Starter having rotation restricting structure

摘要

A center case (13) has a force-receiving wall (13b) and a fixed wall (13c), and is rigidly fixed in a starter (1). A gear-forming section (22) is coaxially arranged with the center case (13), and has a forcing wall (22b) and a movable wall (22c) on the side of the center case (13). A cushion member (23) is elastically received between the force-receiving wall (13b) of the center case (13) and the forcing wall (22b) of the gear-forming section (22). The fixed wall (13c) and the movable wall (22c) are arranged to have a gap, and oppose each other. When an excessive torque works on the gear-forming section (22) via an internal gear (8), the cushion member (23) absorbs an impact force to move the movable wall (22c) by a predetermined distance. In this case, the movable wall (22c) contacts the fixed wall (13c) so that a compression rate of the cushion member (23) is restricted.