Normal friction force developing system for traction drive transmissions

In a biconical torque transmitting body having a pair of oppositely convergent, generally conical traction surfaces of revolution about one axis inclined with respect to and intersecting another axis coaxial with another pair of axially spaced traction surfaces against which said conical traction surfaces are retained under normal force loading for the transmission of torque by rolling friction between said respective pairs of rolling surfaces, such normal force loading being variable in accordance with torque loading on the biconical body and developed by force application acting to separate a pair of cone members carrying said conical surfaces along said one axis, the improvement comprising:

• a torque member coaxial with and supported by the biconical body with freedom for rotatable and axial movement relative thereto:
• ramp means operative between said torque member and said cone members to develop an axial thrusting force between said cone members;
• and
• means for preventing relative rotation of said cone members while permitting axial separation thereof.