Patent ID: 8418571
Filing Date: 2013-04-16
Classification: F02N,F16D,Y10T

Abstract:
1. An engine starter, comprising: an output shaft connected to a rotary shaft of a motor; a clutch which is slidably connected to the output shaft such that the clutch is slidable along an axial direction of the output shaft, the clutch for transmitting a rotation force applied in one direction of the output shaft; and a pinion gear provided to the clutch and meshing with a ring gear, wherein: the clutch comprises: one of an inner peripheral surface of the clutch outer and an outer peripheral surface of the one end portion of the clutch inner is formed with a notch portion of a tapered shape along the peripheral direction; the notch portion forming a wedge-shaped space defined by the clutch outer and the one end portion of the clutch inner, and on a narrower side of the wedge-shaped space, a lock portion protruding along a radius direction and capable of abutting on the roller; and the rolling contact surface of the roller is applied with carbonitriding treatment, wherein the rolling contact surface applied with the carbonitriding treatment has an effective depth which is larger than a biting depth of the roller into one of the clutch inner and the clutch outer when the roller abuts on the lock portion.