| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball circulation tube for a ball screw which suppresses the slip of both balls generated in a curved tube portion, and is suitable as a ball circulation path forming component of the ball screw requiring high speed functioning property. SOLUTION: An inner diameter Dt of the curved tube portion 12 is determined to satisfy the condition of Dt<SP>2</SP>-4Dt×Da+2R(Dt-Da)>0, where Da is the outer diameter of a ball 14 and R is the center radius of the curved tube portion 12, and the balls 14 in the curved tube portion 12 are arranged in zigzag. COPYRIGHT: (C)2003,JPO
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