Abstract: An internal combustion engine is disclosed which includes an induction passage divided into first and second intake passages leading to first and second groups of cylinders, respectively. The second intake passage has at its entrance a stop valve which closes to disconnect the second group of cylinders from the induction passage when the engine load is below a predetermined value. Main fuel supply means supplies a controlled amount of fuel into the induction passage. Auxiliary fuel supply means is provided for supplying a predetermined amount of fuel into the second intake passage downstream of the stop valve for a predetermined period of time after the engine load exceeds the predetermined value.

Abstract: Engine manifold vacuum is inverted by an in-line vacuum inverter which provides a power source for an EGR valve actuator for providing desired EGR flow in a predetermined range of engine power loading and EGR flow is cut off outside the range. The invention utilizes a vacuum inverter employing a pair of spaced diaphragms for controlling an atmospheric air bleed valve to a vacuum chamber powered by manifold vacuum. The diaphragms are spring loaded so as to seek equilibrium positions as vacuum in the chamber varies force. The inverter produces a vacuum output signal which changes inversely with changes in engine manifold vacuum.

Abstract: In an internal combustion engine with a carburetor control device, a throttle valve of the carburetor is arranged in the intake port which is defined by the cylinder block of the engine and a control linkage is established between the crankshaft and the throttle valve in order to control the speed of the throttle valve in accordance with a set value. The connection linkage is arranged in the interior of the crankcase and extends completely within the cylinder block and the crankcase interior.

Abstract: An exhaust timing control device for a two-cycle internal combustion engine, in which a valve member functioning as the upper edge of an exhaust port that opens into the inner circumference of a cylinder is disposed in the upper wall of an exhaust passage from said exhaust port. A valve hole having an elongated cross-section is opened in the wall of the exhaust passage in the vicinity of the exhaust port, and is formed at an inclination with respect to the axis of said cylinder. The valve member is arranged slidably in said valve hole so that it can be retracted into said valve hole until the leading end portion thereof becomes substantially coextensive with the inner wall surface of said exhaust passage.

Abstract: An exhaust gas recirculation apparatus for diesel engines includes an exhaust gas recirculation passage for recirculating exhaust gases from an exhaust pipe to an intake pipe, a valve body for controlling the cross sectional area of the recirculation passage and a pressure regulator for detecting an amount of fuel injection and to output a signal. A diaphragm device is operatively connected to the pressure regulator to receive a pressure signal to control the position of the valve body, whereby in response to an increase of fuel injection the cross sectional area of the recirculation passage is decreased.

Abstract: An exhaust gas recirculation valve pintle is secured on a hollow valve stem by a radially elastic retaining ring which allows the pintle to be withdrawn from the stem for removal of exhaust gas deposits.

Abstract: A sealed butterfly-type valve for an exhaust gas passage in an engine intake mainfold, the valve having a rotatably mounted stem carrying a gas flow modifying valve element disposed in the passage, and sealing against escape of exhaust gases along the stem is prevented by axially biasing the stem to urge an annular axial sealing face on the stem into engagement with an annular high temperature resistant bearing element of compressed graphite or the like surrounding the stem on the passage wall.

Abstract: A two-cycle engine is disclosed which conventionally includes a piston that reciprocates between a closed combustion chamber and crankcase. The piston reciprocates through a connecting rod that is eccentrically connected to the crank discs of a crankshaft. The crankcase is partially circular in configuration, and the crankdiscs conform in shape to the crankcase. Each crank disc has an annular recess or pocket extending around its periphery for approximately 180.degree. and in opposition to the eccentric point of connection of the connecting rod. The pockets cyclically communicate with a fuel inlet port and carburetor, both of which are positioned below the crankshaft rotational axis on the downstroke side of the crankcase. Fuel transfer passages between the crankcase and combustion chamber are positioned to receive the fuel charge from each recess as it is thrown tangentially upward with rotation of the crank discs.

Abstract: A control device for Diesel engines is proposed in which a rapid shutoff of the engine can be effected by evacuating the suction chamber of the injection pump. The control device includes a supply pump and a reversal valve, which in a stop position connects the suction chamber with the intake side of the supply pump and connects the compression side of the supply pump with the fuel tank. A check valve is provided in the supply line between the supply pump and the fuel filter which, when closed, is vacuum-tight; this check valve is disposed to open toward the filter, counter to the force of a valve closing spring. Another check valve, comprising an overflow valve determining the suction chamber pressure, is provided in an overflow line leading from the suction chamber to the fuel tank; this overflow valve is also vacuum-tight when closed. When the reversal valve is actuated by an electromagnet, a similar key-actuated shutoff to that known in gasoline engines can also be effected in Diesel engines.

Abstract: A two stroke cycle internal combustion engine having a closed crankcase adapted to receive a air-fuel mixture and a cylinder extending from said crankcase,a piston reciprocally movable in said cylinder which alternately produces a low pressure condition in said crankcase as it approaches top dead center and a high pressure condition in said cylinder as it approaches bottom dead center,a fuel reservoir for supplying liquid fuel to the air fuel mixture in said crankcase, a bypass passage connecting said crankcase to said cylinder,and a conduit connecting said crankcase to the fuel reservoir for pumping fuel accumulated in said crankcase during starting into said reservoir, and a unidirectional flow control device in said conduit for preventing return flow from said reservoir to said crankcase.

