGNS
[0022] 1: plastic frame body; 2: inductance mounting cavity; 3: brush holder mounting cavity; 4: heat sink; 5: connecting hole; 6: gear box; 7: heat dissipation rib. DETAILED DESCRIPTION
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific implementation manners of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without any creative effort, and other embodiments can also be obtained.
[0024] For the sake of simplicity of the drawings, only parts related to the present application are schematically shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the components with the same structure or function is schematically shown, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one" situation.
[0025] The heat dissipation mechanism of the wiper motor brush holder according to the present application will be further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description and claims.
[0026] Embodiment
[0027] Reference Figures 1 to 3 The present embodiment provides a heat dissipation mechanism of a wiper motor brush holder, the main body of which is a plastic frame body 1, the structure of the plastic frame body 1 is in the form of a ring, and a rotor is arranged at the center of the ring, which will not be described too much here. As can be seen from Figure 1 and Figure 2 , a pair of connecting holes 5 are arranged at the position of the symmetry axis of the plastic frame body 1, which are used to fix and connect the plastic frame body 1 and the gear box 6. As shown in Figure 1 , the end surface is connected with the gear box 6, and the above-mentioned end surface can be divided into an inductor installation area and a brush installation area according to the components installed therein, and Figure 1 It can be clearly seen that the two connecting holes 5 are located in different installation areas.
[0028] Among them, a pair of inductor installation cavities 2 are arranged in the inductor installation area, the positions of the two inductor installation cavities 2 are symmetrical to each other with respect to the symmetry axis of the plastic frame body 1, the inductor installation cavities 2 penetrate through the entire plastic frame body 1, and the inductors are installed in the corresponding inductor installation cavities 2. The brush installation area is recessed downward compared to the inductor installation area to form a recessed area, two brush holder installation cavities 3 are arranged in the recessed area, and similarly, the positions of the two brush holder installation cavities 3 are symmetrical to each other with respect to the symmetry axis of the plastic frame body 1, the brush holder is installed in the corresponding brush holder installation cavity 3, and it is used to install the brush.
[0029] Then, in the embodiment, the heat sink 4 is embedded into the recessed area, and a plurality of fixing holes are formed on the heat sink 4. After the brush holder is installed in the brush holder installation cavity 3, the connecting member extended from the brush holder is in interference fit with the fixing holes of the heat sink 4, so as to firmly fix the heat sink 4 and the brush holder. Preferably, the heat sink 4 is made of copper bar.
[0030] Correspondingly, referring to Figure 3 , the circular space of the gear box 6 is connected with the plastic frame body 1. A plurality of heat dissipation ribs 7 are arranged on the gear box 6, and the heat dissipation ribs 7 correspond to the positions of the heat sink 4 after the plastic frame body 1 is connected. Since the gear box 6 is a metal structure, in order to avoid direct contact with the heat sink 4, a heat dissipation gap is left between the heat dissipation ribs 7 and the heat sink 4. In order to better achieve heat dissipation, heat-conducting glue is filled in the heat dissipation gap between the heat dissipation ribs 7 and the heat sink 4, so as to achieve heat transfer.
[0031] In summary, in the embodiment, the copper bar is embedded in the motor brush holder, the high-efficiency heat transfer efficiency of the copper bar is utilized, and the heat transfer area is increased, so as to improve the heat dissipation efficiency. On the other hand, the heat dissipation ribs 7 are arranged on the gear box 6 corresponding to the positions of the copper bar, and the heat-conducting glue is filled between the copper bar and the gear box 6, so as to transfer the heat from the copper bar to the heat dissipation ribs 7, and then the heat is received by the gear box 6 and dissipated outward. Compared with the air heat dissipation in the original narrow space, the heat dissipation efficiency is further improved.
[0032] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments. Even if various changes are made to the utility model, if the changes belong to the scope of the utility model claims and equivalent technologies, they still fall within the protection scope of the utility model.
Claims
1. A heat dissipation mechanism of a wiper motor brush holder, characterized in that, The application relates to a plastic frame body which is circular in structure and connected with a gear box; one end surface of the plastic frame body is divided into an inductor installation area and a brush installation area according to the components installed therein; an inductor is arranged in the inductor installation area; two inductor installation cavities are formed in the inductor installation area; the inductor is installed in the corresponding inductor installation cavity; a brush holder is arranged in the brush installation area; the brush installation area is concave downward to form a recessed area; two brush holder installation cavities are formed in the recessed area; the brush holder is installed in the corresponding brush holder installation cavity and is configured to install a brush; a heat sink is embedded in the recessed area; the heat sink is provided with a fixing hole; the brush holder is in interference fit with the fixing hole of the heat sink to fix the heat sink. The heat sink is made of copper. The gear box is provided with a plurality of heat dissipation ribs corresponding to the heat sink; heat dissipation gaps are formed between the heat dissipation ribs and the heat sink. Thermal conductive glue is filled between the gear box and the heat sink. The plastic frame body is provided with a pair of connection holes which are symmetric to the center; the plastic frame body and the gear box are fixedly connected through the connection holes.
2. The rain wiper motor brush holder heat dissipation mechanism according to claim 1, wherein, 3. The rain wiper motor brush holder heat dissipation mechanism according to claim 1, wherein, 4. The rain wiper motor brush holder heat dissipation mechanism according to claim 3, wherein, 5. The rain wiper motor brush holder heat dissipation mechanism according to claim 1, wherein,