Abstract: A lubricating system for a two cycle crankcase compression engine wherein a recirculating lubricating system is provided for lubricating at least one main bearing of the crankshaft and a second non recirculating lubricating system is provided for lubricating other components of the engine. A drain system drains lubricant accumulating within the crankcase back to the engine through its induction system upstream of a check valve contained therein.

Abstract: A fuel supply system for an outboard motor including a combined fuel filter and fuel pump supported within the power head of the outboard motor for drawing fuel from a remotely positioned fuel tank and delivering it to the charge forming device of the outboard motor.

Abstract: A fuel system for crankcase scavenged two cycle spark ignition engines which includes a specialized valve assembly connecting a source of propane gas and a source of oil to the engine. An automatic main valve connects the source of gas to the engine port and also senses pulses from the engine crankcase. A control valve interconnected to a venturi controls the air and oil supply to the engine.

Abstract: A lubricating system for a two cycle internal combustion engine as applied to an outboard motor wherein small amounts of lubricant can be pumped by a diaphragm type pump through the use of an air bleed that mixes air with the lubricant being pumped. Pulsation variations are minimized by supplying the pump with lubricant with a constant volume delivery chamber.

Abstract: A two-cycle engine has an lubricating system for lubricating rubbing parts in a crankcase. A fuel injector is provided on a wall of an intake passage for injecting fuel toward an intake port of the engine. An oil injecting port is formed in the wall of the intake passage, and the fuel injector is provided for injecting fuel toward the port so as to mix with the lubricating oil.

Abstract: An apparatus and method for maintaining the control of lubricant to a two cycle engine so as to provide adequate lubrication without over lubrication and deleterious exhaust conditions, such as smoke. The system includes a lubricant pump that has both its output and its timing of discharge variable. Under one range of running conditions, the normal conditions, the output of the pump is maintained constant and the timing of the output is varied. Under high speed, high load conditions, the time of operation of the pump is held constant and the output time of the pump is varied.

Abstract: Several embodiments of fuel supply systems for outboard motors and particularly those embodying fuel injection systems and remotely positioned fuel tanks. In each embodiment, a device is incorporated in the power head of the outboard motor for maintaining a uniform pressure of fuel delivery to the fuel injection nozzles by recycling a portion of the fuel back into the fuel system and within the power head. In some embodiments, the fuel is recycled directly into the fuel line before the fuel pump. In others, the fuel is recycled to either a delivery tank or an accumulator chamber.

Abstract: The invention relates to a handheld portable tool driven by a two-stroke engine equipped with a pneumatically actuated injection pump. Injection pumps for two-stroke engines are generally rigidly connected to the engine so that the injection line can be rigid and as short as possible. This, however, leads to operational disturbances in the injection pump. To eliminate these disturbances, the injection pump is mounted in a thermally insulated handle housing portion of the tool which is damped with respect to the vibrations of the engine and is connected to the latter via flexible connecting lines.

Abstract: A lubricant system for an internal combustion engine of the type employed to power a vehicle that does not have a braking system of its own. In connection therewith, lubricant is supplied to the engine in response to throttle valve position. Additional lubricant is supplied under deceleration conditions when rapid closure of the throttle valve will not necessarily be accompanied by rapid reduction of engine speed so that additional lubricant is required.

Abstract: A fuel, lubricant supply system for a carburetor of a two-cycle internal combustion engine wherein both fuel and lubricant are delivered to the fuel bowl of the carburetor. The amount of lubricant delivered is proportioned in response to the air flow through the carburetor and the amount of fuel delivered is controlled in response to the output pressure if the lubricant pump for preventing the operation of the engine with insufficient lubricant. In one embodiment, the air flow is sensed by sensing static pressure at the throat of the venturi of the carburetor and in the other embodiment, the air flow is sensing dynamic air pressure at the inlet to the carburetor.

Abstract: An oil injection system is provided for a two cycle crankcase compression internal combustion engine. A metering pump (74) draws oil from an oil tank (52) and controls the amount of oil supplied to the fuel supply system upstream of the fuel delivery device (24). The fuel supply system and the metering pump are both variably controlled by the fuel supply control (28).

