Abstract: A two stroke cycle internal combustion engine (10) is provided which has a one-piece cylinder housing (14) removably secured to a valve drive housing (12) at a top section thereof and a crank housing (16) at a bottom section. The overall combination of the valve drive housing (12), the cylinder housing (14) and the crank housing (16) are formed in a substantially symmetrical manner about a vertical axis line (18). An intake valve member (30) is positioned in a top section of cylinder housing (14) with an exhaust port (62) located at the bottom of a piston (44) travel within a combustion chamber (54). The valve member (30) opens on a downward stroke of the piston (44) which feeds compressed air into chamber (54) and forces spent gases through the exhaust port (62).

Abstract: The present invention relates to a two-stroke engine comprising at least:a cylinder (111) in which a piston (112) moves and one end of which communicates with a pump crankcase (115) crossed through by the crankshaft (114) of the engine,a capacity under pressure (87) opening at one end into the combustion chamber (113) of the cylinder (111), at least one valve (86) ensuring an intermittent sealing between the chamber (113) and the capacity (87),a means (88) intended for carburetting the gas passing in said capacity (87),a means for controlling the opening of said valve (86) comprising a supple membrane (89) separating two chambers (95a, 95b) and connected to the rod of the valve.The engine according to the invention further comprises a liking means (92) between one (95b) of said chambers and the pump crankcase (115) of said cylinder, allowing notably the opening of the valve (86) to be activated as soon as possible when the pressure P.sub.B in the chamber (95b) becomes lower than the pressure P.sub.

Abstract: A two-cycle internal combustion engine comprises a cylinder with a piston, the cylinder having a port in which an intake valve is placed for feeding a fuel-air mixture from an intake manifold into an intake chamber. The intake chamber is positioned under the position, is isolated from a crank chamber and communicates with a combustion chamber. The combustion chamber is positioned above the piston and communicates with the intake chamber by means of a by-pass manifold, at the inlet of which an intake valve is placed for feeding a fuel-air mixture. An additional piston is provided which is positioned in the cylinder between the crank chamber and the main piston and is rigidly connected to the main piston. A second intake chamber is positioned between the first intake chamber and the additional piston. The second intake chamber isolated from the first intake chamber by means of a partition and communicates with the intake manifold and with the by-pass manifold.

Abstract: The present invention is an air-blast fuel injection two-stroke engine comprising at least one cylinder (1) in which moves a piston (2) defining a combustion chamber (14) and a pump crankcase (5) forming a continuation of the combustion chamber and separated therefrom by the piston (2), at least one main air inlet (7) in the pump crankcase that can be equipped with a first nonreturn device (6), a device for introducing the fuel mixture at a given pressure, comprising a mechanism (20) for opening and for closing a port (12) for introducing the fuel mixture into the combustion chamber (14), a container (15) connected to the introduction port (12) and containing the fuel mixture under pressure. The engine further comprises a mechanism (30-34) for sucking and introducing the fuel mixture under pressure into the container.

Abstract: The present invention relates to a two-stroke engine comprising at least a cylinder (111) in which a piston (112) moves and one end of which communicates with a pump sump (115) crossed by the crankshaft (114) of the engine, a capacity under pressure (87) opening at one end into said pump sump, at the other end into the combustion chamber (113) of cylinder (111), a valve (86) providing an intermittent seal between chamber (113) and capacity (87), a means (88) for carburetting the gases passing through said capacity (87), a means (82) for controlling the motion of said valve (86), comprising a supple membrane (89) separating a first chamber (95a) and a second chamber (95b), said membrane being connected to the valve rod. According to the invention, said engine further comprises a first means (92) for connecting the second chamber (95b) to the cylinder, the means being intended to retard the opening of said valve (86) by controlling the pressure in said chamber (95b).

Abstract: A valve arrangement in an internal combustion engine, into which engine the air-fuel mixture is directly injected by relative pumping elements from a pressure chamber towards at least one cylinder provided with a valve aperture with its relative valve located within a valve body provided with at least one communication channel, between the valve and the valve aperture there being positioned an elastic element which when at rest maintains the valve in its closed position, the valve being inserted into said valve body by way of interposed elements, lockable in their selected position, for adjusting both the preload and its travel.

