Abstract: A valve tappet actuated by a cam of an internal combustion engine comprises a cup (1) having a hollow cylindrical skirt (2) and a cup bottom (3) which closes the skirt (2) at one end. On an outer surface, the skirt (2) comprises a peripheral groove (4), and on an inner surface, at least one bead (5). Concentrically arranged within the cup (1) is an inner element (6) whose casing (9) bears against the bead (5, 21). A hydraulic valve clearance compensation element (10) is guided for axial displacement in the inner element (6). To simplify the manufacturing of this valve tappet, it is proposed that the cup (1) is hardened in a heat treatment process, and the inner element (5) is unhardened.

Abstract: In a tappet (1) of a valve train of an internal combustion engine, the leakage of hydraulic medium occurring between its reception bore (6) and skirt (2) is to be reduced. To achieve this, the tappet (1) of the invention comprises an anti-rotation device (22) and, at the same time, a supply of hydraulic medium from a supply gallery (21) to an annular oil reservoir (17) is effected directly, i.e. annular grooves and other oil deflecting measures are dispensed with. An aperture (19) in the skirt (2) for the supply of hydraulic medium can, at the same time, be advantageously arranged in a bottom-proximate region thereof.

Abstract: A valve tappet actuated by a cam of an internal combustion engine comprises a cup (1) having a hollow cylindrical skirt (2) and a cup bottom (3) which closes the skirt (2) at one end. On an outer surface, the skirt (2) comprises a peripheral groove (4), and on an inner surface, at least one bead (5). Concentrically arranged within the cup (1) is an inner element (6) whose casing (9) bears against the bead (5, 21). A hydraulic valve clearance compensation element (10) is guided for axial displacement in the inner element (6). To simplify the manufacturing of this valve tappet, it is proposed that the cup (1) is hardened in a heat treatment process, and the inner element (5) is unhardened.

Abstract: A tappet for the valve drive of an internal combustion engine, includes a cup-shaped housing (1) and an insert which is arranged inside the housing (1) and has an outer sleeve (4), which bears upon the cylinder wall, and an inner guide tube (5). Displaceably guided in the guide tube (5) is a hydraulic clearance compensation element (7), with the insert forming with the cylinder wall (2) of the housing (1) an oil channel (17) which extends from a bottom-distant inlet opening (18) of the cylinder wall (2) to a port adjacent an oil chamber (13, 15) and neighboring the bottom (3). In accordance with the invention, the oil channel (19) on the insert is designed as a helical groove formed in the outer sleeve (4).

Abstract: A cup-shaped tappet (1) for actuating a gas exchange valve (17) of an internal combustion engine, comprising a cylindrical jacket (6) closed at one end by a bottom (7) and guided in a bore (2) of a cylinder head (3), the valve tappet (1) being actuated by a cam (4) of a camshaft (5) acting on the bottom (7) of the tappet (1) characterized in that the bottom (7) and the jacket (6) are steel components having respective wall thicknesses (A),(B) dimensioned so that a product (P.sub.1) of the wall thicknesses, (A).times.(B) expressed in millimeters is <2.3, the wall thickness (A) of the bottom (7) being 1.7 to 2.4 mm and the wall thickness (B) of the jacket (6) being 0.7 to 1.0 mm.

Abstract: The outer peripheral surface of the housing (2) of a support element (1) for a finger lever of a valve drive of an internal combustion engine comprises a serration toothing (13) which is pressed into a reception bore (4) of a cylinder head (5) during mounting. During pressing-in, material is sheared off the tooth tips and displaced wholly or partly into the gaps between the teeth towards the root of the toothing. In this way, the clearance compensation element (1) is retained secure against rotation in the reception bore (4).

Abstract: The clearance compensation element (5) of a lever (26) is retained axially within a bore (27). An end of the bore (27) comprises a diameter enlargement (29) in which a Belleville-type spring washer (16) with a radially outwards acting retention force is arranged to achieve a positioning of a pressure piston (7) of the clearance compensation element (5).

Abstract: Upper and lower contact discs (5, 6) are used for adjusting valve clearance with a mechanical cup tappet (1). The lower contact discs (6) have a substantially larger clearance adjusting range H.sub.SW than the upper contact discs (5). In this way, the invention succeeds in further reducing the total mass of the cup tappet (1) because, in an initial mounting of the cup tappet (1), the valve clearance is adjusted through the relatively small lower contact disc (6) and thus with relatively small mass fluctuations.

Abstract: A valve drive of an internal combustion engine, includes a switching mechanism incorporated in a support element for support of a cam follower disposed in driving relationship between a camshaft and the gas exchange valve for switching a gas exchange valve to different valve lift curves in response to an operation of a cam arrangement, whereby the switching mechanism has a hollow cylindrical housing defining an axis and received within an enveloping outer casing, an inner element axially displaceable relative to the housing and so received within the housing as to form at their interface an annular gap, and a coupling mechanism movable in a radial direction in a first radial bore arrangement so as to couple the inner element with the housing in a base circle phase of the cam arrangement by bridging the annular gap to thereby maintain a contact of the cam follower upon the cam arrangement, and movable in a radial direction in a second bore arrangement which is spaced from the first radial bore arrangement in d

Abstract: A hydraulic clearance compensation element free of prior art disadvantages and manifesting substantially higher sink values over a wide range of temperatures.

