Patent ID: 9163710
Filing Date: 2015-10-20
Classification: F16H,Y10T

Abstract:
1. A wave gear device comprising a rigid internally toothed gear, a flexible externally toothed gear disposed on the inside of the rigid internally toothed gear, and a wave generator which causes the flexible externally toothed gear to flex into an ellipsoidal shape and partially mesh with the rigid internally toothed gear and which causes the meshing positions of the two gears to move in a circumferential direction; the flexible externally toothed gear having a cylindrical barrel part having an open edge in at least one end and being capable of flexing in a radial direction; the cylindrical barrel part has an inner peripheral surface with no internal teeth and an external-tooth-formed portion where external teeth are formed, and a pushed portion pushed in the radial direction by the wave generator in order to cause the external-tooth-formed portion to flex into an ellipsoidal shape; the external-tooth-formed portion and the pushed portion being formed in different regions in the cylindrical barrel part along a direction of a center axis line of the flexible externally toothed gear; and the wave generator being disposed on an outside of the cylindrical barrel part, and being adapted for pushing the pushed portion radially inward from the outside and causing the pushed portion to flex into an ellipsoidal shape, and wherein no structural components of the wave gear device are located on a radially inward side of the cylindrical barrel part of the flexible externally toothed gear.