JPH11153074A - Starter of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve installing workability by constituting a starter so as to fix/hold a seal member by regulating/positioning the outer periphery of a seal main part on a fixed core of an electromagnetic driving unit arranged below by the inner periphery of an annular calking part at installing time of the electromagnetic driving unit and a starting switch. SOLUTION: In this starter having an electromagnetic driving unit 18 to exhibit electromagnetic force to drive a pinion in the direction for meshing with a starting ring gear, a ring plate-like collar part 81b is arranged in a fixed core 81 in the electromagnetic driving unit 18. A yoke 86 as one constitutive element of a solenoid case is formed by arranging an annular step part 86a to receive an outer peripheral edge part of the collar part 81b, a thin cylindrical part 86b to surround the collar part 81b by continuing with a step part 86a and an annular calking part 86c. A seal member 98 having the outer periphery regulated by the inner periphery of this annular calking part 86c is arranged so as to be sandwiched between a switch case 441 and the fixed core 81, and the seal member 98 is held in a prescribed position on the fixed core 81.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuation switch which operates in response to the operation of an electromagnetic drive unit capable of exerting an electromagnetic force for driving a pinion into engagement with a starting ring gear, thereby transmitting power to the pinion. The present invention relates to an engine starting device that starts a starting motor by a switching operation of a starting switch.

[0002]

2. Description of the Related Art Conventionally, such an engine starting device is already known, for example, from Japanese Patent Application Laid-Open No. 7-54740. In this device, as shown in FIG.
A tapered surface 105 having a smaller diameter toward the start switch 19 'is formed on the outer peripheral portion of 1' so that one end of the yoke 86 'in the electromagnetic drive unit 18' partially projects from the fixed core 81 '. The tapered surface 10
5 is caulked. On the surface of the start switch 19 'facing the fixed core 81' of the switch case 44 ', a groove 106 having a substantially M-shaped cross section is provided, and a seal member 107 having a rectangular cross section is provided.
Is inserted into the groove 106, and the tip of the caulked portion 108 of the yoke 86 'comes into contact with the sealing member 107 so as to bite, thereby sealing between the fixed core 81' and the switch case 44 '. I have.

[0003]

By the way, when assembling the electromagnetic drive unit 18 'and the start switch 19',
The switch case 44 'of the activation switch 19' is assembled from above the electromagnetic drive unit 18 'arranged below. According to the above-mentioned conventional sealing structure, the caulking portion 108 of the yoke 86' is sealed after assembly. Since the seal member 107 is bitten into the member 107, when the seal member 107 is fixedly held in the groove 106 before assembly, the seal member 107 is twisted due to the bite of the caulking portion 108,
It is difficult to insert and hold the seal member 107 in the groove 106 at the time of assembling, and the assembling work of the electromagnetic drive unit 18 'and the start switch 19' becomes complicated.

[0004] When the caulking portion 108 bites into the seal member 107, a local stress is applied to the seal member 107, and the heat aging resistance of the seal member 107 is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in view of the above circumstances. It is possible to improve the assembling workability and the heat aging resistance of a seal member, and to provide an engine having a seal structure between an electromagnetic drive unit and a start switch. It is intended to provide a starting device.

[0006]

