Abstract: A guide for use in a vehicle engine having an engine block, cylinder head, and a cylinder head gasket. The guide comprises a valve lifter retention portion, a push rod retention portion in communication with the valve lifter retention portion via one or more apertures, and an alignment and attachment portion extending from the push rod retention portion and configured to be retained by contact with the cylinder head gasket.

Abstract: A switchable support element (1) for a valve train of an internal combustion engine, said support element (1) comprising a housing (2) that can be arranged through an outer peripheral wall (3) in a reception of the internal combustion engine and in whose bore (4) an axially movable inner element (6) extends, a head (5) of the inner element (6) protruding beyond an edge (7) of the housing (2), coupling elements (8) being associated to the inner element (6) for a selective coupling of the inner element (6) in an axially extended position of the inner element (6) to the housing (2), and said inner element (6) being biased by at least one lost motion spring (9) in a direction leading out of the housing (2), wherein the coupling elements (8) are at least one slide which, in case of uncoupling, is positioned in a guide (10) of the housing (2) extending in radial or secant direction and which comprises a flattened upper side (12) starting from a radially inner front end (11) of the slide, and this flattened upper si

Abstract: A variable valve lift apparatus of an engine may include an inner tappet, an outer tappet centrally receiving the inner tappet, a latching unit inserted in the inner tappet and operated by a hydraulic pressure so as to selectively engage the inner and outer tappets by operation, and a protruding member that is coupled to an upper surface edge of the outer tappet so as to protrude outward from an exterior circumference of the outer tappet, and is vertically slidable along a sliding groove of a cylinder head.

Abstract: A tappet clearance setting apparatus includes a screwdriver, a pneumatic portion, and a controller. The screwdriver engages the tappet screw and the pneumatic portion provides a monitored and air flow through an engine cylinder. The controller directs the screwdriver to tighten the tappet until the air flow through the cylinder is indicative of a valve opening. The controller then directs the screwdriver to reverse directions until the sensed air flow indicates that the valve has closed, which further indicates that the tappet screw is in a reference position. From the reference position, the controller directs the screwdriver to loosen the tappet a predetermined amount to establish the desired tappet clearance.

Abstract: Provided are a rocker arm, a rocker shaft, a valve cap, an adjust screw, a pivot receiving member, and a valve of an arm type valve operating device that can suppress wear and pitching, and attain a long service life. A multiplicity of minute recesses are provided at random in contact portions with other members of those members. A surface provided with recesses has a surface roughness parameter Ryni that is in a range: 0.4 ?m?Ryni?1.0 ?m, and an Sk value of ?1.6 or less. Accordingly, contact surfaces exhibit a high oil-film-forming capacity, so a long service life is attained even under a condition of low viscosity, thin lubrication and extremely thin oil film.

Abstract: A camshaft damping mechanism may include first and second housing members and a biasing member. The first housing member may be engaged with a camshaft. The second housing member may be slidably coupled to the first housing member and may abut an engine structure. The biasing member may be retained axially between the first and second housing members and may force the first housing member in an outward axial direction from the second housing member.

Abstract: A mechanical roller tappet (1a, 1b) comprising a tappet housing (2a, 2b) shaped out of sheet metal, a drive roller (3) actuable by a cam (9) and an axle (5a, 5b) on which the drive roller (3) is mounted, end portions (24) of the axle (5a, 5b) being supported in axle eyes (23) of the tappet housing (2a, 2b), said tappet housing (2a, 2b) comprising a tappet skirt (10a, 10b) and a tappet bottom (16) possessing a contact surface (21) for an adjacent engine component on a power take-off side and at an end of the tappet skirt facing the cam, the tappet bottom is connected to the tappet skirt and is shaped into the interior of the tappet skirt while forming a pocket for receiving the drive roller, the axle eyes being arranged in first sections (18) of the tappet bottom while being spaced from an inner peripheral surface (19) of the tappet skirt and extend substantially parallel to the longitudinal direction of the tappet skirt, the contact surface being arranged on a second section (20) of the tappet bottom connecti

