Patent ID: 7578763
Filing Date: 2009-08-25
Classification: F16H

Abstract:
1. A drive shaft reduction gear comprising: a driven body rotatably supported by a drive shaft housing via a bearing; a drive shaft passing through an inner side of the drive shaft housing and transmitting a rotation to the driven body; and a planetary gear mechanism arranged between the drive shaft and the driven body and reducing a rotation of the drive shaft so as to transmit the rotation to the driven body, wherein a sun gear in the planetary gear mechanism is supported by the drive shaft so as to be integrally rotatable, a carrier supporting a planetary gear in the planetary gear mechanism is supported by the driven body so as to be integrally rotatable, a ring gear in the planetary gear mechanism is non-rotatably supported by the drive shaft housing, and the ring gear has a ring gear hub extending in a radial direction from the ring gear and a shaft portion extending in an axial direction from the ring gear hub, wherein the shaft portion of the ring gear is non-rotatably supported by an inner peripheral surface of a shaft portion of the drive shaft housing, and wherein the drive shaft reduction gear further comprises: a bearing holder attached to the drive shaft housing and holding the bearing in an axial direction; and locking means for regulating a movement in the axial direction of the ring gear, the locking means being provided in the bearing holder.