JP2014212069A - Electromagnetic switch for starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic switch for a starter capable of securing a brazing strength of a contact member while suppressing adherence of a solder material onto a lateral face of the contact member, and of utilizing wear allowance of the contact member at the maximum.SOLUTION: In an electromagnetic switch for a starter, a groove part 8d for storing a solder material is formed on a brazed surface 8a at a battery side fixed contact part 8, and the groove part 8d is provided while striding over an abutting part 8b of a contact member 15 and a non-abutting part 8c. Thereby, because a brazing state with the solder material stored in the groove part 8d can be visually inspected when the contact member 15 is brazed to the battery side fixed contact part 8, a strength required for the brazing can be secured without adhering the solder material onto a lateral face 15a of the contact member 15, and wear allowance of the contact member 15 can be utilized at the maximum.

Description

  The present invention relates to an electromagnetic switch for a starter.

In recent years, vehicles with an engine are installed to automatically stop the engine when the engine output is not needed for the purpose of improving fuel efficiency, etc., and to automatically restart the engine when the engine output is needed. An idle stop system is being adopted.
In such an idle stop system, the number of restarts of the engine is greatly increased, that is, the number of times of operation of the electromagnetic switch for starting the starter is greatly increased. There are concerns.

Here, for example, according to the electromagnetic switch device for a starter described in Patent Document 1, a contact material constituted by a highly wear-resistant material is provided on either a fixed contact or a movable contact, and therefore, contact wear Can be suppressed.
JP-A-4-87116

  Although not specified in this Patent Document 1, the joining means between the fixed contact or the movable contact and the contact member has a brazing material interposed on the contact surface of the fixed contact or the movable contact with the contact member. Generally, the fixed contact or the movable contact and the contact member are electrically and mechanically joined by heating and melting.

However, in the electromagnetic switch device described in Patent Document 1, the brazing material is merely interposed on the contact surface of the fixed contact or the movable contact with the contact member, and this contact surface is visually observed during brazing. Since this is not possible, it is unclear whether the brazing material has melted reliably and the fixed contact or the movable contact can be joined to the contact member, and the brazing strength required may be insufficient.
Therefore, in order to compensate for the brazing strength at the contact surface with the contact member in the fixed contact or the movable contact, the necessary brazing strength is ensured by making the molten brazing material wrap around the side surface of the contact member. Yes.

  In this case, the side surface of the contact member to which the molten brazing material has adhered cannot be used as a wear allowance in the contact member, and the wear allowance of the contact member cannot be utilized to the maximum, and the contact wear suppression effect is achieved. It was not fully obtained.

  The present invention has been made in order to solve the above-described problems, and while suppressing the adhesion of the brazing material to the side surface of the contact member, it is possible to ensure the brazing strength of the contact member and to prevent the contact member from being worn. An object of the present invention is to provide an electromagnetic switch for starter that can make the most of the above.

  An electromagnetic switch for a starter according to the present invention is connected to a battery side of a motor circuit of a starter and an electromagnetic coil that generates a magnetic force when energized, a plunger that is attracted by the magnetic force generated in the electromagnetic coil, and one axial end A battery-side terminal bolt having a battery-side fixed contact portion at a portion, a motor-side terminal bolt connected to the motor side of the motor circuit and having a motor-side fixed contact portion at one end in the axial direction, and the battery-side fixed contact A battery-side movable contact portion disposed opposite to the motor side, and a motor-side movable contact portion disposed opposite to the motor-side fixed contact portion. A movable contact member that electrically connects and disconnects between the contact portion and the motor side fixed contact portion, and the battery side fixed contact portion or the bar A contact member made of a wear-resistant material on any one of the terry-side movable contact portions and any one of the motor-side fixed contact portion or the motor-side movable contact portion. An electromagnetic switch for a starter to be brazed, wherein a groove portion for accommodating a brazing material is formed on a brazed surface of the contact portion to which the contact member is brazed, and the groove portion is formed on the brazed surface. The contact member is provided across a contact portion of the contact member and a non-contact portion excluding the contact portion on the brazing surface.

