A high-heat-dissipation carbon brush holder for automotive generators

Abstract

This utility model discloses a high-heat-dissipation carbon brush holder for automotive generators, comprising a bearing plate, a heat-conducting plate, and a centrifugal impeller. The centrifugal impeller is rotatably mounted inside the heat-conducting plate, which is fixedly mounted on the bottom surface of the bearing plate. The heat-conducting plate has several heat-dissipating fins on its surface, with the top surfaces of the fins adhered to the bottom surface of the bearing plate. Several sleeves are fixedly mounted on the surface of the bearing plate, each sleeve having a carbon brush slidably fitted inside, and an elastic ring fitted onto the surface of the carbon brush. The surface of the bearing plate has air inlets and ventilation slots to guide airflow into the surface of the centrifugal impeller. The outer edges of the air inlets and sleeves have conical bevel structures, and the ventilation slots are evenly distributed circumferentially. The bearing plate and heat-conducting plate are made of metal with an insulating layer on their surfaces. This structure achieves efficient heat dissipation, adaptive adjustment, and electrical isolation during carbon brush operation, significantly improving the stability and reliability of the carbon brush holder under high-temperature and high-speed environments.

Description

Technical Field

[0001] This utility model relates to the field of motor carbon brush technology, specifically a high-heat-dissipation carbon brush holder for automotive generators. Background Technology

[0002] With the increasing electrification of automobiles, the automotive alternator plays a crucial role in the vehicle's power system, and its operational stability directly affects the reliability of the entire vehicle's electrical system. Carbon brushes, as vital components in the alternator for energy conduction and commutation, must maintain stable contact with rotating parts (such as slip rings or commutators) and operate under high speed and high temperature conditions for extended periods.

[0003] In existing technologies, common carbon brush holder structures generally consist of an insulating bracket, a carbon brush assembly, and simple springs or spring clips. To reduce size and cost, some structures directly mount the carbon brushes within a fixed brush holder and press them inward with springs to establish contact with the rotating body. However, in practical applications, existing technologies still suffer from the following typical problems:

[0004] During generator operation, the carbon brush contact surface generates a large amount of heat due to friction and current flow. Traditional carbon brush holders are mostly made of plastic or low thermal conductivity materials, which have limited heat dissipation capacity. The heat is difficult to release in time, leading to high-temperature ablation of the carbon brushes, increased contact resistance, and even failure problems such as melting and detachment of the carbon brush holder.

[0005] Most carbon brush holders are not designed with independent airflow paths or air-cooling mechanisms, relying on the generator body for heat dissipation, resulting in low cooling efficiency; although some structures have ventilation holes, the airflow organization is unreasonable, making it difficult to achieve effective guidance and heat exchange.

[0006] In view of this, we have studied and improved upon the existing problems to provide a high-heat-dissipation carbon brush holder for automotive generators, aiming to solve the current problems and improve the practical value through this technology. Utility Model Content

[0007] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0008] Therefore, the technical solution adopted by this utility model is as follows: a high-heat-dissipation carbon brush holder for automotive generators, comprising: a bearing plate, a heat-conducting plate, and a centrifugal impeller, wherein the centrifugal impeller is rotatably mounted inside the heat-conducting plate; the heat-conducting plate is fixedly mounted on the bottom surface of the bearing plate, and its surface is provided with several heat dissipation fins, the top surface of each heat dissipation fin being adhered and fixed to the bottom surface of the bearing plate; several sleeves are fixedly mounted on the surface of the bearing plate, each sleeve having a carbon brush slidably fitted inside, and each carbon brush having an elastic ring fitted on its surface; the surface of the bearing plate is provided with air inlet holes and ventilation slots for allowing external airflow into the surface of the centrifugal impeller. Through the above structure, an active air-cooling channel can be formed within the carbon brush holder, achieving dynamic heat exchange, thereby improving the operating temperature control capability of the carbon brush system.

