Abstract: A variable valve drive for changing control timing of cam-actuated gas-exchange valves of an internal combustion engine is provided, with a tappet (6a, 6b, 6c), which, with convex cam engaging contour (5), engages a cam (4a, 4b, 4c) of a camshaft (3a, 3b, 3c) and which is guided so that it can move in the longitudinal direction in a rotatable tappet guide (7a, 7b, 7c), whose rotational angle (9) is adjustable for changing the control timing. In this way, the tappet guide (7a, 7b, 7c) can rotate about a rotational axis (8) parallel to a longitudinal axis (2) of the camshaft (3a, 3b, 3c).

Abstract: A valve actuator for operating a gas exchange valve of an internal combustion engine has a sleeve-shaped positioning piston which is connected to a valve stem, has at least two shell-shaped wedge pieces enclosing a stem end of the valve stem, whose radially outer peripheral surfaces have a conical segment which tapers off with increasing distance from the gas exchange valve and which is at least partially surrounded by a conical clamping sleeve having a mating conical inner surface and is connected to the positioning piston. The wedge pieces are axially form-fittingly and rotatably connected to a threaded bolt. A threaded segment is provided on the threaded bolt via which the wedge pieces and the conical clamping sleeve are axially attachable to one another.

Abstract: A hydraulic valve lash adjuster with idle stroke function for a valve train of an internal combustion engine, said hydraulic valve lash adjuster comprising a piston (2, 2?, 2?) that is guided for displacement in a piston housing (4) and elastically supported against said housing (4), said piston (2, 2?, 2?) comprising a low pressure chamber (3) that communicates via an axial opening (7) in a piston bottom (8) with a high pressure chamber (5) defined by the piston housing (4) and the piston (2, 2?, 2?), and further comprising a control valve (9, 9?, 9?, 9??) acting between said pressure chambers (3, 5), said control valve (9, 9?, 9?, 9??) comprising a valve closing body (10, 10?, 10?) that can be brought to bear sealingly against a valve seat (15, 15?) that surrounds the axial opening (7) on a piston body undersurface (18) and is received in an element (12, 12?) that limits a closing body stroke (17), and said control valve (9, 9?, 9?, 9??) further comprising a control valve spring (11) that loads the valve cl

Abstract: In a guide gib for the valve operating mechanism of an internal combustion engine, having holding spaces (12, 13), which are arranged in the gib (8) at intervals one behind the other, for valve tappets, wherein to prevent a valve tappet from rotating about its central longitudinal axis in each case, flattened portions (14, 15) are formed within the associated holding space (12, 13) of the guide gib (8), it being possible for flattened portions of the valve tappet to bear against said flattened portions (14, 15), according to the invention, the guide gib (8) is formed by a plastic support (9) and a plurality of inlay parts (10, 11) which are provided with the holding spaces (12, 13), each of said inlay parts (10, 11) being made of a higher-strength material than the material of the plastic support (9) and being inserted into the plastic support (9).

Abstract: A hydraulic tappet including: a bottomed cylindrical body; a plunger slidably fitted in the body; a check valve mounted at one end of the plunger so that the check valve is interposed between a high-pressure chamber and an oil chamber, the high-pressure chamber being formed between a closed end of the body and one end of the plunger, the oil chamber being formed within the plunger; and a return spring mounted between the body and the plunger to bias the plunger in a direction to increase the volume of the high-pressure chamber. The return spring is disposed outwardly of the body. Thus, it is possible to decrease the volume of the high-pressure chamber to provide a reduction in size of the hydraulic tappet.

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 hydraulic valve play compensation element for an internal combustion engine is provided as a reverse-spring/free-ball element, with a cylindrical housing, a cylindrical piston (21) guided therein with sealing play and a control valve (20), which is arranged between a low-pressure chamber (22) of the piston (21) and a high-pressure chamber (24) of the housing, on a piston head (25) of the piston and which has a closing body (27), which can contact a valve seat (26) surrounding an axial bore hole (23) of the piston head (25) when carrying out a stroke (28) in the closing direction against the force of a control-valve spring (34) and which can contact a contact surface (29) of a valve cap (30) surrounding the closing body (27) when carrying out a stroke in the opening direction.

Abstract: In a valve timing gear of an internal combustion engine having hydraulic valve clearance adjusting elements (21), each element (21) comprises a rotationally symmetrical housing (22), which is guided so that it is longitudinally displaceable in a seat in the engine and at one axial end of the element (21) is acted upon by a cam of a camshaft. The element (21) comprises a piston (24) which is axially displaceable in the housing (22) and is non-positively connected either directly or indirectly to an engine gas exchange valve. A control valve (31), which has a closing member (39) and a valve seat for this formed on the piston (24), is arranged axially between the housing (22) and the piston (24). A reverse-spring element is used as valve clearance adjusting element (21), that is to say an element the control valve (31) of which comprises a control valve spring (30), which is supported by one end on the piston (24) and by the other end on the closing member (39).

