Device for controlling gas exchange valves

Details Device for controlling gas exchange valves Device for controlling gas exchange valves

2005-05-10

2005-05-10

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C091S052000

Reexamination Certificate

active

06889639

ABSTRACT:
An apparatus for controlling gas exchange valves of an internal combustion engine having hydraulic valve actuators each assigned to one gas exchange valve, with one adjusting piston acting on the gas exchange valve and two hydraulic work chambers defined by the adjusting piston the first work chamber acting on the gas exchange valve in the closing direction being constantly filled with fluid that is under pressure, and the second work chamber acting on the gas exchange valve in the opening direction can be filled with and relieved of fluid that is under pressure in alternation via a first and second electrical control valve. Two valve actuators are each triggered in alternation by the same first and the same second control valve, and the switchover of the control valves is performed during the closing state of the two gas exchange valves actuated by these valve actuators.

REFERENCES:
patent: 4009695 (1977-03-01), Ule
patent: 5231959 (1993-08-01), Smietana

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