Abstract: A valve train assembly includes an intake rocker arm, an exhaust rocker arm, a carrier configured to couple to a cylinder block and operably associated with the intake rocker arm and the exhaust rocker arm, the carrier including a first aperture, and a cylinder deactivation (CDA) capsule disposed within the first aperture. The CDA capsule is configured to move between a latched condition that transfers motion from a push rod to one of the intake rocker arm and the exhaust rocker arm, and an unlatched condition that absorbs motion from the push rod and does not transfer the motion to the intake rocker arm or the exhaust rocker arm.

Abstract: A valve train assembly includes an intake rocker arm, an exhaust rocker arm, a carrier configured to couple to a cylinder block and operably associated with the intake rocker arm and the exhaust rocker arm, the carrier including a first aperture, and a cylinder deactivation (CDA) capsule disposed within the first aperture. The CDA capsule is configured to move between a latched condition that transfers motion from a push rod to one of the intake rocker arm and the exhaust rocker arm, and an unlatched condition that absorbs motion from the push rod and does not transfer the motion to the intake rocker arm or the exhaust rocker arm.

Abstract: A system for diagnosing malfunctions in a variable valve actuation device is disclosed. The system has a rocker arm assembly that includes: a first arm, a second arm with the first and second arms attached at a first end, a hydraulically operated latch assembly that functions to secure the first arm to the second arm when latched. The rocker arm assembly pivots upon a hydraulic lash adjuster. It also includes a source of pressurized fluid connected to a hydraulic valve that provided fluid high or low pressure fluid to the hydraulically-operated latch. The latch may be operated by a remote device. A pressure transducer is positioned within the hydraulic lash adjuster (HLA) and is adapted to create a signal indicating the fluid pressure in the HLA.

Abstract: An assembly for a valve train of an internal combustion engine, which has a hydraulic support element and a cam follower resting on one end via a bearing surface located on the bottom side thereof on a complimentary end side of a pressure piston of the support element. The piston extends across the outer shell in a bore of a crucible-shaped housing of the support element. The housing has an opening for hydraulic fluid, which is conductible via a channel between the housing and piston through a passage in the pressure piston to a storage chamber. In a section of a direct contact region between the bearing surface of the cam follower and end side of the piston, an anti-turn mechanism for the piston in relation to the cam follower is implemented. The piston is installed in a defined manner and is torsionally oriented in relation to the cam follower.

Abstract: An engine includes a hydraulic pressure lash adjuster (HLA) pivotally supporting an end of a swing arm and having a valve supporting the other end of the swing arm, wherein the hydraulic pressure lash adjuster includes a housing, a plunger of which one end portion thereof may be slidably inserted into the inside of the housing, the other end portion of which extends outwards and supports the end of the swing arm by selectively moving upwards or downwards in a length direction of the housing, a stopper pin slidably mounted in a chamber of the plunger so as to selectively lock the plunger to the housing such that the plunger cannot move in the housing, and a hydraulic pressure supply portion that selectively supplies one side of the stopper pin with a hydraulic pressure in the chamber of the plunger to move the stopper pin toward the housing.

Abstract: Valve clearance compensation element (1) with mechanical, automatic readjustment for internal combustion engines, with an adjusting bolt (3) that is supported in a sleeve (2) arranged on a component of the internal combustion engine by a thread against the force of a spring (8), with a transfer element that is in active connection with a support head (4) of the adjusting bolt (3) and is further supported on a spring-loaded gas-exchange valve and on a cam of a camshaft driven by the internal combustion engine. The adjusting bolt (3) has two parts, the support head (4) and a threaded bolt (5), which are fastened to each other.

Abstract: The present invention relates to a lash adjuster including a ball retainer having a generally conical chamber for situating a ball near the base of the lash adjuster housing. The chamber has both an external and internal shoulder for engaging a plunger spring and a ball spring, respectively. The chamber may further define at least one aperture near its apex and at least one aperture near its base to facilitate oil flow through the lash adjuster.

