Planetary gear apparatus

摘要

A planetary gear apparatus whose gears 21, 22, 23 and 24 are all constituted by continuous shifted gears. A backlash between the input sun gear 21 and each of the input side planetary gears 23 is adjusted by pressing a second carrier plate 26 supporting each integrated pair of the input side planetary gears 23 and the output side planetary gears 24 and moving it in the axial length direction by a ball bearing 29 by a screwing operation of an adjusting nut 29a. A backlash between the output sun gear 22 and each of the output side planetary gears 24 is also adjusted by pressing the output sun gear 22 and moving it in the axial length direction by the ball bearing 19 by the screwing operation of the adjusting nut 19a. Accordingly, the backlash of all meshing portions can be adjusted during or after completion of the assemblage.