Vacuum brake booster
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United States of America Patent
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Jun 2, 2015
Grant Date -
Apr 25, 2013
app pub date -
Oct 25, 2012
filing date -
Oct 25, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A vacuum brake booster includes a movable wall forming a vacuum chamber and a variable pressure chamber in a housing and a valve body connected to the movable wall. A valve mechanism having a vacuum valve for establishing or interrupting the communication between both chambers corresponding to the movement of a plunger and having an air valve for establishing or interrupting the communication between the variable pressure chamber and atmosphere are disposed in an axial hole of the valve body. Atmosphere after the air valve passed flows into the variable pressure chamber through an axial passage and a radial passage formed in the valve body. The axial passage is constituted by a cylindrical inner passage formed at the outer circumference of the plunger by an arc-like flow regulating wall and an arc-like inner circumferential wall portion and an outer passage formed at the outer circumference of the inner passage.
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