Abstract: A fuel supply pump includes a housing, a shaft in a case, a cam in the case formed eccentrically with respect to the shaft to rotate with the shaft, a tappet on an outer circumferential side of the cam movable in a vertical direction, and a plunger reciprocating with the tappet to pressurize fuel in a chamber. The tappet includes a roller and a supporting member rotatably supporting the roller in its thrust direction. The roller slidingly contacts outer circumference of the cam. The member includes an end face supporting the plunger, a surface at its end on an opposite side from the face and slidingly contacting outer circumference of the roller, and an inner wall supporting the roller in the thrust direction. The roller includes a middle section slidingly contacting the surface along its longitudinal direction, and a contact part at both ends of the section contacting the wall.

Abstract: A switchable support element for a valve train of an internal combustion engine, comprising a housing that can be arranged with an outer peripheral wall in a reception of the internal combustion engine, an axially displaceable pressure piston extending in a bore of the housing, said pressure piston being loaded by a lost motion spring means in a direction leading out of the housing, a head of the pressure piston extending beyond an edge of the housing, and at least one coupling piston extending in a cross-bore of the pressure piston, which can be brought partially into engagement with an entraining surface of the housing for achieving coupling, wherein, starting from an outer front end of the at least one coupling piston, a flattened portion is arranged on an underside of the coupling piston wherein a flattened portion is arranged on an underside of the coupling piston, the entraining surface in the housing per coupling piston is constituted by an underside of a window-like aperture in the bore of the housing

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 having a bore formed therein; an outer piston slidably disposed in the bore, said outer piston having an internal hydraulic passage, an internal chamber defined by an outer piston side wall, and an internal orifice connecting the internal hydraulic passage and the internal chamber; a catch piston slidably disposed in the outer piston; and a cone-shaped extension extending from the inner piston, wherein the cone-shaped extension is adapted to provide a variable flow area through the outer piston orifice to provide improved engine valve seating.

Abstract: A multi-cylinder barrel internal combustion engine includes a valve actuation mechanism having generally L-shaped rockers for actuating valves in the engine. The rockers are arranged in pairs each pivotally coupled to a common rocker support. The pair of rockers actuate respective valves of an adjacent pair of cylinders in the engine.

Abstract: A lift transmitting component (1), particularly for a gas exchange valve train or a fuel pump drive of an internal combustion engine, and a method of manufacturing such a lift transmitting component comprising a housing (2) and a bearing pin (6) fixed in a reception bore (5) of the housing (2) as also a roller (4) rotatable about the bearing pin (6) and optionally mounted on a rolling bearing, said bearing pin (6) being connected to the housing (2) by positive engagement through radially widened front ends (8), the bearing pin (6) is core-hardened over its entire length with a core hardness of at least 58 HRC and its front ends (8) are widened by radial spot riveting.

Abstract: A valve stopping mechanism wherein when hydraulic fluid pressure is low a cylinder operating state is set and a response of a switch from a cylinder stop state to the cylinder operating state is high. An intake valve and an exhaust valve, a first intake valve spring and a first exhaust valve spring are provided for energizing the valves in the direction of closing the valves, valve drive cams, valve stopping mechanisms, on the basis of a stop hydraulic fluid pressure and energization of plunger springs, for selectively generating valve operating and valve stop states. The valve stopping mechanism generates the operating state when the energizing force of the plunger spring is larger than the press force of the stop hydraulic fluid pressure and generates the stop state when the press force of the stop hydraulic fluid pressure is larger than the energizing force of the plunger spring.

Abstract: A simpler configuration of a mechanism for stopping intake/exhaust valves opened/closed by a valve opening/closing mechanism of a rocker arm. An engine E includes an exhaust valve for opening/closing an exhaust port of an exhaust path with a first exhaust valve spring for energizing the exhaust valve in a valve closing direction. An exhaust valve drive cam is rotated in correspondence with the rotation of an engine crankshaft. A rocker arm is swingably provided between the exhaust valve and the exhaust valve drive cam with one end that abuts on the exhaust valve drive cam being pressed according to rotation of the exhaust valve drive cam and swinging to press the exhaust valve by a press member at the other end to move to the open side. An exhaust valve stopping mechanism is provided between the press member of the rocker arm and the exhaust valve.

