Electromagnetic switch and starter with the same

Abstract

An electromagnetic switch and a starter having the electromagnetic switch, the electromagnetic switch comprising: a body connected to the main body of the starter; a plunger mechanism installed in the body, comprising a plunger and a moving contact piece installed at the end of the plunger; a support cover mechanism comprising a support cover and a battery terminal and a motor terminal installed on the support cover, the support cover being connected to the body to form a accommodating space, the moving contact piece being located in the accommodating space, the bottom ends of the battery terminals and the bottom ends of the motor terminals being respectively arranged in the accommodating space corresponding to the moving contact piece; and an arc extinguishing mechanism being located in the accommodating space and arranged corresponding to the contact areas between the battery terminals and the motor terminals and the moving contact piece. The present invention also discloses a starter having the above-mentioned electromagnetic switch. The present invention can effectively reduce contact failures of the electromagnetic switch and ensure safe and reliable operation of the starter.

Description

Technical Field

[0001] The present invention relates to a starter, in particular to an electromagnetic switch capable of effectively reducing contact failures and a starter having the electromagnetic switch. Background Art

[0002] The electromagnetic switch is the control switch on the starter and is one of the three major components of the starter (DC motor, transmission engagement mechanism, and electromagnetic switch). Its working principle is that when the coil is energized, it generates electromagnetic attraction, causing the movable iron core to move, thereby pulling the transmission engagement mechanism to move the starter pinion forward and engage with the engine flywheel ring gear. On the other hand, it pushes the switch moving contact to connect with the terminal, so that the DC motor is energized and running, thereby driving the engine to start.

[0003] At the moment of contact, unlike ordinary contact switches that only form a pair of contact electrodes (anode-cathode) when in contact, a pair of contact electrodes (anode-cathode) is formed between the starter battery terminal and the switch moving contact piece, and a pair of contact electrodes (anode-cathode) is also formed between the switch moving contact piece and the motor terminal. In addition, the contact structures between the starter switch moving contact piece and the terminals are also diverse. For example, there are the contact structures of a strip-shaped moving contact piece (the contact surface is a flat surface) and a square terminal (the contact surface is a square flat surface or a square corrugated surface); the contact structures of a strip-shaped moving contact piece (the contact surface is a flat surface) and a circular terminal (the contact surface is a circular flat surface or a circular corrugated surface); the contact structures of a disc-shaped moving contact piece and a square terminal (the contact surface is a square flat surface or a square corrugated surface); the contact structures of a disc-shaped moving contact piece and a polygonal terminal (generally hexagonal, with a polygonal flat surface or a polygonal corrugated surface); and the contact structures of a partially spherical moving contact piece and a concave spherical arc terminal, etc.

[0004] Like conventional contact switches, starter electromagnetic switches experience contact failure primarily through welding and ablation, caused by arcing during the circuit connection and disconnection process. The two pairs of contact electrodes formed by the starter electromagnetic switch increase the probability of failure, especially after a period of use, when the contact surface condition deteriorates and the contact resistance increases, further increasing the likelihood of contact failure.

[0005] In addition, facing increasingly harsh operating environments, higher requirements are being placed on the protective performance of the starter. To meet the requirements for improved starter protection, the original drainage and exhaust facilities of the starter have been eliminated, that is, the starter has become fully sealed. For starters with high sealing levels, the seal at the switch support cover far exceeds the national standard IPX7, and the sealing test can reach above 6psi. Due to the presence of harmful gases and moisture in the closed cavity formed inside the starter, the contacts of the electromagnetic switch are susceptible to oxidation and electrical corrosion, etc., which increases the contact resistance of the switch contacts at the moment of closing, thereby intensifying contact arcing, causing increased contact wear, and ultimately leading to severe contact erosion, preventing the switch from closing normally and causing starter failure. In addition, as the arcing of the contacts intensifies, the arcing heat also increases. At the same time, the heat inside the sealed starter is not easy to be released. First, the support cover is easily damaged by high temperature. Second, liquid metal bridges are more likely to be generated between the contacts due to high temperature. The scattered particles after melting will continue to adhere to the inner wall of the support cover. In severe cases, conductors may be formed, causing the starter battery terminals and motor terminals to be connected, resulting in the starter motor burning. In severe cases, open flames may be ignited and cause a fire. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an electromagnetic switch and a starter having the electromagnetic switch in view of the above-mentioned defects of the prior art.

