Extended flexspline arrangement

F - Mech Eng,Light,Heat,Weapons – 16 – H

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74/204

F16H 1/10 (2006.01) F16H 49/00 (2006.01)

Patent

CA 1216439

Abstract A strain wave gearing assembly (Harmonic Drive transmission) having a housing encircling a circular spline within which is journalled a flexspline. The flexspline has an annular array of gear teeth thereon, which flexspline has an inner bore having a diameter defined as D. The circular spline also has an annular array of gear teeth mateable with those of the flexspline. A wave generator is mounted within the flexspline. The flexspline has a lip which extends longitudinally beyond the distal edge of its annular array of gear teeth by 10% to 40%D. The lip is of radially thickening dimensions from immediately adjacent the outer edge of the annular array of gear teeth thereon, and from a thickness of about 1%D up to a thickness of about 3%D at the distal edge of said flexspline, to minimize the skewing of the ellipsoidal deflection wave of the flexspline.

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