| 摘要 |
1,205,549. Toothed gearing. USM CORP. 31 July, 1969 [2 Aug., 1968], No. 38372/69. Heading F2Q. In an harmonic drive comprising a flexspline meshing a circular toothed member, the width of each of the teeth 12 of the circular member 10 along the pitch circle is of at least a width approaching twice that of each of the teeth 18 of the flexspline 14 along that circle so that the root localities of the flexspline teeth are subjected to lower stress concentration than when the widths of the teeth of the circular spline member and of the co-operating flexspline are approximately equal. The flexspline 14 is tubular and is secured to an output shaft 16. An input shaft 22 carries an ellipsoidal cam 26 which acts through balls 32 to effect progressive meshing of the flexspline teeth 18 with the teeth 12. Preferably the width of a space between adjacent teeth 18 of the flexspline corresponds to the width of one of the teeth 18 or to a low multiple thereof. |