Abstract: A DHLA including a hydraulic lash adjustment mechanism disposed within a plunger slidably disposed within a pin housing that is slidably disposed within an axial bore in an adjuster body. A lash ring disposed in a groove near the outer end of the DHLA body includes a portion extending into the bore to limit travel of the pin housing and thereby set the internal mechanical lash in the DHLA. The lash ring has a thickness selected to provided a predetermined amount of mechanical lash in the assembled lifter, which thickness varies from assembly to assembly to compensate for manufacturing variation in the components. A biasing means such as a wave ring, a Belleville washer or a beveled retaining ring is also installed in the annular groove to urge the lash ring against the lower surface of the groove under all DHLA operating conditions.

Abstract: An apparatus and method for automatically adjusting the valve lash of an internal combustion engine is provided. In another aspect of the present invention, a probe is employed for verifying and/or setting valve lash settings in an automated manner. A further aspect of the present invention does not require determination of a zero lash position or reference datum prior to adjusting the valve lash adjusting screw for desired lash.

Abstract: The cam follower has a roller, which is movable, between a first axial position and a second axial position and which alternately transmits elevations, which are different from one another. The cam has a cylinder-piston unit, which has a pressure medium space for moving the roller from the first axial position into the second axial position, and a spring means for moving the roller from the second axial position into the first axial position. The piston of the cylinder-piston unit is the roller and the roller has an end wall, which delimits the pressure medium space, and an annular collar which extends from said end wall and whose outer lateral surface serves as a cam pick-off surface. The inner lateral surface of the annular collar surrounds an outer section of the cylinder of the cylinder-piston unit.

Abstract: A deactivation valve lifter includes a lifter body. The lifter body has a first end configured for engaging a cam of an engine and at least one annular pin chamber. A pin housing includes a pin housing bottom. The pin housing bottom defines at least one pin stop aperture and a radially directed pin bore. A deactivation pin assembly is disposed within the pin bore and includes pin members. The pin housing is concentrically disposed within the lifter body. A portion of each pin member may be disposed within the annular pin chamber to thereby selectively couple and decouple the lifter body to the pin housing. A drain aperture defined by the pin housing bottom extends from the pin bore to an outside surface of the pin housing. A stop pin is disposed in the at least one pin stop aperture for limiting the inward motion of the pin members.

Abstract: A force transmitting device (4) for a valve drive (1) of an internal combustion engine (2) with a hydraulic valve lash compensating device (6) is provided. The force transmitting device (4) has a hollow cylindrical compensating piston (13), which on one end defines a working chamber (35) of the valve lash compensating device (6) and on the other end encloses an internal hydraulic medium reservoir (15) used to supply the working chamber (35). This is connected to a hydraulic medium supply (16) of the internal combustion engine (2) and is protected from a return flow of hydraulic medium in the direction of the hydraulic medium supply (16) by means of a valve plate (26), which can be pressurized and which can move axially, in that the valve plate (26) interacts in a sealing way with an axial annular surface (28) of the compensating piston (13) for a non-pressurized hydraulic medium supply (16).

Abstract: Disclosed is a dual oil feed structure of a cylinder de-activation engine for a vehicle, comprising: (a) a main oil hole supplying oil to a hydraulic lash adjuster to adjust a valve gap; and (b) a sub oil hole supplying oil to a roller finger follower which operates the cylinder de-activation device.

Abstract: The invention proposes a switching element (1) for a valve train of an internal combustion engine, particularly for valve deactivation, with a simple-to-implement measure for adjusting the coupling lash of its coupling means (8) in a receptacle (6) using two retaining rings (19, 20), one of which is stocked in a variety of thicknesses.

Abstract: A deactivation valve lifter includes a lifter body. The lifter body has a first end configured for engaging a cam of an engine and at least one annular pin chamber. A pin housing includes a pin housing bottom. The pin housing bottom defines at least one pin stop aperture and a radially directed pin bore. A deactivation pin assembly is disposed within the pin bore and includes pin members. The pin housing is concentrically disposed within the lifter body. A portion of each pin member may be disposed within the annular pin chamber to thereby selectively couple and decouple the lifter body to the pin housing. A drain aperture defined by the pin housing bottom extends from the pin bore to an outside surface of the pin housing. A stop pin is disposed in the at least one pin stop aperture for limiting the inward motion of the pin members.

