Abstract: A variable valve device for an internal combustion engine includes an internal combustion engine body having a plurality of cylinders, a variable valve mechanism which is provided in the body and is switchable between at least two modes with oil pressure, a mode switching oil control valve which switches the variable valve mechanism to each mode, and a camshaft-driven mode switching oil pump which supplies an oil pressure for switching driving to the variable valve mechanism according to the switching of the mode switching oil control valve. The mode switching oil control valve is, along with the mode switching oil pump, provided in an outer wall surface of the body.

Abstract: There is provided a cam follower in which a surface roughness of an outer surface of a roller of a cam follower which is in rolling contact with a cam of an engine is obtained individually in an axial direction and a circumferential direction, a skewness Rsk of a profile is formed to be negative, a core roughness depth Rk is made to be 0.3 or less, a reduced valley depth Rvk is made to be 0.3 or less, and a ratio Rk/Rt of the Rk to a maximum height Rt of the profile is made to be 0.19 or more.

Abstract: There is provided a rocker arm of a kind in which even though the rocker arm is manufactured by the use of a press working technique the arm width can be minimized while the flat outer surface region of a required width is secured on an outer surface of the connecting wall, thereby contributing to reduction in size and weight of the rocker arm. This rocker arm is capable of being driven by a cam for selectively opening and closing a valve of an internal combustion engine. This rocker arm includes an arm body prepared by bending a single plate material to represent a generally inverted U-shaped section including opposite side walls and a connecting wall bridging between the opposite side walls. A roller engageable with the cam is rotatably mounted on a portion of the arm body generally intermediate of the length thereof.

Abstract: A lift-variable valve-operating system for an engine, includes a subsidiary cam swingably carried on a movable support shaft. A cam follower is operatively connected to an engine valve and follows the subsidiary cam. The lift amount of the engine valve is varied by displacing the movable support shaft. The subsidiary cam has an oil sump provided in an upper surface and opens upwards to store oil. The subsidiary cam is provided with an abutment face abutting against the cam follower. The abutment face includes a lift portion for turnably driving the cam follower; and a base circle portion connected to the lift portion and which retains the cam follower in a rest state. The subsidiary cam is also provided with a lubricating oil bore for guiding the oil in the oil sump to the base circle portion.

Abstract: A rocker arm 6 that is rockably attached to a cylinder head 1 actuates a valve 4 by means of a guide groove 73b that is formed at an end thereof engaging with an upper end of a valve stem 41, and a roller 8 that is mounted in a roller housing portion 72 of the arm main unit 7 contacting against a cam 31 and rocking. The guide groove 73b is formed by press working ends of the arm main unit 7 in the thickness direction of the plate material to form a pair of walls 73d, and thereafter applying sandwiching pressure in the lateral direction to the walls 73d to increase the height thereof.

Abstract: A valve operating mechanism of an internal combustion engine, comprises a drive cam rotatable with and eccentric to a drive shaft; a link arm having a circular opening in which the drive cam is rotatably received, so that rotation of drive cam about an axis of the drive shaft produces a swing movement of the link arm; a pair of swing cams swingably disposed on the drive shaft at both sides of the drive cam, the swing cams being connected through a movement transmission mechanism to the link arm to be swung when the link arm is subjected to the swing movement; a pair of swing arms respectively actuated by the swing cams for carrying out an open/close operation of a pair of engine valves; a pair of spring retainers respectively provided by the pair of engine valves; and a pair of valve springs respectively held by the spring retainers and biasing the engine valves in a close direction. A lubricating oil passage is formed in the drive cam.

Abstract: The present invention relates to a process for producing a wear-resistant coating and to a wear-resistant coating on predetermined surfaces of machine or engine parts, in particular for internal combustion engines, which are exposed to frictional wear, comprising at least one nanocrystalline functional layer (4) made up of at least two CrNx phases for reducing friction and increasing the wear resistance of the predetermined surface (2) of the machine or engine part (1).

Abstract: A hydraulic valve lifter assembly including a lifter body and a cam follower. The cam follower is mounted to an end of the lifter body wherein the lifter body has a first diameter over a first body portion for engaging a wall of an engine bore. The lifter body also including a second diameter smaller than the first diameter over a second body portion supportive of the cam follower. The hydraulic valve lifter assembly further including a contiguous annular transitional chamfer between the first and second diameter portions of the lifter body.

