Patent ID: 9670892
Date: 2017-06-06
CPC Classifications: F02N,H01H

Claim:
1. An engine startup device, comprising: a motor that produces torque with electric power supplied thereto; an output shaft on which is formed a first helical spline that transmits the torque from the motor; a moving body that has a second helical spline engaging with the output shaft and transmits the torque from the motor to an engine side; and an electromagnetic switch equipped with a mechanism that independently performs a function of magnetizing a motor-operating plunger by activating a motor-operating solenoid coil and switching on/off the power to the motor by the movement of the motor-operating plunger, and a function of magnetizing a moving-body-operating plunger by activating a moving-body-operating solenoid coil and thrusting out the moving body towards a ring gear side via a thrust-out mechanism by the movement of the moving-body-operating plunger; wherein a notch is formed on a power-transmitting-side tooth surface of at least one from among the first helical spline and the second helical spline of the output shaft and the moving body, and the helical splines of the output shaft and the moving body are arranged in such a way that the notch of the either one of the output shaft and the moving body engages with part of the helical spline of the other when the engine startup device stopping.