Starter for internal combustion engine

Details Starter for internal combustion engine Starter for internal combustion engine

2001-12-27

2004-06-22

Tamai, Karl (Department: 2834)

Prime-mover dynamo plants

Electric control

Electric-starting motor

C290S046000, C290S048000, C074S00700R, C074S00700R, C310S083000, C310S089000

Reexamination Certificate

active

06753621

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application 2001-17836 filed Jan. 26, 2001, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a starter for driving an internal combustion engine that has a planetary gear speed reduction mechanism.
2. Description of the Related Art
Usually, a starter for a vehicle subjected to water splashing, such as a recreational vehicle, is equipped with a water drainpipe extending from a motor case of the starter, as shown in Japanese Patent 2847943. Recently, since various accessories have been newly introduced into an engine compartment of a car, the space of the engine compartment for a starter has been narrowed. As a result, the water drainpipe may interfere with other accessories if it is too long.
SUMMARY OF THE INVENTION
Therefore, a main object of the invention is to provide an improved starter for a recreational vehicle that does not require a long water drainpipe.
According to a feature of the invention, a starter for an internal combustion engine is comprised of an armature having an armature shaft, a motor case, a planetary gear speed reduction mechanism connected to the armature shaft, a frame for covering the planetary gear speed reduction mechanism and a partition plate forming a motor chamber and a speed reduction chamber. The partition plate has an armature-shaft hole and a chamber-connection passage between the armature shaft hole and the armature shaft to connect the motor chamber and the speed reduction chamber. A long circumferential groove is formed between the partition plate and the frame to connect the speed reduction chamber and the outside.
Therefore, a long ventilation passage is formed to connect the motor chamber, the speed reduction chamber and the outside. Even if the starter is covered with water, water is obstructed by the long ventilation passage.
A seal member may be disposed between the frame and the partition plate to prevent lubrication oil from leaking out from the speed reduction chamber. Preferably, a plurality of projections may project into the circumferential groove to form a labyrinth in the groove, and the circumferential groove opens outside at an outer vent disposed behind a through bolt.
Therefore, the plurality of projections effectively prevents water from getting into the inside of the starter.


REFERENCES:
patent: 5053633 (1991-10-01), Sugiyama et al.
patent: 5156057 (1992-10-01), Isozumi
patent: 5307700 (1994-05-01), Spellman et al.
patent: 5688203 (1997-11-01), Yamamoto et al.
patent: 5751070 (1998-05-01), Nagao et al.
patent: 5844336 (1998-12-01), Ohya et al.
patent: 5901604 (1999-05-01), Sato et al.
patent: 6035732 (2000-03-01), Ogishima et al.
patent: B2 2847943 (1998-11-01), None

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