Abstract: A water spraying system, especially for the humidification of the intake air of a piston engine to reduce nitrogen oxide emissions, said system comprising at least one nozzle (9, 10, 11, 12, 13) for spraying an aqueous liquid mist into the air intake duct (2) and means for conveying the liquid to be sprayed to the nozzle. The system comprises means for accomplishing the injection of a spray of aqueous liquid mist to at least one point in the air intake duct (2) depending on the load and/or speed of rotation and/or temperature of the engine.

Abstract: A portable engine generator has a box-shaped case defining an internal space for holding an engine and an electric generator to be driven by the engine. The case is provided with carrying handles. The portable engine generator is provided with a cooling air passage through which fresh air as cooling air flows into the internal space while the engine is in operation. An inward depressed part is formed in a front cover of the case on the side of the internal space with respect to the carrying handles. The carrying handles and the inward depressed part define the cooling air passage. The cooling air passage serves as a hand space into which human hand is inserted to grip the carrying handles.

Abstract: A system for producing one or more gases for enhancing combustion in an internal combustion engine, the engine having an intake, the system comprising: an electrolysis cell, for generating one or more combustion enhancing gases under pressure; a gas conduit, for connecting the electrolysis cell to the internal combustion engine; and a flow regulator, operatively connected between the electrolysis cell and the intake of the engine, for regulating a flow of the combustion enhancing gases to the engine.

Abstract: A compensator assembly for a motorcycle engine including a hub and a compensator coupled to the engine crankshaft. The compensator is axially moveable along the crankshaft axis and a sprocket is supported for rotation with respect to the crankshaft. Cam surfaces on the compensator and the sprocket cooperate to transfer engine torque from the crankshaft to the sprocket. A spring biases the compensator into engagement with the sprocket and a resilient member is positioned between the hub and the compensator to resiliently limit axial movement of the compensator toward the hub. Torque pulses from the engine are damped by allowing relative rotation between the sprocket and the crankshaft.

Abstract: An integrated engine compartment component for housing vehicle support system components in a vehicle engine compartment, which is divided by shared partition walls into a plurality of vehicle support system component-containing sections, each either forming or containing a component of a vehicle support system. In one embodiment, the integrated engine compartment component includes an air intake system filtration section containing a filter element, an air intake acoustic resonator section in two-way communication with an outlet of the air filtration section, and a washer fluid reservoir section feeding a windshield or headlight washer nozzle. An acoustic chamber may be integrated into the component outer surface, e.g., to use vehicle fluids stored therein to dampen noise and to provide additional fluid working volume.

Abstract: According to the invention, an assembly includes at least one piston assembly (4105), a rotating member (4130), and a transition arm (4110). The transition arm couples the piston assembly (4105) to the rotating member (4130). The assembly includes an overload protection mechanism (4135) coupled to the transition arm (4110) and configured to reduce piston stroke of the piston assembly (4105) upon application of an overload to the assembly while enabling the rotating member (4130), e.g., an input drive and/or a flywheel, to continue rotating. The overload protection mechanism (4135) is configured to reduce piston stroke of the piston assembly to zero stroke while enabling the rotating member (4130) to continue rotating at a substantially pre-overload speed. A method of protecting an assembly from an overload includes reducing piston stroke upon application of an overload to the assembly while enabling the rotating member (4130) to continue rotating at a substantially pre-overload speed.

Abstract: A suspension system for a motor of a combustion-powered hand tool includes a motor retaining ring defining a space for accepting the motor, an outer ring radially spaced from the retaining ring and configured for attachment to a cylinder head of a combustion chamber, and at least one resilient suspension element configured for dampening vibrations between a motor support and a tool frame, and having a plurality of resilient beams connecting the retaining ring and the outer ring.

