초록 ▼

A system for controlling the seating of an engine valve is disclosed. The system is designed to bring a hydraulically actuated engine valve to a soft landing on its valve seat. The velocity of the engine valve is reduced as it approaches its seat by progressively throttling the escape of hydraulic f

A system for controlling the seating of an engine valve is disclosed. The system is designed to bring a hydraulically actuated engine valve to a soft landing on its valve seat. The velocity of the engine valve is reduced as it approaches its seat by progressively throttling the escape of hydraulic fluid from a chamber. The chamber is pressurized as a result of the valve approaching its seat. Accordingly, as the valve approaches its seat, the pressure in the chamber increases, causing the force that opposes the closing motion of the engine valve to increase.

대표청구항 ▼

1. An engine valve seating system having a piston adapted to be bi-directionally displaced in response to the filling and draining of hydraulic fluid from an hydraulic chamber in communication with said piston, said system comprising:means for guiding hydraulic fluid from said chamber during drainin

1. An engine valve seating system having a piston adapted to be bi-directionally displaced in response to the filling and draining of hydraulic fluid from an hydraulic chamber in communication with said piston, said system comprising:means for guiding hydraulic fluid from said chamber during draining; and means for throttling hydraulic fluid flow through the guiding means at a preselected rate in response to a change in position of the guiding means relative to the throttling means during draining, wherein the throttling means includes a central bore, and the guiding means includes a surface adapted to selectively occlude the central bore.