Master cylinder with fluid level and pressure failure detector

Details Master cylinder with fluid level and pressure failure detector Master cylinder with fluid level and pressure failure detector

1989-07-27

1991-05-21

Kwon, John T.

Power plants

Pressure fluid source and motor

Pulsator

340452, 60545, F15B 700

Patent

active

050164422

ABSTRACT:
A master cylinder having a housing with a first bore therein for retaining a pair of pistons which move in response to an input force and develop fluid pressure to effect a brake application. A second bore in the housing carries a differential area piston connected to the pressure chambers. A reed switch retained in the housing is aligned with a first magnet located on a float in a reservoir and a second magnet is attached to the differential area piston. A ferromagnetic shield located between the reed switch and second magnet has first and second openings located in a plane on either side of the reed switch. Should a failure occur in either pressure chamber, the differential area piston moves to allow magnetic field to pass through the openings in the shield and activate the reed switch to develop a warning signal and inform an operator of a failure mode condition in the master cylinder.

REFERENCES:
patent: 3538274 (1970-11-01), Gfeller
patent: 3603925 (1971-09-01), Hughes
patent: 3872885 (1975-03-01), Eloi et al.
patent: 3896280 (1975-07-01), Blake
patent: 3947648 (1976-03-01), Muterel
patent: 3947813 (1976-03-01), Uemura et al.
patent: 4017124 (1977-04-01), Cadeddu
patent: 4082930 (1978-04-01), Peeples
patent: 4090050 (1978-05-01), Siiberg
patent: 4217779 (1980-04-01), Masuda et al.
patent: 4301653 (1981-11-01), Carre et al.
patent: 4472943 (1984-09-01), Grabill
patent: 4604866 (1986-08-01), Gaiser
patent: 4914916 (1990-04-01), Leigh-Monstevens et al.

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