| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wave gear device and a transmission ratio variable device of which vibration and operation sound can be reduced.SOLUTION: A wave gear device 16 comprises: a pair of circular splines 41, 42 coaxially arranged side-by-side; a cylindrical flexible spline 43 coaxially arranged side by side with each of the circular splines 41, 42 inside each of the circular splines 41, 42; and a wave producer 44 arranged inside the flexible spline 43. The wave producer 44 flexes the flexible spline 43 into an elliptical shape and causes outer teeth 43a of the flexible spline 43 to be partially engaged with inner teeth 41a, 42a of each of the circular splines 41, 42 and at the same time an engaged location between the flexible spline 43 and each of the circular splines 41, 42 is rotated. Then, an axial one of a cylindrical part 51 of the flexible spline 43 is formed with an annular reinforcing part 52 extended out inside a diametrical direction.</p> |
