Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1975-08-25
1976-06-29
Blix, Trygve M.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
137494, 188349, B60T 826
Patent
active
039662632
ABSTRACT:
A motor vehicle air brake system which includes a blend back proportioning valve which reduces brake sensitivity at low braking pressures and which allows full braking at high braking pressures. The proportioning valve includes a shuttle piston, a blend back sleeve, and a one-piece outlet diaphragm. The outlet diaphragm seals a reference chamber from outlet pressure and permits movement of the shuttle piston and blend back sleeve together as well as movement of the shuttle piston and blend back sleeve relative to one another. The proportioning valve also includes a one-piece inlet diaphragm which seals the reference chamber from inlet pressure and which provides a valving surface to open and close communication between the inlet and the outlet of the valve. In a second and third embodiment of the proportioning valve, springs are added to alter the proportioning characteristics of the valve.
REFERENCES:
patent: 3011833 (1961-12-01), Stelzer
patent: 3228731 (1966-01-01), Valentine
patent: 3453029 (1969-07-01), Swanson
patent: 3769997 (1973-11-01), Hardwick et al.
Blix Trygve M.
Butler Douglas C.
The Weatherhead Company
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