Engine sub-system actuators having variable ratio drive mechanisms
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United States of America Patent
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Aug 17, 2010
Grant Date -
May 8, 2008
app pub date -
Jul 9, 2007
filing date -
Jul 10, 2006
priority date (Note) -
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Abstract
An EGR valve (20) comprises three gear parts (40, 42, 44) that provide a variable ratio drive system through which an electric actuator (34) operates a movable valve element (26). Each of the gear parts (40, 42, 44) is a single unitary part, with one part (42) containing two sets of gear teeth (46, 48) each associating with a set of gear teeth of a respective one of the other two parts. Limit stops (56, 58, 60; 68, 70) are integrally formed in two parts (42, 44).
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