JPH10285856A - Electric starter motor and painting therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a rear bracket on a yoke without using a through bolt, by making the several points at the side surface in the vicinity of the rear end part of the yoke being struck out from its outside to its inside, forming a flat surface at a part where the yoke is brought into contact with a discoidal rear bracket, and caulking the rearward end surface of the flat surface so as to fix the rear bracket. SOLUTION: A rear end part of a yoke 2 is formed by extending it to a position where it is brought into contact, with a discoidal rear bracket 5, the several points of the side surface in the vicinity of the rear end surface part of the yoke 2 are struck out from its outside to its inside, and a flat surface 2a is formed at a part where the yoke 2 is brought into contact with the bracket 5. Under such a condition as the rear bracket 5 is fitted in the yoke 2 to be brought into contact with the flat surface 2a, the rearward end surface 2b of the flat surface 2a is caulked to fix the rear bracket 5. A short bolt 6 is used for fixing the yoke 2 and a front bracket 1. It is thus possible to fix the rear bracket 5 to the yoke 2 without need for using a long through bolt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling structure of a yoke and a rear bracket of a starting motor used for starting an engine of a vehicle, and a method of painting the same.

[0002]

FIG. 3 is a sectional side view showing an example of a conventional starting motor, and FIG. 4 is a sectional view taken along line AA of FIG.
This starting motor is mounted on the engine via a front bracket 21. A field device including a field winding 23 and a field iron core 24 is fixed to an inner peripheral surface of a yoke 22 connected to a rear portion of the front bracket 21. Yoke 22
Are supported by being sandwiched in the axial direction by a front bracket 21 and a rear bracket 25. The yoke 22 and the rear bracket 25 are respectively provided with a yoke spigot portion 22a,
It is fitted by the rear bracket spigot part 25a. The through bolt 26 is inserted axially inside the yoke 22 along the yoke 22, and both ends thereof are attached to the front bracket 21 and the rear bracket 25, and the front bracket 21, the rear bracket 25 and the yoke 22 are integrally fixed. I have.

The yoke 22 is usually painted as a single item,
The rear bracket 25 is not painted when the material is aluminum, but is plated when the material is an iron plate. The electromagnetic switch 27 is attached to the front bracket 21 and has a hook 2 inserted and supported by a plunger 28 forming a movable iron core.
9 has a front end protruding. The upper end of the shift lever 30 is engaged with the hook 29, and the lower end of the shift lever is engaged with the overrunning clutch 31. The shift lever 30 is supported by the front bracket 21 at an intermediate projecting portion 30a. It is turned.

Next, the operation will be described. When the start switch is turned on, the exciting coil (not shown) of the electromagnetic switch 27 is excited, the plunger 28 is attracted and retracted inward, and the shift lever 30 is rotated counterclockwise in FIG. The running clutch 31 is moved forward. When the engine is started and the start switch is turned off, when the plunger 28 of the electromagnetic switch 27 returns to the forward position, the shift lever 30 pivotally returns in the clockwise direction in FIG.

FIG. 5 is a side view showing another example of a conventional starting motor, and FIG. 6 is a front view of the same starting from the rear bracket side. 3, the through bolt 32 is inserted in the axial direction along the yoke 33 and both ends thereof are attached to the front bracket 34 and the rear bracket 35, as in the case of FIG. The yoke 33 is fixed integrally. In this case, the through bolt 26 is attached to the yoke 3
3 is arranged outside.

[0006]

The conventional starter motor is constructed as described above. However, in the starter motor shown in FIGS. 3 and 4, the distance between the field windings 23 is large. Therefore, a space is required for the bolt 26 to pass through, and the number of windings of the field winding 23 cannot be increased in order to increase the output torque of the starting motor. Further, if the gap between the field winding 23 and the through bolt 26 is small, there is a risk that the field winding 23 and the through bolt 26 are rubbed by vibration or the like, the insulating film of the field winding 23 is broken, and a short circuit occurs. . In addition, there is a problem that the through bolt 26 is long and is broken by vibration because of a long length. Further, it is necessary to provide a yoke spigot portion 22a and a rear bracket spigot portion 25a for fitting the yoke 22 and the rear bracket 25, and it is necessary to perform machining with a lathe or the like. In the starter motors of FIGS. 5 and 6, the through bolt 32 is located outside the yoke 33, and thus may interfere with the engine and the accessories of the engine.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a starting motor for fixing a rear bracket to a yoke without using through bolts.

[0008]

According to a first aspect of the present invention, there is provided a starting motor, wherein several sides near the rear end of the yoke are punched inward from the outside, so that the yoke comes into contact with a disk-shaped rear bracket. A flat surface is provided in a contact portion, and a rear end surface of the flat surface is caulked to fix a disk-shaped rear bracket.

A starting motor according to a second aspect of the present invention includes:
The yoke and the front bracket are directly connected with short bolts.

According to a third aspect of the present invention, there is provided a method for coating a starting motor, wherein a rear bracket is fixed to a yoke by caulking, and then the yoke and the rear bracket are painted in the assembled state.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side cross-sectional view showing a starting motor according to the present invention, and FIG. 2 is a front view similarly viewed from a rear bracket side. This starting motor is mounted on the engine via the front bracket 1. A field device comprising a field winding 3 and a field iron core 4 is fixed to the inner peripheral surface of a cylindrical yoke 2 which is connected to the rear part of the front bracket 1 and has an opening at the rear end face in the axial direction. . The rear end of the yoke 2 is provided so as to extend to a position in contact with the rear bracket 5 formed in a disk shape. Rear bracket 5
A flat surface 2a is provided at a portion where it comes into contact with the surface. The rear bracket 5 is fixed by caulking the rear end face 2b of the flat surface 2a in a state where the rear bracket 5 is fitted to the yoke 2 and brought into contact with the flat surface 2a.

