Abstract: A tappet (1) is made such that it can be coupled for different valve lifts. To assure a sufficiently rapid supply of hydraulic medium to the coupling means (10) of the tappet (1) in the base circle phase of the cam, according to the invention, the tappet (1) is in permanent hydraulic communication with a supply gallery (23). As a result of this, a pre-pressure of hydraulic medium already prevails in the reservoir (15) in front of the coupling means (10) immediately before the desired coupling, so that the desired coupling of the coupling means (10) can take place sufficiently rapidly even at high speeds of rotation of the internal combustion engine.

Abstract: A cam system to generate valve actuation in an engine that includes a circular camlobe rotated about a first axis is described. The first axis is a preselected distance from the centerpoint of the circular camlobe. The cam system also includes a cam-follower that surrounds the camlobe and that has an inner oval surface with a major and minor axis. The inner oval surface is in moving contact with the circular camlobe during rotation of the camlobe.

Abstract: A device for hydraulic rotational angle adjustment of a shaft to a drive wheel, especially the camshaft of an internal combustion engine, has ribs or vanes that are nonrotatably connected with the shaft, said ribs or vanes being located in the compartments of a compartmented wheel. The compartments of the compartmented wheel and the ribs and/or vanes produce pressure chambers by whose hydraulic pressurization the two structural elements can be rotated relative to one another. In order to secure the two structural elements against undesired rotation when an insufficient adjusting or retaining pressure is present, a common end face of the compartmented wheel and of the ribs and/or vanes cooperates with an annular piston that exerts a releasable clamping action on the parts that are rotatable relative to one another.

Abstract: A valve timing control device incorporates a cam shaft rotatably assembled within a cylinder head of an engine, a rotational transmitting member mounted around the peripheral surface of the cam shaft so as to rotate relatively thereto within a predetermined range for transmitting rotational power from a crank pulley. A plurality of vanes are provided on the cam shaft or the rotational transmitting member. Fluid chambers are formed between the cam shaft and the rotational transmitting member and separated into advancing chambers and delaying chambers by the vanes. A fluid supplying device supplies fluid under pressure to at least a selected one of the advancing chambers and the delaying chambers. A coil-spring is disposed between the cam shaft and the rotational transmitting member so as to expand one of the advancing chambers and the delaying chambers. A restricting device is used to restrict the radial movement of the coil-spring.

Abstract: A hydraulic lash adjuster having a piston capable of forming a pivot for a member of an engine valve train connecting a cam and a valve includes a hydraulic lash adjusting element of varying length for acting in the valve train, an expansion spring for extending the length of the lash adjuster to take up lash in the valve train between valve opening events and a lash spring which biases the adjuster element away from the piston a small amount to maintain a sufficient amount of lash in the valve train between valve opening events to prevent holding open of the valve during cold engine operation. Various embodiments of lash adjusters and lash springs are disclosed. During steady state operation, the lash spring introduces a fixed amount of mechanical lash into the valve train. In nonsteady state transient operations, such as during cold engine start up, the amount of mechanical lash may be reduced when growth of the valve train components exceeds the leak down rate of the hydraulic lash adjusting element.

Abstract: A valve-operating device for an internal combustion engine equipped with two cylinder banks each having a variable valve timing and working angle mechanism comprises a drive shaft, a cylindrical hollow camshaft fitted to an outer periphery of the drive shaft to be rotatable relatively about the drive shaft, a non-uniform velocity coupling including an annular disc disposed between the drive shaft and the camshaft for transmitting motion of rotation from the drive shaft to the camshaft, permitting a phase change of the camshaft relative to the drive shaft with non-uniform rotation during eccentric motion of the annular disc, and a control housing rotatably supporting the annular disc. Also provided is a decentering mechanism supporting the control housing rockably to produce the eccentric motion of the annular disc.

Abstract: An arrangement for interrupting the flow of force between a camshaft and a valve in the valve gear of an internal combustion piston engine comprises a camshaft with a cam, a rocking lever which is mounted fixedly with respect to the engine casing and the rocking movement of which is actuated by the cam and an actuating member mounted on the rocking lever and guided on the rocking lever movably relative thereto, for actuation of the valve. A movable coupling member is mounted on the rocking lever and is movable by means of an actuating device into a first position in which for actuation of the valve it provides a rigid connection between the rocking lever and the actuating member and into a second position in which the actuating member is movable relative to the rocking lever so that actuation of the valve is interrupted.

Abstract: A valve operating apparatus for DOHC engine allowing to improve the fuel consumption, in DOHC engines, is provided with by reducing the weight of the shaft system of valve operating mechanism and lowering the driving force for the dynamic valve and, at the same time, permitting to improve the durability and the silence of the transmission system and, moreover, assuring a good combustion even for engines having smaller bore diameter. A first and a second cam shafts for opening/closing the intake/exhaust valve are arranged side by side on a cylinder head, a first transmission means is disposed at a shaft end of the first cam shaft positioned at one side of the engine and, at the same time, shaft ends of the first and second cam shafts located at the other side of the engine are linked for the transmission of the driving power by a second transmission means.

Abstract: An overhead cam internal combustion engine having a slanted head design which permits the camshaft assembly comprising a camshaft, rocker arms and valve assemblies to be pre-assembled to the head and valve lash to be set off of the main engine assembly line. The slanted head design allows the chain sprocket and timing chain for driving the camshaft to be installed thereon after the head has been assembled to the engine block, accommodating the easy installation of the timing chain. L-shaped rocker arms, mounted on a single shaft, follow a single lobe overhead camshaft. Each rocker arm actuates a valve located on the side of the camshaft opposite that which it follows.

Abstract: Upper and lower contact discs (5, 6) are used for adjusting valve clearance with a mechanical cup tappet (1). The lower contact discs (6) have a substantially larger clearance adjusting range H.sub.SW than the upper contact discs (5). In this way, the invention succeeds in further reducing the total mass of the cup tappet (1) because, in an initial mounting of the cup tappet (1), the valve clearance is adjusted through the relatively small lower contact disc (6) and thus with relatively small mass fluctuations.

Abstract: In a rotational phase adjusting apparatus which may be used for controlling opening/closing timings of intake and exhaust valves of an internal combustion engine, one side wall of a housing is fixed to one of a driving member and a driven member, while the other side wall of the housing is made integrally with a circumferential wall of the housing. A seal made of a material less harder than the housing is provided between the housing and a vane. The housing is made of an aluminum while the seal is made of a PPS resin mixed with an inorganic filler. The inorganic filler is harder than the PPS resin but less harder than the housing to reduce wear of the housing.

Abstract: An internal combustion engine has two intake valves for each cylinder which can be uncoupled from the respective tappets by drawing fluid under pressure out of a chamber interposed between each tappet and the respective valve. To each engine cylinder there are associated two intake valves, one of which is actuated only at high speed and high loads of the engine. The engine is deprived of the conventional throttle valve. The two intake conduits associated with each cylinder have different specific shapes.

Abstract: A double wheel roller 31 and a pair of outboard rollers 35 are positioned, respectively, along a pair of parallel tracks 25 disposed on a rocker arm 15 and a pair of parallel rails 37 disposed on a pair of support plates 39 disposed on opposite sides of the rocker arm 15, a control rod 49 is utilized to move the rollers 31 and 35 along the tracks 25 and rails 37 to vary the pivot point of the rocker arm 15, and thus vary the lift of an intake valve 7 or the amount the valve 7 opens and vary the amount of combustion air admitted to the cylinder 4, which cooperates with the amount and timing of fuel injected into the cylinder 4 and the timing of the spark to control the speed and power output of a fuel injection, spark ignition, engine 2.