Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2006-06-13
2006-06-13
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C060S591000, C060S413000, C251S062000, C251S063000
Reexamination Certificate
active
07059283
ABSTRACT:
Methods and systems for retaining hydraulic fluid in a hydraulic valve actuation system adapted to be installed on an internal combustion engine are disclosed. The system may include a hydraulic fluid supply connected by one or more passages to a fluid accumulator and a hydraulic valve actuator. The one or more passages may include a retaining portion elevated above portions of the fluid accumulator and/or the hydraulic valve actuator. The retaining portion may include an air vent and thus prevent back flow of all the fluid in the accumulator and/or hydraulic valve actuator to the fluid supply during periods that the engine is shut off. Retention of hydraulic fluid in the system may be further enhanced during engine shut off by selectively controlling the release of hydraulic fluid from the hydraulic valve actuator during the engine shut off process.
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patent: 5410994 (1995-05-01), Schechter
patent: 6257183 (2001-07-01), Vorih et al.
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Fessler Harald
Olivetti Gian M.
Vanderpoel Richard E.
Denion Thomas
Eshete Zelalem
Kelley Drye & Warren LLP
Yohannan, esq. David R.
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