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AssigneeAVL List GmbH
InventorsThomas Kammerdiener, Peter Herzog, Peter Christian Meurer
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The invention relates to a variable valve train (1) for a cam-actuated lifting valve (13) of an internal combustion engine, which valve (13) is loaded by a closing spring (13a) acting against the direction of opening, with an approximately cylindrical force application element (2) located between a cam (14) and the valve (13), whose length can be adjusted hydraulically and whose exterior cylindrical wall face (3) is slidable in a fixed guide cylinder (4), said element (2) being provided with a pressure piston (6) longitudinally slidable in a cylinder (5), which piston (6) is adjacent to a pressure chamber (7) into which opens a pressure channel (8) departing from a port (9) in the wall face (3) of the force application element (2), a fixed pressure line (11) opening into the guide cylinder (4) in the area of the port (9), which line (11) can be subjected to hydraulic high pressure (pH) permitting hydraulic activation of the valve (13). In order to obtain a variable valve train (1) independet of crank angle (KW) in as simple a manner as possible, a permanent flow connection is provided between pressure line (11) and pressure channel (8) independently of the position of the force application element (2).
A variable valve train for a cam-actuated lifting valve of an internal combustion engine, which valve is loaded by a closing spring acting against the direction of opening, with an approximately cylindrical force application element located between a cam and the valve, whose length can be adjusted hydraulically and whose exterior cylindrical wall face is slidable in a fixed guide cylinder, said element being provided with a pressure piston longitudinally slidable in a cylinder, which piston is adjacent to a pressure chamber into which opens a pressure channel departing from a port in the wall face of the force application element, a fixed pressure line opening into the guide cylinder in the area of the port, which line can be subjected to hydraulic high pressure permitting hydraulic activation of the valve, wherein a permanent flow connection is provided between pressure line and pressure channel independently of the position of the force application element.
Dependencies are inferred from the claim text.