Safety structure for engine after starter short circuit

Abstract

The utility model provides a safety structure after starter short circuit for an engine, which comprises a casing, a stator coil assembly fixed on the inner wall of the casing and a binding post inserted on the casing, and the stator coil assembly comprises a gap bridge connecting line corresponding to the binding post. A fuse mounting part is arranged at one end, which is arranged in the casing, of the binding post, a fuse connecting plate is fixed on the fuse mounting part, the gap bridge connecting wire is fixedly connected with the fuse connecting plate, and the binding post is electrically connected with the gap bridge connecting wire through the fuse connecting plate. The melting point of the safety connecting plate is lower than that of the gap bridge connecting line and the binding post; during overload protection, the fuse connecting plate is fused, and the binding post is disconnected by the gap bridge connecting line; according to the safety structure after the starter for the engine is short-circuited, the defect that an existing starter is not safe to use after being short-circuited is overcome.

Description

Technical Field

[0001] This utility model relates to the field of engine starters, and in particular to a safety structure for engine starters after a short circuit. Background Technology

[0002] A starter motor converts electrical energy from a battery into mechanical energy, driving the engine flywheel to rotate and start the engine. An engine starter motor mainly consists of three parts: an electric motor, a transmission engagement mechanism (shift fork, one-way valve, and drive gear), and an electromagnetic switch. During operation, the electromagnetic switch pulls the shift fork to engage the drive gear with the engine flywheel ring gear, while simultaneously closing the switch contacts, energizing the DC motor and starting the engine.

[0003] The starter motor operates on a short-time duty cycle, requiring a very high current density in its design to meet performance requirements. However, unexpected customer actions, such as prolonged starting due to cold weather, engine malfunction, or exhaust fumes, can lead to overheating and short circuits. If the short circuit occurs and the grounding wire fails to disconnect, the high current continues to flow, potentially causing the starter motor to catch fire, or even the entire vehicle to burn down, posing a safety hazard. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The problem to be solved by this utility model is to provide a safety structure for a starter motor in case of a short circuit, so as to overcome the defect of existing starter motors that are unsafe to use after a short circuit.

[0006] (II) Technical Solution

[0007] To solve the aforementioned technical problem, this utility model provides a fuse structure for a starter motor after a short circuit, including a housing, a stator coil assembly fixed to the inner wall of the housing, and a terminal block inserted into the housing. The stator coil assembly includes a bridging wire corresponding to the terminal block. One end of the terminal block, which is inserted into the housing, is provided with a fuse mounting part. A fuse connecting plate is fixed to the fuse mounting part. The bridging wire is fixedly connected to the fuse connecting plate. The terminal block is electrically connected to the bridging wire through the fuse connecting plate. The melting point of the fuse connecting plate is lower than that of the bridging wire and the terminal block. In case of overload protection, the fuse connecting plate melts, and the bridging wire disconnects from the terminal block.

[0008] In some embodiments, the safety mounting portion is provided with a first boss and a second boss at intervals, and a mounting groove is formed between the first boss and the second boss, and the safety connecting plate is welded and fixed in the mounting groove.

[0009] In some embodiments, the bridging connecting line is C-shaped, and it is folded at the position corresponding to the safety connecting plate to form a connecting part, which is fitted into the safety connecting plate and welded to fix it.

[0010] In some embodiments, the safety connection plate includes a transition plate, one end of which is symmetrically and spaced apart by a first protrusion plate, and the other end of which is symmetrically and spaced apart by a second protrusion plate; the first protrusion plate and the second protrusion plate are opposite to each other and spaced apart, and form a receiving space between them for accommodating the bridge connection line.

[0011] In some embodiments, the terminal block includes a screw and a stepped platform disposed on the inner end of the screw, and the safety mounting part is disposed on the stepped platform; an inner insulating sleeve and an outer insulating sleeve are fitted on the screw, and the inner insulating sleeve and the outer insulating sleeve are respectively located on both sides of the housing; a fastening nut is threaded onto the screw, and when the fastening nut is tightened, the terminal block, the inner insulating sleeve, the outer insulating sleeve and the housing are locked together.

