Assemblies and methods for clamping force generation

A method of controlling an axial force in a continuously variable transmission (CVT) having a plurality of spherical power rollers in contact with a first traction ring, a second traction ring, and a support member, the method comprising the steps of:

• providing a mechanical load cam coupled to the first and second traction rings;
• configuring the mechanical load cam to provide an axial force between the power rollers and the support member, and between the power rollers and the first and second traction rings, the axial force based at least in part on an operating condition of the CVT;
• and
• coupling a permanent magnet bearing to the first traction ring, the permanent magnet bearing adapted to provide a predetermined clamp force between the spherical power rollers, the first and second traction rings, and the support member.

A continuously variable transmission (CVT) having a plurality of spherical power rollers in contact with a support member at a radially inward location, a first traction ring, and a second traction ring, the CVT comprising:

• a first mechanical load cam operably coupled to the first traction ring;
• a torque coupling coupled to the second traction ring;
• a second mechanical load cam coupled to the torque coupling;
• a permanent magnet bearing coupled to the first and second mechanical load cams, the permanent magnet bearing adapted to provide a predetermined clamp force between the spherical power rollers, the first and second traction rings, and the support member.