Planetenradgetriebevorrichtung.

摘要

A planetary gear apparatus includes: an external gear (34) mounted on an input shaft (31) with an eccentric member (32) and a bearing (33) fitted onto the eccentric member therebetween; an internal gear (36) engaging with the external gear (34), the internal gear (36) being coaxial with respect to the input shaft (31); an output shaft (39) for outputting a reduced rotational force; and a drive (41) for coupling the external gear (34) and the output shaft (39). The planetary gear apparatus is adapted to transmit the rotational force of the input shaft (31) to the output shaft (39) after it has reduced the speed thereof, or to transmit the rotational force of the output shaft (39) to the input shaft (31) after it has increased the speed thereof, by fixing the internal gear (36). The external gear (34) has a ring-like shape. The inner peripheral surface of the external gear (34) is provided with a hole (38) into which the bearing (33) that is fitted onto the eccentric member (32) is fitted, and splines (38) are formed on the insertion hole (38) over the entire external gear (34) in such a manner that they are coaxial with respect to the external gear (34). The bearing (33) having a width shorter than that of the splines (38) is fitted into one end side of the bearing insertion hole (38), and the drive (41) having an end provided with splines (42) is engaged with the other end side of the bearing insertion hole (38). The other end of the drive (41) is provided with splines or spline grooves (43) which are engaged with spline grooves or splines (40) provided in the output shaft (39).