Abstract: A rocker arm is swingably supported by a control shaft that has an eccentric control cam formed thereon. The rocker arm is swung by a torque of a crankshaft of the engine. Two swing cams are swingably supported by a drive shaft and actuate respective engine valves to make an open/close operation of the same by receiving the swinging movement from the rocker arm. The rocker arm comprises a cylindrical base portion through which the control shaft passes; a first projected end that is provided at a first radially outside part of the cylindrical base portion in the vicinity of one axial end of the cylindrical base portion, the first projected end receiving the torque from the crankshaft for carrying out the pivotal movement of the rocker arm; and two second projected ends that are spaced from each other and provided at a second radially outside part of the cylindrical base portion, the second projected ends actuating the two swing cams when the rocker arm is swung.

Abstract: A rocker arm is adapted for use with an engine including a push rod, a valve unit and a pivot ball disposed on a supporting frame. The rocker arm is connected pivotally to the supporting frame, and includes a main plate having a central opening defined by an upper edge, a horizontal lower edge disposed under the upper edge, and two curved lateral edges interconnecting the upper and lower edges. The lower edge has an intermediate portion formed with an outwardly flared recess that defines an upwardly facing socket engaging the pivot ball. A first arm plate is connected integrally to a lateral side of the main plate and is driven by the push rod. A second arm plate is connected integrally to an opposite lateral side of the main plate and operates the valve unit.

Abstract: The present invention provides a variable valve operating mechanism which includes two valve operating members for opening and closing two valves individually, a drive cam provided on a single camshaft, two swing arms for transmitting a power of the drive cam to the valve operating members individually by swinging about a different axis to the camshaft, and a variable device for modifying a displacement of the swing arm per rotation of the drive cam in accordance with an operating condition of an internal combustion engine. The variable device includes a single control shaft, an actuator for driving the control shaft, and a cam device that operates in conjunction with the control shaft to dissimilate the displacement of the two swing arms.

Abstract: The invention provides a valvetrain configuration in an internal combustion engine in which a plurality of two-step rockers enable the engine poppet valves to switch between two lift profiles. In addition, a lost-motion stationary lash adjuster enables the deactivation of the engine poppet valve. The integration of a two-step rocker with a deactivating stationary lash adjuster yields a better control of the combustion process, under different engine operating conditions than what is achievable with either one of these actuators acting alone. Preferably, the locking and unlocking of the two-step rocker arm and deactivating stationary lash adjuster is controlled by two on/off hydraulic valves in a hydraulic circuit, and a piloted check valve prevents hard landings between stationary and moving components within the stationary hydraulic lash adjuster.

Abstract: A valve drive for charge-cycling valves of internal combustion engines, which are held in the closed position by means of spring force, and can optionally be activated by a main cam or additionally by a secondary cam of a camshaft, in which connection the main cam with its elevation curve and angle setting is adapted to the crankshaft of a charge-cycling process to be controlled, and the secondary cam operates separately from the main cam. The drive variably controls an additional opening procedure of a charge-cycling valve, separate from the charge-cycling stroke to be controlled directly, in order to sensitively regulate the exhaust gas feed-back in this manner. The drive has two engagement surfaces for introducing movements on a pivot lever mounted on the cylinder head, which activates at least one charge-cycling valve.

Abstract: A system (1) comprising a cam (2) with a cam lug (3) and a cam follower element (11) which undergoes an oscillating reciprocating movement in the direction of its longitudinal axis (12) when the cam (2) rotates, in which the central plane (5) of the cam (2), which extends perpendicularly with respect to the rotational axis (4) of the cam (2), is arranged offset with respect to the longitudinal axis (12) of the cam follower element (11) by an eccentricity E1, so that the cam follower element (11) rotates about its longitudinal axis (12) when the cam (2) is in engagement, with its cam outer face (6) along a contact line (10), with the cam follower element (11). The cam (2) has at least one groove (7) in its cam outer face (6) in the circumferential direction at least in the area of the cam lug (3).