[0007] In order to achieve the above object, the present invention provides an electromagnetic switch for a starter, which includes:

[0008] The body is connected to the starter motor;

[0009] A plunger mechanism is installed in the body and includes a plunger and a movable contact piece installed at the end of the plunger;

[0010] a support cover mechanism, comprising a support cover and battery terminals and motor terminals mounted on the support cover, wherein the support cover is connected to the body to enclose an accommodation space, the movable contact piece is located within the accommodation space, and the bottom ends of the battery terminals and the bottom ends of the motor terminals are respectively arranged within the accommodation space corresponding to the movable contact pieces; and

[0011] The arc extinguishing mechanism is located in the accommodating space and is provided corresponding to the contact area between the battery terminal, the motor terminal and the moving contact piece.

[0012] The electromagnetic switch of the above-mentioned starter, wherein the arc extinguishing mechanism includes a first high-pressure relief valve and a second high-pressure relief valve, the first high-pressure relief valve and the second high-pressure relief valve are respectively located on both sides of the moving contact piece, the first high-pressure relief valve is close to the contact electrode formed by the battery terminal and the moving contact piece, and the second high-pressure relief valve is close to the contact electrode formed by the motor terminal and the moving contact piece, the air intake sides of the first high-pressure relief valve and the second high-pressure relief valve are connected to the accommodating space, and the air outlet sides of the first high-pressure relief valve and the second high-pressure relief valve are connected to the atmosphere outside the starter.

[0013] The electromagnetic switch of the starter mentioned above, wherein the first high-pressure relief valve and the second high-pressure relief valve are respectively pre-buried in the support cover, or respectively plugged into the support cover, or respectively connected to the outside of the support cover through threads.

[0014] In the electromagnetic switch of the starter motor, the inner wall of the support cover is coated. When the support cover is subjected to abnormally high temperature, the coating produces a chemical reaction to reduce the damage to the support cover and the terminal caused by the high temperature.

[0015] The above-mentioned electromagnetic switch of the starter, wherein the arc extinguishing mechanism includes a first magnetic pole and a second magnetic pole with opposite polarities, the first magnetic pole and the second magnetic pole are respectively located on both sides of the moving contact piece, the first magnetic pole is close to the first contact electrode formed by the battery terminal and the moving contact piece, and the second magnetic pole is close to the second contact electrode formed by the motor terminal and the moving contact piece.

[0016] The above-mentioned electromagnetic switch of the starter, wherein the arc extinguishing mechanism also includes a first magnetic metal sheet and a second magnetic metal sheet, the first magnetic metal sheet is arranged on one side of the moving contact piece corresponding to the first magnetic pole; the second magnetic metal sheet is arranged on the other side of the moving contact piece corresponding to the second magnetic pole, and the polarity of the first magnetic pole and the second magnetic pole close to the side of the moving contact piece is the same.

[0017] In the electromagnetic switch of the starter motor, the first magnetic pole and the second magnetic pole are both permanent magnet structures, and a groove lower than the inner wall of the support cover is provided in the accommodating space.

[0018] The above-mentioned electromagnetic switch of the starter, wherein the first magnetic pole and the second magnetic pole are both electromagnets, the electromagnets include an electromagnet core and an electromagnetic coil, the electromagnetic coil is connected to the battery terminal through a delayed disconnection relay, and a metal particle recovery tank is provided in the accommodating space corresponding to the bottom of the electromagnet.

[0019] The above-mentioned electromagnetic switch of the starter, wherein the electromagnetic coils of the first magnetic pole and the second magnetic pole are connected to the control end of the control relay of the starter through the delayed disconnection relay, the output ends of the electromagnetic coils of the first magnetic pole and the second magnetic pole are grounded, and the winding directions of the electromagnetic coils of the first magnetic pole and the second magnetic pole are the same.

