Ball-lift compression ratio adjustment device for a variable compression ratio engine
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United States of America Patent
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Oct 23, 2012
Grant Date -
Nov 18, 2010
app pub date -
Jun 26, 2009
filing date -
Jun 26, 2008
priority date (Note) -
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Abstract
A device for adjusting the compression ratio of a variable compression ratio engine including a hydraulic double-acting control actuator (8) including an upper chamber (121) and a lower chamber (122) and at least one actuator piston (13) connected to a control rack (7) includes: at least two balls (401, 402) or valve elements each resting on a seat (403, 404) and closing off respectively one and the other end of a transfer channel (405) connecting the upper chamber and the lower chamber of the control actuator; and lifting elements (410) making it possible to raise the balls from their seat so that the balls allow the hydraulic fluid to pass in both directions.
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