Abstract: A deactivating hydraulic valve mechanism includes a hydraulic element assembly disposed within cup within a pin housing slidably disposed within a bore in a body. A transverse bore in the pin housing contains selectively-retractable locking pins that engage a locking feature in the body to selectively lock together the body and the pin housing. A lost motion spring is disposed in a vented annular chamber between the body and the pin housing. An oil passage from an engine gallery to the hydraulic element assembly includes an axial component formed in the cup and bypasses the lost motion chamber. A ring holds the lifter assembly together and also sets mechanical lash. The ring may combine a standard-thickness ring and a shim selected to provided a predetermined amount of mechanical lash in the assembled mechanism to ensure facile engagement and disengagement of the locking pins in the body.

Abstract: A switchable cam follower (1) is proposed which serves to transmit a cam stroke in a variable manner from a cam to valve timing mechanism elements of an internal combustion engine. The cam follower (1) comprises substantially a cylindrical inner part (5) and a cylindrical outer part (2) which can be displaced into one another in the direction of their longitudinal axes and can be locked and unlocked in a relative position by means of coupling means (10) which are preferably actuated by pressure-modulated hydraulic medium, and also comprises at least one spring means (7) which is arranged between the inner part (5) and the outer part (2). The inner part (5) has a run-on surface (16) for the cam at one end side (17) and is radially guided in an inner wall (4) of the outer part (2) by way of an outer circumferential surface (6).

Abstract: A force-transmitting arrangement (4) for a valve train (1) of an internal-combustion engine (2) with hydraulic valve play compensation device (6) with a hollow cylindrical compensation piston (15) is provided. The compensation piston (15) borders, on one end, a working space (32) of the valve play compensation device (6) and, on the other end, a hydraulic medium reservoir (33), which is used for supplying the working space (32) and which is connected to a hydraulic medium supply (18) of the internal-combustion engine (2). A run-off safety device (22, 22a, 22b) at least partially prevents a hydraulic medium flow from the hydraulic medium reservoir (33) in the direction of the hydraulic medium supply (18).

Abstract: An oil distribution system for an internal combustion engine comprising a longitudinal bore in the engine head or block connected to an engine oil pump. A longitudinal insert is disposed in the engine bore, the insert being formed and disposed to define segmented galleries within the bore, a first oil gallery being in communication with the engine camshaft bearings and a second oil gallery being in communication with switchable cam followers in the engine. The two galleries are separated but connected by one or more oil control valves. Thus, the camshaft bearings are exposed to high engine oil pressure at all times independent of the switchable cam followers; likewise, the switchable cam followers may be latched and unlatched at any time or condition deemed beneficial for engine operation without jeopardizing lubrication sufficiency to the camshaft bearings.

Abstract: The present invention discloses a variable valve actuation mechanism, characterized in that movement of a sliding block is controlled for selectively receiving a driving force exerted from an actuating mechanism so as to control lift, such as higher or lower lift, of valves disposed in a combustion engine. With the design disclosed in the present invention, a conventional problem due to misalignment of the channel for locking pin sliding during changing lift of valve is capable of being solved. In the preferred embodiment of the present invention, actuating parts for controlling higher valve lift will not contact with the variable valve actuation mechanism while the valve is under lower lift so that the combustion engine will be operated in an appropriate rotation speed efficiently so as to reduce fuel consumption.

Abstract: Disclosed is a dual oil feed structure of a cylinder de-activation engine for a vehicle, comprising: (a) a main oil hole supplying oil to a hydraulic lash adjuster to adjust a valve gap; and (b) a sub oil hole supplying oil to a roller finger follower which operates the cylinder de-activation device.

Abstract: An internal combustion engine is equipped to supply the camshaft bearings with pressurized oil via a first dedicated oil gallery independently of the hydraulic lash adjusters (HLAs) and any valve deactivation devices which are supplied from a second dedicated oil gallery. The galleries may be connected at their downstream ends and a flow restriction is placed in a connecting passage or within each HLA. An improved HLA is similar to a prior art HLA except that the prior art annular oil distribution groove in the outer surface of the HLA body is eliminated to prevent communication of the primary engine oil gallery with the HLA. The secondary gallery is formed remotely from the first oil gallery in the HLA residence bore in the engine, and the HLA is prevented from rotating within the residence bore.

