Abstract: A dual drive radiator fan and coolant pump system for a liquid-cooled reciprocating internal combustion engine includes a coolant pump with an impeller shaft driven by a first drive extending between the engine's crankshaft and a pump pulley and hub mounted upon the impeller shaft. A second drive extends between the crankshaft and a fan hub journaled upon the pump hub, so that the coolant pump and fan hub are driven independently.

Abstract: A clamp (26) has a main body (30) that is attached to an engine block (28). A right-angled flange (32) extends from the main body to enter a downwardly open concave interior of an outturned flange (18) of an oil pan rim (16) and provides underlying support for an insert (46) on which the outturned flange of the oil pan rim rests. Fretting of the rim is avoided because the presence of the insert avoids any substantial contact between the flange (32) and the rim (16) that could lead to fretting.

Abstract: A combustion nailer configured for reducing intake of contaminated air during operation, includes a combustion engine having a cylinder with a piston reciprocating between a prefiring position and a fully extended position, and at least one air port in the cylinder below the fully extended position. The at least one air port is provided with a venting check valve configured so that the discharge volume from the cylinder out the at least one air port is greater than the inflow.

Abstract: A fuel selection device is provided for allowing a user to connect the cylinders of an internal combustion engine to a user-selected fuel source. The fuel selection device includes a housing that defines a cavity for receiving a moveable selector therein. The selector defining first, second, third and fourth flow paths. The first and second flow paths are used for flowing a first type (e.g., natural gas) of fuel from a fuel source to the cylinders of the engine. The second and fourth flow paths are used for flowing a second type of fuel (e.g., liquid propane vapor) from a fuel source to the cylinder. The selector is movable between a first position wherein first and second cylinders communicate with the first and second flow paths, respectively, and a second position wherein the first and second cylinders communicate with the second flow path and fourth flow paths, respectively.

Abstract: To provide a power unit capable of contributing to simplifying the procedure for fitting the electric motor for speed change use and the starter motor to shorten the motor wiring to facilitate the wiring and for concentrating the mass. A power unit includes a unit case which is journaled in a front part to a pivot shaft and a belt-driven continuously variable transmission is provided together with an internal combustion engine. An electric motor for transmission and a starter motor are provided together and supported by the unit case. The electric motor and the transmission are arranged to be adjoining each other on the same side as the pivot shaft in a side view. The electric motor for transmission is arranged in a position closer to the pivot shaft than the starter motor.

Abstract: An engine system comprising a secondary fuel source for providing a secondary fuel, a metering valve for delivering the secondary fuel at a substantially pre-determined rate, an air intake, and an internal combustion engine. The metering valve comprises a valve body and a selectively-adjustable static valve mechanism. The valve body is provided with a fuel inlet in fluid communication with the secondary fuel source to receive the secondary fuel from the secondary fuel source, a fuel outlet, and a fuel passage between the fuel inlet and the fuel outlet. The selectively-adjustable static valve mechanism is disposed within the fuel passage of the valve body. The air intake is in fluid communication with the fuel outlet of the metering valve to receive the secondary fuel from the metering valve to permit the secondary fuel to mix with air.

Abstract: A power unit for a vehicle comprises an engine and a transmission assembly. The engine includes a crank shaft having a rotating mass. The transmission assembly includes a drive shaft having a first drive gear and being connected to the crank shaft through a first transmission mechanism, and a driven shaft connected to the drive shaft through a driven gear that meshes with the first drive gear. With the power unit oriented such that the crank shaft is substantially horizontal, at least a portion of the transmission assembly is positioned within a region extending below a swept area of the rotating mass.

Abstract: A pressure spike modulator for engagement to the cylinders of an internal combustion engine. The device provides for adjustment of engine cylinder pressures using a reciprocating piston which provides a temporary increase in engine combustion chamber volume. Pressure from combustion chamber gases is communicated by the device back into the combustion chamber during the downstroke of the engine piston. Engine compression and peak combustion pressure may be modulated by adjusting pressure supplied to the device to resist incoming engine gases. Fuels for the attached engine may thereby be varied or substituted by adjusting the engine peak pressure and compression to one adequate for the chosen fuel.

Abstract: An intake system of an internal combustion engine includes an engine head, a resin made intake manifold mounted at the engine head and having intake passages, the resin made intake manifold forming a receiving portion on an inner wall of each intake passage at a downstream side, and a control unit disposed at the receiving portion and including a resin made cartridge, an opening and closing valve disposed at the cartridge, and a shaft rotating the valve, wherein a clearance is provided between an inner circumferential surface of the receiving portion and an outer circumferential surface of the cartridge to allow deformation of the resin made intake manifold, and the cartridge is provided with a flange held between the engine head and the resin made intake manifold.

Abstract: A power plant, including an internal combustion engine, a fuel conversion device that coverts a fuel to be supplied to the internal combustion engine from a before-conversion fuel to an after-conversion fuel, a first fuel supply device that supplies the fuel conversion device with the before-conversion fuel, a second fuel supply device that supplies the internal combustion engine with the after-conversion fuel, the after-conversion fuel being the fuel that has been converted by the fuel conversion device, and a controller that is communicated with the internal combustion engine, the fuel conversion device, the first fuel supply device and the second fuel supply device.

Abstract: A synchronized, dual crankshaft engine (10) uses a phase-shifting device (42) to alter the angular position of one crankshaft (12) relative to the other crankshaft (14) for dynamically varying the engine's developed compression ratio. Each crankshaft (12, 14) drives a respective connecting rod (16, 18) which, in turn, reciprocates a piston (24, 26) in a cylinder (28, 30). The center lines (C, D) of each cylinder (28, 30) are skewed relative to each other so that the pistons (24, 26) converge toward a common combustion chamber formed under a common cylinder head (34). Movable exhaust valves (36) are located above the piston (24) whose phase shifted orientation is retarded or lagging dead center conditions, whereas movable intake valves (38) are located above the piston (26) that is leading or advanced in its phase displacement relative to dead center conditions.