In order to achieve the above object, an invention according to claim 1 comprises a fixed core, a movable core opposed to the fixed core so as to be able to approach and separate from the fixed core, and a fixed core. And a coil assembly in which a coil is wound around a bobbin surrounding the movable core, and one end is caulked to the outer peripheral edge of the fixed core to cover the coil assembly, and the other end is connected to the movable core. An electromagnetic drive unit having a yoke that is magnetically coupled and capable of exerting an electromagnetic force for driving the pinion in a direction meshing with the starting ring gear; and a sealing member interposed between the fixed core and the fixed core. A start switch that includes a switch case to be fastened and that starts a start motor that conducts in response to an operation of approaching the movable core to the fixed core and transmits power to the pinion; Wherein the fixed core has a base surrounded by one end of the coil assembly, and a radially outward projection from the base opposed to one end of the coil assembly and a constant thickness. The yoke has an annular stepped portion that receives the inner surface of the outer peripheral edge of the flange, and the base end is connected to the outer peripheral edge of the stepped portion. The thin cylindrical portion surrounding the flange portion and the outer peripheral edge portion of the flange portion are clamped so as to be sandwiched between the step portion and the distal end portion of the thin cylindrical portion so as to form a substantially L-shaped cross section. An annular caulking portion is provided on the outer peripheral edge outer surface of the flange portion so as to be engaged over the entire circumference. Disk-shaped seal main part, and radially outward from the seal main part Characterized in that it consists of an annular projecting portion that is sandwiched between the switch case and the annular crimped portion out.

According to the configuration of the first aspect of the present invention, when the electromagnetic drive unit and the start switch are assembled, the outer periphery of the seal main portion is formed in an annular shape on the fixed core of the electromagnetic drive unit disposed below. The seal member can be fixedly held on the fixed core so as to be regulated and positioned on the inner periphery of the caulked portion, and the assembling workability can be improved. Further, the seal member is formed in a disk shape having an annular protrusion, and includes a switch case,
Since the sealing member is sandwiched over a relatively large area between the fixed core and the annular caulked portion, it is possible to prevent the local stress from being applied to the sealing member and to improve the heat aging resistance of the sealing member.

According to the second aspect of the invention, the thin cylindrical portion is unevenly engaged with the outer peripheral surface of the flange portion of the fixed core at at least one position along the circumferential direction of the thin cylindrical portion. The fixed core sandwiched between the portion and the annular caulking portion can be prevented from rotating with respect to the yoke,
Damage to the seal member due to rotation of the fixed core and damage to the coil conductor that penetrates through the fixed core and is led out can be prevented.

In order to further achieve the above object, the invention according to claim 3 provides a fixed core and a fixed core close to the fixed core.
A movable core that is arranged opposite to the fixed core to enable separation
A coil assembly in which a coil is wound around a bobbin surrounding a part of the fixed core and the movable core, and one end is caulked to the outer peripheral edge of the fixed core to cover the coil assembly and the other end is movable. An electromagnetic drive unit having a yoke magnetically coupled to the core and capable of exerting an electromagnetic force for driving the pinion in a direction meshing with the starting ring gear; and a fixing member interposed between the fixed core and the fixed core. A start switch that is provided with a switch case that is fastened to the core, and that activates a start motor that conducts in response to the proximity operation of the movable core to the fixed core to transmit power to the pinion; The fixed core has a base surrounded by one end of the coil assembly, and projects radially outward from the base in opposition to one end of the coil assembly. A ring-shaped flange having a constant thickness, wherein the yoke includes an annular step receiving the inner surface of the outer peripheral edge of the flange, and a base end connected to the outer peripheral edge of the step. The thin cylindrical portion surrounding the flange portion and the distal end portion of the thin cylindrical portion are sandwiched between the outer peripheral edge of the flange portion and the step portion in a substantially L-shaped cross section. An annular caulked portion is provided which is caulked and is engaged with the outer peripheral edge outer surface of the flange portion over the entire circumference. The switch case is provided on a surface facing the fixed core.

According to the configuration of the third aspect of the present invention, by setting the inner diameter of the O-ring in a natural state slightly smaller than the inner diameter of the annular groove, the electromagnetic drive unit and the start switch When assembling, O
The O-ring can be fixedly held in the switch case by elastically fitting the ring, so that the assembling workability can be improved. The O-ring is in contact with the substantially flat annular caulking portion, and the O-ring has a relatively small volume collapse allowance and can obtain a large sealing surface pressure. , The heat aging resistance of the O-ring can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an engine starting device.
FIG. 2 is an enlarged longitudinal sectional view of the electromagnetic drive unit and the start switch, FIG. 3 is an enlarged view of a portion viewed in the direction of arrow 3 in FIG. 2, and FIG. 4 is a sectional view showing a state where the yoke and the fixed core are engaged with the concave and convex.

