Abstract: A valve is provided for a piston of a two stroke engine wherein the piston has a sidewall and top and bottom surfaces with the top surface having a first opening therein and a second opening extending between the top and bottom surfaces for receiving the valve, and wherein the piston has a plurality of pressure relief openings extending between the top and bottom surfaces. The valve comprises a valve plate positioned in the opening in the top surface overlaying the pressure relief openings with the valve plate having a central opening extending parallel to the sidewall. The valve plate is movable from a seated position covering the pressure relief openings to an unseated position exposing the pressure relief openings when pressure inside the piston exceeds a predetermined value.

Abstract: A two-stroke cycle internal combustion engine including a crankshaft, a connecting rod pivotally connected to the crankshaft, a fuel induction system and spark plug or the like. The cylinder has a closed head end and a closed rearward end and a piston within the cylinder defines a combustion chamber as well as a charging chamber. A plurality of radial inlet ports formed in the cylinder wall is normally closed by the piston but is opened to the charging chamber when the piston passes through its top dead center position. A plurality of radial exhaust ports also is formed in the cylinder wall and is normally closed by the piston but opened to the combustion chamber as the piston passes through its bottom dead center position. An axial valve port is formed in the crown of the piston to communicate between the charging chamber and the combustion chamber. An operating rod mounted in the cylinder has a valve head formed on its inner end to close the valve port.

Abstract: Process and device for supplying air to the cylinder of a two-stroke internal combustion engine, with at least one set of two cylinders arranged at 180 degrees, supercharged by a post-filling effect. Said device is characterized in that it comprises a volumetric pimp defined by the natural movement of a piston between its top dead center and its bottom dead center and inversely, connected to intake air transit means (8A, 8B) for the air supply thereto. Advantageously the volumetric pump is formed by the pump casing of the cylinder which is in the scavenging phase. In a variant, this device comprises at least one transfer passage (30) intermittently connecting the transit means (8A, 8B) with the upstream pump casing (6B, or 6A) associated therewith. The device of the invention provides, at all times, the required aie supply and hence correct operation of the engine even at low loads or during start-up, and in an easy manner.

Abstract: A device (4, 5) for introducing, under pressure, a fuel-air mixture into a first cylinder of an internal combustion engine, with the engine comprising at least one other cylinder having a pump crankcase. A connecting passageway (9) is provided between the pump crankcase (12) and the upper part of first cylinder (1), with the passageway being supplied with fuel. A communication between the passageway and the combustion chamber of the first cylinder is blocked, and a non-zero angular offset exists between the cycles of the cylinders. The device (4, 5) controls the start of injection by interrupting, in an intermittent and predetermined fashion, the communication between the passageway (9) and the pump crankcase.

Abstract: An opposed piston two cycle internal combustion engine. The movement of the opposed pistons is transmitted to two cranks, the two cranks are interlocked together by gears. The gears maintain synchronized movement of the cranks and further act as an air pump to force air intothe intake manifold 20. A fuel charge is admitted into the intake tube 19 and is controlled by the rotary valve 17 for admission into a pre-compression crankcase 3. The rotary valve allows for further communication between the precompression crankcase 3 and injection crankcase 2 via passage 22. Air is introduced into the combustion space 10 via inlet ports 14. A fuel/air mixture is further controllably introduced via a fuel injection port 13 in the injection piston 4. The exhaust ports 15 are opened prior the timing of the intake ports 14 and close prior the closing of the intake ports 14 for superior scavenging.

Abstract: An internal combustion engine is described in which the piston movement is parallel to the drive shaft. The engine cylinders are arranged in opposed pairs and the piston rods directly coupled so that the power stroke in one cylinder can assist with the compression stroke in the associated cylinder. The coupled or common piston rods have attached thereto a carriage that engages in a cam groove in the drive shaft. The drive shaft cam groove receives the force of the carriage as it is propelled by the pistons and the resulting torque causes a rotation of the drive shaft. The cylinders include a precompression chamber that assists in the exchange of combustion products with air. The internal combustion engine does not require special cooling and does not require a starter motor.

Abstract: A lightweight crankless piston engine utilizes cam action to produce two piston strokes for one revolution of the engine output shaft, which shaft does not pierce the piston or the combustion chamber. Ease of assembly is enabled. One section of the cam is embodied in the cylinder liner and the opposing cam section is an extension of the output shaft housing. In its simplest mode, the engine is ported for fuel-air induction and exhaust. Cam induced piston rotation directly drives the output shaft while piston reciprocation is allowed without influencing such shaft.

