JPH1130175A - Starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity of a magnetic switch holding part by forming a side wall part of a magnetic switch holding part of a front bracket in thinned shape from the pinion side, and making the width of the side wall part of the magnetic switch holding part wider on the motor side than on the magnetic switch side. SOLUTION: A motor 1 and a magnetic switch 3 of a starter are mounted to a front bracket 4 by a bolt 10, and a centering location part 4c of the front bracket 4 is fitted to a starter fitting part 9 of an internal combustion engine. In this case, the width of a side wall part of a magnetic switch holding part of the front bracket 4 is formed to be wider on the motor 1 side than the magnetic switch 3 side, and the distance between the side wall part of a magnetic switch fitting face and the side wall part on the pinion side of a magnetic switch holding part is so formed that the motor 1 side distance is longer than the distance on the tip side of the magnetic switch fitting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter for starting an internal combustion engine, and more particularly to a starter for mounting the starter on the internal combustion engine and increasing the rigidity of a front bracket for holding parts of the starter. About the starter.

[0002]

2. Description of the Related Art In a starter for starting an internal combustion engine, a flange portion is generally provided on a front bracket, and the starter is mounted on the internal combustion engine via the flange portion. The front bracket has a function of holding a motor section and a magnetic switch section of the starter.

The front bracket receives a strong stress due to the vibration of the internal combustion engine and a stress due to the unevenness of the road while the vehicle is running. If the rigidity of the front bracket is insufficient, the motor unit and the magnetic switch unit may resonate. This causes the starter parts to malfunction.

[0004] In view of the above, the front bracket must have considerable rigidity to hold the motor unit and the magnetic switch unit.

In the conventional device, in order to secure the rigidity of the magnetic switch holding portion of the front bracket, the thickness of the front bracket is increased to increase the rigidity.

As described in JP-B-63-1459,
There is a structure in which a rib is provided on the pinion side of the magnetic switch holding portion in order to secure the rigidity of the magnetic switch holding portion of the front bracket.

[0007]

In the above prior art, the thickness of the front bracket is increased to secure the rigidity of the magnetic switch holding portion of the front bracket. However, this structure increases the weight and cost of the front bracket. Is a factor.

Further, in the structure in which a rib is provided on the front bracket described in Japanese Patent Publication No. 63-1459, when the vibration direction of the magnetic switch is parallel to the rib, there is an effect of improving the rigidity to some extent. However, when the vibration direction of the magnetic switch is perpendicular to the rib, there is a problem that the rigidity hardly improves. Further, when there is no space between the starter mounting surface of the engine and the magnetic switch holding portion of the front bracket, there is a problem that the rib cannot be provided.

The present invention has been made in view of these points, and an object of the present invention is to secure the rigidity of the magnetic switch holding portion of the front bracket while minimizing the increase in weight and cost. Another object of the present invention is to provide a lightweight, inexpensive and highly reliable starter.

Another object of the present invention is to provide a lighter and less expensive starter when the same rigidity as that of a conventional front bracket can be ensured.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is to make the side wall of the magnetic switch holding part of the front bracket stolen from the pinion side so that the width of the side wall part of the magnetic switch holding part is larger than that of the magnetic switch side. In addition to the shape that the motor side is wider, the distance between the side wall of the magnetic switch mounting side of the front bracket and the side wall of the magnetic switch holding part pinion side is closer to the motor side than the distance on the tip side of the magnetic switch mounting part. Is achieved by making the shape longer.

According to this structure, the rigidity of the magnetic switch holding portion can be significantly improved while suppressing an increase in the weight of the front bracket.

In addition, when the thickness of the conventional front bracket is increased or ribs are added to secure the rigidity of the magnetic switch holding portion, the rigidity can be substantially reduced. And material cost can be reduced.

[0014]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG.

In FIG. 1, a starter motor 1 and a magnetic switch 3 are mounted on a front bracket 4 by bolts 10. Reference numeral 9 denotes a starter mounting portion of the internal combustion engine, which is fitted to the spigot portion 4c of the front bracket 4 and the bolt 1 is attached to the flange portion 4d of the front bracket 4.
By screwing 0, the starter is mounted on the internal combustion engine.

FIG. 2 shows the shape of the front bracket viewed from the motor side in the axial direction of the output shaft 2, FIG. 3 shows the shape of the front bracket viewed from the pinion side of the output shaft 2 in the axial direction, and FIG. FIG. 5 shows a cross-sectional shape of the magnetic switch holding portion of the front bracket.

As shown in FIG. 2, the width L1 of the side of the side wall 4e of the magnetic switch holding portion is wider at the motor side than at the width L2 of the magnetic switch side.

As shown in FIG. 4, the distance between the side wall portion 4f on the magnetic switch mounting side and the side wall portion 4g on the magnetic switch holding portion pinion side is longer than the distance L4 on the distal end side of the magnetic switch mounting portion on the motor side.
3 is larger. Further, as shown in FIG. 5, the side wall portion of the magnetic switch holding portion has a shape stolen from the pinion side.

With such a structure, the rigidity of the magnetic switch can be greatly improved in a well-balanced manner in both the X and Y directions shown in FIG. 3 while suppressing an increase in the mass of the front bracket.

In the embodiment of the present invention, a starter in which a bearing portion is provided at a nose portion of a front bracket, which is generally called an open type, has been described. However, a pinion is an overhang type, and a bearing portion is provided at a tip end side of the pinion. Needless to say, the same effect can be obtained even with a dustproof starter having no structure.

[0021]

According to the present invention, an increase in the weight of the front bracket can be suppressed, an increase in the weight of the front bracket and an increase in the cost can be suppressed, and the rigidity of the magnetic switch holding portion can be greatly improved. An inexpensive and highly reliable starter can be provided.

If it is sufficient to secure the same rigidity as the conventional front bracket, it is possible to greatly reduce the weight and material costs.

[Brief description of the drawings]

FIG. 1 is an overall view of a starter.

FIG. 2 is a front bracket shape diagram of the present invention.

FIG. 3 is a front bracket shape diagram of the present invention.

FIG. 4 is a sectional view of a front bracket according to the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Output shaft, 3 ... Magnetic switch, 3a ... Plunger, 4 ... Front bracket, 4
a: Nose part, 4b, 5a: Bearing part, 4c: Inlay part, 4d: Flange part, 4e: Side wall part of magnetic switch holding part, 4f ... Side wall part of magnetic switch mounting side, 4g: Magnetic switch holding part pinion side 5: Rear bracket, 6: Roller clutch, 7: Pinion, 8: Shift lever, 9: Starter mounting part, 10: Bolt, 11: Ring gear.

Claims (2)

[Claims] 1. An electric motor for generating a rotational force for starting an internal combustion engine, a one-way roller clutch integrally formed with a pinion slidably supported by the output rotary shaft, and a pinion and a roller clutch. A magnetic switch that slides on the output rotary shaft and opens and closes a current supplied to the electric motor; and a front bracket for holding the electric motor and the magnetic switch, and for attaching a starter to the internal combustion engine. In the starter in which the side wall portion of the switch holding portion is robbed from the pinion side, the width of the side wall of the magnetic switch holding portion of the front bracket is wider on the electric motor side than on the magnetic switch side. A starter characterized by: 2. The starter according to claim 1, wherein the distance between the magnetic switch mounting surface of the front bracket and the pinion side wall of the magnetic switch holding portion is longer on the motor side. .