JP2018044466A - Starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starter 1 which is reducible in a cost and a size by performing three different operations of the push-out, come-off prevention and pull-back of a pinion with a simple configuration.SOLUTION: A starter comprises a relative rotation regulation device for regulating the relative rotation of a planetary gear 9 and an inner gear 8 when pulling back a pinion. The relative rotation regulation device has a pair of opposing parts which oppose a radial direction between a first magnetic member 26 which rotates integrally with a planetary carrier 11 and a second magnetic member 29 which rotates integrally with the inner gear 8, and third protrusive teeth 26b, 29b are relatively arranged at the opposing parts. When electricity is carried to a first coil 28 possessed by a first electromagnetic device and a second coil 3 possessed by a second electromagnetic device, a magnetic suction force acts between the third protrusive teeth 26b, 29b, the first magnetic member 26 and the second magnetic member 29 are thereby magnetically connected to each other, the relative rotation of both the members is regulated, and as a result, the planetary gear 9 and the inner gear 8 are integrally rotate.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a starter for starting an engine.

  Currently, in low voltage starters installed in many automobiles, the pinion gear (hereinafter referred to as “pinion”) is generally pushed out using a solenoid attracting force. However, solenoids account for a large proportion of the starter's physique, and are becoming solenoid-less from the standpoint of miniaturization. In view of this, the present applicant has proposed a starter (see Patent Document 1) in which a power split mechanism using a planetary gear device and a cylindrical cam mechanism that imparts an axial longitudinal motion to a pinion are combined. This starter can push out the pinion using the rotational force of the motor without using a conventional solenoid. In addition, by adopting an electromagnetic clutch device that can magnetically couple the clutch plate connected to the planet carrier and the motor rotating plate connected to the motor shaft, the rotation direction of the motor can be changed when the pinion is pushed out and pulled back. A technique is disclosed that can be made in the same direction without reversing.

  In the starter of Patent Document 1, when the relative rotational speed of the ring gear becomes faster than the pinion due to engine torque fluctuation during cranking, a return force is applied to the pinion via the cylindrical cam mechanism, so that the pinion may be detached from the ring gear. On the other hand, the present applicant has proposed a starter (see Patent Document 2) equipped with a rotation regulating device that can prevent the pinion from detaching from the ring gear by regulating the rotation of the cylindrical cam mechanism during cranking.

Japanese Patent Application No. 2016-23461 Japanese Patent Application No. 2006-119940

However, the starter disclosed in Patent Document 2 is a first electromagnetic device used when pushing out the pinion, a second electromagnetic device used during cranking, and a third used when pulling back the pinion. And an electromagnetic device. In Patent Document 2, the first electromagnetic device is called an electromagnetic brake device, the second electromagnetic device is called a rotation regulating device, and the third electromagnetic device is called an electromagnetic clutch device. In other words, three electromagnetic devices are provided to realize three different operations: pinion extrusion, pinion detachment prevention, and pinion pullback. Nevertheless, there is a problem that sufficient miniaturization cannot be achieved.
The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce costs by realizing three different operations of pinion extrusion, detachment prevention, and pullback with a simpler configuration. Another object is to provide a starter that can be miniaturized.

  The starter of the present invention according to claim 1 is a motor that generates torque upon receiving electric power, a sun gear provided on a rotating shaft of the motor, and is disposed concentrically with the rotation center of the sun gear so as to be rotatable. A planetary gear device configured to include an internal gear provided, and a planetary gear meshing with the sun gear and the internal gear and capable of rotating and revolving, and the revolving motion of the planetary gear is transmitted and rotated. An output shaft, a pinion that is spline-fitted to the outer periphery of the output shaft and is provided to be movable on the shaft of the output shaft, and a cam cylinder connected to the internal gear. It has a pinion moving mechanism that converts it into linear motion in the axial direction and transmits it to the pinion, and a first coil that generates a magnetic force when energized, and pushes the pinion toward the ring gear of the engine A first electromagnetic device that restricts the revolving motion of the planetary gear using the magnetic force generated by the first coil, and a second coil that generates a magnetic force when energized. Using a magnetic force generated by the first coil and the second coil when the pinion is separated from the ring gear and pulled back by using a second electromagnetic device that restricts the rotation of the internal gear using the generated magnetic force. A relative rotation restricting device for restricting relative rotation between the planetary gear and the internal gear, wherein the first electromagnetic device and the second electromagnetic device are disposed between the first coil and the second coil. A part of the fixed magnetic path is shared.

