Spring devices – Vehicle – Comprising compressible fluid
Patent
1995-05-22
1998-06-23
Butler, Douglas C.
Spring devices
Vehicle
Comprising compressible fluid
280707, 280708, 303 3, 1051992, B60T 1702, B60G 17015, B61F 510, B61F 300
Patent
active
057694001
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a height and inclination control of a wagon box, and more particularly to a wagon box of a rail vehicle, comprising a rail-borne bogie which, in addition to having steel springs, is cushioned by hydropneumatic springs or is cushioned only by hydropneumatic springs.
Hydropneumatic spring systems of this type are known from German Patent Document DE-OS 38 33 922, corresponding to U.S. Pat. No. 5,074,624. In each of its bogies, the height controlling spring system known from this document has a hydraulic pressure supply unit from which, in a mutually parallel manner, by way of pressure protection valves, the hydraulic brake as well as the hydropneumatic spring system of the respective bogies are supplied with pressure. The return flow pipes of the electrohydraulic brake and of the hydropneumatic spring system lead to an unpressurized hydraulic tank. In this case, oil volumes required for the height control are always taken from an accumulator. After it was partially emptied, this accumulator is filled up again, as required, specifically when the accumulator pressure has fallen below a predetermined value. This process has the effect that the pump must always work against a stored accumulator pressure which, however, is always above the pressure in the spring system. Thus, the energy requirements are relatively high in this type of height control so that it appears to be necessary to reduce this energy consumption.
Currently, hydropneumatic suspensions (HPS) are mainly used in motor vehicles. These HP-suspension systems normally have a mechanical height control. The pressure supply of the systems usually takes place by way of a central vehicle hydraulic system.
Up to now, hydropneumatic suspensions have been very rare in rail vehicles. In rail-borne vehicles, systems of this type must meet various requirements. Thus, the HP-spring system must be able to master a relatively large ratio of vehicle weights (loaded/empty of approximately 1.5 to 3). In addition, in the case of a change of passengers at stops, the vehicle height must be held approximately constant. This makes high demands on the speed of the height regulator. In addition, large amounts of oil must be fed into the hydraulic loops within a short time and must be drained from them within a short time. In addition, the influences of the dynamics of the vehicle movement must be recognized by the regulator in order to prevent a response to the regulator, for example, during spring movements or cornering.
The energy consumption of the overall system should therefore be relatively low in order to, on the one hand, minimize the size of the hydro-equipment and, on the other hand, be able to supply the whole system from the battery.
It is therefore an object of the present invention to move large quantities of oil in the hydraulic loops within a relatively short time; in which case the energy consumption of the overall system is as low as possible and the size of the hydro-equipment is therefore small.
According to the invention, this object is achieved in a system for the control of the height and the inclination of a wagon body for vehicles, particularly rail vehicles, having at least one hydropneumatically controlled suspension damping system which comprises sensors which sense the height as well as the inclination of the wagon body, and the signals of the sensors are fed to an electric control system also pump which operates directly against the pressure (p.sub.HPS) of an HPS-pressure accumulator of the suspension damping system and pressure medium is removed from the accumulator, filled during the travel only, when the delivery volume of the pump is not sufficient for keeping the height of the wagon body constant.
The arrangement developed according to this process of the invention is characterized in that it body; against an HP-accumulator which is known per se.
Additional advantageous further developments of the invention are found in the subclaims.
The approach taken according to
REFERENCES:
patent: 3871680 (1975-03-01), Ito et al.
patent: 3873123 (1975-03-01), Joneleit
patent: 3896740 (1975-07-01), Kreissig
patent: 4655440 (1987-04-01), Eckert
patent: 5074624 (1991-12-01), Stauble et al.
patent: 5159881 (1992-11-01), Durand et al.
patent: 5342023 (1994-08-01), Kuriki et al.
patent: 5671682 (1997-09-01), Holzl et al.
Japanese Abstract from Japanese Application No. JP00063743, dated Mar. 14, 1990 for Hydraulic Pneumatic Suspension, by Hino Motors, Ltd.
Holzl Stefan
Hommen Winfried
Oberthur Ralf-Christian
Stauble Georg
Butler Douglas C.
Knorr-Bremse AG
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