Planetary gear apparatus.

摘要

A planetary gear apparatus has an external gear 24 mounted on an input shaft 21 through an eccentric member 22, and an internal gear 26 which engages with the external gear and is concentric with respect to an output shaft 30. A recess 31 is provided in the output shaft 30, and internal or external splines are provided on either the inner or outer side of the recess so as to be concentric with respect to the output shaft 30. The external gear 24 has either a carrier or an annular groove provided on the side thereof which is closer to the output shaft. The carrier or the annular groove is provided with internal or external splines so as to be concentric with respect to the external gear 24. The internal or external splines on the output shaft and the internal or external splines on the external gear are operatively connected together by a drive having external or internal splines provided at both ends thereof. The drive 35 is constituted by a hollow shaft having a through-hole 36. The input shaft is received through the through-hole in the drive and is rotatably born within the recess of the output shaft.