In the starter of the present invention, the revolving motion of the planetary gear is restricted by the first electromagnetic device, the rotation of the motor is transmitted to the internal gear, and the cam cylinder rotates to push the pinion toward the ring gear. After the pinion meshes with the ring gear, the rotation of the internal gear and the rotation of the cam cylinder are restricted by the second electromagnetic device, thereby preventing the pinion from being detached from the ring gear during cranking. After the engine is started, when the relative rotation restricting device restricts the relative rotation between the planetary gear and the internal gear, the planetary gear and the internal gear rotate integrally by receiving the rotation of the motor. At this time, the rotation direction of the internal gear rotates in the opposite direction to that when the pinion is pushed out toward the ring gear, that is, rotates in the same direction as the rotation direction of the motor, so that a return force is applied to the pinion by the pinion moving mechanism, Is pulled away from the ring gear.
As described above, the relative rotation restricting device is configured by combining the first coil and the second coil with the first electromagnetic device and the second electromagnetic device without having a unique coil. Thereby, three different operations of pushing out the pinion, preventing separation from the ring gear, and pulling back can be realized with only two electromagnetic devices (first electromagnetic device and second electromagnetic device).

1 is a sectional view of a starter according to Embodiment 1. FIG. 1 is an axial front view of a planetary gear device according to a first embodiment. It is a disassembled perspective view which shows the structure of the pinion movement mechanism which concerns on Example 1. FIG. It is sectional drawing (A section sectional drawing shown in FIG. 1) containing the 1st electromagnetic device which concerns on Example 1. FIG. It is sectional drawing containing the 2nd electromagnetic device which concerns on Example 1 (A section sectional drawing shown in FIG. 1). 1 is a cross-sectional view (a cross-sectional view of a portion A shown in FIG. 1) including a relative rotation restricting device according to Embodiment 1. FIG. It is sectional drawing explaining the structure of the relative rotation control apparatus which concerns on Example 2. FIG. It is sectional drawing explaining the structure of the relative rotation control apparatus which concerns on Example 3. FIG.

  The mode for carrying out the present invention will be described in detail with reference to the following examples.

[Example 1]
A starter 1 (see FIG. 1) according to the first embodiment includes a motor 2, a planetary gear device, an output shaft 3, a clutch, a pinion 4, a pinion moving mechanism, a first electromagnetic device, a second electromagnetic device, and a relative rotation described below. It is configured to include a regulation device.
The motor 2 includes a field element 5 that forms a magnetic field, an armature 6 having a commutator (not shown) at the end of the motor shaft 2a, and an outer periphery of the commutator as the armature 6 rotates. This is a DC commutator motor composed of a sliding brush (not shown) or the like.
As shown in FIG. 2, the planetary gear device includes a sun gear 7 provided on the motor shaft 2a, an internal gear 8 disposed concentrically with the rotation center of the sun gear 7, and a sun gear 7 A planetary gear 9 that meshes with the gear 8 and can rotate and revolve, and a planet carrier 11 that rotatably supports the planetary gear 9 via a rotation shaft 10.

As shown in FIG. 1, the clutch is disposed in an outer 12 configured integrally with the planet carrier 11, an inner 13 provided at an end of the output shaft 3 on the motor side (right side in FIG. 1), and a cam chamber. This is a well-known one-way clutch that transmits torque from the outer 12 to the inner 13 via the roller 14 and blocks torque transmission from the inner 13 to the outer 12.
The output shaft 3 is disposed on the same axis as the motor shaft 2a and is rotatably supported. A male-side twisted spline 3a is formed at a substantially central portion in the axial direction.
As shown in FIG. 3, the pinion 4 has a female-side twisted spline 4 a formed on the inner periphery, and the twisted spline 4 a meshes with the twisted spline 3 a of the output shaft 3 so as to be movable on the shaft of the output shaft 3. Is done.

The pinion moving mechanism includes a cam cylinder 16 having a cam groove 15, a fixing member (described later) having a straight groove 17 that intersects the cam groove 15 in the axial direction, an extrusion collar 18 assembled to the pinion 4, and the extrusion collar. The cam pin 19 etc. which are hold | maintained at 18 and are fitted to the cam groove 15 and the straight groove 17 are provided.
The cam cylinder 16 has a cylindrical shape that is arranged extending in the axial direction on the outer periphery of the pinion 4, and is rotatably held on a cylindrical inner peripheral surface formed in the starter housing 20. The cam groove 15 is formed at two locations facing the radial direction of the cam cylinder 16, and has a starting end on the motor side and a terminal end on the counter motor side at different positions in the circumferential direction of the cam cylinder 16. Toward the circumferential direction of the cam cylinder 16. The cam cylinder 16 is connected to the internal gear 8 via an engagement plate 21 described below, and is configured to rotate integrally with the internal gear 8.