Abstract: An on/off clutch assembly is disclosed having a two component spring end cap. The spring end cap includes a steel cap portion and a non-metallic portion. The non-metallic portion extends along the entire length of the steel cap portion and is located between the steel cap portion and the piston rod. The new design insulates the steel piston rod from the steel spring end cap. This results in reduced corrosion of seals within the clutch assembly and contributes to improved conditions for bearings within the clutch assembly.

Abstract: An engine has a flywheel magneto mounted on one end of a crankshaft. The flywheel magneto rotates together with the crankshaft. A cover member is coupled with an engine body and defines a space together with the engine body. The flywheel magneto is enclosed within the space. The space contains lubricant and/or lubricant mist that can adhere onto the flywheel magneto. The cover member defines first ribs that extend toward the flywheel magneto and that are closed spaced from the flywheel magneto so as to remove lubricant adhered on the flywheel magneto when the flywheel magneto rotates. The cover member also defines second ribs extending toward the flywheel magneto and an lubricant collecting recess formed on an inner surface of the cover member. The second ribs also remove lubricant adhered on the flywheel magneto and guide the lubricant toward the lubricant collecting recess when the flywheel magneto rotates.

Abstract: A radial engine includes an engine block (2) having a central aperture (14). A drive shaft (7) extends through the aperture and a planar cam plate (5,6) is fixedly mounted on the shaft. A pair of spaced opposed walls (25) extend from the surface of the plate. A reciprocatable piston (37) is slidably mounted within a cylinder (9). A cam follower is engaged with at least one of the walls (25), such that reciprocation of the piston (37) rotates the plate (5,6) and the shaft (7).

Abstract: A head gasket (48) which acts, when clamped between a cylinder head (28) and a block (22) in a liquid cooled internal combustion engine (20), to form a seal around the combustion chambers (24). A coolant flow path (32) routes through the engine (20) and its directed, in part, through the cylinder head (28) and the block (22), with a corresponding flow opening (54) formed in the head gasket (48) to accommodate flow of liquid coolant in a normal direction. The head gasket (48) includes a one-way valve (58) positioned in the flow opening (54) to allow the flow of coolant in a normal direction but to prevent the flow of liquid coolant through the flow opening (54) in an abnormal, reverse direction. The one-way valve (58) includes movable gate (66) which may be biased against a valve seat (64) in a normally closed condition. The one-way valve (58) can be made as a loose piece article of manufacture which is held in flow opening (54) by self-locking retention clips.

Abstract: The present invention provides a means for momentarily reducing cooling fan load on an engine when a machine encounters sudden loads. The system includes an engine, a load driven by the engine, a cooling system associated with the machine, and one or more controllable cooling fans for delivering air to the cooling system. A controller continually monitors engine speed, reducing fan load when engine speed is both decreasing faster than a maximum rate and is lower than the desired speed. The controller then re-engages the fan load when engine speed is approximately equal to the desired speed or when a maximum disengagement time has elapsed.

Abstract: A V-quad engine has two juxtaposed V-twin cylinder banks connected to a common crankshaft and fuel and ignition systems that cause the front cylinders in the two banks to fire simultaneously and the rear cylinders in the two banks to fire simultaneously. Conventional V-twin components are used for many components of the V-quad engine. Master-slave rocker shaft assemblies are provided with angularly adjustable links to drive the left bank rocker shafts in unison with the right bank rocker shafts.

Abstract: The oil pan includes an oil introducing portion that has an oil introducing plate. The oil introducing plate has an insertion hole for receiving a sucking portion of an oil strainer. The oil introducing plate extends from the periphery of the insertion hole toward a side wall of the oil pan. The oil returned from the first oil return passage is introduced to flow along the oil introducing plate via an oil falling hole formed in a baffle plate that is positioned at the bottom of a crank case of the internal combustion engine. The oil introducing portion further includes a plurality of inclined wall portions mounted on a bottom portion of the oil pan in the vicinity of the side wall of the oil pan in order to support the oil introducing plate. Opening portions are formed between the inclined wall portions and the bottom portion of the oil pan. The oil introducing plate of the oil introducing portion is located just below the oil falling hole formed in said baffle plate.

