Abstract: In one form a rocker is disclosed coupled with a valve stem at one end and a cam follower at the other end. The rocker is operable to rotate about a fixed axis. In one form the cam follower includes a set of lower rollers operable to follow one cam lobe and an upper roller operable to follow another cam lobe. A leaf spring can be used to couple the cam follower with the rocker. A cam shaft can have a nested configuration including an inner shaft, an intermediate tube, and an outer tube. Cam lobes can be fastened to the cam shaft in one form by fastening through each of the inner shaft, intermediate tube, and outer tube, and in another form by attaching at least two devices inserted from either side of the cam shaft and that are not inserted at least through the inner shaft.

Abstract: An oil control valve assembly for an engine is provided that has a control valve with a valve body, and a manifold that defines a control passage in fluid communication with a valve lift switching component and an exhaust passage for exhausting fluid from the valve. The control valve is controllable to selectively direct fluid from a supply source to the control passage to actuate the valve lift switching component. An elongated tubular member is positioned adjacent the engine component and is operatively connected to the exhaust passage such that fluid flows from the exhaust passage to the elongated tubular member and through the elongated tubular member onto the engine component.

Abstract: The present invention relates to a variable operation angle mechanism that can improve engine performance at transient operation by optimally setting a ratio between change amounts of opening and closing timings accompanying a variation in valve operation angle of intake valve, and relates to an apparatus for and a method of controlling an engine including the variable operation angle mechanism. In the variable operation angle mechanism, ratio RIVO of change amount of opening timing IVO of intake valve to change amount of valve operation angle is set to be 20% or more and 40% or less, and preferably, to be 30%. In engine including a variable valve timing mechanism varying a rotating phase of intake camshaft relative to crankshaft and the variable operation angle mechanism, a target phase change amount varied by the variable valve timing mechanism is corrected for phase change amount accompanying the variation in the valve operation angle.

Abstract: A switchable cam follower of a valve train of a combustion engine, which has an external lever that encompasses an internal lever between its arms. The levers are pivotally moveable relative to one another on an axis applied to a valve-side end. The cam follower also has a stop for a gas exchange valve on an underside on the valve-side end and on the other end has a complementary face for a support element. Additionally, the cam follower has a start face on an upper side for at least one high-lift cam. In one receptacle of one of the cams, a coupling element is seated, which can be brought into engagement in sections in case of coupling with a driving surface of the other lever. Further, a lost-motion spring is clamped between the two levers and is positioned in the region of the other end of the cam follower.

Abstract: In an exhaust valve mechanism for an internal combustion engine the main rocker arm is mounted on a rocker arm shaft for normal valve operation via a cam element. A secondary rocker arm is mounted on the shaft for activation of an exhaust brake mode. The activation is achieved through supply of hydraulic pressure to a piston cylinder arrangement acting between the main and secondary rocker arms. A master piston and a slave piston are connected by a hydraulic-link allowing activation by increased hydraulic pressure. When activating the exhaust gas temperature increasing mode, the master piston is moved to an active position for part of its stroke against the force of a first resilient member. When activating the exhaust brake mode, the master piston is moved the full movement of its stroke against the combined forces of the first resilient member and a second resilient member as active position.

Abstract: A hydraulic actuator (1) comprising a body (2), in which a control arm (5) and a lift means (6) provided with a piston surface (22) are arranged, which lift means is arranged to follow the reference movement of the control arm (5), and an inlet port (3) and an outlet port (4) for hydraulic medium. The body (2) encloses a pressure chamber (10) delimited by the piston surface (22) of the lift means (6), and the movement of the control arm (5) provides a flow connection between the inlet port (3) and the pressure chamber (10) in order to move the lift means (6), and the movement of the control arm (5) in the opposite direction provides a flow connection between the pressure chamber (10) and the outlet port (4) in order to move the lift means (6) in the opposite direction.

Abstract: An apparatus for adjusting deviation of an engine and a continuously variable valve lift device including the same are provided. The apparatus for adjusting deviation of an engine includes an adjustment member connecting a rocker arm to plural output cams, respectively, to adjust lengths between the rocker arm and the output cams, respectively, so that the lengths become equal to or different from each other. The continuously variable valve lift device includes an eccentric cam shaft with eccentric cams installed on its outer periphery, a rocker arm rotatably installed on the eccentric cams to interlock with plural output cams, and apparatus for adjusting deviation provided on the rocker arm to adjust lengths between the rocker arm and the output cams so that the lengths become equal to or different from each other.

