Wave gear device, the frictional engagement type of wave devices, and the wave generator

摘要

The external gear (13) of the wave gear device (11) is deflected into a shape along the elliptic curve by the wave generator (14). The external gear (13) meshes with the internal gear (12) at the long diameter position of the elliptic curve. These two meshing positions (L1) gradually change in the circumferential direction of the two gears (12, 13) along the tooth trace direction (A). It is possible to increase the number of external teeth (13 e) of the external gear (13) participating in meshing with the internal gear (12). It is possible to realize a wave gear device having high rigidity and capable of reducing vibration noise.