The engagement plate 21 has a large-diameter cylindrical portion 21a that engages with the internal gear 8, and a small-diameter cylindrical portion 21b that engages with the cam cylinder 16, and the outer periphery of the small-diameter cylindrical portion 21b is a bearing 22 (see FIG. 1). ) To be rotatably supported by the center case 23.
The large-diameter cylindrical portion 21a is formed with positioning grooves 21c at a plurality of locations in the circumferential direction, and positioning protrusions 8a provided on the internal gear 8 are fitted into the positioning grooves 21c so that the internal gear 8 and the engagement plate 21 are Rotation is regulated.
The small-diameter cylindrical portion 21 b is provided with an uneven shape 21 d on the entire circumference, and the uneven shape 21 d and the uneven shape 16 b provided on the bottom surface 16 a of the cam cylinder 16 are fitted to each other, so that the engagement plate 21 and the cam cylinder 16 Relative rotation is restricted.

The fixing member is a starter housing 20, and as shown in FIG. 3, straight grooves 17 are formed at two locations facing the radial direction of the cylindrical inner peripheral surface. The straight groove 17 is open on the motor side in the axial direction and closed on the non-motor side.
The extrusion collar 18 is arranged at the end of the pinion 4 on the motor side, the relative rotation with the pinion 4 is restricted, and the extrusion collar 18 is assembled so as not to move in the axial direction. The extrusion collar 18 is inserted into the inner periphery of the cam cylinder 16 so as to be rotatable relative to the cam cylinder 16 and slidable in the axial direction, and pin insertion holes 18a are formed at two locations facing each other in the radial direction. The
One end of the cam pin 19 is inserted into the pin insertion hole 18 a, and the other end protrudes outward in the radial direction from the pin insertion hole 18 a and is fitted in the cam groove 15 and the straight groove 17.

As shown in FIG. 4, the first electromagnetic device includes a first pin 26 (see FIG. 2) provided on the planet carrier 11 or a first magnetic member 26 that is fixed to the rotation shaft 10 with a bolt 25 and rotates integrally with the planet carrier 11. And a first fixed magnetic path portion 27 disposed so as to face the first magnetic member 26 in a non-contact manner, and a first coil 28 that generates a magnetic force when energized.
The first magnetic member 26 is formed, for example, in a hollow disk shape from a ferromagnetic material such as iron, and an uneven shape is continuously provided in the circumferential direction on the end surface on the motor side in the axial direction.
The first fixed magnetic path portion 27 is formed of a ferromagnetic material such as iron, like the first magnetic member 26, and an uneven shape is continuously provided in the circumferential direction on the facing surface facing the first magnetic member 26 in the axial direction. It has been. Hereinafter, the concavo-convex convex portion provided on the first magnetic member 26 is referred to as a first protruding tooth 26a, and the concavo-convex convex portion provided on the first fixed magnetic path portion 27 is referred to as a first protruding tooth 27a.

As shown in FIG. 5, the second electromagnetic device includes a second magnetic member 29 that is fixed to a motor-side end surface of the internal gear 8 with a bolt or the like and rotates integrally with the internal gear 8. A second fixed magnetic path portion 30 disposed to face the contact and a second coil 31 that generates a magnetic force when energized are configured.
For example, the second magnetic member 29 is formed in a ring shape from a ferromagnetic material such as iron, and an uneven shape is continuously provided in the circumferential direction on the end surface on the motor side in the axial direction.
The second fixed magnetic path portion 30 is formed of a ferromagnetic material such as iron, like the second magnetic member 29, and an uneven shape is continuously provided in the circumferential direction on the facing surface facing the second magnetic member 29 in the axial direction. It has been. Hereinafter, the concave and convex portion provided on the second magnetic member 29 is referred to as a second protruding tooth 29a, and the concave and convex portion provided on the second fixed magnetic path portion 30 is referred to as a second protruding tooth 30a.
The first electromagnetic device and the second electromagnetic device include a first fixed magnetic path portion 27 and a second fixed magnetic path portion 30 that are integrally provided between the first coil 28 and the second coil 31. The shared magnetic path is formed in