Abstract: A tappet (1) for a high-pressure fuel pump having a housing (2), the drive input side (7), which serves as a cam run-on face. The housing (2) incorporates a roller (8), wherein the drive output side (3), which serves as a contact surface for a tappet follower part, of said housing (2) bears against an underside (4) of a bridge piece (6) which projects through an inner casing (5) of the housing (2), and a rotation prevention device (11) which projects beyond the outer casing (10) of the housing (2) extends in a window (9) of the housing (2). The rotation prevention device (11) is formed by a radial elongation of the bridge piece (6). A projection extends from the inner casing (5) of the tappet (1) only on a portion situated diametrically opposite the window (7), which projection is integrally connected and is produced by a punching and embossing process and rises in a wedge shape in a direction of the drive input side.

Abstract: A hydraulic support element for a switchable cam follower of a valve drive of an internal combustion engine, which has a pot-like housing with a bore, a pressure piston formed in one piece with an external casing and head projecting over an edge of the housing and a high pressure space for a hydraulic medium. The high pressure space is supplied, via a non-return valve from a first reservoir space, which is fed via first passages in the housing and pressure piston. A second reservoir space is formed in the pressure piston axially above the first reservoir space and is filled by second passages in the housing and pressure piston. From the second reservoir space a hydraulic medium is conducted to the cam follower via an opening in the head. The reservoir spaces are separated by a ball around which the internal wall of the pressure piston is wrapped.

Abstract: A cylinder valve operating system for a variable displacement internal combustion engine having poppet valves includes a cam arm driven by a camshaft and a valve arm selectively driven by the cam arm. A valve arm positioner, which may be hydraulically cushioned, adjustably maintains the valve arm in contact with the valve stem when the valve arm is not being driven by the cam arm, in order that the valve arm will be accurately located for speedy and precise linkage of the cam arm to the valve arm.

Abstract: A lash adjuster for a valve gear includes a plunger movable upward and downward and including a high-pressure chamber, a leak path defined by an inner circumferential surface of a body and an outer circumferential surface of the plunger so that operating oil reserved in the chamber leaks through the leak path, and a ring-shaped member located between the body and the plunger. The member projects into the leak path during normal operation and is elastically deformed radially inward with increase in oil pressure at the chamber side so as to be retreated from the leak path when abnormal movement occurs in the valve gear such that oil pressure in the chamber exceeds a normal range, thereby reducing flow resistance of the oil in the leak path. The member has a surface receiving oil pressure in the chamber thereby to elastically deform the ring-shaped member radially inward.

Abstract: A switchable bucket tappet for a valve drive of an internal combustion engine, which has a bucket base body with a ring-shaped base guided by a skirt projecting from the outer edge of the base in a bore of the engine. A lifting cam acts on the base and a hollow cylindrical extension projects from an inner edge of the base. In the bore, an inner body is axially movable relative to the bucket base body and, formed in the underside of the inner body, is a support for indirect contact with a gas exchange valve. A coupling piston, which has a flattened portion on its upper side, runs in a bore of the inner body and is engaged with a driver surface for full valve lift. A lost motion spring acts between the bucket base body and inner body.

Abstract: The switchable hydraulic lash adjuster uses balls that move radially in order to lock and unlock the switchable elements in the hydraulic lash adjuster. An axially movable piston acts on the ball to force it to engage and to allow it to disengage the inner housing.

Abstract: A variable valve lift apparatus according to an exemplary embodiment of the present invention includes a low lift cam, a high lift cam in parallel with the low lift cam, a low lift tappet body that selectively contacts the low lift cam, a high lift tappet body disposed within the low lift tappet body and constantly contacting the high lift cam, a guide portion that is connected with a valve and selectively connects the low lift tappet body and the high lift tappet body, and a lost motion spring that is disposed between the guide portion and the low lift tappet body and supplies restoring force to the low lift tappet body.