Abstract: A marine propulsion system has a conduit (14) connected between a water cooled internal combustion engine (4) and a remote fuel tank (12). The conduit has a first passage (16) supplying fuel from the tank to the engine, a second passage (18) supplying cooling water from the engine towards the tank, and a third passage (22) returning water from the second passage back to the engine. The passages are in heat transfer relation to the conduit.

Abstract: Fuel injection arrangements having pneumatically driven injection pumps utilize the fluctuating crankcase pressure whereby the injection time point is fixed by the system. The injection time point can be fixed so as to depart from the course of the pressure in the crankcase if the crankcase pressure is applied to the injection pump via an opening controlled by the piston and if the pressure drop is directed to the combustion chamber via a relief opening. However, it has been shown that this kind of control produces considerable problems with respect to fast-running two-stroke engines. Accordingly, it is a feature of the invention to provide a check valve in the connection between the relief opening and the injection pump and to position this check valve so that it opens in the flow direction toward the combustion chamber.

Abstract: A separated lubrication type two-cycle internal combustion engine system having: a lubricating oil pump capable of discharging lubricating oil at a rate higher than the rate at which an internal combustion engine needs to be lubricated, the lubricating oil pump being disposed in the vicinity of one of projecting ends of a crankshaft and having an inlet communicating with a lubricating oil tank and a pair of outlets one of which communicates with the interior of the internal combustion engine and the other of which communicates with the lubricating oil tank; and a drive member disposed at the one of the projecting ends of the crankshaft to drive the lubricating oil pump by the torque of the engine.

Abstract: A carburetor and chain oiling assembly and method of manufacturing the same for use in a chain saw. The assembly generally comprises a carburetor section, an oil pump section and a cover connecting the two sections. The cover can connect the oil pump section to the carburetor section forming a cover for a carburetor fuel diaphragm and a working chamber with an oil pump diaphragm. The cover has a gas conduit between the carburetor housing and the working chamber such that gas pulses from an engine crankcase can be supplied to the working chamber to operably move the oil pump diaphragm to provide a continuous and automatic metered flow of oil to a saw chain.

Abstract: A marine outboard drive unit (10) includes a two-cycle internal combustion engine (14), an oil storage tank (30) storing lubricating oil for the engine, and an assembly (44) mounted to the tank and extending into the tank for drawing oil from the tank and indicating the amount of oil in the tank. The assembly includes a collar (60) mounted to the tank in a top opening (42) and having first and second tubular portions (62, 64) extending integrally downwardly therefrom. The first tubular portion (62) is connected through a flexible coupling (80) to a lower tubular portion (78) formed on the outer surface of a cup member (74) mounted to the second tubular portion (64). The second tubular portion (64) retains an annular float member (66) and magnet (112) therearound in the annular space (76) between the second tubular portion (64) and the cup member (74).

Abstract: An oil injection system is provided for a two cycle crankcase compression internal combustion engine. A crankcase pressure driven oil pump (70) draws oil from an oil source (52, 54) and delivers pumped oil through an oil output line (64) to the fuel supply system. A solenoid valve (72) in the oil output line controls the flow of pumped oil to the fuel supply system.

Abstract: A marine propulsion system (200) having an outboard two cycle internal combustion engine (212) and an oil-fuel mixing fuel delivery system (2, 5, 7) has a vapor separator (702) connected to prevent excess oil in the mixture as fuel runs out. The vapor separator (702) has a fuel inlet (704) receiving fuel from the fuel tank (5), a fuel outlet (706) delivering fuel to the fuel inlet (4) of the oil-fuel mixer (2), and a vapor outlet (708) delivering vapor or air through a bypass connection (710) to the suction intake side of a fuel pump (11) and bypassing the mixer (2). The fuel pump (11) suctions oil-fuel mixture from the mixer (2).

Abstract: A system is provided for relieving gas pressure developed in a crank case under an internal combustion engine piston as the reciprocating piston travels from top dead center toward and beyond bottom dead center, and wherein a rotary breather valve is employed. The rotary valve has a rotary sleeve rotatable within a fixed sleeve, the rotary and fixed sleeves respectively having first and second arcuate ports which come into increasing and decreasing registration in timed relation to the piston travel, such decreasing registration terminating after the piston reaches bottom dead center. Oil and air mist are discharged through the registered ports during said piston travel.

