Patent ID: 7976426

Claim:
A shift cam disc for facilitating a ratio shift of a continuously variable transmission (“CVT”), the CVT having a longitudinal axis and a ball-leg assembly, wherein the ball-leg assembly is provided with a ball coupled to a set of legs, each leg coupled to a cam wheel, the shift cam disc comprising: a surface following the x and y values of the datum curve according to a set of parametric equations of the form: theta=2*gamma_max* t −gamma_max x=LEG *sin(theta)−0.5*ball_dia* RSF *theta*pi/180+0.5 *ARM *cos(theta) y=LEG *cos(theta)−0.5 *ARM *sin(theta) wherein theta is a variable representing a tilt angle of the ball-leg assembly, gamma_max is a variable representing a maximum tilt angle of the ball-leg assembly, t is a parametric range variable, x and y are variables representing a center point with respect to an x-y coordinate system of the cam wheel, wherein an x-axis is substantially parallel to the longitudinal axis, LEG is a variable representing a perpendicular distance between a centerline of the ball and a centerline of the cam wheels, ball_dia is a variable representing a dimension of the ball, RSF is a variable representing a roll-slide factor, and ARM is a variable representing a distance between the cam wheels.