Abstract: A deactivation valve lifter includes a lifter body. The lifter body has a first end configured for engaging a cam of an engine and at least one annular pin chamber. A pin housing includes a pin housing bottom. The pin housing bottom defines at least one pin stop aperture and a radially directed pin bore. A deactivation pin assembly is disposed within the pin bore and includes pin members. The pin housing is concentrically disposed within the lifter body. A portion of each pin member may be disposed within the annular pin chamber to thereby selectively couple and decouple the lifter body to the pin housing. A drain aperture defined by the pin housing bottom extends from the pin bore to an outside surface of the pin housing. A stop pin is disposed in the at least one pin stop aperture for limiting the inward motion of the pin members.

Abstract: The invention proposes a switchable cam follower (1) for a valve train of an internal combustion engine, said cam follower comprising two elements (2, 3) telescoped into each other and, axially displaceable relative to each other. A bore (4) comprising at least one piston (5) extends in the inner element (2). The piston (5) has, on a portion of its outer peripheral surface (7), a stepped entraining surface (8) that starts from the first front end (6) of the piston (5) facing the outer element (3). For achieving coupling, the piston (5) can be displaced with this entraining surface (8) onto a flat counter surface (10) of the other element (3). The entraining surface (8) of the piston (5) extends, starting from the first front end (6), toward a second front end (11) of the piston (5) while tapering into a conical shape generally in the direction toward a longitudinal axis of the piston (5).

Abstract: A deactivation valve lifter includes a lifter body. The lifter body has a first end configured for engaging a cam of an engine and at least one annular pin chamber. A pin housing includes a pin housing bottom. The pin housing bottom defines at least one pin stop aperture and a radially directed pin bore. A deactivation pin assembly is disposed within the pin bore and includes pin members. The pin housing is concentrically disposed within the lifter body. A portion of each pin member may be disposed within the annular pin chamber to thereby selectively couple and decouple the lifter body to the pin housing. A drain aperture defined by the pin housing bottom extends from the pin bore to an outside surface of the pin housing. A stop pin is disposed in the at least one pin stop aperture for limiting the inward motion of the pin members.

Abstract: A device (1) for the hydraulic lash adjustment for several identically acting gas-exchange valves per cylinder of a valve train of an internal combustion engine is provided, the device (1) including a common housing (2) with directly adjacent pressure pistons (3) provided corresponding to the number of identically acting gas-exchange valves. Each pressure piston (3) moves relative to the housing in an axial direction in a separate guide (4) in the housing (2), and also has a support (6) for an at least indirect contact with the corresponding gas-exchange valve on a distal end (5) away from the housing, and a non-return valve (8) in the region of a housing bottom (7) wherein a separate high-pressure chamber (9) is associated with each pressure piston (3) in which the non-return valve (8) opens.

Abstract: A valve timing mechanism of an internal combustion engine of a motor vehicle, having a camshaft having at least one cam (18), via which a switchable valve timing mechanism element (1) can be loaded with a cam stroke (s), in which locking means (12) are arranged on the valve timing mechanism element (1), which locking means (12) have a locking play (16) which is active in the direction of a valve stroke, in which the cam (18) has a base circle region (?) and a ramp region (19) with an opening ramp (?) which adjoins the base circle region (?), and in which at least one ramp section (21) is formed on the opening ramp (?) in order to compensate for the locking play (16).

Abstract: A variable valve actuation system to actuate and control the seating velocity of an internal combustion engine valve is disclosed. The system comprises: a housing; a lost motion system disposed in the housing; a rocker arm having a first contact surface, a second contact surface, and a third contact surface, the first contact surface operatively contacting the engine valve, and the second contact surface operatively contacting the lost motion system; and a valve seating device disposed in the housing, operatively contacting the third contact surface.

