Brake booster
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United States of America Patent
Stats
-
Apr 6, 2004
Grant Date -
Mar 27, 2003
app pub date -
Sep 19, 2002
filing date -
Sep 25, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
During a normal brake operation, a brake reaction from a reaction disc is transmitted to a valve plunger through an outer plunger and an inner plunger. During an emergency brake operation, as a valve plunger is driven forward through a given stroke relative to a valve body, a tubular member retracts relative to the valve body. In a servo balance condition, which is reached subsequently, the valve plunger, retracts by an amount corresponding to the retraction of the tubular member, and the outer plunger abuts against a holder. A brake reaction from the reaction disc is transmitted to the valve plunger only through the inner plunger, allowing a booster ratio to be greater and a jumping quantity to be greater than during a normal brake operation. It is possible to increase an output from a brake booster 1 rapidly in immediate response to a quick depression of a brake pedal.
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