Abstract: A two-stroke internal combustion engine is fuelled by liquified or compressed natural gas. Lubricating oil, in a solution with liquid petroleum, is atomized in a fuel gas/air stream before entering a combustion chamber.

Abstract: A marine propulsion system includes a two cycle water cooled crankcase compression internal combustion engine (52) including a vapor separator (33), a remote fuel tank (60), and a fuel pump (62) in the tank for delivering fuel to the engine in response to crankcase pulse pressure. A combination conduit (64) between the fuel tank and the engine includes a first passage (66) communicating crankcase pulse pressure from the engine to the fuel pump in the tank, a second passage (70) supplying fuel from the pump in the tank to the engine, a third passage (74) returing fuel vapor from the vapor separator at the engine back to the tank, a fourth passage (78) supplying cooling water from the engine towards the tank, and a fifth passage (82) returning water from the fourth passage back to the engine.

Abstract: A marine propulsion system (2) with an outboard engine (4) has an oil-fuel mixing valve (16) within the engine cowl (6). A first crankcase pressure driven fuel pump (20) delivers fuel from a remote fuel tank (14) to the mixing valve, and a second crankcase pressure driven fuel pump (22) delivers mixed oil-fuel from the mixing valve to the engine. The arrangement provides adequate fuel pressure to overcome the added pressure drop across a reduced size mixing valve, all fitting within the engine cowl. The crankcase pressure pulses to the fuel pumps are 180.degree. out of phase such that when the first pump is pushing pressurized fuel to the inlet of the mixing valve, the second pump is pulling suctioned oil-fuel from the outlet of the mixing valve, to increase fuel pressure differential and enhance operation of the mixing valve.

Abstract: A construction for mounting a carburetor on a machine having a driving internal combustion engine such as a portable chain saw, wherein the carburetor is directly fixed to a fuel tank annexed to the engine and the mixture delivery side of the carburetor is connected through a resilient heat-insulating pipe to the suction port of the internal combustion engine.

Abstract: In a two-stroke internal combustion engine, with fuel injection and controlled ignition, a valve is provided, which allows or prevents the inflow of fuel into the combustion chamber; such a valve is driven by an electromagnet controlled by a control unit as a function of the engine operating parameter.

Abstract: A marine propulsion system (200) having an outboard two cycle internal combustion engine (212) has a modified oil-fuel mixer (2, 602) preventing excess oil in the mixture as fuel runs out. The modified mixer includes an auxiliary chamber (602) having a fuel inlet (604) receiving fuel from the working chamber (22) of the mixer below a given level, a vapor inlet (606) receiving fuel vapor or air from the working chamber above the given level, and a vapor outlet (608) exhausting the vapor. When the fuel tank (5) runs dry, air is drawn through a transfer passage (38) in the mixer to one side of the moveable diaphragm (24), and fuel pump (11) suction is applied to both sides of the diaphragm to halt movement thereof and stop further pumping of oil from the oil tank (7) to the engine. The invention also enchances accuracy of the oil-fuel mixture ration during normal operation.

Abstract: The invention relates to a fuel injection arrangement wherein the pump piston of the fuel pump is driven by the pressure in the crankcase of the engine. The fuel injection arrangement includes an opening for tapping the crankcase pressure for actuating a diaphragm in the fuel pump. This opening is controlled by a moving part of the engine such as a crank web or the piston. The moving part closes the opening at least for a portion of the time during which injection occurs thereby delaying the onset of injection to permit a complete combustion during the previous combustion cycle.

