Heat dissipation mechanism for wiper motor brush holder
By embedding copper busbars and filling them with thermally conductive adhesive into the wiper motor brush holder, the problem of brush holder melting due to high temperature was solved, the heat dissipation performance of the motor was improved, and motor failure was prevented.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SHANGHAI YUDIAN ELECTRONICS TECH CO LTD
- Filing Date
- 2025-03-13
- Publication Date
- 2026-07-02
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. The heat dissipation efficiency is improved by using heat dissipation fins and thermally conductive adhesive, taking advantage of the high heat transfer performance of the copper busbar and increasing the heat conduction area.
It effectively reduces brush temperature, prevents brush holders from melting, improves motor heat dissipation, and avoids motor burnout and seizure.
Smart Images
Figure CN2025082396_02072026_PF_FP_ABST
Abstract
Description
A heat dissipation mechanism for a wiper motor brush holder Technical Field
[0001] This utility model belongs to the field of wiper motor design, and in particular relates to a heat dissipation mechanism for a wiper motor brush holder. Background Technology
[0002] A brushed motor is a rotating electric motor that contains brushes and converts electrical energy into mechanical energy (electric motor). The working principle of a brushed motor is based on the interaction between a permanent magnet shaft and coils mounted on the rotor. When a DC voltage is applied to the coils, a magnetic field is generated within the coils, which interacts with the magnetic field on the permanent magnet shaft, causing the rotor to rotate within the stator. The carbon brushes, connected to the power supply and the coils, continuously change the direction of the current, enabling the rotor to rotate continuously.
[0003] The brush holder assembly in a brushed motor mainly includes a brush holder body and brush holders mounted on the brush holder body for mounting the brushes. The brush holder body is made of plastic. Because brushes are conductive components, they are subjected to friction, conductivity, and elasticity during motor operation, easily generating high temperatures on their surface, which can reach 250-330℃ in extreme cases. If this heat is not dissipated in time, the plastic of the brush holder body near the brush holders can melt, directly affecting the relative position of the carbon brushes and commutator, potentially leading to motor burnout and seizure. Therefore, there is an urgent need to provide a solution to the brush heat dissipation problem. Technical issues
[0004] The technical objective of this invention is to provide a heat dissipation mechanism for a wiper motor brush holder, in order to solve the heat dissipation problem of the wiper motor brush holder. Technical solutions
[0005] To solve the above problems, the technical solution of this utility model is as follows:
[0006] A heat dissipation mechanism for a wiper motor brush holder includes:
[0007] The plastic frame has a circular structure and is connected to the gearbox. The end face of the plastic frame connected to the gearbox is divided into an inductor mounting area and a brush mounting area according to the components installed inside.
[0008] The inductor is located in the inductor mounting area, which has two inductor mounting cavities, and the inductor is installed in the corresponding inductor mounting cavity.
[0009] The brush holder is located in the brush mounting area. The brush mounting area is recessed downwards to form a recessed area. Two brush holder mounting cavities are opened in the recessed area. The brush holder is installed in the corresponding brush holder mounting cavity and is configured to install the brush.
[0010] The heat sink is embedded in the recessed area. The heat sink has fixing holes. The brush holder is interference-fitted with the fixing holes of the heat sink to fix the heat sink.
[0011] The heat sink uses copper busbars.
[0012] Specifically, the gearbox has several heat dissipation fins at the corresponding heat sink, and a heat dissipation gap is left between the heat dissipation fins and the heat sink.
[0013] Furthermore, the heat dissipation gap between the heat dissipation fins and the heat sink is filled with thermally conductive adhesive.
[0014] The plastic frame has a pair of symmetrical connecting holes at the center, through which the plastic frame is fixedly connected to the gearbox. Beneficial effects
[0015] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:
[0016] This invention embeds a copper busbar into the motor brush holder, utilizing the high heat transfer efficiency of the copper busbar and increasing the heat conduction area to improve heat dissipation performance. Heat dissipation fins are installed on the gearbox corresponding to the copper busbar positions. Thermally conductive adhesive is filled between the copper busbar and the gearbox. Heat is transferred from the copper busbar to the heat dissipation fins via the adhesive, and then the gearbox receives the heat and dissipates it outwards, thus improving heat dissipation performance. Attached Figure Description
[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.
[0018] Figure 1 is a structural schematic diagram of the wiper motor brush holder of this utility model;
[0019] Figure 2 is a schematic diagram of the reverse structure of the wiper motor brush holder shown in Figure 1;
[0020] Figure 3 is a structural schematic diagram of the connection surface between the gearbox and the wiper motor brush holder of this utility model.
