Patent ID: 7649290
Filing Date: 2010-01-19
Classification: F16C

Abstract:
1. A compound movement device, comprising: a spline shaft having a plurality of ball rolling grooves extending in an axial direction; a spline nut assembled to the spline shaft through an intermediation of a large number of balls and capable of reciprocating in the axial direction; a housing formed as a stepped cylindrical member having a large diameter portion and a small diameter portion that are continuous with each other, with the spline shaft extending through the large diameter portion and the small diameter portion, the large diameter portion being used as an accommodating portion for the spline nut, and an outer peripheral surface of the small diameter portion being used as a mounting surface for a rotation transmitting member; and a bearing member fixed to the small diameter portion of the housing, for supporting advancement and retreating of the spline shaft, and a bearing bush for supporting an axial reciprocating movement of a shaft member, said bearing bush has a receiving hole through which the shaft member is passed, and grooves are formed sequentially at predetermined intervals in an inner peripheral surface facing the receiving hole, with the inner peripheral surface being in press contact with the shaft member.