Abstract: A valve-lift device for the variable control of gas-exchange valves of an internal combustion engine is provided. The device includes a pivotable lever that is capable of being driven by a camshaft, the pivotable lever having an axis of rotation which can be displaced in a slotted-link track fixed to the housing, and a valve actuation means. The pivotable lever has, at one end, a roller which is driven by a camshaft and, at its other end, a slotted-link roller which is moved along a working curve in a slotted link, the slotted link being designed as an engagement surface of a valve actuation means. A center of rotation of the lever is provided between the roller and the slotted-link roller and the center of rotation of the rocker lever and a supporting axis of the valve actuation means is arranged on a vertical axis in an operating position. In order to set a valve lift, an axis of rotation is displaced in a slotted-link track fixed to the housing.

Abstract: The invention relates to a variably adjustable mechanical valve gear for at least one gas-reversing valve (1) provided with a closing spring (2) on a piston-type internal combustion engine having a drive mechanism (13) for generating a lifting movement that is effective counter to the force of the closing spring (2) on the gas-reversing valve (1) and with a stroke transfer means (4) in the form of a pivoting element (8), arranged between the driving mechanism (13) and the gas-reversing valve (1), which acts upon the gas-reversing valve (1) in the direction of its movement axis (14) and for which the lifting distance in the direction of the movement axis (14) can be changed via an adjustable guide element (11), wherein the pivoting element is connected to the gas-reversing valve with its end that is effective in the direction of the movement axis (14) and to the driving mechanism (13) with its end opposite the gas-reversing valve (1) and is guided to pivot back and forth on the guide element (11) designed as c

Abstract: A centric phase of an operating angle of an engine valve is detected on the basis of an interval between a reference rotational position of a crankshaft and a reference rotational position of a camshaft, and on the other hand, the centric phase is detected each predetermined time, and a Variable valve Timing Control mechanism is feedback-controlled on the basis of a value which has been updated more recently between both detected results.

Abstract: A centric phase of an operating angle of an engine valve is detected on the basis of an interval between a reference rotational position of a crankshaft and a reference rotational position of a camshaft, and on the other hand, the centric phase is detected at a period shorter than a period between the reference rotational positions, and one of those detected results is selected on the basis of a predetermined regulation, and an opening characteristic of the engine valve is operated on the basis of the selected centric phase.

Abstract: A 4-stroke engine incorporating a mono-shaft multi-valve operating system, the multi-valve operating system incorporating a first cam follower assembly that is associated with an intake valve, a second cam follower assembly that is associated with an exhaust valve, and a cam follower channel assembly that is integrated into a crank web of the engine, the cam follower channel assembly including a base circle channel, a cam channel, and a cross-over channel. The cam follower channel assembly is configured to commonly interact with the two cam follower assemblies to operate the intake valve at a first instance, and the exhaust valve at a second instance, with both instances occurring while the crank web completes two rotations. When either of the two cam follower assemblies engages with a cam channel of the cam follower channel assembly, the cam follower channel assembly is configured to provide a camming operation to operate the respective valve.

Abstract: An internal combustion engine that has a camshaft having a plurality of cam lobes, a plurality of valves where each of the valves are actuated by a lifter actuated by the camshaft with a cam lobe. The lifter comprises a lifter body having an upper surface and a lower surface. A cam contact plate pivots on an axis on the upper surface of the lifter body. Opposed hydraulic actuators are present on either side of the axis of the cam contact plate, where each hydraulic actuators comprise a fluid chamber in the lifter body, a piston in the chamber, and a spring biasing the piston into contact with the cam contact plate. The lifter further comprises a line supplying hydraulic fluid to the fluid chambers of the hydraulic actuators and a control valve for controlling fluid flow from one hydraulic actuator to the other hydraulic actuator.

Abstract: A device for providing additional torsional energy for a cam shaft is provided. The device includes at least one main cam lobe formed on a rotating shaft; a valve operating mechanism disposed to be engaged by the main cam lobe; and an outer cylinder encompassing the valve operating mechanism, and capable of movement that is independent of the valve operating mechanism, the outer cylinder being disposed to provide torsional energy to the rotating shaft.

Abstract: The invention proposes a switchable finger lever (1) for a valve train of an internal combustion engine having a compact structure. Through the inner lever (5) of the finger lever (1) it is possible, on the one hand, to realize a support on a gas exchange valve and, on the other hand, a mounting on a head of a support element. An outer lever (2) surrounds the inner lever (5) in longitudinal direction with its arms (3a, 3b) and is pivoted away from the inner lever (5) for effecting uncoupling. The outer lever (2) is mounted for pivoting on a cross axle (14) that extends through the inner element (5) axially above the support (8) for the gas exchange valve. At the same time, coupling elements (6) displaceable in crosswise direction are arranged axially above a complementary surface (9) that serves as a support on the support element.

