B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/24
B60T 15/42 (2006.01) B60T 17/18 (2006.01)
Patent
CA 1084087
BRAKE ACCELERATOR FOR A FLUID-PRESSURE BRAKE SYSTEM HAVING A BRAKE CONTROL VALVE Abstract of the Disclosure A brake accelerator for a fluid-pressure brake system particularly for railway vehicles 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 subjected to pressure in the control chamber. A second control chamber is connected by a first passage to the brake line and a normally closed first valve is in the first pas- sage which valve is operable to an open position by the emergency piston in response to a pressure drop in the brake line. The first passage also includes a normally open second valve. A second passage connects the second control chamber to the atmos- phere and a control piston is disposed in the second passage to close the second valve and to define in the second passage a normally closed third valve. Pressure fluid entering the second control chamber from the brake line upon opening of the first valve when a decrease in pressure occurs in the brake line in- creases the pressure in the second control chamber so that the increased pressure acts upon the control piston to open the third valve to enable pressure fluid to be drawn off to the atmosphere from the second control chamber and to close the second valve. A spring moves the control piston to close the third valve and to open the second valve when the pressure in the second control chamber drops below a predetermined value so that a limited quantity of pressure fluid is drawn from the brake line by the accelerator.
289146
Hintner Josef
Stauble Georg
Gowling Lafleur Henderson Llp
Knorr-Bremse G.m.b.h.
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