Abstract: An air intake manifold for use with an internal combustion engine is provided with a labyrinth configuration in order to reduce the amount of space consumed by the manifold. The manifold is preferably made from a plastic material for reducing the weight of the manifold and for providing an inexpensive and relatively simple molding process.

Abstract: A diesel engine emergency shutoff device for use on a regularly aspirated or turbocharged diesel engine. The device is mounted between on the engine's air intake tube and utilizes a closure valve biased to the open position by biasing means and actuated to the closed position by engine vacuum.

Abstract: An intake manifold system 10 is described for a multi-cylinder four stroke spark-ignition internal combustion engine 12. Each cylinder has at least one intake port 20, each intake port 20 being connected at one end to the combustion chamber by at least one intake valve 14 and at the other end to a first intake duct 22 that is connected to a first plenum 24 common to the first intake ducts 22 of other engine cylinders. Each intake port 20 is also supplied by a second intake duct 32 the through flow cross-section of which is at least 15% of the maximum effective through flow cross-section of the open intake valve and controlled by a variable throttle 40, the second.

Abstract: An oil pan has a partition for regulating the transverse movement of oil and baffle plates for regulating the vertical movement of oil. The oil pan is divided into an oil pan upper portion and an oil pan lower portion, the oil pan upper portion is formed with a lower portion attaching face on the lower face of an upper-side bottom, a partition for partitioning the oil level is formed by raising a part of the upper-side bottom surrounded by the lower portion attaching face, a first oil chamber is provided on one side of the partition and a second oil chamber is provided on the other side of the partition, attaching bosses are formed at the upper part of the partition to install an upper portion baffle plate, and air holes are formed at the upper part of the partition close to the attaching bosses to provide communication between the first oil chamber and the second oil chamber.

Abstract: A V-type engine for automotive or vehicular application, wherein a single plenum chamber serves all intake passages of the engine. The single plenum chamber has a triangular configuration and is disposed above one of the cylinder heads with its lower surface extending parallel to the upper surface of the cylinder head and spaced closely adjacent thereto. The runners for the individual cylinder banks have substantially the same length and include flexible couplings therein.

Abstract: The invention joins the intake module or intake tube to the engine with the aid of a displaceable retaining element. The retaining element, which in the mounted state is under initial tension, is braced against an engine retention face associated with the engine and against at least one counterpart intake module retention face joined to the intake module or intake tube. Because of the displaceability of the retaining element, the expense and effort of mounting and dismantling the intake module or intake tube to the engine by screws are substantially reduced. The engine is intended in particular for motor vehicles.

Abstract: A piston internal combustion engine includes an engine block made of a base material and including a cylinder block having walls. Segmented, rib shaped reinforcements are disposed on the engine block, each reinforcement defining breaks along a course thereof, the reinforcements further being made of a material having a higher modulus of elasticity than the base material.

Abstract: A piston cooling nozzle for an internal combustion engine includes a two-part construction comprising a mounting base and a main body. The mounting base includes a substantially flat end panel which is designed to attach directly to a plateau area on the engine block. The mounting base also includes a plug portion which is designed to seal closed an open end of the main body. The main body includes a through hole which is located in communication with an engine oil rifle. The main body represents a single piece component with an extension arm and cooling nozzle head. The extension arm includes a plurality of drilled passageways which are in communication with four flow jet apertures in the cooling nozzle head. The cooling nozzle head has a generally triangular shape and the four flow jet apertures are arranged so as to track the arc-like curvature of the corresponding piston cooling gallery.

Abstract: The present invention relates to a crank system for the transformation of reciprocating linear motion into rotary motion, particularly suitable for reciprocating endothermic engines, comprising a wheel or rotating connection rod (2), idly provided on the engine piston (5) pin (3), and a cam (1), provided on the output shaft (6), having a perimetric profile made up of at least two segments or cam arches for the optimisation of the engine cycle strokes, said wheel (2) rotating along the profile of said cam (1) with a coupling characterized by the absence of friction or by a minimum friction.

Abstract: A firing system for a multi-cylinder internal combustion engine propagates combustion between cylinders by the use of a valve located between an outlet port of one chamber and an inlet port of a second cylinder.

Abstract: The invention relates to an internal combustion engine for a portable handheld work apparatus such as a motor-driven chain saw or the like. The internal combustion engine includes a cylinder defining a combustion chamber and having an inlet passage for conducting a fuel mixture into the combustion chamber. The cylinder has an annular flange formed thereon and is disposed in surrounding relationship to the inlet passage. An intake pipe defines a longitudinal axis and has an end section. The end section and the annular flange are axially inserted one into the other in overlapping relationship to each other. The annular flange and the end section conjointly define an annular space therebetween radially of the longitudinal axis and a seal is clamped between the annular flange and the end section in the annular space.

Abstract: A two-cycle internal combustion engine is provided which is capable of preventing the blow-by phenomenon, thereby improving both fuel economy and exhaust purifying performance, and superior in the response of fuel injection volume. In a two-cycle internal combustion engine wherein a chamber is disposed in scavenging passages which provide communication between a crank chamber and a combustion chamber, sealable control valves are disposed in an inlet and an outlet, respectively, of the chamber. A fuel feeding system is provided for the supply of fuel into the chamber. The chamber is brought into communication with one scavenging passage out of a plurality of parallel scavenging passages. The control valve, disposed in the chamber outlet which is on the combustion chamber side and on a scavenging downstream side, is positioned at the bottom part of the scavenging passage communicating with the chamber with respect to the control valve disposed in the chamber inlet which is on the crank chamber side.