[0020] The electromagnetic switch of the above-mentioned starter, wherein the first magnetic pole, the second magnetic pole, the first magnetic metal sheet and the second magnetic metal sheet are respectively pre-embedded in the support cover, or respectively plugged into the support cover, or respectively fixed to the outside of the support cover by threaded connection or bonding.

[0021] The electromagnetic switch of the above-mentioned starter, wherein the arc extinguishing mechanism is a capacitor parallel to both sides of the line connecting the battery terminal and the motor terminal; or a capacitor perpendicular to both sides of the line connecting the battery terminal and the motor terminal, one side plate of the capacitor is connected to the battery terminal, and the other side plate of the capacitor is grounded through the body.

[0022] In order to better achieve the above-mentioned purpose, the present invention also provides a starter, which includes the above-mentioned electromagnetic switch.

[0023] The technical effects of the present invention are:

[0024] The electromagnetic switch of the present invention is provided with a high-pressure relief valve on the contact electrode formed by the moving contact piece and the battery terminal and on the opposite side of the contact electrode formed by the moving contact piece and the battery terminal. High temperature is generated at the moment of contact arcing, and the high temperature causes the air pressure inside the starter to increase, especially the air pressure in the support cover accommodating space will increase rapidly. When the air pressure rises to the threshold value of the high-pressure relief valve, the high-pressure relief valve opens to release air. At the moment of release, the gas carrying the arc plasma is blown to the external space through the through hole of the relief valve, and the temperature in the support cover accommodating space also drops at the same time, achieving the arc extinguishing effect. In an electromagnetic switch according to another embodiment of the present invention, a magnetic pole is respectively provided on the contact electrode formed by the moving contact piece and the battery terminal and on the opposite side of the contact electrode formed by the moving contact piece and the battery terminal. The magnetic attraction force of the magnetic pole can lengthen the arc length of the electrode during the closing or opening process under the same electrode gap, so that the arc column can be cooled rapidly, the arc heat can be reduced, and the occurrence of welding can be reduced; at the same time, even if a liquid metal bridge is generated between the contacts, the particles scattered after the charged metal bridge melts can also move toward the magnetic pole side under the action of the magnetic attraction force. Since the magnetic poles are provided on the opposite side, metal particles are prevented from adhering to one side of the inner wall of the support cover to cause conduction between the battery terminal and the motor terminal.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is a schematic diagram of the starter structure according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the starter and electromagnetic switch structure according to an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the starter and electromagnetic switch structure according to another embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of an arc extinguishing structure according to an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of an arc extinguishing structure according to another embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of an arc extinguishing structure according to another embodiment of the present invention;

[0032] Figure 7 FIG. 1 is a circuit diagram of a starter according to an embodiment of the present invention.

[0033] Among them, the reference numerals

[0034] 1 motor

[0035] 2 electromagnetic switches

[0036] 21 units

[0037] 22 plunger mechanism

[0038] 221 plunger

[0039] 222 dynamic contact piece

[0040] 23 Support cover mechanism

[0041] 231 support cover

[0042] 232 battery terminals

[0043] 233 motor terminal

[0044] 24 arc extinguishing mechanism

[0045] 241 first magnetic pole

[0046] 242 second magnetic pole

[0047] 243 first magnetic metal sheet

[0048] 244 second magnetic metal sheet

[0049] 245 capacitor

[0050] 246 first high-pressure relief valve

[0051] 247 Second high-pressure relief valve

[0052] 3 control relay

[0053] 4 Delayed disconnect relay

[0054] 5 switch terminals DETAILED DESCRIPTION

[0055] The structural principle and working principle of the present invention are described in detail below with reference to the accompanying drawings:

[0056] See also Figure 1 , Figure 1 This is a schematic diagram of the starter structure according to one embodiment of the present invention. The starter comprises a motor 1, a transmission engagement mechanism, and an electromagnetic switch 2. The electromagnetic switch 2 effectively reduces contact failures. The composition, structure, relative positions, connections, and operating principles of the other components of the starter are well-established in the prior art. The following describes only the electromagnetic switch 2 in detail.

