| 摘要 |
The invention relates to a hydraulic actuator for actuating a gas exchange valve ( 1 ) of an internal combustion engine, which valve is especially closed by the effect of a spring. The actuator is configured by a feed pump ( 6 ) with intermittent and thus variable delivery. The feed pump ( 6 ) has a high frequency and can be equipped for this purpose with piezoelectric, magnetorestrictive and/or electrochemical actuators as the feed elements. Optionally, the feed pump ( 6 ) can be operated with a stop valve ( 7 ) that is disposed downstream of the gas exchange valve ( 1 ) and that is controlled or regulated depending on the feed pump.
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