Fluid-pressure and analogous brake systems – Automatic – Synchronizing
Patent
1993-09-27
1994-07-12
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Automatic
Synchronizing
303 39, B60T 1368
Patent
active
053282531
ABSTRACT:
The electropneumatic control system for the pressure in the main air pipe (37) of compressed air brakes of rail cars is provided with one inlet and one outlet solenoid valve (3 and 4) to control the pressure in a control chamber (26) of a relay valve (19). The inlet solenoid valve (3) and the relay valve (19) are supplied with compressed air from a main reservoir pipe (34). The relay valve controlled by the pressure in the control chamber (26) against the pressure in the main air pipe (37) controls the compressed air lead-in and lead-out for the main air pipe (37). To avoid the undesired response of the relay valve (19) to pressure changes elsewhere in the main air pipe (37), the two sides of the piston (20) of the relay valve (19) are closed without any throttling by way of the secondary valve parts (13 or 14) of the two solenoid valves (3 and 4) in the unactuated state of the control system (2).
REFERENCES:
patent: 4021079 (1977-05-01), Bohusch
patent: 4026609 (1977-05-01), Bridigum
patent: 4576416 (1986-03-01), Muller et al.
patent: 5100208 (1992-03-01), Angermair
Goritz Bernd
Huber Erich
Ballato Josie A.
Knorr-Bremse AG
Oberleitner Robert J.
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