JP2010067407A - Electromagnetic switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic switch 1 capable of reducing a collision sound generated when a movable iron core 16 collides against a fixed iron core 14. <P>SOLUTION: The movable iron core 16 has a laminated part 21 on an end part of a side opposed to a base part 14a. The laminated part 21 is arranged on an end face of the movable iron core 16 in a state that a plurality of ring-shaped thin steel sheets are laminated, and, moreover, is fixed with an outer diameter of a large diameter part 18a of a rod press-inserted into an inner diameter of each of the thin steel sheets. The laminated part 21 is press-inserted into and fixed with the large diameter part 18a of the rod at its inner diameter side only, and the outer diameter sides of the laminated sheets are separated one sheet by one sheet. In the above structure, when the movable iron core 16 is attracted to the base part 14a of the fixed iron core 14 by flowing of electricity to an electromagnetic coil 13, the movable iron core 16 collides with the base part 14a with the laminated part 21 provided on the end face of the movable iron core 16 in-between and a shock at collision is alleviated by the lamination part 21. As a result, a collision sound generated at collision can be reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

As a prior art, an electromagnetic switch for starter described in Patent Document 1 is known.
The electromagnetic switch includes a fixed iron core that is magnetized by energization of the electromagnetic coil and a movable iron core that is attracted to the magnetized fixed iron core, and electric contacts (main contacts of the motor circuit) in conjunction with the movement of the movable iron core. ).
The fixed iron core is divided into a base portion arranged opposite to the movable iron core and a disk portion that fits on the outer periphery of the base portion and holds the base portion. It is configured by stacking steel plates.

When the above electromagnetic switch is operated, that is, when the fixed iron core is magnetized by energizing the electromagnetic coil, the movable iron core made of the soft steel body collides with the base portion also made of the soft steel body. appear. At this time, since the fixed iron core is formed by laminating a plurality of thin steel plates with the disk portion holding the base portion, the propagation of vibration generated by the collision between the movable iron core and the base portion is suppressed. Thereby, although the sound radiated | emitted outside is reduced to some extent, since the collision sound itself is not reduced, the effect which can reduce the operating sound of an electromagnetic switch is not large.
JP 2007-242585 A

  In recent years, as an automobile exhaust gas countermeasure that is one of the causes of global warming, for example, the movement to introduce an idle stop system that automatically stops an engine when a signal stops at an intersection is accelerating. However, as the number of vehicles equipped with the idle stop system increases, the number of cases where many vehicles start the engine all at once on a general road in a traffic jam increases, so the sound (generated sound) generated when the engine starts increases. A noise problem around the road is expected.

Therefore, in order to spread the idle stop system, it is a problem to reduce the sound generated when starting the engine. Among these, in the starter, as the sound generated at the time of starting, there is an operation sound of the electromagnetic switch together with a gear meshing sound generated when the pinion gear meshes with the ring gear on the engine side. The operation sound of this electromagnetic switch is the sound that is generated at the moment when the electromagnetic switch is turned on, that is, the collision sound that is generated when the movable iron core collides with the fixed iron core. This is important in reducing the sound generated at the time.
The present invention has been made based on the above circumstances, and an object of the present invention is to provide an electromagnetic switch capable of reducing a collision sound generated when a movable iron core collides with a fixed iron core.

(Invention of Claim 1)
The present invention relates to an electromagnetic coil that forms an electromagnet by energization, a fixed iron core that is arranged on one end side in the axial direction of the electromagnetic coil and is magnetized by energization of the electromagnetic coil, and an electromagnetic coil that faces the fixed iron core. In an electromagnetic switch including a movable iron core that moves in the axial direction around the circumference, one or both of the movable iron core and the fixed iron core are placed at a position where the movable iron core is attracted to the magnetized fixed iron core and the two collide with each other. It is characterized in that a laminated portion in which a thin steel plate is laminated in the axial direction is provided.
According to said structure, when a movable iron core is attracted | sucked to the magnetized fixed iron core, since a movable iron core and a fixed iron core collide via a laminated part, the impact at the time of a collision is relieve | moderated by a laminated part. As a result, the sound generated by the vibration at the time of collision can be reduced, so that the operating sound of the electromagnetic switch can be reduced.

