Hydraulically controlled actuator for actuating gas exchange...

Details Hydraulically controlled actuator for actuating gas exchange... Hydraulically controlled actuator for actuating gas exchange...

2005-12-27

2005-12-27

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090240, C123S090220, C123S090230, C123S090150, C123S090650

Reexamination Certificate

active

06978748

ABSTRACT:
A hydraulically controlled actuator for actuation of an exhaust-side gas exchange valve of an internal combustion engine, containing a control piston that is displaceable within a cylinder and, with piston sides facing away from one another, delimits pressure chambers, of which the one pressure chamber impinges upon the gas exchange valve in the closing direction and the other pressure chamber impinges upon the gas exchange valve in the opening direction. In the actuator is provided at least one spring element, which can be brought into a preloaded state by the control piston moving in the closing direction of the gas exchange valve, and whose stored potential energy accelerates the gas exchange valve in the opening direction at least at the beginning of an opening phase, is provided. This results in a reduction in the energy expended in the context of valve actuation.

REFERENCES:
patent: 4930464 (1990-06-01), Letsche
patent: 5531192 (1996-07-01), Feucht et al.
patent: 5673658 (1997-10-01), Allmendinger
patent: 5809950 (1998-09-01), Letsche et al.
patent: 6315265 (2001-11-01), Adler et al.
patent: 6701879 (2004-03-01), Diehl et al.
patent: 198 26 047 (1999-12-01), None

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