Negative pressure boosting device
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United States of America Patent
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-
Aug 31, 2004
Grant Date -
Jul 3, 2003
app pub date -
Sep 3, 2002
filing date -
Dec 27, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a negative pressure boosting device, a movable valve seat is air-tightly and slidably disposed in a concavity of a valve body. The movable valve seat and a valve element compose a vacuum valve. A servo ratio changing device includes a control spring compressed and disposed between the movable valve seat and the valve body. The servo ratio changing device is provided on a valve mechanism (the vacuum valve). During operation, the valve element comes in contact with the movable valve seat. The movable valve seat does not move in a low-input range so that the servo ratio is a relatively large ratio for the normal operation. In a high-input range, the control spring starts to be compressed to move the movable valve seat, thereby changing the servo ratio to a small ratio.
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