According to the starter electromagnetic switch of the present invention, any one of the battery-side fixed contact portion and the battery-side movable contact portion, and any one of the motor-side fixed contact portion and the motor-side movable contact portion. Since contact members each made of a wear-resistant material are brazed to the contact portions, it is possible to suppress a decrease in durability due to contact wear.
Also, a groove portion for accommodating the brazing material is formed on the brazing surface of the contact portion where the contact member is brazed, and the groove portion is provided across the contact portion and the non-contact portion of the contact member on the brazing surface. Therefore, when the contact member is brazed to the contact portion, the brazed state of the brazing material accommodated in the groove portion can be visually confirmed. Thereby, the strength required for brazing can be ensured without attaching the brazing material to the side surface of the contact member, and the wear allowance of the contact member can be utilized to the maximum extent.

It is sectional drawing of the electromagnetic switch for starters which concerns on Embodiment 1 of this invention. It is a figure explaining the shape of the battery side fixed contact part periphery of the electromagnetic switch for starters which concerns on Embodiment 1 of this invention. It is a figure explaining the 1st modification of the shape of the battery periphery stationary contact part periphery which concerns on Embodiment 1 of this invention. It is a figure explaining the 2nd modification of the shape of the battery periphery stationary contact part periphery which concerns on Embodiment 1 of this invention. It is sectional drawing of the electromagnetic switch for starters which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of a starter electromagnetic switch according to Embodiment 1 of the present invention, and FIG. 2 is a diagram illustrating the shape of the periphery of the battery-side fixed contact portion of the starter electromagnetic switch according to Embodiment 1 of the present invention. 2A is a view of the battery-side fixed contact portion as viewed from the contact member side, and FIG. 2B is a cross-sectional view taken along the line AA of FIG. 2A. In addition, in each figure, the same code | symbol shows the same part.

  The starter electromagnetic switch 1 of this embodiment is used, for example, in a starter (not shown) for starting an automobile engine. As shown in FIG. 1, an electromagnetic coil 2 that generates a magnetic force by energization, and an electromagnetic The plunger 3 is attracted by the magnetic force generated in the coil 2, and has a known function of opening and closing a main contact (described later) connected to the motor circuit of the starter in conjunction with the movement of the plunger 3.

The electromagnetic coil 2 is wound around a bobbin 4 and housed in a switch case 5 that forms a yoke.
A fixed iron core 6 that is magnetized by energizing the electromagnetic coil 2 is disposed on one end side of the electromagnetic coil 2. The fixed iron core 6 forms a magnetic circuit around the electromagnetic coil 2 together with the switch case 5 and the plunger 3.
The plunger 3 is disposed on the inner periphery of the electromagnetic coil 2 so as to face the fixed iron core 6 and is pressed toward the anti-fixed iron core 6 by receiving a reaction force of a return spring 7 disposed between the plunger 3 and the plunger 3. Yes.

The main contact is composed of a set of fixed contact portions 8 and 9 and a set of movable contact portions 11 and 12 formed on the movable contact member 10, and the set of movable contact portions 11 and 12 is a plunger 3. The pair of fixed contact portions 8 and 9 are intermittently connected in conjunction with the movement of.
One fixed contact portion 8 (battery side fixed contact portion 8) is formed on a bolt head at one end in the axial direction of a battery side terminal bolt 13 connected to a battery (not shown) and supplied with battery current, The other fixed contact portion 9 (motor-side fixed contact portion 9) is formed on the bolt head at one axial end portion of the motor-side terminal bolt 14.
A contact member 15 made of a wear-resistant material is brazed to each of the battery-side fixed contact portion 8 and the motor-side fixed contact portion 9, and the detailed structure will be described later.
In the present embodiment, a silver alloy is used as the contact member 15, but the present invention is not limited to this.

Moreover, in this Embodiment, although the battery side terminal bolt 13 and the motor side terminal bolt 14 are iron bolts, it is not restricted to this.
The battery side fixed contact portion 8 of the battery side terminal bolt 13 and the motor side fixed contact portion 9 of the motor side terminal bolt 14 are fixed to the resin cover 16 in a state of being disposed inside the resin cover 16.
The resin cover 16 is disposed in contact with the fixed iron core 6 and is caulked and fixed to the end of the switch case 5.

