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: The antirotational, mechanical lash control mechanism for two reciprocating bodies having opposing cylindrical surfaces uses a radial U-shaped groove in the outer surface of the outer housing; a radial cut in the leg of said U-shaped groove, that extends from the groove into said bore; a U-shaped clip adapted to fit the U-shaped groove, the U-shaped clip having a ledge on a leg of U-shaped clip, where the ledge extends through said cut and into said bore; and a first stop on the outer surface of the inner housing, such that the first stop abuts said ledge to control mechanical lash between the outer housing and the inner housing. To prevent rotation, the ledge has a flat surface that mates to a flat surface on the inner housing.

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

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

Abstract: A switchable bucket tappet for a valve drive of an internal combustion engine, which has a bucket basic body with a ring-like base. A hollow-cylindrical projection protrudes from an inner edge of the base, and in the bore of the projection an inner body extends. Two coupler pistons lie opposite one another and, to achieve full valve stroke, engage in sections with a driver surface of the bucket basic body which run in a radial hole of the inner body. A zero valve stroke is achieved when the coupler piston is displaced completely into the radial hole of the inner body, which is baseless and free of contact with a cam. The projection has a window-like aperture, with the underside acting as the driver surface for an upper side of the coupler piston during coupling. The region of the base is an approximately symmetrical and continuously thin-walled formation.

Abstract: A switchable component (1) of a valve train of an internal combustion engine is provided, with a housing (2) in whose borehole (3) an inner element (4) is held so that it can move telescopically. At least one coupling piston (7) guided by an anti-rotation locking device (6) is located in a radial borehole (5) of the inner element (4) in a decoupled case, with a section (10) that is flattened in some areas being provided on the coupling piston on one axial side (9) starting from its outer end (8). The borehole (3) of the housing (2) has a window (11) with a complementary engagement surface (12) against which, in a coupled case, the coupling piston (7) can be displaced with its flattened section (10) when passing through the cam base circle. An edge (13) between the outer end (8) and the flattened section (10) of the coupling piston (7) is provided with a bevel (14) that is a surface section of an ellipsoid whose longitudinal axis runs parallel to the flattened section (10).

Abstract: A tappet (1), either for a high-pressure fuel pump or for a valve train of an internal combustion engine, with a housing (2) whose driven side (3) used for a contact of a tappet-following part forms a contact on a bottom side (4) of a bridge part (6) projecting through an inner casing (5) of the housing (2). An anti-rotation locking device (10) projects past the outer casing (8) of the housing with a first cylinder section (9) and sits in a window (7) of the housing (2), with this anti-rotation locking device (10) being provided as a cylindrical element, and tab-like projections (13) project from peripheral walls (11) of the window (7) and the anti-rotation locking device (10), standing “loose” in the window (7), snaps behind these projections.

Abstract: An improved deactivation hydraulic lash adjuster wherein the prior art lost motion spring or springs formerly located within the body of the DHLA and below the pin housing are either omitted completely or are reduced in length, spring force, and/or number and are augmented hydraulically, allowing a shorter, more compact lifter body and reduced overall lifter length. The prior art lost motion spring chamber becomes a hydraulic chamber connected to a new pressurized oil supply gallery containing an accumulator in the engine. An embodiment having no lost motion spring and solely hydraulic lost motion return can be even shorter than a spring-hydraulic hybrid because the potential hydraulic pressure to be brought against the pin housing is not a function of the length of the lost motion chamber, which length is limited only by the required displacement of the pin housing.

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 internal combustion piston engine comprising at least one cylinder head, said cylinder head closing at least one cylinder, inlet and outlet channels of said cylinder head being regulated, each one, by at least one inlet and outlet valve that is loaded by a closing spring, said inlet and outlet valves being activated by roller tappets (1) driven by cams of a camshaft and, if appropriate, by further transmission elements, said roller tappets (1) comprising at ends oriented away from rollers (7) of the roller tappets, two flattened portions (2) that are arranged substantially parallel to each other while being operatively connected to two matching inner surfaces (9) of an anti-rotation bridge (10) made typically of plastic, a spacing dimension of said flattened portions (2) at least partially overlapping a distance between said inner surfaces (9) and, starting from a mounting position of the roller tappet (1) in the anti-rotation bridge (10), an adjustment between the flattened portions.

Abstract: The object is to provide a lash adjuster that can be easily and repeatedly mounted on a swing arm type valve gear, having an adjusting screw that can be repeatedly held in a pushed-in state with a general-purpose turning tool such as a wrench. A serrated internal thread 24 is formed on the inner circumferential face of a cylindrical body 21 having closed bottom end, and a serrated external thread 26 formed on the outer circumferential face of an adjusting screw 25 engages with the internal thread 24. A return spring 27 is mounted in the body to bias the adjusting screw 27 in the protruding direction. A friction member 31 is provided between the bottom faces of the adjusting screw 25 and the body 21. A spherical pivot portion 32 is formed on the top of the adjusting screw 25, and an engaging hole 33 is formed in the top end of the pivot portion 32.