Abstract: A continuously variable valve lift device for a vehicle is provided, which includes a drive shaft rotating in association with a crank shaft and having a drive cam formed on an outer periphery thereof, a locker arm shaft provided apart from the drive shaft and having one end that supports a rocker arm rotating and rocking in association with the drive cam, output cams rotatably installed on the drive shaft to interlock with the other end of the rocker arm, and a variable drive part straightly moving the rocker arm shaft in a vertical direction of the rocker arm shaft to vary a valve lift. When a valve is shifted from the high-lift state to the low-lift state, a pumping loss is reduced to improve the fuel consumption ratio. Also, since an advance function is provided, an exhaust-side CVVT can be deleted to greatly reduce the manufacturing cost.

Abstract: A rocker arm may include a first arm defining a first longitudinal bore and a second arm defining a second longitudinal bore. The rocker arm may house a locking assembly including a first actuation pin extending through a first radial passage in the rocker arm, a second actuation pin extending through a second radial passage in the rocker arm, and a first lock pin located in the first longitudinal bore between the first and second actuation pins. An actuation assembly may be engaged with the first and second actuation pins and may be linearly displaceable between first and second actuation positions. The first and second arms may be rotatable relative to one another when the actuation assembly is in the first actuation position and may be fixed for rotation with one another when the actuation assembly is in the second actuation position.

Abstract: A rocker arm may include a first arm defining a first longitudinal bore and a second arm defining a second longitudinal bore. The rocker arm may house a locking assembly including a first lock pin located within the first longitudinal bore, an actuation pin extending through a radial passage in the rocker arm and engaged with the first lock pin, and a first biasing member engaged with the first lock pin and urging the first lock pin toward the actuation pin and biasing the actuation pin radially inward. An actuation assembly may be engaged with the actuation pin and linearly displaceable between first and second actuation positions. The first and second arms may be rotatable relative to one another when the actuation member is in the first actuation position and may be fixed for rotation with one another when the actuation member is in the second actuation position.

Abstract: Variable valve activation system for internal combustion engines includes a first arm, a link mechanism, a swing cam, and a variable mechanism, which continuously varies lift amount of an engine valve. The link mechanism includes a second arm rotatably linked with the first arm for transmitting the movement of the first arm to the swing cam. The variable mechanism includes a first gear provided concentrically with a swing shaft of the first arm and a second gear provided to the second arm concentrically with the link pin so as to engage with the first gear. The rotation of the first gear causes the second arm to swing and varies the swing position of the swing cam with respect to the engine valve, and in a state the first gear is in a halt or stopped position, the first arm causes the second arm to swing in a swing direction of the first arm.

Abstract: A mechanism for compensating systematic uni-directional torque bias imposed on a bi-directional drive actuator shaft, comprising a pallet disposed on an arm for rotation with the actuator shaft. A bucket tappet is engaged by the pallet and contains a helical compression spring. As the actuator shaft rotates and compresses the spring, the load on the pallet increases linearly but the length of the lever arm changes non-linearly at a rate different from the force applied to the pallet. This results in a non-linear torque about the actuator shaft. The torque can be the same at the compression spring preload state as it is at the full load state or it can be biased to be unsymmetrical based on the layout and size of the components and the stroke of the actuator shaft.

Abstract: An internal combustion engine includes a camshaft, a valve, a cam follower and a rocker arm. The cam follower is coupled between the camshaft and the valve. The rocker arm is coupled between the cam follower and the valve. At least one of the cam follower and the rocker arm is configured so as to move through an adjustable distance prior to transmitting motion for moving the valve.