First, in FIG. 1, a rotation shaft 11 of a starting motor 10 is connected to a pinion drive shaft 1 via a gear reduction mechanism 12.
3 The pinion drive shaft 13 is connected to the clutch outer 14 a of the overrunning clutch 14 so as to allow relative movement in the axial direction.
3 and a sleeve 15 fixedly connected to the clutch inner 14b of the overrunning clutch 14
In addition, a pinion 16 that can mesh with a starting ring gear 17 for starting the engine is fixedly provided.

On the side adjacent to the starting motor 10, the overrunning clutch 1 is connected to the pinion drive shaft 13.
An electromagnetic drive unit 18 for relatively moving the sleeve 4 and the sleeve 15 in the axial direction is disposed, and the pinion 16 is started by driving the overrunning clutch 14 and the sleeve 15 in the axial direction by the electromagnetic drive unit 18. It moves between a retracted position (position indicated by a solid line in FIG. 1) in which engagement with the ring gear 17 is released and a forward position (position indicated by a chain line in FIG. 1) in mesh with the ring gear 17 for starting. . The electromagnetic drive unit 18 is provided with a start switch 19 for controlling the operation of the starter motor 10 according to the operation of the electromagnetic drive unit 18.

The casing 20 of the starting motor 10 comprises a cylindrical yoke 21 sandwiched between a front bracket 22 and a rear bracket 23. The two brackets 22, 23 are mutually fastened by a plurality of through bolts 24. Is done. A stator 25 is fixed to the inner surface of the yoke 22 and a rotor 26 coaxially surrounded by the stator 25.
Is rotatably supported by a front bracket 22 and a rear bracket 23, respectively.

A commutator 27 is provided on a portion of the rotor 26 on the side of the rear bracket 23, and a plurality of brush holders 28, which are fixedly supported on the inner surface of the rear bracket 23, are elastically moved in a direction in which the brush holder 28 slides on the commutator 27. The brushes 29 to be urged are respectively held.

The front bracket 22 of the starting motor 10
A partly open end face of the protective case 30 opened to the starting motor 10 and the electromagnetic drive unit 18 is fastened by bolts 31. Between the protective case 30 and the front bracket 22, an outer surface of the front bracket 22 is provided. A flat cover member 34 forming a gear chamber 33 in cooperation with the provided recess 32 is sandwiched.

A solenoid case 35 of the electromagnetic drive unit 18 located on the side of the starting motor 10 is fastened to the opening end surface of the protection case 30.
Of the openings, portions other than the portion closed by the front bracket 22 and the solenoid case 35 are closed by a seal member 36. In this way, the opening of the protective case 30 is completely closed, and a sealed working chamber 38 is formed in the protective case 30.

The electromagnetic drive unit 18 has one end of the working chamber 3.
The electromagnetic force exerts an electromagnetic force that causes the movable core 39, which has entered the inside of the movable core 39, to move away from the working chamber 38 when excited, and the shaft 3 is coaxially connected to one end of the movable core 39.
9a, a spring receiving member 41 attached to the intermediate portion, and a solenoid case 35 covering one end of the movable core 39.
Between the spring receiving member 42 and the spring 43
The movable core 39 is urged by the spring 43 in a direction in which one end of the movable core 39 protrudes into the working chamber 38 side. When the coil 40 is excited, the movable core 39 moves against the spring force of the spring 43 to the position shown by the dashed line in FIG. 1 due to the electromagnetic force acting on the movable core 39.

The gear reduction mechanism 12 provided between the rotating shaft 11 of the starting motor 10 and the pinion drive shaft 13 includes a front bracket 22 of the starting motor 10 and a cover member 3.
4 is housed in a gear chamber 33 formed between the rotating shaft 11 and the outer peripheral gear 48 formed integrally with the rotating shaft 11.
The outer peripheral gear 4 is provided integrally with the pinion drive shaft 13 and
8 and an inner peripheral gear 49 meshing with the inner gear 8.

