Starting electric motor.

摘要

In a starting electric motor (20) comprising: a movable pinion cylinder (22) slidably mounted on the extension (3) of the output shaft of the motor (20), the movable pinion cylinder (22) having the front end portion formed into a pinion part (22a), the rear end portion formed into a clutch inner part (7b) of an overrunning clutch (7), and the middle portion formed into a slidably supporting surface (22b) held by a first bearing (25) fitted in the front frame (1), the shaft extension (3) being supported by the front frame (1) through the movable pinion cylinder (22), the movable pinion clyinder (22) is slidably and rotatably supported on the shaft extension (3) by a second bearing (27) fixedly fitted in an inner cylindrical wall which is extended in the movable pinion cylinder (22) from the clutch inner part (7b) to the middle portion (22b) with a gap (26) relatively large between the inner cylindrical wall and the shaft extension (3).