| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planetary gear mechanism capable of reducing play of gears in normal and reverse rotations regardless of a backlash amount of an engagement portion of gears. <P>SOLUTION: In a planetary gear reduction gear 1, a planetary gear set comprises a reference phase planetary gear set comprising spur gears and at least one planetary gear set with a different phases. The planetary gear set with an unmatched phase has a phase difference, which is a difference of gear positions in a rotation direction of the gears between planetary gears 6a to 6d and the driven planetary gears 7a to 7d, when the backlash of engaged portions of a fixed internal gear 8 and the planetary gears 6a to 6d, a driven internal gear 9 and driven planetary gears 7a to 7d is 0. In the planetary gear set with an unmatched phase, the phase difference between the planetary gears 6a to 6d and the driven planetary gears 7a to 7d is different from that of the reference phase planetary gear set. Accordingly, with the above configuration, play corresponding to the phase difference between the reference phase planetary gear set and the planetary gear set with a different phase can be decreased. <P>COPYRIGHT: (C)2012,JPO&INPIT |
