Hydraulic valve actuation system

Details Hydraulic valve actuation system Hydraulic valve actuation system

2005-05-31

2005-05-31

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090140, C123S090150

Reexamination Certificate

active

06899068

ABSTRACT:
An engine valve actuation system may include an actuation assembly having a body, a slidable piston, and first, second, and third chambers defined between the piston and the body. Low pressure and high pressure fluid sources may be included. A first fluid passage may connect the low pressure fluid source to the second chamber. A second fluid passage may connect the high pressure fluid source to the second chamber, and a third fluid passage may connect the high pressure fluid source to the third chamber. A control valve may be connected to the low pressure fluid source, to the high pressure fluid source, and to the first chamber. The control valve may be configured to move between a first position at which the high pressure fluid source is connected to the first chamber, and a second position at which the low pressure fluid source is connected to the first chamber.

REFERENCES:
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patent: 5255641 (1993-10-01), Schechter
patent: 5497736 (1996-03-01), Miller et al.
patent: 5682846 (1997-11-01), Scharnweber
patent: 6263842 (2001-07-01), De Ojeda et al.
patent: 6536388 (2003-03-01), Lou
patent: 0520633 (1992-12-01), None
patent: 0736671 (1996-10-01), None

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