[0021] Explanation of reference numerals in the attached figures
[0022] 1: Plastic frame; 2: Inductor mounting cavity; 3: Brush holder mounting cavity; 4: Heat sink; 5: Connection hole; 6: Gearbox; 7: Heat dissipation fins. The best implementation method of this utility model
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.
[0024] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."
[0025] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the heat dissipation mechanism for a wiper motor brush holder according to this utility model. The advantages and features of this utility model will become clearer from the following description and claims.
[0026] Example
[0027] Referring to Figures 1 to 3, this embodiment provides a heat dissipation mechanism for a wiper motor brush holder. Its main body is a plastic frame 1, which has a ring-shaped structure with a rotor at its center (details omitted here). As seen in Figures 1 and 2, a pair of connecting holes 5 are located at the axis of symmetry of the plastic frame 1. These connecting holes 5 serve to fix the plastic frame 1 to the gearbox 6. As shown in Figure 1, this end face is connected to the gearbox 6. Based on the components installed within it, this end face can be divided into an inductor mounting area and a brush mounting area. Figure 1 clearly shows that the two connecting holes 5 are located in different mounting areas.
[0028] The inductor mounting area includes a pair of inductor mounting cavities 2, positioned symmetrically about the axis of symmetry of the plastic frame 1. Each inductor mounting cavity 2 extends through the entire plastic frame 1, and the inductor is installed within its corresponding cavity. The brush mounting area is recessed downwards from the inductor mounting area, forming a concave region. Two brush holder mounting cavities 3 are located within this concave region, also symmetrically about the axis of symmetry of the plastic frame 1. The brush holders are installed within their respective cavities for mounting the brushes.
[0029] Next, in this embodiment, the heat sink 4 is embedded in the recessed area. The heat sink 4 has several fixing holes. After the brush holder is installed in the brush holder mounting cavity 3, the protruding connector of the brush holder and the fixing holes of the heat sink 4 are interference-fitted, thereby firmly fixing the heat sink 4 and the brush holder. Preferably, the heat sink 4 is made of copper busbar.
[0030] Correspondingly, referring to Figure 3, the circular space of the gearbox 6 is connected to the plastic frame 1. Several heat dissipation ribs 7 are provided on the gearbox 6. After connecting to the plastic frame 1, the positions of the heat dissipation ribs 7 and the heat sink 4 correspond to each other. Furthermore, since the gearbox 6 is a metal structure, a heat dissipation gap is left between the heat dissipation ribs 7 and the heat sink 4 to avoid direct contact. To better achieve heat dissipation, thermally conductive adhesive is filled in the heat dissipation gap between the heat dissipation ribs 7 and the heat sink 4 to facilitate heat transfer.
[0031] In summary, this embodiment improves heat dissipation efficiency by embedding copper busbars in the motor brush holder, leveraging the high heat transfer efficiency of copper busbars and increasing the thermal conductivity area. Furthermore, heat dissipation fins 7 are positioned on the gearbox 6 corresponding to the copper busbars, and thermally conductive adhesive is filled between the copper busbars and the gearbox 6 to transfer heat from the copper busbars to the heat dissipation fins 7. The gearbox 6 then receives the heat and dissipates it outwards. Compared to the original air cooling within a narrow space, this method further enhances heat dissipation efficiency.
[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.
Claims
1. A heat dissipation mechanism for a wiper motor brush holder, characterized in that, include: A plastic frame, the structure of which is circular and connected to the gearbox; the end face of the plastic frame connected to the gearbox is divided into an inductor mounting area and a brush mounting area according to the components installed inside it; An inductor is located within the inductor mounting area, which has two inductor mounting cavities, and the inductor is mounted in the corresponding inductor mounting cavity. A brush holder is located in the brush mounting area, which is recessed downwards to form a concave area. Two brush holder mounting cavities are formed in the concave area, and the brush holder is installed in the corresponding brush holder mounting cavity and is configured to install a brush. A heat sink is embedded in the recessed area. The heat sink has a fixing hole. The brush holder is interference-fitted with the fixing hole of the heat sink to fix the heat sink.
2. The heat dissipation mechanism of the wiper motor brush holder according to claim 1, characterized in that, The heat sink uses copper busbars.
3. The heat dissipation mechanism for the wiper motor brush holder according to claim 1, characterized in that, The gearbox is provided with several heat dissipation ribs corresponding to the heat sink, and a heat dissipation gap is left between the heat dissipation ribs and the heat sink.
4. The heat dissipation mechanism of the wiper motor brush holder according to claim 3, characterized in that, Thermally conductive adhesive is used to fill the space between the gearbox and the heat sink.
5. The heat dissipation mechanism for the wiper motor brush holder according to claim 1, characterized in that, The plastic frame has a pair of symmetrical connecting holes at the center, through which the plastic frame is fixedly connected to the gearbox.