Toric race transmission units

Claim 1

A TRANSMISSION UNIT OF THE TYPE IN WHICH ROLLERS PROVIDE A DRIVING CONNECTION BETWEEN FACING TOROIDAL SURFACES OF TWO DISCS MOUNTED FOR ROTATION ABOUT A COMMON MAIN AXIS, NAMELY AN INPUT DISC AND AN OUTPUT DISC AND IN WHICH THE ROLLERS ARE MOUNTED WITH FREEDOM OF MOVEMENT OF A FIRST CHARACTER PERMITTING THE DIAMETERS OF THE DISCS, WITH WHICH THE ROLLERS MAKE DRIVING CONTACT, TO BE VARIED SO AS TO VARY THE TRANSMISSION RATIO OF THE TRANSMISSION UNIT AND WITH FREEDOM OF MOTION ALSO OF A SECOND CHARACTER WHEREBY THE ROTATIONAL AXES OF THE ROLLERS DEPART FROM THE STABLE EQUILIBRIUM ATTITUDE WHERE THE SAID ROLLER AXES INTERSECT THE MAIN AXIS, SO THAT THE ROLLERS STEER THEMSELVES FROM ONE RATIO ATTITUDE TO ANOTHER RATIO ATTITUDE AND WITH VISCOUS DAMPING MEANS COMPRISING A FIRST ELEMENT COUPLED TO ONE ROLLER AND A SECOND ELEMENT COUPLED TO ANOTHER ROLLER, THE FIRST ELEMENT AND THE SECOND ELEMENT COOPERATING TO DEFINE BOUNDARIES OF A FLUID FILLED SPACE AND TO CHANGE THE VOLUME OF THAT SPACE WHEN THE ROLLER COUPLED TO THE FIRST ELEMENT EXECUTES A MOTION OF THE SECOND CHARACTER IN THE ABSENCE OF A MOTION OF THE SECOND CHARACTER, IN THE SAME SENCE AND TO THE SAME DEGREE, ON THE PART OF THE ROLLER COUPLED TO THE SECOND ELEMENT BUT TO LEAVE THE VOLUME OF THE FLUID-FILLED SPACE UNALTERED WHEN BOTH OF THE SAID ROLLERS EXECUTE MOTIONS OF THE SECOND CHARACTER WHICH ARE THE SAME IN SENSE AND DEGREE, THE FLUID-FILLED SPACE BEING PROVIDED WITH A RESTRICTOR ORIFICE THROUGH WHICH FLUID IS FORCED AT LEAST WHEN THE FLUID-FILLED SPACE IS REDUCED IN VOLUME.