Abstract: The invention contemplates electronically controlled fuel-injection for a multiple-cylinder two-cycle internal-combustion engine wherein each cylinder has its own independent crankcase region in which to receive and compress inlet air and fuel, prior to delivery of combustible mixture to the head or combustion end of the cylinder. Fuel is injected into each crankcase region during only a portion of the stroke involving induced intake of air therein, i.e., during only a portion of the rise of each piston in its approach to top-center position, and while pressure within the crankcase region is relatively uniform. The time-duration of actual injection is relatively short, thus enabling a plurality of different cylinder injections to be made concurrently, resulting in simplification of fuel-injection control circuitry.

Abstract: The invention contemplates electronically controlled fuel-injection for a single or multiple-cylinder two-cycle internal-combustion engine wherein each cylinder has its own independent crankcase region in which to receive and compress inlet air and fuel, prior to delivery of combustible mixture to the head or combustion end of the cylinder. Fuel is injected directly into each crankcase region during only a portion of the stroke involving induced intake of air therein, i.e., during only a portion of the rise of each piston in its approach to top-center position, and while pressure within the crankcase region is relatively uniform. The time-duration of actual injection is relatively short, to enable identical injections in each cylinder, each such injection being identically timed with relation to position and displacement of its associated piston.

Abstract: A two-stroke cycle gasoline engine including at least one two-stroke cycle power cylinder-piston assembly adopting uniflow scavenging and incorporating two horizontally opposed pistons, and at least one scavenging pump cylinder-piston assembly of the reciprocating type with or without having crankcase compression, wherein the total stroke volume of the scavenging pump means is 1.35 to 1.85 times as large as that of the power cylinder-piston assembly, and the operational phase of the pump cylinder-piston assembly is shifted from that of the power cylinder-piston assembly by an angle of 180.degree. or a little more.

Abstract: A two-cycle engine of the crank chamber preloading type of the construction in which a crankcase, a cylinder head and a cylinder are clamped together by a plurality of clamping members penetrating the cylinder includes a suction port formed in a wall of the cylinder, an exhaust port formed on a side of the cylinder opposite the suction port, at least one main scavenging port disposed between the suction port and the exhaust port and directed toward the suction port, and at least one ancillary scavenging port disposed above the suction port and juxtaposed against the exhaust port. At least one ancillary scavenging passage branching from at least one main scavenging passage and communicating with the ancillary scavenging port extends around an opening for one of clamping members on the suction side.

Abstract: An internal combustion engine comprises a combustion chamber and a crankcase which extends from the combustion chamber. A primary fuel delivery system introduces fuel from a fuel source into the combustion chamber, and a primer fuel delivery system is selectively operable for introducing fuel from the source into the combustion chamber in addition to fuel which is introduced by the primary fuel delivery system. A collector assembly communicates with the crankcase for accumulating residual fuel from the crankcase, and a residual fuel delivery system supplies fuel from the collector assembly into the combustion chamber. A control valve mechanism is connected to the primer fuel delivery system and the residual fuel delivery system for blocking the supply of fuel by the residual fuel delivery system during operation of the primer fuel delivery system.

Abstract: An engine comprises a combustion chamber and interior walls which define a fuel induction passage having a fuel outlet port communicating with the combustion chamber. A first fuel delivery system introduces fuel from a fuel source into the combustion chamber. A second fuel delivery system includes a nozzle which extends into the fuel induction passage adjacent to the fuel outlet port and is selectively operable by means of an associated valve mechanism for introducing fuel from the source directly into the combustion chamber through the nozzle in addition to the fuel which is introduced into the combustion chamber by the first fuel delivery system.

Abstract: A two-cycle internal combustion engine includes a power cylinder, a drive piston being positioned therein. A first transfer duct extends between an auxiliary cylinder, which is supplied with carburetted air and the power cylinder and opens thereinto via a carburetted air inlet port provided on the side wall of the power cylinder or its combustion chamber. A pump crankcase, which is supplied with pure air, is connected to the power cylinder via a second transfer duct which opens thereinto via a scavenging inlet port on the side wall of the power cylinder. An exhaust port is provided on the side wall of the power cylinder. The ports are operatively arranged so that the scavenging port starts to open after the exhaust port and before the carburetted air inlet port.

