| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain a favorable life of a planetary bearing by enabling the planetary bearing to be sufficiently supplied with a lubricant.SOLUTION: A planetary reduction gear 1 includes in a case 2 supplied with a lubricant: a planetary gear 21 which revolves in an internal gear 27 with a sun gear 13 as a center; and a carrier 6 which supports a planetary shaft 22 located at an axial center of the planetary gear 21, and accommodates the sun gear 13 in the axial center. The planetary reduction gear 1 further includes in the carrier 6, a front-side support part 16A and a rear-side support part 16B which are located in a fore-and-aft direction with the planetary gear 21 placed therebetween, and support ends of the planetary shaft 22, respectively. A recess 29 which reaches the planetary shaft 22 at its external peripheral side, and communicates with a penetration hole 25 at its internal peripheral side is formed at a front face of the rear-side support part 16B, and a lubricant can reach the planetary shaft 22 via the recess 29.</p> |