[0012] In some embodiments, a first sealing ring is installed between the inner insulating sleeve and the outer insulating sleeve; a spring washer and a flat washer are fitted on the screw, and the spring washer and the flat washer are located between the fastening nut and the outer insulating sleeve.

[0013] In some embodiments, the stator coil assembly further includes a plurality of magnets arranged in annular intervals on the inner wall of the housing and a stator coil arranged around the outer periphery of the magnets, one end of the stator coil being electrically connected to the bridge connecting line.

[0014] In some embodiments, the magnet is T-shaped and is fixedly connected to the housing by magnet fastening screws, and the stator coil is fixed to the inner wall of the housing by the magnet.

[0015] In some embodiments, insulating paper is installed on the inner wall of the housing at the position corresponding to the bridge connection line; second sealing rings are respectively installed at the upper and lower ends of the housing.

[0016] (III) Beneficial Effects

[0017] This utility model provides a safety structure for a starter motor after a short circuit. Utilizing the difference in melting points of the connecting materials in the circuit, a safety connecting plate is added between the terminal and the bridge connecting wire. The melting point of the safety connecting plate is lower than that of the terminal and the bridge connecting wire. When an internal short circuit occurs, the temperature rises, causing the safety connecting plate to melt and break, thus disconnecting the terminal and providing a safety function, improving safety in use. This overcomes the defect of existing starters that cause unsafe use after a short circuit. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a perspective view of a safety structure for a starter motor in an engine after a short circuit, according to the present invention.

[0020] Figure 2 This is an exploded view of a safety structure for a starter motor in an engine after a short circuit, according to this utility model.

[0021] Figure 3 This is a cross-sectional view of a safety structure for a starter motor in an engine according to the present invention after a short circuit;

[0022] Figure 4 This is a perspective view of the connection of the fuse terminal, fuse connection plate and bridge connection line of the fuse structure after a short circuit of the starter motor of an engine according to this utility model.

[0023] Figure 5 This is a perspective view of the connection between the terminal block and the fuse connection plate of a fuse structure after a short circuit in an engine starter according to this utility model.

[0024] Figure 6 This is a perspective view of the connection between the safety connecting plate and the bridge connecting line of the safety structure after a short circuit in the starter motor of an engine according to this utility model.

[0025] Figure 7 This is a perspective view of a safety connection plate, a safety structure for an engine starter after a short circuit, according to the present invention.

[0026] Figure 8 This is an exploded view of the stator coil assembly of a safety structure for a starter motor in an engine, according to the present invention.

[0027] The component names corresponding to the various reference numerals in the figure are as follows: 1. Housing; 2. Stator coil assembly; 21. Bridge connecting wire; 22. Magnet; 23. Stator coil; 24. Magnet fastening screw; 211. Connecting part; 3. Terminal post; 301. Fuse mounting part; 302. First boss; 303. Second boss; 304. Mounting groove; 305. Screw; 306. Stepped platform; 4. Fuse connecting plate; 401. Transition plate; 402. First protruding plate; 403. Second protruding plate; 404. Accommodating space; 5. Inner insulating sleeve; 6. Outer insulating sleeve; 7. Fastening nut; 8. First sealing ring; 9. Spring washer; 10. Flat washer; 11. Insulating paper; 12. Second sealing ring. Detailed Implementation

[0028] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0034] See Figures 1 to 8This utility model provides a fuse structure for a starter motor in case of a short circuit, including a cylindrical housing 1, a stator coil assembly 2 fixed to the inner wall of the housing 1, and terminals 3 inserted into the housing 1. The terminals 3 are made of conductive metal to allow current flow. The terminals 3 are arranged perpendicularly to the housing 1, with one part inside the housing 1 and the other part outside. The stator coil assembly 2 includes a bridging wire 21 corresponding to the terminals 3, which can be made of copper wire. A fuse mounting part 301 is provided at one end of the terminals 3 inside the housing 1. A fuse connecting plate 4 is fixed to the fuse mounting part 301. The bridging wire 21 is fixedly connected to the fuse connecting plate 4, and the terminals 3 are electrically connected to the bridging wire 21 through the fuse connecting plate 4. To achieve the fuse function, the melting point of the fuse connecting plate 4 is lower than that of the bridging wire 21 and the terminals 3; for example, the fuse connecting plate 4 can be made of a lead-antimony alloy. In case of overload protection, the fuse connection plate 4 melts due to the increased temperature, thereby disconnecting the bridge connection line 21 from the terminal 3. This structure, by adding a fuse connection plate 4 between the terminal 3 and the bridge connection line 21, allows the fuse connection plate 4 to melt due to the increased temperature during an internal short circuit, thus disconnecting the bridge connection line 21 from the terminal 3 and providing a safety function, improving operational safety.

