A starter structure with overheat protection
Patent Information
- Application Number
- CN202522049864.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-24
AI Technical Summary
[0006]有鉴于此，本实用新型提供一种带过热保护的起动机结构，克服现有起动机缺少过热保护功能导致起动机易损坏的缺陷
[0019] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:
Smart Images
Figure CN224664713U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of starter technology, specifically to a starter structure with overheat protection. Background Technology
[0002] As a core component of the automotive engine starting system, the starter motor is responsible for converting the electrical energy from the battery into mechanical energy, thereby driving the engine crankshaft to rotate and achieving the crucial task of starting the engine. Because the starter motor is a short-duty device, under normal circumstances, each start-up operation lasts for a short period, and the heat generated by the starter motor can be dissipated quickly without seriously affecting its performance and lifespan.
[0003] However, in actual use, many external factors may interfere with the normal working mode of the starter motor. For example, in cold weather, the viscosity of the engine oil increases, and the starting resistance increases. Users may need to try to start the starter motor multiple times or for a long time to successfully start the car. Or, when the engine malfunctions, users may repeatedly start the starter motor to try to troubleshoot the problem, which may cause the starter motor to remain in working condition for a long time.
[0004] Prolonged operation of a starter motor causes its temperature to rise rapidly. The starter motor contains a large amount of insulating material, whose physical and chemical properties gradually deteriorate under high temperatures, eventually leading to insulation failure. Once the insulation fails, a short circuit can easily occur in the starter motor's internal circuitry. This short circuit further exacerbates abnormal current flow, generating a large amount of heat, which may ultimately burn out the starter motor. This not only severely affects the normal use of the vehicle and increases repair costs, but also may cause other safety problems due to starter motor failure, bringing great inconvenience and potential risks to the user. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] In view of this, the present invention provides a starter structure with overheat protection, overcoming the defect of existing starters lacking overheat protection function, which leads to easy damage to the starter.
[0007] (II) Technical Solution
[0008] To solve the aforementioned technical problem, this utility model provides a starter structure with overheat protection, including a brush holder base plate, several brush boxes mounted on the brush holder base plate, and a rear cover covering the brush boxes. Each brush box contains an electric brush, and an overheat protection component is installed between each brush box and the brush holder base plate. The overheat protection component is connected to the starter control. The overheat protection component includes an insulating pad fixed to the brush holder base plate, a metal heat-conducting sheet fixed to the upper end of the insulating pad, and a temperature switch. The end of each electric brush is attached to one side wall of the metal heat-conducting sheet, and the temperature switch is placed inside the insulating pad, with its sensing surface attached to the other side wall of the metal heat-conducting sheet. When the temperature switch detects that the temperature of the electric brush reaches a preset first threshold, the temperature switch controls the starter to stop working.
[0009] In some embodiments, the insulating pad has a receiving cavity, the receiving cavity has a temperature sensing window facing the metal heat-conducting sheet, the temperature switch is placed in the receiving cavity, and the temperature sensing surface is placed in the temperature sensing window.
[0010] In some embodiments, a buffer pad is installed at the bottom of the receiving cavity, and the buffer pad is supported at the bottom of the temperature switch so that the temperature sensing surface is in close contact with the metal heat-conducting sheet.
[0011] In some embodiments, limit posts are symmetrically arranged on the buffer pad, and limit holes adapted to the limit posts are provided on the brush holder base plate.
[0012] In some embodiments, the brush box is U-shaped, with connecting ears on both sides. The connecting ears, the metal heat-conducting sheet, the insulating pad, and the brush holder base plate are riveted together and fixed by a plurality of rivets.
[0013] In some embodiments, the temperature switch has a connecting wire with a sealing plug installed on the connecting wire, the sealing plug being snapped onto the rear cover.
[0014] In some embodiments, the metal heat-conducting sheet is made of copper, and the buffer pad is made of rubber.
[0015] In some embodiments, the system further includes a stator assembly and a rotor assembly rotatably mounted within the stator assembly, wherein the brush holder base plate and the rear cover are located at the rear end of the stator assembly; the rear cover is fixedly connected to the housing of the stator assembly by a plurality of fastening screws.
[0016] In some embodiments, a relay and an electromagnetic switch are installed on the housing. The electromagnetic switch is used to control the starter motor to work or stop. The relay and the temperature switch cooperate to control the electromagnetic switch to close or open.
[0017] In some embodiments, when the temperature of the brush drops to a preset second threshold, the temperature switch controls the starter to start working.
