A valve operating device, in particular for an internal combustion engine, has a camshaft, a cam unit mounted in an axially moveably manner on the camshaft, and an actuator unit which has an actuator for displacing the cam unit on the camshaft. The actuator is periodically mechanically forcibly decoupled during operation.

A cam having at least two part cams are arranged axially behind one another along a longitudinal axis includes an undercut between the cam parts. The part cams have running faces which lie radially on the outside of the part cams and have different variable running face contours. The undercut has a profile with a variable contour which is dependent in each case on that adjacent running face contour which is at a smaller radial spacing from the longitudinal axis than the other running face contour.

An automobile vehicle overhead camshaft system includes multiple camshafts individually having multiple sliding camshaft barrels. Opposed ends of the camshaft barrels individually have a zero-lift lobe. Multiple intake valves are operated by a first one of the camshafts and multiple exhaust valves are operated by a second one of the camshafts. Multiple actuators operate during a deceleration cylinder cut-off (DCCO) mode to slidably displace the camshaft barrels to position the zero-lift lobe of predetermined ones of the multiple sliding camshaft barrels into contact with at least one of: all of the intake valves; or all of the exhaust valves.

An electromagnetic actuator having at least one electromagnetic actuator unit, the actuator unit comprising a coil and a plunger, which plunger is axially movable relative to the coil via energization of the coil, and the actuator unit being arranged in a housing. In order to achieve a particularly simple design, the plunger is arranged approximately coaxially with the coil according to the invention.

The invention relates to an electromagnetic actuating device (20) having at least two actuator units (1a, 1b) which are arranged adjacently in a housing (10) and which each have electrically energizable static coil means (2a, 2b), armature means (3a, 3b) mounted so as to be movable relative to said coil means, and a plunger (4a, 4b) which interacts with the armature means (3a, 3b) and which is mounted so as to be movable along axial plunger direction (S1, S2) and which has a free end portion (5a, 5b) for engagement into an actuation partner, in particular a guide groove of a camshaft, wherein the plungers (4a, 4b) of the actuator units (1a, 1b) of the actuating device (20) are preferably arranged such that the plunger directions (S1, S2) thereof run parallel to one another, and wherein the device (20) has adjustment means (6) which are integrated in the housing (10) and which serve for varying the arrangement of at least one plunger along a plane (E) perpendicular to the respective plunger direction (S1, S2).

Some embodiments of a present disclosure provide a variable valve lift device. The variable valve lift device includes a main shaft, a sleeve, an oil cylinder and a valve mechanism. The sleeve is provided on the main shaft in a sleeve manner, can be driven by the main shaft to rotate together with the main shaft, and can further linearly move relative to the main shaft along an axis direction of the main shaft. A cam assembly is disposed on the sleeve, and includes at least two cams with different projection heights. The oil cylinder includes a cylinder barrel and a piston disposed in the cylinder barrel, the cylinder barrel is fixed onto the main shaft, the piston is fixedly connected to the sleeve. Some embodiments of the present disclosure provide an automobile having the above variable valve lift device.

The invention relates to a method for operating an internal combustion engine, which has an internal combustion motor, which forms at least two combustion chambers, which are bounded by cylinders formed in a cylinder housing and by pistons guided up and down cyclically in said cylinders and in which thermodynamic cycles can be performed during operation of the internal combustion engine, wherein then a gas exchange in the combustion chambers is controlled by means of at least one intake valve (28) and one exhaust valve in the case of each combustion chamber, which valves are actuated by means of cams, and wherein a first operating state is provided, in which the thermodynamic cycles are performed both in a first combustion chamber and in a second combustion chamber and a second operating state is provided, in which the thermodynamic cycles are performed in the first combustion chamber and the thermodynamic cycles are not performed in the second combustion chamber, is characterized in that, in order to switch from the first operating state to the second operating state, a switch is made from the use of a first intake cam to the use of a second intake cam for the actuation of the intake valve associated with the first combustion chamber. Such a method makes it possible to realize a switchover from full operation to partial operation in manner that is as torque-neutral as possible in that the torque component that ceases because of the deactivation of the cylinder or cylinders provided therefor is compensated by the one or more cylinders that continue to actively operate, at least also in that, in the event of the switchover, the delivery ratio, i.e. the ratio of the mass of fresh gas actually contained in the cylinder after the conclusion of a charge cycle to the theoretical maximum possible mass, is increased for said cylinders and, in particular, is set as high as possible.

A valvetrain for an internal combustion engine has a camshaft that can be rotated in a direction of rotation around an axis of rotation, at least two cam pieces arranged on the camshaft which each have at least two cams for actuating a respective gas exchange valve and which are rotationally fixedly connected to the camshaft, and an actuator via which the cam pieces can be shifted in the axial direction of the camshaft. A first of the cam pieces has a first rib protruding outwardly from a first base body of the first cam piece in the radial direction of the camshaft and the second cam piece has a second rib protruding outwardly from a second base body of the second cam piece in the radial direction of the camshaft.

The disclosure relates to a valve train of an internal combustion engine having variable-lift gas exchange valves, comprising: a carrier shaft, a cam piece arranged on the carrier shaft in a rotationally fixed and axially displaceable manner. The cam piece comprises a cam group of axially adjacent cams of different elevations, and an axial slotted link having axially opposite displacement grooves, each having a displacement region and an outlet region. Actuator pins, by engaging with the displacement grooves, displace the cam piece on the carrier shaft. Each displacement groove axially delimits, partially or completely, the outlet region by only one groove wall, and the one groove wall, at which the actuator pin, which is in engagement with the displacement region, positively accelerates the cam piece into a displacement direction. The width of the displacement grooves is smaller in the outlet region than a diameter of the actuator pins.

A valve drive device has a camshaft which includes a shaft element and a cam piece which can be driven by the shaft element and a first cam effecting a first stroke of a valve and a second cam effecting a second stroke of the valve, and is displaceable in the axial direction of the camshaft relative to the shaft element between a first position, in which the valve can be actuated by the first cam, and a second position in which the valve can be actuated by the second cam, and has an electrically controllable actuator via which the cam piece is displaceable relative to the shaft element in the axial direction as a result of an electrical control of the actuator. The actuator pushes the cam piece alternately back and forth between the positions in the case of successive electrical controls occurring with the same polarity.