Abstract: Valve lift variation associated with a deactivation roller hydraulic valve DRVHL (DRHVL) can result in unacceptable valve overlap and idle conditions for an internal combustion engine. Two sources of length variation in a DRHVL are leakdown and residual mechanical lash. Total length variation is the sum of these two factors, and each factor has an associated tolerance. In the prior art, the two factors are independent, resulting in a total population variation that is the sum of the two independent variations. A DRHVL assembly process in accordance with the invention includes the step of associating leakdown test results for individual lash adjusters with residual lash results by adjusting the residual lash characteristics of individual DRHVL assemblies to complement the leakdown characteristics in minimizing total length variation in the population of assembled DRHVLs.

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 connection of a bearing bolt (6) in a cylindrical housing (1) of a roller tappet (2) that is actuated in a direction of a longitudinal axis (Z) is provided, especially for a tappet push-rod valve drive of an internal combustion engine. The bearing bolt (6) is supported in bore holes (7) of the housing (1), which extend in a transverse plane (XY) to the roller tappet (2), perpendicular to the longitudinal axis (Z), and is connected with a positive and/or non-positive fit to the housing (1) through material deformation. The material deformation is provided as one or more segments (9, 10), of which at least one segment (9) completely encloses a radial load zone (16) of the bearing bolt (6), and a section (15) of the bearing bolt (6) extending about the transverse plane (XY) is free from material deformation.

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: In hydraulic valve last adjusters for the timing gear of an internal combustion engine comprising cylinder valve lift reversal or deactivation, said adjusters being loaded by cams of one or more camshafts while being made as a combination of switchable lash adjusters (22) and (non-switchable) standard lash adjusters, said adjusters further being configured as reverse-spring adjusters or free-ball adjusters, each adjuster comprising a control valve (32) whose closing body (41) is in the opening position during a base circle phase of the associated cam, according to the invention, the stroke of the closing body (41) of a switchable lash adjuster (22) is smaller in each case than the stroke of the closing body of a standard lash adjuster. This enables the idle strokes of the two different types of last adjusters to be adapted to each other.

Abstract: The present invention relates to a lash adjuster body, comprising A lash adjuster body, comprising an outer surface, enclosing a cavity, wherein the cavity includes an inner surface configured to accommodate an insert and a spring; and the cavity is fabricated through forging.

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. The high-pressure chamber (9) extends axially between the bottom (7) of the pressure piston (3) and a base (10) of the housing (2), and the pressure pistons (3) arranged in the common housing (2) have a common reservoir.

Abstract: The present invention relates to a method for fabricating a roller follower assembly, comprising the steps of fabricating a lash adjuster body, fabricating a roller follower body, fabricating a leakdown plunger, fabricating a socket, wherein at least one of the lash adjuster body, roller follower body, leakdown plunger, and socket is fabricated at least in part by forging.

Abstract: A rail used as a torsional stop for the valve train of an internal combustion engine is disclosed. The rail includes spaces (10) which are arranged in a row spaced apart at a distance from one another within the rail (8) and accommodate inserted valve lifters provided as roller tappets (9). Two parallel torsional stop areas (15) are configured on the outer surface of each roller tappet (9) in the form of planar flattened zones in order to secure the roller tappet (9) against rotation about the central longitudinal axis thereof. The torsional stop areas (15) rest against guide areas of the rail (8), which are located inside the associated accommodating space (10).

Abstract: The present invention relates to a roller follower, comprising an outer surface, enclosing a first cavity, a second cavity, and a transition opening, wherein the first cavity includes a first inner surface configured to house a cylindrical insert the second cavity includes a second inner surface configured to house an inner body, and the transition opening links the first cavity with the second cavity; and at least one of the cavities is fabricated through forging.

Abstract: A valve lifter assembly for deactivating a cylinder in an internal combustion engine. The valve lifter assembly is provided with a plunger movably disposed within a bore of a main body member to controllably isolate the cam lift from the rocker arm and valve of the engine. The plunger is normally locked in an extended position to transmit cam lift to reciprocatingly operate the valve. At least one locking pin is moveably disposed within the plunger to engage an inner annular groove of the main body member. Pressurized oil is provided to dislodge the locking pins from the annular groove and allow the plunger to move within the main body member, thereby isolating the cam lift from the rocker arm and valve. The deactivating lifter is preferably disposed within the recess conventionally provided for hydraulic valve lifters.