[0009] In one possible implementation, the elastic ring is an elastic ring structure, and this elastic ring is parallel to and coaxially arranged with the bearing surface, used to link the individual carbon brushes to achieve radial sliding compensation inside the sleeve. This structure can automatically adjust the contact state between the carbon brush and the slip ring, maintain stable contact pressure, and extend the life of the carbon brush.

[0010] In one possible implementation, the heat dissipation fins are located between the support plate and the heat conduction plate. Several heat dissipation fins are divided into multiple groups, with the fins within each group arranged parallel to each other. Each group is distributed circumferentially around the outer periphery of the centrifugal impeller. This arrangement can create heat dissipation paths in multiple directions, improving airflow and heat exchange efficiency.

[0011] In one possible implementation, the centrifugal impeller surface is provided with a sleeve hole for fitting onto the end of the automotive generator shaft, and the outer edge of the sleeve hole is designed with a tapered bevel to guide airflow in. This structure optimizes the centrifugal impeller's intake efficiency, increases the cooling airflow introduction rate, and enhances the system's ventilation capacity.

[0012] In one possible implementation, the outer edge of the air inlet vent has a tapered bevel structure, and multiple ventilation slots are evenly distributed circumferentially around the outer periphery of the air inlet vent. When the centrifugal impeller rotates, airflow enters the gap area between the bearing plate and the heat conduction plate through the air inlet vent and the ventilation slots. Under the combined effect of the tapered bevel and the inclined arrangement of the ventilation slots, an obliquely directed airflow path is formed, thereby guiding the airflow between the heat dissipation fins and the heat conduction plate. This structure can form a continuous negative pressure intake cooling airflow path, significantly improving the heat exchange efficiency inside the carbon brush holder.

[0013] In one possible implementation, both the bearing plate and the heat-conducting plate are made of metal, and the surface of the bearing plate and the inner side of the sleeve are provided with an insulating layer for contact with the carbon brush. The metal components can improve the overall thermal conductivity, while the insulating layer ensures electrical isolation during the operation of the carbon brush, guaranteeing safety in use.

[0014] In one possible implementation, a slip ring assembly is fitted around the outer periphery of the centrifugal impeller, with its outer ring sliding against the inner side of the heat conduction disk to achieve electrical contact conduction between the rotating and stationary parts.

[0015] This structure provides a highly stable electrical connection method and has the dual functions of current transmission and airflow guidance, improving system integration and operational reliability.

[0016] The beneficial effects achieved by this utility model are as follows:

[0017] 1. In this utility model, the heat conduction plate and the bearing plate are closely fitted by multiple sets of heat dissipation fins, and combined with the airflow guide structure (air inlet hole and ventilation groove) generated by the centrifugal impeller, a high-efficiency heat dissipation channel is formed, which can significantly improve the heat dissipation efficiency of the carbon brush holder, effectively extend the service life of the carbon brush and improve the operating stability of the generator.

[0018] 2. In this utility model, the carbon brush is radially linked and slides through the structure of the carbon brush, sleeve and elastic ring. This can automatically compensate for the contact pressure during the wear of the carbon brush and maintain stable electrical contact. At the same time, the surface of the bearing plate and sleeve is provided with an insulating layer to ensure the insulation safety of the carbon brush when it works in the metal heat-conducting structure, thereby improving the electrical reliability and safety performance of the whole machine. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0020] Figure 2 This is a partial cross-sectional structural diagram of one embodiment of the present invention;

[0021] Figure 3 This is an exploded structural diagram of one embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the heat conduction disk and centrifugal impeller structure according to an embodiment of the present invention.

[0023] Figure label:

[0024] 100. Bearing plate; 110. Sleeve; 120. Carbon brush; 121. Elastic ring; 101. Air inlet hole; 102. Ventilation slot;

[0025] 200. Heat conduction plate; 210. Heat dissipation fins; 300. Centrifugal fan. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0027] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0028] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a high-heat-dissipation carbon brush holder for automotive generators.

[0029] Combination Figures 1-4 As shown, this utility model provides a high-heat-dissipation carbon brush holder for automotive generators, which includes a support plate 100, a heat-conducting plate 200, and a centrifugal impeller 300. The centrifugal impeller 300 is rotatably mounted on the inner side of the heat-conducting plate 200 and can rotate synchronously with the generator shaft.