(Invention of Claim 2)
The electromagnetic switch according to claim 1, wherein the movable iron core or the fixed iron core constituting the laminated portion is provided with a boss portion for holding and fixing the laminated portion, and each of the plurality of thin steel plates is rounded at the center portion. It is formed in a ring shape with holes open, and the laminated part is a state in which a plurality of thin steel plates are overlapped with each other by press fitting or caulking by fitting the boss part to the inner periphery of the round hole. The inner peripheral side of a steel plate is fixed to the boss | hub part, and the outer peripheral side of several thin steel plates is overlaid in the state which each thin steel plate isolate | separated.
Since the inner peripheral side of a plurality of thin steel plates is fixed to the boss portion in the laminated portion, even when the movable iron core repeatedly collides with the fixed iron core, the laminated portion does not fall out of the boss portion, and the durability can be ensured.
Moreover, since the thin steel plates are separated from each other and are not fixed on the outer peripheral side of the plurality of thin steel plates, it is possible to obtain a frictional effect due to the relative displacement between the thin steel plates, and the impact relaxation effect is reduced. There is nothing.

(Invention of Claim 3)
3. The electromagnetic switch according to claim 1, wherein the laminated portion includes a resin member having a thickness of 1/10 or less of the thickness of the thin steel plate between the thin steel plate and the thin steel plate. Features.
According to the present invention, the impact mitigating effect is increased as compared with the case where only a plurality of thin steel plates are laminated, so that the generated collision noise can be further reduced.
Moreover, by setting the thickness of the resin member to be sufficiently thinner than that of the thin steel plate, the influence on the magnetic attraction force is small, and the same attraction performance as when no resin member is used can be ensured.

(Invention of Claim 4)
The electromagnetic switch according to any one of claims 1 to 3, wherein the fixed iron core is a base portion disposed to face the movable iron core, and an annular disk that is fitted to an outer periphery of the base portion and holds the base portion. The disk portion is formed by laminating a plurality of thin steel plates.
According to this configuration, it is possible to reduce the generation of sound due to the propagation of vibration caused by the collision between the movable iron core and the fixed iron core, so that the operation sound of the electromagnetic switch can be further reduced.

(Invention of Claim 5)
An automobile starter equipped with any one of the electromagnetic switches according to claim 1.
By mounting the electromagnetic switch of the present invention on a starter, a starter with low operating noise can be provided. In addition, since the starter operation noise can be reduced for an idle stop vehicle in which the number of starter operations is increased, noise problems around the road on which the vehicle travels can be suppressed, and the road environment can be improved.

  The best mode for carrying out the present invention will be described in detail by the following examples.

FIG. 1 is a cross-sectional view of the electromagnetic switch 1.
As shown in FIG. 2, the electromagnetic switch 1 of this embodiment is mounted on a starter 2 for starting an automatic engine, and pushes the pinion gear 3 toward the ring gear 4 of the engine via a shift lever (not shown). It has the function of intermittently energizing current to the motor 5.
As shown in FIG. 1, the electromagnetic switch 1 includes two terminal bolts 6 and 7 connected to an energization circuit of a motor 5 and a resin contact cover to which the two terminal bolts 6 and 7 are fixed. 8, a set of fixed contacts 9, 10 provided integrally with the two terminal bolts 6, 7, a movable contact 11 electrically connecting and disconnecting the set of fixed contacts 9, 10, and the movable contact 11 is composed of a switch main body (described below) and the like.

The switch body includes a switch case 12 that forms a machine frame and also serves as a magnetic circuit, an electromagnetic coil 13 that is accommodated in the switch case 12, a fixed iron core 14 that is magnetized by energization of the electromagnetic coil 13, The movable iron core 16 is inserted into the inner periphery of the electromagnetic coil 13 via the sleeve 15, the return spring 17 is disposed between the fixed iron core 14 and the movable iron core 16, the rod 18 that supports the movable contact 11, and the like. Is done.
The switch case 12 is provided in a cylindrical shape having one end side in the axial direction (right side in the drawing) opened and an annular bottom surface on the other end side in the axial direction.
The electromagnetic coil 13 includes a suction coil 13a and a holding coil 13b wound around a resin bobbin 19 in a two-layer state, and forms an electromagnet when energized.