Abstract: The invention proposes a switchable finger lever (1) comprising an inner lever (2) comprising on one end (4), a support (5) for a gas exchange valve and on another end (6), a contact surface (7) for a head of a support element, said inner lever (2) comprising on the one end (4), pivotable outer arms (8) made separately from each other, which outer arms (8) comprise on their upper sides (10), contacting surfaces (11) for high lift cams, a coupling device (12) comprising a coupling slide (13) for simultaneously connecting the outer arms (8) to the inner lever (2) being seated in a section of the another end (6) in the inner lever (2), which coupling slide (13) is seated in an oblong hole (14) extending transversely through the inner lever (2) as also in longitudinal direction of the finger lever (2), the coupling slide (13) comprises two end portions (15) which protrude beyond the outer walls (9),and for effecting coupling, the coupling slide (13) can be displaced with the two end portions (15) partially under

Abstract: A lash adjuster is provided which can be easily assembled and mounted in an arm type valve mounted and in an engine. The valve lifter includes an arm (3) pivotable about a rocker shaft (2), and a lash adjuster (20) mounted in a fitting hole (12) formed in the arm (3) at one end thereof for eliminating a valve clearance. The lash adjuster (20) includes a cylindrical body (21), an adjusting screw (23) held in threaded engagement with an internal thread formed on the inner periphery of the body (21), and a torsion coil spring (31) for applying a rotational moment to the adjusting screw (23) that tends to move the adjusting screw (23) downwardly. With the adjusting screw (23) in threaded engagement with the internal thread (22) of the body (21), the adjusting screw (23) is screwed into the body (21) until the adjusting screw (23) is retracted into the body (21).

Abstract: The apparatus includes a driving shaft (21) with a first gear wheel (22), a frame (23) able to rotate within limits about the driving shaft, a servo mechanism or similar means for controlling the angular position of the frame, a valve-lifting crankshaft (25) with a second gear wheel (24) supported by the frame, a rocker cam assembly (29), a connecting rod (27) pivotally connected to the valve-lifting crankshaft and the rocker cam assembly, a cam follower (32) operatively connected to a charge exchange valve (35), and a spring or similar means (33) for urging the cam follower against a cam lobe. The engine rotates the driving shaft. The first gear wheel rotates the second gearwheel and the valve-lifting crankshaft. The connecting rod transmits motion from the valve-lifting crankshaft to the rocker cam assembly. Stroke, lifting duration, and phase can be controlled by the angular position of the frame.

Abstract: A sealed lash adjuster (100A) has a plunger (2), and a body (1A) accommodating the plunger. In addition, the sealed lash adjuster (100A) has a first seal member (5) on a sliding portion of the plunger (2), and has a second seal member (30) on a sliding portion of the body (1A) that faces the sliding portion. Specifically, the lash adjuster (100A) has the first seal member (5) on the sliding portion of the plunger (2) and the second seal member (30) on the opposing sliding portion of the body (1A), such that a space K formed between the first seal member (5) and the second seal member (30) expands when the plunger (2) is pressed inward, and the space K contacts when the plunger (2) protrudes outward.

Abstract: A system for mounting a control valve on an engine includes an engine head operatively disposed on a cylinder block of the engine. The engine head has one or more open receptacles. A retainer is operatively configured to hold the control valve in the open receptacle. The retainer is further configured to be removeably engaged with the open receptacle. The retainer is co-axial with the open receptacle.

Abstract: A finger follower apparatus to effect opening of an engine valve includes a first member with first and second opposite ends. The first member is pivotally fixed at the first end and operatively engaged with the engine valve at the second end. A second member is slidably engaged with the first member and carries a roller for engagement with a cam.

Abstract: Internal combustion engine provided with a plurality of cylinders divided into a first group and a second group; a control unit for deactivating all the cylinders of the second group; a first exhaust conduit and a second exhaust conduit, which are reciprocally connected at an intersection and which are respectively connected to cylinders of the first group and to cylinders of the second group; a catalyzer, which is arranged along the first exhaust conduit upstream of the intersection and is provided with first sensors for detecting the exhaust gases; and a second catalyzer, which is arranged downstream of the intersection and is provided with second sensors for detecting the exhaust gas composition.

Abstract: A switchable cup tappet for a valve timing mechanism of an internal combustion engine, which has a cup basic body with an annular base loaded by large-lift cams. A hollow-cylindrical projection protrudes from an inner edge of the base and an inner body extends in the hole of the projection. The disc-like base is contacted by a small-lift cam. In a hole of the inner body two coupler pistons are coupled in sections with a driver surface of the cup basic body for a large valve stroke. The small stroke occurs by complete displacement into the radial hole. An annular web, spaced from its end faces at both ends, is attached integrally, in which the radial hole extends with the coupler pistons. The driver surface for the pistons is formed by a lower edge of the projection, which is spaced from the bases.