The rear end of the pinion drive shaft 13 having an axis parallel to the rotation shaft 11 is rotatably supported by the front bracket 22 at the center of the gear chamber 33. Inner peripheral gear 49
Is formed integrally with the rear end of the pinion drive shaft 13 so as to cover the outer peripheral gear 48, and the axial movement of the pinion drive shaft 13 is prevented by the front bracket 22 and the cover member 34. .

The overrunning clutch 14 is housed in the working chamber 38, and the clutch outer 14a and the clutch inner 1 are prevented from moving relative to each other in the axial direction.
4b, a plurality of rollers 52 and a plurality of springs 53 are interposed. This overrunning clutch 14
Transmits power from the clutch outer 14a to the clutch inner 14b, but allows the clutch inner 14b to idle when the rotation speed of the clutch inner 14b becomes higher than the rotation speed of the clutch outer 14a.

A tubular portion 54 coaxially surrounding the pinion drive shaft 13 is coaxially and integrally connected to the clutch outer 14a. The tubular portion 54 is connected to the pinion drive shaft 13 via, for example, a helical spline. Be linked. That is, the cylindrical portion 54, which is integral with the clutch outer 14a, allows the relative movement in the axial direction so that the pinion drive shaft 1
3 Moreover, an annular groove 54a is formed on the outer periphery of the cylindrical portion 54.

The movable core 3 in the electromagnetic drive unit 18
One end of a shift lever 56 is connected to the front end of the shaft portion 39a integrally connected to the shaft 9. This shift lever 56
The other end of the shift lever 56 is bifurcated so as to sandwich the tubular portion 54 from both sides.
The rollers 57 are pivotally supported so as to be disposed in the annular groove 54a of the cylindrical portion 54. A holder 58 is supported on the protective case 30 so as to be movable in a direction parallel to the axis of the pinion drive shaft 13, and an intermediate portion of the shift lever 56 is rotatable on the holder 58 via a pin 59. And a spring 6 is provided between the seal member 36 and the holder 58.
0 is provided. Accordingly, in response to the operation of the electromagnetic drive unit 18, the cylinder portion 54, that is, the overrunning clutch 14 is pushed out in the forward direction (the right direction in FIGS. 1 and 2). The movement prevents an excessive reaction force from acting on the electromagnetic drive unit 18 side from the cylinder portion 54, that is, the overrunning clutch 14 side.

The rear end of the sleeve 15 arranged coaxially with the pinion drive shaft 13 is integrally connected to the clutch inner 14b. The sleeve 15 has an inner end, that is, a rear end. Opened bottomed storage hole 62
The bearing metal 63 is press-fitted into the storage hole 62, and the front end of the pinion drive shaft 13 is
3 is inserted.

A stopper 65 is mounted on the pinion drive shaft 13 near the opening end of the storage hole 62, and the cylindrical portion 5
A regulating step (not shown) for regulating the forward movement of the overrunning clutch 14 and the sleeve 15 by contacting the stopper 65 is provided on the inner surface of 4.

The protective case 30 is provided with a shaft hole 67 coaxial with the sleeve 15, and the sleeve 15 penetrates the shaft hole 67 so as to be able to move in the axial direction and rotate around the axis. Sleeve 1 outside protective case 30
A pinion 16 is fixedly provided at an outer end, that is, a front end of the pin 5.

A bearing metal 70 is provided between the inner surface of the shaft hole 67 and the outer surface of the sleeve 15 to support the axial movement of the sleeve 15 and the rotation around the axis. A dust seal 74 for preventing foreign matter from entering the bearing metal 70 is provided between the sleeve 30 and the sleeve 15.

