PLANETARY GEAR DEVICE

摘要

[PROBLEMS] To provide a planetary gear device capable of effectively reducing gear noise and wear by preventing a carrier from falling by stably holding a sun gear and the carrier. [MEANS FOR SOLVING PROBLEMS] The sun gear (41) is spline-coupled to an input shaft (3) and the carrier (45) is rotatably supported on the input shaft (3) through bushes (56). Bearing mounting parts (41b) and (45b) opposed to each other in the radial direction and extending to the inner diameter side of pinion gears (43) are formed integrally with the sun gear (41) and the carrier (45), and a ball bearing (57) is installed between these bearing mounting parts. The center of the ball bearing (57) is located near the center of engagement of the pinion gear (43) in the axial direction.