Abstract: An internal combustion engine comprises a hollow rotary engine body, an axially opposite pair of main pistons capable of rotating with but slidably reciprocating relative to the engine body, a cam mechanism for causing the main pistons to make one full rotation with the engine body as the piston makes two reciprocations, and a pair of axially fixed auxiliary pistons coaxially inserted into the respective main pistons. A main combustion chamber is formed in the engine body between the main pistons, whereas a pair of auxiliary combustion chambers are formed in the respective auxiliary pistons. Explosive combustion takes place alternately in the main combustion chamber and each auxiliary combustion chamber.

Abstract: An internal combustion engine has a crankcase and a cylinder with an outlet with a first flange. A muffler having an inlet with a second flange is connected to the outlet with the inlet. The muffler is formed as a unitary part. The first flange has a first flange surface and the second flange has a second flange surface, whereby the first flange surface and the second flange surface contact one another so as to form a flange connection. At least two slip-on clamps are connected to a circumference of the flange connection. The clamp has substantially the shape of a bracket with two legs extending in the same direction. The legs have inner surfaces facing one another. The flange connection has receiving surfaces for the legs wherein the inner surfaces of the legs cooperate with the receiving surfaces so as to force the first and the second flange surfaces against one another.

Abstract: The present invention provides an internal combustion engine comprising a hollow engine body rotatable about a fixed shaft, a pair of pistons capable of rotating with but slidably reciprocating relative to the engine body, and a cam mechanism for causing each piston to make one full rotation with the engine body as the piston makes two reciprocations. A combustion chamber is formed in the engine body between the pair of pistons, whereas a pair of air supply chambers are arranged on the side of the respective pistons axially away from the combustion chamber. Each air supply chamber is highly compressed when the pistons are moved away from each other, and the resulting compressed air is utilized for scavenging, internally cooling and supercharging the combustion chamber.

Abstract: A power plant has an internal combustion engine with piston backside pumping and a stroke of sufficient length to reduce the pressure of the combustion gases at the end of the power stroke to substantially a common inlet and exhaust pressure, extracting maximum power from the combustion gas expansion and reducing both power loss from expansion into the exhaust manifold and exhaust noise. For a cylinder the exhaust valve is opened at a specific time relative to the engine cycle, but exhaust closing is variable to account for changes in operating conditions and power settings. In a preferred embodiment the engine is a two-cycle compression-firing engine, and an exhaust valve for a cylinder is opened by cam action but closed at a variable time by an actuator controlled by a computer.

Abstract: In a two-cycle engine lubrication system in which a crankshaft is supported on a pair of bearings in a crankcase, the crankshaft being sealed with seals mounted outwardly of the bearings and lubricating holes being provided along transfer passages which connect the crankcase with a combustion chamber and extending into the crankshaft bore between the bearings and the seals. The lubricating holes open into the crankshaft bore close to the bearing and one or more lubricant guide grooves extend outwardly in the crankshaft bore from the lubricating holes to a seal.

Abstract: A crankchamber precompression type two-cycle internal combustion engine including cylinder assemblies of an even number consists of at least one pair of cylinder assemblies having working cycles with 180.degree. phase difference, each cylinder assembly having a stepped cylinder constituted by a minor diameter cylinder portion and a major diameter cylinder portion, a stepped piston received in the stepped cylinder and constituted by a minor diameter piston portion and a major diameter piston portion, the minor diameter and major diameter piston portions being in sliding engagement with the minor diameter and the major diameter cylinder portions of the stepped cylinder respectively to provide an annular space serving as sub-intake chamber in the major diameter portions of the cylinders, the sub-intake chambers being connected to an auxiliary scavenging nozzle oriented toward a combustion chamber of the other associated cylinder.

Abstract: The invention relates to a method and an apparatus for reducing to a minimum the predominant full load noise of port-controlled, two-stroke internal combustion engines by constructing the lower suction port boundary and the lower piston boundary, so that there is a gradual port opening during the upward movement of the piston and a gradual port closing during its downward stroke.

