JPS61291770A - Starter - Google Patents

Abstract

PURPOSE:To improve ventilation in a magnet switch by arranging a ventilation bush communicatable between the inside and the outside of a switch yoke in a gap between the switch yoke and a motor yoke. CONSTITUTION:Stator motor 2 is arranged in parallel with a magnet switch 1 through a gap (c). Stator housing 3 will cover the magnet switch 1 and the stator motor 2. The ventilation bush 4 will communicate between the inside and the outside of switch yoke 1b while arranged in a gap (c) between the motor yoke 2a and the switch yoke 1b to be secured between the motor yoke 2a, switch yoke 1b and the starter housing 3. Consequently, ventilation in the magnet switch can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a ventilation structure for a magnet switch in a starter.

(Prior art) Conventionally, in a sealed magnet switch for a starter,
As the temperature of the switch coil increases, the air inside the switch expands, causing the plunger boot and other seals to come off. Therefore, as shown in Japanese Unexamined Patent Publication No. 59-228331, two plunger boots are provided between the magnet switch yoke and the starter housing, and ventilation holes are provided in the respective plunger boots at different positions. Then, the air expanded inside the magnetic switch was allowed to escape into the starter housing through the maze of holes in the two plunger boots.

(Problems to be Solved by the Invention) However, in the conventional device described above, by ventilating the inside of the starter housing, the ammonia-based corrosive gas generated by the sliding of the engine clutch plates that fills the starter housing is There was a problem in that the plunger penetrated into the switch through the vent hole in the plunger boot and corroded the contacts, resulting in poor continuity.

In addition, if the magnetic switch only has a hole drilled in it, water may leak into the magnetic switch from the outside through this hole.
There was a problem that the plunger and contacts would freeze, causing the starter to malfunction.

In view of the above-mentioned problems, the present invention is designed to provide good ventilation inside a magnetic switch.

(Means for solving the problem) A starter motor having a motor yoke, a magnet switch arranged in parallel with the motor yoke through a gap and having a switch yoke, the motor yoke and the switch yoke a starter housing that communicates between the inside and outside of the switch yoke, is arranged in a gap between the motor yoke and the switch yoke, and is fixed between the motor yoke, the switch yoke, and the starter housing. The starter is equipped with a ventilation pusher and.

(Function) The ventilation bush that communicates between the inside and outside of the switch yoke of the magnetic switch is placed in the gap between the motor yoke and the switch yoke, and is fixed between the motor yoke, switch yoke, and starter housing, so that the outside There is little water splashing from the air to the ventilation bushing, and it is securely fixed.

(Example) The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, 1 is a magnet switch, 2 is a starter motor arranged in parallel with the magnet switch 1 through a gap C, and 3 is a starter housing that covers the magnet switch 1 and the starter motor 2.

The magnetic switch l is a switch yoke 1b.
An excitation coil 1e is arranged on the inner periphery of the coil. Further, a cylindrical sleeve IC is provided inside the excitation coil 1e,
A plunge member 1a is disposed on the inner periphery of the sleeve IC so as to be movable in the axial direction. Further, as shown in FIG. 3, a rectangular recess 1d is formed on the starter housing 3 side of the switch yoke 1b and on the starter motor 2 side.

Reference numeral 4 denotes a ventilation bushing made of resin, which is disposed within the gap C between the switch yoke 1b and the motor yoke 2a, as shown in FIG. It is composed of a quadrangular columnar cylinder portion 4C that protrudes in a right angle direction from the ends of a pair of side walls 4a via a step portion 4b. Further, a V-shaped notch 4d is formed at the end of the cylindrical portion 4C on the side of the starter housing 3 to allow water to escape if it enters into the interior D shown in FIG. Further, two protrusions 4e are formed on the pair of side walls 4a, facing each other with a slight gap between them on the side walls 4a,
These protrusions 4e form a labyrinth. Further, the lower end surface 4f of the pair of side walls 4a of the ventilation bushing 4 has an arc shape along the motor yoke 2a, and the upper end surface 4g has an arc shape along the switch yoke 1b. Then, the pair of side walls 4a are disposed within the gap C between the switch choke 1b and the motor yoke 1a, and the cylindrical portion 4c is disposed within the switch yoke 1b.
The cylindrical portion 4c is lightly press-fitted into the recess 1d and positioned by the stepped portion 4b, and the cylindrical portion 4c is held and fixed between the switch yoke 1b and the starter housing 3. By assembling as described above, the upper end surfaces 4 of the pair of side walls 4a
g is covered by the switch yoke 1b, the lower end surface 4f is covered by the motor yoke 2a, and an opening 4h is formed only in the axial direction of the road and the pair of side walls 4a indicated by the R arrow shown in FIG. become.