Referring also to FIG. 2, the electromagnetic drive unit 18 includes a fixed core 81, a movable core 39 that is arranged to face the fixed core 81 so as to be able to approach and separate from the fixed core 81, And a coil assembly 85 in which coils 83 and 84 are wound around a bobbin 82 surrounding a part of the movable core 39 and one end of the coil assembly 85 is caulked to the outer peripheral edge of the fixed core 81 to cover the coil assembly 85. The solenoid case 35 includes a yoke 86 having a cylindrical shape surrounding the coil assembly 85, one end of which is swaged to the outer peripheral edge of the fixed core 81, and the other of the yoke 86. A ring-shaped magnetic plate 87 joined to the ends by welding or the like is provided. A movable core 39 is slidably fitted to the center of the magnetic plate 87, so that the magnetic plate 87 is formed. The other end of the Chi yoke 86 is to be magnetically coupled to the movable core 39.

The fixed core 81 includes a cylindrical base 81a surrounded by one end of the coil assembly 85, and a flange 81b extending radially outward from the base 81a. The coil assembly 85 is formed in a ring plate shape with a constant thickness along the radial direction.
It is sandwiched between the flange portion 81b of the fixed core 81 and the magnetic plate 87.

Referring also to FIG. 3, one end of the yoke 86 has an annular step 86a for receiving the inner surface of the outer peripheral edge of the flange 81a of the fixed core 81, and an outer peripheral edge of the step 86a. A thin cylindrical portion 86b surrounding the flange portion 81b by connecting base ends thereof, and an outer peripheral edge outer surface of the flange portion 81b so as to sandwich an outer peripheral edge portion of the flange portion 81b between the step portion 86a. Is provided with an annular caulked portion 86c which is engaged over the entire circumference, and the annular caulked portion 86c is provided with a thin cylindrical portion 86b.
The thin cylindrical portion 86b is crimped inward on the inside.
Are formed so as to be continuous in a substantially L-shaped cross section.

Further, after the yoke 86 is crimped to the fixed core 81, as shown in FIG. 4, an impact force is applied to at least one portion along the circumferential direction of the thin cylindrical portion 86b by a punch 88 or the like. The protrusion 89 protruding inward from the thin-walled cylindrical portion 86b is formed by the flange portion 81b of the fixed core 81.
Will be engaged with the concave portion 90 formed on the outer surface of
The thin cylindrical portion 86b is unevenly engaged with the outer peripheral surface of the flange portion 81b of the fixed core 81.

Referring again to FIG. 2 and FIG.
On the opposite side of the fixed core 31, the start switch 1
9 switch case 44₁Is fastened to the switch case
44 ₁A contact chamber 91 is formed between the fixed core 81 and the fixed core 81.
It is.

The start switch 19 has a shaft 39b coaxially and integrally connected to the movable core 39 of the electromagnetic drive unit 18, and is mounted on the shaft 39b so as to be capable of relative movement in the axial direction. Movable contact 4 accommodated in 91
5, a substantially C-shaped retaining ring 92 attached to the end of the shaft 39b in the contact chamber 91 so as to prevent the movable contact 45 from being detached from the shaft 39b, and the movable contact 45 is stopped. Wheel 9
A spring 93 is provided between the movable contact 45 and the shaft portion 39b by exerting a spring force biasing to the second side, and the switch case 44 ₁ is opposed to the movable contact 45 in the contact chamber 91.
And a pair of fixed contacts 46 and 47 fixed to the first and second contacts.

The shaft 39b is provided on the base 81a of the fixed core 81.
The movable contact 45, which is movably supported in the axial direction and penetrates the base 81a, is formed in a long flat plate shape along one diameter line of the shaft 39b, and is supported by an insulating material such as a synthetic resin. It is mounted on the shaft portion 39b via a member 94 so as to be movable in the axial direction. The support member 94 is provided at one end of a cylindrical portion 94a into which the shaft portion 83b is slidably fitted.
A flange 94b projecting outward in the radial direction of the movable contact 45 is integrally provided continuously.
4a is fitted, and the flange portion 94b is brought into contact with the end surface of the movable contact 45 on the movable core 39 side.