As shown in FIG. 6, the relative rotation restricting device has a pair of opposed portions arranged in a non-contact manner in the radial direction between the first magnetic member 26 and the second magnetic member 29, and Concave and convex shapes are respectively provided continuously on the entire circumference at the opposing portions. Hereinafter, the concavo-convex convex portion provided at the facing portion of the first magnetic member 26 is referred to as a third protruding tooth 26b, and the concavo-convex convex portion provided at the opposing portion of the second magnetic member 29 is referred to as a third protruding tooth 29b. That is, the first magnetic member 26 is provided with the first protruding teeth 26a and the third protruding teeth 26b, and the second magnetic member 29 is provided with the first protruding teeth 29a and the third protruding teeth 29b.
In this relative rotation restricting device, the magnetic flux generated by energizing the first coil 28 and the second coil 31 is between the third projecting teeth 26 b of the first magnetic member 26 and the third projecting teeth 29 b of the second magnetic member 29. It is comprised so that a magnetic attraction force may work between mutual 3rd protrusion teeth 26b and 29b by flowing in the same direction.

Subsequently, the operation of the starter 1 will be described.
The first coil 28 is energized in response to the engine start request. When a magnetic field is generated around the first coil 28 by energizing the first coil 28, the magnetic flux ΦA returns between the first magnetic member 26 and the first fixed magnetic path portion 27 as shown in FIG. 4. A loop is formed. The magnetic flux ΦA returning through the magnetic flux loop tends to flow between the first projecting teeth 26a and 27a having the smallest magnetic resistance between the first magnetic member 26 and the first fixed magnetic path portion 27. A magnetic attractive force acts between the first projecting teeth 26a and 27a. The first magnetic member 26 and the first fixed magnetic path portion 27 are magnetically coupled by this magnetic attraction force, so that the rotation of the first magnetic member 26 is restricted, and further the planet on which the first magnetic member 26 is fixed. The rotation of the carrier 11 is restricted.

  When the motor 2 is energized while the rotation of the planetary carrier 11 is restricted, the rotation of the motor shaft 2a is transmitted from the sun gear 7 to the planetary gear 9, and the planetary gear 9 rotates around the rotation shaft 10 (rotation). To do. As a result, the internal gear 8 rotates in the direction opposite to the rotation direction of the sun gear 7, that is, in the direction opposite to the rotation direction of the motor 2, and the rotation of the internal gear 8 is transmitted to the cam cylinder 16 via the engagement plate 21. The When the cam cylinder 16 rotates, the rotational motion is converted into an axial linear motion by the pinion moving mechanism and is transmitted to the pinion 4, thereby pushing the pinion 4 in the axial direction. As a result, the pinion 4 moves toward the ring gear (not shown) attached to the crankshaft of the engine while rotating on the output shaft 3 along the torsion spline 3a.

  After the pinion 4 is engaged with the ring gear, the energization of the first coil 28 is stopped and the second coil 31 is energized. When energization of the first coil 28 is stopped, the magnetic coupling force acting between the first magnetic member 26 and the first fixed magnetic path portion 27 disappears, so that the rotation restriction of the planet carrier 11 is released. The Further, when a magnetic field is generated around the second coil 31 by energizing the second coil 31, the magnetic flux ΦB is circulated between the second magnetic member 29 and the second fixed magnetic path portion 30 as shown in FIG. Magnetic flux loops are formed. The magnetic flux ΦB flowing back through the magnetic flux loop tends to flow between the second projecting teeth 29a and 30a having the smallest magnetic resistance between the second magnetic member 29 and the second fixed magnetic path portion 30. A magnetic attractive force acts between the second projecting teeth 29a and 30a. The magnetic attraction force magnetically couples the second magnetic member 29 and the second fixed magnetic path portion 30 to restrict the rotation of the second magnetic member 29.

  By restricting the rotation of the second magnetic member 29, the rotation of the internal gear 8 to which the second magnetic member 29 is fixed is restricted. When the rotation of the internal gear 8 is restricted and the rotation restriction of the planet carrier 11 is released, the torque of the motor 2 is taken out by the planet carrier 11 and the planet carrier 11 rotates in the same direction as the rotation direction of the motor 2. To do. The rotation of the planet carrier 11 is transmitted to the output shaft 3 through the clutch, and the pinion 4 rotates integrally with the output shaft 3 to rotate the ring gear, thereby cranking. At the time of this cranking, the rotation of the cam cylinder 16 connected to the internal gear 8 via the engagement plate 21 is restricted, so that the relative rotational speed of the ring gear becomes faster than the pinion 4 due to engine torque fluctuations. However, it is possible to prevent the pinion 4 from being detached from the ring gear.

