A valve bridge to operatively interface with a rocker arm and a valve, and systems, assemblies, and methods thereof can comprise: a body, of the valve bridge, having a first side and a second side opposite the first side, a first leg of the valve bridge extending from the first side of the body, a second leg of the valve bridge extending from the first side of the body, and a third leg of the valve bridge extending from the first side of the body. A first pin can extend from an end of the first leg opposite the body, and a second pin can extend from an end of the second leg opposite the body.

A rocker assembly for a type III center pivot valvetrain comprises a rocker arm having a cam end, a center pivot bore, and a valve end which includes a first actuator bore and a second actuator bore. The rocker assembly further comprises a a cylinder deactivation actuator arranged in the first actuator bore. The cylinder deactivation actuator comprises a hydraulically actuated latch assembly configured to selectively switch between a latched configuration and an unlatched configuration and a a mechanical lash-setting sleeve distanced from a travel stop defined within the first actuator bore. The cylinder deactivation actuator further comprises a lash step disposed below the mechanical lash-setting sleeve and extending into the first actuator bore. The hydraulically actuated latch assembly is configured to selectively travel between the travel stop and the lash step when the hydraulically actuated latch assembly is in the latched configuration.

A cam follower is provided. The cam follower includes a polycrystalline diamond element, including an engagement surface. The engagement surface of the polycrystalline diamond element is positioned on the cam follower for sliding engagement with an opposing engagement surface of a cam. The cam includes at least some of a diamond reactive material.

A type II valve train assembly that selectively opens first and second intake valves and first and second exhaust valves is provided. The valve train assembly includes an intake rocker arm assembly and an exhaust rocker arm assembly. The valve train assembly is configurable for operation in any combination of activated and deactivated states of engine braking and cylinder deactivation. The exhaust rocker arm assembly includes a first exhaust rocker arm, a second exhaust rocker arm and an engine brake exhaust rocker arm. A first exhaust HLA is associated with the first exhaust rocker arm. A second exhaust HLA is associated with the second exhaust valve. An exhaust actuation assembly selectively actuates to alter travel of the first and second exhaust HLAs to change a state of cylinder deactivation between activated and deactivated.

An exhaust valve opening apparatus such as for an engine compression braking system includes a rocker shaft for supplying control fluid to an controllable valve and for distributing the control fluid to a primary and second piston arrangement that selectively opens an exhaust valve in response to the control fluid being pressurized.

An engine valve actuation system includes a lifter sleeve having a control fluid slot formed therein and extending from an outer sleeve surface to an inner sleeve surface. A valve lifter is movable in a sleeve bore in the lifter sleeve and limited from rotation about a longitudinal axis. The valve lifter includes a hydraulically actuated activation-deactivation switch, and a control fluid port in continuous fluid communication with the control fluid slot.

An internal combustion engine system, includes a two-stroke piston machine having a cylinder for accommodating a reciprocating piston, and further at least one valve for regulating a flow of fluid medium; the ICE system further comprising a rotatable crankshaft for operating the reciprocating piston. The rotatable crankshaft comprises an integrated cam lobe arranged to operate the at least one valve of the two-stroke piston machine.

A valve actuation system comprises a valve actuation motion source configured to provide a main valve actuation motion and an auxiliary valve actuation motion for actuating at least one engine valve via a valve actuation load path. A lost motion subtracting mechanism is arranged in a pre-rocker arm valve train component and configured, in a first default operating state, to convey at least the main valve actuation motion and configured, in a first activated state, to lose the main valve actuation motion and the auxiliary valve actuation motion. Additionally, a lost motion adding mechanism is arranged in a valve bridge and configured, in a second default operating state, to lose the auxiliary valve actuation motion and configured, in a second activated state, to convey the auxiliary valve actuation motion, wherein the lost motion adding mechanism is in series with the lost motion subtracting mechanism in the valve actuation load path.

An actuation transmission apparatus for actuating a component of a switchable valve train device of an internal combustion engine includes: a shaft rotatable by an actuation source; a contacting element for contacting the component of the switchable valve train device; and a biasing device for biasing the contacting element rotationally with respect to the shaft; wherein, in use, the biasing device becomes biased by the shaft when the actuation source rotates the shaft when the actuation source attempts to actuate the component of the switchable valve train device, via the contacting element, when the component of the switchable valve train device is not able to be actuated, whereby the biasing device is configured to cause the contacting element to actuate the component of the switchable valve train device when the component of the switchable valve train device becomes actuatable again.

A valve mechanism includes a valve, a camshaft, an intermediate swing arm located between a cam and the valve, a lift regulating mechanism and a roller assembly. The cam drives the valve to move by means of the intermediate swing arm. The roller assembly is supported by the cam, an eccentric wheel of the lift regulating mechanism and an intermediate swing arm roller. A peripheral surface of the eccentric wheel includes a lift regulating section having a start point and an end point, a maximum lift point of the lift regulating section is located between the start point and the end point, and the lift regulating section is divided into a first section which is convex and a second section having at least a part thereof concave.