A starter structure with overheat protection

Abstract

The utility model provides a kind of starter structure with overheating protection, including brush holder bottom plate, several brush boxes being installed on brush holder bottom plate and cover being covered on brush box, brush box is equipped with brush, and overheating protection component is installed between any brush box and brush holder bottom plate, and overheating protection component is connected with starter control;Overheating protection component includes temperature switch being limitedly installed on brush holder bottom plate and metal heat-conducting sheet being located on the upside of temperature switch, and the end of brush is attached on the side wall surface of metal heat-conducting sheet, and the temperature sensing surface of temperature switch is attached on the other side wall surface of metal heat-conducting sheet;When the temperature of brush detected by temperature switch reaches preset first threshold value, temperature switch controls starter to stop working;The utility model provides a kind of starter structure with overheating protection, overcomes the defect that existing starter lacks overheating protection function and leads to starter easy to be damaged.

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 a temperature switch mounted on the brush holder base plate and a metal heat-conducting plate located above the temperature switch. The end of each electric brush is attached to one side wall of the metal heat-conducting plate, and the sensing surface of the temperature switch is attached to the other side wall of the metal heat-conducting plate. 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, a limiting ring is provided on the brush holder base plate, the temperature switch has a stepped structure, the stepped structure is limited between the limiting ring and the metal heat-conducting sheet, and a limiting through hole is provided in the limiting ring for the stepped structure to pass through.

[0010] In some embodiments, the stepped structure includes a first column and a second column, the diameter of the first column is smaller than the diameter of the second column, the first column passes through the limiting hole, the second column is placed on the upper side of the limiting ring, and the temperature sensing surface is disposed on the upper end surface of the second column.

[0011] In some embodiments, the overheat protection assembly further includes an insulating pad supported between the brush holder base plate and the metal heat-conducting sheet, wherein the insulating pad has a limiting through hole adapted to the second column.

[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, thereby causing the temperature switch, the metal heat-conducting sheet and the brush to be locked together.

[0013] In some embodiments, the metal heat-conducting sheet is made of copper.

[0014] 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.

[0015] 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.

[0016] In some embodiments, when the temperature of the brush drops to a preset second threshold, the temperature switch controls the starter to start working.

[0017] (III) Beneficial Effects

[0018] 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:

[0019] 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, and transfers the heat from the brush to the temperature switch through a metal heat-conducting plate. When the temperature reaches the preset first threshold, the temperature switch quickly controls the starter motor to stop working, avoiding problems such as insulation failure, short circuit, and burnout of the starter motor caused by brush overheating, effectively extending the service life of the starter motor and reducing vehicle maintenance costs. When the brush temperature drops to the preset second threshold, the temperature switch can control the starter motor to restart, ensuring that the vehicle can start normally under suitable conditions, improving the stability and convenience of starter motor use, and not affecting the normal operation of the vehicle.

[0020] 2) The limiting ring on the brush holder base plate cooperates with the stepped structure of the temperature switch. The first column passes through the limiting hole, and the second column is placed inside the insulating pad, realizing the precise limiting installation of the temperature switch. This allows it to maintain an accurate position and stably monitor the temperature even under the vibration environment of the starter motor. The insulating pad is supported between the brush holder base plate and the metal heat-conducting plate. Its internal limiting through hole is adapted to the second column of the temperature switch, which not only enhances the overall structural stability but also plays an insulating role, preventing current interference with the operation of the temperature switch and improving the reliability of the overheat protection component.

[0021] 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

[0022] 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.

[0023] Figure 1 This is a perspective view of the connection between the brush holder base plate, the overheat protection component, and the brush box in a starter structure with overheat protection according to this utility model.

[0024] Figure 2 This is a perspective view of the brush holder base plate, overheat protection component, and brush box connection of a starter structure with overheat protection according to this utility model.

[0025] Figure 3 This is a schematic diagram of the overheat protection component in a starter structure with overheat protection according to this utility model;

[0026] Figure 4 This is an exploded view of the overheat protection component in a starter structure with overheat protection according to this utility model.

[0027] Figure 5 This is a perspective view of the connection between the brush holder base plate and the temperature switch in a starter structure with overheat protection according to this utility model.

