Abstract: Disclosed is a cam follower of which the structure is improved such that the limit load can be increased. The cam follower is one which moves relative to a cam, mediated by a liquid lubricant, wherein a plurality of recesses are provided on the contact surface of the cam follower which makes contact with the cam, and the depth of the plurality of recesses of the contact surface is between 0.005 and 0.03 mm. By providing the plurality of recesses on the contact surface of the cam follower which makes contact with the cam, the present invention makes it possible to improve the state of lubrication between the cam follower and the cam which move relative to each other mediated by the liquid lubricant and to reduce the heat and the wear which occur at the interface between the same.

Abstract: A roller tappet having a housing near whose drive side front end, two diametrically opposing flats receding from an outer wall of the housing are arranged, each of the two flats having a seat with a U-shape open in a direction towards the drive side front end. A pin is mounted in the seats, a roller serving as a run-on surface of a periodic stroke producer extends on said pin, and a support for a tappet follower element is seated axially under the roller near a driven side front end of the roller tappet. A retention element is provided for the pin in an axial direction of the pin and a retention element in the seats of the pin is provided for preventing the pin from exiting axially out of the housing, and these two retention elements are united.

Abstract: A lifter guide includes a lifter guide body having an outer surface and an inner surface that extend from a first end to a second end. The inner surface defines at least one push rod passage. A plurality of compression members are provided at the first end. The plurality of compression members project proudly from the first end. The plurality of compression members are configured and disposed to be compressed by a cylinder head to retain the lifter guide in a cylinder block. The lifter guide is devoid of mechanical fasteners.

Abstract: The present invention provides a shim for a valve drive mechanism which is interposed between a pad surface of a rocker arm and a stem end surface of a valve. The shim includes a ship top surface that is contacted by the pad surface. The shim top surface is rotated about a center thereof to be cut, is provided with a center hole at the center thereof, and is shaped such that the pad surface does not contact an intersection line between an inner peripheral surface of the center hole and the shim top surface when the rocker arm is swung.

Abstract: A mechanical bucket tappet (1) for a valve driver of an internal combustion engine having a hollow cylinder-shaped wall (2) which is delimited at one frontal area (3) by a disk-like bottom (4) whose top side (5) is provided as a cam stop face and which comprises a central, funnel-like recess (6), wherein a dome-like one-piece catch (8) aligned with the recess (6) projects from a lower side (7) of the bottom (4), the underside (9) of said catch being used for putting on a valve stem and wherein the funnel-like recess (6) is sealed near or at the top side (5) of the bottom (4), so that the bottom (4) comprises a central encasement (10).

Abstract: A variable valve lift apparatus may include a camshaft, a low lift cam which may be connected to the camshaft and rotates, a high lift cam which may be rotatably mounted to the camshaft and may be selectively connected to the camshaft to rotate with the camshaft, a high lift cam connecting portion which selectively connects the high lift cam to the camshaft, and a tappet including a low lift cam contact portion contacting the low lift cam and a high lift cam contact portion selectively activating the high lift cam.

Abstract: A device for adjusting the camshaft of an internal combustion engine, having a lift profile element (12) which is provided on an axially movable mounted camshaft for conjoint rotation therewith and which provides a control groove, and having a control unit for generating a predetermined axial movement of the camshaft, wherein the control unit has a tappet unit (17) which is movable radially with respect to the camshaft along a movement direction and which is designed for controllable engagement into the lift profile element, and wherein the lift profile element forms a first control groove (16) which is designed to interact with the tappet unit at a first penetration depth so as to describe a first axial movement of the camshaft, and the lift profile element forms a second control groove (18, 22) which is designed to interact with the tappet unit at a second penetration depth, which differs from the first penetration depth, so as to describe a second axial movement, which differs from the first axial movement

Abstract: An assembly for a valve drive of an internal combustion engine, which has a hydraulic support element and a cam follower connected by way of a clamp. The follower rests on one end via a cap on a spherical head of a pressure piston of the support element. The piston extends in a bore of a housing of the support element. The clamp flanks the cap with holding strips along the sides. The inner sides run in a guide zone on the outer shell of the piston. The housing has an opening for hydraulic fluid that can be conducted between the housing and the piston through at least one passage in the piston to a storage chamber. The guide zone on the piston is also designed as an anti-rotation mechanism therefore. The piston is installed in a defined manner and is torsionally oriented in relation to the cam follower.