[0057] See also Figure 2 , Figure 2 The figure is a schematic diagram of the structure of a starter and electromagnetic switch 2 according to an embodiment of the present invention. The electromagnetic switch 2 of the present invention comprises: a body 21 connected to the starter motor 1; a plunger mechanism 22 mounted within the body 21, comprising a plunger 221 and a movable contact piece 222 fixed to the end of the plunger 221; a support cover mechanism 23 comprising a support cover 231 and a battery terminal 232 and a motor terminal 233 mounted on the support cover 231. The support cover 231 is connected to the body 21 to form an accommodating space. The movable contact piece 222 is located within the accommodating space. The bottom ends of the battery terminal 232 and the bottom ends of the motor terminal 233 are respectively arranged in the accommodating space corresponding to the movable contact piece 222; and an arc extinguishing mechanism 24 located within the accommodating space and arranged corresponding to the contact areas between the battery terminal 232 and the motor terminal 233 and the movable contact piece 222. After the coil inside the body 21 is energized, an electromagnetic force is generated on the plunger 221 to push the moving contact piece 222 to connect with the battery terminal 232 and the motor terminal 233 at the same time. At the moment when the moving contact piece 222 is closed and separated from the battery terminal 232 and the motor terminal 233, an arc will be formed, and the arc extinguishing mechanism 24 is used to prolong the arc.

[0058] In this embodiment, the arc extinguishing mechanism 24 includes a first magnetic pole 241 and a second magnetic pole 242 of opposite polarity. The first magnetic pole 241 and the second magnetic pole 242 are located on either side of the movable contact piece 222, with the first magnetic pole 241 being located near the first contact electrode formed by the battery terminal 232 and the movable contact piece 222, and the second magnetic pole 242 being located near the second contact electrode formed by the motor terminal 233 and the movable contact piece 222. The magnetic attraction between the first and second magnetic poles 241 and 242 can extend the arc length during the closing or opening process at the same electrode gap, rapidly cooling the arc column, reducing arc heat, and minimizing the occurrence of welding. Furthermore, even if a liquid metal bridge forms between the contacts, the particles scattered after the charged metal bridge melts can be moved toward the first and second magnetic poles 241 and 242 under the influence of the magnetic attraction. Because they are located on opposite sides, metal particles are prevented from adhering to the inner wall of the support cover 231, thereby preventing electrical conduction between the battery terminal 232 and the motor terminal 233.

[0059] See also Figure 3 , Figure 3 The diagram below is a schematic diagram of the starter and electromagnetic switch structure according to another embodiment of the present invention. In this embodiment, the arc extinguishing mechanism includes a first high-pressure relief valve 246 and a second high-pressure relief valve 247, respectively located on either side of the movable contact piece 222. The first high-pressure relief valve 246 is located near the contact electrode formed by the battery terminal 232 and the movable contact piece 222, while the second high-pressure relief valve 247 is located near the contact electrode formed by the motor terminal 233 and the movable contact piece 222. The air intakes of the first and second high-pressure relief valves 246 and 247 communicate with the accommodating space, while their air outlets communicate with the atmosphere outside the starter. The first and second high-pressure relief valves 246 and 247 can be pre-buried within the support cover 231, plugged into the support cover 231, or threadedly attached to the outside of the support cover 231. During operation, high temperature is generated at the moment when the contacts arc, and the high temperature causes the air pressure inside the starter to increase, especially the air pressure in the accommodating space of the support cover 231 will increase rapidly. When the air pressure rises to the threshold value of the first high-pressure relief valve 246 and the second high-pressure relief valve 247, the first high-pressure relief valve 246 and the second high-pressure relief valve 247 are opened to relieve air. At the moment of relief, the gas carrying the arc plasma is blown to the external space through the through holes of the first high-pressure relief valve 246 and the second high-pressure relief valve 247, and the temperature in the accommodating space of the support cover 231 also drops at the same time, achieving the arc extinguishing effect.