[0028] Figure 6 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 7 This is a simplified schematic diagram of the circuit control structure of a starter motor with overheat protection according to this utility model;

[0030] The component names corresponding to the various labels in the attached figures are as follows: 1. Brush holder base plate; 101. Limiting ring; 102. Limiting perforation; 2. Brush box; 201. Connecting ear; 3. Brush; 4. Overheat protection assembly; 41. Temperature switch; 411. Temperature sensing surface; 412. First column; 413. Second column; 42. Metal heat-conducting sheet; 43. Insulating pad; 431. Limiting through hole; 5. Rivet; 6. Relay; 7. Electromagnetic switch; 8. Battery; 9. Main switch; 10. Vehicle switch; 11. Starter motor. Detailed Implementation

[0031] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Combination Figures 1-7 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) covering the brush boxes 2. Brushes 3 are installed inside the brush boxes 2. There are four brush boxes 2, which are evenly spaced along the circumference on the brush holder base plate 1.

[0037] See Figures 1 to 3 An 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 when the starter motor temperature reaches a certain value, thereby protecting the starter motor. The overheat protection component 4 includes a temperature switch 41 that is limited and installed on the brush holder base plate 1 and a metal heat-conducting plate 42 located above the temperature switch 41. The end of the brush 3 is attached to one side wall of the metal heat-conducting plate 42, and the temperature sensing surface 411 of the temperature switch 41 is attached to the other side wall of the metal heat-conducting plate 42. When the temperature switch 41 detects that the temperature of the brush 3 reaches a preset first threshold, the temperature switch 41 controls the starter motor to stop working.

[0038] In this structure, an overheat protection component 4 is set between the brush box 2 and the brush holder base plate 1. The heat of the brush 3 is transferred to the temperature switch 41 through the metal heat conduction plate 42. When the temperature reaches the preset first threshold, the temperature switch 41 quickly controls the starter to stop working, avoiding problems such as insulation failure, short circuit and burnout of the starter caused by overheating of the brush, effectively extending the service life of the starter and reducing the cost of automobile maintenance.

[0039] In some embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, a limiting ring 101 is provided on the brush holder base plate 1. The temperature switch 41 has a stepped structure, which is limited between the limiting ring 101 and the metal heat-conducting plate 42. A limiting through hole 102 is provided in the limiting ring 101 for the stepped structure to pass through. The stepped structure includes a first column 412 and a second column 413 integrally connected. The diameter of the first column 412 is smaller than the diameter of the second column 413, so that the first column 412 can be inserted into the limiting through hole 102, while the second column 413 is placed on the upper side of the limiting ring 101. The temperature sensing surface 411 is provided on the upper end face of the second column 413. In this structure, the limiting ring 101 on the brush holder base plate 1 cooperates with the stepped structure of the temperature switch 41. The first column 412 passes through the limiting through hole 102, and the second column 413 is placed on the upper side of the limiting ring 101, so as to achieve precise limiting installation of the temperature switch 41, so that it can maintain an accurate position and stably monitor the temperature even under the vibration environment of the starter motor operation.

[0040] In some embodiments, such as Figures 2 to 4 as well as Figure 6 As shown, the overheat protection assembly 4 also includes an insulating pad 43 supported between the brush holder base plate 1 and the metal heat-conducting plate 42. The insulating pad 43 has a limiting through-hole 431 adapted to the second column 413. The second column 413 is placed within the limiting through-hole 431 to prevent the temperature switch 41 from moving. In this structure, the insulating pad 43 is supported between the brush holder base plate 1 and the metal heat-conducting plate 42, and its internal limiting through-hole 431 is adapted to the second column 413 of the temperature switch 41. This not only enhances the overall structural stability but also provides insulation, preventing current interference with the operation of the temperature switch 41 and improving the reliability of the overheat protection assembly.

[0041] In some embodiments, such as Figure 1 , Figure 2 and Figure 4As 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 43, and the brush holder base plate 1 are riveted together and fixed by multiple rivets 5, thereby ensuring that the temperature switch 41, the metal heat-conducting plate 42, and the brush 3 are locked together. In this structure, the connecting ears 201 on both sides of the brush box 2, the metal heat-conducting plate 42, the insulating pad 43, and the brush holder base plate 1 are riveted together and fixed together by rivets 5, ensuring that the temperature switch 41, the metal heat-conducting plate 42, and the brush 3 are tightly locked together, ensuring heat transfer efficiency and temperature detection accuracy, while improving the overall structural strength and adapting to the complex working environment of the starter motor.

