| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw suppressing deformation of return pieces. SOLUTION: A pair of the return pieces 41, 42 constituting a return pipe are provided with the pedestal parts 41d, 42d fixed to the outer wall surface of a nut 20, body parts 41a, 42a forming a no-load passage, and plate-like flange parts 41c, 42c provided along the end edge of the outer diameter side of the body parts 41a, 42a, and protruding toward the outer diameter side, respectively. The return pieces 41, 42 are provided with a foundation part 52 fixed by screwing and fastening to the outer wall face side of the nut 20 to sandwich the pedestal parts 41d, 42d between itself and the outer wall face of the nut 20, and return piece positioning members 50, 60 which come into plane contact with the plate-like flange parts 41c, 42c, and have supporting parts 51, 61 for positioning and supporting the return pieces 41, 42 by contacting along a boundary part between the plate-like flange parts 41c, 42c and the outer wall faces of the body parts 41a, 42a. COPYRIGHT: (C)2007,JPO&INPIT
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