JP2003184711A - Starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure good sealing performance by reducing a gap in a fitting part of a yoke and an end frame 10 as much as possible by fastening a through bolt. <P>SOLUTION: An end frame 10 of a starter is provided with bolt receiving parts 10a each having a bolt head part 11a of the through bolt contact thereon and receiving fastening force at two opposing positions in a radial direction. A rib shaped projection part 19 is provided as one body near the bolt receiving part 10a on a rear end surface of the end frame 10. The projection part 19 is provided annularly along a circumference of the end frame 10. Since the projection part 19 is provided as one body near the bolt receiving part 10a, the rigidity of the bolt receiving part 10a is increased and the deformation amount of the end frame 10 due to the fastening of the through bolt can be reduced to reduce the gap in the fitting part of the yoke and the end frame 10 as much as possible. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a starter for starting an engine.

[0002]

2. Description of the Related Art Conventionally, there has been a starter in which a yoke of a starting motor is sandwiched between a starter housing and an end frame, and the starter housing and the end frame are fastened with two through bolts. The through bolt is inserted into a through hole of a bolt receiving portion provided in the end frame, passes through the outside of the yoke, and its own screw portion is screwed into a screw hole provided in the starter housing to connect the starter housing and the end frame. The space is tightened. The bolt receiving portion is provided so as to project radially outward from the outer peripheral surface of the end frame.

[0003]

However, in the above starter, when the tightening force of the through bolt is increased,
The bending moment applied to the end frame with the contact portion with the yoke as a fulcrum becomes large, and the end frame is deformed by the influence of the bending moment to cause "warpage". For example, as shown in FIG. 6, in the end frame 100, since a large bending moment is applied to the bolt receiving portion 120 that receives the tightening force of the through bolt 110, the deformation amount (warpage) is increased as the distance from the bolt receiving portion 120 increases in the circumferential direction. It may become large, and a gap x (see FIG. 7) may be formed between the end surface 131 of the yoke 130 and the end surface 101 of the end frame 100.

If the gap becomes large, when the starter is flooded from the outside, water may enter the inside of the starter from the gap, causing rust on the motor parts and the like, which may lead to deterioration of the function of the motor. On the other hand, conventionally, after tightening the through bolt, coating is performed by immersion, spraying, or the like. Plate and paint the end frame separately.
Waterproofness is ensured by arranging an O-ring at the butting portion between the yoke and the end frame or the seal fitting portion.

However, in the above waterproofing measures (1) to (3), painting, plating, addition of O-rings, etc. all increase the man-hours required for work, resulting in cost increase. The present invention was made based on the above circumstances, and its purpose is to:
An object of the present invention is to provide a starter capable of ensuring a sealing property by reducing a gap generated at a fitting portion between a yoke and an end frame by tightening a through bolt as much as possible.

[0006]

[Means for Solving the Problems] (Means for Claim 1) In the end frame, a plurality of bolt receiving portions are provided in the circumferential direction in contact with the bolt heads of the through bolts to receive a tightening force, and the bolt receiving portions are provided. A rib-shaped protrusion extending from the end surface of the end frame to the side opposite the yoke in the axial direction is provided at least in the vicinity of.

According to this structure, since the rigidity of the bolt receiving portion is increased by the protrusion, the amount of deformation of the end frame caused by tightening the through bolt can be reduced. As a result, the gap generated at the fitting portion between the yoke and the end frame can be made as small as possible, so that the entry of foreign matter (particularly moisture) into the starter can be suppressed. In addition, since the protrusion is provided on the end frame, the protrusion can be used as a radiating fin, so that the heat generated by the commutator generated when the starter operates can be effectively released to the outside, and the brush life can be improved. Become.

(Means for Claim 2) In the starter according to claim 1, the projection is provided in an annular shape along the periphery of the end frame, and the projection is provided with a groove for holding the battery cable. Has been. In this case, since it is not necessary to fix the battery cable by the clamp member provided on the vehicle side as in the conventional case, the number of parts can be reduced by eliminating the clamp member.
Further, since the battery cable is held in the groove and comes into contact with the projection, heat can be dissipated from the battery cable to the projection when power is supplied to the starter, so that heat generation of the battery cable itself can be suppressed.

(Means of Claim 3) In the starter described in Claim 2, the groove is provided at a plurality of locations. In this case, the groove for holding the battery cable can be selected, so that the degree of freedom in handling the battery cable is improved.