Abstract: A variable valve lift apparatus according to an exemplary embodiment of the present invention includes an outer body connected with a valve for opening and closing the valve, an inner body that is reciprocally disposed within the outer body and contacts a first input cam configured to an input shaft, a lost motion spring disposed between the outer body and the inner body, a connecting portion selectively connecting the outer body and the inner body, a hydraulic pressure supplying portion supplying hydraulic pressure to the connecting portion, and a lubrication circuit supplying lubricant to a contacting portion of the first input cam and the inner body.

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 continuous variable valve lift device includes a valve, which opens/closes a channel by means of reciprocation, a control shaft, which is mounted so as to be able to move toward or away from a reciprocation central axis of the valve, a pivotable shoe, which is pivotably coupled to the control shaft, includes a cam insertion part in a recess or through-hole shape and a slide face slidably contacting an end of the valve, and reciprocates the valve when pivoted, and a drive cam, which comes into contact with an inner wall of the cam insertion part, and pivots the pivotable shoe. Thereby, the continuous variable valve lift device can freely adjust a lift amount and a lift time of the valve without changing positions of the drive cam and camshaft, and thus be easily applied to an existing engine.

Abstract: The present invention relates to a variable tappet, and the variable tappet may include an inner tappet body of which a latching member connecting hole is formed thereto, a protrude portion formed to the latching member connecting hole, an outer tappet body which is disposed around the inner tappet body and slidable to the inner tappet body and a latching member which is disposed to the outer tappet body and selectively connected to the latching member connecting hole.

Abstract: A mechanical adjuster that automatically increases or decreases or decreases valve clearance is provided that includes: a housing (12) having threaded portions (24, 26); a threaded member (14) thread-coupled with the threaded portion (24); a threaded member (16) connected to the threaded member (14) via mutual rotation prevention-couplings (32, 38) and thread-coupled with the threaded portion (26). When a load acting on the threaded member (14) is equal to or less than a valve closing load, valve clearance is decreased by an integrated rotation of the threaded members (14, 16). with a slip torque of the threaded member (14)>a self-locking torque of the threaded member (16). When a load acting on the threaded member (14) is close to or exceeds a valve opening load, valve clearance is increased by an integral rotation of the threaded members (14, 16) with the absolute value of a slip torque of the threaded member (14)>a self-locking torque of the threaded member (16).

Abstract: In a V-type engine for a vehicle, in which a hydraulic valve rest mechanism which selectively holds at least one of an intake valve and an exhaust valve corresponding to a part of plural cylinders in a valve-closed rest state in correspondence with a vehicle running status is provided in a valve actuation unit, and a hydraulic controller which controls hydraulic pressure of the valve rest mechanism is provided in a main engine body, to reduce the distance of oil passage from the hydraulic controller to the hydraulic valve rest mechanism and simplify the structure of the oil passage. A hydraulic controller is provided on at least one side surface of a cylinder head, and may be generally oriented along a line which is substantially parallel to a central axis of a cylinder bore.

Abstract: The invention proposes a push-rod valve train having an adjustable valve tappet (1). This has an outer part (2a, 2b), an inner part (8) and a lost-motion spring (10), which forces the inner part (8) towards a relative position, at least one retainer ring (23), which is fixed in an annular groove (21) of the outer part (2a, 2b) and which interacts with a stop face (22) of the inner part (8), being provided for fixing the relative position, said retainer ring having lugs (28) extending radially inwards and separated by a fitting gap (27). In this the free movement of the valve push rod (15) relative to the lugs (28) is assured by the provision of a torsional locking means (30a, 30b), which serves to fix the radial position of the fitting gap (27) inside the annular groove (21).

Abstract: The switchable dual lifter has two hydraulic lash adjusters, one which is fixed within the common housing, and the other which is movable to allow for deactivation of one of the two valves acted on by the dual lifter. Using the dual lifter with a switchable hydraulic lash adjuster allows for closing of one of the adjacent valves while allowing the other of the adjacent valves to operate.

