Hydraulic actuator for actuating a gas exchange valve of an internal combustion engine
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United States of America Patent
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May 3, 2005
Grant Date -
May 20, 2004
app pub date -
Mar 16, 2002
filing date -
Mar 21, 2001
priority date (Note) -
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Abstract
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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