Brake accelerator for a fluid-pressure brake system having a bra

Details Brake accelerator for a fluid-pressure brake system having a bra Brake accelerator for a fluid-pressure brake system having a bra

1977-10-20

1979-02-13

Kunin, Stephen G.

Fluid-pressure and analogous brake systems

Releasing

Control pipe

303 37, 303 69, B60T 1704

Patent

active

041392396

ABSTRACT:
A brake accelerator has a control chamber connected through a throttle orifice to a brake line. The brake system includes a control valve in which is an emergency brake piston one side of which is subjected to brake line pressure and the other side of which is subjected to pressure in the control chamber. The emergency brake piston, as a function of a pressure drop in the brake line, opens a brake line outlet valve so that air flows from the brake line through an inlet valve. The inlet valve is held by a control piston in its open position at the start of a pressure drop in the brake line and the air is flowed into a chamber to form a control pressure. The control pressure acts on the control piston to open an outlet valve for tapping or drawing off the air from the chamber and to close the inlet valve in such a manner that after a predetermined period of time when the pressure in the chamber has dropped below a predetermined value the control piston will be returned by a spring to its initial position so that a limited quantity of pressure fluid is drawn from the brake line by the accelerator.

REFERENCES:
patent: 3716276 (1973-02-01), Wilson et al.
patent: 3988044 (1976-10-01), Hill
patent: 4043605 (1977-08-01), Hart

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