Starter motor having seal member for sealing axial end of housing

摘要

A front end of a starter motor housing is sealed by a resilient seal member disposed between a bearing and a front end wall of the housing. A shaft carrying a pinion at its front end is rotatably and slidably supported by the bearing in an over hang fashion. The seal member is a cup-shaped ring having a circular outer wall, a bottom wall and a center hole. A sealing lip slidably contacting the rotating shaft is formed around the center hole. The circular outer wall of the seal member is tightly and hermetically held between an outer ring of the bearing and front end wall of the housing, so that the seal member is not displaced in the axial direction. The bottom wall is S-shaped forming a depressed portion facing the bearing to provide more space for retaining lubricant therein.