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A hydraulically operating actuating device for a lift valve, in particular in an internal combustion engine, has a piston which is connected to the valve stem. The piston is positioned in a cylinder and separates two stroke spaces which are connectable, in each case via inlet and outlet openings whi

A hydraulically operating actuating device for a lift valve, in particular in an internal combustion engine, has a piston which is connected to the valve stem. The piston is positioned in a cylinder and separates two stroke spaces which are connectable, in each case via inlet and outlet openings which can be occluded by the piston, to a pump for the working fluid or a reservoir. In order to reduce the energy requirement of the actuating device, the two inlet openings, which in a central actuation range of the piston are open, are connected to one another directly by a line, and two springs which act in opposite directions and, in equilibrium, hold the piston in a central position relative to two end positions engage on the piston or valve stem.

대표청구항 ▼

Hydraulically acting actuating device for a lift valve, in particular, in an internal combustion engine, having a piston which is connected to a valve stem, said piston is guided in a cylinder and stressed on both sides by working fluid and divides two stroke spaces which are both connectable, via r

Hydraulically acting actuating device for a lift valve, in particular, in an internal combustion engine, having a piston which is connected to a valve stem, said piston is guided in a cylinder and stressed on both sides by working fluid and divides two stroke spaces which are both connectable, via respective openings in a wall the cylinder which can be occluded by piston covering the openings, to a pressure source for pressurizing the working fluid and to a reservoir, wherein the respective openings, which in a central actuation range of the piston each communicate with an associated one of said stroke spaces, are connected to one another directly by a connecting line and wherein springs, which act in opposite directions and hold the piston in a central position in said central actuation range relative to two end positions when in equilibrium, engage on at least one of the piston and a cylinder end wall.