Abstract: The inlet manifold for a V-6, two-cycle outboard motor engine is arranged with one inlet passage for each cylinder. The inlet passages form a V with each passage substantially in line with the cylinder it feeds, but sloping downward.

Abstract: A two cycle internal combustion engine is disclosed, which essentially comprises a cylinder consisting of a sleeve and a cylinder block housing the sleeve therein. The cylinder has a groove formed between the sleeve and the cylinder block and at least one lubricant outlet port having one end opened to the inside of the sleeve and the other end communicating with the groove. A lubricant inlet port is formed in a crankcase or an air-fuel intake passage of the carburetor connected to the crankcase, and is connected to the groove through a lubricant passage means including a check valve disposed therein.

Abstract: The rotating combustible mixture in the crankcase of a two-cycle gasoline engine is scooped into the transfer duct leading to the cylinder by a plurality of vanes extending over the crankcase flywheel and in close juxtaposition thereto.

Abstract: A two-stroke cycle diesel engine having at least one two-stroke cycle power cylinder-piston assembly incorporating uniflow scavenging and having two horizontally opposed pistons, at least first and second scavenging ports and two crankcases which may perform crankcase compression; a pump assembly including at least one scavenging pump cylinder-piston assembly of the reciprocating type which is separate from and is driven by the power cylinder-piston assembly; a scavenging air introducing device which introduces scavenging air compressed by the pump assembly to the first and the second scavenging ports through first and second passage systems, respectively; and a fume generating device incorporated in the second passage system and supplying fuel mist in an initial part of the air supplied through the second passage system; wherein the fume is supplied as stratified with exhaust gases so as to be heated by the exhaust gases toward decomposition and then the first passage system is interrupted before the pump as

Abstract: In a crankcase scavenged two-stroke internal combustion engine, a duct and at least one further passage extends between the crankcase chamber and the combustion chamber. There is a fuel/air mixture port leading into the duct and a pure air port leading into the duct or the crankcase chamber. The passage exits into the combustion chamber between the exit into that chamber from the duct and an exhaust port leading out of the combustion chamber. In operation fuel enters the combustion chamber in the air of the fuel/air stream entering the duct and air is additionally pushed into the combustion chamber by the downward movement of the piston through the passage and the duct. The fuel is separated from the exhaust port by a layer of air leading to better fuel consumption and higher oxidation combustion products.

Abstract: A two-cycle internal combustion engine includes a cylinder, a piston in the cylinder and a crankcase pump. The crankcase pump is divided into a first chamber and a second chamber by a membrane. At least one respective transfer passage connects each of the respective chambers to the cylinder. Inlets are provided for admitting pure air into the first chamber and for admitting carbureted air into the second chamber. Devices are provided for opening that one of the transfer passages communicating between the cylinder and the first chamber first and thereafter for opening the one of the transfer passages communicating between said cylinder and said second chamber during operation of the engine.

Abstract: A 2-cycle engine having a transfer passage communicating the crank room with the combustion chamber. An accumulation tank having a volume which is larger than the stroke volume of the piston is arranged in the transfer passage. A reed valve is arranged in the transfer passage between the crank room and the accumulation tank.

Abstract: A two-cycle engine including first set of passages formed outside a cylinder connecting a first crank case with scavenging ports for feeding air-fuel mixtures from the first crank case to the cylinder, second set of passages formed outside the cylinder connecting a second crank case with the scavenging ports for feeding air-fuel mixtures from the second crank case to the cylinder, and scavenging gas merging chamber cooperative with the first and second sets of passages and located upstream of the scavenging ports for restricting flow of air-fuel mixtures in vicinity of the scavenging ports. First and second pistons are mounted in opposed relation to each other in the cylinder, the first piston opening and closing an exhaust port and the second piston opening and closing the scavenging ports.

Abstract: A two-cycle internal combustion engine having reed-type intake valving, and especially configured and positioned intake and injector porting, with the porting constructed and arranged to improve various of the operating characteristics of the engine, and particularly adapted to increase the effectiveness of the injection through the injector porting.