Abstract: An adjustable hydraulic valve lifter has a lifter body and an internal cylindrical body. The lifter body has a first longitudinally cylindrical internal bore and a first substantially closed lower end, and the internal cylindrical body is axially slideable and rotatable within the first longitudinally internal bore, forming a first oil chamber. A first spring is positioned to bias the internal cylindrical body away from the lifter body. A first oil flow path permits the flow of oil into the first oil chamber through a first check valve. An oil outlet in the lifter body adjacent the first substantially closed lower end allows oil to escape from the first oil chamber as controlled by an oil control recess in an outer surface of the internal cylindrical body.

Abstract: A deactivation valve lifter includes a lifter body. The lifter body has a first end configured for engaging a cam of an engine and at least one annular pin chamber. A pin housing includes a pin housing bottom. The pin housing bottom defines at least one pin stop aperture and a radially directed pin bore. A deactivation pin assembly is disposed within the pin bore and includes pin members. The pin housing is concentrically disposed within the lifter body. A portion of each pin member may be disposed within the annular pin chamber to thereby selectively couple and decouple the lifter body to the pin housing. A drain aperture defined by the pin housing bottom extends from the pin bore to an outside surface of the pin housing. A stop pin is disposed in the at least one pin stop aperture for limiting the inward motion of the pin members.

Abstract: The invention proposes a coupling mechanism (1) for relatively movable elements (2, 3) of a switchable cam follower (4) of a valve train of an internal combustion engine, a high lift being obtainable upon coupling of said elements (2, 3) and a lift smaller than the high lift being obtainable upon uncoupling of said elements (2, 3), a first one (2) of said elements comprising a guide bore (5) for at least one coupling piston (6) which, for achieving coupling, can be displaced partly beyond a parting surface (7) between said elements (2, 3) into an aligned reception (8) of a second one (3) of said elements, wherein upon cam lift and coupling of said elements (2, 3), a contact zone (9) between the piston (6) and the reception (8) is clearly spaced from an edge section (10) of the reception (8) on the parting surface (7). This can be implemented in practice, for instance, through a special “backwards” oriented flattened portion (14) on the piston (6). Material loading on the edge section (10) is thus avoided.

Abstract: A valve deactivation lifter including means for restricting relative rotation between the pin housing and the lifter body. When used in a V-style or slant engine, a prior art deactivation lifter can be subject to oil drainage during engine shutdown if the oil supply port in the pin housing rests in the “down” position. In an improved lifter, relative rotation between the pin housing and the lifter body is limited and the pin housing is oriented such that the oil supply port is never on the underside of the pin housing. Rotation may be limited by any of several means, for example, a ball disposed in a dimple in the pin housing and extending into a longitudinal groove in the lifter body, and a flat on the pin housing and locking means installed in the lifter body to engage the flat and thus prevent rotation of the pin housing.

Abstract: A cylinder deactivation arrangement for an engine is provided. The arrangement includes an engine with main oiling circuit passages and lifter oil gallery control circuit passages formed internal to a cylinder block of the engine. The lifter oil gallery control circuit is arranged so as to provide an oil flow path internal to the cylinder block from the main oiling circuit to the deactivating lifter. A lifter is positioned in the cylinder block and arranged in fluid communication with the lifter oil gallery control circuit. A control valve is positioned in the cylinder block and arranged in fluid communication with the main oiling circuit and the lifter oil gallery control circuit. The control valve is arranged to allow selective fluid communication of oil from the main oiling circuit to the lifter oil gallery control circuit to selectively control actuation of the lifter.

Abstract: A valve train with a hydraulic lifter in an engine, and a method of configuring a hydraulic lifter of an engine, are disclosed. The valve train includes a valve, a cam, and at least one coupling component. The valve train further includes the hydraulic lifter, which has a nominal length and is coupled at least indirectly between the valve and the cam by way of the at least one coupling component. The valve train additionally includes a mechanism for varying the nominal length of the hydraulic lifter so that the nominal length is substantially closer to a minimum length of the hydraulic lifter than to a maximum length of the hydraulic lifter.