Abstract: The hydraulic play compensation device, having an outer cylinder part which is closed on one side by a base and in which a piston element which lies on its inside is guided so as to be longitudinally displaceable, with a guide gap, having an oil pressure space having an oil inlet which supplies the oil supply space, and having a connecting duct controlled by a nonreturn valve between the oil supply space and the oil pressure space. For optimized removal of air which is introduced via the oil inlet, it is proposed that a ventilation path which connects the oil supply space and the guide gap is formed in the piston element downstream of the oil inlet and upstream of the connecting duct.

Abstract: A variable valve apparatus includes a high lift cam and a low lift cam in parallel with the high lift cam. A tappet body includes a high lift tappet body that constantly contacts the high lift cam, and a low lift tappet body that is disposed in the high lift tappet body and selectively contacts the low lift cam. An inner column is connected with a valve and reciprocally disposed within the low lift tappet body. A supporting member is disposed below the tappet body. A lost motion elastic member is disposed between the supporting member and the tappet body for supplying restoring force to the tappet body. A first connector selectively connects the high lift tappet body and the low lift tappet body. A second connector selectively connects the low lift tappet body and the inner column.

Abstract: A variable valve system includes a camshaft in which a first lobe having a first height and a second lobe having a second height that is higher than the first height from a rotational center axis of the camshaft are formed; a first tappet that corresponds to the first lobe and that has a depression negatively formed in one side thereof; a second tappet corresponding to the second lobe and that is inserted into the depression; at least a pin positioned at the first tappet and fixing a position of the second tappet; and a hydraulic pressure control portion that transfers hydraulic pressure into the depression so as to move the second tappet upwards or downwards and to the pin so as to engage or disengage the first tappet with the second tappet.

Abstract: The invention proposes a switchable component (1) for a valve train of an internal combustion engine, said component (1) comprising a housing (2) in whose bore (3) an axially displaceable inner element (4) comprising coupling elements (5) is received, said coupling elements (5), for effecting coupling, being able to be brought partially into engagement with an entraining surface (6) of the housing (2), the inner element (4) being biased in outward direction from the housing (2) by a lost motion spring (7), and an (outer) anti-rotation device (11) extending from an outer casing (10) of the housing (2) projects beyond a surrounding structure (12a), the outer anti-rotation device (11) is configured as a C-shaped, thin-walled ring (13) comprising a slit (12), said ring (13) extends after the manner of a clip in an annular groove (14) in the outer casing (10) of the housing (2) parallel to a transversal plane of the component (1) and, for effecting outer anti-rotation, said ring (13) projects with a sickle-like po

Abstract: A switchable component for a valve train of an mternal combustion engine, comprising a housing, a coupling means, an inner element being biased by at least one lost motion spring, a stop means, and an anti-rotation device configured as a thin-walled ring comprising a slit, a rectangular extension projects inwards from a central position from the inner peripheral surface of the ring which extends parallel to a transversal plane of the component on an outer peripheral surface of the housing, the housing comprises an aperture that is complementary in shape to the extension of the ring and said extension extends through said aperture, a counter surface for the extension extends in the form of a longitudinal flattened portion or a longitudinal groove in the outer peripheral surface of the inner element, and the extension extends with a complementary inner surface directly on or into said counter surface.

Abstract: There is provided a slide part used in an environment where there is a lubricant containing a molybdenum compound including a hard protective layer formed on an outermost surface of a substrate of the slide part; in which: the hard protective layer includes mainly carbon, nitrogen, and a metal element; the hard protective layer is composed of a complex of an amorphous carbon body containing nitrogen and a compound crystal of the metal element; the compound crystal is composed of at least one of a metal carbide, a metal nitride, and a metal carbonitride; and a surface hardness of the hard protective layer is 1800 or larger in Vickers hardness.

