Vacuum booster device

Details Vacuum booster device Vacuum booster device

1981-03-11

1985-06-11

Hershkovitz, Abraham

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

92 98D, 92169, F15B 910

Patent

active

045221081

ABSTRACT:
A vacuum type brake booster device comprising a first and a second working chambers defined in a booster shell by a booster piston, tie rods extending through the booster piston for connection of the front and rear walls of the booster shell so as to support loads on the booster shell, flexible bellows surrounding each of the tie rods and having opposite ends fixed respectively to the tie rod and the booster piston so that the inside of the bellows is communicated to the second working chamber, and an adjustable stop mechanism provided on an input rod for adjusting a retraction limit of the latter, whereby a control valve is held in a neutral position to keep the second working chamber out of communication with the first working chamber and the external atmosphere so that the bellows becomes expansive owing to a pressure difference between the working chambers for getting out of contact with the tie rod and, accordingly, for keeping the movement of the booster piston undisturbed.

REFERENCES:
patent: 3543298 (1970-11-01), Rockwell
patent: 4227371 (1980-10-01), Takeuchi
patent: 4256016 (1981-03-01), Thomas
patent: 4328738 (1982-05-01), Hamamatsu
patent: 4330996 (1982-05-01), Becht
patent: 4418611 (1983-12-01), Tateoka

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