Abstract: A deactivation valve lifter includes a lifter body. The body defines at least one annular pin chamber therein. The lifter body has a first end configured for engaging a cam of an engine. A pin housing includes a pin housing wall and pin housing bottom. The pin housing wall includes an outer surface. The pin housing bottom defines a radially directed pin bore. The pin housing is concentrically disposed within the lifter body such that the outer surface of the pin housing wall is adjacent to at least a portion of an inner wall of the lifter body. A deactivation pin assembly is disposed within the pin bore and includes pin members. A portion of each pin member is disposed within the annular pin chamber to thereby couple the lifter body to the pin housing. An external lost motion spring is coupled to the body and pin housing.

Abstract: A hydraulic system (1) for a switchable valve drive element (10) of an internal combustion engine (33) is provided and includes a throttled connection (13) created from a second channel (9), used to actuate a hydraulic play-compensation element (11) using hydraulic fluid, directly to an external radial side (12) of a coupling element (8). The coupling element (8) is supplied by a first channel (7) with the switching hydraulic pressure. These measures make it possible to keep the first channel (7) as free as possible of undesired air.

Abstract: An engine valve actuation system is provided. The system includes an engine valve having a valve element, a rocker arm having a pivot point, a first end, and a second end, and a valve actuator. The valve actuator has a body member having a chamber adapted to receive a fluid, a seat, and a passageway adapted to conduct fluid into and out of the chamber. A piston is slidably disposed in the chamber of the body member and is operatively engaged with the second end of the rocker arm. A control valve is connected to the passageway. The control valve has a first position where fluid is allowed to flow relative to the passageway to allow the body member to move relative to the piston until the seat moves into engagement with the piston to thereby move the piston to pivot the rocker arm and actuate the engine valve.

Abstract: A valve stroke control for an internal combustion engine of a motor vehicle has a control device for adjusting a valve stroke. It interacts with a camshaft and a control shaft. The control device is actuated by a hydraulic medium and has a first control element and a second control element movable relative to one another. The first control element is sleeve-shaped and the second control element is received in the first control element. A rocker lever is acted on by the camshaft. The first control element is supported on the rocker lever and the second control element is supported on the control shaft.

Abstract: A deactivation hydraulic valve lifter which includes an elongate lifter body having a substantially cylindrical outer surface and an inner wall, the inner wall defining at least one annular pin chamber therein. The outer surface defining at least one annular groove in fluid communication with a high-pressure oil gallery of an engine, the lifter body having a lower end configured for engaging cam of the engine.

Abstract: The aim of the invention is to functionally improve a hydraulic play compensation element for a valve gear of an internal combustion engine. To this end, the play compensation element is characterized by the following features. Both components (4; 6) enclose a pressure chamber (7) between them, which is sealed from the exterior and which has a volume that depends on the relative position of both components (4; 6). A pressure spring (5) that presses both components (4; 6) away from one another is mounted inside the pressure chamber (7). The pressure chamber (7) can be connected to the storage chamber (8) via a spring-loaded one-way valve (10) through which media can flow exclusively into the pressure space. An additional controllable stop valve (11) is provided in the connection of the pressure chamber (7) to the storage chamber (8). A throttling channel (17), which serves as a bypass to the one-way valve (10), is provided between the pressure chamber (7) and the controllable stop valve (11).

Abstract: Described herein is a multicylinder internal-combustion engine provided with an electronically controlled hydraulic device for controlling variable actuation of the valves of the engine. The final phase of the movement of closing the intake valves is slowed down by a hydraulic braking device of an improved type.

Abstract: In a valve-operating system (D) for an internal combustion engine including a main valve lifter (11) lifted and lowered along with a valve (3), a subsidiary valve lifter (12) movable relative to the main valve lifter (11), a cam (15) for a low-speed capable of operating the main valve lifter (11) in a direction to open the valve, a cam (16) for a high-speed capable of operating the subsidiary valve lifter (12) in a direction to open the valve, and a connecting device (33) switched over between a non-connecting state in which the valve lifters (11, 12) are disconnected from each other, and a connecting state in which the valve lifters (11, 12) are connected to each other, a valve spring (22) for biasing the valve (3) in a closing direction is mounted between the valve (3) and an engine body (1), and a lifter spring (23) for biasing the subsidiary valve lifter (12) toward the cam (16) for the high speed is mounted between the subsidiary valve lifter (12) and the engine body (1).

