Patent ID: 9175657
Filing Date: 2015-11-03
Classification: F02N,Y10T

Abstract:
1. An engine starting device comprising: a motor unit; a pinion gear unit which rotates according to the rotation of an output rotation shaft driven by the motor unit; and a pushing mechanism which moves the pinion gear unit towards an engagement location of a pinion gear and an engine starting gear, wherein an engine is started by a rotation force of the motor unit through the pinion gear and the engine starting gear which are engaged with each other, the pinion gear unit includes a rotation member which rotates according to the rotation of the output rotation shaft, a first pinion gear which is fit to the rotation member through a first serration unit, rotates with the rotation member according to the rotation of the output rotation shaft, and moves with the rotation member when the pinion gear unit moves towards the engagement location by the pushing mechanism, to be initially engaged with the engine starting gear, and a second pinion gear which is fit to the rotation member to be adjacent to the first pinion gear through a second serration unit, rotates with the rotation member according to the rotation of the output rotation shaft, and moves with the rotation member when the pinion gear unit further moves towards the engagement location by the pushing mechanism, to be engaged with the engine starting gear later than the first pinion gear, in a state where the first pinion gear is engaged with the engine starting gear, and the first pinion gear and the second pinion gear are configured to be moved toward each other in the circumferential direction at the time of assembly, thereby the fitting is performed by the first and second serration units so that phases of teeth of the first pinion gear and teeth of the second pinion gear in a circumferential direction correspond with each other.