Abstract: A method for actuating an electromagnetic switching valve (2) which is part of a fluid system s which has different operating states and which has a solenoid (17) and an armature group (19) which can be moved between a first switched position, which enables a flow of fluid, and a second switched position which blocks the flow of fluid, and has a valve-closing body (22) and a magnet armature (20) which is connected to the valve-closing body (22) in a tensile force-free frictional connection. In this context, in at least one operating state of the fluid system, intermediate excitation (30) in order to damp overshooting of the magnet armature (20) is performed between two coil excitations which move the armature group (19).

Abstract: A valve opening/closing timing control device, including: a drive-side rotating body rotating synchronously with crankshaft; a driven-side rotating body arranged coaxially with the drive-side rotating body and rotating synchronously with a camshaft in an internal combustion engine; a partition section provided to at least one of the drive-side rotating body and the driven-side rotating body so as to partition a fluid pressure chamber into a retard chamber and an advance chamber; a seal member preventing leakage of a working fluid between the retard chamber and the advance chamber; and a biasing member engaging with the seal member by a biasing force caused by elastic deformation and biasing the seal member from the partition section side towards the drive-side rotating body side or the driven-side rotating body side.

Abstract: A variable valve lift apparatus may include an input unit, a control link disposed to a control shaft, a driving cam that is provided with a contact portion and pivotally disposed to the control shaft, a valve opening unit that contacts the contact portion and is opened and closed in accordance with pivoting of the driving cam, wherein the control link, the input unit and the driving cam are connected by a connecting unit, and contact positions of the valve opening unit and the contact portion are variable according to a relative rotation angle of the control link around the control shaft.

Abstract: The present invention makes it possible to favorably change valve-opening characteristics of a valve using a simplified configuration without leading to an increase in the number of components and also without causing an increase of friction due to sliding, in a valve operating apparatus for an internal combustion engine in which the valve-opening characteristics of the valve are variable. A changeover mechanism for switching the connection/disconnection of rocker arms disposed between cams and a valve is provided. When a slide pin reaches a displacement end in the retreating direction of changeover pin, the biasing force of a return spring acting on changeover pins is received by an engaging part between a notch part provided in the slide pin and a lock pin in a state separated from a camshaft.

Abstract: A system is provided for varying a duration of a closing phase of an intake valve of an engine. The system includes a tappet assembly coupled to the intake valve, where the tappet assembly includes a first tappet body and a second tappet body within a guide housing. The system also includes a cam coupled to the main shaft. The cam engages the tappet assembly to initiate the relative oscillation of the first tappet body to the second tappet body. The system also includes a hydraulic piston positioned within the guide housing and coupled to the first tappet body. The hydraulic piston selectively varies a duration of the relative oscillation of the first tappet body to the second tappet body based upon a parameter of a hydraulic fluid supplied to the hydraulic piston, to selectively vary the duration of the closing phase of the intake valve.

Abstract: A variable valve actuator presses rocker arms using force transmitted from a drive cam to open/close valves of an engine, and includes a swing arm, which is pivotably coupled to the engine on a first side thereof, and at least two pressing means, which come into contact with the rocker arms on first sides thereof, are pivotably coupled to a second side of a swing arm on second sides thereof, and press the rocker arms when pressed by the drive cam. Thereby, the variable valve actuator can adjust a lift time and a lift distance of each valve without changing positions of the drive cams and the camshaft, and more easily adjust the lift time of each valve, and have very excellent applicability to the engine due to simple internal configuration.

Abstract: A switchable finger lever for a valve train of an internal combustion engine, said finger lever comprising an inner lever comprising on an underside on one end, a support for a gas exchange valve and on another end, a contact surface for a head of a support element, said inner lever further comprising on the one end, axle stubs protruding on two sides of the inner lever, a first outer arm extending for pivoting relative to the inner lever on one of the axle stubs and a second outer arm extending for pivoting relative to the inner lever on another one of the axle stubs, said outer arms extending in direction of the another end while flanking outer walls of the inner lever and being made as separate parts from each other, a cam contacting surface being arranged on an upper side of each outer arm while, in the region of the another end, a coupling device for an optional connection of the outer arms to the inner lever is seated in the inner lever, and a restoring spring means for each outer arm acts at one end ag

Abstract: Provided is a power unit for a vehicle including an engine main body of an engine having: a valve system capable of changing operational modes of each engine valve; valve controlling apparatuses for controlling operations of the valve system; and a crankcase housing a transmission, the engine main body being mounted on a vehicle frame. The power unit for a vehicle achieves reduction in size of the engine main body in a direction along the axis of a cylinder, and increases the freedom of arranging parts designed to be placed on an upper end portion of the engine main body. The valve controlling apparatuses are attached to the top surface of the crankcase.

