Ratio control valve for tractor rear axles

Details Ratio control valve for tractor rear axles Ratio control valve for tractor rear axles

1981-06-15

1984-06-19

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

188349, 303 7, 303 28, B60T 818, B60T 826

Patent

active

044550510

ABSTRACT:
The invention relates to an improvement in a valve for a tractor air brake system for changing the pressure delivered to air brakes on a tractor rear axle during "bob tail" operation and particularly to a valve wherein the ratio is changed by communication of control pressure to a second control surface in accordance with the presence of trailer emergency pressure. The improved ratio control valve enables fluid pressure communication to both control surfaces of the ratio valve until a predetermined input pressure is reached so that the "crack-open" input pressure for both the "trailer-connected" and the "bob tail" modes of operation will be the same. Further in accordance with the invention, a blend-back valve is provided which is biased by the available fluid pressure in the tractor reservoir tank so that the maximum available tractor reservoir pressure may always be applied to the tractor rear axle brakes even when the trailer is operating in the "bob tail" mode.

REFERENCES:
patent: 3183042 (1965-05-01), Bueler
patent: 3190700 (1965-06-01), Fites
patent: 3459000 (1969-08-01), Oberthur
patent: 3603648 (1971-09-01), Reznicek et al.
patent: 3614169 (1971-10-01), Bueler
patent: 3677606 (1972-07-01), Shutt
patent: 3771836 (1973-11-01), Bueler
patent: 3964794 (1976-06-01), Scholz
patent: 4118076 (1978-10-01), Mild
patent: 4261624 (1981-04-01), Plantan
patent: 4348062 (1982-09-01), Koenig

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