Rotary piston type compound internal combustion engines

Claim 1

A ROTARY PISTON TYPE COMPOUND INTERNAL COMBUSTION ENGINE COMPRISING A PAIR OF JUXTAPOSED ROTARY PISTON UNITS HAVING A COMMON ROTARY SHAFT AND EACH INCLUDING A CASING HAVING A MULTI-LOBE EPITROCHOIDAL INNER PERIPHERAL SURFACE, SAID ROTARY SHAFT BEING JOURNALED IN SAID CASING, AND A ROTOR MOUNTED ON SAID ROTARY SHAFT ECCENTRICALLY WITH RESPECT THERETO AND ROTATABLE AT A PREDETERMINED RATIO RELATIVE TO SAID SHAFT, SAID ROTOR BEING SUBSTANTIALLY POLYGONAL HAVING EDGES COOPERATING WITH SAID INNER PERIPHERY OF SAID CASING, IT BEING ARRANGED SO THAT ONE OF SAID ROTARY PISTON UNITS OPERATES AS AN INTERNAL COMBUSTION ENGINE SIMULTANEOUSLY WHILE THE OTHER ROTARY PISTON UNIT OPERATES AS A COMPRESSOR, AND THEN SAID ONE ROTARY PISTON UNIT OPERATES AS THE COMPRESSOR FOR SAID OTHER UNIT SIMULTANEOUSLY WHILE SAID OTHER UNIT OPERATES AS AN INTERNAL COMBUSTION ENGINE THE COMPRESSED AIR EXIT PORT OF THE SECOND UNIT BEING IN COMMUNICATION WITH THE INLET PORT OF THE FIRST UNIT, THE EXHAUST GAS FROM THE FIRST UNIT BEING INTRODUCED INTO THE WORKING CHAMBERS OF THE SECOND UNIT TO EXPAND THEREIN FOR THE PURPOSE OF INCREASING THE TORQUE OF THE ENGINE.