[0018] (III) Beneficial Effects
[0019] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:
[0020] 1) An overheat protection component is installed at the brush location, where the starter motor generates the most heat and heats up the fastest. The overheat protection component is located between the brush box and the brush holder base plate. It uses a metal heat-conducting plate to transfer the heat of the brush to a temperature switch. When the temperature reaches a preset first threshold, the temperature switch controls the starter motor to stop working, preventing the insulation material from failing and the circuit from short-circuiting due to excessive brush temperature, which could burn out the starter motor. This effectively protects the starter motor, extends its service life, and reduces automotive maintenance costs. When the brush temperature drops to a preset second threshold, the temperature switch controls the starter motor to restart, ensuring that the starter motor can continue to be used after the temperature returns to normal, without affecting the normal starting needs of the vehicle. This improves the stability and convenience of starter motor use.
[0021] 2) The cavity inside the insulating pad provides installation space for the temperature switch, and the temperature sensing window faces the metal heat-conducting plate, allowing the temperature sensing surface of the temperature switch to more accurately sense the temperature transmitted by the metal heat-conducting plate, improving the timeliness and accuracy of temperature detection; the buffer pad at the bottom of the cavity supports the temperature switch, ensuring that its temperature sensing surface is in close contact with the metal heat-conducting plate, guaranteeing the high efficiency and stability of temperature transmission, further improving the reliability of temperature detection; it also provides buffer for the temperature switch, resulting in a stable structure and long service life.
[0022] 3) The difference between the first threshold and the second threshold can preferably be 20°C, so that the long recovery time caused by the high temperature of the installation environment will not affect the use, and the practicality is high. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a perspective view of the connection between the brush box, the overheat protection component, and the brush holder base plate in a starter structure with overheat protection according to this utility model.
[0025] Figure 2This is a perspective view of the connection between the brush box, overheat protection component and brush holder base plate in a starter structure with overheat protection according to this utility model.
[0026] Figure 3 This is a cross-sectional view of the overheat protection component in a starter structure with overheat protection according to this utility model;
[0027] Figure 4 This is an exploded view of the overheat protection component in a starter structure with overheat protection according to this utility model.
[0028] Figure 5 This is a perspective view of the connection between the insulating pad and the temperature switch in a starter structure with overheat protection according to this utility model.
[0029] Figure 6 This is a perspective view of the connection between the insulating pad, temperature switch and buffer pad in a starter structure with overheat protection according to this utility model.
[0030] Figure 7 This is a perspective view of the insulating pad in a starter structure with overheat protection according to this utility model;
[0031] Figure 8 This is a simplified schematic diagram of the circuit control structure of a starter motor with overheat protection according to this utility model;
[0032] The component names corresponding to the various labels in the figure are as follows: 1. Brush holder base plate; 101. Limiting hole; 2. Brush box; 201. Connecting ear; 3. Brush; 4. Overheat protection component; 41. Insulating pad; 411. Receiving cavity; 412. Temperature sensing window; 42. Metal heat-conducting plate; 43. Temperature switch; 431. Temperature sensing surface; 432. Connecting wire; 44. Buffer pad; 441. Limiting post; 5. Rivet; 6. Sealing plug; 7. Relay; 8. Electromagnetic switch; 9. Battery; 10. Main switch; 11. Vehicle switch; 12. Starter motor. Detailed Implementation
[0033] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0034] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0035] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.
[0036] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0037] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.
[0038] Combination Figures 1-8 As shown, this utility model provides a starter structure with overheat protection, including a brush holder base plate 1, several brush boxes 2 mounted on the brush holder base plate 1, and a rear cover (not shown in the figure) covering the brush boxes 2. The brush boxes 2 are equipped with electric brushes 3. There are four brush boxes 2, which are installed at intervals along the circumferential direction on the brush holder base plate 1.
[0039] See Figures 1 to 3An overheat protection component 4 is installed between any brush box 2 and the brush holder base plate 1. The overheat protection component 4 is connected to the starter motor control and is used to control the starter motor to stop working after it reaches a certain value, thereby protecting the starter motor. The overheat protection component 4 includes an insulating pad 41 fixed on the brush holder base plate 1, a metal heat-conducting sheet 42 fixed on the upper end of the insulating pad 41, and a temperature switch 43. The end of the brush 3 is attached to one side wall of the metal heat-conducting sheet 42. The temperature switch 43 is placed inside the insulating pad 41, and the temperature sensing surface 431 of the temperature switch 43 is attached to the other side wall of the metal heat-conducting sheet 42. When the temperature switch 43 detects that the temperature of the brush 3 reaches a preset first threshold, the temperature switch 43 controls the starter motor to stop working.