Abstract: The present invention provides a compact variable valve operating device that is capable of mechanically changing the operating characteristic of a valve. The rotation motion of a camshaft is input to the valve via a swing member. A slide surface is formed on the swing member. Intermediate members are positioned in contact with both the slide surface and drive cam surface. A support member for supporting the intermediate members is mounted on a control member. The control member can rotate in relation to the camshaft and is interlocked with a control shaft via rotation interlock mechanisms. When the control member rotates in coordination with the rotation of the control shaft, the intermediate members move along the drive cam surface and slide surface. The operating characteristic of the valve then changes in coordination with a positional change of the intermediate members.

Abstract: A desmodromic valve and cam system is provided which is adapted to be installed into an internal combustion pushrod engine. The system includes a camshaft assembly having a plurality of removably attached cam lobes installed onto a main camshaft; a valve connector assembly installed onto a distal tip of each valve; a rocker having a valve movement end mechanically linked to a respective valve connector and a pushrod connecting end mechanically linked to an upper distal end of a pushrod; a hydraulic lifter follower assembly assigned to each valve which includes a pin disposed on a distal end thereof which is adapted to engage and track a follower groove formed on each respective cam lobe; and a pushrod assigned for each valve, each pushrod having lower distal end mechanically linked to a respective hydraulic follower lifter.

Abstract: A valve gear includes a camshaft having valve gear cams, first and second rocker shafts, a first rocker arm supported on the first rocker shaft, and a second rocker arm supported on the second rocker shaft: The valve gear cams, respectively, include a cam nose projecting from a base circle, and the first rocker shaft supporting the first rocker arm is positioned forwardly of a center line, which passes through a center of the camshaft to extend axially of a cylinder, in a direction of rotation of the camshaft:. The first rocker shaft is shifted closer to the camshaft than a center of rotation of a roller bearing is, when the roller bearing won the first rocker arm contacts with the base circle of the valve gear cam.

Abstract: A valve train for an internal combustion engine is provided, with the valve train having a switchable rocker arm assembly (1) with a plurality of rocker arms (6, 7, 8) for activating at least one gas exchange valve (2), and also having at least one camshaft (3) with differently contoured cams (4, 5) through which different adjusting displacements can be imparted to individual rocker arms of the rocker arm assembly (1). The assembly further includes a switching device (9) for selectively activating the rocker arms for driving the gas exchange valve (2) with a varying valve lift.

Abstract: A device for controlling the variation of the opening and closing times and durations of a valve (8) comprises an elastic means (18) acting upon an assembly consisting of a lever device (1) and a valve stem (11) not in the closing direction but in the opening direction of the valve (8). The assembly consisting of the lever device (1) and of the opening cam (5) and the closing cam (6) fulfils a dual function, one for opening the valve (8), the other for moving it back for its closure. The control device, which comprises a device for offsetting the angular position of the cam position relative to the crankshaft, allows to control the opening and closing duration of the valve (8) over a very wide range extending, for opening, from 210° to 350° of crankshaft rotation approximately, by varying the valve opening and closing times independently of each other. It is applicable to a wide range of engines.

Abstract: An adjustable valve rocker lever (1) of a valve timing gear of an internal combustion engine, having an inner lever (3) and an outer lever (4) enclosing the former with its arms (2), the levers (3, 4) running on a common axis (5) so that they can swivel relative to one another and being connectable to one another by way of coupling links (6) in such a way that a large valve lift is generated when coupled and a comparatively smaller or zero valve lift is generated when decoupled, the inner lever (3) on an underside (7) at one end (8) of the axis (5) having a seating face (9) for an exhaust and refill valve and at the other end (10), a complementary face (11) for a support element, and at least the outer lever (4) having a lifting face (12) for a lifting cam, and a lost-motion spring (13) being provided between the levers (3, 4), the axis (5), viewed in the longitudinal direction of the valve rocker lever (1), being arranged between the seating face (9) for the exhaust and refill valve and a section directly in

Abstract: A valve actuating link is provided for transmitting a combined movement of a drive cam on a cam shaft and a control cam on a control shaft to a valve pressing structure of an engine valve. The valve actuating link comprises a bearing portion that bears the control shaft, a hook-shaped lower portion that surrounds the cam shaft keeping a given space therebetween and a cam portion that repeatedly pushes the valve pressing structure to induce an open/close operation of the engine valve.

