Importance

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Abstract

A variable valve actuation mechanism actuates a valve of an internal combustion engine. The mechanism includes an actuator with a housing and a piston each moveable along a longitudinal axis in the engine. A cavity is defined between the piston and the housing. A body of fluid is disposed in the cavity and in the reservoir. A fluid passage has an open position wherein the cavity and reservoir are in fluid communication and a closed position wherein the cavity is sealed. When the passage is closed, the housing and piston move generally together. When the passage is open, fluid may pass from the cavity to the reservoir and movement of the housing relative to the piston changes the volume of the cavity.

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First Claim