V-belt transmission with variable transmission ratio

Claim 1

IN A V-BELT TRANSMISSION WITH VARIABLE TRANSMISSION RATIO, INCLUDING A PULLEY HAVING AN AXIALLY MOVABLE PULLEY CHEEK AND PROVIDED WITH A VARIABLE VOLUME CHAMBER ADAPTED TO RECEIVE A LIQUID UNDER PRESSURE, THE ACTUAL CHAMBER VOLUME AND THE ACTUAL AXIAL POSITION OF SAID MOVABLE CHEEK DEPENDING UPON ONE ANOTHER, AND MEANS INCLUDING A CONTROL VALVE AND A PIPE CONNECTION BETWEEN SAID CHAMBER AND SAID VALVE FOR FLUID SUPPLY AND ESCAPE TO AND FROM SAID CHAMBER, SAID MOVABLE PULLEY CHEEK BEING PROVIDED ON ONE SIDE WITH A COAXIALLY DISPOSED HUB, A DRIVING ROTATABLE SHAFT SLIDABLY EXTENDED THROUGH SAID HUB AND CHEEK AND SLIDABLY KEYED TO SAID HUB, SAID SHAFT PROJECTING FROM SAID HUB AND CHEEK ON ONE AND THE OTHER SIDE THEREOF, A SLEEVE EXTERNALLY FITTED ONTO SAID HUB AND DEFINING AN ANNULAR RECESS WITH SAID SHAFT END PROJECTING FROM THE HUB, SAID SLEEVE HAVING A TRANSVERSE BOTTOM SECURED TO SAID SHAFT END PROJECTING FROM THE HUB, WHEREBY SAID VARIABLE VOLUME CHAMBER IS CONSTITUTED BY THE ANNULAR RECESS PROVIDED BETWEEN SAID SHAFT, SAID SLEEVE, THE BOTTOM THEREOF AND THE END OF SAID HUB WITHIN SAID SLEEVE, AN EXTERNAL PIPE, AND AXIAL ROTARY JOINT CONNECTION THROUGH SAID BOTTOM BETWEEN SAID EXTERNAL PIPE AND SAID VARIABLE VOLUME CHAMBER, SAID CONTROL VALVE COMPRISING A CASING HAVING AN INNER CAVITY IN PERMANENT CONNECTION WITH SAID PIPE AND THERETHROUGH WITH SAID CHAMBER, A FLUID INLET, A FLUID OUTLET AND VALVE MEANS FOR SELECTIVELY CONNECTING SAID INLET AND OUTLET WITH SAID CAVITY, SAID VALVE MEANS COMPRISING A PILOT VALVE MEMBER AND A PILOT FOLLOWING VALVE MEMBER, AND MEANS OPERATIVELY CONNECTING SAID MOVABLE PULLEY CHEEK AND FOLLOWING VALVE MEMBER TOGETHER SO THAT THE ACTUAL POSITION OF THE LATTER DEPENDS UPON THE ACTUAL POSITION OF SAID MOVABLE PULLEY CHEEK.