Abstract: A continuously variable valve lift device of an engine may include a cam shaft having an eccentric cam formed on an outer peripheral surface of the cam shaft so that an oscillating outer-race wheel is coupled to and oscillatable along the eccentric cam, an output cam being rotably fitted to the cam shaft, a sliding shaft for varying the position of the output cam by moving straightly in a front and rear direction according to an engine operating condition, in which the sliding shaft has a deviation adjustment member which is formed to be eccentric toward an outer peripheral surface thereof, and a rocker arm rotably fitted to the deviation adjustment member and one end of which is rotably connected to the oscillating outer-race wheel and the other end of which is rotably engaged with the output cam.

Abstract: This invention will provide a means for the lobe separation angle of the camshaft between the intake and exhaust valves of an internal combustion engine, or any other piston type machine, using a camshaft and valves to control the air flow into and/or out of the engine or piston type pumping or power machine, to vary as the engine or machine operates. This invention will effectively reduce or increase the angular measurement from the intake lobe centerline to the exhaust valve lobe centerline during operation. This modulation of the valve events may be controlled by a computer, manually or automatically. This modulation of the valve events may be controlled by an operator, whether manually or semi-automatically. This modulation of the valve events may be controlled by some other means. The invention will be commanded by an external command to change the valve events as the engine or machine operates and the invention will then change the valve events of the intake valve(s), the exhaust valve(s) or both.

Abstract: A valve drive of an internal combustion engine, with a camshaft including cams for actuating gas-exchange valves, wherein at least one cam, which includes several cam faces, is guided nonrotatably but with freedom of axial movement on the camshaft; wherein a stroke profile, which cooperates with an actuating pin for the axial displacement of the cam or cam piece, is assigned to the associated axially displaceable cam or an axially displaceable cam piece comprising several cams; and wherein the stroke profile of the axially displaceable cam or cam piece in question includes intersecting stroke curves. A guide element is assigned to the end of the actuating pin which can be introduced into the stroke curve of the stroke profile of the associated axially displaceable cam or cam piece, this guide element being supported in such a way that it can rotate or pivot around the axis of the actuating pin.

Abstract: A camshaft assembly may include a first shaft, a second shaft, a first lobe and a second lobe. The second shaft may be coaxial with and rotatable relative to the first shaft. The first lobe may be fixed for rotation with the first shaft and adapted to open a first valve in communication with an engine combustion chamber. The first lobe may define a first valve opening region having a first angular extent. The second lobe may be fixed for rotation with the second shaft and adapted to open a second valve in communication with the engine combustion chamber. The second lobe may define a second valve opening region having a second angular extent greater than the first angular extent.

Abstract: A valve train for an internal combustion engine for actuating gas exchange valves includes a camshaft in the form of a camshaft tube driven by a crankshaft of the internal combustion engine. A selector shaft is disposed in the camshaft tube. A surface of the selector shaft includes a shifting contour having an axial gradient. At least one cam carrier is disposed on the camshaft and axially displaceable but rotationally fixed with respect to the camshaft. Each cam carrier includes an identical base-circle portion and a plurality of cam profiles. A rotationally fixed but axially displaceable shifting sleeve is disposed between the camshaft tube and the rotatable selector shaft of each cam carrier. Each shifting sleeve includes a hole. A shilling ball is disposed in the hole of each shifting sleeve. The shifting ball is coupled with the shifting contour of the selector shaft so as to be guided by the selector shaft so as to axially displace the shifting sleeve by rotation of the selector shaft.

Abstract: An exhaust valve mechanism for an internal combustion engine with at least one exhaust valve in every engine cylinder includes a main rocker arm mounted on a rocker arm shaft and a secondary rocker arm arranged on the main rocker arm and mounted on the rocker arm shaft for the activation of an exhaust brake function. A spring device is so arranged as to act between a fixed point on the engine and the secondary rocker arm, in such a way that the latter rocker arm is caused by the spring force to engage with the cam element of the camshaft.

