Lost-motion variable valve actuation system with cam phaser

摘要

Devices and related methods are disclosed that generally involve variable actuation of engine valves. In one embodiment, a valve train for a split-cycle internal combustion engine or an air hybrid split-cycle engine is provided that includes a cam phaser, a dwell cam, an adjustable mechanical element for performing a variable valve actuation function, and/or a valve seating control device. The devices and methods disclosed herein also have application in conventional internal combustion engines and can actuate inwardly-opening and/or outwardly-opening valves.

主权项

1. An engine comprising:
a camshaft having a cam formed thereon; a rocker coupled to an engine valve; and a lost-motion system comprising: a bearing element having a variable thickness between opposed first and second bearing surfaces, the bearing element being positioned between the cam and the rocker such that the first bearing surface slidably engages the cam and the second bearing surface slidably engages the rocker; an actuator configured to vary the degree to which the bearing element is inserted between the cam and the rocker to vary the degree to which motion of the cam is imparted to the rocker; and a connecting arm that is rotatably coupled to the actuator and non-rotatably coupled to the bearing element; wherein the actuator is collapsible along a length thereof to allow the bearing element to be pushed away from the cam and the rocker.