Automatic brake booster
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 21, 2003
Grant Date -
May 30, 2002
app pub date -
Nov 15, 2001
filing date -
Nov 29, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An automatic brake booster 1 includes a solenoid 8 which causes a back- and forth movement of a solenoid plunger 31 to switch a valve mechanism 6. A second vacuum valve seat member 11 including a second vacuum valve seat 12 which is juxtaposed with a first vacuum valve seat 10 on a valve body 3 and a pressure responsive area 34 subject to a pressure of a variable pressure chamber and a pressure of a constant pressure chamber is slidably mounted on the valve body. The effect of the pressure differential acting upon the pressure responsive area is balanced with the force resulting from the excitation of the solenoid plunger 31 to deliver a brake output which corresponds to the force. The invention enables a high accuracy control of a brake output during an automatic brake operation.
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