Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Patent
1993-06-02
1995-09-19
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Dashpot or fluid controlled retarder or timer
123 9012, 123 9016, 123 9066, 251263, F16K 3152, F16K 31122, F01L 104
Patent
active
054510295
ABSTRACT:
A variable valve control arrangement for a lift valve of an internal combustion engine has a longitudinally adjustable coupling assembly disposed between a cam and the lift valve including an outer cup plunger and an inner plunger on the lift valve side and a hydraulic working space formed between the plungers. During the flanks of the valve lift curve, communication is established at times between the hydraulic working space and a pressure medium supply through the cup plunger so that at sufficiently high pressure the coupling assembly will increase its length. During the valve closing phase, the pressure in the working space is reduced through a throttle aperture in the cup plunger.
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Volkswagen AG
Walton George L.
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