(Means of claim 4) In the starter according to any one of claims 1 to 3, the through bolts are disposed so as to pass through the outside of the yoke in the radial direction and to be opposed to each other in the radial direction of the yoke. Two are used, one for each. If the number of through bolts is increased, the interval between the through bolts adjacent to each other in the circumferential direction is correspondingly reduced, so that the deformation (warpage) of the end frame is also reduced. On the other hand, a normal starter often uses a minimum number of through bolts, that is, two through bolts, for cost reduction. In this case, since the deformation of the end frame becomes large, by adopting the configuration of the present invention, it is possible to provide a starter excellent in waterproofness.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is a rear plan view of the starter 1, and FIG. 2 is a side plan view of the starter 1. Starter 1 of this embodiment
As shown in FIG. 2, is a starting motor 2 that generates a rotational force.
And an electromagnetic switch 3 for controlling ON / OFF of the energizing current of the starting motor 2, an output shaft (not shown) rotated by being driven by the starting motor 2, and a ring gear (not shown) of the engine so as to mesh with the starting motor 2. It is composed of a pinion gear 4 and the like for transmitting the rotational force to the ring gear.

The starting motor 2 is provided with an armature 6 on the inner circumference of the yoke 5, a brush 8 is arranged on a commutator 7 provided at the end of the armature 6, and the armature 6 is energized via the brush 8. It is a well-known DC motor. As shown in FIG. 2, the starting motor 2 has a yoke 5 sandwiched between a starter housing 9 and an end frame 10 and is fixed by two through bolts 11.

The electromagnetic switch 3 has a function of attracting a built-in plunger (not shown) by magnetic force to close a motor contact (not shown), and utilizing the plunger attracting force, pushes the pinion gear 4 forward of the shaft.
As shown in FIG. 2, this electromagnetic switch 3 has a starter motor 2
Are arranged side by side on the outside in the radial direction and are fixed to the starter housing 9 by bolts 12.

The above-mentioned motor contacts are a set of fixed contacts provided in the energizing circuit of the starting motor 2, and are integrally provided with the battery terminal 14 and the motor terminal 15 fixed to the switch cover 13 of the electromagnetic switch 3, respectively. Has been.
The motor terminal 15 is connected to the field coil 17 (see FIG. 2) of the starting motor 2 via the lead wire 16, and the battery terminal 14 is connected to the battery cable 18 (see FIG. 3).
Connection) to the in-vehicle battery.

The output shaft is, for example, a speed reducer (not shown).
Is arranged coaxially with the rotating shaft 6a of the starting motor 2 via
The rotation of the armature 6 is decelerated by the speed reducer and transmitted. The pinion gear 4 is provided movably on the output shaft together with a known one-way clutch (not shown) that is helically spline fitted to the output shaft, and the rotation of the output shaft is transmitted via the one-way clutch.

Here, the end frame 1 according to the present invention
0 will be described. The end frame 10 is a cast molded product made of, for example, an aluminum material, and is combined with the rear opening of the yoke 5 (opening on the side opposite to the pinion gear) by seal fitting, and the commutator 7, the brush 8 and the like are arranged on the starter. The rear side (anti-pinion gear side) of the motor 2 is covered. The end frame 10 is provided with two bolt receiving portions 10a that come into contact with the bolt head portions 11a of the through bolts 11 and receive a tightening force, at two positions facing each other in the radial direction. As shown in FIG. 1, the bolt receiving portion 10a is provided so as to project outward in the radial direction from the outer peripheral surface of the end frame 10, and a round hole (not shown) for passing the through bolt 11 penetrates in the axial direction. There is.

The through bolt 11 is inserted from the rear side of the end frame 10 into the round hole of the bolt receiving portion 10a, passes through the outside of the yoke 5, and has its own screw portion 11b formed in the starter housing 9. The starter housing 9 and the end frame 10 are screwed into holes (not shown).
The yoke 5 is sandwiched between and and tightened.

On the end surface of the end frame 10, a rib-shaped protrusion 19 is integrally provided at least near the bolt receiving portion 10a. The protruding portion 19 extends from the end surface of the end frame 10 to the side opposite to the yoke in the axial direction (to the right in FIG. 2), and is provided on the electromagnetic switch 3 with the battery terminal 14
Also, it projects in the axial direction from the motor terminal 15 (see FIG. 2). As shown in FIG. 1, for example, the protrusions 19 are annularly provided along the circumference of the end frame 10, and are provided with grooves 19a at radially opposed positions. As shown in FIG. 3, the groove portion 19a is provided with the battery cable 1 connected to the battery terminal 14 of the electromagnetic switch 3.
8 can be held.

Next, the operation and effect of this embodiment will be described. The operation of the starter 1 is extremely general and will not be described. In the end frame 10 of this embodiment, the protrusion 19 is integrally provided in the vicinity of the bolt receiving portion 10a that receives the tightening force of the through bolt 11, so that the protrusion 19 increases the rigidity of the bolt receiving portion 10a, and the through frame End frame 10 generated by tightening bolts 11
The deformation amount of can be reduced. As a result, the gap generated at the fitting portion (see FIG. 2) between the yoke 5 and the end frame 10 can be made as small as possible. Foreign matter (especially moisture) from the fitting part with the frame 10 to the inside of the motor
It is possible to provide a starter 1 that can prevent the invasion of water and has excellent environment resistance.