Abstract: A fuel supply system for an internal combustion engine having inlet porting and a fuel supply passage with valve means therein, the cross-sectional area lying within the outside passage walls being greater in the region of the valve means than in a region upstream of the valve means. Means are provided in the passage tending to equalize the velocity of the fuel flow through the supply passage in different regions thereof.

Abstract: A manifold system for a two stroke cycle vertical shaft internal combustion engine. A series of horizontal bores are perpendicular to the vertical shaft. A piston located in each bore establishes a combustion chamber and a fuel-air mixture supply chamber therein. A passage connects the supply chamber to the combustion chamber and a manifold system connects the supply chamber to a mixing chamber. Each mixing chamber is connected to an independent fuel supply and to a common air supply. A valve is located between the mixing chamber and the supply chamber to control the communication of a fuel-air mixture between the mixing chamber and the supply chamber. When the piston moves toward the combustion chamber a fuel-air mixture therein is compressed and at the top of the stroke ignited to produce combustion. As the piston moves toward the combustion chamber, the supply chamber expands and draws in a fuel-air mixture.

Abstract: In a uniflow, double-opposed piston type two-cycle internal combustion engine of the type having first and second crank chambers attached to the ends of a cylinder, first and second pistons disposed in the first and second crank chambers, respectively, and slidably fitted into the cylinder so as to move toward and away from each other, an exhaust port formed through the cylinder wall and opened and closed by the first piston, and a plurality of scavenging ports formed through the cylinder wall and opened and closed by the second piston, an improvement comprising means for feeding the rich air-fuel mixture to some of the scavenging ports, means for feeding the lean air-fuel mixture or the air to the remaining scavenging ports, and the lean mixture or air scavenging ports being uncovered and opened earlier than the rich mixture scavenging ports, whereby the scavenging efficiency may be improved and the amount of air-fuel mixture escaping through the exhaust port together with the combustion products may be mini

Abstract: A 2-cycle engine having a transfer passage communicating the crank case with the combustion chamber. The transfer passage comprises a first passage and a second passage. The first passage has a long length and a small cross-sectional area for causing a fresh combustible mixture to flow at a high speed. The second passage has a short length and a large cross-sectional area for causing a fresh combustible mixture to flow at a low speed. An exhaust gas recirculation device is provided for recirculating the exhaust gas from the exhaust system into the intake system of the engine.

Abstract: A 2-cycle engine having a scavenging passage communicating the crank case with the combustion chamber. The scavenging passage comprises a first passage and a second passage. The first passage has a long length and a small cross-sectional area for causing a fresh combustible mixture to flow at a high speed. The second passage has a short length and a large cross-sectional area for causing a fresh combustible mixture to flow at a low speed. In order to easily start the engine, a fuel pump is provided for directly feeding the fuel into the crank case in response to the operation of the choke mechanism when the engine is started.

Abstract: A 2-cycle engine having a transfer passage communicating the crank case with the combustion chamber. The transfer passage comprises a first passage and a second passage. The first passage has a long length and a small cross-sectional area for causing a fresh combustible mixture to flow at a high speed. The second passage has a short length and a large cross-sectional area for causing a fresh combustible mixture to flow at a low speed. The second passage is connected to the crank room via the bypass passage. A normally closed valve is arranged in the bypass passage. The valve is opened when the engine is operating under a heavy load.

Abstract: Fuel porting and passage arrangements including transfer porting and passages between the crankcase and the combustion side of the piston, together with intake porting and passage arrangements for delivering fuel to the crankcase. The transfer and intake passages include portions of regions common to both or in communication with each other in relationships providing not only for direct delivery of fuel to the crankcase but also for augmenting fuel transfer into the combustion space.

Abstract: A two-cycle internal combustion engine having reed-type intake valving, and specially configured and positioned intake and injector porting, with the porting constructed and arranged to improve various of the operating characteristics of the engine, and particularly adapted to increase the effectiveness of the injection through the injector porting.

Abstract: In the engine the side wall of the piston is provided with a perforation at a portion not facing an exhaust port of the cylinder for communicating the cylinder wall with the crankcase chamber.

