FLEXIBLE MESHING TYPE GEAR DEVICE

摘要

The purpose is to minimize the increase in friction-induced backlash of an external gear or internal gear. In a flexible meshing type gear device (100) provided with a vibrator (104), an external gear (120), and an internal gear (130), two meshing parts (129A, 129B) of the external gear (120) and the internal gear (130) have a first area (Fp) and a second area (Sp) situated further towards the inside in the axial direction (O) than the first area (Fp). In the first area (Fp), a gap (Gp) is furnished to the inside in the radial direction (R) of the external gear (120). In the external gear (120) in the state prior to assembly, the tooth tip diameter in the section corresponding to the first area (Fp) is larger than the tooth tip diameter in the section corresponding to the second area (Sp), and the rate of change in the tooth tip diameter in the axial direction (O) differs between the first area (Fp) and the second area (Sp).