A camshaft adjuster, comprising a drive element and an output element, wherein the drive element can be rotated in relation to the output element within an angular range between an early and a late position. The camshaft adjuster also includes a spring configured to brace the drive element with the output element, wherein the spring is configured to rotate the drive element in relation to the output element into a desired position within the angular range and is further configured to angularly adjust from both an early position and a late position into a direction of the desired position.

The present disclosure relates to a force transmission device for connection between a cam-shaft and a gas exchange valve including a main body with a receptacle which extends along a longitudinal axis. The force transmission device has an actuating piston which is provided in the receptacle such that it can move between a first position and a second position, and a contact body for actuating the gas exchange valve and in operative connection with the actuating piston. The force transmission device has a first blocking piston which is provided in the receptacle such that it can move in a radial direction with respect to the longitudinal axis between a third position, in which the first blocking piston blocks the actuating piston in the first position, and a fourth position, in which the first blocking piston releases a movement of the actuating piston between the first position and the second position.

A system for variable actuation of an engine valve of an internal-combustion engine includes a master piston and a slave piston, driven by the master piston. A control valve controls a communication of a volume of a pressurized fluid with a lower pressure environment, which is connected to a fluid accumulator, and an electronic control unit controls the electrically operated control valve. A device for dampening pressure oscillations is connected to the volume of pressurized fluid and includes an additional volume adapted for receiving fluid from the volume of pressurized fluid only when, following upon oscillations of the pressure in the volume of pressurized fluid, the pressure exceeds a maximum threshold value, which is higher than a mean pressure value that is set up in the volume of pressurized fluid when the master piston drives the slave piston in normal operating conditions.

A valve opening and closing timing control apparatus includes: a driving side rotor synchronously rotating with a crankshaft of an engine; a driven side rotor disposed coaxially with the driving side rotor and synchronously rotating with a camshaft in the internal combustion engine; a fluid pressure chamber formed on at least one of the driving side and driven side rotors, and partitioned into advance angle and retard angle chambers; a bolt disposed coaxially with a rotary axis of the driven side rotor, connecting the driven side rotor and the camshaft, and including a cylindrical portion coaxial with the rotary axis; and a partition body including a press-fit portion press-fitted into the cylindrical portion, and partitioning the cylindrical portion into first and second flow passages for use for feeding and discharging working fluid to and from the fluid pressure chamber, wherein the press-fit portion is provided with a cutting portion.

A cam carrier includes a pair of longitudinal frames provided parallel to an axial direction of a camshaft and a plurality of transversal frames connected to the pair of longitudinal frames to be spaced from each other and supporting the camshaft via cam bearings. A flexible structure suppressing amounts of change in a relative position and an inclined angle of the cam bearings relative to the camshaft due to a thermal expansion is provided on at least one of wall surfaces of the longitudinal frames, the wall surfaces being located between adjacent transversal frames.

A valve train lever for actuating a valve of a reciprocating piston engine, in particular an internal combustion engine. The valve train lever comprises a lever arm, which is pivotally movable about a pin; a tapping element, which lies against or can be made to lie against a cam of a camshaft of the reciprocating piston engine; a coupling mechanism, by way of which the tapping element is coupled to the lever arm spring-elastically in a first state and rigidly in a second state; and an actuating element, which is connected to the lever arm and lies against or can be made to lie against a valve tappet of the valve.

Systems and methods for controlling operation of deactivated engine cylinders are presented. In one example, intake valve timing of deactivated engine cylinders is advanced to reduce amplitudes of intake pressure pulsations while exhaust valves of the deactivated engine cylinders are held closed. Further, intake valve timing of deactivated cylinders may be advanced responsive to output of an intake manifold pressure sensor.

An actuator comprises a hollow first piston (11) comprising a first extant with a first outer diameter (D1) and a second extant comprising a second outer diameter (D2), where D1>D2. A second piston (12) is slidable within the first piston. An actuator housing (14) comprising a recess (22), a first tubular port (23) in communication with the first piston, and a second tubular port (24) in communication with the second piston. The first extant has a length (L1) and wherein the second extant has a length (L2). The first tubular port extends for a length (L4), and the recess extends for a length (L3), where L4L2, and where L3>L2>L1. The first piston and the second piston are housed in the recess.

A valve operating system for a multicylinder engine opens and closes a pair of valves provided on each of cylinders by means of a pair of rocker arms operated by a cam provided on a camshaft supported on a cam holder. When viewed in a direction of a cylinder axis, the pair of rocker aims of at least one of the cylinders are inclined in opposite directions to each other with respect to a direction orthogonal to a camshaft axis. Therefore, thrust loads acting on the camshaft from the pair of rocker al is are counteracted individually for each of the cylinders, thereby enabling the thrust load to be reduced and axial movement of the camshaft to be prevented.

A camshaft phaser including a locking clearance setting pin is provided. The camshaft phaser includes a stator including a first plurality of pin holes extending axially in at least one of the radially inwardly extending lobes arranged along an arcuate path. A locking cover engages against a first axial end face of the stator and includes a locking pin bore and a second plurality of pin holes arranged along the arcuate path and angularly spaced apart from one another by a different angular spacing than the first plurality of pin holes. A pin extends through a respective one of the first plurality of pin holes and a corresponding one of the second plurality of pin holes, such that a location of the pin sets an angular adjustment of the locking pin bore relative to the stator.