The movable contact member 10 is slidably held by a rod 17 attached to the plunger 3 or provided integrally with the plunger 3. A contact pressure spring 18 is disposed on the outer periphery of the rod 17 between the plunger 3 and the movable contact member 10.
In addition, a return spring 19 is disposed between the resin cover 16 and the movable contact member 10 to urge the set of movable contact portions 11 and 12 away from the set of fixed contact portions 8 and 9. ing.
The set of movable contact portions 11 and 12 is formed at both ends of the movable contact member 10, and one movable contact portion 11 is provided at a position facing the battery side fixed contact portion 8. 11 and the other movable contact portion 12 is a motor-side movable contact portion 12 provided at a position facing the motor-side fixed contact portion 9.

Next, the brazing structure of the battery side fixed contact portion 8 of the battery side terminal bolt 13 and the contact member 15 will be described with reference to FIG.
The following is a description of the brazing structure between the battery-side fixed contact portion 8 and the contact member 15, but the brazing structure between the motor-side fixed contact portion 9 of the motor-side terminal bolt 14 and the contact member 15 is the same structure. Therefore, the description is omitted.
Further, in FIG. 2, illustration of a brazing material used when the contact member 15 is brazed is omitted.
As shown in FIG. 2A, the battery side fixed contact portion 8 of the battery side terminal bolt 13 has a brazing surface 8a to which the contact member 15 is brazed. The contact portion 15b contacts the contact member 15 and the non-contact portion 8c excluding the contact portion 8b.

On the brazing surface 8a, a groove 8d for accommodating a brazing material for brazing the contact member 15 is formed in an annular shape by plastic working. The groove 8d is provided across the contact portion 8b and the non-contact portion 8c, and is provided at a position where it is not exposed to the outside from the side surface 8e of the battery side fixed contact portion 8.
As shown in FIG. 1, the side surface 8 e of the battery side fixed contact portion 8 is held by the resin cover 16, thereby serving as a detent when tightening a nut or the like on the battery side terminal bolt 13. The same applies to the motor side fixed contact portion 9.
Further, the brazing material is not only accommodated in the groove portion 8d, but is also interposed in the abutting portion 8b of the brazing surface 8a as in the prior art, so that the brazing material of the abutting portion 8b and the brazing material accommodated in the groove portion 8d are used. Then, the contact member 15 is brazed to the battery side fixed contact portion 8.

Next, the operation of the starter electromagnetic switch 1 will be described.
When a magnetic force is generated by energizing the electromagnetic coil 2 from the battery by turning on an ignition key (not shown), the plunger 3 is attracted to the fixed iron core 6 side and counteracts the urging force of the return spring 7 to the left in FIG. Moving. When the plunger 3 moves in the direction of the fixed iron core 6, the rod 17 also moves together.
When the rod 17 moves, the movable contact member 10 held by the rod 17 also moves. When the plunger 3 moves by a predetermined amount, the battery-side movable contact portion 11 contacts the battery-side fixed contact portion 8, and the motor-side movable contact portion 12. Contacts the motor-side fixed contact portion 9.

Further, when the plunger 3 moves in the direction of the fixed iron core 6, the load of the contact pressure spring 18 is applied between the battery side movable contact portion 11 and the battery side fixed contact portion 8 and between the motor side movable contact portion 12 and the motor side fixed contact portion. 9 is given.
When the battery-side movable contact portion 11 comes into contact with the battery-side fixed contact portion 8 and the motor-side movable contact portion 12 comes into contact with the motor-side fixed contact portion 9, electric power is supplied from the battery to the starter motor circuit. (Not shown) rotates.

  Thereafter, when the ignition key is turned off and the magnetic coil 2 is de-energized and the magnetic force disappears, the rod 17 and the plunger 3 are returned to their original positions by the load of the return spring 19 and the contact pressure spring 18, so that the battery side The movable contact portion 11 is separated from the battery side fixed contact portion 8, and similarly, the motor side movable contact portion 12 is also separated from the motor side fixed contact portion 9, and power supply from the battery is lost. Thereby, the energization to the motor circuit of the starter is cut off, and the starter motor stops.