Abstract: The apparatus of the present invention provides a lash adjuster feed channel for an engine assembly. The engine assembly includes first and second sets of hydraulic lash adjusters responsive to a variation in hydraulic fluid pressure to cause a variation in lift of first and second sets of engine valves respectively operatively connected thereto. The cylinder head defines a first feed passage in fluid communication with the first set of hydraulic lash adjusters, and a second feed passage in fluid communication with the second set of hydraulic lash adjusters. The valve lift of the first set of engine valves is independently variable by controlling the transfer of hydraulic pressure in the first feed passage, and the valve lift of the second set of engine valves is independently variable by controlling the transfer of hydraulic pressure in the second feed passage. A corresponding method is also provided.

Abstract: A hydraulic cam follower for simultaneous actuation of several equal-acting gas-exchange valves, especially for a tappet pushrod valve train of an engine, includes an outer part, whose base forms a cam contacting surface, and from whose head hollow-cylindrical guides extend in the same number as the valves in a direction towards the base. A housing of a hydraulic play compensation element is provided in each guide and sits with its bottom side on an inside of the bottom of the outer part. A concentric pressure piston is guided in a borehole starting from a head end of each housing so it can move axially. A non-return valve is located at a bottom-side base of the piston and a high-pressure space is formed axially between the base and the bottom side of the housing. A reservoir for hydraulic medium is formed between the base and a head end of the piston.

Abstract: A roller pin for carrying a cam roller in a tappet assembly is provided. The roller pin providing reduced run in time and reduced peak and localized contact pressure between the cam roller and roller pin. The roller pin comprises a substantially cylindrical shaft having a length, a first end and a second end. The length extends from the first end to the second end. The shaft includes a plurality of grooves axially spaced apart and extending in a direction being transverse to the length. The plurality of grooves located proximate the first and second ends and extending only partially the circumference of the shaft.

Abstract: The dual valve lifter assembly has a dual valve lift with two hydraulic lash adjusters therein and a guide for orienting and preventing rotation of the dual valve lifter. The guide has four ledges and the dual valve lifter has four flats which mate with the four ledges. The flats and the ledges prevent the rotation of the lifter. One pair of flats and one pair of ledges are spaced the same while the other pair of flats and the other pair of ledges are spaced at a different distance than the first pair of flats and ledges. The difference in the spacing of the pairs of ledges and flats allows for correct orientation of the lifter when mating it with the guide.

Abstract: A valve system includes a first valve provided on an intake or exhaust port; a second valve provided on another intake or exhaust port; a first cam unit on a camshaft, defining first and second lobe heights; and a second cam unit on the camshaft, defining a third lobe height. The first cam unit moves the first valve by a distance of either the first or the second lobe height, and the second cam unit moves the second valve by a distance of the third lobe height.

Abstract: A variable valve lift apparatus according to an exemplary embodiment of the present invention includes an inner body contacting an input cam, an outer body connected with a valve, a lost motion spring disposed between the inner body and the outer body for supplying restoring force to the inner body, a return pin assembly supplying connecting force to the inner body and the outer body, and an operating portion selectively disconnecting the inner body from the outer body.

Abstract: The invention proposes a switchable support element (1) for a valve train of an internal combustion engine, said support element comprising a housing (2) in whose bore (3) an axially displaceable inner element (4) is received, a coupling means (6) extending in the inner element (4) can be brought partially into engagement with an entraining surface (7) of the housing (2) for achieving coupling, and said support element (1) further comprising at least one vertical stop means (10) that overlaps an annular groove (9) between the inner element (4) and the housing (2) for defining a coupling position of said coupling means (6) with coupling lash relative to said entraining surface (7), the vertical stop means (10) is constituted by at least one thin-walled ring comprising a slot (11), the ring is placed or slipped, slot (11) ahead, onto an outer peripheral surface (12) of the housing (2) to extend parallel to a transverse plane of the support element (1), the housing (2) comprises at least one aperture (13) throug

Abstract: A variable tappet includes a tappet body; a variable portion in the tappet body, configured to open and close a valve; and a control portion to maintain the variable portion in either a first state, at which it can open and close the valve, and a second state, at which it cannot open and close the valve.