Abstract: Disclosed herein is a two stroke internal combustion engine comprising a cylinder, a crankcase extending from the cylinder, a piston reciprocal in the cylinder and defining, with the cylinder, a variable volume combustion chamber and defining, with the crankcase, a crankcase chamber having a volume which varies inversely with respect to the volume of the combustion chamber, a transfer passage communicating, subject to piston movement, between the crankcase chamber and the combustion chamber, an air intake passage extending from the crankcase chamber and including therein a throttle valve movable between opened and closed positions to control engine speed, a reed valve located between the air intake passage and the crankcase chamber for controlling communication between the air intake passage and the crankcase chamber, a first fuel injector communicating with the transfer passage, a second fuel injector communicating with the air intake passage between the reed valve and the throttle valve, and a controller fo

Abstract: Several embodiments of separate lubricating systems for two-cycle internal combustion engines and particularly those of outboard motors. In each embodiment, the lubricating system includes a relatively large lubricant storage tank that is adapted to be carried in the hull of the associated watercraft and a relatively small lubricant delivery tank carried by the engine of the outboard motor. A pump is provided for transferring lubricant from the storage tank to the delivery tank and warning devices are incorporated to indicate when the level in each of the tanks falls below a predetermined value. Furthermore, the transfer pump is disabled upon the falling of the level of the liquid in the storage tank below a predetermined value. The pump is positioned in proximity to this storage tank and is juxtaposed and plumbed in such a way that it will not pick up foreign particles from the bottom of the tank, but will always have its inlet and outlet subject to liquid so that the pump will not run dry.

Abstract: A number of embodiments of outboard motors incorporating lubricating systems having a filter for filtering gravity flow of lubricant to the engine and for sensing a clogged filter condition. In each embodiment, a warning is given when the filter clogging condition is noted and furthermore there is provided an arrangement for reducing the speed of the engine and accordingly the lubricant consumption in response to such a clogging condition. In addition, the sensing device also provides an indication of the level of lubricant within the reservoir.

Abstract: In an engine lubricating system in which a measured amount of lubricating oil is supplied to the combustion chamber of an engine by a metering oil pump so that a larger amount of lubricating oil is supplied to the combustion chamber when the engine load is heavy than when the engine load is light. The amount of the lubricating oil to be supplied to the combustion chamber per unit engine revolution is corrected to be larger at high engine speed than at low engine speed.

Abstract: An apparatus comprising a housing, a wall dividing the housing into high and low pressure chambers having a pressure differential therebetween, the wall including a surface partially defining the high pressure chamber, and a passage communicating with the surface and between the high and low pressure chambers, a valve seat located on the surface adjacent the passage, a valve member movable into engagement with the valve seat for preventing fluid flow through the passage, and a mechanism for causing the valve member to move away from the valve seat with a snap action.

Abstract: Several embodiments of fuel injection systems for internal combustion engines wherein certain components of the engine are lubricated directly by lubricant supplied by a lubricant pump and the lubricant pump also supplies lubricant to a fuel injection pump. In some embodiments, the fuel delivered to the injection pump is mixed with the fuel pumped by the injection pump for delivery to the engine through an injection nozzle.

Abstract: A fuel and lubricating oil mixing system designed primarily for two-cycle engines. Lubricating oil and fuel are stored in separate containers and mixed prior to entering the carburetor. Fuel flow is monitored by flow detector which relays information to a control unit. This unit in turn controls valves and pumps, mounted on both lubricating oil and fuel lines, in order to maintain a preferred mixture ratio regardless of engine speed or fuel flow rate. Such control ratio makes possible maximum convenience and performance with minimum engine wear.

Abstract: A fuel tank includes a first container adapted to contain a fuel mixture, and a second container adapted to contain oil. A metering arrangement is provided for selectively delivering a measured quantity of said oil from the second container to the first container when fuel is added to the first container, the volume of the oil delivered to the first container being proportional to the volume of fuel added to the first container. A valve assembly is also provided for alternatively providing fluid communication between a metering chamber and the first container and the metering chamber and the second container and for permitting oil flow to the first container only when the fuel tank cap is removed.

Abstract: A fuel tank includes a first container adapted to contain a fuel mixture, and a second container adapted to contain oil. A metering arrangement is provided for selectively delivering a measured quantity of said oil from the second container to the first container when fuel is added to the first container. The volume of the oil delivered to the first container being proportional to the volume of fuel added to the first container. A valve assembly is also provided for alternatively providing fluid communication between a metering chamber and the first container and the metering chamber and the second container and for permitting oil flow to the first container only when the fuel tank cap is removed.