Abstract: A rocker arm 1 made of sheet metal is formed so that Vickers hardness Hv of the surface layer portion 9a of the valve stem receiver 9 is set at Hv 650 to 800 and a quantity of the retained austenite ?R is set at 25 to 35 vol %.

Abstract: A cam follower of a valve drive of an internal combustion engine, having a run-on surface for following at least one cam. The run-on surface has a microstructure comprising depressions for accumulating lubricant, wherein the depressions form an at least largely symmetrical microstructure similar to a grid. Two depressions of each enclosed section of the run-on surface running toward each other in the manner of an arrow to form a corner such that they point at least in the predominant direction of a movement of a contact point of a cam on the run-on surface.

Abstract: The invention relates to a rocker actuator (1) switchable to different cam travels. The inventive rocker actuator (1) comprises an external lever (2) which is arranged between the arms (3) and to which an internal lever (4) is pivotally connected.

Abstract: A rocker arm is disclosed for valve actuation in an internal combustion engine. The rocker arm includes at least two rotational axes which can be selected as desired to modify a relation between a force arm and a load arm. Control times and valve lift can thus be influenced in a targeted manner.

Abstract: A variable valve apparatus is employed a configuration in which, at a high valve lift and high speed operation of an internal combustion engine, an oscillating fulcrum of a transmission arm and a rotation center of a control shaft are arranged between a direction of a component rotating a control shaft of a maximum load which occurs in the oscillating fulcrum of the transmission arm when an oscillating cam oscillates in a valve opening direction and a direction of a component rotating a control shaft of a maximum load opposite thereto which occurs when the oscillating cam oscillates in a valve closing direction.

Abstract: An engine valve actuator assembly is provided that includes a movable roller finger follower operatively engaged with a displaceable engine valve. A rotatable camshaft with a plurality of different cam lobes having different profiles rotates about the roller finger follower. A plurality of intermediate finger followers contact different ones of the cam lobes and pivot about a common axis. One of the intermediate finger followers is in continuous contact with the roller finger follower. One or more additional intermediate finger followers are separately selectively engageable for common pivoting with the intermediate finger follower that remains in continuous contact with the roller finger follower, thereby varying displacement of the engine valve depending upon the various cam profiles.

Abstract: This variable valve train has a camshaft, a rocker shaft, and a rocker arm mechanism for transmitting a motion of a cam formed on the camshaft to a valve. The rocker arm mechanism includes a first arm which drives the valve, a second arm, a third arm, and a variable mechanism which rocks the rocker shaft. The first arm is rockably supported on the rocker shaft. The second arm is driven by the cam and rocks around a universal joint as a pivot on the side of the rocker shaft. The third arm is displaced to drive the first arm as the second arm rocks.

Abstract: Lost motion systems and methods for providing engine valves with variable valve actuation for engine valve events are disclosed. The system may include a master piston hydraulically linked to a slave piston, and a dedicated cam operatively connected to the master piston. The slave piston may be disposed substantially perpendicular to the master piston in a common housing. The slave piston is adapted to actuate one or more engine valves. The slave piston may incorporate an optional valve seating assembly into its upper end. A trigger valve may be operatively connected to the master-slave hydraulic circuit to selectively release and add hydraulic fluid to the circuit.

Abstract: In relation to a rocker arm obtained by applying cold forging to a blank made from a metal wire rod, cold forging is applied to a blank obtained by cutting a metal wire rod to a predetermined length to make a second intermediate blank 34b having a pair of side wall sections 2a and a base 39 which connects the two side walls 2a at one of their respective widthwise edges. Punching is applied to the base 39 of this second intermediate blank 34b to form a first and a second connection sections. In the case where it is assumed that a roller 35 is arranged at a position corresponding to an arrangement position of the roller 35 of the rocker arm to be obtained, on the inside of the second intermediate blank 34b which is to be subjected to punch processing, the roller 35 and the base 39 do not interfere with each other. As a result, performance improvement of an engine fitted with this rocker arm is obtained.

