Abstract: A reciprocating piston-type internal combustion engine is equipped with a variable length connecting rod which is operable in response to engine oil pump pressures to cause a low throttle fuel charge to be compressed in the engine cylinder to substantially the same pressure as an open throttle fuel charge. An adjustable pressure regulator valve is provided to insure a substantially constant oil pressure at the connecting rod at all times during operation of the engine.

Abstract: An internal combustion engine having a noise suppressing encapsulation, said encapsulation being ventilated by a blower and cooling air ducts being formed within the encapsulation by means of partitions, one of said cooling air ducts comprising all fuel and oil leading engine parts and the other cooling air duct being imperviously divided from the first one comprising the parts of the exhaust system.

Abstract: A valve drive device for an internal combustion engine characterized in a movably pivoted rocker arm, at either a cam-contacting part or a valve stem-contacting part thereof, having installed therein a built-in oil pressure tappet for automatically absorbing a gap created at such contacting part. Between the oil pressure tappet and the cam or the valve stem, in contact with the oil pressure tappet, a movable plate is provided, having a curved surface where the movable plate and/or the oil pressure tappet contact each other, thereby lubricating the contacting part to prevent its abrasion.

Abstract: In a two-stroke, water-cooled internal combustion engine the improvement is disclosed which permits to have a removable cylinder liner type of engine in spite of the intricate constructional arrangement of such engines having transfer ports and exhaust ports. The improvement consists in that the transfer and exhaust ports are formed through the liners and flanged fittings are provided between the liner transfer ports and the transfer ducts so as to ensure complete tightness. Differential-firmness gaskets are provided where appropriate and the engine is then assembled by stay bolts as usual. The construction suggested by the invention not only solves the tightness problem satisfactorily, but minimizes the stresses on the liners, especially the bending stresses.

Abstract: A self-contained hydraulic lash adjuster, which does not depend upon any external source of hydraulic fluid in operation, is used in the valve trains of internal combustion engines in order to take up the lash or operating clearance in the valve trains. The lash adjuster comprises a cylinder member, a plunger member slidably fitted therein, said cylinder and plunger members defining a fluid pressure chamber between each end wall thereof, said plunger member forming a reservoir chamber therewithin, and an elastic bag member disposed within the reservoir chamber, the inner wall surface of said elastic bag member being normally in communication with atmospheric pressure while the outer wall surface thereof being normally in contact with the fluid in the reservoir chamber.

Abstract: A cooling system adapted for a liquid-cooled type of two-cycle multicylinder engine. The thick-walled portion of a crank case between adjacent cylinders is provided with a cooling-liquid passage. The delivery port of a liquid pump is fixedly secured to one end of the cooling-water passage at the intake side of the cylinder, while the other end of the passge at the exhaust side of the cylinders is flow connected to liquid jackets in the cylinder blocks.

Abstract: This disclosure relates to improvements in hydraulic dashpot chain tensioners for the timing chains of motor vehicles. A kit for modifying existing chain tensioners is disclosed which can be readily connected to a chain tensioner to eliminate leakage of air into the dashpot. The kit comprises an open, cup-like oil reservoir adapted to be sealingly secured to the chain tensioner in fluid communication with the dashpot. Baffles are arranged adjacent the open end of the cup member to prevent loss of oil therefrom by reason of centrifugal forces acting on the oil.

Abstract: An internal combustion engine comprising a primary combustion chamber, a secondary combustion chamber communicated with the primary combustion chamber through a passage, a spark plug with electrodes extended in said passage, and means for preventing the electrodes from being directly exposed to the burnt gas injected into the primary combustion chamber from the secondary combustion chamber through the passage.

Abstract: A ventilation system for an encapsulated internal combustion engine providing a reduction in short-circuit air flow from the pressure side to the suction side of the ventilation radial fan.

Abstract: An engine valve operating mechanism for operating the poppet valves controlling the intake and exhaust ports of each cylinder independently of each other and independently of the crank shaft speed. The mechanism includes an extendable and retractable fluid actuator having first and second members telescopically engaged with each other, one of which members is rotatable with respect to the other. An expansible and contractable fluid chamber is defined between the members, and the flow of fluid into and out of the chamber is controlled in accordance with the angular position of the members with respect to each other. When fluid flows into the chamber, the chamber expands causing the actuator to extend. When fluid is exhausted from the chamber, the actuator contracts. The actuator is mounted on a support member and engages a poppet valve operator to cause a poppet valve engaged by the operator to move in opening and closing directions in response to extension and retraction of the actuator.