Abstract: An apparatus for regulating the quantity of air-fuel mixture supplied to each of the cylinders of an internal combustion engine and for selectively obstructing the flow of the air-fuel mixture to one or more such cylinders to effectively disable those cylinders. A butterfly valve is provided for each cylinder of the engine and is positioned in the passage in the intake assembly which supplies the air-fuel mixture to that cylinder at a location adjacent the end of the passage which is remote from the carburetor. The valves are controlled individually or in groups by a manually operated control mechanism. In one embodiment, the intake assembly includes a valve plate which is positioned between the engine block assembly and the intake manifold, with a portion of each branch passage being defined by a respective opening through the valve plate and each butterfly valve being provided in a respective one of such openings in the valve plate.

Abstract: An internal combustion engine operating on a two-stroke cycle and including a piston 1 reciprocable in a cylinder 2 to drive a crank shaft and also to inhale and compress a volume of air is characterized by a second piston 15 working in a separate cylinder 13 co-axial with and opposed to the first cylinder 2, the piston 15 being synchronized with the first piston 1. The second piston 15 acts to introduce a compressed charge of mixture of air and fuel through a non-return valve 30 into a relatively small ignition chamber 34 including a sparking plug 35 and communicating with a combustion chamber 11 in the head of the cylinder 1. The piston 15 draws air/fuel mixture along an inlet passage 20, past a non-return reed valve 21 and into a crank case 22. On the return stroke of the piston 15 the mixture passes through passages 23 in the piston controlled by a non-return valve 24 and also along passages 14 and around the piston.

Abstract: The characteristics of a diesel engine exhaust gas recycling system are improved by reducing the percentage of the recycled exhaust gas in the low and high speed ranges of the engine. This is accomplished by the use of a conversion valve which decreases the input negative pressure to the vacuum amplifier which controls the recycling valve.

Abstract: An exhaust gas recirculation control system for an internal combustion engine for removing nitrogen oxides (NOx) in exhaust gases comprises a positive pressure delay valve in a negative pressure passage for introducing intake negative pressure in the proximity of a throttle valve of a carburetor into an exhaust gas recirculation control valve to maintain the negative pressure therein during an acceleration, thereby effecting the exhaust gas recirculation even when accelerating to purify the nitrogen oxides in the exhaust gas.The exhaust gas recirculation control system further comprises a positive pressure delay valve in an advance negative pressure passage for introducing the intake negative pressure in the vicinity of the throttle valve of a carburetor into a distributor and synchronized with the above positive pressure delay valve to maintain the distributor advanced, thereby keeping a good combustion of fuel mixture.

Abstract: An exhaust gas recirculation system for an internal combustion engine. The internal combustion engine including at least one combustion chamber; an intake mechanism for delivering a combustible fluid mixture to the combustion chamber; an ignition system for igniting the combustible mixture; and an exhaust system for carrying exhaust fluid produced by the combustion of the combustible fluid mixture away from the combustion chamber. The exhaust gas recirculation system includes a mechanism for diverting a portion of the exhaust fluid passing through the exhaust system; a conduit attached to the diverting mechanism for carrying the diverted fluid to the intake mechanism of the internal combustion engine; a heat sink connected to the conduit for removing heat from the diverted portion of the exhaust fluid; and a filter integrated along the conduit to remove particulate from the diverted exhaust fluid.

Abstract: An internal system for use in an internal combustion engine which includes a carburetor, a throttle valve and a check valve. A supplemental chamber is connected to an intake passage adapted to introduce therethrough air-fuel mixture from the throttle valve to a combustion chamber. The supplemental chamber is in communication with the intake passage at a position between the throttle valve and the check valve. The supplemental chamber is provided with an opening directed tangentially with respect to an inner cylindrical periphery of the intake passage. In another embodiment of the invention, a control passage is formed in communication between the supplemental chamber and the intake passage. A downstream end of the control passage is opened at a position adjacent to an initially opening position of the check valve.

Abstract: An apparatus is proposed which serves the purpose of controlling the exhaust gas recirculation quantity and the injection quantity in auto-igniting internal combustion engines. In this apparatus, an arbitrarily actuatable throttle valve is provided in the intake manifold, downstream of which a control pressure is withdrawn from the intake manifold and used to actuate a pneumatic adjustment device which determines the position of the quantity adjustment device of a fuel injection pump. This control pressure simultaneously serves to actuate an exhaust gas recirculation valve and acts counter to the force of a restoring spring in the work chamber of a second pneumatic adjustment device.

Abstract: A two-cycle internal combustion engine includes a crankcase extending from a cylinder and supporting a horizontally extending crankshaft, a piston mounted for reciprocative movement in the cylinder along an axis generally perpendicular to the crankshaft axis, an air and/or fuel inlet on the crankcase including a flange disposed in a first plane extending generally parallel to the crankshaft axis and perpendicular to the piston axis and having a major axis extending transversely of the crankshaft axis, and a manifold having an outlet flange which is disposed in the first plane and has a major axis extending generally parallel to the major axis of the crankcase inlet flange and further having an inlet flange disposed in a second plane extending generally vertically and having a major axis which extends generally horizontally and is angularly related at a substantial angle to the major axis of the crankcase inlet flange.

Abstract: A control device for controlling a recycling of exhaust gases into an intake system of a self-igniting internal combustion engine which includes a signal generator, constructed as a pneumatic control slide valve mounted to a fuel injection pump. The signal generator is controlled by the respective instantaneous load conditions as a function of the rotational speed of the engine and the load on the engine by a non-reactive scanning of a position of a control rod associated with the fuel injection pump. The signal generator is coupled with the control rod and a pneumatic signal is transmitted by the signal generator in dependence upon a position of a control piston of the signal generator.

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.