Abstract: The present invention provides a crankcase compression type two-cycle engine which has a comparatively simple construction, is capable of operating at a low fuel consumption and discharges an exhaust gas having a comparatively low hydrocarbon concentration. The engine comprises a crankcase, a piston, a cylinder joined to the crankcase and provided in its lower part with an exhaust port which is opened and closed by the piston, a cylinder head attached to the upper end of the cylinder, and forming a combustion chamber together with the cylinder and the piston. A poppet scavenging valve is provided in the upper part of the cylinder so as to be opened to the combustion chamber side. A diaphragm actuator operates the poppet scavenging valve using the pressure within the crankcase. The diaphragm actuator is provided with a diaphragm that receives the pressure within the crankcase on one side thereof and receives the pressure of a spring on the other side thereof.

Abstract: A two cycle piston engine is described in which one or more intake poppet valves are carried in the top of the piston which driven onto a respective mating valve seat in the cylinder head by piston movement towards top dead center, a spring allowing retraction of the valve into the piston top after the poppet valve seats on its valve seat. A two valve arrangement opens one valve before the other, with air only in flowing through the first valve seat prior to opening of the other valve seat, through which fuel is injected.

Abstract: The internal combustion engine includes a working cylinder, a compressed air supply, an injector for supplying a gas and fuel mixture, an exhaust valve and an inlet valve. The inlet valve delivers both gas under pressure and gas and fuel mixture to the working cylinder, commencing delivery of the gas under pressure at an earlier stage in the engine cycle to the commencement of delivery of gas and fuel mixture. The inlet valve delivers gas under pressure to the cylinder at least for a part of the time that the exhaust port is open so as to drive combusted gases out of the working cylinder. The internal combustion engine also includes a rotary valve having a first member of a cylindrical external configuration, a sleeve surrounding the first member, and a mechanism for rotating the sleeve relative to the first member. The first member comprises a plurality of fluid passages and a plurality of apertures allowing communication of each of the passages with the exterior of the first member.

Abstract: A device for controlling a pneumatic injection of a carbureted mixture into a combustion chamber of a two stroke internal combustion engine, with the device including a compressed gas supply pipe adapted to be communicated with the combustion chamber of a cylinder by an intermittent sealing element, and a fuel metering device opening into the compressed gas supply pipe. A selective sealing element is arranged in the compressed gas supply pipe upstream from the intermittent sealing element and from the fuel injection device for controlling all carbureted mixture conveyed into the compressed gas supply pipe and used for pneumatic injection according to operating conditions of the internal combustion engine.

Abstract: The invention relates to a gas-exchanging process for two-stroke internal combustion engines, and a two-stroke internal combustion engine for executing the process, in which two scavenging paths of the gas are provided, namely the known reverse scavenging as the first scavenging path, and a second supply of combustion air effected by precompression serving as the second scavenging path, wherein during the second scavenging an ignitable fuel-air mixture forms in the area of the point of ignition and, by means of the differential pressure established at the intake valve, controls the mixture as well as the quantity itself.

Abstract: The invention relates to new and useful improvements in the exhaust and induction processes of the piston driven internal combustion engine. In the invention a gas ejector is used in conjunction with a poppet valve to control the induction of air and the discharge of combustion gases through a common duct within the engine cylinder head. The common duct is brought into communication with the clearance volume above the engine piston by rotation of the engine camshaft which is made equal to the rotation of the engine crankshaft, such that the poppet valve is operated at twice the cycle frequency required for four-stroke operation in the conventional engine. By operating the valve at this cycle frequency, and by the employment of gas ejector systems at the cylinder head above the poppet valve, and at another position on the engine cylinder near the bottom dead center of the engine piston travel, the engine is able to function interchangeably as a four-stroke or as a two-stroke system while running.

