Patent ID: 9109677
Filing Date: 2015-08-18
Classification: A01D,E05F,E05Y,F16H,Y10T

Abstract:
1. A drive unit comprising: a motor having a motor shaft; an output; and a planetary gear train connecting the motor shaft to the output, comprising a first sun gear driven by the motor, a first ring gear, a first carrier, and a plurality of first planetary gears rotatably supported by and arranged at one side of the first carrier and meshing with the first sun gear and the first ring gear, wherein the first sun gear and the first planetary gears are helical gears having helical teeth and helical teeth are formed on an inner surface of the first ring gear and mesh with the helical teeth of the first planetary gears; wherein the planetary gear train comprises a second ring gear connected to the first ring gear, and quick aligning structure that extends in an axial direction of the motor is formed between the first and second ring gears; wherein the drive unit further comprises a connecting piece for fixing the planetary gear train to the motor, a mounting piece for holding a bearing; and a plurality of fasteners that passes through the mounting piece, the second ring gear, the first ring gear and the connecting piece to fasten them together.