Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1989-11-09
1991-09-10
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, F15B 910
Patent
active
050463993
ABSTRACT:
A tandem type brake booster is disclosed which comprises a booster body, a partitioning wall partitioning the interior of the body into front and rear chambers, a valve body axially movably disposed in the body, front and rear power pistons provided with respective diaphragms associated therwith and respectively dividing the interior of the front and rear chambers into respective constant and variable pressure chambers, a plunger axially movably disposed in the valve body, and a valve mechanism disposed in the valve body to selectively introduce atmospheric air and negative pressure into the variable pressure chambers. The valve body includes a large diameter portion on which the front and rear power pistons are secured and a small diameter portion, the large diameter portion being provided adjacent to the rear end thereof with a slightly reduced diameter stepped portion, the small diameter portion being provided with a circumferentially extending groove. The booster further comprises a retainer mounted on the valve body and having an engaging portion for engaging with the groove to fix the retainer to the valve body and a retaining portion for fixedly retaining the inner circumference portions of the rear power piston and the diaphragm together and onto the stepped portion and detent means on the valve body and on the retainer for preventing the retainer from rotating relative to the valve body.
REFERENCES:
patent: 3688647 (1972-09-01), Kytta
patent: 3754450 (1973-08-01), Putt et al.
patent: 3897718 (1975-08-01), Gardner et al.
patent: 4257312 (1981-02-01), Ohmi et al.
patent: 4348944 (1982-09-01), Ochiai
patent: 4542680 (1985-09-01), Takeuchi
patent: 4590845 (1986-05-01), Tateoka et al.
patent: 4729287 (1988-03-01), Boehm et al.
Look Edward K.
Lopez F. Daniel
Tikico Ltd.
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