Power plants – Pressure fluid source and motor – Pulsator
Patent
1990-11-01
1991-10-15
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60589, 303113, B60T 1128, F15B 708
Patent
active
050563130
ABSTRACT:
A dual brake circuit master cylinder with center compensation on the second circuit is provided. The master cylinder has a second piston mounted within a housing bore sealably separating a second reservoir passage from the second brake circuit passage when the pressure within the bore exposed to the second brake circuit passage exceeds the pressure within the bore exposed to the second reservoir passage. The second piston also has a compensating passage with an inclusive valve seat with an inserted compensating valve allowing fluid communication between the second reservoir and second brake circuit passages when the pressure in the second reservoir is greater than the pressure in the brake circuit. An auxiliary piston is provided to insure that the second compensating valve is retained to an open position when ever the second piston is in a retracted position and excessive pressure in the brake second circuit has acted to close the second compensating valve.
REFERENCES:
patent: 3800538 (1974-04-01), Jones
patent: 4550567 (1985-11-01), Schaefer
patent: 4621498 (1986-11-01), Schaefer
patent: 4707989 (1987-11-01), Nakamura et al.
patent: 4793139 (1988-12-01), Reynolds
patent: 4798422 (1989-01-01), Becker
patent: 4891945 (1990-01-01), Becker
patent: 4932312 (1990-06-01), Sugimoto
patent: 4949542 (1990-08-01), Pruett
Hous Kenneth R.
Shroyer Tomas L.
Venetos Brad N.
General Motors Corporation
Helms Ernest E.
Look Edward K.
Ryznic John
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