A method for operating an electromagnetic actuator (10) with an actuating pin (9) is proposed which comprises the following steps: —determining a pin actuation actual dead time (t11), during which the magnetic armature (15) is substantially immobile while a magnetic coil (12) is supplied with current, wherein the actual dead time ends with the current break-in at the magnetic coil, as a result of counter induction of the magnetic armature overcoming the magnetic force threshold; —determining, before a subsequent pin actuation, the starting time of the magnetic coil current supply, wherein the starting point of the current is advanced compared with that of the target movement start of the pin out of the actuator housing (13) and the determined actual dead time.

A multiple variable valve lift apparatus may include a camshaft rotating by driving of an engine, a cam portion formed in a cylindrical shape having a hollow that the camshaft is inserted into, rotating together with the camshaft, configured to move along an axial direction of the camshaft, and forming a zero cam and a normal cam, a valve opening/closing device configured to be operated by at least one of the zero cam or the normal cam which are formed at the cam portion, an operating device disposed on an exterior circumference of the camshaft so as to move together with the cam portion, and a solenoid configured to selectively move the operating device along an axial direction of the camshaft, in which a journal, which has a radius being equal to a radius of the zero cam, is formed at the cam portion.

A camshaft for a multiple-cylinder internal combustion engine may include a sliding element comprising at least two cam elements, as well as a splined shaft that extends in an axial direction and on which the sliding element is received. The sliding element may comprise an internal spline system that interacts with an external spline system of the splined shaft such that the sliding element is seated fixedly on the splined shaft so as to rotate with the splined shaft. The sliding element may be received on the splined shaft such that the sliding element can, at least initially, be displaced axially. For axially-fixing the sliding element to the splined shaft, the sliding element may include a positively locking connection that is configured in the axial direction and is produced by way of at least one calked connection between the sliding element and the splined shaft. It should be understood that many camshafts include more than one sliding element.

A camshaft may include a shaft as well as a sliding element that is disposed on the shaft such that the sliding element is axially displaceable along a shaft axis. The shaft may comprise an external tooth for transmitting torque between the shaft and the sliding element. The external tooth may engage a mating tooth geometry formed in a passage of the sliding element. The sliding element on its axial end faces may comprise bearing collars that with the shaft form radial supporting bearings of the sliding element on the shaft. Further, the shaft may comprise cylindrical bearing portions for forming the radial supporting bearings, wherein the bearing portions can be configured with a diameter that is smaller than a diameter circumscribed by tips of the mating tooth geometry that protrude into the passage of the sliding element.

A valve train assembly includes a rocker arm assembly, and axial shifting cam assembly, and a lost motion device. The axial shifting cam assembly is movable between a first axial position and a second axial position on a camshaft, the cam assembly having a first cam having a first lobe, and a second cam having a second lobe. The first and second lobes are configured to each selectively engage the rocker arm assembly to respectively perform a first and a second discrete valve lift event. The lost motion device is operably associated with the rocker arm assembly and configured to perform a third discrete valve lift event, distinct from the first and second valve lift events.

A cam system for operating a first engine valve and a second engine valve includes translatable first and a second sliding lobe packs. The first sliding lobe pack operates the first engine valve with one of a high lift lobe, a low lift lobe, and a zero lift lobe. The second sliding lobe operates the second engine valve with one of a high lift lobe or one of two low lift lobes. A shift barrel has a first groove configured to translate the first and a second sliding lobe packs in a first direction, and a second groove configured to translate the first and a second sliding lobe packs in a second direction, opposite the first. A shift actuator has a first pin, a second pin, and a third pin, each selectively actuatable to engage the first groove or the second groove.

In a valve drive train device for an internal combustion engine of motor vehicle, wherein at least one axially movably mounted cam element including at least one cam set with at least two cam parts and a shifting gate with at least two gate track for converting a rotary movement of the cam element into an axial shifting motion, at least one of the cam parts and the adjacent gate track are disposed in an at least partially axially overlapping relationship for reducing thereby the axial length and the mass of the cam element or permitting the use of a larger, highly durable, actuating mechanism.

An electromagnetic actuating apparatus having an armature unit (14) which can move along an axial direction (10) in response to current applied to a stationary coil unit and designed to interact with an actuating partner, wherein the coil unit has a winding (22) with which a connection contact (26) can make contact. The coil unit is accommodated in a housing (12) which surrounds the coil unit at least in sections. The coil unit has an electrical connection for connecting the connection contact to a plug section (18, 20) on the housing. The connection contact (26), together with a flat end section (30) of the electrical connection, which is oriented parallel to the connection contact and is permanently connected to the connection contact, extends at least in sections parallel to the axial direction (10) or is angled out of a position of extent in this direction after connection, wherein the housing end region is axially opposite a housing outlet for the armature unit (14).

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.

A slide cam system includes a camshaft comprising a carrier shaft with slide cam elements that each comprise a slotted switching member having a switching groove. The slide cam elements are displaceable axially relative to the carrier shaft by an actuator pin. A displacement element is arranged parallel with a longitudinal axis of the carrier shaft, and the displacement element is axially displaceable in a direction of the longitudinal axis. The displacement element has a first coupling pin arranged in a region of the first slide cam element and a second coupling pin arranged in a region of the second slide cam element. The coupling pins cooperate with a slotted switching member of the associated slide cam element such that as a result of the displacement element a movement initiated by the actuator pin of the first slide cam element can be transmitted to the second slide cam element.