Variable ratio power transmission means

In a continuously variable power transmission including first and second rolling members in rolling contact with one another, the improvement characterized in that said rolling members are truncated cones generated around axes, having concave circumferential surfaces, being substantially parabolic in axial section and including straight rolling contact lines oriented at a compound angle to the axes of the cones;

• the cones being in continuous line contact along the rolling contact lines at a common line of contact which is fixed with respect to the axes of the cones;, whereby during linear movement of one cone with respect to the other in a direction substantially parallel to the common line of contact the rotational velocity of one cone with respect to the other cone changes.

In a continously variable power transmission, truncated cones in rolling contact with one another, each cone having a circumferential surface which is concave in axial section and has as a generatrix a straight line which extends in an oblique direction with respect to the axis of the cone without intersecting the apex of the cone;

• the cones being in contact with one another along a common rolling contact line which common rolling contact line is coincident with the generatrix of each cone, whereby said cones change relative rotational velocity during linear movement of one cone with respect to the other in a direction substantially parallel to the common contact line.