In this embodiment, as shown in FIG. 2, four flat surfaces 2a are provided, and the rear bracket 5 is fixed to the yoke 2 by caulking the corresponding yoke rear end surfaces 2b. The yoke 2 is fixed to the front bracket 1 by bolts 6. The electromagnetic switch 7 is attached to the front bracket 1, and a front end of a hook 9 inserted and supported by a plunger 8 forming a movable iron core projects. The upper end of the shift lever 10 is engaged with the hook 9, and the lower end of the fork is engaged with the overrunning clutch 11.
, And is supported by the front bracket 1 at the intermediate protruding portion 10a, and is rotated about this as a fulcrum.

Next, the operation will be described. When the start switch is turned on, the exciting coil (not shown) of the electromagnetic switch 7 is excited, the plunger 8 is attracted and retracted inward, and the shift lever 10 is rotated counterclockwise in FIG. The overrunning clutch 11 is moved forward. When the engine is started and the start switch is turned off, when the plunger 8 of the electromagnetic switch 7 returns to the forward position, the shift lever 10 pivotally returns in the clockwise direction in FIG.

With the above construction, the joint surface between the rear bracket 5 and the yoke 2 is formed by the flat surface 2a, so that it is not necessary to form a special fitting surface by machining as in the prior art. Also, according to the present invention, the rear bracket 5 can be fixed to the yoke 2 without using a through bolt as in the prior art, and there is no need to provide a space for the through bolt in the yoke 2 and the through bolt is Since it does not pass through the outside of the vehicle, there is no interference with the engine and accessories. The yoke 2 and the front bracket 1 can be fixed by using the short bolts 6 without using long through bolts, so that there is no fear of breakage due to vibration or the like. In addition, since the inner surface of the yoke 2 and the outer periphery of the rear bracket 5 are fitted to each other as in the related art, it is not necessary to provide a spigot portion for each. In the present embodiment, a field device including the field winding 3 and the field iron core 4 is used. However, a similar effect can be obtained by using a field device including a permanent magnet.

Embodiment 2 According to the second embodiment of the present invention, after the rear bracket 5 is fixed to the yoke 2 by caulking, the yoke 2 and the rear bracket 5 are painted. If the yoke 2 and the rear bracket 5 are assembled separately after painting or plating, the painting and plating are peeled off by punching and caulking, the rust tends to rust, and the appearance is not good, but according to the second embodiment of the present invention, Since painting is done later, there is no problem of plating peeling and rust,
In addition, even if there is a gap between the fitting surfaces of the yoke 2 and the rear bracket 5, the paint enters the gap by performing painting, and a sealing effect can be obtained, so that there is no problem such as flooding.

[0016]

According to the starting motor according to the first and second aspects of the present invention, several sides near the rear end of the yoke are punched inward from the outside, so that the yoke contacts the disk-shaped rear bracket. A flat surface is provided in the contacting part, and the rear end surface of this flat surface is caulked to fix the disk-shaped rear bracket, so the rear bracket can be fixed to the yoke without using a through bolt as in the past, There is no need to provide a space for the above, and the through bolt does not pass through the outside of the yoke, so that there is no interference with the engine and accessories.
Further, it is possible to use a short bolt for fixing the yoke and the front bracket, and there is no need to use a long through bolt, so that there is no fear of breakage due to vibration or the like. Further, since the inner surface of the yoke and the outer periphery of the rear bracket are fitted to each other as in the related art, it is not necessary to provide a spigot for each.

Further, according to the starting motor according to the third aspect of the present invention, the rear bracket is fixed to the yoke by caulking and then the yoke and the rear bracket are painted, so that there is no problem of peeling of the plating and rust. Even if there is a gap between the fitting surfaces of the yoke and the rear bracket, the paint enters the gap by applying the paint, and a sealing effect is obtained, so that there is no problem such as flooding.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a starting motor according to Embodiment 1 of the present invention.

FIG. 2 is a front view showing a starting motor according to Embodiment 1 of the present invention.

FIG. 3 is a side sectional view showing a conventional starting motor.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a side view showing another conventional starting motor.

FIG. 6 is a front view showing another conventional starting motor.

[Explanation of symbols]

2 Yoke, 2a plane, 2b rear end face, 3 field winding, 4 field iron core, 5 rear bracket, 6 bolts.

Claims (3)

[Claims] 1. A cylindrical yoke having an opening at an axially rear end surface and having a field device fixed to an inner peripheral surface thereof, and a front bracket and a rear bracket respectively attached to front and rear portions of the yoke in the axial direction. In the starting motor provided with: a portion in which the rear bracket is formed in a disk shape, and several portions of the side surface near the rear end of the yoke are punched inward from the outside, so that the yoke contacts the disk-shaped rear bracket. A starting motor, wherein a flat surface is provided, and a peripheral portion of the disk-shaped rear bracket is brought into contact with the flat surface portion, and the rear end surface of the flat surface is caulked to fix the disk-shaped rear bracket. 2. The starting motor according to claim 1, wherein the yoke and the front bracket are directly connected by bolts. 3. The starting motor according to claim 1, wherein the yoke and the rear bracket are painted after the rear bracket is assembled and fixed to the yoke by caulking.