Abstract: The present invention relates to a continuously variable valve lift system for engines, which can prevent deterioration of fuel efficiency due to a friction loss by a return spring even in a low lift operation state by making a high lift swing angle be larger than a low lift swing angle, easily implement the CVVL by reducing a lost motion angle to an optimum condition, and securely generate an advancing effect in spite of reduction of the lost motion angle. Further, the continuously variable valve lift system is easy and convenient to adjust a clearance of an oscillating cam link, prevent the clearance of the oscillating cam link from being accumulated, and has a convenience of workability in adjusting the clearance in a narrow engine room.

Abstract: Disclosed is an adjusting mechanism for rotating the adjusting shaft of a variable valve control device for combustion engines, in which the crank of a crank-rocker mechanism or slider-crank mechanism is mounted on the camshaft and in which the rocker of the crank-rocker mechanism or the slider of the slider-crank mechanism can entrain the adjusting shaft in the desired direction of rotation by means of switchable freewheels.

Abstract: A valve drive for activation of gas exchange valves of internal combustion engines, with which valve stroke switching is accomplished with little effort, a low construction height, and at low switching forces. Incorrect switching and damage to the camshaft during valve stroke switching are avoided, even at high engine speeds of rotation. An adjustment shaft that is rotatable by the camshaft and parallel to the camshaft has two adjustment devices rotatably disposed on it, along with two tappets between the adjustment devices. The tappets are connected with a shift gate for valve switching between two different cam profiles of a cam package that is axially displaceable on the camshaft. The tappets each have a contour that contacts the adjustment devices via a guide pin. A gear wheel engages with a gear segment on the camshaft, via a drive on the adjustment shaft, to rotate the adjustment shaft.

Abstract: A continuously variable valve lift apparatus includes an input cam disposed to a camshaft and rotating, a follower supporting portion rotatably disposed to the camshaft for changing a relative angle of the follower with respect to the camshaft, a follower that includes a center shaft, is connected with the follower supporting portion via the center shaft, and pivots around the center shaft by receiving rotation movement of the input cam, a straight line guide, an output cam that contacts the follower and reciprocates along the straight line guide, and a valve opening unit that is opened by pushing of the output cam.

Abstract: A cam carrier assembly may include at least a cam carrier mounted on a cylinder head and including a support, an actuator shaft, a portion of which is mounted in the support and rotatable to control a valve life, and a cap mounted on the cylinder head and coupled to the at least a cam carrier to rotatably support the portion of the actuator shaft and surrounding and rotatably supporting the other portion of the actuator shaft, which is not surrounded by the support.

Abstract: A valve motion for an internal combustion engine which suppresses the height of the internal combustion engine low. In a valve motion for an internal combustion engine, a driving mechanism includes a ball screw disposed over an intake side camshaft and an exhaust side camshaft and having threaded portions provided thereon which are threaded in different directions from each other on the intake side and the exhaust side. Sliders are individually provided on the intake side and exhaust side and movable on the ball screw with connecting link members provided between the sliders and a holder member.

Abstract: A valve gear for an internal combustion engine having a sub-rocker arm return spring that is shortened in a longitudinal length of a cylinder. The valve gear for the internal combustion engine is provided with a camshaft, an intake cam turning integrally with the camshaft, a valve cam for opening and closing an engine valve, a link mechanism for transmitting a valve driving force to the valve cam, a holder for supporting a sub-rocker arm support and a driving mechanism for varying a fulcrum position of the link mechanism. A valve operating characteristic can be varied with an oscillating position of the sub-rocker arm support. A sub-rocker arm is provided with a roller, an eccentrically disposed step and a link section. The step is provided with a spring socket, and a return spring is arranged intervening between the spring socket and the holder.

Abstract: A single-cylinder, four-stroke cycle, internal combustion engine arranged in an overhead valve configuration includes a first valve train and a second valve train. The first valve train includes a first cam on a camshaft, a first pushrod driven by the first cam, a first rocker arm attached to the first pushrod, and an exhaust valve driven by the first rocker arm. The second valve train includes a second cam on the camshaft, a second pushrod driven by the second cam, a second rocker arm attached to the second pushrod, and an intake valve driven by the second rocker arm. The first rocker arm is longer than the second rocker arm.