Abstract: A valve lifter guide mountable in the engine block of an internal combustion engine, the valve lifter guide comprising at least one elongated socket defining a longitudinal axis, the at least one socket dimensioned to receive a valve lifter therein, and at least one tab projecting away from the valve lifter guide along an axis which is non-parallel to the longitudinal axis of the at least one socket. The at least one tab includes a projection thereon which is dimensioned to be received in an opening provided in the engine block. The tab further defines a surface, oriented in a plane generally perpendicular to the orientation of the projection, which is capturable between the engine block and cylinder head.

Abstract: The movable element of a solenoid valve is displaced by means of application to the solenoid of alternating phases at constant voltage and at zero voltage, so as to give rise to an alternation of phases of charging and discharging of the solenoid (switching), corresponding to increases and decreases of current around a substantially constant current value. The alternating phases at constant voltage and at zero voltage are controlled so that the phase at constant voltage is maintained for a pre-set time and the phase at zero voltage is terminated when the decreasing current reaches a pre-set value. Alternatively, it is possible to envisage that the phase at constant voltage will be terminated when the increasing current reaches a pre-set value and the phase at zero voltage is maintained for a pre-set time, or else again that both the phase at constant voltage and the phase at zero voltage will be terminated when the increasing current or decreasing current reaches a pre-set value.

Abstract: A device for switching activation of a hydraulic valve play equalization element for setting of a maximal stroke or a zero stroke on a valve of an internal combustion engine, has a switching element for locking and unlocking the housing of the valve play equalization element relative to a guide that is axially displaceable therein. The switching element is a switching ring that surrounds the housing, on which a linkage for rotating the switching ring relative to the housing is disposed. The linkage of the switching ring is connected via a guide element with a groove on the circumference of a rotatable adjustment shaft. The groove has a groove section demonstrating an axial incline, and in which the switching ring is rotated, to implement a switching process via the guide element during rotation the adjustment shaft.

Abstract: A cam housing 3 in accordance with the present invention includes: a body portion 4 that is provided separately from a cylinder head 1, supports a camshaft 2 for driving a valve 10 provided in the cylinder head 1, and is fixed to the cylinder head 1; a sub housing 20 that includes a mounting concavity 21 for mounting a lash adjuster 18 and is fixed to the body portion 4 with a mounting face 20A thereof forced against an outer face of the body portion 4, the mounting face 20A being different from the face wherein an opening of the mounting concavity 21 is provided; and an air vent 22 that penetrates the sub housing 20 between a wall surface thereof and the mounting face 20A thereof and thereby is provided in the sub housing 20, the wall configuring an inner space formed in the mounting concavity wherein the lash adjuster 18 is mounted.

Abstract: A deactivating hydraulic lash adjuster comprising a pin housing slidably disposed in a body and having at least one lock pin disposed in a transverse bore for extending into a receiver feature in the body to lock the two together during periods of engine operation in valve non-deactivation mode. The present improvement consists in providing a first orienting feature for the lash adjuster body that engages a second orienting feature on an engine head to provide a preferred and fixed orientation of the body within a bore in the engine head. In a currently preferred orientation, the axis of the at least one lock pin is parallel to the axis of the engine camshaft. The orientation of the lock pin(s) to the body is made invariant by insertion of a pin through a radial bore in the body into a longitudinal groove in the pin housing.

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 lash adjuster is provided which includes a cylindrical housing having an open top and formed with an internal thread on an inner periphery thereof, a screw rod having an external thread formed on an outer periphery thereof and in threaded engagement with the internal thread, and a spring biasing the screw rod outwardly of the housing. Each of the internal thread and the external thread having a pressure flank configured to receive pressure when a force that tends to push the screw rod into the housing acts on the screw rod, and a clearance flank having a smaller flank angle than the pressure flank. The screw rod has an end protruding from the housing and configured to support an arm of a valve operating mechanism so as to be pivotable about this end. Oil film expelling grooves are formed in the pressure flank of the external thread, using a tap having a thread that extends so as to cross the internal thread.

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: This invention is to provide a tappet clearance adjusting cover coupled with a secondary air valve. The tappet clearance adjusting cover is disposed on a cylinder head of an engine. The secondary air valve includes a recessed element and a cap which jointly form a receiving space receiving therein a one-way valve. The recessed element is provided with an inlet pipe interposed between the cap and the tappet clearance adjusting cover. By disposing the secondary air valve on the tappet clearance adjusting cover and arranging the inlet pipe between the cap and the tappet clearance adjusting cover, with the one-way valve received in the receiving space of the secondary air valve, heat dissipation can be improved while the one-way valve is protected against premature deterioration and carbon deposition caused by a high-temperature exhaust gas from the cylinder head. Thus, reliability as well as a service life of the one-way valve is effectively increased.

Abstract: The present invention provides a valve lifter, including a buffer layer, a Me diamond-like carbon layer having a thickness of 0.3˜0.6 ?m, and a diamond-like carbon layer having a thickness of 1˜1.5 ?m and a SP3 bonding fraction of 60˜70%, which are sequentially formed on a base body which is subjected to carbonitriding treatment. The valve lifter can exhibit superior low-friction characteristics and wear resistance.

