Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2008-12-01
2011-10-18
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090130, C123S090160
Reexamination Certificate
active
08037854
ABSTRACT:
A hydraulic pressure control apparatus of a variable valve system may include a variable valve device for controlling lift characteristics of a valve, a hydraulic pressure control pipe in which an slot is formed from the interior toward the exterior and hydraulic pressure is supplied to the inside thereof, and a driving unit for rotating the hydraulic pressure control pipe, wherein the hydraulic pressure is selectively transferred to the variable valve through the slot according to a rotation of the hydraulic pressure control pipe.
REFERENCES:
patent: 7178489 (2007-02-01), Tanaka
Chang Ching
Hyundai Motor Company
Morgan & Lewis & Bockius, LLP
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