Continuously variable ratio transmission

A continuously variable ratio transmission of the rolling friction type having a plurality of tiltable rollers and a hydraulic circuit for controlling the tilt angle of said rollers, said control circuit comprising:

• a source of pressurized fluid;
• means operable by fluid pressure for providing a force to balance roller torque reaction;
• hydraulic end stop means associated with said roller torque reaction balancing means, whereby to limit the tilt angle of said rollers;
• end loading means located upstream of said end stop means for providing a reaction force between the rolling components;
• and
• means for attenuating peak pressures in the fluid upstream of said end stop means.

A continuously variable ratio transmission of the rolling friction type, having a plurality of tiltable rollers and a hydraulic control circuit including:

• a source of pressurized fluid;
• means operable by fluid pressure for producing a force to balance roller torque reaction;
• valve means for controlling fluid flow to said roller torque reaction balancing means;
• and
• emergency override means for overriding electrical control of said valve means and for effecting operation of said valve means by fluid pressure from said source.