Abstract: A device, and method for introducing a carburetted mixture under pressure into a chamber of a first cylinder of a two stroke-internal combustion engine. The device includes a feed valve cooperating with a seat for closing a duct feeding carburetted mixture into the chamber of a first cylinder, a valve returning arrangement and an assistance member comprising a separation element cooperating with one end of a stem of the valve. The assistance member separates a first volume and a second volume within each of which a pressure prevails, with the separation element having a movement and causing displacement of the valve under the action of the pressure difference between the pressure of the first volume and the pressure of the second volume.

Abstract: A two-cycle engine has an air inlet in the crankcase, and a spiral air-fuel passage encircling the cylinder wall rising from the crankcase to an inlet in the cylinder head to effect cooling of the cylinder. A fuel injection device introduces fuel into the transfer passage. A unidirectional valve admits air and fuel into the cylinder head and curved fins impart a swirling action to the air and fuel to effect a fuel and air stratification. An exhaust passage in the cylinder wall has an adjustable throttle to control dirctly the outflow of exhaust gases and indirectly the inflow of fresh fuel-air mixture, whereby the power level of the engine is controlled.

Abstract: An internal combustion 2-stroke engine having at least one combustion chamber equipped with a delayed fuel supply system opening into a cylinder head. A wall of the cylinder has at least one exhaust port situated in the vicinity of a first referernce point through which passes a first axial plane of the cylinder or exhaust plane and at least one intake port situated in the vicinity of a second reference point, or intake reference point. A plane perpendicular to the exhaust plane and containing the axis of the cylinder defines two accommodation zones in the cylinder with the first accommodation zone, complementary to the second one, containing the reference point of the exhaust port, and the supply system is situated in the second accommodation zone.

Abstract: The combustion engine of this invention is basically a two stroke engine at which each revolution of the crankshaft is subjected to a power stroke in each of the cylinders. However, this engine is chargable with turbo- or loader-pressure to increase its power considerably. For this purpose the engine has exhaust slots with an exhaust collection chamber on one end of the cylinders and the head cover on the other end of the respective cylinder. Each head cover is provided with at least one independent first inlet valve and a second independent inlet valve, while the passages to the inlet valves are completely separated from each other. Through the first inlet valve a flashing flow is passed to clean the cylinder from exhaust gases, while after closing of the first inlet valve, the second inlet valve is opened to pass a pre-compressed or loaded flow into the cylinder at a time when the exhaust slots are already closed.

Abstract: A reciprocating combustion engine is improved by a cycle which applies outlet slots at the bottom of the cylinders, through which the exhaust gases exit to pass into a charger drive unit, while the charger drive unit drives a charger which delivers air or mixture over inlet valve means into the cylinder. The charging is also used to drive the exhaust gases out of the cylinder. Four cycle engines can thereby made up to two-stroke engines with super-charging. Outlet valves and heat on them as in typical four-stroke engines are spared. Flow areas into and out of the cylinder are increased and so is the power of the engine. A charger-arrangement provides a plurality of flow streams to super-charge the cylinders, to cool the valve head and to cool the valves. The head of the piston has a configuration relative to the valve head for preventing dead space and respective losses.

Abstract: A two stroke internal combustion engine with piston and cylinder has a crankshaft having peripheral gears and a cam both affixed to the same crankshaft throw. A trough is in the engine crankcase whereby the gears pass through lubrication.

Abstract: A two-stroke engine includes an intake-and-scavenge valve in the cylinder head together with a fuel injection system, a recirculating type pressure lubricating system, and a blower or turbo charger assisting in charging the cylinder with air and also assisting in scavenging the exhaust gases . The piston head is domed with one side curving downwardly towards the exhaust port formed through the wall of the cylinder above the bottom dead center position of the piston head. The exhaust port slopes outwardly and downwardly following generally the slope of the piston to facilitate the flow of exhaust gases therethrough assisted by the scavenging air entering through the inlet-and-scavenger valve. The valve is operated by a cam mounted on a cam shaft upon the cylinder head which in turn is operatively connected to the crankshaft. The width of the cam lobe is such that the opening, closing and duration of opening of the valve is controlled with the valve being opened approximately 140.degree.

