Patent ID: 9341252
Filing Date: 2016-05-17
CPC Classification: F16H,Y10T

Claim Text:
1. A wave generator for a strain wave gearing in which a cylindrical externally toothed gear capable of flexing in a radial direction is caused to flex ellipsoidally and partially mesh with both a rigid first internally toothed gear and a rigid second internally toothed gear coaxially arranged adjacent to the first internally toothed gear, the wave generator comprising: a first wave generator portion for causing a first externally toothed gear portion on one side of the externally toothed gear in a tooth trace direction thereof to flex ellipsoidally and partially mesh with the first internally toothed gear, and a second wave generator portion for causing a second externally toothed gear portion on the other side of the externally toothed gear in the tooth trace direction to flex ellipsoidally and mesh with the second internally toothed gear; the number of teeth on the first internally toothed gear being 2n more than the number of teeth on the externally toothed gear, assuming n to be a positive integer, and the number of teeth on the second internally toothed gear being equal to the number of teeth on the externally toothed gear; the first wave generator portion having an ellipsoidal contour defined by a first ellipsoidal curve, and the second wave generator portion having an ellipsoidal contour defined by a second ellipsoidal curve; a circumference of the first ellipsoidal curve being equal to a circumference of the second ellipsoidal curve; a major axis of the first ellipsoidal curve being identical to a major axis of the second ellipsoidal curve; and a minor axis of the first ellipsoidal curve being shorter than a minor axis of the second ellipsoidal curve.