Abstract: An outboard motor includes an engine, an engine holder disposed below the engine, a drive shaft housing which is disposed below the engine holder, an intake device including an intake manifold disposed to a side surface of the engine, a lubricant supply device for supplying lubricant oil to the engine, an oil filter disposed below the intake manifold, and an oil cooler arranged below the intake manifold and between the engine and the oil filter. The oil cooler includes a casing and a cooler body disposed inside the casing, and the casing is formed with a cooling water flowing-in union and a cooling water flowing-out union disposed in correspondence with the cooling water flowing-in union.

Abstract: A method of operating an internal combustion engine under high charge dilution conditions using a hydrogen-rich fuel is disclosed. The high charge dilution conditions are attained by diluting the hydrogen-rich fuel with gases such as excess air or recycled exhaust gas. The mixture to be charged to the combustion chamber is thoroughly mixed before it is introduced into the combustion chamber while the combustion chamber maintains a substantially quiescent state such that the charge mixture is introduced with an angular momentum lower than that of a typical low emission engine. The result is an internal combustion engine with both high efficiency and low emissions, particularly, low NOx emissions.

Abstract: The present invention discloses a crankcase scavenging internal combustion engine (1) having a transfer passage (8) interconnecting the crankcase (3) and the cylinder (2) via a conventional transfer port (20). An air supply tube (16) is connected to the transfer passage (8) via a reed valve (17). The transfer passage has a volume which is an appreciable percentage of the swept volume of the cylinder. When the crankcase is depressurized, air enters via the reed valve (17) and scavenges the transfer passage (8). When the crankcase is pressurized and the transfer port opens, the air remaining in the transfer passage which is substantially free of fuel is used to scavenge the cylinder. Some of this air enters the exhaust port (7) and some remains in the cylinder to form part of the combustion gases. The fuel free air remaining in the cylinder enables the quantity of oil in the gasoline/oil fuel mixture to be reduced.

Abstract: An engine intake resonator and manufacturing method is provided by a pair of molded sheets mated to each other along a plane and defining a plurality of tubular channels therebetween and having different length for attenuation of different frequencies.

Abstract: An air intake channel system for internal combustion engines is provided. The system includes several air intake channels each of which is formed by at least a first and a second channel member. A common channel member is allocated to two of the air intake channels and includes two air inlet openings. By pivoting the common channel member, the length of the air intake channels can be jointly varied.

Abstract: A four-stroke internal combustion engine is provided that is capable of use in many power tools, including those power tools subjected to tippable applications. There is provided within an engine housing an oil reservoir and a valve chamber which independently communicate with a crank chamber. A strategically placed divider and passageway, located within the engine housing, appropriately direct lubricant within the engine housing so that the internal cavity of the engine is lubricated during use in various operating attitudes, and so that the fluid flows to and is held in the proper chambers of the engine housing during storage. There is also provided a breather arrangement for an internal combustion engine which includes a cam shaft having a hollow passageway in communication with the crank chamber and the air intake system of the engine.

Abstract: A fuel injection device mounted on a main body of an air-fuel mixture generating device including an electromagnetic driving-type fuel injection valve for injecting, at predetermined times, fuel into an air-intake passageway of an intake system of an internal combustion engine, and a collision plate operationally coupled to the fuel injection valve adapted to be disposed in the air-intake passageway for enabling the injected fuel to collide therewith.

Abstract: An intake manifold includes a manifold body and a joint. The joint is made of metal and includes an upstream-side portion and a downstream-side portion that are joined to each other. The upstream-side portion is joined to a manifold body on the upstream-side of the manifold body. The downstream-side portion is joined to the manifold on the downstream-side of the manifold.

Abstract: An air intake shutoff device is disclosed for an engine. The device includes at least two air shutoff valve assemblies. Each of these assemblies has a gate for controlling air flow into the engine. A linkage couples together the gates of each of the air shutoff valve assemblies such that closing of one gate of the at least two air shutoff valve assemblies effectuates closing of all other gates of the at least two air shutoff valve assemblies.

Abstract: An engine cooling system and method that will allow an engine cooling fan to be driven independently of the engine speed. The engine cooling fan is driven by the engine crankshaft, but includes an electronically controllable fan clutch between the fan and the crankshaft. A control module electronically controls the engagement of the fan clutch based upon engine and vehicle operating conditions. A water pump for pumping coolant through the engine cooling system may also be driven by the crankshaft of the engine, but with an electronically controlled pump clutch between the engine crankshaft and the water pump.

Abstract: In a multi cylinder internal combustion engine comprising a cylinder head internally defining exhaust passages and a converging area into which the exhaust passages converge, an upper water jacket and a lower water jacket are formed above and below the exhaust passages, and the lower water jacket has a greater volume than the upper water jacket. Thus, the cooling efficiency for the converging area can be improved by increasing the volume of the part of the water jacket adjacent to the converging area. Also, because the upper water jacket has a relatively small volume, the load on the core parts supporting the core part for defining the upper water jacket can be reduced, and the overall mechanical strength of the core can be improved. By extending the water jackets to the converging area, the cooling efficiency can be improved even further.