Abstract: An engine comprising one pair of scavenge ports alternately covered and uncovered by a piston, a richer air-fuel mixture and a leaner air-fuel mixture being separately fed into the cylinder from the scavenge ports, the richer air-fuel mixture flowing into the cylinder towards the inner wall thereof, located opposite the exhaust port, and the leaner air-fuel mixture flowing into the cylinder so that it overlays the richer air-fuel mixture.

Abstract: A two-stroke engine is provided comprising at least one cylinder (1) in which is slidingly mounted a piston (2) which defines in this cylinder a combustion chamber (C) and a precompression chamber (P), the lateral cylindrical wall of the cylinder being provided with at least two ports closable by the piston (2), namely at least one transfer port (3) through which opens a transfer channel (4) connecting the two chambers together and at least one exhaust port (5) communicating with an exhaust pipe (6). These two ports are arranged and disposed so that the opening of the transfer port (3) begins before that of the exhaust port (5) and special means are provided for making the pressure of the fresh gases admitted into the combustion chamber (C) through the transfer port (3), during opening of this transfer port, sufficiently high with respect to that of the burnt gases then present in the combustion chamber.

Abstract: A fuel distribution system for an engine (10) having the fuel nozzles (74) located downstream from the air intake reed valves (52) to prevent the operation of the reed valves (52) from effecting the dual flow to the combustion chambers (42) through the transfer tubes (26). A manually operated pump (106) responds to an operator input to add or subtract fuel supplied to a flow divider (98) by a fuel valve (104) to provide a substantially immediate response from the engine to the operator input. A choke (160) receives an input from the engine to allow the mass air flow responsive fuel valve (104) to supply the flow divider (98) with an additional quantity of fuel during a starting operation.

Abstract: In a two-stroke internal combustion piston engine, a piston is reciprocally movable within an axially elongated cylinder. The piston has a bottom dead center position and in the region of this position, the cylinder has an exhaust opening and a number of pairs of scavenging openings. An axially extending plane within the cylinder divides the exhaust opening in half and in each pair the scavenging openings are arranged symmetrically on opposite sides of the axially extending plane. Each pair of scavenging openings is located at a different distance from the exhaust opening. The projection of the side surfaces of the pairs of scavenging openings extending in the axial direction of the cylinder each form a different angle at the point of intersection of the projections and the point of intersection is directed away from the exhaust opening.

Abstract: A two cycle engine has a cylinder, a piston axially slidably mounted in said cylinder, and through the wall of the cylinder an intake port, exhaust port, and scavenging port. These ports are respectively connected to intake, exhaust, and scavenging passages. An auxiliary intake passage opens through the cylinder wall, circumferentially spaced from the other intake passage so as to leave an axially-extending side-support surface to permit of an enlarged total intake port area without permitting the piston to tilt or otherwise wander from its true path, thereby to reduce piston clatter and wear, and to improve engine performance.

Abstract: An I.C. engine has a block, the engine forming a bore and having a crankshaft. The engine includes:(a) first and second pistons that reciprocate in that bore,(b) connection structure interconnecting the pistons, the pistons operatively connected to the crankshaft,(c) valve casing structure operatively coupled to the block, there being a first zone in the bore between the casing structure and one piston, and a second zone between the casing structure and the other piston,(d) the valves associating with the casing structure adapted to pass intake air into one of such zones and to exhaust compressed air out of the other of the zones in response to piston movement in one direction, and adapted to pass intake air into the other of the zones and to exhaust compressed air from that one zone in response to piston movement in the opposite direction.

Abstract: An in-line, multi-cylinder, two-cycle loop charged engine 10 has transfer passages 21, 22, and 23 partially formed by cavities die-cast in the cylinder block 14. The transfer passages are completed by covers, 24 and 25 bolted to the block 14. An efficient loop charging system is thus provided in a completely die-cast cylinder block.

Abstract: A regenerative heat engine designed to produce power for the operation of equipment such as an artificial heart is disclosed. The heat engine includes a temperature control heat pipe located around the periphery of the engine cylinder and a temperature distribution heat pipe located around the periphery of the heat source. A flywheel and bellows seal is included as part of the displacer piston drive, and a flexure support is positioned on the hot end of the displacer piston to allow the piston to move longitudinally while restricting lateral motion.