| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planetary rotation/linear motion converter in which planetary shafts arranged around the circumference of a sun shaft hold the sun shaft in a well-balanced state. Ž<P>SOLUTION: The planetary rotation/linear motion converter includes: the sun shaft 1 having a sun gear 11 and a helical ridge 12; the planetary shafts 4 having planetary gears 41 meshing with the sun gear 11 of the sun shaft 1 and helical grooves 42 meshing with the helical ridge 12 of the sun shaft 1; and a nut 2 having an internal gear 21 meshing with the planetary gears 41 of the planetary shafts 4 and a helical ridge 22 meshing with the helical grooves 42 of the planetary shafts 4. When the nut 2 is rotated relative to the sun shaft 1, the sun shaft 1 linearly moves relative to the nut 2 in the axis direction of the nut 2. The 3×n planetary shafts 4 are arranged equally spaced around the circumference of the sun shaft so that meshing phases between the planetary gears 41 of the three planetary shafts 4 where a phase angle is shifted by 120 degrees are identical to one another. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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