The flange 94b of the support member 94 and the flange 94
A coil-shaped spring 93 is provided between an annular step portion 95 provided on the shaft portion 83b facing the side b, and the support member 83, that is, the movable contact 4 is provided by the spring force of the spring 93.
5 is urged in a direction away from the movable core 39.

A support plate 95 made of an insulating material is in contact with an end surface of the movable contact 45 opposite to the movable core 39, and the movable contact 45 is provided between the flange 94 b of the support member 94 and the support plate 95. Will be sandwiched between.

The retaining ring 92 attached to the shaft 39b has
A cover 96 attached to the shaft 39b is swaged to prevent the retaining ring 92 from coming off the shaft 39b, and a washer 97 is provided between the cover 96 and the support plate 95.
Is interposed.

In the start switch 19, when the electromagnetic drive unit 18 is not operated, the movable contact 45 is in a cut-off state separated from the individual contacts 46 and 47, and when the electromagnetic drive unit 18 is operated, that is, the pinion 16 is started. When the electromagnetic drive unit 18 exerts an electromagnetic force for meshing with the ring gear 17, the movable contact 45
The starting motor 10 is started by the conduction of the start switch 19 by moving to a position where the start switch 19 is resiliently contacted.

[0040] Incidentally, between the switch case 44 ₁ and the electromagnetic drive unit 18, the water to contact chamber 91 entering,
And it is intended to seal member 98 for preventing the entry of water to the electromagnetic drive unit 18 is sandwiched between, the sealing member 98, and the switch case 44 ₁ is restricted to the outer periphery at the inner periphery of the annular crimped portion 86c A disk-shaped seal main portion 98a sandwiched between the fixed cores 81;
Annular projecting portion 98b sandwiched between the switch case 44 ₁ and the annular crimped portion 86c Te projecting radially outwardly from
And the annular overhanging portion 98b has an annular caulking portion 86c.
The intrusion of water on the electromagnetic drive unit 18 side is reliably prevented by being in close contact with the entire circumference.

Next, the operation of the first embodiment will be described. The starting ring gear 17 for starting the engine is used.
The pinion 16 is fixed to the sleeve 15 outside the protective case 30. A bearing metal 70 is provided between the sleeve 15 and a shaft hole 67 provided in the protective case 30 so that the sleeve 15 can be penetrated. Since it is provided, there is no need to provide an opening in the protective case 30 for meshing the pinion 16 with the ring gear 17 for starting.
Therefore, the working chamber 38 in the protection case 30 can be formed as a closed space, and the intrusion of foreign matter into the protection case 30 is reliably prevented. The operation does not become smooth due to the influence of the invading foreign matter.

Further to the time of assembly of the electromagnetic drive unit 18 and the activation switch 19, but the switch case 44 ₁ from above the electromagnetic drive unit 18 disposed below is being fastened, this time, the switch case 44 ₁ and the electromagnetic The seal member 98 sandwiched between the drive units 18 includes a disk-shaped seal main portion 98a whose outer periphery is regulated by the inner periphery of the annular caulking portion 86c.
The seal member 98 can be fixedly held on the fixed core 81 such that the outer periphery of the seal main portion 98a is regulated and positioned by the inner periphery of the annular caulking portion 86c, thus improving the assembling workability. can do.

Moreover, the sealing member 98 is
Is intended to be formed into a disc shape having a 8b, the switch case 44 _1, the fixed core 81 and the annular crimped portion 86
Since it is sandwiched over a relatively large area between the sealing member 98 and c, it is possible to prevent local stress from being applied to the sealing member 98, and therefore, it is possible to improve the heat aging resistance of the sealing member 98.

Furthermore, since the thin cylindrical portion 86b of the yoke 86 is engaged with the outer peripheral surface of the flange portion 81b of the fixed core 81 at least at one position in the circumferential direction, the rotation of the fixed core 81 with respect to the yoke 86 is prevented. Accordingly, the rotation of the fixed core 81 can prevent the seal member 98 from being damaged, and can also prevent the coil conductor passing through the fixed core 81 from being damaged.

