| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw capable of preventing the occurrence of a step being caused by the occurrence of vibration to a boundary part between a ball load rolling path and a ball circulation path, without increasing so much precision of fitting-in between a through-hole for scooping up a nut ball or a through-hole for ball return and the cylindrical part of a ball circulation member. SOLUTION: A ball circulating member 17 to circulate a ball 15 has a cylindrical part 21 fitted in each of a through-hole 19 for scooping up a ball bored in a ball circulation member mounting surface 12a of a nut, and a through-hole for ball return. The cylindrical part 21 is provided with a protrusion part 30 engaged with a ball screw groove on the non-load zone side of a nut 12 to position the ball circulation member 17. COPYRIGHT: (C)2005,JPO&NCIPI
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