Abstract: The low profile valve lifter assembly has flats inside the bore of the outer housing and walls are formed and extended down from the plate of the guide such that the walls align with the flats of the bore to prevent rotation of the lifter with the guide. A groove and protuberance are provided in the flats and on the side wall of the guide in order to properly orient the lifter with the guide. The flats can be connected to form a pocket and the walls of the guide can be connected to form a sleeve that mates with the pocket.

Abstract: An internal combustion engine is equipped with a variable actuation system for the intake valves, including a chamber of fluid under pressure interposed between the intake valve and the respective controlling cam, and a solenoid valve whose opening causes the pressure chamber to discharge such as to determine the rapid closure of the valve by effect of the respective biasing spring means, even when the respective cam would tend to keep the valve open. The variable valve operation system is used in combination with the use of cams controlling the intake valves shaped in such a manner as to give rise to an intake valve lift profile including a boot portion at substantially constant lift.

Abstract: A switchable component (1) for a valve train of a combustion engine is provided, such as a roller tappet, with a housing (2), in whose borehole (3) an inner element (4) runs that can move relative to the housing in the axial direction. At least one coupling element (6) is allocated to the inner element (4), wherein this coupling element, in the decoupled case, lies with its outer end (7) directly in front of an annular surface (8) between both components (2, 4) and, in the coupled case, engages in some sections with a driver surface (9) in the borehole (3) of the housing (2), and wherein, between the components (2, 4) there is a lost-motion spring element (10) forcing these components away from each other in the axial direction. As the coupling element (6) there is at least one sickle-shaped ratchet that can pivot outward and that sits at least indirectly in an opening (11) in the outer shell (5) of the inner element (4) and that is connected to the inner element (4) in an articulated way at one end (12).

Abstract: A variable valve lift apparatus includes a lift body that contacts a cam and a valve. The lift body has a first hole for receiving hydraulic pressure and a second hole for exhausting the hydraulic pressure. A spring is provided in the lift body. A hydraulic pressure supplying portion supplies the hydraulic pressure to the first hole, and a hydraulic pressure exhausting portion receives the hydraulic pressure from the second hole.

Abstract: A variable valve lift apparatus according to an exemplary embodiment of the present invention may include an outer part, an inner part disposed in the outer part and connected to a valve, a latching part that is disposed in the outer part and selectively connects the outer part and the inner part, a camshaft supplying torque, a low lift cam that is configured to the camshaft and selectively supplies torque to the inner part, and a high lift cam that is configured to the camshaft and supplies torque to the outer part.

Abstract: The present invention relates to a mounting module in which an oil control valve for tappet control is mounted in a cylinder deactivation engine. The mounting module of the invention is separately fabricated and coupled to the cylinder head and has various oil passages connecting the oil paths between the oil control valve and the cylinder head with each other and thereby the die structure for molding the cylinder head is simplified. Because of its separately fabricating process it is possible to design the part freely and in a small size and to reduce the cost of die, material, manufacturing and its weight as well. Furthermore, the number of related parts such as steel ball, taker plug, etc. and unnecessary portions in the shape are considerably reduced, thus providing an optimized structure and reducing the manufacturing cost as well as its weight.

Abstract: The liquid is sealed in the lash adjuster so that the volume “V1” of the gas, in the reservoir chamber when the lash adjuster is being produced and the plunger protrudes from the body, is equal to or more than 1.24 times as great as the sum of the volume “Vo1” of the liquid discharged from the high-pressure chamber when the plunger moves downward, and the increase “Vo2” in the volume of the liquid that expands, due to heat, when the temperature of the gas in the reservoir chamber is increased from the production temperature to the maximum use temperature, and the ratio of “V1” to “Vo1+Vo2” is equal to or higher than a ratio, which is derived based on the production temperature and the maximum use temperature, when the inner pressure of the lash adjuster increases by 500 kPa at maximum.