Thermally isolated actuator with temporary contacting linkage for an exhaust valve
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United States of America Patent
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-
Sep 1, 2009
Grant Date -
Jan 24, 2008
app pub date -
Jul 24, 2006
filing date -
Jul 24, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust valve assembly includes a valve body, a valve supported by a shaft within the valve body, and an actuator that moves the valve relative to the valve body to control exhaust flow. The actuator is thermally isolated from the valve by a linkage mechanism that cooperates with exhaust flow to move the valve between open and closed positions. The actuator temporarily contacts the linkage mechanism to initiate opening and closing movement but then moves out of contact with the linkage mechanism as the exhaust flow exerts a force against the valve to move the valve to a fully open or fully closed position. This temporary contact between the linkage mechanism and the actuator reduces heat transfer from the valve to the actuator.
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