The fixed iron core 14 is divided into a base portion 14a disposed on the inner circumference on one end side of the sleeve 15 and a ring-shaped disk portion 14b disposed adjacent to one end side in the axial direction of the bobbin 19, The outer periphery of the base portion 14a is press-fitted into the inner periphery of the disk portion 14b, and both are integrally formed. The fixed iron core 14 is positioned in the axial direction with the coil-side outer diameter portion in the plate thickness direction of the disk portion 14b abutting against a step formed on the inner circumference on one end side of the switch case 12.
An elastic member 20 that presses the electromagnetic coil 13 toward the disk portion 14b is disposed between the bottom surface of the switch case 12 and the end surface of the bobbin 19 on the other end side in the axial direction. The movement of the electromagnetic coil 13 in the axial direction is suppressed.

The movable iron core 16 is provided in a bottomed cylindrical shape having a bottom surface on one end side (right side in the drawing) in the axial direction and opened on the other end side. It is arranged to be slidable in the axial direction. The movable iron core 16 is provided with a later-described laminated portion 21 at an end portion on one end side facing the base portion 14a.
The movable iron core 16 includes a joint member 22 for transmitting the movement of the movable iron core 16 to the shift lever, and a push for pushing the pinion gear 3 into the ring gear 4 after the pinion gear 3 abuts the ring gear 4 when the engine is started. A drive spring 23 that applies pressure to the pinion gear 3 is incorporated.

One end side of the joint member 22 in the axial direction is inserted into the cylinder of the movable iron core 16, and receives the reaction force of the drive spring 23 accommodated in the cylinder of the movable iron core 16, so that the joint member 22 The provided flange portion 22a is pressed against the bottom surface inside the cylinder.
The drive spring 23 is disposed in a state where elasticity is accumulated between the flange portion 22 a of the joint member 22 and a locking washer 24 that is caulked and fixed to the cylindrical opening of the movable iron core 16.
The return spring 17 has a function of pushing back the movable iron core 16 in the direction opposite to the base portion (the left direction in the drawing) when the energization of the electromagnetic coil 13 is interrupted.
The rod 18 passes through the central opening of the base portion 14a and is disposed in the axial direction, and a large diameter portion 18a provided at one end is fixed to the end surface of the movable iron core 16 by welding or the like.

The contact cover 8 is provided in a bottomed shape having a cylindrical leg portion 8 a, and the distal end side of the leg portion 8 a is fitted to the inner periphery of the one end side opening portion of the switch case 12, so that the disk portion 14 b of the fixed iron core 14. On the other hand, a part or the entire circumference of the leg portion 8a is caulked and fixed to the opening end of the switch case 12 through the rubber packing 25.
The two terminal bolts 6 and 7 are a B terminal bolt 6 connected to an in-vehicle battery (not shown) via a battery cable and a positive brush (inside the motor) via a motor lead wire 26 (see FIG. 2). M terminal bolts 7 connected to each other (not shown), which are fixed to the bottomed portion of the contact cover 8 via caulking washers 27, respectively.

The B terminal bolt 6 and the M terminal bolt 7 have their bolt heads disposed inside the contact cover 8, and fixed contacts 9 and 10 are provided integrally with the bolt heads, respectively.
The movable contact 11 is slidably supported through insulating members 28 and 29 on the other end of the rod 18 that passes through the central opening of the base portion 14 a and protrudes into the contact cover 8. The contact pressure spring 30 disposed on the outer periphery biases the rod 18 in the distal direction (right direction in FIG. 1), and is prevented from coming off the rod 18 by a washer 31 fixed to the distal end portion of the rod 18.

Then, the laminated part 21 which concerns on this invention is demonstrated.
The laminated portion 21 is arranged on the end surface of the movable iron core 16 in a state where a plurality of ring-shaped thin steel plates having a round hole open at the center portion, and the inner diameter of the round hole of each thin steel plate The outer diameter of the large diameter portion 18a is fixed by press fitting. In addition, the laminated part 21 is not necessarily joined between adjacent thin steel plates by bonding or the like, but is superposed in a state where the thin steel plates are separated one by one, and the large diameter portion 18a of the rod 18 is only on the inner diameter side of each thin steel plate. It is press-fitted and fixed to.
The laminated portion 21 has an outer diameter of each thin steel plate so that the outer periphery of the laminated portion 21 does not slide on the inner peripheral surface of the sleeve 15 when the movable iron core 16 moves in the axial direction. Are formed to have the same dimensions as or slightly smaller than the outer diameter of the movable iron core 16.

