Motor power train and method of assembling the same

Abstract

A motor power train which includes a reducer for amplifying motor drive torque, a differential device with a clutch mechanism and a differential gear unit to allocate the drive torque to wheels, and a casing for housing them. The reducer includes a first shaft as an input shaft; a second shaft to which the drive torque is transmitted form the first shaft; a first reduction gear set with a first gear on the first shaft and a second gear on the second shaft; and a second reduction gear set with a third gear on the second shaft and a fourth gear provided on the clutch mechanism of the differential device. The fourth gear and a large-diameter portion of the differential gear unit are offset in axial position without overlapping.

1 - 11 . (canceled)  
     
     
         12 . A method of assembling a power train unit which comprises: 
 a reducer including first and second gears interconnected to each other;    a differential including a differential case rotatable about a rotation axis of the first gear relative to the first gear;    a clutch for connecting the first gear to the differential case; and    a casing for housing the reducer, the differential, and the clutch, the casing being divided into a first part and a second part, the method comprising:    sub-assembling the first gear, the clutch, and the differential onto the first part of the casing;    sub-assembling the second gear and a shaft thereof onto the second part of the casing;    setting a bearing for supporting the shaft of the second gear on the first part of the casing; and    putting the first and second parts together, inserting the shaft of the second gear sub-assembled onto the second part into the bearing set on the first part.