Abstract: A two-stoke cycle combustion-engine with crank-chamber compression is described, free of charging transfer passages external to the cylinder, with pumping-displacement exceeding working-displacement for responsive intake and thorough scavenging of spent-gas residue, and featuring an annular water-cooled cell, suspended from the cylinder-head by several water-conduits, and cooperating with an annular recess in the piston-head so as to form, and transversely separate, a plain working-chamber and an annular working-chamber, longitudinally scavengeable in series, bottom-to-top and top-to-bottom, respectively, with minimal loss of charge to exhaust-port, such a system of scavenging also reducing piston cooling-problems and misfiring associated with charge-dilution (in gasoline-engines operating under partial-charge conditions). In addition, a more general scavenging principle is enunciated and claimed, applicable to rear-compression and separately-scavenged two-stroke engines.

Abstract: An improved two-cycle internal combustion engine with a novel intake, exhaust and piston arrangement in which a fresh charge for combustion component is advantageously transferred through the piston and all valves in the engine operate in response to changes in dynamic pressure generated within the engine. The piston includes at least one charging passage through its top surface with a pressure sensitive valve affixed to the top surface of the piston for preventing flow of a fresh charge through the charging passage in the absence of a greater pressure differential caused by the intake charge against the undersurface of the pressure sensitive valve.

Abstract: An internal combustion engine having a piston assembly such that gaseous flow into a cylinder is through the piston assembly and wherein all gaseous flow in a cylinder is in a single direction. The piston assembly includes inner and outer piston members which are relatively movable so as to form a gaseous passage therethrough in certain conditions. The engine also features a special valve mounting arrangement and a special crankshaft construction.

Abstract: A reciprocating piston four cycle internal combustion engine utilizes a stepped piston the stepped portion of which, working in an enlarged bore in the block, serves as a compressor to provide a supercharged fuel-air mixture to the combustion chamber. The compressor delivers two compression strokes per engine cycle. The compressed fuel-air mixture travels from the compressor via a bypass manifold, which also serves as an accumulator, to the main cylinder via an intake valve. Fuel-air mixture is admitted to the compressor cylinder through the crankcase and valved passages through the stepped portion of the piston.

Abstract: An internal combustion engine having a housing defining a pair of axially aligned and opposing cylinders with a lubricant chamber therebetween, a stationary piston in the housing extending through the lubricant chamber and having opposite ends disposed within the aligned cylinders, and a hollow cylindrical piston slidably received within the housing and around the stationary piston for reciprocal movement thereby forming a pair of first variable volume chambers between it and the aligned cylinders and a pair of second variable volume chambers between it and the stationary piston. A carburetor communicates with the second chambers through longitudinal passageways in the stationary piston so as to admit a charge of combustible fuel therein which is compressed and then injected into the first chambers for recompression and subsequent combustion, the compression and combustion cycles for the chambers on opposite ends being 180.degree. out of phase.

Abstract: A gas cushioned free piston type engine comprises two oppositely arranged combustion cylinders and a pair of pistons reciprocably mounted therein, which are rigidly connected to each other by a common piston rod. The engine includes further a pump cylinder provided in a central part of the engine located between the two combustion cylinders, a pump piston having opposite faces impingeable by fluid, fixed to the piston rod and dividing the pump cylinder into a pair of pump cylinder chambers, a common suction chamber and a common pressure chamber, which, together with inlet valves and outlet valves, are arranged in the central part of the engine.

Abstract: An improved two-cycle internal combustion engine with a novel intake, exhaust and piston arrangement in which a fresh charge for combustion is advantageously transferred through the piston and all valves in the engine operate in response to changes in dynamic pressure generated within the engine. The piston includes at least one charging passage through its top surface with a pressure sensitive valve affixed to the top surface of the piston for preventing flow of a fresh charge through the charging passage in the absence of a greater pressure differential caused by the intake charge against the undersurface of the pressure sensitive valve.

Abstract: A four stroke cycle internal combustion engine is disclosed with means to provide auxillary pumping of air directly into the cylinder. The piston head is provided with a sliding valve which is self-acting for injecting air into the cylinder during the intake stroke, and to inject air into the cylinder during a portion of the expansion stroke. An air pumping chamber is formed between the lower portion of the piston and the cylinder carries a self-acting sliding valve which controls the flow of air into the pumping chamber.