A support arrangement for an actuator of a cam phaser, the support arrangement including an actuator module including an actuator; and a support element configured to support the actuator module on a camshaft, wherein the actuator module is connected to the support element by an electrical contact arrangement configured to actuate the actuator, and wherein the electrical contact arrangement includes an elastic clamping element.

A valve bridge system comprises a valve bridge configured to extend between at least two engine valves of an internal combustion engine. In one embodiment, a valve bridge guide is operatively connected to the valve bridge and configured to extend between at least two valve springs respectively corresponding to the at least two engine valves, the valve bridge guide defining a surface conforming to a valve spring of the at least two valve springs. In another embodiment, the valve bridge guide may comprise at least a first member maintained in a first fixed position relative to and at a predetermined distance from the valve bridge. In both embodiments, the valve bridge guide is configured to avoid contact with the valve bridge in a controlled state, but to permit contact with valve bridge to resist uncontrolled movement of the valve bridge.

A two-stroke internal combustion engine has an engine block having a cylinder block and a cylinder head. The cylinder block defines a cylinder, an exhaust passage, and an exhaust valve passage. The engine also has a piston, an exhaust valve actuator operatively connected to at least one of the cylinder block and the cylinder head, and a reciprocating exhaust valve disposed at least in part in the exhaust valve passage. The exhaust valve has a shaft operatively connected to a valve actuator, and a blade connected to the shaft. A channel is defined along a face of the blade. The channel and a wall of the exhaust valve passage together define at least in part a valve passage. The valve passage permits flow of exhaust gas along the face of the blade. A width of the valve passage is at least a third of a width of the blade.

A support arrangement for an actuator of a cam phaser, the support arrangement including an actuator module including an actuator; and a support element configured to support the actuator module on a camshaft, wherein the actuator module is connected to the support element by an electrical contact arrangement configured to actuate the actuator, and wherein the electrical contact arrangement includes an elastic clamping element.

A continuously variable valve duration apparatus may include a camshaft, a cam unit including a cam, and the camshaft inserted into the cam, a guide shaft on which a guide screw thread is formed and disposed perpendicular to the camshaft, a guide bracket on which the guide shaft is mounted, an inner wheel configured to transmit rotation of the camshaft to the cam unit, a wheel housing into which the inner wheel is rotatably inserted and movable perpendicular to the camshaft, and the wheel housing disposed within the guide bracket, a worm wheel to which an inner screw thread configured to engage with the guide screw thread is formed therewithin, and to which an outer screw thread is formed thereon, and the worm wheel disposed within the wheel housing, a control shaft on which a control worm configured to engage with the outer screw thread is formed.

An internal combustion engine includes a cam-actuated rocker arm assembly with a solenoid-actuated latch that provides for cylinder deactivation or variable valve actuation. The solenoid has an inductance that varies significantly in relation to the position of a latch pin as it translates between latching and non-latching configurations. A sensor is positioned to monitor a current or a voltage in a circuit that includes the solenoid. Diagnostic information relating to the operation of the rocker arm assembly is determined by comparing data collected from the sensor over a first period to data collected from the sensor over a second period.

A valve spring for an engine valve of an internal combustion engine includes a body having a first end and an opposite second end and defining a plurality of coils having an outer surface, and a flocking material applied to at least a portion of the outer surface, the flocking material including a plurality of fibers configured to provide a passive vibro-acoustic damping to facilitate dynamic damping of the valve spring and reduce noise, vibration, and harshness.

A synchronous drive is provided in which a non-circular rotor generates a fluctuating corrective torque to counteract a fluctuating load torque on a driven rotor. The angular orientation of the non-circular rotor can vary relative to the driven rotor so as to change the phase angle of the fluctuating corrective torque relative to the driving rotor. The arrangement may be applied in internal combustion engines with variable valve timing (VVT) systems, wherein the phase angle of a fluctuating load torque presented on a cam rotor, due to forces arising from actuation of intake and/or exhaust valves by the camshaft, varies relative to the crankshaft. The phase angle of the fluctuating corrective torque is also varied relative to the crankshaft to maintain phase relationship with the fluctuating load torque and thereby maintain reduced cam torsional vibrations and span tensions provided by the non-circular rotor during operation.

An internal combustion engine includes a crankshaft having a first end and a second end opposite the first end. The crankshaft defines a crank axis and is rotatable about the crank axis. The internal combustion engine also includes a camshaft that defines a camshaft axis and is rotatable about the camshaft axis. The internal combustion engine further includes a cam drive assembly that is operable to transfer rotation from the crankshaft to the camshaft, a balance mass rotatable about the crankshaft, and a balancer drive assembly operable to drive the balance mass through the cam drive assembly.

The present disclosure relates to a force transmission device for connection between a camshaft 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.