JPS6421260A - Spherical surface transmission type continuously variable transmission - Google Patents

Abstract

PURPOSE:To prolong the fatigue life of the contact surface by lightening the surface pressure of the contact surface between a spherical driving wheel and a driven wheel by allowing the swing axis line of the spherical driving wheel to pass through the contact point between the driving wheel and the driven wheel and positioning said swing axis line in the range from the limit line a parallel to the revolution axis line of the driven wheel to the revolution axis line of the driven wheel. CONSTITUTION:The power of a driving means 1 is transmitted to an output shaft 3 through a spherical driving wheel 2, driven wheel 4, and a pressing means 5, and speed change is performed by the swing of the spherical driving wheel 2 using a speed change operating means 6. In this case, when the swing axis line of the spherical driving wheel 2 passes through the contact point Q with the driving wheel 2 and the driven wheel 4, and crosses with the limit line (shown by the two-dotted chain line) parallel to the revolution axis line of the driven wheel 4, the contact pattern between both wheels 2 and 4 is the projection surface contact or plain surface contact. When the swing axis line is positioned between the limit line and the revolution axis line (shown by the single-dot chain line) of the driven wheel 4, the contact pattern becomes the projecting surface contact or recessed surface contact, in other words, the inscribed contact, and the surface pressure of the contact surface between the spherical driving wheel 2 and the driven wheel 4 can be reduced.