Double brake booster
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 9, 1993
Grant Date -
N/A
app pub date -
Jul 8, 1992
filing date -
Jul 30, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a double brake booster for a motor vehicle, provided with a valve enabling the boost ratio to be varied as a function of the load of the vehicle. In addition to two pistons (64, 66) articulated to an arm (72), this valve comprises a pusher (80) driven by a third piston (68), to a first face of which is applied a first force representative of the load of the vehicle and to a second face of which is applied a second force of elastic nature, in opposition to the first, this third piston adopting, under the effect of the first and second forces, an equilibrium position which determines that of a variable bearing point for the lever which constitutes the arm (72). Moreover, the arm, the pusher and the three pistons are mounted in the same body, the arm and the pusher being housed in a single cavity (74) which is defined in this body and subjected to a low pressure, and toward which the second faces of the three pistons are turned.
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