FIG. 5 shows a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals.

In the electromagnetic drive unit 18, the yoke 3
6 is connected to the flange portion 81b of the fixed core 81 by a caulking connection structure similar to that of the first embodiment, and the switch case 44 ₂
The surface facing the fixed core 81 is provided with an annular groove 99. The annular groove 99 has an O-ring 1 serving as a sealing member that is in contact with the annular caulked portion 86c over the entire circumference.
00 is mounted, and the inner diameter of the O-ring 100 in a natural state is set slightly smaller than the inner diameter of the annular groove 99.

According to the second embodiment, the inner diameter of the O-ring 100 in a natural state is slightly smaller than the inner diameter of the annular groove 99, so that when the electromagnetic drive unit 18 and the switch case 44 are assembled, the annular groove is not required. O-ring to 99
The O-ring 100 can be fixedly held in the switch case by elastically fitting the O with the O. Thus, the assembling workability can be improved.

Further, the O-ring 100 comes into contact with the substantially flat annular caulking portion 86c. In addition, the O-ring 100 has a relatively small volume reduction allowance and can obtain a large sealing surface pressure. Therefore, it is possible to prevent a large stress from being applied to the O-ring 100 and improve the heat aging resistance of the O-ring 100.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0050]

As described above, according to the first aspect of the present invention, the seal is formed on the fixed core of the electromagnetic drive unit by positioning the outer periphery of the seal main portion with the inner periphery of the annular caulking portion. The member can be fixedly held on the fixed core, and assembling workability can be improved. Further, since the seal member is sandwiched over a relatively large area between the switch case, the fixed core and the annular caulking portion, local stress is prevented from being applied to the seal member, and the heat aging of the seal member is prevented. Performance can be improved.

According to the second aspect of the present invention, the fixed core sandwiched between the stepped portion and the annular caulking portion is prevented from rotating with respect to the yoke, and the sealing member is rotated by the fixed core. Damage and damage to the coil conductor can be prevented.

According to the third aspect of the present invention, when the electromagnetic drive unit and the start switch are assembled, the O-ring is resiliently fitted into the annular groove so that the O-ring is fixedly held in the switch case. Is possible, and assembling workability can be improved. Further, it is possible to prevent a large stress from being applied to the O-ring and to improve the heat aging resistance of the O-ring.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an engine starting device according to a first embodiment.

FIG. 2 is an enlarged longitudinal sectional view of an electromagnetic drive unit and a start switch.

FIG. 3 is an enlarged view of a part viewed from an arrow 3 in FIG. 2;

FIG. 4 is a cross-sectional view showing a state where the yoke and the fixed core are engaged with the concave and convex.

FIG. 5 is a sectional view corresponding to FIG. 3 of a second embodiment.

FIG. 6 is a sectional view corresponding to FIG. 3 of a conventional example.

[Explanation of symbols]

4 Starting motor 16 Pinion 17 Starting ring gear 18 Electromagnetic drive unit 19 Starting switch 39 Moving core 44 ₁ , 44 ₂ Switch case 81・ Fixed core 81a ・ ・ ・ Base 81b ・ ・ ・ Flange 82 ・ ・ ・ Bobbins 83, 84 ・ ・ ・ Coil 85 ・ ・ ・ Coil assembly 86 ・ ・ ・ Yoke 86a ・ ・ ・ Step 86b ・ ・ ・ Thin cylinder Part 86c: annular caulking part 98: sealing member 98a: sealing main part 98b: annular protruding part 99: annular groove 100: O-ring as a sealing member

Claims (3)

