Patent ID: 8133149

Claim:
A system for generating axial force in a continuously variable transmission (“CVT”) having a central shaft, the system comprising: a torsion spring mounted coaxially about the central shaft of the CVT; a first load cam disc having a plurality of ramps; a plurality of rollers configured to be energized by the first load cam disc; and a torsion disc coupled to the torsion spring and operationally coupled to the first load cam disc, the torsion disc adapted to partially constrain the torsion spring, the torsion disc comprising: a disc having a first side, a second side, an outer periphery, and an inner bore; an annular recess formed on the first side of the disc; a plurality of splines formed on the inner bore; a first shoulder formed on the disc and configured to support the first load cam disc; a second shoulder formed on the disc and configured to support the torsion spring, and wherein the second shoulder rises from the first shoulder away from the first side reaching a maximum height measured from the first side, wherein the second shoulder rises from the first shoulder and then falls toward the inner bore.