Abstract: A cylinder head assembly for an internal combustion engine having an intake cycle and an exhaust cycle is provided. The cylinder head assembly includes a single valve, a cylinder head body, and a venturi tube. The cylinder head body has an intake port, an exhaust port, and a combustion chamber port configured to intermittently seat the single valve. The venturi tube is disposed within the cylinder head body and has a high pressure portion operably coupled to the cylinder head body proximate the intake port and a distal end spaced apart from the combustion chamber port. The venturi tube permits the intake port to remain in fluid communication with the exhaust port during both the intake cycle and the exhaust cycle of the internal combustion engine.

Abstract: An engine comprises a system for variable actuation of the intake valves and is subdivided into a plurality of sub-systems independent with respect to each other, carried by a plurality of respective elements, each mounted on the cylinder head at a respective engine cylinder. Among other things, this considerably facilitates the system maintenance operations.

Abstract: A lifter guide includes a lifter guide body having an outer surface and an inner surface that extend from a first end to a second end. The inner surface defines at least one push rod passage. A plurality of compression members are provided at the first end. The plurality of compression members project proudly from the first end. The plurality of compression members are configured and disposed to be compressed by a cylinder head to retain the lifter guide in a cylinder block. The lifter guide is devoid of mechanical fasteners.

Abstract: A valve operating mechanism includes a pin housing housed in a lash adjuster and a lash adjustment chamber. A sync pin is slidably received within the housing between an activating position and a deactivating position. A ball valve assembly is provided within the housing for communication with the chamber, and is moveable between an open position and a closed position. The valve operating mechanism is operable in an active mode and a deactive mode. In the active mode, the sync pin is in the activating position, a valve is in an active state and the valve operating mechanism is configured to adjust valve lash. In the deactive mode, the sync pin is in the deactivating position and the valve is in a deactive state. The valve operating mechanism is configured to generate valve lash to allow the operating mechanism to move between the active mode and the deactive mode.

Abstract: A structural assembly (1) for a high pressure fuel pump, with the structural assembly (1) having a tappet (3) connected to a pump piston (2), which bears frontally against a contact surface (7) of an inner side (8) of the bottom (5) of the pump piston (2), the bottom (5) being connected to a guide skirt (10) of the tappet (3). An outer peripheral wall (11) of the pump piston (2) is surrounded near the inner side (8) with radial lash by a bore (12) of a spring plate (13) on whose bottom-distal side (14) a coil compression spring (15) bears for resetting the pump piston (2), and a bottom side (16) of the spring plate (13) is situated opposite an annular surface (17) of an entraining collar (18) on the pump piston (2). The entraining collar (18) is a separate, disk-like element seated on the pump piston (2) with slight axial distance to the spring plate (13), which spring plate (13) possesses a disk section (19) with the bottom side (16) having the bore (12).

Abstract: A tappet (10) is movable along an axis. The tappet (10) includes a skirt defining an opening (18) and an alignment device (22) positioned at least partially within the opening (18). The alignment device (22) has a generally T-shaped cross-sectional shape when taken through a plane substantially parallel to the axis and has a non-T-shaped cross-sectional shape when taken through a plane substantially perpendicular to the axis.

Abstract: A roller lifter for internal combustion engines is provided, which has higher rigidity of the lifter body, prevents cocking in the cylinder, and can achieve a size reduction. The roller lifter includes a cylindrical lifter body having a sliding surface on an outer circumferential surface thereof and a roller rotatably attached to the lifter body via an axial support pin and making contact with a rotating cam lobe. The lifter body includes a pair of support portions supporting the axial support pin. The axial support pin is mechanically fastened to the pair of support portions, with both ends thereof inserted in support holes formed in the support portions. The lifter body includes an anti-rotation retainer extending radially outward from the sliding surface. The sliding surface is formed on both front and rear sides in the sliding direction of the anti-rotation retainer.

