Proportioning control valve for use with antilock device

Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors

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Details

188349, 303 963, 303 971, 303113, B60T 1300

Patent

active

048611140

ABSTRACT:
A proportioning control valve for an antilock control device having a cylinder and first and second pistons mounted therein. The first piston has braking output pressure and first input pressure receiving portions. The second piston slidably mounted on a small-diameter portion of the first piston has a second input pressure receiving portion. A spring is interposed between the two pistons to bias them away from each other. A stopper is provided between the two pistons to limit the movement of the second piston toward the first piston. The cylinder is formed with a control input pressure port communicating with the input pressure receiving portion and an output pressure port communicating with the output pressure receiving portion, and a brake pressure input port. With this arrangement, the output pressure which acts on the output pressure receiving portion of the first piston will counteract the input pressure while the input pressure is below the cutting point and will counteract the sum of the input pressure which acts on the first input pressure receiving portion and the bias of the spring after the input pressure has reached the cutting point. Thus the ratio between the input and output pressures is adjustable by varying the total area of the input pressure receiving portions before reaching the cutting point, and by varying the area of the first input pressure receiving portion and bias of the spring after the cutting point has been reached.

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patent: 4316639 (1982-02-01), Schafer
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patent: 4452494 (1984-06-01), Kadota

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