Device for controlling a cross-section of an opening in the...

Details Device for controlling a cross-section of an opening in the... Device for controlling a cross-section of an opening in the...

2005-07-19

2005-07-19

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150

Reexamination Certificate

active

06918361

ABSTRACT:
A device for controlling an opening cross section in the combustion cylinder of an internal combustion engine is provided, the device having a gas exchange valve integrated into the combustion cylinder and having an actuator which drives the valve element to execute a closing stroke and an opening stroke. A valve brake which is active during a residual closing stroke of the valve element is provided for the purpose of reducing the impact velocity of the valve closure member of the valve element on the valve seat in the closing stroke of the valve element. The valve brake has a hydraulic damping element with a fluid displacement volume which flows out through a throttle cross section of a throttle opening, and a control unit for controlling the throttle cross section as a function of the viscosity of the displacement volume.

REFERENCES:
patent: 4889085 (1989-12-01), Yagi et al.
patent: 198 26 047 (1999-12-01), None

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