APPARATUS AND SYSTEM COMPRISING COLLAPSING AND EXTENDING MECHANISMS FOR ACTUATING ENGINE VALVES

摘要

An apparatus and system for actuating at least one engine valve includes a rocker arm having a collapsing mechanism and an extending mechanism. The rocker arm may be configured as an exhaust rocker arm or an intake rocker arm. The collapsing mechanism is disposed at a motion receiving end of the rocker arm and is configured to receive motion from a primary valve actuation motion source. The extending mechanism is disposed in the rocker arm and configured to convey auxiliary valve actuation motions to the at least one engine valve. In a first embodiment, the extending mechanism is disposed at a valve actuation end of the rocker arm, whereas in a second embodiment, the extending mechanism is disposed at the motion receiving end of the rocker arm. Supply of fluid to a first and a second fluid passage controls operation of the extending and collapsing mechanisms, respectively.