  After the engine starts after cranking, the first coil 28 is energized again. At this time, energization to the second coil 31 is maintained. When both the first coil 28 and the second coil 31 are energized, a magnetic field is formed in the direction in which the magnetic fluxes cancel each other in the shared magnetic path portion of the first electromagnetic device and the second electromagnetic device. A synthetic magnetic field is generated so as to surround the second coil 31 and the second coil 31. As a result, as shown in FIG. 6, a magnetic flux loop in which the magnetic flux ΦC circulates between the first fixed magnetic path portion 27, the first magnetic member 26, the second magnetic member 29, and the second fixed magnetic path portion 30 is formed. Is done. The magnetic flux ΦC flowing back through the magnetic flux loop tends to flow between the third projecting teeth 26b and 29b having the smallest magnetic resistance between the first magnetic member 26 and the second magnetic member 29. A magnetic attractive force acts between the third projecting teeth 26b and 29b.

  Since the first magnetic member 26 and the second magnetic member 29 are magnetically coupled by this magnetic attraction force, the relative rotation of both is restricted, so that the planetary gear 9 and the internal gear according to the rotation of the sun gear 7. 8 and rotate together. At this time, the rotation direction of the internal gear 8 rotates in the direction opposite to that when the pinion 4 is pushed out toward the ring gear, that is, in the same direction as the rotation direction of the motor 2. The rotation of the internal gear 8 is transmitted to the cam cylinder 16 through the engagement plate 21, and a return force is applied to the pinion 4 from the pinion moving mechanism, so that the pinion 4 is detached from the ring gear and is at a stationary position (shown in FIG. 1). To the position). In the process of pulling back the pinion 4, the relative rotation restriction device restricts the relative rotation between the first magnetic member 26 and the second magnetic member 29, and the planetary gear 9 and the internal gear 8 rotate integrally. There is no need to rotate in the reverse direction of cranking. That is, since it is not necessary to switch the rotation direction of the motor 2 between when the pinion 4 is pushed out and when it is pulled back, the DC commutator motor 2 can be employed.

[Effect of Example 1]
The starter 1 according to the first embodiment includes a relative rotation restricting device that restricts relative rotation between the first magnetic member 26 and the second magnetic member 29 when the pinion 4 is pulled back after the engine is started. This relative rotation restricting device is configured using the first coil 28 included in the first electromagnetic device and the second coil 31 included in the second electromagnetic device without having a unique coil. That is, the only component provided as a relative rotation restricting device is the third projecting tooth 26b provided on the first magnetic member 26 and the third projecting tooth 29b provided on the second magnetic member 29. The push-out of the pinion 4, the ring gear The three different operations of preventing separation and pullback can be realized by switching on and off the two coils (first coil 28 and second coil 31). As a result, compared with the prior art of Patent Document 2, it can be configured more simply, so that the cost can be reduced and the size can be reduced.

Hereinafter, other embodiments according to the present invention will be described.
In addition, what shows the components and configurations common to the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted (see the first embodiment).
[Example 2]
As shown in FIG. 7, the relative rotation restricting device of the second embodiment is configured so that the third projecting teeth 26 b provided on the first magnetic member 26 and the third projecting teeth 29 b provided on the second magnetic member 29 are opposed to each other in the axial direction. It is an example of arrangement. Even with this configuration, the same effect as in the first embodiment can be obtained.

Example 3
In the relative rotation restricting device of the third embodiment, as shown in FIG. 8, the third projecting teeth 29 b provided on the second magnetic member 29 are configured by the gear portion of the internal gear 8 (the portion that meshes with the gear portion of the sun gear 7). It is an example. That is, the entire internal gear 8 is made of a ferromagnetic material such as iron, and the gear portion of the internal gear 8 is used as the third protruding teeth 29b. Even with this configuration, the same effect as in the first embodiment can be obtained.

