Automobile starter motor commutator
By introducing multiple heat dissipation structures such as guide microslots, airflow slots, and heat dissipation fins into the commutator of the automotive starter motor, the problem of insufficient heat dissipation of the commutator is solved, achieving a more efficient heat dissipation effect and extending its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANGU GRP CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-26
AI Technical Summary
The existing automotive starter motor commutator has insufficient heat dissipation, leading to overheating and affecting its service life.
It adopts a multi-layer heat dissipation structure design, including flow guide microslots, airflow slots and heat dissipation fins, combined with copper metal commutator plates and insulating sleeves to enhance heat dissipation efficiency.
By combining multiple heat dissipation structures, the heat dissipation efficiency of the commutator is improved and its service life is extended.
Smart Images
Figure CN224418170U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor commutator technology, and in particular to a commutator for an automotive starter motor. Background Technology
[0002] With the development of the new energy vehicle industry, more and more people are riding in electric vehicles. The motor is the core component of an electric vehicle, and the commutator is one of the core components of the motor. The function of the commutator is to achieve a periodic change in the direction of current between the rotating armature winding and the stationary external circuit through mechanical commutation, ensuring that the motor rotor continuously receives directional electromagnetic torque and operates smoothly. However, during operation, the commutator generates heat due to the contact resistance between the current passing through the commutator segments and brushes, winding copper losses, and mechanical friction. Existing commutators generally have poor heat dissipation, leading to overheating after prolonged operation. High temperatures accelerate commutator segment metal fatigue and insulation material aging, resulting in increased commutator segment wear and damage to the lubricating film between the brushes and commutator segments, reducing service life. Therefore, in response to the above situation, there is an urgent need to develop an automotive starter motor commutator that improves the heat dissipation efficiency of the commutator through a combination of multiple heat dissipation structures, thereby extending the commutator's service life, to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content
[0003] The purpose of this invention is to provide a commutator for an automotive starter motor to solve the problems mentioned in the background section.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A car starter motor commutator includes an inner shaft and metal commutator segments. Multiple metal commutator segments are fixed to the outer side of the inner shaft. An insulating sleeve is fixed between the inner shaft and the metal commutator segments. A mica sheet is fixed between any two adjacent metal commutator segments. The surface of each metal commutator segment is provided with flow guiding microgrooves. Multiple airflow grooves are provided on the rear side of each metal commutator segment. A heat dissipation fin is fixed to the upper end of each metal commutator segment. The heat dissipation fin is bent downwards.
[0006] Preferably, the metal commutator segment is made of copper.
[0007] Preferably, the depth of the flow-guiding microgroove is 0.1-0.2 mm.
[0008] Preferably, each of the metal commutator segments has a hook-shaped end fixed at its bottom.
[0009] The beneficial effects of this invention are as follows: When the automotive starter motor commutator is in operation, the motor brushes contact the metal commutator segments, and the inner shaft and metal commutator segments are rotating. At this time, the heat and dust generated by the sliding of the conductive brushes are discharged along the guide micro-grooves. The airflow grooves allow airflow to pass through and carry away the heat from the metal commutator segments. Furthermore, the heat dissipation fins increase the contact area between the metal commutator segments and the air, improving heat dissipation. Simultaneously, as the heat dissipation fins rotate with the metal commutator segments, they drive the airflow downwards, carrying away heat from the surface of the metal commutator segments and thus reducing their temperature. In summary, this invention improves the heat dissipation efficiency of the commutator through the combination of multiple heat dissipation structures, thereby extending the service life of the commutator. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .
[0011] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .
[0012] Figure 3 This is a top view of the present invention.
[0013] Legend:
[0014] 1. Inner shaft; 2. Metal commutator; 201. Guide microgroove; 202. Airflow groove; 3. Mica sheet; 4. Heat dissipation fins; 5. Insulating sleeve; 6. Hook-shaped end. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0016] Specific implementation examples are given below.
[0017] See Figures 1-3In this embodiment of the invention, the commutator of the automotive starter motor includes an inner shaft 1 and metal commutator segments 2. Multiple metal commutator segments 2 are fixed to the outer side of the inner shaft 1. The metal commutator segments 2 are made of copper. An insulating sleeve 5 is fixed between the inner shaft 1 and the metal commutator segments 2, thereby insulating and isolating them. A mica sheet 3 is fixed between any two adjacent metal commutator segments 2, insulating and isolating them. The surface of the metal commutator segments 2 is provided with… There is a flow guiding microchannel 201 with a depth of 0.1-0.2mm. The heat and dust generated when the conductive brush slides are discharged along the flow guiding microchannel 201. Multiple airflow slots 202 are provided on the rear side of the metal commutator 2. The airflow slots 202 are provided so that airflow can pass through them and carry away the heat of the metal commutator 2. A heat dissipation fin 4 is fixed at the upper end of each metal commutator 2. The heat dissipation fin 4 is bent downwards. The heat dissipation fin 4 increases the contact area between the metal commutator 2 and the air, thereby improving heat dissipation.
[0018] Each of the metal commutator segments 2 has a hook-shaped end 6 fixed at its bottom, which is used to install enameled wire.
[0019] The inner side of the metal commutator segment 2 has a groove (not shown in the figure) for welding armature winding leads.
[0020] Working principle: When the commutator of this car starter motor is working, the motor brushes are in contact with the metal commutator segment 2. The inner shaft 1 and the metal commutator segment 2 are in a rotating state. At this time, the heat and dust generated when the conductive brush slides are discharged along the guide micro-groove 201. The airflow groove 202 is set so that the airflow passes through it and carries away the heat of the metal commutator segment 2. In addition, the heat dissipation fins 4 increase the contact area between the metal commutator segment 2 and the air, improving heat dissipation. At the same time, when the heat dissipation fins 4 rotate with the metal commutator segment 2, they will drive the airflow downward. The airflow carries away the heat on the surface of the metal commutator segment 2, thereby reducing the temperature of the metal commutator segment 2.
[0021] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 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 according to the specific circumstances.
[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A commutator for an automotive starter motor, characterized in that, The device includes an inner shaft (1) and metal commutator segments (2). Multiple metal commutator segments (2) are fixed on the outer side of the inner shaft (1). An insulating sleeve (5) is fixed between the inner shaft (1) and the metal commutator segments (2). A mica sheet (3) is fixed between any two adjacent metal commutator segments (2). A flow guiding microgroove (201) is provided on the surface of the metal commutator segments (2). Multiple airflow grooves (202) are provided on the rear side of the metal commutator segments (2). A heat dissipation fin (4) is fixed at the upper end of each metal commutator segment (2). The heat dissipation fin (4) is bent downward.
2. The automotive starter motor commutator according to claim 1, characterized in that, The metal commutator segment (2) is made of copper.
3. The automotive starter motor commutator according to claim 1, characterized in that, The depth of the flow-guiding microgroove (201) is 0.1-0.2 mm.
4. The commutator for an automotive starter motor according to claim 1, characterized in that, Each of the metal commutator segments (2) has a hook-shaped end (6) fixed at its bottom.