Abstract: Method and arrangement for delivering EGR gas to combustion spaces in a multi-cylinder, four-stroke internal combustion engine. Each cylinder, with an associated piston, has at least one inlet valve and at least one exhaust valve (10) for controlling fluid interconnection between the combustion space in the cylinder and an intake system and an exhaust system, respectively. A rotatable camshaft (18) having a cam curve (23) is designed to interact with a cam follower (17) for operation of the exhaust valve (10) during a first opening and closing phase. The cam curve (23) is also designed to interact with a second cam follower (20) during a second opening and closing phase which is phase-offset in relation to the first aforementioned opening and closing phase. This configuration facilitates the cylinder being connected to the exhaust system during the induction stroke, once the exhaust stroke is completed.

Abstract: The invention proposes a connecting element (9) for retaining a lever-type cam follower (1), that serves to activate a gas exchange valve (5) of an internal combustion engine, inseparably on a support element (2) comprising a spherical end (7) on which the cam follower (1) is pivotally mounted through a concave depression (6). The connecting element (9) engages into an annular groove (8) under the spherical end (7). In a connecting element (9) of this type, a central portion (10) of the connecting element (9) bears against an underside (11) of the cam follower (1) oriented toward the support element (2) and forms, through two legs (12, 13) and a crossbar (14) connecting these legs (12, 13) to each other, a U-shaped recess (15) in longitudinal direction of the cam follower (1). This recess (15) engages around the groove (8) after the manner of a fork and orthogonally to a pivoting direction of the cam follower (1), substantially without lash.

Abstract: The invention relates to a mechanical valve play compensation element for a valve drive on a piston combustion engine, comprising a first pressure part (1) which is axially displaceable in relation to a second pressure part (2) and which is fixed in such a way that it can turn about the axis of displacement; a torsion spring element (10) which acts between the first pressure part (1) and the second pressure part (2) and is axially flexible at least to a certain extent; and at least one helical surface (9.1) on the first pressure part (1), to which a corresponding helical surface (9.2) on the second pressure part (2) is allocated, these forming a pair of helical surfaces (9). The surfaces of the helical surface pair (9) are configured as a rough surface and are pressed against each other by the torsion spring element (10).

Abstract: A first camshaft (24) operates the exhaust valves (18) and a first intake valve (12) for each cylinder (8), and a second camshaft (38) operates the second intake valve per cylinder (14), the second camshaft further having a phase adjuster (62) for adjusting the timing of the second camshaft (38) relative to the first camshaft (24). Both the exhaust valves and the first intake valve are actuated by rocker arms (30), (36), for providing a short and light-weight first intake valve rocker (36) having a high maximum operational speed capability and low friction. The first camshaft (24) is located above the rockers, the cam followers are located generally in the middle of the rockers (30), (36), and the rocker mounts (33), (35) are located on the inboard ends of the rockers, providing rockers that have both light-weight and a small pivot angle for providing low valve stem to rocker friction.

Abstract: A switchable cam follower, comprising two relatively movable, e.g., telescopable, units which can be connected via a coupling which engages over a dividing face between the units such that there is a large valve stroke. It is possible to generate no valve stroke or a small valve stroke if the coupling does not engage. At least one spring, which can be loaded compressively or torsionally, acts as a lost motion spring between the units. A compression limiting device impedes movement of the lost motion spring to the blocked position. In an incorrect switching operation in which the coupled units move undesirably toward each other and in a sudden manner under the influence of a valve spring force, movement of the spring into the “blocked” position to become seated is prevented by the limiting device.

Abstract: The invention proposes a cup tappet (1) of a valve train of an internal combustion engine, said cup tappet (1) comprising a hollow cylindrical skirt (3) closed at one end by a bottom (2), said bottom (2) comprising an outer end surface (4) and an inner end surface (6), said outer end surface (4) comprising a contact surface (5) for a cam and said inner end surface (6) comprising a central support (7) for a gas exchange valve, wherein the inner end surface (6) of the bottom (2) comprises a radially extending flat web (8), the support (7) is arranged symmetrically between edges (9, 19) of the web (8), a leg (11, 12) sloping away from the bottom (2) after the manner of a roof extends from each edge (9, 10) up to an inner surface (13) of the skirt (3), and the legs (11, 12) are situated axisymmetrically opposite each other. This cup tappet (1) thus possesses a particularly good rigidity.

