| 摘要 |
<p>PROBLEM TO BE SOLVED: To sufficiently lubricate a bearing around a planetary shaft even when an amount of lubricant sealed in a casing is small, in a planetary gear device having a configuration in which a rotational force is taken out from of a casing being integral with an internal gear by regulating a revolving motion of the planetary shaft.SOLUTION: A planetary gear device 10 has a planetary gear 24 and an internal gear 28A supported by a planetary pin 20 via a bearing (a cylindrical roller) 22. The planetary pin 20 is arranged in a plural number by offsetting from a shaft center of the internal gear 28A. The revolving motion of the planetary pin 20 is regulated in such a manner that rotational output is taken out of a casing 30 which is integral with the internal gear 28A. In the casing 30, lubricant is sealed with the amount in which the bearings around the planetary pins of one part of the plurality of planetary pins 20 are immersed. At a part which rotates integrally with the casing 30, a holding part is provided which holds the lubricant inside when rotating.</p> |
