Hydraulically controlled actuator for activating a valve

Details Hydraulically controlled actuator for activating a valve Hydraulically controlled actuator for activating a valve

2005-02-22

2005-02-22

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090130, C123S090480, C123S090490

Reexamination Certificate

active

06857403

ABSTRACT:
An hydraulically controlled actuator for activating a valve, especially for activating a gas-exchange valve in a combustion cylinder of an internal combustion engine, which includes two fluid-filled pressure chambers having controllable chamber volumes and a movable operating piston which delimits the pressure chambers by piston sides facing away from one another, the operating piston acting upon the valve and having an effective closing area acted upon by fluid pressure in the pressure chambers to close the valve and an effective opening area acted upon by the fluid pressure to open the valve. To influence the kinematics of the opening and closing movement of the valve, the operating piston is such that the surface area of at least one of the two effective areas changes along the sliding path of the operating piston.

REFERENCES:
patent: 3209737 (1965-10-01), Takeo et al.
patent: 5022358 (1991-06-01), Richeson
patent: 20010002379 (2001-05-01), Schechter
patent: 038 41 997 (1989-06-01), None
patent: 198 26 047 (1999-12-01), None
patent: 0 391 507 (1990-10-01), None
patent: 353 575 (1973-02-01), None

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