Next, the operation of the electromagnetic switch 1 will be described.
When the electromagnetic coil 13 is energized by turning on a start switch (not shown), an electromagnet is formed and the fixed iron core 14 is magnetized. Therefore, the magnet is attracted between the base portion 14a of the fixed iron core 14 and the movable iron core 16. Power works. As a result, the movable iron core 16 moves to the base portion 14a side (the right direction in FIG. 1) while compressing the return spring 17, and the laminated portion 21 formed on the end surface of the movable iron core 16 collides with the end surface of the base portion 14a. Then stop. By the movement of the movable iron core 16, the pinion gear 3 is pushed out to the ring gear 4 side through a shift lever connected to the joint member 22, and the movable contact 11 supported by the end of the rod 18 is a set of fixed contacts. 9 and 10, the load of the contact pressure spring 30 is applied to the movable contact 11.

As a result, the movable contact 11 receives the load of the contact pressure spring 30 and is pressed against the set of fixed contacts 9, 10, and the set of fixed contacts 9, 10 conducts via the movable contact 11, thereby Power is supplied to the motor 5.
After the engine is started, when the start switch is turned off and the energization of the electromagnetic coil 13 is stopped and the attraction force of the electromagnet disappears, the movable iron core 16 is pushed back toward the anti-base portion by the reaction force of the return spring 17. When the contact 11 is separated from the set of fixed contacts 9 and 10 and the set of fixed contacts 9 and 10 are electrically disconnected, power supply from the battery to the motor 5 is stopped.

(Effect of Example 1)
The electromagnetic switch 1 according to the present embodiment is configured such that when the movable iron core 16 is attracted to the base portion 14a of the fixed iron core 14 by energization of the electromagnetic coil 13, the laminated portion 21 provided on the end surface of the movable iron core 16 is used. Since the movable iron core 16 and the base portion 14a collide, the impact at the time of collision is alleviated by the laminated portion 21. As a result, it is possible to reduce the collision sound generated at the time of collision.
The laminated portion 21 provided in the movable iron core 16 has the inner diameter side of a plurality of thin steel plates press-fitted and fixed to the large diameter portion 18a of the rod 18, so that even when the movable iron core 16 repeatedly collides with the base portion 14a, the rod The laminated portion 21 does not fall out of the 18 large diameter portions 18a, and the durability can be ensured. Moreover, since the thin steel plates are separated from each other and are not fixed to each other on the outer peripheral side of the plurality of thin steel plates, it is possible to obtain a friction effect due to the relative displacement between the thin steel plates, and to reduce the impact Will not decrease.
Furthermore, when the starter 2 including the electromagnetic switch 1 of the present embodiment is applied to an idle stop vehicle (a vehicle equipped with an idle stop system), the operation noise of the starter 2 can be reduced, so that the noise problem around the road on which the vehicle travels Can be suppressed and the road environment can be improved.

FIG. 3 is a cross-sectional view of the electromagnetic switch 1 according to the second embodiment.
As shown in FIG. 3, the electromagnetic switch 1 of the present embodiment has the same basic configuration as that of the first embodiment, and differs from the first embodiment in that the laminated portion 21 is configured on the base portion 14 a of the fixed iron core 14. Is a point.
As in the case of the first embodiment, the laminated portion 21 is configured by overlapping a plurality of ring-shaped thin steel plates, and the outer diameter of the cylindrical boss portion 14c provided on the base portion 14a is set to be a round hole of each thin steel plate. It is fixed by press-fitting to the inner diameter.
Also in this embodiment, the same effect as that of Embodiment 1 can be obtained. That is, since the impact when the movable iron core 16 collides with the base portion 14a can be reduced by the laminated portion 21, the collision sound generated at the time of the collision can be reduced.

FIG. 4 is a cross-sectional view of the electromagnetic switch 1 according to the third embodiment.
The electromagnetic switch 1 of the present embodiment has a function of pushing the pinion gear 3 to the ring gear 4 side of the engine via a shift lever (not shown) and a function of intermittently energizing the current supplied to the motor 5, respectively. And a movable iron core.
Specifically, the electromagnetic coil 13 and the movable iron core 16 responsible for pushing the pinion gear 3 toward the ring gear 4 of the engine, and the second electromagnetic coil 32 and the second movable iron core responsible for interrupting the energization current to the motor 5. 33 and a fixed iron core 14 shared by both functions.
In the present embodiment, parts that are substantially the same as those in the first embodiment will be described with the same reference numerals. In the following description, the right side of the electromagnetic switch 1 shown in FIG. 3 is called the axial motor side, and the left side of the electromagnetic switch 1 is called the axial pinion side.