Further, since the projection 19 of the end frame 10 is provided so as to project in the axial direction from the battery terminal 14 and the motor terminal 15, for example, an external impact is applied from the rear side of the starter 1 (right side in FIG. 2). In this case, it is possible to prevent the shock from being directly applied to the battery terminal 14 and the motor terminal 15 by receiving the shock on the protrusion 19.
The battery terminal 14 and the motor terminal 15 can be protected from an external impact, and the battery terminal 14 can be prevented from being inadvertently short-circuited.

Further, since the rib 19 is provided on the end frame 10, the projection 19 can be used as a heat radiation fin. That is, since the heat generated by the commutator 7 generated when the starter 1 is operated can be effectively radiated to the atmosphere from the protrusion 19, the temperature rise of the brush 8 can be suppressed and the life of the brush can be improved.

Further, the battery cable 18 is attached to the protrusion 19.
Since the groove portion 19a capable of holding the battery cable 18 is provided, it is not necessary to hold the battery cable 18 with a clamp or the like fixed to the vehicle side as in the conventional case, and the number of parts can be reduced. Further, since the battery cable 18 is held in the groove portion 19a and comes into contact with the projecting portion 19, heat can be dissipated from the battery cable 18 to the projecting portion 19 when power is supplied to the starter 1, so that heat generation of the battery cable 18 itself can be suppressed. can get.

(Second Embodiment) FIG. 4 is a rear plan view of the starter 1. The present embodiment is an example of the case where the protrusions 19 of the end frame 10 are provided with the groove portions 19a at three or more places (four places in the figure). In this case, for example, when the battery cable 18 is handled differently depending on the positional relationship between the battery mounted on the vehicle and the starter 1, the groove portion 19a for holding the battery cable 18 can be appropriately selected. The degree of freedom in handling is improved.

(Third Embodiment) FIG. 5 is a rear plan view of the starter 1. In this embodiment, the protrusion 19 is used as the bolt receiving portion 10.
This is an example of a case where it is provided only in the vicinity of a. In the first and second embodiments described above, the protrusion 19 is provided in an annular shape along the periphery of the end frame 10, but the bolt receiving portion 1
For the purpose of increasing the rigidity of 0a, as shown in FIG. 5, the protrusion 19 may be provided only in the vicinity of the bolt receiving portion 10a.

[Brief description of drawings]

FIG. 1 is a rear plan view of a starter (first embodiment).

FIG. 2 is a side plan view of the starter (first embodiment).

FIG. 3 is a rear plan view of the starter (first embodiment).

FIG. 4 is a rear plan view of the starter (second embodiment).

FIG. 5 is a rear plan view of the starter (third embodiment).

FIG. 6 is a rear plan view of the starter (prior art).

FIG. 7 is a side view showing a fitting portion between a yoke and an end frame (prior art).

[Explanation of symbols]

1 starter 2 Starting motor 5 York 6 Armature 7 commutator 8 brushes 10 end frame 10a bolt receiving part 11 Through bolt 11a bolt head 18 battery cable 19 Projection 19a groove

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5H605 BB05 CC01 CC02 CC10 DD03                       EA06 EC02 EC04 EC08 GG06                 5H607 AA05 AA06 BB01 BB04 CC01                       CC09 DD01 DD09 FF02 JJ05                       JJ07

Claims (4)

[Claims] 1. An armature is provided on an inner circumference of a yoke, and a brush is slidably contacted with a commutator provided on the armature, and a starter motor is supplied to the armature via the brush, and the armature is fitted in an opening of the yoke. A starter comprising a commutator and an end frame that covers the outer circumference of the brush, wherein the yoke and the end frame are fastened and fixed by a plurality of through bolts, wherein the end frame is a bolt head of the through bolt. A plurality of bolt receiving portions that are in contact with the portion and receive a tightening force in the circumferential direction, and are rib-shaped extending from the end surface of the end frame to the side opposite the yoke in the axial direction at least in the vicinity of the bolt receiving portions. A starter characterized in that a protrusion is provided. 2. The starter according to claim 1, wherein the protrusion is provided in an annular shape along the periphery of the end frame, and the protrusion is provided with a groove for holding a battery cable. A starter characterized by that. 3. The starter according to claim 2, wherein the groove portion is provided at a plurality of locations. 4. The starter according to any one of claims 1 to 3, wherein the through bolts are disposed so as to pass through a radially outer side of the yoke and are located at positions facing each other in a radial direction of the yoke. A starter characterized in that a total of two are used, one for each.