Patent ID: 9744844
Date: 2017-08-29
CPC Classifications: B60B,B60K,B60L,F16D,F16H,H02K,Y02T

Claim:
1. A motor drive unit, in which an output end of a motor drive system using an electric motor as a power source and a rotator rotatably supported by a bearing unit are arranged side by side in an axial direction, and the output end of the motor drive system and the rotator are drivingly coupled in a relatively displaceable manner by a coupling member in which a plurality of couplers spaced apart in an axial direction are set, wherein: the coupling member is an output shaft inserted in a center hole in the rotator, one of a pair of couplers is a motor-side coupler drivingly coupled in an axial displaceable and swinging displaceable manner to the output end of the motor drive system, the motor-side coupler set such that an opposite end of the coupling member protruding from the rotator is drivingly coupled to the output end of the motor drive system in an axially displaceable and swinging displaceable manner, another of the pair of couplers is a rotator-side coupler drivingly coupled in an axial displaceable and swinging displaceable manner to the rotator, the rotator-side coupler set such that an inserted end of the coupling member is drivingly coupled to the rotator in an axially displaceable and swinging displaceable manner, at an axial position of the rotator farther away from the output end of the motor drive system than the bearing unit, the bearing unit of the rotator is arranged such that a center of displacement of the rotator defined by the bearing unit is located between the motor-side coupler and the rotator-side coupler, and the pair of couplers is configured to accommodate a displacement of a plurality of displacements of the rotator, the plurality of displacements of the rotator comprising a parallel displacement, a swinging displacement, and an axial displacement, the output end of the motor drive system is sealed to an axially butting end of the rotator, whereby a seal member defining a lubricant sealed-in space for the rotator-side coupler and the motor-side coupler is provided on the axially butting end of the rotator.