Abstract: A lost motion engine valve actuation system and method of actuating an engine valve are disclosed. The system may comprise a valve train element, a pivoting lever, a control piston, and a hydraulic circuit. The pivoting lever may include a first end for contacting the control piston, a second end for transmitting motion to a valve stem and a means for contacting a valve train element. The amount of lost motion provided by the system may be selected by varying the position of the control piston relative to the pivoting lever. Variation of the control piston position may be carried out by placing the control piston in hydraulic communication with a control trigger valve and one or more accumulators. Actuation of the trigger valve releases hydraulic fluid allowing for adjustment of the control piston position. Means for limiting valve seating velocity, filling the hydraulic circuit upon engine start up, and mechanically locking the control piston/lever for a fixed level of valve actuation are also disclosed.

Abstract: The invention relates to a variable valve drive for a cam-actuated lift valve of an internal combustion engine which is loaded by a closing pressure against the direction of opening, with a hydraulic power generating device acting on the lift valve against the closing force with a control piston arranged longitudinally displaceable in a cylinder and adjacent to a hydraulic control chamber, with a stroke of the lift valve produced by an actuating cam being at least reducible by removing hydraulic liquid from the control chamber by means of a control valve. In order to arrange the valve stroke and valve opening as free as possible in the simplest possible way it is provided that the control chamber is connectable with a high pressure level preferably by means of the control valve.

Abstract: In a switching element (1) for a valve train of an internal combustion engine for switching to different valve lifts, said switching element (1) comprising an outer element (2) having an inner element (4) arranged for axial displacement therein, each of the outer and the inner element (2, 4) comprising a reception (11, 9) aligned to each other in a relative position, at least one piston (10) being arranged in at least one of the receptions (11, 9) for sliding toward the other of the receptions (9, 11) to couple the inner element (4) to the outer element (2) in said relative position, and a high-position stop for defining said relative position being arranged between the inner and the outer element (4, 2), at least one part of the high-position stop is configured as an adjustable, separate element (13). This element (13) cooperates through a preferably conical section (15) of its outer periphery with a complementary chamfer (18) on one end (17) of a guide (16) in the outer element (2).

Abstract: The invention proposes a switching element (1) for a valve train of an internal combustion engine, said switching element comprising an outer element (2) and an inner element (4) that is arranged for axial displacement in a bore (3) of the outer element (2), each of the outer element (2) and the inner element (4) comprising at least one reception (12, 9) aligned to each other in an axially distant relative position which is achieved through a lost motion spring (8), at least one piston (10) being arranged in at least one of the receptions (12, 9) for sliding toward the other of the receptions (12, 9) to couple the inner element (4) to the outer element (2) in said relative position, and a high-position stop for defining said relative position being arranged between the inner element (4) and the outer element (2).

Abstract: In a valve train of an internal combustion engine, which valve train comprises an elongate anti-rotation bridge (6) comprising receptions spaced behind one another for receiving valve tappets configured as roller tappets (4), one of which tappets is arranged in each reception and is directed with a tappet roller (3) toward a cam (2) of a camshaft (1), the roller tappet (4) of the invention comprises on an outer peripheral surface, raised tappet contours (10, 11) that engage into retention grooves of the bridge (6) within the reception.

Abstract: The present invention relates to a variable valve lift system that varies a valve lift in two stages by selectively rigidly engaging a tappet shim.

Abstract: To provide a high performance four-stroke internal combustion engine wherein an increase in a side of a cylinder head is prevented and a valve resting mechanism is provided for a valve lifter. In a four-stroke internal combustion engine with a valve resting mechanism includes a valve lifter having a valve resting mechanism interposed between a valve motion cam and a stem of a poppet valve and a valve lifter spring is provided for biasing the valve lifter in a direction in which the valve lifter is normally held in contact with the valve motion cam. A slide pin holder is pressed against the valve lifter by a spring force of the valve lifter spring that is provided on the valve lifter while a shim portion having a predetermined thickness for controlling a relative positional relationship with the valve lifter is formed integrally with a valve lifter top wall.