The fixed iron core 14 includes a base portion 14a and a disk portion 14b as in the first embodiment. However, the disk portion 14b is different from the first and second embodiments in that the disk portion 14b has a laminated structure formed by superposing a plurality of thin steel plates.
The electromagnetic coil 13 and the second electromagnetic coil 32 are wound around resin bobbins 19 and 34, respectively, and are housed inside the switch case 12 with the disk portion 14b of the fixed iron core 14 interposed therebetween. That is, the electromagnetic coil 13 is disposed on the axial pinion side with respect to the disk portion 14b, and the second electromagnetic coil 32 is disposed on the axial motor side with respect to the disk portion 14b.

The second electromagnetic coil 32 is positioned in the axial direction via a magnetic plate 35 that is disposed adjacent to the axial motor side of the bobbin 34. The magnetic plate 35 forms a part of the magnetic circuit, and is insert-molded in a resin member 36 provided integrally with the bobbin 34.
A cylindrical spacer member 37 that forms a part of the magnetic circuit is disposed between the disk portion 14 b of the fixed iron core 14 and the magnetic plate 35 on the outer periphery of the second electromagnetic coil 32. Thus, the position on the axial pinion side of the magnetic plate 35 is fixed.

The movable iron core 16 is slidably inserted into the inner periphery of the electromagnetic coil 13 so as to face the end surface on the axial pinion side of the base portion 14a, and axially by a return spring 17 disposed between the movable iron core 16 and the base portion 14a. It is energized to the pinion side. Similar to the first embodiment, the movable iron core 16 is provided with a laminated portion 21 formed by stacking a plurality of ring-shaped thin steel plates. The laminated portion 21 is fixed to the movable iron core 16 by a caulking portion 16b by fitting the outer diameter of the convex portion 16a provided at the center of the bottom surface of the movable iron core 16 to the inner diameter of the round hole of each thin steel plate.
The second movable iron core 33 is slidably inserted into the inner periphery of the second electromagnetic coil 32 so as to face the end surface of the base portion 14a on the axial direction motor side, and is disposed between the second movable iron core 33 and the base portion 14a. The return spring 38 is urged toward the axial motor side.

A resin rod 18 is attached to the second movable iron core 33.
A movable contact 11 is fixed to the tip of the rod 18 on the axial motor side.
The movable contact 11 is pressed against the contact receiving surface 8b provided on the contact cover 8 when the second electromagnetic coil 32 is not energized, and the contact pressure spring biases the movable contact 11 toward the axial pinion side. A load of 30 is applied.
Inside the contact cover 8, one fixed contact 9 provided on the B terminal bolt 6 and the other fixed contact 10 provided on the M terminal bolt 7 are arranged.
The B terminal bolt 6 and the M terminal bolt 7 are attached to the bottomed portion of the contact cover 8 as in the first embodiment, and are fixed by caulking washers 27, respectively.

Next, the operation of the electromagnetic switch 1 will be described.
The electromagnetic coil 13 and the second electromagnetic coil 32 are energized and controlled by an ECU (an electronic control device that controls engine start) (not shown).
First, the electromagnetic coil 13 is energized through the ECU. Thereby, the movable iron core 16 is attracted | sucked by the base part 14a, and moves to the axial direction motor side, and the pinion gear 3 is extruded to a non- motor direction via a shift lever.

  After the pinion gear 3 comes into contact with the ring gear 4 (see FIG. 2) of the engine, the second electromagnetic coil 32 is energized through the ECU. As a result, the second movable iron core 33 is attracted by the base portion 14a and moved to the axial pinion side, so that the movable contact 11 comes into contact with the pair of fixed contacts 9, 10, and both the fixed contacts 9, 10 Conduction between. As a result, when the motor 5 is energized from the battery and a rotational force is generated in the motor 5, the rotational force is transmitted to the pinion gear 3. The rotational force is transmitted from the pinion gear 3 to the ring gear 4 to crank the engine.

