STRAIN WAVE GEARING, FRICTIONAL ENGAGEMENT WAVE DEVICE, AND WAVE GENERATOR

摘要

An externally toothed gear of a strain wave gearing is made to flex into a shape conforming to an ellipsoidal curve. The externally toothed gear meshes with an internally toothed gear at the major-diameter position of the ellipsoidal curve. These two meshing positions gradually change in the circumferential direction of the both gears along the tooth trace direction. The number of external teeth of the externally toothed gear participating in meshing with the internally toothed gear can be increased. A strain wave gearing which has a high rigidity and is capable of reducing vibrational noise, can be realized.

主权项

1. A strain wave gearing comprising:
a rigid internally toothed gear, a flexible externally toothed gear, and a wave generator for causing the externally toothed gear to flex into a non-circular shape and mesh with the internally toothed gear; meshing positions between the externally toothed gear and the internally toothed gear being multiple positions separated in a circumferential direction of the gears in axially perpendicular cross-sections in a tooth trace direction in the externally toothed gear; and each of the meshing positions gradually changing in the circumferential direction when viewed along the tooth trace direction.