Abstract: The invention relates to a revolving gear consisting of a housing (G), a shaft (W), an intermediate member (Z) and an output member (A). The shaft is revolvably guided in the housing in a rotating joint (wb) and actuates the intermediate member by means of a curved joint (zw). The intermediate member is supported by a curved joint (zg) in the housing and is actively connected to the output member by another curved joint (za). The curved joint between the intermediate member and the housing has a controlling section enabling movement to be transmitted to the output member and a locking section preventing movement from being transmitted to the output member. The output member is unequivocally guided in the housing and transmits movement to at least one valve (V).

Abstract: The present valve mechanism for an internal combustion engine makes it possible to reliably perform switching between the low-velocity operation mode and the high-velocity operation mode without delay. The valve mechanism includes: a first rocker arm which is supported by a rocker shaft in an oscillatory manner; a second rocker arm which is supported by the rocker shaft in an oscillatory manner; a cylinder provided for either said first rocker arm or said second rocker arm, said cylinder communicating with an oil passage; a first piston fitted in said cylinder in a slidable manner; an engaging protrusion provided in a protruding condition for the remaining one of said first rocker arm and said second rocker arm, said engaging protrusion being capable of engaging with said first piston; and a second piston which moves said first piston to an engaging position.

Abstract: A valve control system (15) in which there is provided a deactivating rocker arm (51) disposed beneath a conventional, upper rocker arm (27), and disposed within a module housing (17). The deactivating rocker arm includes a latch tab (63) and when the latch tab engages (FIG. 3) a latch member (65), the system operates in a normal, valve activating mode. When the latch member is in an unlatched condition (FIG. 4), the deactivating rocker arm pivots, compressing the valve return spring (41), which thereafter serves as the required lost motion spring, biasing the deactivating rocker arm (51) and lash compensation device (35) back toward their normal position.

Abstract: A valve gear for an internal combustion engine capable of promptly switching the position of a piston in a rocker arm to thereby change the engine operating condition with a satisfactory response, even in a low rotation region in which an adequate amount of oil discharged from an oil pump cannot be expected. Depending on positions of pistons slidably fitted in low-speed and high-speed cylinder portions provided in an intake driven rocker arm, a low-speed or high-speed drive rocker arm is selectively operated to press a corresponding one of the pistons. The piston in the low-speed cylinder portion switched in a low rotation region is made smaller in diameter than the piston in the high-speed cylinder portion, to be enabled to be promptly switched.

Abstract: The invention proposes a valve train of an internal combustion engine comprising a cam (1) and a directly driven cam follower (2), such as a roller tappet. This valve train is additionally designed for effecting an internal exhaust gas recirculation at an exhaust valve. A housing (4) of the cam follower (2) comprises two relatively displaceable elements (8, 9). The cam (1) is configured as a high lift cam (1a) for the inner element (8), and at least one low lift cam (1b) configured out-of-phase to the high lift cam (1a) is provided for the outer element (9). When it is desired to carry out an internal exhaust gas recirculation, the two elements (8, 9) are coupled to each other by a coupling element (10), so that, at the end of the base circle of the high lift cam (1a), the low lift cam (1b) protruding thereinto enables a slight post-opening of the gas exchange valve concerned and, thus also, an exhaust gas recirculation.

Abstract: A rocker arm (25) adapted to engage a pair of cam lobes (15,17), the rocker arm having first (31) and second (33) sidewall portions, and being formed from a flat sheet metal blank (25B) having a nominal thickness (T). The sidewall portions (31,33) define fold regions (51,53) whereby, after each is folded over upon itself, and the rocker arm is formed to have the sidewall portions generally parallel to each other, the fold regions provide first (41) and second (43) cam contact surfaces, each having a width (W) substantially greater than the nominal thickness of the blank.