Abstract: A lubricating oil input system includes a joiner, a first ignition advance vacuum tube connected between the joiner and distributor of an internal combustion engine, a second ignition advance vacuum tube connected between the joiner and carburetor of the engine, a connecting tube connected between the joiner and an oil tank which contains lubricating oil and cleaner. The system further includes a small tube disposed within the connecting tube, joiner and second ignition advance vacuum tube; a filter means disposed at the joint region of the oil tank and connecting tube; and a returning means connected to the first ignition advance vacuum tube abutting against the joiner, so that the lubricating oil is directed from the oil tank through the lubricating oil input system into the carburetor to be mixed with gasoline.

Abstract: A two-stroke internal combustion engine of the crankcase scavenging type, in which a nozzle connected to a lubricant feed line is provided in the intake passage for picking up oil from a lubricant reservoir via a partial vacuum. For simple and sufficient lubrication and cooling of the crank gear in accordance with the respective requirements of the engine, the nozzle (62) is positioned in the area of the smallest cross-section of a Venturi-tube-like part (60) of the intake passage, and an injection pump (54) is provided for fuel delivery, which eliminates the need for an oil pump.

Abstract: A pump comprising a housing, an oil pumping chamber in the housing, an oil passageway in the housing communicating with the oil pumping chamber, an oil pumping piston reciprocally movable in the oil pumping chamber to produce oil flow into the oil passageway in response to reciprocation of the oil pumping piston, a switch mounted on the housing and adapted to be operably connected to a device for actuation thereof, and a mechanism for closing the switch in response to oil flow in the oil passageway.

Abstract: A lubricating system for a two-cycle internal combustion engine of an outboard motor wherein lubricant is mixed with fuel before delivery to the charge formers of the engine. The amount of lubricant mixed with the fuel is varied in predetermined steps in response to the amount of fuel consumed by the engine.

Abstract: A lubricating system for a two-cycle outboard motor in which lubricant is mixed with the fuel prior to delivery to the fuel bowl of the carburetor in a chamber located externally of the carburetor. The lubricant is supplied by a relatively large storage tank to a relatively smaller delivery tank that is positioned in proximity to the engine. A float operated control device is provided for maintaining an adequate lubricant level in the delivery tank and an arrangement is incorporated for insuring against operation of the pump in response to momentary changes in liquid level in the delivery tank due to inertial effects.

Abstract: A lubricating oil supply controller for a two-cycle engine is disclosed, wherein a lubricating oil is supplied to an intake air passage separately from fuel without mixing in advance the lubricating oil with fuel which is to be supplied to an engine. In this controller, a non-contacting type electrometer provided at a carburetor detects the fuel supply flow rate as a voltage. Thus detected voltage value is transmitted to a computer as a digital input through an analog-to-digital converter. This computer operates calculation by serving the input as a parameter and transmits a desired digital control signal to a step motor. The step motor is operated in response to the digital control signal and control a lubricating oil injection valve. In this way, the lubricating oil in its proper flow rate according to fuel supply flow rate is supplied to the engine.

Abstract: A fuel/lubricant supply system for a two-cycle engine having a tank that is divided by an internal wall into a lubricant reservoir portion and fuel reservoir portion. An arrangement is provided for transferring a metered amount of lubricant from the lubricant reservoir portion into the fuel reservoir portion in response to the signal transmitted from a sensing device that senses the amount of fuel added to the fuel reservoir portion.

Abstract: Several embodiments of separate lubricating systems for two-cycle internal combustion engines and particularly those of outboard motors. In each embodiment, the lubricating system includes a relatively large lubricant storage tank that is adapted to be carried in the hull of the associated watercraft and a relatively small lubricant delivery tank carried by the engine of the outboard motor. A pump is provided for transferring lubricant from the storage tank to the delivery tank and warning devices are incorporated to indicate when the level in each of the tanks falls below a predetermined value. Furthermore, the transfer pump is disabled upon the falling of the level of the liquid in the storage tank below a predetermined value. The pump is positioned in proximity to this storage tank and is juxtaposed and plumbed in such a way that it will not pick up foreign particles from the bottom of the tank, but will always have its inlet and outlet subject to liquid so that the pump will not run dry.

