Brake booster
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United States of America Patent
Stats
-
Mar 30, 2004
Grant Date -
Sep 19, 2002
app pub date -
Feb 19, 2002
filing date -
Mar 15, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improvement of a valve plunger 14 used in a brake booster 1. A valve plunger 14 is made up of a rearwardly disposed body 34, and an engaging member 35 mounted on a front portion of the body 34. When a brake pedal is quickly depressed during an emergency brake operation, the engaging member 35 retracts rearward relative to the body 34, whereby the axial size of the entire valve plunger 14 is reduced, thereby increasing the opening of an atmosphere valve during the emergency brake operation as compared with a normal brake operation, allowing an output of an increased magnitude to be rapidly obtained. Thus, the invention allows an output from the brake booster 1 to be rapidly increased in immediate response to a quick depression of a brake pedal.
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