Abstract: The invention relates to a hydraulic support element (1) for a valve gear for an internal combustion engine. Said element consists of a cylindrical hollow case (2) in whose bore hole (3) a pressure piston (4) made of a glass or carbon fibre reinforced plastic is arranged.

Abstract: The invention proposes a deactivating element (1) for a valve train of an internal combustion engine. The deactivating element (1) comprises a housing (2) and an inner element (4) that is axially displaceable in the bore (3) of the housing (2). According to the invention, the pistons (7) arranged in the inner element (4) for coupling into an annular groove (12) in the housing (2) possess two flattened regions (10, 15) arranged diametrically opposite each other in axial direction of the deactivating element (1). The height of the annular groove (12) is reduced by a measure of a height of the second, additional flattened region (15). Due to the reduction of height of the annular groove (12), its volume is also reduced. This results in advantages activation and deactivation times.

Abstract: A force-transmitting arrangement (4) for a valve train (1) of an internal-combustion engine (2) is provided with hydraulic valve play compensation device (6) with a hollow cylindrical compensation piston (13). This borders, on one end, a working space (28) of the valve play compensation device (6) and, on the other end, a hydraulic medium reservoir (29), 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). Here, a run-off safety device (27) at least partially prevents a hydraulic medium flow from the hydraulic medium reservoir (29) in the direction of the hydraulic medium supply (23). The hydraulic medium reservoir (29) includes an inner storage space (15) enclosed by the compensation piston (13) and at least one outer storage space (52) located outside the compensation piston (13).

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

Abstract: A hydraulic valve-lash-adjusting element (HVA) for the valve train of an internal combustion engine, wherein: a housing (1) has a blind bore (2) in which a piston (3) is guided with sealing clearance and is in pressure contact with a valve-actuating element (6) and its cam; the piston (3), together with the blind bore (2), defines a high-pressure space (4) while a low-pressure space (5) is located above the piston (3); the pressure spaces (4, 5) are connected by at least one central axial bore in the piston (3), this axial bore being controlled by a control valve arranged in the piston (3), wherein the control valve is designed as an exchange valve (11), with a valve body (12) which is guided in a smooth-running manner in the interior of the piston (3), serves to control an upper and a lower central axial bore (14, 15) and the closing movement in both directions of which is the relative movement of the piston (3) in relation to the valve body (12), which is virtually at a standstill because of its mass mo

Abstract: Disclosed is a drag lever (1) comprising two side walls (2, 3) which are connected together by a transversal bar (4) which is arranged on an end (6) of the lower side (5) thereof on an end (6) thereof on a head of a support element (9) by means of a dome-shaped cavity (7) on a head (8) of a support element (9). A clamp (10) is applied to the end (6) thereof. The clamp fixes the drag lever (1) to the head such that it can be displaced in a pivoting direction thereof. The clamp (10) is made of thin-walled wire material and extends essentially in a transversal manner in relation to the longitudinal axis of the drag lever (1) and is arranged on the lower side (5) of the transversal bar (4) by means of a central section (11) which is formed by webs (12, 13) which extended in a semi-circular manner in a part of the support element (9) which has a reduced diameter (14) and is located below said head (8).

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: The present invention relates to a valve lifter body, comprising an outer surface, enclosing a first cavity and a second cavity, wherein the first cavity includes a first inner surface configured to house a cylindrical insert, the second cavity includes a second inner surface cylindrically shaped, and at least one of the cavities is fabricated through forging.

Abstract: A switch element (1) is proposed for valve shut-off, fabricated as cam follower for a plunger rod valve drive of an internal combustion engine, having an outer part (2) and an inner element (4) axially movable in its bore (3) and with rotational security (15) relative to the guided inner element (4). The outer part (2), inside the bore (3), has an annular groove (6), and the inner element (4) has a radial bore (7) with two diametrically opposed pistons (8), which to couple the elements (2, 4) in their axially remote relative position achieved by a lost-motion spring (5) are displaceable towards the annular groove (6). On their cam-side under side, emanating from their radially outward, bulbous face, the pistons (8) segmentwise comprise a plane transverse surface as contact area for a facing under side (27) of the annular groove (6). The latter is intersected by two diametrically opposed oil ports (11) running offset 90° from the pistons (8) in circumferential direction.

Abstract: The present invention relates to a lash adjuster body, comprising A lash adjuster body, comprising an outer surface, enclosing a cavity, wherein the cavity includes an inner surface configured to accommodate an insert and a spring; and the cavity is fabricated through forging.