[0060] See also Figure 4 , Figure 4The figure is a schematic diagram of the arc extinguishing structure of an embodiment of the present invention. In this embodiment, the arc extinguishing mechanism 24 further includes a first magnetic metal sheet 243 and a second magnetic metal sheet 244, which make the magnetic flux lines of the first magnetic pole 241 and the second magnetic pole 242 more densely distributed, thereby increasing the magnetic attraction at the contact electrode. The first magnetic metal sheet 243 is arranged on one side of the movable contact piece 222 corresponding to the first magnetic pole 241; the second magnetic metal sheet 244 is arranged on the other side of the movable contact piece 222 corresponding to the second magnetic pole 242. The polarity of the first magnetic pole 241 and the second magnetic pole 242 on the side closest to the movable contact piece 222 is the same. The metal sheet is magnetic, that is, it can attract the magnetic pole and has no polarity. To prevent the mutual attraction between the two magnets, which may cause a decrease in the magnetic field density at the terminal, the polarity of the two magnetic poles on the side closest to the terminal and the movable contact piece should be the same.

[0061] Among them, the first magnetic pole 241 and the second magnetic pole 242 can both be permanent magnet structures, that is, a permanent magnet pole is set on both sides of the contact area between the battery terminal 232 and the motor terminal 233 and the moving contact piece 222 on the support cover 231, and a groove is set in the accommodating space that is lower than the inner wall of the support cover 231 to prevent the copper powder adsorbed by the magnetic pole from easily scattering downward. Among them, the first magnetic pole 241, the second magnetic pole 242, the first magnetic metal sheet 243 and the second magnetic metal sheet 244 can be pre-embedded in the support cover 231 respectively, or plugged into the support cover 231 respectively, or fixed to the outside of the support cover 231 respectively by threaded connection or bonding. The inner wall of the support cover 231 is coated, and the coating produces a chemical reaction when the support cover 231 is subjected to abnormally high temperature to reduce the damage of the high temperature to the support cover 231 and the terminals. See Figure 5 , Figure 5This is a schematic diagram of an arc extinguishing structure according to another embodiment of the present invention. Both the first magnetic pole 241 and the second magnetic pole 242 can be electromagnets. The electromagnet comprises an electromagnet core and an electromagnetic coil, which is connected to the battery terminal 232 via a time-delayed disconnect relay 4. A metal particle recovery tank is provided within the housing space below the electromagnet. In this embodiment, the electromagnetic coils comprise four coils. The input terminals of each coil are connected to the control terminal of the starter's control relay 3 via the time-delayed disconnect relay 4. The output terminals of each coil are grounded, and all four coils have the same winding direction. During starter operation, the starter's control relay 3 and the time-delayed disconnect relay are simultaneously energized and closed, and the electromagnetic switch 2 coil and the magnetic pole coil are simultaneously energized. The electromagnet generates a magnetic field, closing the switch contacts between the battery terminal 232 and the motor terminal 233 and the movable contact 222. After the starter operation is complete and the starter's control relay 3 is de-energized, the time-delayed disconnect relay 4 delays its opening, ensuring that the magnetic pole coil is de-energized after the starter's switch contacts open. At the same time, a metal particle recovery tank is provided below the electromagnet inside the support cover to prevent the adsorbed copper powder from scattering everywhere when power is turned on.

[0062] See also Figure 6 , Figure 6 This figure illustrates an arc extinguishing structure according to another embodiment of the present invention. The arc extinguishing mechanism 24 in this embodiment comprises capacitors 245 positioned parallel to the line connecting the battery terminal 232 and the motor terminal 233 (this structure can extinguish the arc, but cannot prevent copper powder generated after welding from accumulating on the inner wall of the support cover 231, causing the terminals to conduct). Alternatively, the capacitors 245 can be positioned perpendicular to the line connecting the battery terminal 232 and the motor terminal 233 (in this structure, the electric field strength generated between the capacitors 245 is reduced because the movable contact 222 is longer than its width, but it can prevent copper powder generated after welding from accumulating on the inner wall of the support cover 231, causing the terminals to conduct). One side plate of the capacitor 245 is connected to the battery terminal 232, and the other side plate of the capacitor 245 is grounded through the engine body 21. When the starter is connected to the battery, the capacitor 245 charges, generating an electric field between the capacitor plates 245 and within the inner cavity of the support cover 231, i.e., the accommodating space. The electric field force exerted by the arc electrons in this electric field causes the arc to lengthen, thus extinguishing the arc.