Abstract: A single revolution cam engine is provided, having four equidistant cams on a drive camshaft. Each cam has four equally spaced raised cam lobes. A roller bearing on a bearing pin contacts each cam and is connected to pin arms which contact compression springs, an allen cap screw is in contact with each compression spring, and a piston in a cylinder is in contact with each bearing pin. The single revolution cam engine has particular utility in connection with providing maximum engine power and performance, with power up to four times stronger than that of a conventional four-cycle engine.

Abstract: A continuously variable Helmholtz resonator for a vehicle air intake system having a vibratory input to the resonator wall to dynamically adjust the cancellation frequency for time-varying acoustical signals, and at least one of mean resonator volume control, mean resonator neck length control, and mean resonator neck diameter control whereby control of both the dynamic and the mean properties of the resonator provides a wide-tuning spectrum and facilitates canceling of time-varying acoustical signals.

Abstract: A lubrication system for two-cycle engine includes a lubricant recess formed in a wall of a crankcase. Oil that becomes deposited within the intake passageway is directed to the lubricant recess preferably by a guide groove and pools adjacently below a connecting rod endcap. As the crankshaft with attached connecting rod rotates, pooled oil is drawn into the interior of the connecting rod endcap. Preferably, oil holes are formed radially outward through the connecting rod endcap to throw collected oil around the crankcase chamber when exposed to a centrifugal force.

Abstract: In each of the soundproofed engine generators, the position at which the power generator body is coupled to the crank shaft is located at the end part on the crank shaft. In the soundproofed engine generator of the inverter type, the inverter unit is opposed to the power generator body at a position just upstream of the power generator body. Accordingly, when the inverter unit and the power generator body are removed, a continuous, long and large space for receiving the power generator body can be secured within the soundproof cover.

Abstract: The present invention provides an improved engine for aeronautical applications which includes a core engine block having a drive shaft rotatably mounted within the core engine block and a motive device for rotating the drive shaft. A propeller speed reduction unit is connected to the drive shaft for transferring power from the drive shaft to a propeller and an accessory drive gearbox is connected to the drive shaft for transferring power from the drive shaft to at least one accessory device. The accessory drive gearbox includes an accessory drive crank gear connected to the drive shaft and a drive gear intermeshing with the crank gear. Finally, at least two inter-module dampers are mounted in the engine, one each of the inter-module dampers positioned between the core engine block and the accessory drive gearbox and the core engine block and the propeller speed reduction unit to dampen and isolate vibrations.

Abstract: An internal combustion engine capable of optimizing the amount of oil in the crank chamber with a simplified structure of lubrication system, in which a U-shaped oil reservoir is formed surrounding and adjacent to a crank chamber. At least one small hole is formed on a partition wall which separates the oil reservoir and the crank chamber from each other so that the crank chamber may always communicate with the oil reservoir through the small hole. Due to a flow resistance in the small hole, a pressure Po in the oil reservoir changes following a change of pressure Pc in the crank chamber with some delay, and where the pressure difference between the oil reservoir and the crank chamber caused by a delay in the change of the pressure Po in the oil reservoir, results in the introduction of the oil in the oil reservoir into the crank chamber. It further allows excessive oil in the crank chamber to be circulated back into the oil reservoir.

Abstract: A cooling system for cooling an interbore bridge of a cylinder block of a water cooled engine, the interbore bridge having a top surface and a central region of minimum width; the cylinder block having a water jacket; the cooling system including at lest one water passage extending from the top of the interbore bridge adjacent the central region to the water jacket. A method of forming the cooling system, and a cylinder block so formed, are also disclosed.

Abstract: A cooling system comprising a cooling water circuit 3a in which cooling water of an engine 1 circulates in a radiator 5, a hot water circuit 3c in which hot water circulates in a heater core 11, an air mixing door 12 for adjusting the volume of air which passes through the heater core, a heat storage element 7 provided in a bypass passage 6 for branching hot water into the heat core from the hot water circuit, a flow path selector valve 9 for adjusting the distribution of hot water to the heat storage element and the heater core, and a control unit 14 for controlling the operation of the air mixing door and the flow path selector valve, wherein the control unit controls the flow path selector valve such that the flow rate of hot water to be distributed to the heater core becomes larger than the flow rate of hot water to be distributed to the heat storage element, in the event that the volume of air passing through the heater core is equal to or larger than a predetermined value.

Abstract: A lubrication system for an internal combustion engine includes a variable displacement oil pump supported on the engine block and connected to draw oil from the oil pan and to supply pressurized oil to various engine components. The pump defines variable displacement pumping chambers for carrying oil from an inlet to a pressurized outlet. An exemplary embodiment includes a vane pump with a feedback displacement control using pressure from the lubrication system to actuate a slide ring in the pump to control the pump output. Numerous features of the pump are disclosed.