Abstract: A desmodromic “springless” valve and adjustable cam system is provided which is adapted to be installed onto a head configured for an overhead cam for an internal combustion engine having at least one intake and one exhaust valve per cylinder. The system includes a main camshaft, a cam lobe with a follower groove formed in each side of the cam, at least one intake and one exhaust valve assigned to each cylinder, a valve connector installed onto the distal tip of each valve, a hydraulic lifter assigned to each valve. The system further includes a rocker defined by a valve movement end and lifter end, wherein the valve movement end is adapted to be mechanically linked to a respective valve connector and the lifter end is adapted to be pressed against a respective piston tip by a rocker retainer. During operation (i.e.

Abstract: The present invention relates to a leakdown plunger, comprising a first plunger opening, a second plunger opening, and an outer plunger surface that is provided with an axis and encloses an inner plunger surface, the first plunger opening is provided with a first annular plunger surface shaped to accommodate a valve insert, the second plunger opening is configured to cooperate with a socket body, the outer plunger surface includes a cylindrical plunger surface and cooperates with an engine workpiece, and the inner plunger surface includes an inner cylindrical plunger surface.

Abstract: A valve train device for an engine is adapted to pivot a rocker arm supported on a rocker arm support shaft to drive a valve which opens and closes a valve opening formed in a combustion chamber. The device comprises a valve drive device and a swing member pivotally supported on a swing member support shaft and driven to pivot about the swing member support shaft by the valve drive device. An intermediate rocker member is pivotally supported on the rocker arm support shaft. The intermediate rocker member is provided between a swing cam surface formed on the swing member and a rocker face formed on the rocker arm, for transmitting the movement of the swing cam surface generated by the valve drive device to the rocker face.

Abstract: A rocker arm comprises an arm body, a shaft and a roller. The arm body formed substantially in a U-shape in section by effecting drawing on a metal plate, includes a connection wall connecting a pair of side walls, an aperture formed through the connection wall, and through-holes at positions where the pair of side walls are aligned with each other. A peripheral edge of the aperture is so formed as to be finished by inserting a first finishing die into the aperture from between the pair of side walls. The shaft is fitted in the pair of through-holes and extended between the pair of side walls. The roller is rotatably supported on the shaft.

Abstract: An engine valve actuation system is provided. The system includes an engine valve moveable between a closed position and an open position. A spring is operatively connected to the engine valve to bias the engine valve towards the closed position. An actuator is operatively connected to the engine valve and is operable to selectively engage the engine valve to prevent the engine valve from returning to the closed position and to release the engine valve to allow the engine valve to return to the closed position. A sensor is configured to provide information related to the operation of the actuator. A controller is configured to transmit a signal to the actuator to engage the engine valve to prevent the engine valve from returning to the closed position and to release the engine valve to the allow the engine valve to return to the closed position.

Abstract: In an internal combustion engine provided with valves with variable actuation, each variable actuation valve is controlled by a hydraulic actuator unit through a rocker arm.

Abstract: For a rotary actor device for stroke control of a charge changing valve in the cylinder head of an internal combustion engine with rocking stepper motor for driving a control disk with a cam profile controlling a charge changing valve, wherein the rocking motor is operated accordingly, an interplay of a closing spring of the poppet valve with a biased spring arm, provision is made for the achievement of stable end positions of the control disk, such that it is positioned by means of a separate first and second rotary abutment and is held securely against rotation in the particular starting position by the opening spring acting on a shaft bearing the control disk, while in each case by means of a relatively low powering of the stepper motor or of a ricochet movement brought about by means of corresponding abutments to overcome the starting position, the further supply of power remains substantially reduced by means of a rotor of the rocker motor chosen according to the energy exchange between closing spring an

Abstract: An improved dual feed hydraulic lash adjuster (HLA), for use in an internal combustion engine, comprising a hollow body and a plunger assembly disposed in a bore of the engine. A one-piece plunger body includes a first chamber for forming a low-pressure oil reservoir and receiving a lash adjustment mechanism, and a second chamber open at one end and partially closed hemispherically for supporting a rocker arm and providing valve deactivating oil thereto for an auxiliary valve actuation system. The first and second chambers are separated by a transverse web, optionally having a small-diameter passage therethrough for air evacuation. The one-piece plunger body provides a high degree of resistance to side loads which may be imposed on the HLA in use.