Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1999-02-12
2000-06-27
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13711521, 13711525, B60T 1702
Patent
active
060794364
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a energy supply device for a compressed air brake system.
An energy supply device of this kind has already been disclosed (EP 0 689 117 A2), in which the outlet valve (idle valve) has a spring-loaded valve disk, which can be moved into the outlet position by means of a tappet of a piston-like actuation means if the consumer-end pressure level exceeds the previously selected disconnect pressure of the electromagnetically controllable pressure regulating valve and conducts control air to the actuation means of the outlet valve so that this opens abruptly. The closing spring of the outlet valve is dimensioned in such a way that the outlet valve opens independently of the actuation means, even in the event of a failure of the pressure regulating valve, i.e. also functions as a safety valve. However, the (uncontrolled) reaction pressure of the outlet valve is exaggerated relatively markedly in comparison to the disconnect pressure (controlled by the pressure regulating valve). In addition, it is uneconomical if the compressor functions in opposition to the closing spring of the outlet valve in the event of a failure of the pressure regulating valve.
ADVANTAGES OF THE INVENTION
The energy supply device according to the invention, has the advantage over the prior art that in the event of a failure of the electromagnetically controllable pressure regulating valve, the regulation of the pressure is maintained with high quality and in the outlet position of the outlet valve, the compressor can operate at an idle without significant resistance.
A trouble-free guidance of the control air from the respectively operating pressure regulating valve to the outlet valve and vice versa is achieved by means of the measure taken hereinafter.
BRIEF DESCRIPTION OF THE DRAWING
An exemplary embodiment of the invention is explained in more detail in the description below in conjunction with a simplified wiring diagram of an energy supply device for compressed air brake systems.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
An energy supply device 1 represented in the sole FIGURE is provided for use in a compressed air brake system for commercial vehicles that is otherwise not shown. The device 1 has a compressor 2, from which a supply line 3 leads to a compressed air container 4, to which, for example, a service brake circuit, not shown, of the compressed air brake system is attached as a consumer. A check valve 5 that prevents compressed air from flowing back out of the container 4 is disposed in the supply line 3. Between the compressor 2 and the check valve 5, a line branch 6 is connected to the supply line 3 and leads to an outlet valve (idle valve) 7. The outlet valve 7 is embodied as a 2/2-way valve which assumes its closed position in a spring-actuated fashion. It can be switched abruptly into the outlet position with a pneumatic actuation means 8. Furthermore, the outlet valve 7 can be moved into the outlet position by the pressure of the compressor 2. After the outlet valve 7, the line branch 6 continues on to a noise damper 9.
For the sake of a simple depiction, only the compressed air container 4 of one compressed air consumer is represented in the wiring diagram. The supply line 3, however, can be branched after the check valve 5 to other consumers of the compressed air brake system. The additional consumers can either be connected directly to the branched supply line 3 or can be connected to it with a compressed air container. With a compressed air brake system embodied in this manner, a multiple protection valve is disposed in the supply line 3 after the check valve 5 or an overflow valve is disposed in each of the line branches of the supply line. In addition, in modern compressed air brake systems, an air dryer is disposed in the supply line 3 between the connection of the line branch 6 and the check valve 5. The check valve 5 is then bypassed with switching means for the regeneration of this air dryer.
The energy supply device 1 also has two pressure regulating valves 11 and
REFERENCES:
patent: 2479359 (1949-08-01), Holt
patent: 4763959 (1988-08-01), Vandemotter
patent: 5447174 (1995-09-01), Bourkel et al.
Abstract of USSR Patent 1527051, Dec. 7, 1989.
Delfs Joachim
Leopold Ruediger
Seegis Claus
Greigg Edwin E.
Greigg Ronald E.
Hepperle Stephen M.
Knorr-Bremse, Systeme fur Nutzfahrzeuge GmbH
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