Importance

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Abstract

An actuator is provided for operating a valve in an engine. The actuator includes a casing forming an actuation chamber for holding a working fluid and having a first cylinder portion with a first opening and a second cylinder portion with a second opening. A first plunger is held slidably at least partially within the first cylinder portion and exposed through the first opening, and a second plunger is held slidably at least partially within the second cylinder portion and exposed through the second opening. The first plunger is reciprocally movable by action of a rotating cam to displace working fluid within the actuation chamber. The second plunger reciprocally movable by pressure exerted on the second plunger by the working fluid and arranged to exert force on a valve. The casing can also include a valve opening control comprising a third opening in the casing and a control piston slidably fit within the third opening to adjust the movement of the second plunger in reaction to movement of the first plunger, or for opening exhaust valves for engine braking.

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First Claim