Patent ID: 7819770

Claim:
An oscillating internally meshing planetary gear system comprising: an internal gear; an external gear internally meshing with the internal gear, an eccentric body mounted on an eccentric body shaft; the system being configured such that one of the internal gear and the external gear is oscillatingly rotated by the eccentric body mounted on the eccentric body shaft; a sliding motion-facilitating member intervening between an outer periphery of the eccentric body, and one of the internal gear and the external gear that is oscillatingly rotated; and an eccentric body shaft bearing configured to support the eccentric body shaft, wherein the sliding motion-facilitating member has a same configuration and a same size as that of the eccentric body shaft bearing, wherein the sliding motion-facilitating member and the eccentric body shaft bearing each comprises a needle bearing, and wherein the eccentric body shaft also serves as an inner ring of the needle bearing.