Abstract: The invention concerns a roller tappet (1) for a high pressure fuel pump, said roller tappet (1) comprising a housing (2) comprising on a drive side front end (3), a slide-mounted roller (4) serving as a running surface of a cam, said housing (2), as viewed in housing direction, comprising a bridge member (5) arranged below the roller (4), said bridge member (5) comprising on a front end (7) turned towards a driven side front end (6) of the housing (2), a support (8) for a tappet follower member, wherein a shell member (11) like a semi shell or a one-third shell separated out of a rolling bearing ring is seated in a cylindrical cavity (9) of a further drive side front end (10) of the bridge member (5), and the roller (4) extends for sliding displacement directly in said shell member (11).

Abstract: A valve system for providing closing force to one or more valves of an engine is provided. In one example, the system comprises a first tappet bore in fluid communication with a second tappet bore via a bidirectional oil passage. The system may provide valve closing forces to assist in the closing of valves coupled to the tappet bores, lowering required valve spring forces.

Abstract: A hydraulic pressure valve apparatus includes a housing of which a first chamber and a second chamber are formed therein, wherein a diameter of the second chamber is bigger than that of the first chamber, a first piston disposed within the first chamber, an elastic portion disposed within the first chamber for elastically supporting the first piston and a second piston disposed within the second chamber and connected to a valve.

Abstract: A cold-formed flat top plunger blank is provided for use in a hydraulic lash adjuster. An end wall at the first end of the plunger body defines a flat top surface that is cold-formed to final dimensions or net shape. The flat top surface at the first end of the plunger body is configured to engage a flat surface within the mating bore of an engine cylinder head. By configuring the plunger body to have a flat top surface that engages a flat surface disposed within the mating bore of an engine cylinder head, the force applied to the engine block by the lash adjuster is distributed more evenly, minimizing wear. The external flat top plunger is a unitary component cold-formed to near net shape, including cold-forming to final dimensions the flat top surface and a counterbore.

Abstract: A variable valve lift apparatus may include a variable valve lift housing, a master piston which is slidably disposed in the variable valve lift housing and contacts a cam, a slave piston which is slidably disposed in the variable valve lift housing, defines an oil chamber with the master piston therebetween, and opens a valve connected to the slave piston according to reciprocative motion of the master piston, and a lift control portion which supplies oil to the oil chamber or exhausts oil in the oil chamber selectively to control a relative distance between the master piston and the slave piston.

Abstract: A roller seating device has a hollow-cylindrical element (1) in which a roller (4) is received in seats (8, 10) perpendicular to a center axis (6) of the hollow-cylindrical element (1). A securing element (12) is configured and arranged to couple in a form-fit to the hollow-cylindrical element (1) in the interior (14) of the hollow-cylindrical element (1) in a direction that is axial and rotatory with respect to the center axis (6) of the hollow-cylindrical element (1) and in such a manner as to fix the roller (4) on its faces (16, 18) axially to the center axis (6) of the roller (4).

Abstract: A roller tappet having a housing near whose drive side front end, two diametrically opposing flats receding from an outer wall of the housing are arranged, each of the two flats having a seat with a U-shape open in a direction towards the drive side front end. A pin is mounted in the seats, a roller serving as a run-on surface of a periodic stroke producer extends on said pin, and a support for a tappet follower element is seated axially under the roller near a driven side front end of the roller tappet. A retention element is provided for the pin in an axial direction of the pin and a retention element in the seats of the pin is provided for preventing the pin from exiting axially out of the housing, and these two retention elements are united.

Abstract: Abrasion resistance is further enhanced in a sliding member used in an internal combustion engine. With respect to a valve lifter 6 used in an internal combustion engine 100, hard particles having higher hardness than the valve lifter 6 are dispersed onto the top face 61 of the valve lifter 6, and a nitriding treatment is conducted on the top face 61 dispersed with the hard particles.

Abstract: A roller lifter assembly has a lifter body with a leg extending outwardly therefrom, a bar having a elongated slot formed therein, a first rivet having a head and a shank, a button affixed to the shank of the rivet so as to sandwich the bar between the button and the leg of the lifter body. The head of the rivet has a surface adjacent to the shank that bears against a curved inner surface of the leg of the lifter body so as to prevent the rivet from rotating. The shank extends through the hole in the leg and through the elongated slot of the bar. The rivet is positioned so as to as to be non-rotatable during the movement of the lifter bodies.