Abstract: A multicylinder two-stroke internal combustion engine has a plurality of reciprocating pistons arranged in a circle about a central cavity in which is located a rotary distributor driven in timed sequence with operation of the pistons. The rotary distributor includes internal cavities which may connect through ports in its outer cylindrical surface with the working cylinders to control the flow of intake air, scavenging air and/or fuel to the working cylinders. Scavenging air can be precompressed either in a preceding cylinder, taken in ignition order, or in the crank chambers beneath the pistons.

Abstract: A two-cycle internal combustion engine having a crankcase with a crankshaft rotatably mounted therein, a cylinder extending from the crankcase and having a piston slidably positioned therein with a connecting rod extending between the piston and the crankshaft, a combustion chamber defined at the end of the cylinder remote from the crankcase, an inlet channel communicating with the crankcase at one end and with an air-fuel mixture providing means at the other end, timing means to control opening and closing of the inlet channel to the crankcase, such timing means preferably being the piston skirt, a boost port extending from the inlet channel at a position between the air-fuel mixture providing means and the crankcase timing means at one end and opening to the cylinder volume at the other end, and a reed valve disposed in the boost port and oriented to control flow such that the air-fuel mixture may flow through the boost port into the cylinder but preclude reverse flow from the cylinder to the input channel.

Abstract: In a two-stroke, water-cooled internal combustion engine the improvement is disclosed which permits to have a removable cylinder liner type of engine in spite of the intricate constructional arrangement of such engines having transfer ports and exhaust ports. The improvement consists in that the transfer and exhaust ports are formed through the liners and flanged fittings are provided between the liner transfer ports and the transfer ducts so as to ensure complete tightness. Differential-firmness gaskets are provided where appropriate and the engine is then assembled by stay bolts as usual. The construction suggested by the invention not only solves the tightness problem satisfactorily, but minimizes the stresses on the liners, especially the bending stresses.

Abstract: Disclosed is an internal combustion engine capable of creating an active thermoatmosphere in the combustion chamber at the beginning of the compression stroke. The active thermoatmosphere continues to be maintained during the compression stroke when the engine is operating under a partial load. The self ignition of the active thermoatmosphere is caused in the vicinity of the top dead center position.

Abstract: A two-cycle air-cooled engine has a carburetor with a throttle valve operated by a manual control member. A heat sensitive valve mounted on the engine cylinder head closes to cut off a supplementary air supply to the induction passageway and thereby richen the air-fuel mixture to prevent seizure upon overheating. When the manual control member is in position corresponding to idling of the engine, the member actuates means which introduce additional air into the induction passageway leading to the engine, to lean the air-fuel mixture.

Abstract: A fuel scavenger for a two-cylinder, two-cycle horizontal upper and under type internal combustion engine. The engine has a crankcase with a revolving crankshaft which is turned by the reciprocating movement of a piston in each of the cylinders. A carburetor supplies air/fuel mixture to the crankcase via respective intake passages and reed valves. A fuel catcher is located in each crankcase, substantially shielded from the scouring action of air/fuel mixture impelled by the crankshaft, and the fuel catcher of each cylinder is connected to the intake passage of the other cylinder via a respective check valve.

Abstract: Disclosed is a 2-cycle engine having a scavenging passage communicating the crank case with the combustion chamber. The scavenging passage comprises a first passage and a second passage. The first passage has a long length and a small cross-sectional area for causing a fresh combustible mixture to flow at a high speed. The second passage has a short length and a large cross-sectional area for causing a fresh combustible mixture to flow at a low speed. The vaporization of the fresh combustible mixture is prometed in the first passage and, in addition, the fresh combustible mixture flows into the combustion chamber at a low speed. As a result of this, an active thermoatmosphere combustion is caused in the combustion chamber.

Abstract: A single-cylinder two-stroke engine having a carburetor, an intake tube leading into the crankcase, and an intake valve between the intake tube and the crankcase has its carburetor flow axis essentially parallel to the crankshaft axis and has the intake valve and the downstream part of the intake tube arranged so that their axis forms an acute angle with the planes perpendicular to the crankcase axis.