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

Abstract: A reverse spring hydraulic valve-lash-adjusting element for the valve train of an internal combustion engine having a plunger (1), in the plunger head (2) of which a control valve (5) is arranged, this control valve (5) controlling a central axial bore (6) which connects a low-pressure space (4), arranged above the plunger head (2), to a high-pressure space (3) arranged below the plunger head (2), the control valve (5) having a valve-closing body (7) which is loaded in the opening direction by a valve-body spring (17) and as a result passes from a cylinder-ring-shaped sealing surface (8) arranged on the plunger head (2) to a travel-limit surface (9) of a center piece (24), whereas the closing of the control valve (5) is effected by displacement of oil from the high-pressure space (3) into the low-pressure space (4) wherein the valve-closing body (7) reaches the sealing surface (8) on a linear path without lateral movement or rotation of said valve-closing body (7) by virtue of the fact that a circular-cylindr

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

Abstract: The invention relates to a hydraulic tappet clearance compensation device (1) for a valve gear of an internal combustion engine, the high pressure chamber (8) of which device can be rapidly and easily vented. For this purpose an annular collar (11) has radial openings (16) distributed over the circumference of its pressure piston (5). These allow air bubbles, which accumulate between an outer shell of the annular collar (11) and a bore (3) of a housing (2), to escape to a bore (9) for a non-return valve (10) and hence directly into the open. There is therefore no need for venting via a leakage gap (13) between the pressure piston (5) and the housing (2), which has hitherto yielded only unsatisfactory results.

Abstract: The present invention relates to a valve lifter body, comprising an outer surface, enclosing a first cavity and a second cavity, wherein the first cavity includes a first inner surface configured to house a cylindrical insert, the second cavity includes a second inner surface cylindrically shaped, and at least one of the cavities is fabricated through forging.

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 combination of tools for use in adjusting the valves in an internal combustion engine, and particularly the movement of the valve contacting end of a rocker arm in a motorcycle engine, comprises a socket, a hollow rod sized to fit in the opening in the top of the socket and a screw driver sized to fit through an upper opening in the rod so that the valve adjustment screw can be adjusted while the locking nut thereon is easily unlocked using the socket.

Abstract: Disclosed is a shim or a valve lifter for an automotive engine valve driving system that slides against a cam lobe of a camshaft to drive an intake/exhaust valve of an internal combustion engine. The shim or lifter has the top of a sliding surface thereof opposing the cam lobe and being coated with a hard carbon film. The hard carbon film has a surface hardness of 1500 to 4500 kg/mm2 in terms of Knoop hardness, a thickness of 0.3 to 2.0 ?m and a surface roughness Ry (?m) satisfying the following equation (A): Ry<{(0.75?Hk/8000)×h+0.07/0.8}??(A) where h is the thickness (?m) of the hard carbon film; and Hk is the knoop hardness (kg/mm2) of the hard carbon film. By imparting durability, reliability and a low friction coefficient to the hard carbon film that is said to be low in ductility to prevent the hard carbon film from becoming cracked and separated when applied to the sliding portion.

Abstract: Valve train with hydraulic lash adjustment in the entire timing train, in which oil is delivered from the oil supply space of the hydraulic valve-lash adjuster (HLA) to the valve rocker arm via a hollow push rod, a choke limiting the oil discharge, the choke being designed in such a way that it seals off the push rod bore at the top when the oil pressure drops, that is to say when the engine is shut off, so that the oil is retained in the push rod bore (12) until—after the engine is started—the choke body (15, 22) opens up the discharge opening again.

Abstract: In a scooter engine having valve lifters (33) interposed between intake valves (16) and a cam shaft (31), as well as between exhaust valves (17) and a cam shaft (32), with its axial line (C) of a cylinder (7) extending toward the front part of the vehicle body, a stopper (42) is provided in the cylinder (7) in the opposite position to a top face (33a) of the valve lifters (33). The top face (33a) of the valve lifters (33) is abutted against the stopper (42) when the valve lifters (33) move to fall off a cylinder head (12) as the cam shaft is removed from the cylinder head (12), thus the valve lifters (33) are prevented from falling off the cylinder (7) by the stopper (42). In this way, the valve lifters (33) are be kept assembled to the cylinder (7) even when the cam shaft is removed during the maintenance work. In other words, the DOHC engine (2) can be installed on a scooter while preventing the valve lifters (33) from falling off in the course of maintenance work.

