Automatic brake booster
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Jul 7, 1999
filing date -
Aug 7, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A valve mechanism comprises a first valve seat formed on a valve body and facing rearward, a second valve seat formed on a sleeve which is urged rearward of a spring and facing rearward, and a valve element urged by a popped return spring to be seated upon either valve seat. An effective diameter D1 of a rolling part of the valve element, an effective diameter D2 of a seal member and an effective diameter D3 of the second valve seat are chosen to be equal to each other. This arrangement allows a differential pressure which urges the sleeve and the valve element forward in the inoperative condition of the brake booster to be cancelled out, thereby allowing a load to which an urging spring must be charged to be reduced and thus allowing the use of a solenoid which is reduced in size, weight and heating value and hence which is inexpensive.
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Cited Art Landscape
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