[Modification]
In the first and second embodiments, the second magnetic member 29 is configured separately from the internal gear 8 and fixed to the internal gear 8 with a bolt or the like. For example, as in the third embodiment, the internal gear 8 Can be made of a ferromagnetic material such as iron, and the second projecting tooth 29a and the third projecting tooth 29b can be provided on a part of the internal gear 8 (the meat part other than the gear part).
In the first embodiment, the cam groove 15 is formed in the cam cylinder 16 and the straight groove 17 is formed on the cylindrical inner peripheral surface of the starter housing 20, but the straight groove 17 is formed in the cam cylinder 16 and the starter housing is formed. The cam groove 15 may be formed on the inner circumferential surface of the 20 cylinders.

1 starter 2 motor 3 output shaft 4 pinion 7 sun gear (planetary gear unit) 8 internal gear (planetary gear unit)
9 Planetary gear (Planetary gear device)
16 Cam cylinder (Pinion moving mechanism)
26 1st magnetic member 26a 1st protrusion tooth 26b of 1st magnetic member 3rd protrusion tooth (relative rotation control apparatus) of 1st magnetic member
27 1st fixed magnetic path part 27a 1st protrusion tooth 28 of 1st fixed magnetic path part 1st coil (1st electromagnetic device) 29 2nd magnetic member 29a 2nd protrusion tooth 29b of 2nd magnetic member 3rd of 2nd magnetic member Tooth (relative rotation regulating device)
30 2nd fixed magnetic path part 30a 2nd protrusion 31 of 2nd fixed magnetic path part 2nd coil (2nd electromagnetic device)

Claims (4)

A motor (2) that generates torque upon receipt of electric power;
A sun gear (7) provided on the rotation shaft of the motor, an internal gear (8) disposed concentrically with the rotation center of the sun gear and rotatably provided, and the sun gear and the internal gear mesh with each other to rotate. A planetary gear device comprising a planetary gear (9) capable of motion and revolution,
An output shaft (3) that rotates by transmission of the revolution of the planetary gear;
A pinion (4) that is spline-fitted to the outer periphery of the output shaft so as to be movable on the shaft of the output shaft;
A pinion moving mechanism that has a cam cylinder (16) connected to the internal gear, converts the rotational movement of the cam cylinder into an axial linear movement, and transmits the linear movement to the pinion;
A first coil (28) that generates a magnetic force when energized, and that controls the revolving motion of the planetary gear using the magnetic force generated by the first coil when the pinion is pushed out toward the ring gear of the engine. One electromagnetic device;
A second electromagnetic device that has a second coil (31) that generates a magnetic force when energized, and that controls the rotation of the internal gear using the magnetic force generated by the second coil during cranking;
A relative rotation restricting device for restricting relative rotation between the planetary gear and the internal gear by using magnetic force generated by the first coil and the second coil when the pinion is pulled away from the ring gear and pulled back; ,
The first electromagnetic device and the second electromagnetic device are a starter (1) in which a part of both fixed magnetic path portions (27, 30) are shared between the first coil and the second coil. The starter according to claim 1,
The first electromagnetic device includes a first magnetic member (26) that rotates in conjunction with the revolving motion of the planetary gear, and a first fixed magnetic path portion (non-contactingly opposed to the first magnetic member) ( 27), and the first magnetic member and the first fixed magnetic path portion are provided with a plurality of first projecting teeth (26a, 27a) on opposite surfaces of the first magnetic member and the first fixed magnetic path portion, respectively, by energizing the first coil. A magnetic coupling force acts between the first magnetic member and the first fixed magnetic path portion by causing a magnetic flux to flow between the first protruding teeth of each other,
The second electromagnetic device includes a second magnetic member (29) that rotates integrally with the internal gear, and a second fixed magnetic path portion (30) that is disposed so as to face the second magnetic member in a non-contact manner. Have
The second magnetic member and the second fixed magnetic path portion are provided with a plurality of second projecting teeth (29a, 30a) on opposite surfaces of each other, and the second projecting teeth are mutually energized by energizing the second coil. A magnetic coupling force acts between the second magnetic member and the second fixed magnetic path portion by causing a magnetic flux to flow between them,
The relative rotation restricting device has a pair of opposing portions arranged in a non-contact manner between the first magnetic member and the second magnetic member, and each of the opposing portions has a plurality of third portions. Protruding teeth are provided, and magnetic flux generated by energizing the first coil and the second coil flows in the same direction between the third projecting teeth, so that the first magnetic member and the second magnetic member A starter characterized by a magnetic coupling force between the two. The starter according to claim 2,
3. The starter according to claim 1, wherein the third projecting tooth provided on the second magnetic member is constituted by a gear portion of the internal gear. In the starter as described in any one of Claims 1-3,
The motor is a DC commutator motor.

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