Vacuum type brake booster device for vehicular use

Details Vacuum type brake booster device for vehicular use Vacuum type brake booster device for vehicular use

1981-11-02

1984-03-06

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

92 98D, 92 99, F15B 910, F16J 302

Patent

active

044347073

ABSTRACT:
A vacuum type brake booster device is provided which comprises a booster shell of substantially elliptical shape in transverse cross section, a booster piston of similar shape as the booster shell and accommodated therein for axial reciprocating movement, and a diaphragm secured about the outer periphery thereof to the booster shell and about the inner periphery to the booster piston to divide the interior of the booster shell into a first working chamber in communication with a vacuum source and a second working chamber adapted to be selectively placed in communication with the first working chamber or the atmosphere by a switching valve. The diaphragm is also shaped substantially elliptically in transverse cross section, and includes a pair of opposite straight peripheral wall sections and a pair of opposite arcuate peripheral wall sections interconnecting the straight wall sections; the arcuate wall sections have a wall thickness greater than that of the straight wall sections.

REFERENCES:
patent: 1508654 (1924-09-01), Hales
patent: 2707966 (1955-05-01), Taplin
patent: 2983256 (1961-05-01), Seeloff
patent: 4238992 (1980-12-01), Tuck, Jr.
patent: 4286501 (1981-09-01), Thomas et al.
patent: 4292887 (1981-10-01), Ohta et al.

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