Abstract: An automatic impact delivering device or tool of the internal combustion type having a self-contained fuel supply, wherein:1. valving is an integral function of the piston;2. a pre-compression chamber and a combustion chamber are provided in the same structure;3. there is only one major moving part;4. a spark plug is fired by an ignition means, the ignition means being movable to enable the operator to change the power output of the device by changing the compression ratio of the fuel and air mixture in the combustion chamber;5. a fuel metering system is an integral part of the piston and cylinder, thus not requiring any additional moving parts; and6. the device is loaded by a single spring disposed wholly internally thereof.

Abstract: Disclosed are intake and exhaust assemblies for forced air intake, reciprocating piston, internal combustion engine. Alternate embodiments of the air intake valve assembly include a hollow tube defining the intake port with means operatively coupling the tube and piston to respectively open and close the intake port in response to the reciprocation of the piston. The exhaust valve assembly includes operatively interrelated valve stem, spring retainer, rocker arm, and camming assemblies for alternatingly opening and closing the exhaust port for predetermined time intervals.

Abstract: The invention provides a two-stroke-cycle engine which has a main piston, and an auxiliary piston and transfer valve arrangement. and its associated drive mechanism. The engine has also at least two intake valves arranged in the cylinder head. The auxiliary piston and transfer valve assembly comprises an auxiliary piston having an external hollow stem linearly slidable in a bushing mounted in said cylinder head and the transfer valve is provided with a stem freely slidable within said hollow stem.

Abstract: The two-stroke engine has a piston mounted in a cylinder having a full diameter bore throughout its major length and a reduced diameter upper bore portion. The piston has the same configuration and in its upward compression stroke, air and finely-divided water droplets are admitted into an annular space formed between the piston's reduced diameter and the cylinder's full diameter. Flow of the air water mixture through an exhaust valve cools the motor. At TDC (top dead center) the upper surfaces of the piston and the cylinder mutually form a relatively small spheroidal combustion chamber. Differing compression ratios in the annular and the spheroidal chamber cause the air-water mixture to rush into the spheroid in a swirling motion to intimately mix with injected fuel. Ignition produces a complete burning. End gases or the like are burnt in the cooler annular space to avoid detonation. The fuel injection is in measured increments determined by the temperature and pressure of the water mixture.

Abstract: An efficient, portable, easy to operate tool employing a linear motor is disclosed that is powered by the gases produced from the internal combustion of a fuel and air mixture. A supply of liquified gas stored under pressure in a cylinder provides the source of power. The linear motor is slidably mounted within a cylinder to move reciprocally downwardly and upwardly through a driving and return stroke. A combustion chamber is formed at the upper end of the cylinder. A spark plug powered by a piezo-electric firing device is located within the combustion chamber. The combustion chamber features a turbulence generator, such as a fan, driven by an electric motor which is continuously in operation when the tool is in use. A main valve mechanism actuated by a set of lifting rods that are moved upwardly and downwardly when the tool is moved towards and away from the workpiece, is used to control the opening and closing of the combustion chamber and to control the flow of fresh air through the combustion chamber.

Abstract: A two-stroke engine includes an intake-and-scavenge valve in the cylinder head together with a gasoline fuel injection system, a recirculating type constant pressure lubricating system, and a blower or turbo charger combination assisting in charging the cylinder with air and also assisting in scavenging the exhaust gases. The piston head is domed with one side curving downwardly towards the exhaust port formed through the wall of the cylinder above the bottom dead center position of the piston head. The exhaust port slopes outwardly and downwardly following generally the slope of the piston to facilitate the flow of exhaust gases therethrough assisted by the scavenging air entering through the inlet-and-scavenger valves. The valve is operated by a cam mounted on a camshaft upon the cylinder head which in turn is operatively connected to the crankshaft. The shape of the cam lobe is such that it controls the opening, closing and duration of opening of the valve with the valve being opened approximately 153.