Engine valve actuator with valve seating control
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United States of America Patent
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-
Jul 2, 2002
Grant Date -
N/A
app pub date -
Aug 28, 1998
filing date -
Aug 28, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a hydraulic actuator for operating an engine valve, which includes a means for controlling the seating velocity of the valve. The design allows for free, unrestricted movement of the actuator piston during opening of the engine valve, and an unrestricted return of the piston and valve until the valve is within a predetermined distance of the valve seat. Once within this predetermined range, the return velocity of the actuator piston and engine valve are limited by the rate at which a fluid may escape through a restriction. The restriction is calibrated to provide the desired maximum valve seating velocity. The invention also provides for automatic lash adjustment.
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