PLANETENGETRIEBE

摘要

A planetary gear device (20) comprises a first-stage side planetary gear mechanism (22) and a second-stage side planetary gear mechanism (23). The first-stage side planetary gear mechanism (23) includes an internal gear (25), a carrier (29) rotatably supported by a pair of main bearings (26, 27) disposed on both sides of the internal gear (25), a plurality of planetary gears (31) rotatably supported round a plurality of planetary shafts (30) extending between a pair of right and left carrier portions (28A, 28B) of the carrier (29), a sun gear (33) provided round the outer circumference of a pinion shaft (32) extending in the axial direction of the gear device through the carrier (29), and an output shaft (34) connected to the carrier (29) and extending in the direction of the axis (20a) of the gear device. The carrier (29) and the output shaft (34) are formed as a unitary member, and a pin so driven as to extend between the portions (28A, 28B) of the carrier (29) fabricated as the unitary member is used as the planetary shaft (30). Therefore, the planetary gear device (20) has a reduced number of components, can be produced easily and has high assembly accuracy.