Abstract: A continuously variable valve lift apparatus includes an input cam disposed on an input shaft, a valve opening unit, a control shaft disposed in parallel with the input shaft, a variable member that contacts the input cam, wherein a relative distance between a contact portion of the variable member and the input cam, and the control shaft is variable according to relative angel changes between the variable member and the control shaft, a driving unit that is connected with the variable member and pivots around the control shaft and a driving cam that is disposed between the driving unit and the valve opening unit and drives the valve opening unit according to the pivoting of the driving unit.

Abstract: In a method for operating an electrohydraulic valve control system of an internal combustion engine, the electrohydraulic valve control system comprising at least one gas exchange valve actuator and a gas exchange valve, which is hydraulically actuated by it, an actuation characteristic is acquired during the operation of the internal combustion engine while the gas exchange valve is being actuated and is compared with a reference actuation characteristic, which describes a nominal characteristic of the gas exchange valve actuator.

Abstract: A valve operation control system for an internal combustion engine in which hydraulic pressure applied to a valve operation mode changing mechanism is controlled by hydraulic pressure control means that is formed from a holder mounted on a cylinder head, a spool valve formed by slidably housing a spool valve body in a valve body, and an electromagnetic open/close valve for controlling hydraulic pressure of a pilot hydraulic chamber, wherein the holder (109) is formed by integrally connecting a housed portion (109a) and a projecting portion (109b) by means of a connection portion (109c), the housed portion (109a) being housed between the cylinder head (22R) and a head cover, the projecting portion (109b) projecting outside the cylinder head (22R) and the head cover and having the electromagnetic open/close valve (113, 114) mounted thereon, a seal face (116) with the head cover is formed on the connection portion (109c), and the valve body (110) is provided so as to be connected to the housed portion (109a) whi

Abstract: In an internal combustion engine using poppet type valves, a center pivot rocker arm is moved through a specific path wherein the roller in contact with a cam is moved to alter the phasing of the valves or injectors in the engine. Depending on the interface between the valve or injector and the rocker arm, the rocker ratio of the rocker arm may be altered, giving a change in lift as well. By positioning a control arm at desired points on either side of a centered position, and rotating the control arm about its own pivot point via an arm actuator, phase change is achieved. The arm actuator controls the location of the control arm and thus the timing of the valve or injector relative to the rotation of the cam. Advanced, centered, and retarded phase change is possible depending upon the movement of the control arm.

Abstract: A deactivating rocker arm for use with a cam having at least one no-lift safety lobe is provided. Safety lobe contacting surfaces on the rocker arm are configured for contact with safety lobes during abnormal operation of the rocker arm. When the rocker arm is deactivated, the safety lobe contacting surfaces may come into contact with safety lobes when excessive pump-up of a lash adjuster brings the rocker arm undesirably close to the rotating cam. This contact limits the range of motion of the rocker arm during certain instances of abnormal operation, promoting more effective transition between deactivated and activated states and preventing damaging contact between the rocker arm and the cam lobe.

Abstract: In a variable valve actuation apparatus of an internal combustion engine configured to variably control at least a working angle of an engine valve, a valve actuation mechanism is configured to control a valve acceleration characteristic of the engine valve depending on an engine operating condition. The valve actuation mechanism is configured to bring about a first state where a maximum positive valve-closing acceleration of the engine valve becomes less than a maximum positive valve-opening acceleration of the engine valve, at a maximum working angle. The valve actuation mechanism is further configured so that a second state where the maximum positive valve-opening acceleration of the engine valve becomes less than the maximum positive valve-closing acceleration of the engine valve, exists at a working angle less than the maximum working angle.

Abstract: A spark ignition four stroke internal combustion engine includes two intake valves and two exhaust valves for each cylinder, arranged around a central spark plug and provided with means for varying the lift of the intake valves between a zero value and a maximum value H. A masking wall which masks the curtain area of the intake valves on one side facing towards the exhaust valves is provided in the combustion chamber associated to each cylinder. The axis of each intake valve is inclined with respect to the axis of the respective engine cylinder by an angle not exceeding 12° and the abovementioned masking wall has along the seat of each intake valve a height h in the direction parallel to the axis of the intake valve which is comprised between 0.1 and 0.5 times, extremes excluded, the maximum value H of the lift of the intake valves.