[0063] See also Figure 7 , Figure 7The following is a circuit diagram of a starter according to an embodiment of the present invention. The electromagnetic switch 2 of the present invention is provided with two pairs of magnetic poles on both sides of the moving contact piece 222, the battery terminal 232, and the motor terminal 233. The magnetic poles on the same side have the same polarity, while the two magnetic poles on the other side have opposite polarity. The magnetic pole area covers the contact area between the moving contact piece 222 and the static contact. The magnetic poles can be permanent magnets or electromagnets. When the starter is operating, the starter control relay 3 and the delayed disconnect relay 4 of the magnetic pole coil are energized and closed simultaneously. The electromagnetic switch 2 coil and the magnetic pole coil of the arc extinguishing mechanism 24 are energized simultaneously. The electromagnet of the arc extinguishing mechanism 24 generates a magnetic field, and the switch contacts are closed. After the starter is completed, the starter control relay 3 is de-energized, and the delayed disconnect relay 4 of the arc extinguishing magnetic pole is delayed to disconnect, ensuring that the arc extinguishing magnetic pole coil is de-energized after the starter switch terminal 5 contacts are opened.

[0064] The electromagnetic switch 2 of the present invention is provided with a magnetic pole on the contact electrode formed by the moving contact piece 222 and the battery terminal 232 and on the opposite side of the contact electrode formed by the moving contact piece 222 and the battery terminal 232. The magnetic attraction of the magnetic pole can lengthen the arc length of the electrode during the closing or opening process under the same electrode gap, so that the arc column can be cooled quickly, the arc heat can be reduced, and the occurrence of welding can be reduced; at the same time, even if a liquid metal bridge is generated between the contacts, the particles scattered after the charged metal bridge melts can also move toward the magnetic pole side under the action of the magnetic attraction force. Since the magnetic pole is arranged on the opposite side, the metal particles are prevented from adhering to the inner wall of the support cover 231 to cause the battery terminal 232 and the motor terminal 233 to be conductive.

[0065] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A starter electromagnetic switch, characterized in that: include: The body is connected to the starter motor; A plunger mechanism is installed in the body and includes a plunger and a movable contact piece installed at the end of the plunger; A support cover mechanism, comprising a support cover and battery terminals and motor terminals mounted on the support cover, wherein the support cover is connected to the body to enclose an accommodation space, the movable contact piece is located within the accommodation space, and the bottom ends of the battery terminals and the bottom ends of the motor terminals are respectively arranged in the accommodation space corresponding to the movable contact pieces; as well as an arc extinguishing mechanism, located in the accommodating space and arranged corresponding to the contact area between the battery terminal, the motor terminal and the moving contact piece; In which, the arc extinguishing mechanism includes a first high-pressure relief valve and a second high-pressure relief valve, the first high-pressure relief valve and the second high-pressure relief valve are respectively located on both sides of the moving contact piece, the first high-pressure relief valve is close to the contact electrode formed by the battery terminal and the moving contact piece, and the second high-pressure relief valve is close to the contact electrode formed by the motor terminal and the moving contact piece, the intake side of the first high-pressure relief valve and the second high-pressure relief valve are connected to the accommodating space, and the outlet side of the first high-pressure relief valve and the second high-pressure relief valve are connected to the atmosphere outside the starter.

2. The electromagnetic switch of the starter according to claim 1, characterized in that The first high-pressure air relief valve and the second high-pressure air relief valve are respectively pre-buried in the support cover, or respectively plugged into the support cover, or respectively connected to the outside of the support cover through threads.