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: The present invention may be used for vehicle engines having bores in which roller valve lifters reciprocate. A roller valve lifter may have a body with two opposed subtending spaced apart legs. A cam follower roller bearing having a press fit inner sleeve bushing may be rotatably mounted on the pin. Each of the legs may have an oil feed hole that traverses from an exterior surface to an interior surface adjacent to the inner sleeve bushing. The body in an upper portion may have a key device or an attached vertical guide bar to maintain proper orientation of the roller valve lifter to a cam lobe.

Abstract: A common rail fuel pump includes a cam shaft with at least one cam rotatably supported in a pump housing. A plurality of tappet assemblies are each reciprocatingly movable in the pump housing, and include an axle pin mounted in a tappet, and a roller mounted in contact for rotation about the axle pin. Each end of the roller includes a plurality of non-contiguous planar thrust surfaces separated by lubrication grooves. A lubrication pathway for the roller includes in sequence a lubrication passage that opens to a roller bearing surface, movement along the roller bearing surface into the lubrication grooves, and then between the planar thrust surface of the roller and a counterpart thrust face of the tappet responsive to rotation of the roller on the cam shaft.

Abstract: An electro-hydraulic variable valve lift apparatus may include a valve unit housing of which a guide protrude portion is formed therein, a main piston which is slidably disposed in the valve unit housing and defines a valve adjusting oil chamber with the valve unit housing, a main spring which is disposed within the valve adjusting oil chamber and elastically supports the main piston on the guide protrude portion, a dependent piston which is slidably disposed within the valve unit housing, is guided along the guide protrude portion, reciprocates according to reciprocation of the main piston, and opens a valve, and a main oil supply portion which selectively supplies hydraulic pressure to the valve adjusting oil chamber.

Abstract: A cylinder head including a dam defining a reservoir surrounding the periphery of the fuel pump tappet/roller follower mounting hole is provided. The cylinder head includes a tappet/roller follower mounted in the tappet/roller follower mounting hole and in communication with a cam and a fuel pump. The fuel pump is located on the high side of the head and oil drainage occurs in a direction away from the mounting hole. The dam and reservoir are configured to retain lubricant in the mounting hole and the sliding interface between the mounting hole and the tappet/roller follower. The dam and reservoir are configured to retain a minimum level of oil in the mounting hole when the head is in vehicle position. A method is provided for retaining lubrication in the tappet/roller follower hole by forming a dam defining a reservoir in the head and passively providing lubricant to the tappet/roller follower hole.

Abstract: A valve lift mechanism may include a housing member and a plunger. The housing member may define a first annular wall including a first oil passage. An inner circumference of the first annular wall may define a first continuous region along an axial extent corresponding to the first oil passage from a first location on the inner circumference and circumferentially offset from the first oil passage to a second location on the inner circumference. The plunger may be located within the housing member within the first annular wall. The plunger may define a second annular wall including a series of apertures axially aligned with the first oil passage and separated from one another by an outer circumferential region of the second annular wall. The outer circumferential region may abut the first continuous region of the first annular wall to inhibit oil flow past the outer circumferential region.

Abstract: A mechanical bucket tappet (1) for a valve driver of an internal combustion engine having a hollow cylinder-shaped wall (2) which is delimited at one frontal area (3) by a disk-like bottom (4) whose top side (5) is provided as a cam stop face and which comprises a central, funnel-like recess (6), wherein a dome-like one-piece catch (8) aligned with the recess (6) projects from a lower side (7) of the bottom (4), the underside (9) of said catch being used for putting on a valve stem and wherein the funnel-like recess (6) is sealed near or at the top side (5) of the bottom (4), so that the bottom (4) comprises a central encasement (10).

Abstract: A lifter retainer including a central body portion connected to both a left bank of lifter retaining arms and a right bank of lifter retaining arms. The lifter retainer may be adapted to engage a key portion of one or more lifters to prevent the lifters from rotating during engine operation.

Abstract: A variable tappet may include an outer tappet body, an inner tappet body that is slidably disposed within the outer tappet body and selectively connected with the outer tappet body, a lost motion elastic member that is disposed within the outer tappet body and elastically supports the outer tappet body, and a connecting unit that is slidably disposed within the inner tappet body and selectively connects the outer tappet body and the inner tappet body.

