Fluid-pressure and analogous brake systems – Load control – Responsive to fluid pressure spring
Patent
1977-10-18
1978-10-31
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Load control
Responsive to fluid pressure spring
188195, B60T 818
Patent
active
041231155
ABSTRACT:
In a method and apparatus for railway car brake control, a brake control apparatus for cars having sprung and unsprung portions is interposed between a brake valve in a brake pressure supply line and a brake cylinder line. A first chamber is connected to the brake pressure supply line and a second chamber is connected to the brake cylinder line. The chambers are abutted by surfaces having different cross-sectional areas of a diaphragm which is biased. A first valve is responsive to positioning of the diaphragm, which is fluidly biased by a strut cylinder mounted between 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. The strut cylinder can be adapted to sense partially loaded as well as fully loaded or empty car conditions. If desired, the strut cylinder can be made nonresponsive to continuous movement between the sprung and unsprung portions of the car to reduce wear of the strut cylinder during train operation, or be selectively connected only during times of brake application.
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