According to the starter electromagnetic switch 1 described above, any one of the battery-side fixed contact portion 8 and the battery-side movable contact portion 11 (in the present embodiment, the battery-side fixed contact portion 8) has an abrasion resistance. The contact member 15 made of a conductive material is brazed, and either one of the motor side fixed contact portion 9 and the motor side movable contact portion 12 (in this embodiment, the motor side fixed contact portion 9) Since the contact member 15 made of a wear-resistant material is brazed, it is possible to suppress a decrease in durability due to contact wear.
Further, in the starter electromagnetic switch 1 of the present embodiment, a groove portion 8d for accommodating the brazing material is formed on the brazing surface 8a of the battery side fixed contact portion 8 to which the contact member 15 is brazed, and the groove portion 8d is formed. It is provided across the contact portion 8b and the non-contact portion 8c of the contact member 15 on the brazing surface 8a. Thereby, when the contact member 15 is brazed to the battery side fixed contact portion 8, the brazing state by the brazing material accommodated in the groove portion 8d can be visually checked, so that the brazing material is attached to the side surface 15a of the contact member 15. Therefore, the strength required for brazing can be ensured, and the wear allowance of the contact member can be utilized to the maximum.
Needless to say, the brazing between the motor-side fixed contact portion 9 and the contact member 15 has the same effect due to the above structure.

  Here, in the present embodiment, the case where the contact member 15 is brazed to the battery side fixed contact portion 8 and the motor side fixed contact portion 9 has been described, but the battery side movable contact portion 11 and the motor side movable contact portion 12 are connected to each other. Even when the contact member 15 is brazed, the groove portion that accommodates the brazing material across the contact portion and the non-contact portion of the contact member 15 on the brazed surface of the battery side movable contact portion 11 or the motor side fixed contact portion 9. By providing the above, the same effect as described above can be obtained.

Moreover, in this Embodiment, the groove part 8d of the battery side fixed contact part 8 is formed in the position which is not exposed outside from the side surface 8e of the battery side fixed contact part 8. FIG.
For this reason, since it can prevent that the brazing | wax material accommodated in the groove part 8d leaks out from the side surface 8e of the battery side fixed contact part 8, when the battery side terminal volt | bolt 13 is assembled | attached to the resin cover 16, a brazing | wax material interferes. It is possible to prevent the occurrence of poor assembly due to the above.
In addition, the groove part formed in the motor side fixed contact part 9 also has the same effect by forming it in a position not exposed to the outside from the side surface of the motor side fixed contact part 9.

  Furthermore, in this embodiment, since the groove 8d of the battery side fixed contact portion 8 is formed by plastic working, the processing time is short and the processing cost is reduced as compared with the case of forming by cutting or the like. Can be reduced.

[Modification]
Next, a modified example of the shape of the groove 8d in the first embodiment will be described. FIG. 3 is a diagram for explaining a first modification of the shape around the battery-side fixed contact portion according to Embodiment 1 of the present invention. FIG. 3A shows the contact member around the battery-side fixed contact portion. FIG. 3B is a cross-sectional view taken along the line BB in FIG.
FIG. 4 is a diagram for explaining a second modification of the shape around the battery-side fixed contact portion according to Embodiment 1 of the present invention. FIG. FIG. 4B is a cross-sectional view taken along the line CC of FIG. 4A, and FIG. 4C is a view taken along the line DD of FIG. 4A. FIG.

  In the first embodiment, the groove 8d is formed in an annular shape on the brazing surface 8a of the battery-side fixed contact portion 8. However, the present invention is not limited to this. For example, the first modification shown in FIG. As shown in FIG. 4, four groove portions 8d may be formed on the brazing surface 8a, and a cross-shaped groove portion 8d may be formed on the brazing surface 8a as in the second modification shown in FIG. .

In any modification, the groove 8d is provided across the abutting portion 8b and the non-abutting portion 8c of the contact member 15 on the brazing surface 8a, so that the brazing state by the brazing material accommodated in the groove 8d is provided. Therefore, the strength required for brazing can be ensured without attaching the brazing material to the side surface 15a of the contact member 15, and the wear allowance of the contact member 15 can be utilized to the maximum.
Furthermore, also in the case of each modification, if the groove portion 8d is formed at a position where it is not exposed to the outside from the side surface 8e of the battery side fixed contact portion 8, the brazing material accommodated in the groove portion 8d is fixed to the battery side fixed portion as described above. Since leakage from the side surface 8e of the contact portion 8 can be prevented, it is possible to prevent an assembly failure caused by the interference of the brazing material when the battery-side terminal bolt 13 is assembled to the resin cover 16.