[0035] In some embodiments, such as Figure 4 and Figure 5 As shown, the safety mounting section 301 has a first boss 302 and a second boss 303 spaced apart. The first boss 302 and the second boss 303 have different thicknesses to facilitate the installation and welding of the safety connecting plate 4. A mounting groove 304 is formed between the first boss 302 and the second boss 303, and the safety connecting plate 4 is fixed in the mounting groove 304 by soldering.

[0036] In some embodiments, such as Figure 4 and Figure 6 As shown, the bridging connector 21 is C-shaped. At the position corresponding to the safety connector 4, the bridging connector 21 is folded to form a connecting portion 211. The connecting portion 211 is fitted inside the safety connector 4 and fixed by solder wire. This structure, with the connecting portion 211, facilitates the welding of the safety connector 4 and the bridging connector 21.

[0037] In some embodiments, such as Figures 5 to 7As shown, the safety connection plate 4 includes a transition plate 401. One end of the transition plate 401 has symmetrically spaced first protruding plates 402, and the other end has symmetrically spaced second protruding plates 403. The first protruding plates 402 and 403 are arranged perpendicular to the transition plate 401. The first protruding plates 402 and 403 are opposite to each other and spaced apart, forming a receiving space 404 between them for accommodating the bridge connecting line 21. After the connecting part 211 is installed, the first protruding plate 402 abuts against one end of the connecting part 211, and the second protruding plate 403 abuts against the other end of the connecting part 211, resulting in a stable and reliable connection with good conductivity.

[0038] In some embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, the terminal 3 includes a screw 305 and a stepped platform 306 disposed on the inner end of the screw 305. The outer diameter of the stepped platform 306 is larger than that of the screw 305, and the safety mounting part 301 is disposed on the stepped platform 306. An inner insulating sleeve 5 and an outer insulating sleeve 6 are fitted on the screw 305, and the inner insulating sleeve 5 and the outer insulating sleeve 6 are respectively located on both sides of the housing 1. A fastening nut 7 is threaded onto the screw 305. When the fastening nut 7 is tightened, the terminal 3, the inner insulating sleeve 5, the outer insulating sleeve 6 and the housing 1 are locked together. A first sealing ring 8 is installed between the inner insulating sleeve 5 and the outer insulating sleeve 6 to ensure sealing performance. A spring washer 9 and a flat washer 10 are fitted on the screw 305, and the spring washer 9 and the flat washer 10 are located between the fastening nut 7 and the outer insulating sleeve 6.

[0039] In some embodiments, such as Figure 3 , Figure 4 and Figure 8 As shown, the stator coil assembly 2 also includes multiple annularly spaced magnets 22 arranged on the inner wall of the housing 1, and stator coils 23 arranged around the outer periphery of the magnets 22. In this embodiment, there are four magnets 22, and one end of the stator coil 23 is electrically connected to the bridge connecting line 21. The magnets 22 are T-shaped to facilitate fixing the stator coils 23. The magnets 22 are fixedly connected to the housing 1 by magnet fastening screws 24, and the stator coils 23 are fixed to the housing 1 by the magnets 22.

[0040] In some embodiments, such as Figure 2 and Figure 3 As shown, insulating paper 11 is installed on the inner wall of the housing 1 at the position corresponding to the bridge connection line 21; second sealing rings 12 are installed at the upper and lower ends of the housing 1 respectively.

