Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2005-03-15
2008-03-11
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090130
Reexamination Certificate
active
07341028
ABSTRACT:
Hydraulic valve actuation systems and methods to provide multiple lifts for engine valves using fixed or hard stops at each lift. The fixed or hard stops provide a very repeatable selection of engine valve lifts dependent on engine operating conditions. For full valve lift, unidirectional hydraulic dashpots are used to decelerate the engine valve, both as it approaches the full lift fixed stop, and as the engine valve approaches the valve seat from the engine valve full lift position. Various embodiments and methods of operation are disclosed.
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Klose Charles Conrad
Peña James A.
Strauss Randall James
Sturman Oded Eddie
Blakely , Sokoloff, Taylor & Zafman LLP
Chang Ching
Sturman Industries, Inc.
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