[0030] The heat conduction plate 200 is fixedly installed on the bottom surface of the support plate 100 to form a heat conduction path. A plurality of heat dissipation fins 210 are evenly arranged on the outer surface of the heat conduction plate 200. The top surface of each heat dissipation fin 210 is fixedly connected to the bottom surface of the support plate 100 by thermal bonding, thereby ensuring that heat is efficiently conducted from the support plate 100 to the heat dissipation fins 210, and then carried away by airflow.

[0031] Several sleeves 110 are fixedly mounted on the top surface of the bearing plate 100. A carbon brush 120 is slidably fitted into the inner cavity of each sleeve 110. An elastic ring 121 is fitted onto the surface of the carbon brush 120 to maintain a stable contact pressure between the carbon brush 120 and the slip ring (not shown). The elastic ring 121 has a ring-shaped structure, is parallel to the surface of the bearing plate 100 and coaxially arranged with it. Its structure allows multiple carbon brushes 120 to slide radially within the sleeve 110, achieving automatic wear compensation.

[0032] The surface of the bearing plate 100 is provided with air inlet holes 101 and several ventilation slots 102. The air inlet holes 101 are used to guide external air into the interior of the carbon brush holder, and the ventilation slots 102 are evenly distributed in a circumferential direction on the outer periphery of the air inlet holes 101 to assist in airflow introduction. In particular, the outer edge of the port of the air inlet holes 101 is set as a tapered bevel to enhance the airflow introduction efficiency; the ventilation slots 102 are also inclined, so that the airflow enters obliquely into the space between the bearing plate 100 and the heat conduction plate 200, further improving the permeability of the cooling airflow.

[0033] The centrifugal impeller 300 has a sleeve hole in the middle, which is used to fit onto the shaft end of the automobile generator to achieve coaxial rotation. To guide airflow, the outer edge of the sleeve hole is also designed as a tapered bevel, which can create negative pressure during the rotation of the centrifugal impeller 300 to guide airflow in and improve air intake efficiency.

[0034] During operation, as the generator main shaft rotates, the centrifugal impeller 300 rotates accordingly. Under its action, external airflow enters the gap space between the bearing plate 100 and the heat conduction plate 200 through the air inlet 101 and the ventilation slot 102. Due to the guiding structure of the air inlet 101 and the ventilation slot 102, the airflow direction is optimized to flow obliquely, thereby fully scouring the surface of the heat dissipation fins 210. This allows the heat generated by the heat conduction plate 200 and the bearing plate 100 to be quickly transferred and carried away by the airflow, improving the overall heat dissipation efficiency of the carbon brush holder.

[0035] Both the bearing plate 100 and the heat-conducting plate 200 are made of metal, preferably aluminum alloy or copper alloy, to enhance thermal conductivity. To prevent short circuits caused by contact between the carbon brush 120 and the conductive structure, an insulating layer is provided on the surface of the bearing plate 100 and the inner side of the sleeve 110. This insulating layer can be an insulating gasket or a sprayed insulating varnish layer to ensure the electrical safety of the carbon brush 120 during operation.

[0036] In addition, a slip ring assembly (not numbered) is fitted around the outer periphery of the centrifugal impeller 300. The outer ring of the slip ring slides against the inner side of the heat conduction disk 200, which can ensure stable conduction of electrical connection between the carbon brush 120 and the circuit system and maintain its reliability during rotation.

[0037] In summary, this utility model provides driving airflow through the centrifugal impeller 300, which, together with the heat dissipation fins 210 structure and the air intake vents 101 and ventilation slots 102, forms an efficient cooling system. At the same time, by utilizing the thermal conductivity structure of the metal material combined with the carbon brush support elastic adjustment mechanism, a compact, thermally conductive, stable carbon brush contact, and reliable insulation automotive alternator carbon brush holder device is achieved.

