| 摘要 |
A water proof structure for a use in a starter motor comprising a front bracket, an over-running clutch axially slidably supported on a rotary shaft, and a pinion mounted to the over-running clutch and movable between a forward position for engagement with an engine ring gear and a rearward position for disengagement from the engine ring gear. The front bracket includes a tubular wall 22 surrounding the over-running clutch and having formed therein an opening for allowing the pinion in the forward position to be projected therethrough and a moisture drain opening 20c in its bottom. The water proof structure comprises a radial wall 25 extending from the front bracket toward a front end of the pinion in the forward position for substantially closing a gap between the tubular wall and the pinion. At the corner of the bottom portion of the radial wall and the tubular wall, a moisture drain hole 27 is provided.
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