Fluid-pressure and analogous brake systems – Load control – Responsive to fluid pressure spring
Patent
1978-02-15
1979-10-02
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Load control
Responsive to fluid pressure spring
188195, B60T 818
Patent
active
041696344
ABSTRACT:
In a system and apparatus for railway car brake control, a brake control apparatus for cars having sprung and unsprung portions is interposed between a train brake valve in a brake pressure supply line and a brake cylinder line of each railway car. A supply chamber is connected to the brake pressure supply line and a control chamber is connected to the brake cylinder line. The chambers are abutted by surfaces of a spring biased diaphragm having different cross-sectional areas. A first valve is responsive to positioning of the diaphragm, which is also selectively fluid biased by a strut cylinder mounted between the sprung and unsprung portions of the railway car, to effect predetermined relationships between pressure drop in the brake pressure supply line and pressure drop in the brake cylinder line. When the particular car is loaded, the brake cylinder line experiences a pressure drop substantially equal to that effected in the brake pressure supply line by the train brake valve. When the particular car is empty, the brake cylinder line experiences a pressure drop smaller than the pressure drop in the brake pressure supply line by the inverse ratio of the diaphragm surface areas abutting the control and supply chambers, respectively. The strut cylinder senses the extent of car loading so that the brake cylinder line of a partially loaded car experiences a proportional pressure drop over the entire range of brake pressure supply line pressure drops.
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