Abstract: A valve drive of an internal combustion engine is provided, having a camshaft (1) which includes a carrier shaft (2) and a cam part (3), which is arranged thereon in a rotationally fixed manner and displaceable between two axial positions and which has at least one cam group of directly adjoining cams (5, 6) having different cam elevations and an axial gate (8) having two cam tracks (9, 10) that extend axially along the circumference in opposing directions, and further having an actuating element (11) that can be coupled to the axial gate for displacing the cam part in the direction of both cam tracks. The cam tracks are arranged one behind the other in the circumferential direction of the axial gate (8).

Abstract: A valve drive (1, 1?) of an internal combustion engine with stroke-variable gas-exchange valve activation is provided. The valve drive includes a camshaft (2, 2?) with a carrier shaft (3) and a cam piece (4, 4?) that is arranged in a rotationally locked way on the carrier shaft and that can move between axial positions and that has a cam group of directly adjacent cams (14a-c, 15a-c) with different lobes and a groove-shaped axial link (16, 16?) and an activation element (18, 19) that can be coupled in the axial link for shifting the cam piece on the carrier shaft. The cam piece is provided with a bearing journal (12, 13, or 12?) on which the camshaft is supported in the radial direction at a camshaft bearing point (9, 10, or 9?) of the internal combustion engine. Here, the axial link is constructed overlapping with the camshaft bearing point on the bearing journal in the axial direction, and the activation element runs in the camshaft bearing point.

Abstract: A valve-train assembly of an internal combustion engine is provided with a camshaft (1) that includes a carrier shaft (2), as well as a cam element (3) that can move on the carrier shaft between two axial positions and that has at least one cam group of directly adjacent cams (5, 6) with different cam lobes and an axial connecting link (8) constructed with a groove with outer guide walls (12, 13, 14, 15) for defining two intersecting connecting link pathways (9, 10), and with an activation pin (11) that can couple in the axial connecting link for moving the cam element in the direction of both connecting link pathways. In this way, the groove base of one connecting link pathway and the groove base of the other connecting link pathway should extend radially offset in height relative to each other, so that the connecting link pathway (9) with the radially lower groove base is also defined by inner guide walls (19, 20) that are formed by the offset in height.

Abstract: A camshaft (1) is provided for a stroke-variable valve drive of an internal combustion engine with a carrier shaft (2) and a cam part (3) that is arranged locked in rotation and movable in the axial direction on the carrier shaft and that is assembled from a cam carrier (4) and a sleeve (5). The cam carrier has a cam group (7, 8) of directly adjacent cams (9, 10, 11, 12) with different cam strokes and an adapter end (6) on which the sleeve is mounted. The sleeve has a setting groove (17) in the form of a groove that extends across an extent of the sleeve and that is used for the specification of an axial setting groove track for an activation pin (18) moving the cam part on the carrier shaft. The setting groove is produced in the sleeve through non-metal-cutting shaping of sheet-metal material.

Abstract: A valve drive of an internal combustion engine, which has a reciprocating poppet valve and a spring element which impinges the closed reciprocating poppet valve with force against the action of a valve seat. The force characteristics are substantially independent of the lift characteristics of the reciprocating poppet valve. The spring element is part of a snap-in locking device, which is stationarily mounted in the engine and surrounds the valve stem of the reciprocating poppet valve. The snap-in locking device has snap-in elements arranged in the power flux between the spring element and reciprocating poppet valve. The snap-in elements are supported in the direction of closure of the reciprocating poppet valve on a snap-in surface of the valve stem when the reciprocating poppet valve is closed and on a snap-in surface of the snap-in locking device when the reciprocating poppet valve is open.

Abstract: An internal-combustion engine with a device for adjusting the rotational angle (camshaft adjuster (1)) of a camshaft (2) relative to a crankshaft is provided. The device comprises a driving wheel (3) connected in a rotationally locked way to the crankshaft, a driven part (6) connected in a rotationally locked way to the camshaft (2), and an adjusting mechanism, with which the phase position between the crankshaft and camshaft (2) can be set and maintained in a certain range of angles. A reduction of the required axial structural space of the camshaft adjuster (1) and the number of individual parts is achieved in that the driven part (6) is fixed to the camshaft (2) with a frictional, positive-fit, or interference-fit connection.

Abstract: A valve drive for an internal combustion engine having at least one camshaft which has a toothed shaft (2) and at least one cam part (3) with a plurality of different cam paths (13, 14) arranged adjacent to one another for the variable actuation of gas exchange valves (8) by displacement of the cam parts (3) by means of actuators (actuator pins 4 and 5) on the toothed shaft (2), the toothed shaft (2) having a shaft profile (9) and the cam parts (3) having a hub profile (10) which is matched to said shaft profile (9), and the number of wedges, notches or teeth (19) of the shaft profile (9) and of the hub profile (10) being such that the different cam positions for four-stroke internal combustion engines of any type such as in-line engines, V-engines or W-engines, and with any numbers of cylinders, can be provided with the same toothed shafts (2) and cam parts (3).

Abstract: A valve train with cam switching used for intermittent control of a four-cycle internal combustion engine. The valve train comprises a splined shaft, one cam block per cylinder, and a housing-mounted actuator pin. On each end of the cam block is a cylindrical end piece and a mirror-symmetric displacing groove. A housing-mounting actuator pin inserts radially into each displacing groove. The cam block reciprocates axially through the cooperation of the actuator pins and the displacing grooves when the engine is running. Low wear of the valve train and a high switching speed are achieved due to the fact that the displacing grooves possess an accelerating flank with an impact ramp that results in a constant, low initial axial speed of the cam block and a feeble impact force of the actuator pins.