Abstract: An intake gas distributor extending from one carburetor to a pair of two-cycle internal combustion cylinders. The cylinders are horizontal and arranged one above the other. The distributor is bifurcated, and its branches are proportioned and arranged so that air/fuel mixture in substantially equal quantity and density flows to both cylinders, despite the inherent tendency of fuel to settle out of the mixture, especially at low load conditions.

Abstract: Two stroke engines of the crankchamber precompression type are described which include an intake port leading from the intake passage and cyclically opened to the crankchamber by means of the piston. Auxiliary intake passages extend between the intake passage and the scavenging passages and include reed type check valves so that the intake mixture is introduced into the crankchamber as soon as the piston upward movement starts. Additional mixture can also be supplied through the auxiliary passages in the scavenging stroke of the engine operation.

Abstract: In operation of an internal combustion engine, a lamina of air is introduced into the combustion chamber to line the wall thereof, the fuel being admitted into the interior of the lamina of air. In a two-stroke engine, air entering the combustion chamber is driven by the incoming fuel mixture to form a lamina which lines the wall of the combustion chamber.

Abstract: A two-stroke cycle internal combustion engine wherein the cylinder is provided with spaced inlet ports with an intermediate wall section therebetween and the piston face is provided with a T-shaped guide outstanding therefrom, the center leg of the guide terminating in a face, which confronts the intermediate wall section when the piston is at bottom dead center, the face increasing in width from the outer edge of the guide leg to the root thereof.

Abstract: A two cycle loop scavenging engine of the crankcase precompression type having a pair of equally dimensioned scavenging passages 14, 16 disposed in a cylinder block 10 behind an apertured cylinder line 12. The passages are symmetrically positioned on opposite sides of a vertical plane A including the cylinder axis and oriented at an angle .theta. to a plane normal to the crankshaft 17. Recessed notches 22, 23 in the lower periphery of the piston skirt 20a mate with notches 12e, 12f, respectively, in the bottom of the cylinder liner at the entrances to scavenging passages 14, 16 at the bottom of each piston stroke. The notches 22, 23 have unequal cross-sectional areas to compensate for unequal fuel mixture pressures at the scavenging passage entrances caused by the rotation of the crankweb 17a, thereby producing a more uniform fuel mixture distribution in the cylinder.

Abstract: A two-cycle internal combustion engine having reed-type intake valving, and specially configured and positioned intake and injector porting, with the porting constructed and arranged to improve various of the operating characteristics of the engine, and particularly adapted to increase the effectiveness of the injection through the injector porting.

Abstract: A two-cycle internal combustion engine having reed-type intake valving, and multiple injector passages and porting constructed and arranged to improve various of the operating characteristics of the engine, and particularly adapted to increase the effectiveness of fuel injection through the injector passages.

Abstract: Disclosed herein is a two-cycle internal combustion engine including a cylinder having a fuel intake port, an exhaust port, and an inlet port located intermediate the intake port and the exhaust port, a piston reciprocably mounted in the cylinder, a crankcase having a drains collecting area, and a conduit means connected in liquid communication with the drains collecting area and with the inlet port, whereby the drains are recycled or recirculated from the drains collecting area to the cylinder for ultimate combustion therein in response to the cyclical variation of pressure in the crankcase and in the cylinder.

Abstract: Two stroke engines of crankcase precompression type comprising an integral main body block which includes a cylinder block section and a crankcase upper section, and to which a crankcase lower section and a cylinder head are secured at the lower and upper ends thereof. The body block is formed with scavenging passages of which lower ends are substantially straight so as to facilitate removal of the block from manufacturing dies. The engine includes a crankshaft which is supported by bearings secured to the crankcase lower section by means of separate semi-circular retaining members.

Abstract: A sixty degree, V-6 engine for an outboard motor includes loop scavenging and charging with a pair of oppositely located input passageways with differently angles sidewalls and which provide progressive, smooth constriction to the charging port to establish a highly effective velocity pattern across the top of a flat piston. Cast "Blister" cylinder liners with integral ports are integrally cast into an aluminum block. The block is cast with a single manifold between the two cylinder blanks. A milling cutter is located within the manifold to open the exhaust passageways. A T-shaped manifold is secured to close the manifold and define a pair of separate exhaust passageways. The cylinders are rotated to align the upper and lower inlet ports and particularly to locate the exhaust port projecting downwardly into a center manifold. Adjacent piston rods are mounted upon a common crankshaft pin.

