Patent ID: 8997607
Filing Date: 2015-04-07
Classification: F16H,Y10T

Abstract:
1. A wave gear device comprising: a flexible internally toothed gear; a rigid externally toothed gear disposed on an inner side of the flexible internally toothed gear and configured to function as a rotation output member; and, a wave generator for flexing the flexible internally toothed gear into an ellipsoidal shape to mesh partially with the rigid externally toothed gear, and for moving meshing positions of the two gears in a circumferential direction, wherein the flexible internally toothed gear has a cylindrical barrel part capable of flexing in a radial direction thereof, at least one end of the cylindrical barrel part being an open edge, the cylindrical barrel part has an outer peripheral surface with no external teeth and an inner peripheral surface including an internal-tooth-formation portion and a pushed portion, the internal-tooth-formation portion where internal teeth are formed, and the pushed portion pushed by the wave generator so as to flex the internal-tooth-formation portion into an ellipsoidal shape, the internal-tooth-formation portion and the pushed portion are formed in different positions of the inner peripheral surface of the cylindrical barrel part when viewed along a direction of a center axis line of the flexible internally toothed gear, the wave generator is disposed on an inner side of the cylindrical barrel part, and pushes the pushed portion in a radial direction thereof from an inner side toward an outer side to flex it elliptically, and wherein no structural components of the wave gear device are located on a radially outward side of the flexible internally toothed gear.