Abstract: A power driven valve stroke adjusting device, remotely controlled, is operable for adjusting the length of stroke of a spring returned poppet valve of a valve-in-head internal combustion engine in which the valve is driven by an associated valve operating rocker on the head, operated by a push rod which, in turn, is driven by a tappet which is lineally reciprocable axially and concurrently rotatable about its axis. The device is carried on the rocker and is operable to adjust the valve stroke for opening the valve by the rocker from starting position of the valve to a long-stroke open position or to a short-stroke open position, selectively. The adjustment is effected during engine operation and without any hindrance to tappet rotation and without any change in the timing relation between the tappet and its operating cam, all while maintaining a zero or fixed preselected clearance between the rod and the rocker and between the rod and the tappet in the starting position of the valve.

Abstract: An engine valve comprises an elongated stem having a head secured on an end thereof. A tube is disposed in the stem to terminate at an outlet to communicate a liquid coolant, such as oil, to an annular chamber defined in the head. An agitator ring is loosely mounted in the chamber for moving therein during valve operation. A plurality of circumferentially disposed and radially extending ribs are preferably secured between the head and a cap secured thereon to define a plurality of inlet and outlet passageways therebetween.

Abstract: A water-cooled internal combustion engine for motor vehicles, particularly a diesel engine, with a cooling system comprising two separate cooling units, each of them consisting of a radiator and a fan, the first cooling unit being arranged forwardly of the engine receiving drive from the engine by mechanical transmission means, the fan of the second cooling unit receiving drive from the engine itself via transmission means, the first cooling unit dissipating at least 60% of maximum heat output and the second unit coming into action additionally to the first by means of temperature control.

Abstract: An improved tubular composite for transmitting substantial thrust forces has a tubular core of continuous reinforcing fibers in a resin matrix unidirectionally and longitudinally oriented. Integral with the core is a sheath of resin impregnated continuous fibers oriented at about .+-.40.degree. to about .+-.60.degree. with respect to the longitudinal axis of the core.

Abstract: A hydraulic lash adjuster includes a body having a closed end, a chamber and an open end. A hollow plunger is positioned within the body chamber and has a portion extending outwardly therefrom. A high pressure chamber is formed between the closed end of the body and the plunger and a spring is positioned within the high pressure chamber to urge the plunger outwardly from the body. There are aligned fluid passages in the body and plunger to permit oil to pass into the hollow plunger from the exterior of the body. There is an additional fluid passage in the plunger, positioned closer to the high pressure chamber than the body fluid passage, to direct oil passing from the high pressure chamber along the exterior of the plunger back into the plunger interior.

Abstract: The amount of lift of a valve lifter rocker arm is determined by a rotatably mounted valve pushrod seat having an eccentrically positioned depression for receiving the pushrod end. The seat is rotatably adjusted to one of two predetermined positions to increase or decrease the leverage ratio of the rocker arm. A screwdriver slot in the seat member permits easy adjustment without removing the rocker arm, and a set screw locks the seat member in the desired position.

Abstract: The invention provides a mushroom valve housing comprising a cage (1) and a guide (2), Cage (1) comprises legs (3, 4, 5, 6) supporting a valve seat (7) containing an annular space (8). Guide (2) has an annular cavity (9) with two sections (9a, 9b) communicating with space (8) by passages (11 to 14). One passage (12) among the two passages (11, 12) connected to a same section (9b) freely opens into this section whereas the other passage (11) communicates directly with the other section (9a), the passages (11, 13) of two diametrically opposite legs (3, 5) communicating with a same section (9a).

Abstract: An engine valve has a valve body, a valve head, an annular metallic valve seat layer fusibly bonded to the valve head that has a relatively fine crystalline structure, and a thinner region of interstitial bond between the valve head and the valve seat layer than heretofore known.

Abstract: A two-piece piston includes head and skirt sections having opposed annular recesses to define a continuous peripheral coolant chamber. A transverse coolant conveying channel communicating at opposite ends with the chamber may also be formed in the skirt section to provide cooling for the central portion of the piston crown.

Abstract: A system for varying valve timing; i.e. the rotational angle of the crankshaft during which an intake or an exhaust valve of a cylinder of a reciprocating internal combustion engine is open which results in varying valve overlap, and for varying valve lift of such intake and exhaust valves. A desmodromic cam and cam follower convert rotation of a cam shaft to reciprocating rotation, or oscillation, of the cam follower. The reciprocating rotation of the cam follower is converted by the interaction of a secondary cylindrical cam, a cylindrical control ring, and a reciprocating member to linear motion of the reciprocating member which reciprocating member is operatively connected to a poppet valve. Timing and lift of the reciprocating member and valve are variable over predetermined limits as a function of engine rpm and load by rotation of the cylindrical control ring. Each valve train positively closes as well as opens its associated valve.