3. The electromagnetic switch of the starter according to claim 1 or 2, characterized in that: The inner wall of the support cover is provided with a coating, and the coating generates a chemical reaction when the support cover is subjected to abnormally high temperature to reduce the damage of the high temperature to the support cover and the terminal.

4. A starter electromagnetic switch, characterized in that: include: The body is connected to the starter motor; A plunger mechanism is installed in the body and includes a plunger and a movable contact piece installed at the end of the plunger; A support cover mechanism, comprising a support cover and battery terminals and motor terminals mounted on the support cover, wherein the support cover is connected to the body to enclose an accommodation space, the movable contact piece is located within the accommodation space, and the bottom ends of the battery terminals and the bottom ends of the motor terminals are respectively arranged in the accommodation space corresponding to the movable contact pieces; as well as an arc extinguishing mechanism, located in the accommodating space and arranged corresponding to the contact area between the battery terminal, the motor terminal and the moving contact piece; In which, the arc extinguishing mechanism includes a first magnetic pole and a second magnetic pole with opposite polarities, the first magnetic pole and the second magnetic pole are respectively located on both sides of the moving contact piece, the first magnetic pole is close to the first contact electrode formed by the battery terminal and the moving contact piece, and the second magnetic pole is close to the second contact electrode formed by the motor terminal and the moving contact piece; the first magnetic pole and the second magnetic pole are both permanent magnet structures, and a groove lower than the inner wall of the support cover is provided in the accommodating space; or, the first magnetic pole and the second magnetic pole are both electromagnets, and the electromagnet includes an electromagnet core and an electromagnetic coil, and the electromagnetic coil is connected to the battery terminal through a delayed disconnection relay, and a metal particle recovery groove is provided in the accommodating space corresponding to the bottom of the electromagnet.

5. The electromagnetic switch of the starter according to claim 4, characterized in that: The arc extinguishing mechanism also includes a first magnetic metal sheet and a second magnetic metal sheet, the first magnetic metal sheet is arranged on one side of the moving contact piece corresponding to the first magnetic pole; the second magnetic metal sheet is arranged on the other side of the moving contact piece corresponding to the second magnetic pole, and the polarity of the first magnetic pole and the second magnetic pole close to the side of the moving contact piece is the same.

6. The electromagnetic switch of the starter according to claim 4, characterized in that: When the first magnetic pole and the second magnetic pole are both electromagnets, the electromagnetic coils of the first magnetic pole and the second magnetic pole are connected to the control end of the starter's control relay through a delayed disconnect relay, the output ends of the electromagnetic coils of the first magnetic pole and the second magnetic pole are grounded, and the winding directions of the electromagnetic coils of the first magnetic pole and the second magnetic pole are the same.

7. The electromagnetic switch of the starter according to claim 5, characterized in that The first magnetic pole, the second magnetic pole, the first magnetic metal sheet and the second magnetic metal sheet are respectively pre-embedded in the support cover, or respectively plugged into the support cover, or respectively fixed to the outside of the support cover by threaded connection or bonding.

8. A starter electromagnetic switch, characterized in that: include: The body is connected to the starter motor; A plunger mechanism is installed in the body and includes a plunger and a movable contact piece installed at the end of the plunger; A support cover mechanism, comprising a support cover and battery terminals and motor terminals mounted on the support cover, wherein the support cover is connected to the body to enclose an accommodation space, the movable contact piece is located within the accommodation space, and the bottom ends of the battery terminals and the bottom ends of the motor terminals are respectively arranged in the accommodation space corresponding to the movable contact pieces; as well as an arc extinguishing mechanism, located in the accommodating space and arranged corresponding to the contact area between the battery terminal, the motor terminal and the moving contact piece; Among them, the arc extinguishing mechanism is a capacitor parallel to both sides of the line connecting the battery terminal and the motor terminal; or a capacitor perpendicular to both sides of the line connecting the battery terminal and the motor terminal, one side plate of the capacitor is connected to the battery terminal, and the other side plate of the capacitor is grounded through the body.

9. A starter, characterized in that: The electromagnetic switch comprises the electromagnetic switch according to any one of claims 1 to 8.

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