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: 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: 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 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 return spring is formed using a compression coil spring that is installed so that its axial direction is an up-down direction. The return spring is provided in a high-pressure chamber, and powers a plunger in an upwards direction. A coil diameter of the return spring varies along the axial direction. When the return spring is in a maximally compressed state, an axial direction dimension (up-down direction dimension) is smaller than a dimension that is a thickness of a spring wire multiplied by the number of coil turns. Hence, an overall height of a lash adjuster A can be reduced in comparison to when a return spring with a constant coil diameter over an entire length is used.

Abstract: A switchable component, which has a housing with a bore and an inner element held in the bore with a head that projects above a rim of the housing. The housing and the inner element are loaded away from each other by a lost-motion spring. At least one coupling piston sits in an opening of the inner element. Sections of the coupling piston are moveable over a ring surface to a carrier surface of the housing. A retaining ring packet has a circular arc-shaped outer surface that lies in a ring groove of the bore of the housing. A ring face of the inner element sits against the underside of the retaining ring packet in the extended state defining relative position. The retaining ring packet, starting from at least one of the surfaces of the retaining ring packet has recesses for forming tab-like sections lying circumferentially between the recesses.

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 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: 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: 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 sealed type lash adjuster (100A) includes a plunger (2A), a body (1) in which the plunger (2A) is inserted in a fitting manner, a first sealing means (5) provided between the plunger (2A) and the body (1), and a second sealing member (20A) that can prevent or suppress intrusion of an engine oil from an outside. The second sealing means (20A) seals a portion of the plunger (2A) exposed from the body and is arranged so as to cover a clearance (K) formed between an open end portion of the body and the plunger (2A). More specifically, the second sealing member (20A) has a one-end portion (20aA) and an other-end portion (20bA) as sealing parts having a function of preventing or suppressing intrusion of the engine oil from the outside.

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: An oil system for selectively deactivating valves for specified cylinders of an internal combustion engine includes a cylinder head having a lash adjuster oil passage and a cylinder deactivation oil passage. Plugs are coupled to the cylinder head separating the cylinder deactivation oil passage into separate portions. A clearance between a portion of each plug and the head allows a controlled flow of oil to pass from the lash adjuster oil passage to the cylinder deactivation oil passage to purge air from the cylinder deactivation oil passage. A valve is operable to selectively supply pressurized oil to the cylinder deactivation oil passage to deactivate the specified cylinders.

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 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: 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: An actuating system for a gas exchange valve of an internal combustion engine is described which comprises two cams (12,14) associated with the valve (10), a summation linkage (22,24,30,32) for lifting the valve in dependence upon the sum of the instantaneous lifts of the two cams (12,14). A de-activating mechanism 34 is provided for selectively decoupling the summation linkage from one (12) of the two cams.

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: 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: 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: 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 high performance overhead valvetrain assembly includes a hydraulic lash adjuster which is received within and supports a trunnion. The trunnion, in turn, is received within a cylindrical passageway in one end of a rocker arm. The opposite end of the rocker arm engages a valve stem. Between the trunnion and the valve stem is a roller adapted the engage a cam of a camshaft. The trunnion stabilized rocker arm permits significantly increased valve lift and improved engine performance.

Abstract: A method of variable valve timing in an internal combustion engine in which the valve opening and closing timing of the actuated gas exchange valves of the internal combustion engine can be varied as a function of engine speed by adjusting means for adjusting at least one camshaft relative to a crankshaft, said internal combustion engine comprising hydraulic valve lash adjusters for adjusting a valve lash of the gas exchange valves, said lash adjusters being configured at least on one of an inlet side and an outlet side as idle stroke elements which, when actuated, at first produce an engine speed-dependent idle stroke and to provide a method of variable valve timing for internal combustion engines comprising a camshaft adjustment and a hydraulic valve adjustment with an idle stroke function that guarantees favorable valve timing in all operational situations of the internal combustion engine and, at the same time, improves the thermodynamic exploitation of such internal combustion engines, at each adjustment

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 system and method for lash adjustment in the valvetrain of an internal combustion engine include a hydraulic lash adjuster having a damping device to limit rate of movement of a plunger relative to a body to control response time of the lash adjuster reducing or eliminating over-compensation or pump-up of the lash adjuster.

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: 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: A lash adjuster is provided in which the friction coefficient between the pressure flanks is less likely to decrease over a long time use. The lash adjuster 1 includes a nut member 10 having an internal thread 17 on its inner periphery, an adjusting screw 11 having an external thread 18 on its outer periphery which is in threaded engagement with the internal thread 17, and a return spring 12 biasing the adjusting screw 11 in a direction to protrude from the nut member 10, the external thread 18 and the internal thread 17 having pressure flanks 19 and 21, respectively, for receiving an axial load that tends to push the adjusting screw 11 into the nut member 10, wherein a satin finished surface is formed on the pressure flank 19 of the external thread 18, and the satin finished surface has a higher surface hardness than the pressure flank 21 of the internal thread 17.