Abstract: A switchable cam follower (1) or a switchable support element of a valve train of an internal combustion engine, said cam follower or support element comprising an outer part (2) which is assembled together with an inner part (4) that is displaceable relative thereto in a direction of cam lift, said inner part (4) comprising, at a parting gap (5) to the outer part (2), two spaced apart or opposing openings (6, 7) for coupling means, each of said openings (6, 7) being aligned, at one cam position, to a further opening (10, 11) for coupling means in the outer part (2), the coupling means being configured and arranged so that, in a coupled state, each coupling means extends beyond the parting gap (5) on one coupling side (12, 13) while simultaneously extending in the opening (10, 6) of the outer and the inner part (2, 4) which in an uncoupled position of the coupling means (14, 15), an axial idle stroke of the coupling means (15) on the one coupling side (12) till coupling is achieved is large and the axial idle

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: In a lash adjuster of a valve gear which employs a serration-shaped thread mechanism, the formation of a tribochemical reactive film is suppressed by using as the materials for its adjuster screw and nut member (or the materials for their thread surfaces) materials that, even if FM oil is used, the friction coefficient will not extremely decrease. The nut member is provided on the underside of an end plate of a lifter body. The adjuster screw is threadedly engaged in a threaded hole of the nut member. The adjuster screw is biased by a return spring. The female threads of the threaded hole and the male threads of the adjuster screw are serration shaped. One or both of the nut member and the adjuster screw, or the pressured thread surfaces of one or both of them, are formed of a material that will not react with oil additives of FM oil to suppress the formation of tribochemical reactive film, thereby stabilizing the operation of the lash adjuster.

Abstract: The present invention relates to an assembly, comprising an adjusting body, a valve lifter body and means for cold forming at least a portion of at least one of the adjusting body and the valve lifter body. The adjusting body includes an outer surface enclosing a cavity, wherein the cavity includes an inner surface configured to accommodate an insert and a spring. The valve lifter body includes a first end containing a first opening, a second end containing a second opening, and an outer lifter surface that encloses a first and second lifter cavity, wherein at least one of the ends is substantially flat, the second lifter cavity includes a second inner lifter surface that is configured to house the adjusting body, and the first cavity is configured to house a cylindrical insert and includes a first inner lifter surface provided with a plurality of walls that extend from the first opening, a curved surface, a flat surface, and an angled surface that is at an angle with respect to the flat surfaces.

Abstract: The present invention relates to an assembly, comprising a socket body including a forgeable material and provided with an outer socket surface, a first socket surface, and a second socket surface, wherein the outer socket surface is configured to cooperate with the inner surface of an engine workpiece, the first socket surface includes a push rod cooperating surface, and the second socket surface includes a plunger reservoir passage configured to conduct fluid and a curved socket surface that is configured to cooperate with a leakdown plunger.

Abstract: A lash adjuster in a valve actuator includes a lifter body having an end plate having its top surface in contact with a cam and formed with a threaded hole in its bottom surface. An adjuster screw is inserted in the threaded hole with its external thread in engagement with the internal thread of the threaded hole. An elastic member is mounted in the threaded hole over the adjuster screw to bias the adjuster screw axially downward. Both of the threads have a sawtooth-shaped section with its pressure flank having a greater flank angle than its clearance flank. One of the pressure flanks is formed with a satin-finished rugged surface which is covered by a hard film which is non-reactive with a low-friction oil. With this arrangement, even after the threads have become worn, the friction coefficient between the thread surfaces is kept substantially constant.

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

Abstract: An internal combustion engine that has a camshaft having a plurality of cam lobes, a plurality of valves where each of the valves are actuated by a lifter actuated by the camshaft with a cam lobe. The lifter comprises a lifter body having an upper surface and a lower surface. A cam contact plate pivots on an axis on the upper surface of the lifter body. Opposed hydraulic actuators are present on either side of the axis of the cam contact plate, where each hydraulic actuators comprise a fluid chamber in the lifter body, a piston in the chamber, and a spring biasing the piston into contact with the cam contact plate. The lifter further comprises a line supplying hydraulic fluid to the fluid chambers of the hydraulic actuators and a control valve for controlling fluid flow from one hydraulic actuator to the other hydraulic actuator.

Abstract: A valve lifter is disclosed comprising a lifter housing having a receiver, a switch retainer having at least one bore, and a key disposed in the at least one bore. The key is movable into the receiver to lock the switch retainer against movement relative to the lifter housing.

Abstract: The invention proposes a hydraulic support element (1) whose high-pressure chamber (10) is kept substantially free of air bubbles and oil foam. This is realized through a deflecting sleeve (15a) in combination with two vent bores (16) situated diametrically opposite each other on the inner peripheral surface (17) of the pressure piston (5).