| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball screw capable of smoothly circulating a rotating member. Ž<P>SOLUTION: The ball screw includes: a shaft body 11 provided with a first rotating groove at an external edge; a nut 12 provided on the shaft and also having a housing hole; a return device 13 provided in the housing hole of the nut; and a rotating member X provided on the return device 13. In the ball screw, a through hole 121 is formed in the nut, a second rotating groove 1211 corresponding to the first rotating groove 111 is formed at the internal edge of the through hole, the first and second rotating groove forms a load path, at the external edge of the nut, two housing holes 123 and an axial hole 122 communicated with the housing hole are formed, the stretching direction of the housing hole is the same as the extension direction of the center line of the load path, on the return device, a return path 131 and a contact face 132 are formed, each of both ends of the return path is connected to the load path and the hole in the shaft direction, thereby providing a circulation circuit, and the rotating member X is installed in the circulation path, thereby mutually rotating the shaft body and the nut to transmit power. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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