Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2006-10-11
2010-02-23
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C091S17000R
Reexamination Certificate
active
07665431
ABSTRACT:
A drive piston assembly is provided that is operable to selectively open a poppet valve. The drive piston assembly includes a cartridge defining a generally stepped bore. A drive piston is movable within the generally stepped bore and a boost sleeve is coaxially disposed with respect to the drive piston. A main fluid chamber is at least partially defined by the generally stepped bore, drive piston, and boost sleeve. First and second feedback chambers are at least partially defined by the drive piston and each are disposed at opposite ends of the drive piston. At least one of the drive piston and the boost sleeve is sufficiently configured to move within the generally stepped bore in response to fluid pressure within the main fluid chamber to selectively open the poppet valve. A valve actuator assembly and engine are also provided incorporating the disclosed drive piston assembly.
REFERENCES:
patent: 3792715 (1974-02-01), Parrett et al.
patent: 6837196 (2005-01-01), Sun
patent: 6959673 (2005-11-01), Sun
patent: 4443169 (1996-06-01), None
Turner et al. “Design and Control pf a Two-stage Electro-hydraulic Valve Actuation System” SAE Paper 2004-01-1265.
Chang Ching
GM Global Technology Operations Inc.
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