Abstract: An induction system for a multicylinder internal combustion engine includes a log for receiving air drawn into the engine and individual runners extending from the log to intake ports of the engine. An antireversion air manifold supplied with air by the log has flow control valves and branches extending between a main passage of the antireversion air manifold and the individual intake manifold runners, with the branches connecting with the runners at positions situated between individual throttle plates and intake valves.

Abstract: A four-stroke cycle, multi-cylinder reciprocating internal combustion engine has a camshaft phaser or phasers for adjusting the timing of the intake and exhaust camshafts with respect to the rotational position of the crankshaft so that some of the cylinders of the engine may be deactivated such that the intake and exhaust valves for each deactivated cylinder open and close at points which are approximately symmetrical about a rotational position of the crankshaft at which the direction of motion of the pistons change.

Abstract: An engine including an assembly of at least two cylinders with different displacements and two crankshafts coupled at the same rotational speed via a gear train and a variably timed transmission having three concentric shafts separable from the drive assembly and designed to reduce the compression ratio as the intake pressure increases. The maximum and minimum compression ratios are set within the angular displacement limits between the two cylinders, and between said two cylinders and the clearance space, so that (a) the start of the variably time transmission stroke increases the translation of the piston by units of angular displacement between the two crankshafts at the end of compression phase, and (b) the end of the variably time transmission stroke combines combustion gas expansion on the piston at least from the maximum torque on the crank of the short-stroke crankshaft.

Abstract: An opposed piston internal combustion engine includes a rotary shaft provided with a first and second swash plate, each inlined relative the axis of the shaft at equal but opposite inclinations. The shaft is mounted for rotation in a frame on which at least one cylinder is fixed in parallel alignment. A first set of pistons on the ends of a tubular post is fitted in the cylinder with a central rod extending coaxially through the post and the first piston set. A second set of pistons is then fixed to the ends of the rod. Both the rod and the post engage the respective swash plate peripheries, and are thus reciprocated in opposition as the shaft is turned. In this manner the gas mixture between the piston sets at one end is compressed while the mixture at the other end is ignited.

Abstract: An intake manifold assembly (12) for an internal combustion engine (16) which can vary the intake geometry of the air flowing therethrough. The intake manifold assembly (12) includes a pair of secondary runners (28), one for each bank of cylinders, with each of the secondary runners (28) able to selectively communicate with a small plenum (44) at its end or a large plenum (36) intermediate its ends. The intake manifold assembly (12) also includes a set of primary runners (46) able to selectively communicate with the small plenums (44) at their upstream ends or the large plenums (36) intermediate their ends. The airflow is switchable through the actuation of upper runner control valves (40) and lower runner control valves (50) to thereby vary the tuning of the intake manifold to improve the overall torque and horsepower output of the engine.

Abstract: An internal combustion engine of either two-cycle or four-cycle construction including a block having at least one cylinder bore therein having sidewalls carrying a liner of a structural fiber reinforced ceramic matrix composite material disposed in sealed fiber reinforced sliding relationship within the cylinder bore, and a cylinder head sealing atop end of the cylinder bore to form a closed combustion chamber in combination with the piston. The cylinder head also has the structural fiber reinforced ceramic matrix composite material disposed on an inner surface thereof facing the combustion chamber. The preferred engine is a two-cycle engine having an externally scavenged intake system and an oil sump lubricating system thereby eliminating the need to separately mix or inject lubricating oil. Higher operating temperatures and closer tolerances allow higher fuel efficiency and less pollutant production.

Abstract: A pressurization system for controlling actuation of flow control valves in a temperature control system is disclosed. The pressurization system includes a housing which has a chamber formed in it. An input injector is in communication with the housing and is adapted to channel a flow of pressurized fluid into the chamber. An output injector is also in communication with the housing and is adapted to channel a flow of pressurized fluid out of the chamber. Fluid flow control means is connected to the housing and has at least one fluid outlet. The fluid outlet is adapted to direct a flow of pressurized fluid to a flow control valve to control actuation of the valve. The fluid flow control means has an open position for allowing a flow of pressurized fluid out of the fluid outlet and a closed position for preventing fluid flow out of the fluid outlet.

Abstract: In a variable cylinder-operation controlled internal combustion engine in which the operation of one or more of the cylinders can be stopped, valve operation and stoppage switchover devices are provided in the cylinders, respectively, that are capable of independently switching the operation and stoppage of the engine valves in every cylinders. The operation of the valve operation and stoppage switchover device is controlled by a control unit, so that the operation and stoppage of the engine valves in all the cylinders are repeated according to previously established engine valve operation and stoppage modes when the engine is in a cylinder operation-stopped operational state. Thus, it is possible to prevent one or more of the cylinders from being brought into an incompletely warmed state for operation when the engine is restored to the all cylinder-operated state after continuation of the cylinder-stopped operation state over a long time.