JPH0355671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waterproof structure for an inertial diving starter motor for use in marine applications, etc., in which the pinion faces upward.

In the conventional type, since the pinion faces upward, water splashes onto the housing bearing and enters the inside of the starter motor, causing problems such as poor sliding.

In order to solve the above-mentioned problems, the present invention aims to provide a waterproof structure by extending the clutch cover into a cylindrical shape and covering the housing bearing part to form a labyrinth.

More specifically, the clutch cover is extended into a cylindrical shape, and the clutch cover is fixed to the clutch outer by tightening the clutch cover. The bearing portion of the housing is provided with an annular recess, and the lower end of the clutch cover is disposed within the recess to form a labyrinth within the recess. This structure prevents water from entering the inside of the housing. Further, in this structure, water accumulated in the labyrinth portion can be drained through a drainage hole provided in the housing.

The present invention will be described below with reference to embodiments shown in the drawings. In the figure, 1 is the front housing;
A is its cylindrical bearing portion, and 1b is its drain hole. Reference numeral 2 designates a clutch cover, and a cylindrical portion extending from one end of the clutch cover overlaps the outer periphery of the bearing portion 1a through a certain gap when the starter motor is not in operation. Reference numeral 2b denotes a seaming portion provided at the other end of the clutch cover, which is secured to the clutch outer 3 by seaming. 4 is a clutch roller stored in a wedge chamber on the inner circumference of the clutch outer 3, and 5 is a clutch inner that is attached to the clutch outer 3.
is inserted into the inner periphery of the roller 4 via a roller 4, and a pinion 6 is integrally formed at one end of the roller 4. 7 is an armature shaft, and a pinion 6 is rotatably held via a bush 8. 9 is shaft 7
A helical spline formed on the outer periphery of the clutch outer 3 meshes with a helical spline 10 formed on the inner periphery of the clutch outer 3. Numeral 11 is a bush provided on the inner periphery of the bearing portion 1a of the housing 1, and holds the shaft 7 in the housing 1 so as to be rotatable. 12 is a stop ring fixed to the tip of the shaft 7, and 13 is a return spring arranged between the stop ring 12 and the pinion 6. This configuration is used in a marine engine, and is installed with the pinion 6 facing upward. Further, an annular recess 14 into which the cylindrical portion 2a of the clutch cover 2 is inserted is formed on the outer periphery of the bearing portion 1a of the housing 1, and the bottom of this recess 14 and the outer periphery of the housing 1 are communicated through a drain hole 1b. , this drainage hole 1
b is inclined so that the outer peripheral side is located on the lower side.

In the above configuration, when the starter switch is turned on, the armature shaft 1 rotates, and by the action of the helical splines 9, 10, the clutch outer 3, pinion 6, etc. advance upward from the rest position shown in the figure until they come into contact with the stop ring 12, The pinion engages with the unshown ring gear and starts the engine. When the starter switch is turned off after starting the engine, the return spring 13 returns the pinion 6, outer 3, etc. to the rest position shown in the figure.

Here, in this state of the rest position (when not in operation), the cylindrical part 2a of the clutch cover 2 is inserted into the recess 14 on the outer periphery of the bearing part 1a of the front housing 1, and the bearing part 1a and the cylindrical part 2a are connected to each other. Since the overlap forms a maze as shown by the arrow in the figure, it is possible to prevent water from entering the inner periphery of the bearing portion 1a (inside the starting motor). Moreover, since the water that has entered the recess 14 is drained out of the housing 1 through the drain hole 1b due to its own weight, it is possible to more reliably prevent water from entering the inner periphery of the bearing portion 1a.

Note that since the operating time of the starter motor is short, the cylindrical portion 2a and the bearing portion 1a may or may not overlap during operation.

In addition, in the embodiment described above, the seaming portion 2b
Although the cylindrical cover 2 is provided on the pinion 6 side, the cylindrical portion 2a may be formed by winding the cylindrical cover 2 on the housing 1 side.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an embodiment of the configuration of essential parts of the electric motor of the present invention. 1...Front housing, 1a...Bearing part,
1b...Drain hole, 2...Clutch cover, 2a...
...Cylindrical portion, 6...Pinion, 14...Concave portion.

Claims (1)

[Scope of Claims] 1. A housing, a shaft rotatably supported by a bearing portion of the housing and extending outward from the housing and in a vertical direction, a unidirectional clutch provided on the outer periphery of the shaft, and a unidirectional clutch provided on the outer periphery of the shaft; a pinion provided on the outer periphery of the pinion and configured to rotate a ring gear of the internal combustion engine by transmitting the rotation of the shaft through the clutch; and a cylindrical clutch cover surrounding the outer periphery of the clutch at its upper end, the bearing portion An annular recess is provided on the outer periphery of the clutch cover, and the lower end of the clutch cover is disposed within the annular recess to form a maze within the annular recess, and the bottom of the annular recess and the housing A penetrating plunge-starting motor characterized by communicating with the outer periphery through a drainage hole.