[0041] During assembly, first install the terminal block 3, then fix the fuse connection plate 4 inside the terminal block 3; then fix the stator coil 23 inside the housing 1 through the magnet 22, and finally install the bridge connection wire 21 on the fuse connection plate 4 and solder it.

[0042] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0043] 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 safety structure for a starter motor in case of a short circuit, characterized in that: The device includes a housing (1), a stator coil assembly (2) fixed on the inner wall of the housing (1), and terminals (3) inserted into the housing (1). The stator coil assembly (2) includes a bridging wire (21) corresponding to the terminals (3). One end of the terminals (3) inserted into the housing (1) is provided with a fuse mounting part (301). A fuse mounting part (301) is fixed on the fuse mounting part (301). The bridging wire (21) is fixedly connected to the fuse mounting part (4). The terminals (3) are electrically connected to the bridging wire (21) through the fuse mounting part (4). The melting point of the fuse mounting part (4) is lower than that of the bridging wire (21) and the terminals (3). When overload protection occurs, the fuse mounting part (4) melts and the bridging wire (21) disconnects from the terminals (3).

2. The safety structure for short circuit of the engine starter as described in claim 1, characterized in that: The safety mounting part (301) is provided with a first boss (302) and a second boss (303) spaced apart. An installation groove (304) is formed between the first boss (302) and the second boss (303). The safety connecting plate (4) is welded and fixed in the installation groove (304).

3. The safety structure for short circuit of the engine starter as described in claim 1, characterized in that: The bridge connecting line (21) is C-shaped, and it is folded at the position corresponding to the safety connecting plate (4) to form a connecting part (211). The connecting part (211) is fitted into the safety connecting plate (4) and welded and fixed.

4. The safety structure for short circuit of the engine starter as described in claim 1, characterized in that: The safety connection plate (4) includes a transition plate (401). One end of the transition plate (401) is symmetrically and spaced apart by a first protrusion plate (402), and the other end of the transition plate (401) is symmetrically and spaced apart by a second protrusion plate (403). The first protrusion plate (402) and the second protrusion plate (403) are opposite to each other and spaced apart, and form a receiving space (404) between them for accommodating the bridge connection line (21).

5. The safety structure for short circuit of the engine starter as described in claim 1, characterized in that: The terminal block (3) includes a screw (305) and a stepped platform (306) disposed on the inner end of the screw (305). The safety mounting part (301) is disposed on the stepped platform (306). An inner insulating sleeve (5) and an outer insulating sleeve (6) are fitted on the screw (305). The inner insulating sleeve (5) and the outer insulating sleeve (6) are respectively located on both sides of the housing (1). A fastening nut (7) is threaded onto the screw (305). After the fastening nut (7) is tightened, the terminal block (3), the inner insulating sleeve (5), the outer insulating sleeve (6) and the housing (1) are locked together.

6. The safety structure for short circuit of the engine starter as described in claim 5, characterized in that: A first sealing ring (8) is installed between the inner insulating sleeve (5) and the outer insulating sleeve (6); a spring washer (9) and a flat washer (10) are fitted on the screw (305), and the spring washer (9) and the flat washer (10) are located between the fastening nut (7) and the outer insulating sleeve (6).

7. The safety structure for short circuit of the engine starter as described in claim 1, characterized in that: The stator coil assembly (2) also includes a plurality of magnets (22) arranged in annular intervals on the inner wall of the housing (1) and stator coils (23) arranged around the outer periphery of the magnets (22), one end of the stator coils (23) being electrically connected to the bridge connecting line (21).

8. The safety structure for short circuit of the engine starter as described in claim 7, characterized in that: The magnet (22) is T-shaped and is fixedly connected to the housing (1) by magnet fastening screws (24). The stator coil (23) is fixed to the inner wall of the housing (1) by the magnet (22).

9. The safety structure for short circuit of the starter motor for an engine as described in claim 1, characterized in that: Insulating paper (11) is installed on the inner wall of the housing (1) at the position corresponding to the bridge connection line (21).

10. The safety structure for short circuit of the starter motor for an engine as described in claim 1, characterized in that: The upper and lower ends of the housing (1) are respectively equipped with second sealing rings (12).

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