초록 ▼

An internal combustion engine valve actuation system is disclosed. The present invention provides a hydraulic actuator for operating an engine valve, which includes a control element for controlling the seating velocity of the valve. The present invention provides for free, unrestricted movement of

An internal combustion engine valve actuation system is disclosed. The present invention provides a hydraulic actuator for operating an engine valve, which includes a control element for controlling the seating velocity of the valve. The present invention provides for free, unrestricted movement of the valve during opening, and an unrestricted return of the valve until the valve is within a predetermined distance of the valve seat. Once within this predetermined range, the return velocity of the engine valve is limited by the rate at which a fluid may escape through a flow restriction. The restriction is calibrated to provide the desired maximum valve seating velocity.

대표청구항 ▼

[What is claimed is:] [1.]a guide housing having a bore, a bore side wall, and side wall opening;an outer piston slidably disposed in and engaged by the guide housing bore, said outer piston having an internal hydraulic passage, an internal chamber defined by an outer piston side wall, and an intern

[What is claimed is:] [1.]a guide housing having a bore, a bore side wall, and side wall opening;an outer piston slidably disposed in and engaged by the guide housing bore, said outer piston having an internal hydraulic passage, an internal chamber defined by an outer piston side wall, and an internal opening connecting the internal hydraulic passage and the internal chamber;an inner piston slidably disposed in the outer piston internal chamber and engaged by the outer piston side wall, said inner piston being adapted to collapse into the outer piston;means for selectively throttling hydraulic fluid flow through the outer piston internal opening as the inner piston collapses into the outer piston; andmeans for biasing the throttling means into a position adapted to provide maximum throttling of the outer piston internal opening.