[0040] In this structure, an overheat protection component is installed at the brush position where the starter motor generates the most heat and heats up the fastest. The overheat protection component 4 is installed between the brush box 2 and the brush holder base plate 1. The heat of the brush 3 is transferred to the temperature switch 43 by the metal heat-conducting plate 42. When the temperature reaches the preset first threshold, the temperature switch 43 controls the starter motor to stop working, so as to avoid the failure of the insulation material and short circuit due to the excessive temperature of the brush, which would burn out the starter motor. This effectively protects the starter motor, extends its service life, and reduces the cost of automobile maintenance.
[0041] In some embodiments, such as Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, an insulating pad 41 has a receiving cavity 411, and a temperature sensing window 412 is opened in the receiving cavity 411 facing the metal heat-conducting plate 42. The temperature switch 43 is placed in the receiving cavity 411, and the temperature sensing surface 431 is placed in the temperature sensing window 412. In this structure, the receiving cavity 411 in the insulating pad 41 provides installation space for the temperature switch 43, and the temperature sensing window 412 facing the metal heat-conducting plate 42 allows the temperature sensing surface 431 of the temperature switch 43 to more accurately sense the temperature transmitted by the metal heat-conducting plate 42, thereby improving the accuracy of temperature detection.
[0042] In some embodiments, such as Figure 3 , Figure 4 and Figure 6As shown, a buffer pad 44 is installed at the bottom of the receiving cavity 411. The buffer pad 44 supports the bottom of the temperature switch 43, so that the sensing surface 431 is in close contact with the metal heat-conducting plate 42. In this structure, the buffer pad 44 at the bottom of the receiving cavity 411 supports the temperature switch 43, and its sensing surface 431 is in close contact with the metal heat-conducting plate 42, ensuring the high efficiency and stability of temperature transfer and further improving the reliability of temperature detection. Limiting posts 441 are symmetrically arranged on the buffer pad 44, and limiting holes 101 adapted to the limiting posts 441 are provided on the brush holder base plate 1. In this structure, the limiting posts 441 on the buffer pad 44 are adapted to the limiting holes 101 on the brush holder base plate 1, which facilitates the installation of the buffer pad 44 and ensures that the buffer pad 44 maintains an accurate position during operation.
[0043] In some embodiments, such as Figure 2 As shown, the brush box 2 is U-shaped, with connecting ears 201 on both sides. The connecting ears 201, the metal heat-conducting plate 42, the insulating pad 41, and the brush holder base plate 1 are riveted together and fixed by multiple rivets 5. This structure, using a riveting connection method, is easy to install and ensures a tight connection between the components. Even under vibration during starter operation, it can maintain the normal operation of the overheat protection components, thus improving the reliability of the starter.
[0044] In some embodiments, such as Figure 1 As shown, the temperature switch 43 has a connecting wire 432, and a sealing plug 6 is installed on the connecting wire 432. The sealing plug 6 is snapped onto the rear cover. In this structure, the sealing plug 6 on the connecting wire 432 of the temperature switch 43 is snapped onto the rear cover, which effectively prevents external dust, moisture and other substances from entering, protects the internal circuit, ensures the stable operation of the temperature switch 43, and also improves the overall protection performance of the starter.
[0045] In some embodiments, the metal heat-conducting sheet 42 is made of copper, and the buffer pad 44 is made of rubber. The metal heat-conducting sheet 42 is made of copper, which has good thermal conductivity and can quickly transfer the heat from the brush 3 to the temperature switch 43; the buffer pad 44 is made of rubber, which has good elasticity and cushioning performance, ensuring the contact between the temperature sensing surface 431 and the metal heat-conducting sheet 42, and also playing a certain role in shock absorption, thus extending the service life of the component.
[0046] In some embodiments, the system further includes a stator assembly and a rotor assembly rotatably mounted within the stator assembly. Both the stator assembly and the rotor assembly (not shown in the figure) are existing technologies and will not be described in detail in this embodiment. The brush holder base plate 1 and the rear cover are located at the rear end of the stator assembly; the rear cover is fixedly connected to the housing of the stator assembly by a plurality of fastening screws.
[0047] In some embodiments, such as Figure 8As shown, a relay 7 and an electromagnetic switch 8 are installed on the housing. The electromagnetic switch 8 is used to control the starter motor to work or stop. The relay 7 and the temperature switch 43 work together to control the electromagnetic switch 8 to close or open.
