Patent ID: 6868822

Claim:
An engine comprising a shaft driver located in a stator cavity of the engine and surrounded by expansion chambers defined between a wall of the shaft driver and the wall of the stator cavity, characterized in that, said shaft driver is a hollow cylinder, and said expansion chambers are separated by movable dividers mounted in said stator and bearing on said shaft driver, an output shaft is rotatably supported in said stator passes centrally through said stator cavity and through said shaft driver and said output shaft has bearing means to one side of said output shaft which bear on the inside surface of said shaft driver, said shaft driver bearing on said stator wall at a circumferential point extending along the length of the cylindrical wall of the shaft driver and said circumferential point moves around the wall of said stator during said orbital and rotational movement, whereby one revolution of said circumferential point around said stator wall is equivalent to one revolution of said output shaft, and during said one revolution of said shaft driver rotates about its own axis only a small fraction of a revolution, and whereby a combination of orbital and rotational movement of said shaft driver causes rotation of said output shaft at a rotational speed much greater than the rotational speed of said shaft driver.