Abstract: The two-cycle internal combustion engine has a sump in a lower portion of the crankcase for collecting engine fuel drains and a crankshaft bearing lubrication system including a first conduit means connecting the upper crankshaft bearing in communication with the engine intake manifold, second conduit means connecting the upper crankshaft bearing in liquid communication with the sump and having an intermediate portion or reservoir, and third conduit means connecting the crankcase in communication with the reservoir. A first check valve located between the sump and the reservoir permits fuel drains to flow from the sump upwardly toward the upper crankshaft bearing in response to a suction created in response to the low pressure or vacuum in the intake manifold and prevents backflow from the reservoir to the sump.

Abstract: A metering pump employs a pump which is actuated by the fuel level gauge float assembly of the fuel tank to add metered quantities of an additive to the fuel tank. The quantity of metered additive is proportional to the quantity of fuel added to the tank. A container for the additive supply communicates with the fuel tank via a valve is actuated in response to the introduction of fuel into the fuel tank.

Abstract: A marine installation comprising a marine propulsion device including a propulsion unit having a lower unit supporting a propeller and a powerhead including a two-stroke internal combustion engine having an apparatus for feeding a fuel/oil mixture to the engine and including a fuel/oil mixture pump having an inlet and being operable to create suction at the inlet, a flexible hose releasably connected to and communicating with the inlet of the fuel/oil mixture pump, and a remote tank having an interior providing a fuel reservoir, having a fitting releasably connected to the flexible hose, having a top wall including a first opening which is adapted to afford filling of fuel into the interior of the tank and which is adapted to removably receive a cap covering the first opening, and a second opening spaced from the first opening, and having an oil storing, oil pumping and fuel/oil mixing device located in the tank and including an upper wall closing the second opening and being secured to the top wall of the ta

Abstract: A mechanism for pumping fluid in response to pressure pulses, the mechanism comprising a fluid pump including a reciprocating piston operable to pump fluid, a rotatable eccentric wheel including a cam surface, a linkage engageable with the cam surface for rotating the wheel in response to pressure pulses, and a linkage engageable with the cam surface for causing reciprocation of the piston in response to rotation of the wheel.

Abstract: A marine propulsion system is provided with a valve (2) for automatically mixing fuel and oil for a two cycle crankcase compression internal combustion engine. The valve operates on a pressure differential, such as that supplied from the suction intake vacuum side of a fuel pump. Fuel is alternately and cyclicly directed by a transitioning shuttle spool valve (50) through respective transfer passages (34, 38) to opposite sides of a diaphragm (24) to drive the diaphragm in reciprocal movement such that in a first half cycle the diaphragm is driven in one direction and expels fuel from its one side, and in the second half cycle the diaphragm is driven in the other direction and expels fuel from its other side. A plunger (48) operatively couples the diaphragm to the directional shuttle spool valve through spring biased lost motion detent means (52). The directional shuttle spool valve is actuated between its alternate positions near the end of the plunger travel stroke in each direction.

Abstract: A fluid pumping arrangement including a fluid pump including a suction port, and a fluid pumping device comprising a pump housing defining a recess, and a moveable wall which is located in the recess and which cooperates with the recess to define a variable volume pumping chamber. The pumping device also includes a fluid inlet communicable with the fluid pumping chamber and adapted to communicate with a source of fluid, a fluid outlet communicable with the fluid pumping chamber and communicating with the suction port, and an arrangement for effecting reciprocating movement of the moveable wall in response to alternate communication of the fluid pumping chamber with the fluid outlet and with the fluid inlet.

Abstract: Several embodiments of separate lubricating systems for two-cycle internal combustion engines and particularly those of outboard motors. In each embodiment, the lubricating system includes a relatively large lubricant storage tank that is adapted to be carried in the hull of the associated watercraft and a relatively small lubricant delivery tank carried by the engine of the outboard motor. A pump is provided for transferring lubricant from the storage tank to the delivery tank and warning devices are incorporated to indicate when the level in each of the tanks falls below a predetermined value. Furthermore, the transfer pump is disabled upon the falling of the level of the liquid in the storage tank below a predetermined value. The pump is positioned in proximity to this storage tank and is juxtaposed and plumbed in such a way that it will not pick up foreign particles from the bottom of the tank, but will always have its inlet and outlet subject to liquid so that the pump will not run dry.