Fluid pressure booster for braking device
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United States of America Patent
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Sep 15, 2015
Grant Date -
Jul 12, 2012
app pub date -
Dec 14, 2011
filing date -
Dec 24, 2010
priority date (Note) -
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Abstract
A fluid pressure booster for a braking device includes a control piston on which an input brake operation acts in an advancing direction, and a reaction force based on fluid pressure of a booster fluid pressure generation chamber acts in a retracting direction. A pressure increasing valve is provided between a valve chamber communicating with a fluid pressure generation source and the booster fluid pressure generation chamber. A pressure reducing valve is provided between a release chamber communicating with a reservoir and the booster fluid pressure generation chamber. At least one contraction portion is formed between an outer periphery of a front portion of the pressing rod and an inner periphery of a front portion of a valve seat member.
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