[0048] like Figure 8 As shown, the battery 9, main switch 10, and solenoid switch 8 are connected in series in the main circuit. Relay 7 is connected in series in the control circuit of solenoid switch 8. Temperature switch 43 and vehicle switch 11 are connected in series in the control circuit of relay 7. Under normal operating conditions, when main switch 10, vehicle switch 11, and temperature switch 43 are closed, relay 7 is closed, which in turn controls solenoid switch 8 to close, and starter 12 begins to work. When temperature switch 43 detects that the temperature of brush 3 reaches a preset first threshold, temperature switch 43 is opened, the control circuit of relay 7 is disconnected, relay 7 is disconnected, and the control circuit of solenoid switch 8 is disconnected, solenoid switch 8 is disconnected, and starter 12 stops working.
[0049] In some embodiments, when the temperature of the brush 3 drops to a preset second threshold, the temperature switch 43 controls the starter motor to start working. Both the first and second thresholds are fixed values and can be selected and set according to actual needs. This structure ensures that when the brush temperature drops to the second threshold, the temperature switch controls the starter motor to restart, guaranteeing that the starter motor can continue to be used after the temperature returns to normal, without affecting the normal starting needs of the vehicle, thus improving the convenience and stability of the starter motor. The difference between the first and second thresholds is preferably 20°C, avoiding the problem of long recovery time due to high ambient temperature affecting usability, thus demonstrating high practicality.
[0050] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the descriptions of the embodiments described later are relatively simple, and relevant parts can be referred to the descriptions of the foregoing embodiments.
[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A starter structure with overheat protection, comprising a brush holder base plate (1), a plurality of brush boxes (2) mounted on the brush holder base plate (1), and a rear cover covering the brush boxes (2), wherein brushes (3) are installed inside the brush boxes (2), characterized in that: An overheat protection component (4) is installed between any brush box (2) and the brush holder base plate (1), and the overheat protection component (4) is connected to the starter motor control. The overheat protection component (4) includes an insulating pad (41) fixed on the brush holder base plate (1), a metal heat-conducting sheet (42) fixed on the upper end of the insulating pad (41), and a temperature switch (43). The end of the brush (3) is attached to one side wall of the metal heat-conducting sheet (42), the temperature switch (43) is placed inside the insulating pad (41), and the temperature sensing surface (431) of the temperature switch (43) is attached to the other side wall of the metal heat-conducting sheet (42). When the temperature switch (43) detects that the temperature of the brush (3) reaches a preset first threshold, the temperature switch (43) controls the starter motor to stop working.
2. The starter structure with overheat protection according to claim 1, characterized in that: The insulating pad (41) has a receiving cavity (411) inside, and the receiving cavity (411) has a temperature sensing window (412) facing the metal heat-conducting sheet (42). The temperature switch (43) is placed inside the receiving cavity (411), and the temperature sensing surface (431) is placed inside the temperature sensing window (412).
3. The starter structure with overheat protection according to claim 2, characterized in that: A buffer pad (44) is installed at the bottom of the receiving cavity (411), and the buffer pad (44) is supported at the bottom of the temperature switch (43), so that the temperature sensing surface (431) is in close contact with the metal heat-conducting sheet (42).
4. The starter structure with overheat protection according to claim 3, characterized in that: The buffer pad (44) is symmetrically provided with limiting posts (441), and the brush holder base plate (1) is provided with limiting holes (101) that are adapted to the limiting posts (441).
5. The starter structure with overheat protection according to claim 1, characterized in that: The brush box (2) is U-shaped, with connecting ears (201) on both sides. The connecting ears (201), the metal heat-conducting sheet (42), the insulating pad (41) and the brush holder base plate (1) are riveted together by multiple rivets (5).
6. The starter structure with overheat protection according to claim 1, characterized in that: The temperature switch (43) has a connecting wire (432) on which a sealing plug (6) is installed, and the sealing plug (6) is snapped onto the rear cover.
7. The starter structure with overheat protection according to claim 3, characterized in that: The metal heat-conducting sheet (42) is made of copper, and the buffer pad (44) is made of rubber.
8. The starter structure with overheat protection according to claim 1, characterized in that: It also includes a stator assembly and a rotor assembly rotatably mounted within the stator assembly, wherein the brush holder base plate (1) and the rear cover are located at the rear end of the stator assembly; the rear cover is fixedly connected to the housing of the stator assembly by a plurality of fastening screws.
9. The starter structure with overheat protection according to claim 8, characterized in that: A relay (7) and an electromagnetic switch (8) are installed on the housing. The electromagnetic switch (8) is used to control the starter to work or stop. The relay (7) and the temperature switch (43) work together to control the electromagnetic switch (8) to close or open.
10. The starter structure with overheat protection according to claim 1, characterized in that: When the temperature of the brush (3) drops to a preset second threshold, the temperature switch (43) controls the starter to start working.