Abstract: The invention relates to a vehicle engine system. The engine system includes an internal combustion engine, a cooler of a cooling circuit, an electric generator driven by the engine from a side of the engine which is other than that which faces the cooler, and a fan for moving air through the cooler, all disposed in an engine compartment. An electric motor is powered by the generator and mechanically drives the fan through an output shaft which is mechanically connected to the fan. The output shaft of the motor is disposed in the engine compartment near a mechanical power take-off of the engine. The mechanical power take-off includes a belt pulley connected to a free end of an engine crankshaft.

Abstract: A two-stroke opposite rotary-piston engine comprises a cylinder block including a sleeve and two pistons slidely disposed therein, oppositely movable forming a common combustion chamber and a first gap with sleeve's sidewalls, a rotor having a surface formed by an ellipse or Cassini line, traverses attached to the pistons, rollers attached to the traverses and springly depressed against the rotor, oil tubes with end bushings, oil supply and withdraw means, two plungers disposed in each tube forming a second gap essentially less than the first. The plungers are attached to the traverses and oppositely movable, including through channels, outward surfaces with the bushings forming external spaces, and inward surfaces with the tube sidewalls forming an internal space communicating with the oil supply and withdraw means. Oil drain means communicate the external spaces with the oil supply means. The engine absorbs side and inertial forces, is more efficient and clean.

Abstract: An internal combustion engine wherein a combustion chamber is formed by moveably fitting a bottomed tubular moveable sleeve on a stationary piston in which a valve mechanism is incorporated, and the moveable sleeve is connected to a crankshaft via a connecting rod.

Abstract: An engine front structure, which is provided with a cover body (9a) of the timing cover (9) which covers the camshaft driving force transmission mechanism at a position opposed to a front surface of the cylinder head. An upper extension portion (9b) of the timing cover (9) extends upwardly from an upper portion of the cover body (9a) and has an inner surface formed with a depression (12, 13) receiving therein the variable camshaft timing mechanism (7, 8). A fastening seat (14) on the cover body (9a) with a relatively high stiffness is located beneath of the upper extension portion (9b) and centrally in a width direction of the engine and is fastened to the engine body. An engine-mounting-bracket receiving seat (16) is formed on a top surface of the upper extension portion (9b) to have a relatively high stiffness and attached to an engine mounting bracket.

Abstract: In an internal combustion engine, an actuator for driving a control shaft of a variable valve-operating mechanism is disposed in a space surrounded by a cylinder head having a plurality of intake ports, an intake manifold having a plurality of branch pipes connected to the intake ports, and a throttle body disposed at one end in a direction of arrangement of the branch pipes. Thus, the actuator can be disposed by effectively utilizing such an unused space surrounded by the cylinder head, the intake manifold and the throttle body, thereby reducing the entire length and the entire height of the internal combustion engine including the actuator.

Abstract: Upper and lower split components include upper and lower concave parts, respectively, forming the inner periphery of an intake pipe. An internal pipe is placed between the upper and lower concave parts. The upper concave part is formed a distance away from the outer periphery of the internal pipe. The outer periphery of the internal pipe is provided with a fitting part fitted into the lower concave part and a sealing part accommodated in an accommodation recess formed in the upper concave part. The inner face of the accommodation recess and the sealing part are formed along the direction of vibration of vibration welding and are in contact with each other.

Abstract: To provide a pump drive structure for a water-cooled internal combustion engine in which the number of revolving shafts arranged in parallel in an internal combustion engine is reduced and a power transmission mechanism is eliminated. Thus, the internal combustion engine is downsized. The pump drive structure of a water-cooled internal combustion engine is provided in which a balancer shaft is arranged in parallel with a crankshaft at a position where crank webs of the crankshaft and balancer weights are overlapped in the axial direction. An oil pump drive shaft of an oil pump is connected coaxially at one end of the balancer shaft, and a water pump drive shaft of a water pump is connected coaxially with the other end of the balancer shaft.

Abstract: The present invention relates to an internal-combustion engine comprising at least one cylinder (10) in which a piston (14) slides between a top dead center (TDC) and a bottom dead center (BDC) under the action of a connecting rod (20) of axis XX and a crankshaft (38) controlling the displacement of the piston under the effect of an articulated linking system (26) allowing variation of the engine displacement and/or compression ratio. The articulated linking system comprises a shift lever (26) mounted to pivot around an articulation axle (46) and is displaceable in translation in at least one direction by displacement control means (52, 52V). The shift lever comprises a porthole (44) within which the axle is housed and is connected by one (24) of its ends to the connecting rod and by the other (28) end to a link (32) connected to the crankshaft. Shift lever (26) comprises a slider (78) carrying articulation axle (46) and cooperating with opening (44) of the lever.

Abstract: A two-stroke internal combustion engine is disclosed having opposed cylinders, each cylinder having a pair of opposed pistons, with all the pistons connected to a common central crankshaft. The inboard pistons of each cylinder are connected to the crankshaft with pushrods and the outboard pistons are connected to the crankshaft with pullrods. Each opposed cylinder further comprises an integrated scavenge pump for providing positive intake pressure. This configuration results in a compact engine with a very low profile, in which the free mass forces can be substantially balanced. The engine configuration also allows for asymmetrical timing of the intake and exhaust ports through angular positioning of the journals on the crankshaft.