Abstract: An engine air intake device comprises a collector divided by a partition wall into first and second volume chambers, first and second upstream intake pipe portions, a plurality of first and second downstream branch pipes, and a first communication valve. The first and second upstream intake pipe portions are connected to an upstream side of the first and second volume chambers, respectively. The first and second downstream branch pipes extend from the first and second volume chambers, respectively, to respective intake ports of first and second banks of first and second cylinders, respectively. The first communication valve is mounted to the partition wall in a position that does not interfere with a path of a main flow of intake air inside the collector and configured and arranged to allow communication between the first volume chamber and the second volume chamber when the first communication valve is open.

Abstract: A construction machine includes an engine guard, an engine, a cooling fan, and a device for being cooled by the cooling fan, and an exhaust duct. The engine guard accommodates the engine and has intake and exhaust openings. The intake opening and the exhaust opening are disposed in different side covers. The side covers correspond to the left and right side walls of the engine guard. The engine, the cooling fan, and the device are accommodated in the engine guard. The exhaust duct is disposed above and behind the engine, parallel with the flow of a fan air which has been used for cooling the engine, and substantially horizontally. The exhaust duct has an exit connected to the exhaust opening. The fan air introduced from the intake opening flows substantially linearly along the cooling fan, the engine, and the exhaust duct and is discharged from the exhaust opening.

Abstract: This invention describes a method which can be used to improve the output torque and resulting horsepower of internal combustion engines while lowering the overall pollution experienced with these engines. This invention will allow smaller displacement engines to be used in transportation vehicles without sacrifice of driveability. In some applications existing high horsepower engines can be boosted to even higher output levels. This invention describes an on board system that separates nitrogen (N2) from air leaving an oxygen (O2) enriched air that is used in combination with fuel to improve operation of the engine during its various modes of operation (start-up, acceleration, cruise, deceleration and idle).

Abstract: Chaotic air flow structures in internal combustion engine manifolds may lead to poor combustion performance and hence undesirable emissions such as visible smoke. Manifolds with flow characteristics compromised by other design requirements are especially prone to these poor characteristics. To overcome these, an engine air induction arrangement includes a feed passage having an end portion in a manifold with cylinder ports. The end portion is formed in such a manner that air exiting the end portion via an opening is hindered from travelling away from the cylinder ports. This improves the flow structure and evens air distribution to the cylinder ports, hence improving the combustion process and reducing emission levels.

Abstract: A water-cooled cylinder head is provided for a multicylinder internal-combustion engine having two inlet and outlet valves per cylinder. The cylinder head has a cylinder head cooling space with inflow and outflow openings for the coolant which is integrated in the cylinder head housing and extends above a part-spherical cap forming a combustion chamber volume. Water cooling spaces are formed at least in areas around a receiving opening for a spark plug arranged centrally in the cylinder head housing and around the two outlet valves. The water cooling spaces are mutually connected by way of a common annulus section. At least the common water cooling jacket annulus section has a volume which remains an essentially constant distance from the combustion chamber volume, so that, at least in this area, the wall thickness of the part-spherical combustion chamber cap extends in a uniform manner and to close to the combustion chamber volume.

Abstract: In an insulator (21) inserted between a carburetor (30) and a cylinder (3) for a purpose of insulating heat, there are formed an intake passage (22) connected to the carburetor (30), and a pair of first air passages (23) connected to respective air flow paths (14) communicated with a pair of scavenging ports (10) formed in the cylinder (3). Air control valves (25) are respectively provided within a pair of first protruding portions (33) communicating with an air cleaner (32), and are connected to the pair of first air passages (23) via a pair of connection members (35). Portions from the air passages within the pair of first protruding portions (33) to the pair of first air passages (23) are respectively formed as smooth air passages in which a change of an inner diameter cross sectional area in a connection portion is small.