Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2006-02-14
2006-02-14
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090110, C123S090130
Reexamination Certificate
active
06997147
ABSTRACT:
An electrohydraulic unit for actuating the valves of an endothermic engine is provided with a hydraulic actuator for lifting a respective valve by means of a pressurized liquid and a spring antagonistic to the hydraulic actuator in order to close the valve and to discharge the liquid from the hydraulic actuator in the final closure phase of the valve through a discharge branch provided with a calibrated orifice to slow down the expulsion of the liquid and maintain a substantially constant closing velocity of the valve during discharge of the liquid from the hydraulic actuator.
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European Search Report for EP 04 10 2849 (Sep. 21, 2004).
Chang Ching
Denion Thomas
Howrey LLP
Magneti Marelli Powertrain S.p.A.
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