(Effect of Example 3)
Since the electromagnetic switch 1 of the present embodiment is provided with the laminated portion 21 on the end surface of the movable iron core 16 facing the base portion 14a in the axial direction as in the first embodiment, the movable iron core 16 is the base portion of the fixed iron core 14. When sucked by 14a, the movable iron core 16 and the base portion 14a collide with each other through the laminated portion 21. Thereby, since the impact at the time of a collision is relieved by the lamination | stacking part 21, the collision sound generated at the time of a collision can be reduced.
Further, since the fixed iron core 14 is configured by laminating a plurality of thin steel plates with the disk portion 14b holding the base portion 14a, the propagation of vibrations generated by the collision between the movable iron core 16 and the base portion 14a is suppressed. The sound radiated to the outside is reduced. As a result, compared with the first embodiment, the sound generated by the electromagnetic switch 1 can be further reduced.

(Modification)
The laminated part 21 described in Examples 1 to 3 may have a resin member interposed between the thin steel sheet and the thin steel sheet. This resin member has, for example, a thickness of 1/10 or less of the thickness of the thin steel plate, and its influence on the magnetic attractive force is small. By interposing the resin member between the thin steel plates, the impact mitigating effect is increased as compared with the case where only a plurality of thin steel plates are laminated, so that the generated collision noise can be further reduced. In addition, by reducing the thickness of the resin member, it is possible to ensure the suction performance equivalent to the case where the resin member is not used.
In Examples 1-3, although the example which provides the laminated part 21 in any one of the movable iron core 16 and the base part 14a was described, the laminated part 21 can also be provided in both the movable iron core 16 and the base part 14a. In this case, when the movable iron core 16 is attracted to the base portion 14a, the laminated portions 21 provided on the two collide with each other, so that it is possible to further reduce the occurrence of collision noise.

1 is a cross-sectional view of an electromagnetic switch according to Embodiment 1. FIG. It is a side view of a starter. 6 is a sectional view of an electromagnetic switch according to Embodiment 2. FIG. 7 is a cross-sectional view of an electromagnetic switch according to Embodiment 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic switch 2 Starter 13 Electromagnetic coil 14 Fixed iron core 14a Base part of fixed iron core 14b Disk part of fixed iron core 14c Cylindrical boss part 16 Movable iron core 16a Convex part (boss part) provided in movable iron core
18a Large diameter part (boss part) of rod
21 Laminated portion 32 Second electromagnetic coil 33 Second movable iron core

Claims (5)

An electromagnetic coil that forms an electromagnet when energized;
A fixed iron core that is disposed on one end side in the axial direction of the electromagnetic coil and is magnetized by energization of the electromagnetic coil;
In an electromagnetic switch provided with a movable iron core that moves in the axial direction the inner circumference of the electromagnetic coil facing the fixed iron core,
One or both of the movable iron core and the fixed iron core are laminated portions in which a plurality of thin steel plates are laminated in the axial direction at a portion where the movable iron core is attracted to the magnetized stationary iron core and collides with each other. An electromagnetic switch characterized in that is provided. The electromagnetic switch according to claim 1,
The movable iron core or the fixed iron core constituting the laminated part is provided with a boss part for holding and fixing the laminated part,
The plurality of thin steel plates are each formed in a ring shape having a round hole in the center,
In the state where the plurality of thin steel plates are overlapped, the laminated portion fits the boss portion on the inner periphery of the round hole, and the inner peripheral side of the plurality of thin steel plates is pressed or caulked. An electromagnetic switch, wherein the electromagnetic switch is fixed to the boss portion, and the outer peripheral sides of the plurality of thin steel plates are overlapped in a state where the thin steel plates are separated from each other. The electromagnetic switch according to claim 1 or 2,
The electromagnetic switch according to claim 1, wherein a resin member having a thickness of 1/10 or less of a thickness of the thin steel plate is interposed between the thin steel plate and the laminated portion. The electromagnetic switch according to any one of claims 1 to 3,
The fixed iron core is composed of a base portion arranged to face the movable iron core, and an annular disk portion that fits on an outer periphery of the base portion and holds the base portion. An electromagnetic switch comprising a stack of thin steel plates.   An automobile starter equipped with any one of the electromagnetic switches according to claim 1.

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