Fluid drive power transmission

Claim 1

A HYDRAULIC MOTOR COMPRISING A STATIONARY HOUSING, A CYLINDRICAL ROTOR CHAMBER WITHIN SAID HOUSING, A SHAFT MOUNTED FOR ROTATION ECCENTRICALLY OF SAID CHAMBER AND EXTENDING FROM AT LEAST ONE END OF THE HOUSING, A VANE TYPE ROTOR FASTENED TO SAID SHAFT CONCENTRICALLY THEREWITH WITHIN SAID ROTOR CHAMBER, AN INLET FOR HYDRAULIC FLUID TO AND AN OUTLET FOR HYDRAULIC FLUID FROM SAID ROTOR CHAMBER FOR CONNECTING IT TO A HYDRAULIC FLUID CIRCULATING SYSTEM, AT LEAST ONE GROOVE IN THE INNER SURFACE OF THE ROTOR CHAMBER EXTENDING ALONG THE FREE SPACE BETWEEN SAID ROTOR AND THE PERIPHERY OF THE ROTOR CHAMBER, A REGULATING PIECE SLIDABLY RECEIVED IN SAID GROOVE AND SPANNING THE DISTANCE BETWEEN AT LEAST TWO ADJACENT ROTOR VANES WHILE LEAVING A MAJOR PORTION OF THE LENGTH OF THE GROOVE UNOBSTRUCTED, AND MEANS FOR SHIFTING THE POSITION OF SAID REGULATING PIECE IN SAID GROOVE FOR REGULATING THE SPEED AND TORQUE OF THE POWER OUTPUT FROM SAID SHAFT WHEN A CONSTANT RATE FLUID FLOW IS CIRCULATED THROUGH SAID INLET AND OUTLET.