Brake booster
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Jul 14, 1999
filing date -
Aug 28, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A brake booster which permits a booster ratio to be changed in two stages. A first spring 25 is disposed between a first plunger plate 24 and the bottom of a stowage 8A of a valve plunger 8. Toward its front end, the outer periphery of the first plunger plate 24 slidably extends through a second plunger plate 26, which is in turn located at its inoperative position shown by a second spring 28 having a greater spring constant than the first spring 25. When the brake booster 1 is actuated, a reaction disc 33 which bulges rearward initially abuts against the first plunger 24, and subsequently, as the first spring 25 is compressed, it abuts against the end faces of the both plunger plates 24, 28. If a brake pedal is released under this condition, a hysteresis is substantially nullified. The invention provides an improved brake controllability in a region of a greater depression (or input) of the brake pedal.
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