Abstract: A double roller cam follower includes a longitudinal beam having a first end and a second end, a cam roller rotationally mounted on the beam for engaging a cam lobe and a valve stem roller rotationally mounted on the second end of the beam for engaging a valve stem. The cam roller includes a stepped outer circumference having a larger diameter at its sides to engage the cam lobe and a smaller diameter positioned centrally between the flanking larger diameters to provide clearance between the cam roller and the valve stem roller.

Abstract: To allow both the valve lift and valve timing for an engine valve to be varied in a continuous manner, the variable valve actuating device (1) comprises a camshaft (8) rotatably supported by a fixed part of the engine and provided with a cam (7), a first rocker arm (9) pivotally supported by a fixed part of the engine, the first rocker arm being provided with a first point (12) engaging a stem of an engine valve (6), a drum (11) rotatably supported by a fixed part of the engine and at least partly surrounding the cam, a second rocker arm (10) having a first point (20) pivotally supported by the drum, a second point (21) adapted to engage the cam and a surface engaged by a second point (22) of the first rocker arm, and a control member (25, 26) for selectively turning the drum over a prescribed angular range.

Abstract: A valve lifter is disclosed comprising a lifter housing having a receiver, a switch retainer having at least one bore, and a key disposed in the at least one bore. The key is movable into the receiver to lock the switch retainer against movement relative to the lifter housing.

Abstract: A system for variably actuating valves by means of cams for internal combustion engines has the following type of construction: A camshaft is rotationally supported in the cylinder head and has a fixed position in relation to the valves and their associated stroke-transmitting arrangements. A stroke-transmitting arrangement guided in a fixed position is associated with each of the valves arranged in the cylinder head and closes by means of spring force. A variable position element for adjusting the stroke of the valve is guided in a stationary manner in the cylinder head. An intermediate element is supported and pivotably guided on the variable position element. A cam of the camshaft is engaged by the intermediate element and is supported in a stationary manner in the cylinder head, as well as the stroke-transmitting arrangement associated with the valve.

Abstract: A variable valve mechanism has a switching mechanism for transmitting cam displacement to a first rocker arm from a second rocker arm. A camshaft is disposed obliquely above a rocker shaft. A first abutting portion and a second abutting portion are disposed in a dead space between an upper side of the rocker shaft and a side of the camshaft. The first abutting portion rotationally displaces in a rotational direction of rocker arms together with the first rocker arm. The second abutting portion rotationally displaces together with the second locker arm. The second abutting portion abuts on the first abutting portion from a rotating direction of rocker arms. In the switching mechanism thus configured, displacement of the second rocker arm is transmitted to the first rocker arm with reduced stress burden.

Abstract: A valve drive system capable of reducing the friction resistance of rocker arms and facilitating replacement work of tappet-clearance adjusting shims. The valve drive system can comprise a rocker arm that is slidable between a first position at which the pushing portion engages the shim and a second position at which the pushing portion is disengaged from the shim, and held in the first position through a spring.

Abstract: An internal combustion engine having a valve train that includes a switchable cam follower is provided. The cam follower (20) has a generally cylindrical shape and can move longitudinally in a receptacle (21) of the engine (22), and is acted upon at one axial end by a cam (23) of a camshaft and at the other axial end indirectly or directly by a gas exchange valve of the valve train. A main oil gallery (24) is arranged in the internal combustion engine (22) for introducing hydraulic medium to a valve lash adjustment element arranged in the cam follower (20).

Abstract: Apparatus suitable for use in reciprocally opening and closing a camshaft-actuated valve may include a rotating camshaft (20) having first and second cams (16, 17, 18) respectively defining first and second amounts of valve opening distance. A cam follower (10, 11, 12) may be defined on a mounting pin (24) so as to operatively engage the first and second cams in an alternating manner. At a first rotational position of the cam follower relative to the camshaft, the cam follower operatively engages the first cam and generates the first amount of valve opening distance. At a second rotational position, the cam follower operatively engages the second cam and generates the second amount of valve opening distance. A valve lever (6) transmits the respective generated first and second amounts of valve opening distance to the valve. A locking device (50) releasably locks the mounting pin and cam follower in the respective first and second rotational positions.

Abstract: The current invention provides an inexpensive variable valve mechanism that includes a first intervening member which rotates a small angle rotation about an axis of a support shaft by being pressed by a rotating cam and a second intervening member which lifts a valve by making a small angle rotation about an axis of the support shaft together with the first intervening member thus pressing a cam corresponding part of a rocker arm.

