Engine starter

An engine starter comprising:

• a motor;
• a pinion-mobile component that includes a pinion gear, which can be engaged to a ring gear provided at an engine side, and is formed in such a way that the pinion-mobile component is linked to an output shaft of the motor by a helical spline and can be slid in an axis direction of the shaft;
• and
• a solenoid switch that includes
• a pushing mechanism for shifting the pinion-mobile component to a position where the pinion-gear is engaged to the ring gear;
• and
• a switch for passing or cutting off an electric current supplied to the motor;
• wherein
• the pinion-mobile component includes;
• an overrunning clutch which is idled when the pinion gear, which is engaged to the ring gear, is driven by the engine via the ring gear so as to be rotated at a rotational speed which is higher than a rotational speed of the output shaft;
• and
• a breaking mechanism in which the overrunning clutch breaks a transmission of a torque, which is generated in accordance with a rotation of the motor and is transmitted to the ring gear, when a value of the torque is a predetermined condition value with respect to a direction where the torque is transmitted to the ring gear.