Abstract: Disclosed herein is a two-cycle, internal combustion engine including a piston mounted for reciprocative movement inside a cylinder and having a top and an inlet face portion which periodically covers and uncovers an intake port during reciprocative movement of the piston, a circumferentially extending recess in the piston at the juncture between the top and inlet face portion thereof and having an inner wall which extends in front of a limited portion of the intake port located farthest away from the outlet port such that, as the piston inlet face starts to uncover the intake port, an initial flow of fresh charge flows through only the limited portion of the intake port and is deflected by the recess inner wall towards the cylinder head and along the cylinder intake wall in a direction generally parallel to the longitudinal axis of the cylinder, and a deflector carried on the top of the piston and spaced inwardly from the piston recess for deflecting additional streams of fresh charge flowing through the int

Abstract: Crank-chamber precompression type two cycle engines having scavenging ports connected with the crank-chamber through scavenging passages. An air supply passage is connected through a reed type check valve with at least one of the scavenging passages at the upper portion thereof so that air is introduced into the scavenging passage in the ascending stroke of piston movement and discharged into the combustion chamber in the descending stroke of the piston movement to effect scavenging. The air passage is provided with a control valve which is interconnected with the engine throttle valve so that the amount of air supply through the air passage can be controlled in accordance with the load condition of the engine operation.

Abstract: Disclosed herein is an internal combustion engine comprising a piston movable relative to a cylinder and a crankcase between top dead center and bottom dead center positions and relative to first, second and third positions respectively spaced from top dead center position at respectively greater distances, whereby the crankcase is subject to cyclical conditions of relatively high and low pressure, a transfer chamber, a reed valve controlled port for supplying fresh air to the transfer chamber when the transfer chamber is subject to low pressure, a carburetor for supplying a fuel/air mixture to the crankcase when the crankcase is subject to low pressure, a transfor port providing communication between the transfer chamber and the crankcase during conditions of low pressure in the crankcase and during piston travel between top dead center position and the first position whereby to cause introduction into the transfer chamber of fresh air, whereby the air introduced into the chamber is isolated during piston mo

Abstract: A two-stroke internal combustion engine has a plurality of transfer ports controlled by the movement of the piston, the transfer ports being at the ends of passages each extending from the interior of the crankcase through the cylinder wall so as to place the crankcase interior in communication with the upper working space in the cylinder above the piston when its associated transfer port is uncovered by downward movement of the piston. Some, but not all, of the transfer port passages are provided with pressure-responsive non-return valves which are lightly spring-biassed towards closed positions in which they restrict the gas flow through those passages, in the direction towards the upper working space in the cylinder, causing the gas flow from the crankcase to travel at increased velocities through the remaining transfer port passage or passages.

Abstract: A two-cycle internal combustion engine having reed-type intake valving, and specially configured and positioned intake and injection porting, with the porting constructed and arranged to improve various of the operating characteristics of the engine.

Abstract: A two-cycle crankcase compression internal combustion engine having extended and specially positioned intake porting and reed-type intake valves, with the porting and valves arranged to improve various of the operating characteristics of the engine.

Abstract: Apparatus and method for use associated with an internal combustion engine whereby drainage of fuel, vapor and oil drainage from the crankcase thereof is recovered and introduced in a metered fashion into the principal fuel line of the engine. A dual-chambered device is employed having an upper chamber connected to the crankcase for accumulating drainage, and a lower chamber serving as a mixing chamber connected in series with the principal fuel line. At the top of the mixing chamber there is mounted a diffuser plate for receiving and dispersing the drainage as it falls from a valve assembly in the drainage chamber directly above. The diffuser plate acts to disperse the drainage in a thin film over the surface of the plate after which the drainage falls off the sides of the plate and mixes readily with the fuel from the principal fuel supply in the mixing chamber. Also provided across the top of the diffuser plate is a channel which acts as a baffle to enhance the mixing action of the drainage with the fuel.