Abstract: An output from each of output rods is converted into an assisting force via a corresponding one of rollers, while an outer peripheral surface of each of the rollers moving together with a control shaft serves as a conversion plane. This output is applied to the control shaft. Hence, as the control shaft is moved in such a direction as to increase valve lift amounts of intake valves, the assisting force can be correspondingly increased. Thus, a suitable assisting force that can act against a thrust force can be applied to the control shaft. As a result, there is no apprehension that a minimum hydraulic fluid pressure will not be ensured on the side of a larger valve lift amount or that responding properties in movements of the control shaft will deteriorate.

Abstract: In a variable phased valve lifter of an internal combustion engine, a roller lifter is allowed to move along a constraining member of a constraining mechanism, and the constraining mechanism is allowed to move freely in a direction substantially parallel to a line perpendicular to the flat surface machined onto the roller lifter. As the roller lifter moves through its arcuate path, the parallel flat surface(s) of the roller lifter will slide across the constraining member(s) of the constraining mechanism, and end members of the constraining mechanism slide fore-and-aft within stationary blocks. The roller lifter is thus prevented from rotating about its longitudinal axis as it moves in arcuate fashion in cooperation with the constraining mechanism, maintaining line contact between the roller and cam lobe of the camshaft.

Abstract: In a variable phased valve lifter of an internal combustion engine, a roller lifter is allowed to move along a constraining member of a constraining mechanism, and the constraining mechanism is allowed to move freely in a direction substantially parallel to a line perpendicular to the flat surface machined onto the roller lifter. As the roller lifter moves through its arcuate path, the parallel flat surface(s) of the roller lifter will slide across the constraining member(s) of the constraining mechanism, and end members of the constraining mechanism slide fore-and-aft within stationary blocks. The roller lifter is thus prevented from rotating about its longitudinal axis as it moves in arcuate fashion in cooperation with the constraining mechanism, maintaining line contact between the roller and cam lobe of the camshaft.

Abstract: A three-step cam-profile-switching roller finger follower includes a body with low-lift, high-lift and medium-lift body sections. Low, high and medium cam followers are carried by the low-lift, high-lift and medium-lift body sections, respectively. At least one locking assembly selectively couples together and decouples the low and high-lift body sections, and selectively couples together and decouples the low and medium-lift body sections.

Abstract: The invention concerns an electrically rotatable shaft, and more particularly, an adjusting shaft (1) of a fully variable mechanical valve train of an internal combustion engine, said shaft comprising an adjusting cam (2). The low-friction and lash-free configuration of a drive required for a rapid and exact functioning of the fully variable mechanical valve train is achieved by the fact that the adjusting shaft (1) is rotated by an actuator (3) that comprises an adjusting lever (4) connected rotationally fast to the adjusting shaft (1), while the free end of the adjusting lever is articulated preferably on the screw nut (10) of a screw-and-nut drive (5) that is driven by an electromotor (6).

Abstract: A fuel valve is provided in the Diesel fuel supply line to a cylinder to be deactivated. A return fuel line is provided and when the fuel valve is closed the fuel is returned to the fuel supply tank. In open position fuel is directed to the top portion of the cylinder. The cylinder is provided with a conventional exhaust valve. However, the intake valve is modified to be located closer to the top of the cylinder. The previous gap of about ¼ inch is reduced to about 0.005 to 0.015 inches. This allows the intake valve to remain open instead of closed as the piston moves upwardly in a deactivated cylinder when the exhaust valve is closed, to allow air to enter the intake valve in the full up position of the piston. This valve system e located in all Diesel engines including Diesel powered motocycles.

Abstract: A variable valve drive mechanism of an internal combustion engine is provided which includes a camshaft that is operatively connected to a crankshaft of the engine such that the camshaft is rotated by the crankshaft, a rotating cam provided on the camshaft, and an intermediate drive mechanism disposed between the camshaft and an intake or exhaust valve of the engine. The intermediate drive mechanism is supported rockably on a shaft that is different from the camshaft, and includes an input portion operable to be driven by the rotating cam of the camshaft, and an output portion operable to drive the valve when the input portion is driven by the rotating cam. The variable valve drive mechanism further includes an intermediate phase-difference varying device for varying a relative phase difference between the input portion and the output portion of the intermediate drive mechanism.

Abstract: A valve actuating system for actuating at least one valve of an engine includes an improved mechanism for varying the timing and/or lift of the valve. The mechanism uses two adjacent rockers that cooperate with two adjacent cams of a camshaft. In one operating condition, movement of a first rocker is transmitted to the valve through the second rocker and in another operating condition only the movement of the second rocker is transmitted to the valve. The rockers preferably cooperate with cams having different lifts. The lift of the cam driving the first rocker preferably is greater than the lift of the cam driving the second rocker.

Abstract: An engine having a cylinder, piston having a skirt having an actuating member, a upper rocker-arm being pivotally coupled to the intake valve, a first push-rod, said being pivotally coupled to the upper rocker arm, a lower rocker-arm being pivotally connected to the push-rod, the lower rocker-arm being positioned so as to engage the actuating member of the piston.