[0042] In some embodiments, the metal heat-conducting plate 42 is made of copper. The copper material of the metal heat-conducting plate 42 utilizes its excellent thermal conductivity to quickly transfer the heat generated by the brush 3 to the temperature switch 41, ensuring the timeliness and accuracy of temperature detection.

[0043] In some embodiments, the system further includes a stator assembly and a rotor assembly (not shown) rotatably mounted within the stator assembly. Both the stator assembly and the rotor assembly are prior art 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, and the rear cover is fixedly connected to the housing of the stator assembly by a plurality of fastening screws.

[0044] In some embodiments, such as Figure 7 As shown, a relay 6 and an electromagnetic switch 7 are installed on the housing. The electromagnetic switch 7 is used to control the starter motor to work or stop. The relay 6 and the temperature switch 41 work together to control the opening and closing of the electromagnetic switch 7. In this structure, the relay 6 and the temperature switch 41 on the housing work together to control the opening and closing of the electromagnetic switch 7, forming a scientific and reasonable overheat protection control mechanism. It can respond to and control the starter motor's working state in a timely and accurate manner according to the temperature change of the brush 3, ensuring that the starter motor always operates within a safe temperature range, effectively guaranteeing the reliability and safety of the car starting system.

[0045] like Figure 7 As shown, the battery 8, main switch 9, and solenoid switch 7 are connected in series in the main circuit. Relay 6 is connected in series in the control circuit of solenoid switch 7. Temperature switch 41 and vehicle switch 10 are connected in series in the control circuit of relay 6. Under normal operating conditions, when main switch 9, vehicle switch 10, and temperature switch 41 are closed, relay 6 is closed, which in turn controls solenoid switch 7 to close, and starter 11 begins to work. When temperature switch 41 detects that the temperature of brush 3 reaches a preset first threshold, temperature switch 41 is opened, the control circuit of relay 6 is disconnected, relay 6 is disconnected, and the control circuit of solenoid switch 7 is disconnected, solenoid switch 7 is disconnected, and starter 11 stops working.

[0046] In some embodiments, when the temperature of the brush 3 drops to a preset second threshold, the temperature switch 41 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.

[0047] 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.

[0048] 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 a temperature switch (41) that is limited and installed on the brush holder base plate (1) and a metal heat-conducting plate (42) located on the upper side of the temperature switch (41). The end of the brush (3) is attached to one side wall of the metal heat-conducting plate (42), and the temperature sensing surface (411) of the temperature switch (41) is attached to the other side wall of the metal heat-conducting plate (42). When the temperature switch (41) detects that the temperature of the brush (3) reaches a preset first threshold, the temperature switch (41) controls the starter motor to stop working.

2. The starter structure with overheat protection according to claim 1, characterized in that: A limiting ring (101) is provided on the brush holder base plate (1). The temperature switch (41) has a stepped structure. The stepped structure is limited between the limiting ring (101) and the metal heat-conducting sheet (42). A limiting through hole (102) is provided in the limiting ring (101) for the stepped structure to pass through.

3. The starter structure with overheat protection according to claim 2, characterized in that: The stepped structure includes a first column (412) and a second column (413). The diameter of the first column (412) is smaller than the diameter of the second column (413). The first column (412) passes through the limiting hole (102). The second column (413) is placed on the upper side of the limiting ring (101). The temperature sensing surface (411) is disposed on the upper end face of the second column (413).

4. The starter structure with overheat protection according to claim 3, characterized in that: The overheat protection assembly (4) also includes an insulating pad (43) supported between the brush holder base plate (1) and the metal heat-conducting sheet (42), and the insulating pad (43) is provided with a limiting through hole (431) adapted to the second column (413).

5. The starter structure with overheat protection according to claim 4, characterized in that: The brush box (2) is U-shaped, with connecting ears (201) on both sides respectively; the connecting ears (201), the metal heat-conducting sheet (42), the insulating pad (43) and the brush holder base plate (1) are riveted and fixed by multiple rivets (5), so that the temperature switch (41), the metal heat-conducting sheet (42) and the brush (3) are locked together.

6. The starter structure with overheat protection according to claim 1, characterized in that: The metal heat-conducting sheet (42) is made of copper.

7. 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.

8. The starter structure with overheat protection according to claim 1, characterized in that: The housing is equipped with a relay (6) and an electromagnetic switch (7). The electromagnetic switch (7) is used to control the starter motor to work or stop. The relay (6) and the temperature switch (41) work together to control the electromagnetic switch (7) to close or open.

9. 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 (41) controls the starter to start working.

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