Embodiment 2. FIG.
FIG. 5 is a cross-sectional view of the starter electromagnetic switch according to Embodiment 2 of the present invention.
In the present embodiment, a contact member 15 made of a wear-resistant material is brazed to the battery-side fixed contact portion 8 of the battery-side fixed contact portion 8 and the battery-side movable contact portion 11, and the motor-side fixed contact portion 9. In the motor-side movable contact portion 12, the contact member 15 made of an abrasion-resistant material is brazed to the motor-side movable contact portion 12.

In the contact wear, the metal of the contact portion on the side where electrons flow (the side on which the electrons hit) melts and adheres to the contact portion on the opposite side. That is, in the starter electromagnetic switch 1 of the present invention, the metal on the battery side fixed contact portion 8 side melts and adheres to the metal on the battery side movable contact portion 11 side, and the metal on the motor side movable contact portion 12 side melts. Then, it adheres to the metal on the motor side fixed contact portion 9 side.
Therefore, the contact wear can be effectively suppressed by brazing the contact member 15 to the battery side fixed contact portion 8 and brazing the contact member 15 to the motor side movable contact portion 12.

  The starter electromagnetic switch 1 according to the present invention may be applied not only to a starter used in an idling stop system but also to a starter used in a vehicle not equipped with a conventional idling stop system.

DESCRIPTION OF SYMBOLS 1 Starter electromagnetic switch 2 Electromagnetic coil 3 Plunger 8 Battery side fixed contact part 8b Contact part 8c Non-contact part 8d Groove part 8e Side surface 9 Motor side fixed contact part 10 Movable contact member 11 Battery side movable contact part 12 Motor side movable contact part Part 13 Battery side terminal bolt 14 Motor side terminal bolt 15 Contact member 16 Resin cover

An electromagnetic switch for a starter according to the present invention is connected to a battery side of a motor circuit of a starter and an electromagnetic coil that generates a magnetic force when energized, a plunger that is attracted by the magnetic force generated in the electromagnetic coil, and one axial end A battery-side terminal bolt having a battery-side fixed contact portion at a portion, a motor-side terminal bolt connected to the motor side of the motor circuit and having a motor-side fixed contact portion at one end in the axial direction, and the battery-side fixed contact A battery-side movable contact portion disposed opposite to the motor side, and a motor-side movable contact portion disposed opposite to the motor-side fixed contact portion. A movable contact member that electrically connects and disconnects between the contact portion and the motor side fixed contact portion, and the battery side fixed contact portion or the bar And one of the contact portions one of Teri movable contact part, the flat plate the motor-side fixed contact portion, or the one contact portion one of the motor-side movable contact part configured respectively with a wear resistant material An electromagnetic switch for a starter to which a shaped contact member is brazed, wherein a groove portion for accommodating a brazing material is formed on a brazed surface of the contact portion to which the contact member is brazed, and the groove portion is It is provided across the contact part of the contact member on the brazing surface and the non-contact part excluding the contact part on the brazing surface.

According to the starter electromagnetic switch of the present invention, any one of the battery-side fixed contact portion and the battery-side movable contact portion, and any one of the motor-side fixed contact portion and the motor-side movable contact portion. Since contact members each made of a wear-resistant material are brazed to the contact portions, it is possible to suppress a decrease in durability due to contact wear.
Also, a groove portion for accommodating the brazing material is formed on the brazing surface of the contact portion where the contact member is brazed, and the groove portion is provided across the contact portion and the non-contact portion of the contact member on the brazing surface. Therefore, when the contact member is brazed to the contact portion, the brazed state of the brazing material accommodated in the groove portion can be visually confirmed. Thereby, the strength required for brazing can be secured without attaching the brazing material to the side surface of the flat contact member, and the wear allowance of the contact member can be utilized to the maximum extent.

The main contact is composed of a set of fixed contact portions 8 and 9 and a set of movable contact portions 11 and 12 formed on the movable contact member 10, and the set of movable contact portions 11 and 12 is a plunger 3. The pair of fixed contact portions 8 and 9 are intermittently connected in conjunction with the movement of.
One fixed contact portion 8 (battery side fixed contact portion 8) is formed on a bolt head at one end in the axial direction of a battery side terminal bolt 13 connected to a battery (not shown) and supplied with battery current, The other fixed contact portion 9 (motor-side fixed contact portion 9) is formed on the bolt head at one axial end portion of the motor-side terminal bolt 14.
Each of the battery-side fixed contact portion 8 and the motor-side fixed contact portion 9 is brazed with a flat contact member 15 made of an abrasion-resistant material. The detailed structure will be described later.
In the present embodiment, a silver alloy is used as the contact member 15, but the present invention is not limited to this.