Reference numeral 5 designates a plunger boot, the inner circumference of which is attached to the plunger 1a, and the outer circumference of which is securely fitted between a fitting groove 3a provided in the housing 3 and the switch yoke 1b. The plunger boot 5 prevents ammonia-based corrosive gas within the starter housing 3 from entering the magnet switch 1.

Reference numeral 6 denotes a lever, one end of which engages with the plunger la, and when the plunger la is attracted by the excitation coil 1d,
A pinion (not shown) engaged at the other end is engaged with the ring gear of the internal combustion engine.

Next, in the above configuration, the excitation coil 1e of the magnetic switch l is energized, and the expanded air inside the switch 1 due to the temperature rise of the excitation coil 1e is transferred from the cylindrical portion 4c of the ventilation bushing 4 to the pair of side walls 4a. It passes through the gap and is discharged to the outside from the opening 4h. Therefore, the plunger boot 5 and other sealing members do not come off due to air expansion, and the plunger boot 5 prevents corrosive gas, oil, water, etc. from entering the starter housing 3. Of course, except for the ventilation bush 4, water breakage from outside the switch is prevented by an external seal (not shown).

In addition, since the ventilation bushing 4 is placed in the gap C between the motor yoke 2a and the switch yoke 1b, even if there is splashing water from the outside, it is prevented by the motor yoke 2a and the switch yoke 1b. Very little water will enter.

Furthermore, even if water splashes onto the ventilation bush 4, as shown in FIG. The protrusion 4e prevents the magnet from entering the inside of the magnet switch l. Furthermore, even if some water passes between the pair of side walls 4a, it can be reliably prevented from entering the magnetic switch 1 due to the height of the cylindrical portion 4c.

Moreover, since the ventilation bushing 4 is fixed between the switch yoke 1b1, the motor yoke 2as, and the starter housing 3, it can be fixed reliably.

(Effects of the Invention) - As described above, in the present invention, the ventilation bush that communicates the inside and outside of the switch yoke is arranged in the gap between the switch yoke and the motor yoke, and the motor yoke,
Since it is fixed between the switch yoke and the starter housing, the ventilation bushing can be assembled securely, and
Even if water is splashed from the outside, it is prevented by the motor yoke and switch yoke, and has the excellent effect of greatly reducing the amount of water that enters the gap.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing essential parts of an embodiment of the starter of the present invention, FIG. 2 is a perspective view of the ventilation bushing in FIG. 1, and FIG. 3 is a view of the switch yoke of the magnetic switch in FIG. 1. The perspective view and FIG. 4 are sectional views showing an enlarged view of the main parts in FIG. 1. DESCRIPTION OF SYMBOLS 1... Magnet switch, 1b... Switch yoke, 2... Starter motor, 2a... Motor yoke, 3... Starter housing, 4... Ventilation bush, 4a... Pair of side walls , 4c...cylindrical part, 4e...
・Protrusion.

Claims (3)

[Claims] (1) A starter motor having a motor yoke is arranged in parallel with the motor yoke through a gap, and
a magnet switch having a switch yoke; a starter housing that covers the motor yoke and the switch yoke; and a starter housing that communicates between the inside and outside of the switch yoke and is disposed in a gap between the motor yoke and the switch yoke, and that is arranged in a gap between the motor yoke and the switch yoke to A starter comprising: a ventilation bush fixed between a yoke, the switch yoke, and the starter housing. (2) The ventilation bush is arranged between a pair of axially extending side walls that are arranged in contact with a gap between the motor yoke and the switch yoke, and the switch yoke and the starter housing. 2. The starter according to claim 1, further comprising a cylindrical portion extending perpendicularly to the side wall and protruding into the switch yoke. (3) The starter according to claim 1, wherein the pair of side walls of the ventilation bush are formed with a plurality of protrusions that protrude toward the side walls to form a labyrinth.