| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in a resin gear of a ball screw device that as the resin gear is formed by injection molding a resin onto an outer peripheral part of a nut member, the distortion may generate on the nut member accompanying the contraction of the resin, and a thread groove must be repolished when the distortion reaches the thread groove. SOLUTION: As the distortion generated on the nut member 3 when the gear 4 is formed by injecting the resin, is corrected by correcting a raceway diameter by press-fitting a first single-row ball bearing 5 into a thin part 14 of the nut member 3, the troublesome work such as repolishing the raceway diameter of a raceway groove 9 becomes unnecessary, and the manufacturing cost can be reduced. COPYRIGHT: (C)2004,JPO&NCIPI
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