Abstract: A four cycle internal combustion engine comprising a housing defining an internal compartment having one or more peripheral lobes, an inner body mounted in the housing for non-rotational orbital movement and having one or more peripheral lobes corresponding in number to the number of compartment lobes, and with each inner body lobe disposed within a corresponding compartment lobe for movement therein during at least a portion of the orbital movement of the inner body. The inner body is provided with one or more recesses corresponding in number to the inner body lobes and a movable wall member is mounted for movement in each inner body recess to define with the housing and inner body a fluid intake and compression chamber of the engine.

Abstract: An improved work machine of the eccentric piston type which may be employed to translate force of pressurized fluid into rotary shaft motion in an external combustion type engine system, as a pump for pumping fluids in a fluid handling system, and as a fluid actuated motor. The work machine comprises a housing having an internal compartment with a peripheral lobe. An inner body is mounted for non-rotational orbital movement in the housing. The inner body housing, and a movable wall member located in a peripheral recess of the inner body form variable-volume fluid intake and discharge chambers in the housing compartment during orbital movement of the inner body. Pressurized fluid supplied to the fluid intake chamber of the housing imparts non-rotational orbital movement of the inner body in the housing and corresponding rotational motion to an output shaft on which the inner body is eccentrically mounted.

Abstract: A four-cycle internal combustion engine comprises a housing defining an internal compartment having one or more peripheral lobes, an inner body mounted in the housing for non-rotational orbital movement and having a plurality of peripheral lobes corresponding in number to the number of compartment lobes, and with a peripheral recess in the inner body between inner body lobe. A movable wall member is mounted for movement in each inner body peripheral recess and defines with the housing and inner body, a variable-volume fluid intake and compression chamber. The inner body is mounted in the housing compartment so that each of its peripheral lobes moves in a circular orbit into a respective one of the compartment lobes during movement of the inner body, and the inner body lobe, housing, and movable wall member define a variable-volume power chamber and exhaust chamber in each of the compartment lobes during movement of the inner body.