[0038] Working principle and usage process of this utility model:

[0039] The centrifugal impeller 300 is installed inside the heat transfer plate 200 and rotates with the generator shaft to generate centrifugal wind. This wind draws external air into the system through the air inlet 101 and ventilation slot 102 on the bearing plate 100, forming a continuous cooling airflow.

[0040] The surface of the heat conduction plate 200 is provided with multiple heat dissipation fins 210, the top surface of which is in contact with the bottom surface of the support plate 100. The intake airflow is guided through the gap between the heat dissipation fins 210 and the heat conduction plate 200, carrying away heat and improving the overall heat dissipation efficiency.

[0041] Several carbon brushes 120 are fitted inside the sleeve 110. Through the linkage adjustment of the elastic ring 121, the carbon brushes can automatically compensate for sliding in the radial direction, ensuring that the carbon brushes are in continuous and reliable contact with the rotating parts.

[0042] The bearing plate 100 and the heat conduction plate 200 are made of metal to improve heat conduction efficiency; their surfaces and the inner side of the sleeve are provided with an insulating layer to effectively prevent short circuits or leakage of the conductive parts of the carbon brush.

[0043] The outer edge of the air inlet 101 and the sleeve of the centrifugal impeller 300 both adopt a conical bevel structure to guide the airflow into the direction and distribute it evenly to the heat conduction area, thereby further improving the efficiency of the heat dissipation channel.

[0044] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high heat dissipation carbon brush holder for an automobile generator, characterized by, include: The device comprises a bearing plate (100), a heat-conducting plate (200), and a centrifugal impeller (300). The centrifugal impeller (300) is rotatably mounted inside the heat-conducting plate (200). The heat-conducting plate (200) is fixedly mounted on the bottom surface of the bearing plate (100). The surface of the heat-conducting plate (200) is provided with several heat dissipation fins (210). The top surface of each heat dissipation fin (210) is bonded to the bottom surface of the bearing plate (100). Several sleeves (110) are fixedly mounted on the surface of the bearing plate (100). A carbon brush (120) is slidably sleeved inside each sleeve (110). An elastic ring (121) is sleeved on the surface of each carbon brush (120). The surface of the bearing plate (100) is provided with an air inlet hole (101) and a ventilation groove (102) for airflow into the surface of the centrifugal impeller (300).

2. The high-radiating carbon brush holder for an automobile generator according to claim 1, characterized by The elastic ring (121) is an elastic ring structure, and the elastic ring (121) is parallel to and coaxially arranged with the surface of the bearing plate (100) to link the various carbon brushes (120) to move radially inside the sleeve (110).

3. The high-radiating carbon brush holder for an automobile generator according to claim 1, characterized by The heat dissipation fins (210) are located between the bearing plate (100) and the heat conduction plate (200), and the heat dissipation fins (210) are divided into multiple groups. Each heat dissipation fin (210) in each group is arranged in parallel to each other, and each group of heat dissipation fins (210) is distributed in a circumferential direction on the outer periphery of the centrifugal impeller (300).

4. The high-radiating carbon brush holder for an automobile generator according to claim 1, characterized by The centrifugal impeller (300) has a sleeve hole on its surface that fits onto the generator shaft end, and the outer edge of the sleeve hole is tapered and beveled for guiding airflow.

5. The high-radiating carbon brush holder for an automobile generator according to claim 1, characterized by The outer edge of the air inlet hole (101) is tapered and beveled, and several ventilation slots (102) are evenly distributed in a circular direction on the outer periphery of the air inlet hole (101).

6. The high-radiating carbon brush holder for an automobile generator according to claim 1, wherein Both the bearing plate (100) and the heat conduction plate (200) are made of metal. The surface of the bearing plate (100) and the inner side of the sleeve (110) are provided with an insulating layer for contact with the surface of the carbon brush (120).

7. The high-radiating carbon brush holder for an automobile generator according to claim 1, characterized by The centrifugal impeller (300) is rotatably fitted with a slip ring on its outer circumference, and the outer circumference of the slip ring slides against the inner side of the heat conduction disk (200).

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