JP2560707B2 - Starter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a starter for an automobile.

[Conventional technology]

Conventionally, in Japanese Utility Model Publication No. 50-16402, one end of a brush holder plate is extended to prevent intrusion of water, oil, dust, steam, etc. from the engine side in a brush portion of a starter, and a commutation portion of an armature. A starter brush protector with an oil seal between
When the above-mentioned starter is installed vertically, dust and muddy water from the opening of the pinion enter the brush holder portion, causing troubles such as brush sliding failure due to rusting of the brush holder portion.

[Problems to be Solved by the Invention]

In the above-mentioned conventional starter, when the starter is installed vertically, there is a problem that dusty muddy water from the pinion opening enters the brush portion and causes problems such as brush sliding failure due to rusting of the brush holder.

[Means for solving the problem]

The present invention, in a vertical starter in which a pinion meshing with a ring gear of an internal combustion engine is arranged so as to face upward, a sliding contact portion with which a brush slides, and a pinion side of the sliding contact portion, and an armature coil is provided. While having a commutator having a plurality of segments consisting of a riser portion to be connected, an armature that drives the internal combustion engine by rotating the pinion, a fixed portion fixed to the outer periphery of the riser portion of the plurality of segments, A ring that protrudes from the fixing portion to the outer peripheral side in the radial direction and that has a shielding portion that shields the brush and the brush holder that holds the brush.

[Action]

When the starter is mounted vertically on the internal combustion engine, the shielding portion of the ring makes it difficult for water, oil, and the like entering from the pinion side to adhere to the brush, the sliding contact portion of the commutator with which the brush slides, and the brush holder. Further, since the fixed portion of the ring is fixed to the outer periphery of the riser portion of the plurality of segments to which the armature coil is connected, when each armature rotates at high speed, centrifugal force causes the segment to move from a predetermined position. It is prevented from leaving.

〔Example〕

The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a vertical cross-sectional view of a partial cut main part showing the configuration of an embodiment of a starter according to the present invention. 1 is an armature, and this armature 1 has a commutator 2. The commutator 2 has a plurality of segments 2a. The segment 2a includes a riser portion 2b to which the armature coil 1a is connected and a sliding contact portion 2c with which the brush 4 slides. The fixed portion 3a of the cap-shaped ring 3 is press-fitted and fixed to the outer periphery of the riser portion 2b of the segment 2a, and when viewed in the axial direction, the shielding portion 3b of the cap-shaped ring 3 causes the segment 2a of the commutator 2 to move. , The brush 4, and the brush holder 5 are covered. The brush holder 5 is fixed to the plate 5a, and the plate 5a is fastened and fixed to the end frame 6 by the screw bolt 7. The operation of the starter of the present invention having the above-described structure will be described. When the starter is mounted vertically on an internal combustion engine, water or oil that has entered through the opening A on the pinion side is blocked by the shielding portion 3b of the ring 3 having a cap shape. 2 and the brush 4 are prevented from adhering. The fixed portion 3a of the ring 3 has a plurality of segments 2a.
Since the segment 2a is press-fitted and fixed to the outer periphery of the riser portion 2b of the commutator 2, each segment 2a is prevented from being separated from a predetermined position by centrifugal force when the armature 1 rotates at high speed. The centrifugal force strength can be improved.

The ring 3 may be made of iron plate or resin. Then, water and oil are discharged to the outside through a drainage tube 9 provided at the bottom of the end frame 6.

Further, the water drain tube 9 is designed so that water from the lower side in the drawing does not enter the end frame 6.

〔The invention's effect〕

In a vertically mounted starter in which the pinion that meshes with the ring gear of the internal combustion engine is arranged so as to face upward, the shielding part of the ring causes water, oil, etc., that has entered from the pinion side to brush, and the sliding contact part of the commutator with which the brush slides. , And it becomes difficult to adhere to the brush holder, rusting of the brush holder can be suppressed, and brush sliding failure can be prevented, and the fixed part of this ring is attached to the outer circumference of the riser part of the commutator segment to which the armature coil is connected. By fixing, it is possible to prevent each segment from being separated from a predetermined position by centrifugal force when the armature rotates at high speed, and to improve the centrifugal force strength of the commutator segment. That is, there is an excellent effect that the above effect can be achieved with only one ring.

[Brief description of drawings]

The attached drawings are vertical cross-sectional views of a partially cut main part showing the configuration of an embodiment of a starter according to the present invention. 1 ... Armature, 1a ... Armature coil, 2 ... Commutator, 2a ... Segment of commutator, 2b ...
Riser part, 3 ... Ring, 3a ... Ring fixing part, 3b ...
… Ring shield, 3c… Sliding contact, 4… Brush, 5…
… Brush holder, 8 …… Pinion

Claims (1)

(57) [Claims] 1. A vertical starter in which a pinion meshing with a ring gear of an internal combustion engine is arranged so as to face upward, and a sliding contact portion with which a brush comes into sliding contact, and a pinion side of the sliding contact portion, and an armature coil. While having a commutator having a plurality of segments consisting of a riser portion to which is connected, an armature that drives the internal combustion engine by rotating the pinion, and a fixed portion fixed to the outer periphery of the riser portion of the plurality of segments. A ring having a shielding portion that protrudes radially outward from the fixing portion and that shields the brush and a brush holder that holds the brush, a starter.