Abstract: In a turbo-charged gasoline engine the opening profile of each intake valve, defined by the opening and closing moments and by the lift, or by the opening stroke of the intake valve, is varied according to the engine operating conditions, so as to reduce or completely eliminate the intervention of a “waste-gate” valve and ensure that in each engine operating condition each cylinder processes only the quantity of air necessary for optimal combustion, with an air/gasoline dosage value close to the stoichiometric ratio.

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 invention concerns a roller tappet (1) for a high pressure fuel pump, said roller tappet (1) comprising a housing (2) comprising on a drive side front end (3), a slide-mounted roller (4) serving as a running surface of a cam, said housing (2), as viewed in housing direction, comprising a bridge member (5) arranged below the roller (4), said bridge member (5) comprising on a front end (7) turned towards a driven side front end (6) of the housing (2), a support (8) for a tappet follower member, wherein a shell member (11) like a semi shell or a one-third shell separated out of a rolling bearing ring is seated in a cylindrical cavity (9) of a further drive side front end (10) of the bridge member (5), and the roller (4) extends for sliding displacement directly in said shell member (11).

Abstract: A switchable cup tappet for a valve timing mechanism of an internal combustion engine, which has a cup basic body with an annular base loaded by large-lift cams. A hollow-cylindrical projection protrudes from an inner edge of the base and an inner body extends in the hole of the projection. The disc-like base is contacted by a small-lift cam. In a hole of the inner body two coupler pistons are coupled in sections with a driver surface of the cup basic body for a large valve stroke. The small stroke occurs by complete displacement into the radial hole. An annular web, spaced from its end faces at both ends, is attached integrally, in which the radial hole extends with the coupler pistons. The driver surface for the pistons is formed by a lower edge of the projection, which is spaced from the bases.

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 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: 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: 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: Cam follower roller device, notably for an internal combustion engine fuel injection pump, comprising a tappet (12) and a roller (14) mounted to rotate on the tappet and intended to press against a cam. The tappet (12) comprises a roller support body (16), a shaft (26) for mounting the roller on the said body, and a guide sleeve (18) attached to the support body and at least partially surrounding the said body. The ends of the shaft are fixed in through-holes in the support body.

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: An electromagnetic actuating device comprising a plurality of electromagnetic actuation units (10, 12, 14), which can be selectively controlled for exerting an actuating force on a corresponding plurality of elongated tappet units (22, 24, 26) that are supported axially parallel, wherein the actuation units are provided in a common housing (18, 20; 78, 82) along the actuating direction axially parallel to each other, and form a contact surface that is at least planar in some sections and can be axially moved in the actuating direction at each associated engagement end facing the tappet units. A face (34, 36, 38) on the engagement side of each of the tappet units interacts with the engagement surface (28, 30, 32), wherein at least one of the plurality of tappet units sits eccentrically and/or with only a partial surface, with the face thereof on the engagement side, on the engagement surface of the associated actuation unit, particularly adheres to it magnetically.

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: The invention proposes a switchable tappet (1) of a valve train of an internal combustion engine, said tappet comprising a hollow cylindrical housing (3) comprising a bottom (2), an inner element (5) being guided for relative axial displacement in a bore (4) of the housing (3), an at least indirect support for a gas exchange valve extending on a cam-distal front end (6) of the inner element (5), two diametrically opposing pistons as coupling elements (8) being arranged in a radial bore (7) of the inner element (5), which coupling elements (8), for effecting coupling [full valve lift], can be displaced partly beyond a parting surface (9) between the housing (3) and the inner element (5) into an entraining surface (12) of the housing (3) by the force of a compression spring (10a) clamped between inner front ends (10) of the coupling elements (8), wherein the entraining surface (12) is an direct constituent of a separate annular member (13) that is fixed in a cam-distal region of the bore (4) of the housing (3),

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 valve lifter for an internal combustion engine includes a skirt portion formed in a tubular shape; and a crown portion formed integrally with an axially one end side of the skirt portion. The crown portion includes a crown surface configured to slide in contact with an outer circumferential surface of a cam. An axis of the crown portion is eccentric from a center of the cam in a width direction of the cam. The crown surface is formed in a spherical protruding shape to have its uppermost portion at a center of the crown surface. A protruding amount of the spherical protruding shape is set to range from 11 ?m to 50 ?m.

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