Valve mechanism of booster
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United States of America Patent
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Jun 1, 2004
Grant Date -
Apr 24, 2003
app pub date -
Sep 25, 2002
filing date -
Oct 22, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
When a booster is inoperative, a first atmosphere valve and a second atmosphere valve are both closed to block a communication of an orifice passage with a variable pressure chamber. At the commencement of operation of the booster, the first atmosphere valve opens while the second atmosphere valve remains closed to allow the atmosphere to be introduced into the variable pressure chamber through the orifice passage, followed by an opening of the second atmosphere valve to allow the atmosphere to be introduced into the variable pressure chamber through the second atmosphere valve and the first atmosphere valve. This arrangement allows the occurrence of oscillations of or abnormal sounds from a valve mechanism to be prevented during the initial phase of the brake operation.
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