Abstract: A valve drive for an internal combustion engine having at least one camshaft which has a toothed shaft (2) and at least one cam part (3) with a plurality of different cam paths (13, 14) arranged adjacent to one another for the variable actuation of gas exchange valves (8) by displacement of the cam parts (3) by means of actuators (actuator pins 4 and 5) on the toothed shaft (2), the toothed shaft (2) having a shaft profile (9) and the cam parts (3) having a hub profile (10) which is matched to said shaft profile (9), and the number of wedges, notches or teeth (19) of the shaft profile (9) and of the hub profile (10) being such that the different cam positions for four-stroke internal combustion engines of any type such as in-line engines, V-engines or W-engines, and with any numbers of cylinders, can be provided with the same toothed shafts (2) and cam parts (3).

Abstract: A valve train comprising cam switching typically for an intermittent control of a four-cycle internal combustion engine comprising following features and components: a splined shaft comprising an axial outer gearing and one cam block per cylinder, said cam block comprising an inner gearing through which the cam block can be axially displaced and connected rotationally fast to the splined shaft; the cam block comprising per gas exchange valve two cams arranged adjacent to each other and having identical base circle diameters and unequal lifts; on each end of the cam block is arranged a cylindrical end piece, and a mirror-symmetric displacing groove is made radially into the periphery of each cylindrical end piece; a housing-mounted actuator pin for radial insertion into each displacing groove, the cam block being able to reciprocate axially through the cooperation of the actuator pins and the displacing grooves when the engine is running engine.

Abstract: An internal-combustion engine with a device for adjusting the rotational angle (camshaft adjuster (1)) of a camshaft (2) relative to a crankshaft is provided. The device comprises a driving wheel (3) connected in a rotationally locked way to the crankshaft, a driven part (6) connected in a rotationally locked way to the camshaft (2), and an adjusting mechanism, with which the phase position between the crankshaft and camshaft (2) can be set and maintained in a certain range of angles. A reduction of the required axial structural space of the camshaft adjuster (1) and the number of individual parts is achieved in that the driven part (6) is fixed to the camshaft (2) with a frictional, positive-fit, or interference-fit connection.

Abstract: An electromagnetic regulating device with a movable actuator (42), especially a piston, having an engagement region (44) on an end thereof, and a coil device (34, 36), which is stationary relative to the actuator and which is designed to exert a force on the actuator. The electromagnetic regulating device is provided with permanent magnet means, through which the actuator (42) is held to the coil device (34, 36) in the inactive state of the coil device (34, 36) and wherein when current is applied to the coil device (34, 36), the actuator (42) is released from the coil device (34, 36), overcoming a retaining force of the permanent magnet means.

Abstract: An electromagnetic regulating device with a movable actuator (42), especially a piston, having an engagement region (44) on an end thereof, and a coil device (34, 36), which is stationary relative to the actuator and which is designed to exert a force on the actuator. The electromagnetic regulating device is provided with permanent magnet means, through which the actuator (42) is held to the coil device (34, 36) in the inactive state of the coil device (34, 36) and wherein when current is applied to the coil device (34, 36), the actuator (42) is released from the coil device (34, 36), overcoming a retaining force of the permanent magnet means.

Abstract: A valve drive comprising a rocker arm (1) is provided with coupling means (13) for switching off a gas exchange valve. The coupling means (13) is hydraulically actuatable against the force of a spring (15) and the hydraulic actuation is effected from an oil supply (20) of a hydraulic clearance compensation element (6) arranged in the rocker arm (1).

Abstract: In a switchable cam follower (1) comprising an inner element (2) and an outer element (3), with said inner element (2) comprising a hydraulic clearance compensation device (10), a coupling of the two elements (2, 3) is effected by radially extending coupling means (4). These coupling means (4) and the clearance compensation device (10) which is integrated in the inner element (2) are loaded by hydraulic pressure from a cylinder head of an internal combustion engine through separate channels (9, 8). According to the invention, the spring means (5) for the coupling means (4) are configured so that from a hydraulic medium pressure from about 0.6 bars on (idling engine speed), the elements (2, 3) are uncoupled. When a switching engine speed, for example, 3,000 rpm, has been reached, the hydraulic pressure in the channel (9) is reduced to about 0.1 bars by a control valve (11). The coupling means (4) are displaced by the spring means (5) into a coupling position.

Abstract: A two-part tappet is designed to be adaptable to different cam contours. Radial bores (11, 12) are provided in the base sections (2, 3) for receiving at least one radially shiftable piston (13) for coupling the sections (2, 3).

Abstract: A tappet (1) for a valve operating mechanism for an internal combustion engine comprising a thin-walled jacket (3) guided in a bore (5) of a cylinder head (6) and provided in the cam direction with a circular ring-shaped bottom (4) which surrounds a circular bottom (16) of a concentrically arranged guide sleeve (7) in whose bore (9) a clearance compensation element (10) is arranged for longitudinal displacement, the jacket (3) comprising the circular ring-shaped bottom (4) and the guide sleeve (7) comprising the circular bottom (16) being engageable by cams of differing pitch and relatively displaceable axially with respect to each other and with respect to the bore (5) of the cylinder head (6), and a first, central cam (14) of smaller pitch and at least one cam (15) of larger pitch selectively engaging the circular bottom (16) and the circular ring-shaped bottom (4) respectively, characterized in that means are arranged in the jacket (3) which prevent an axial rotation of the tappet (1) in the bore (5) of th