According to the starter electromagnetic switch 1 described above, any one of the battery-side fixed contact portion 8 and the battery-side movable contact portion 11 (in the present embodiment, the battery-side fixed contact portion 8) has an abrasion resistance. The contact member 15 made of a conductive material is brazed, and either one of the motor side fixed contact portion 9 and the motor side movable contact portion 12 (in this embodiment, the motor side fixed contact portion 9) Since the contact member 15 made of a wear-resistant material is brazed, it is possible to suppress a decrease in durability due to contact wear.
Further, in the starter electromagnetic switch 1 of the present embodiment, a groove portion 8d for accommodating the brazing material is formed on the brazing surface 8a of the battery side fixed contact portion 8 to which the contact member 15 is brazed, and the groove portion 8d is formed. It is provided across the contact portion 8b and the non-contact portion 8c of the contact member 15 on the brazing surface 8a. Accordingly, when the contact member 15 is brazed to the battery side fixed contact portion 8, the brazing state by the brazing material accommodated in the groove portion 8d can be visually checked, so that the brazing material is attached to the side surface 15a of the flat contact member 15. Therefore, the strength required for brazing can be ensured, and the wear allowance of the contact member can be fully utilized.
Needless to say, the brazing between the motor-side fixed contact portion 9 and the contact member 15 has the same effect due to the above structure.

In any modification, the groove 8d is provided across the abutting portion 8b and the non-abutting portion 8c of the contact member 15 on the brazing surface 8a, so that the brazing state by the brazing material accommodated in the groove 8d is provided. Therefore, the strength necessary for brazing can be secured without attaching the brazing material to the side surface 15a of the flat contact member 15, and the wear allowance of the contact member 15 can be maximized. Can do.
Furthermore, also in the case of each modification, if the groove portion 8d is formed at a position where it is not exposed to the outside from the side surface 8e of the battery side fixed contact portion 8, the brazing material accommodated in the groove portion 8d is fixed to the battery side fixed portion as described above. Since leakage from the side surface 8e of the contact portion 8 can be prevented, it is possible to prevent an assembly failure caused by the interference of the brazing material when the battery-side terminal bolt 13 is assembled to the resin cover 16.

Claims (4)

An electromagnetic coil that generates a magnetic force when energized;
A plunger attracted by the magnetic force generated in the electromagnetic coil;
A battery-side terminal bolt connected to the battery side of the motor circuit of the starter and having a battery-side fixed contact portion at one end in the axial direction;
A motor-side terminal bolt connected to the motor side of the motor circuit and having a motor-side fixed contact portion at one end in the axial direction;
A battery-side movable contact portion disposed opposite to the battery-side fixed contact portion; and a motor-side movable contact portion disposed opposite to the motor-side fixed contact portion, in conjunction with movement of the plunger. A movable contact member electrically connecting between the battery side fixed contact portion and the motor side fixed contact portion,
Either one of the battery-side fixed contact portion or the battery-side movable contact portion and one of the motor-side fixed contact portion or the motor-side movable contact portion, An electromagnetic switch for a starter to which a contact member made of a wear-resistant material is brazed,
A groove portion for accommodating a brazing material is formed on the brazing surface of the contact portion to which the contact member is brazed,
The electromagnetic switch for a starter, wherein the groove portion is provided across a contact portion of the contact member on the brazing surface and a non-contact portion excluding the contact portion on the brazing surface. . The starter electromagnetic switch according to claim 1,
The battery-side fixed contact portion and the motor-side fixed contact portion are housed inside, and a resin cover that holds the side surface of the battery-side fixed contact portion and the side surface of the motor-side fixed contact portion is provided.
The contact member is brazed to the battery side fixed contact portion and the motor side fixed contact portion,
2. The starter electromagnetic switch according to claim 1, wherein the groove portion is provided at a position not exposed to the outside from the side surface of the battery side fixed contact portion and the side surface of the motor side fixed contact portion. . The starter electromagnetic switch according to claim 1,
The starter electromagnetic switch, wherein the contact member is brazed to the battery side fixed contact portion and the motor side movable contact portion. The starter electromagnetic switch according to any one of claims 1 to 3,
The electromagnetic switch for a starter, wherein the groove is formed by plastic working.

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