Abstract: A switchable supporting component (30) is to be designed in such a way that a pull-rod engaging at one end (35) of it can be fully operatively separated from the control cam. The invention effects this in that in the housing (31) there runs at least one further radial drilling (37) aligned in a large cam movement phase in which there is a coupling component (49) movable along the drilling which, when the cam is disconnected from the pull-rod, can move in such a way that it laps over an annular gap (41) formed between the housing (31) and the cylinder head (10) and runs at the same time in the two drillings (37) in the housing (31) and the cylinder head (10). Thus, the idle stroke of the housing (31) necessary when the pull-rod is disconnected is avoided. Disconnection can take place even at medium to fast rotation speeds, since a pressure spring (47) no longer keeps the pull-rod in permanent contact with the cam via the housing (31) in the disconnection phase.

Abstract: In a valve drive (1) for the simultaneous actuation of, for instance, three equally acting gas exchange valves (2), longitudinal axes of the gas exchange valves (2) are arranged so as to include an angle therebetween wherein a bridge (4) is arranged between the cams of a camshaft (3) and the gas exchange valves (2), and the longitudinal axis (9) of the guide means (5) of the bridge (4) extends parallel to a bisectrix (10) between the longitudinal axes of the gas exchange valves (2a, 2b).

Abstract: The clearance compensation element (1) of the invention which can be installed, for example, in a valve drive of an internal combustion engine has a certain idle stroke function for undesired overpressure states of its high pressure chamber (12) during a base circle phase of the actuating cam. According to the invention, a valve means (14) such as a ball which closes the high pressure chamber (12) in the direction of a reservoir (10) is freely movable within certain limits. The ball (14), while being extremely light, closes the valve seat bore (13) with the shortest possible stroke immediately upon commencement of the opening ramp (A.sub.N) of the cam.

Abstract: A tappet (1) is to be engageable on to at least three different cam profiles with an optional zero lift. To this end the tappet (1) consists of an annular base section (2) enclosing a circular base section (3). Both base sections (2, 3) can be coupled together via radially adjustable coupling devices (10). An additional, axially movable inner piston (18) is fitted in a guide sleeve (7) of the circular base section (3). The inner piston (18) can be decoupled via further coupling means (23) so that the tappet (1) can be completely decoupled from the guide sleeve (7).

Abstract: A valve actuating mechanism which can be set to three different strokes for a gas exchange valve includes a finger lever actuated by a control cam with a single lift curve, with the finger lever being selectively connectable to a longitudinal guide in the region of its bearing member via incorporation of a piston that is movable in various positions. In a first coupling position of the piston, the bearing member is fixed to the longitudinal guide so that the finger lever executes a maximum pivot during the lift phase of the cam. In a second coupling position of the piston the finger lever is moved axially along the longitudinal guide during a complete cam lift so that the opening cross section of the gas exchange valve is smaller than in the first coupling step. In a third coupling step of the piston, the finger lever executes an idle stroke-pivoting movement on its point of contact on the gas exchange valve which remains closed.

Abstract: A cam follower (1) comprises an annular and a circular bottom portion (2, 3). The two bottom portions (2, 3) are concentric to each other, and a low lift cam (4) is arranged opposite the circular bottom portion (3) while at least one high lift cam (5) is arranged opposite the annular bottom portion (2). The cams (4, 5) are arranged out-of-phase with each other in circumferential direction. Since, therefore, when the cam follower (1) is coupled to the high lift cam (5), the low lift cam (4) would disadvantageously actuate the cam follower (1) with its excess lift, a means is provided in the cam follower for compensating this undesired lift.

Abstract: The clearance compensation element (5) of a hydraulic tappet (1) is retained axially in cam-remote direction by an axial extension (11) of a guide element (10) which extends radially inwards from the housing (2). The cam-remote end of the axial extension (11) comprises a diameter enlargement (14) in which a Belleville-type spring washer (16) with a radially outwards acting retention force is arranged to achieve a positioning of a pressure piston (7) of the clearance compensation element (5).

Abstract: A device (1) for simultaneous actuation of at least two gas exchange valves (2) of an internal combustion engine comprising a bridge-type cam follower (3) arranged in driving relationship between a camshaft and the gas exchange valves (2) and serving to directly transmit a stroke motion caused by a control cam (4) of the camshaft to the gas exchange valves (2), said cam follower (3) being guided by guiding means (18,19) for vertical displacement in a cylinder head and comprising a cam contacting element (31) on which the control cam (4) runs, characterized in that the cam contacting element (31) in the cam follower (3) is displaceable relative to the cam follower (3) so that the cam follower (3) can be uncoupled from a stroke-transmitting motion of the control cam (4).

Abstract: A tappet (1) for a valve drive or an internal combustion engine comprising a hollow cylindrical housing (2) guided for axial displacement by a jacket (3) thereof in a reception bore (4) of a cylinder head (5), an end of the housing (2) facing a cam (8) being closed by a bottom (7), a guide sleeve (11) arranged concentrically in the tappet (1) for guiding a hydraulic clearance compensation element (10) being supported by a connected web (12) against the jacket (3) which is made of two separate, bush-like sections (14,15) of approximately equal diameter separated from each other in the region of a central transverse plane, and a first cup-shaped section (14) of the jacket (3) being connected at a cam-proximate end thereof to the bottom (7), characterized in that the second, lower section (15) comprises an extension (16) starting axially adjacent the first section (14) and extending into an immediate vicinity of the bottom (7), the second section (15) with its extension (16) has a smaller wall thickness than the

Abstract: A finger lever (1) used together with a camshaft (10) for actuating gas exchange valves (6, 7) of an internal combustion engine, which finger lever for simultaneously actuating two gas exchange valves (6, 7) is configured as a forked finger lever (1) and is supported at one end on a support element (2, 2a) and bears at an opposite end against an end of a shaft of a gas exchange valve (6, 7) the support element (2, 2a) comprising a device for compensating valve clearance, characterized in that a clearance compensation element is arranged on at least one of the ends of the forked finger lever (1) facing the ends of shafts of the gas exchange valves (6, 7).