[Claims] 1. Fixed core (81), said fixed core (81)
The movable core (39), which is arranged to face the fixed core (81) so as to be able to approach and separate from the fixed core (81), a part of the fixed core (81), and a bobbin (82) surrounding the movable core (39) are provided with coils (83, 84). ) Is wound, and one end is swaged and connected to the outer peripheral edge of the fixed core (81) to cover the coil assembly (85) and the other end is the movable core (39). An electromagnetic drive unit (18) that is capable of exerting an electromagnetic force for driving the pinion (16) in a direction in which the pinion (16) meshes with the starting ring gear (17); and the fixed core ( 81) and a switch case (44) fastened to the fixed core (81) with a sealing member (98) interposed therebetween.
₁ ) The fixed core (81) of the movable core (39)
A start switch (19) for starting a start motor (4) for conducting power to the pinion (16) by conducting in response to an approach operation to the pinion (16);
The fixed core (81) includes a base (81a) surrounded by one end of the coil assembly (85), and a coil assembly (85).
And a ring-shaped flange portion (81b) extending radially outward from the base portion (81a) and having a constant thickness, facing the one end of the base member, and the flange portion is provided on the yoke (86). An annular step (8) for receiving the inner surface of the outer peripheral edge of (81a)
6a) and a thin cylindrical portion (86) surrounding the flange portion (81b) by connecting the base end portion to the outer peripheral edge of the step portion (86a).
b) and the outer peripheral edge of the flange portion (81b) is connected to the step portion (8).
6a) and crimped to the end of the thin cylindrical portion (86b) so as to be continuous in a substantially L-shaped cross-section to the outer periphery of the flange (81b) over the entire circumference. annular crimped portion to be engaged (86c) and is provided, said sealing member (98) includes an annular crimped portion (86c) is restricted periphery with the inner periphery of the switch case (44 ₁₎ and the fixed core (81) Disc-shaped seal main part (9
Engine to 8a), characterized in that consists of a seal main portion (98a) switch case (44 ₁ Te projecting radially outwardly) and cyclic crimped portion (86c) annular overhang sandwiched between the (98b) Starting device. 2. The thin cylindrical portion (86b) is unevenly engaged with an outer peripheral surface of a flange (81b) of a fixed core (81) at at least one position along a circumferential direction of the thin cylindrical portion (86b). The engine starting device according to claim 1, wherein: 3. Fixed core (81), said fixed core (81)
The movable core (39), which is arranged to face the fixed core (81) so as to be able to approach and separate from the fixed core (81), a part of the fixed core (81), and the bobbin (82) surrounding the movable core (39), the coils (83, 84) ) Is wound, and one end is swaged and connected to the outer peripheral edge of the fixed core (81) to cover the coil assembly (85) and the other end is the movable core (39). An electromagnetic drive unit (18) that is capable of exerting an electromagnetic force for driving the pinion (16) in a direction in which the pinion (16) meshes with the starting ring gear (17); and the fixed core ( 81) and a switch case (4) fastened to the fixed core (81) with a sealing member (100) interposed therebetween.
4 ₂ ), and the fixed core (8) of the movable core (39) is provided.
The pinion (1) conducts in response to the proximity operation to the pinion (1).
A starting switch (19) for starting a starting motor (4) for transmitting power to the stationary core (81), wherein the fixed core (81) is a coil assembly (85).
A base (81a) surrounded by one end of the base plate, and a ring-shaped flange having a constant thickness and extending radially outward from the base (81a) so as to face one end of the coil assembly (85). (81b), the yoke (86) has an annular step (86a) for receiving the inner surface of the outer periphery of the flange (81b), and a base end on the outer periphery of the step (86a). A thin cylindrical portion (86b) surrounding the flange portion (81b) by connecting the portions, and the thin cylindrical portion for sandwiching an outer peripheral edge of the flange portion (81b) between the step portion (86a). Department (8
An annular caulked portion (86c) which is caulked so as to be continuous in a substantially L-shaped cross section at the tip end of 6b) and is engaged over the entire outer periphery of the outer periphery of the flange portion (81b) is provided. the annular crimped portion annular groove allowed to mounting the O-ring is sealing member (100) which contacts the entire periphery in (86c) (99) is, the switch case (44 ₂₎
An engine starting device provided on a surface facing a fixed core (81).