Railway rolling stock – Trucks – Bogie
Reexamination Certificate
1999-04-01
2001-08-14
Morano, S. Joseph (Department: 3617)
Railway rolling stock
Trucks
Bogie
C105S199200, C105S199300, C105S413000
Reexamination Certificate
active
06273002
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a rail with a support actuator of variable vertical length.
2. Brief Description of the Prior Art
The provision of spring elements arranged mechanically parallel to each other or in series to support a vehicle body on a running gear located thereunder is generally known in the context of rail vehicles. If one of the spring elements fails, the effect of the associated second spring element is maintained. In parallel arrangements, however, this involves a considerable reduction of supporting force, while a series arrangement results in a great overall length in the effective direction.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing by suitable measures a rail with a support actuator of variable vertical length acting as a support spring and mounted between a vehicle body and the frame of a running gear located thereunder wherein one spring element only is effective in the usual operating conditions while maintaining a compact construction.
In constructing a rail vehicle according to the invention, the emergency spring, which is parallel in action to the support actuator in operative use, is loaded only when the support actuator at least largely loses its resilient supporting function. Only then does the stop connected to the end of the support actuator, which is adjustable relative to the emergency spring, come into contact with the adjacent end face of the emergency spring. In the usual operating conditions, the action of the support actuator is therefore not influenced in any way. If, on the other hand, the support actuator fails, the emergency spring absorbs the full load of the vehicle body, which merely drops to a lower level. The emergency spring can thus be matched to the actual body load by mechanical prestressing and limiting its stroke, thus ensuring the clearance between emergency spring and stop which is required for the normal working stroke. The actuator is in particular a hydropneumatically controlled cylinder with corresponding resilience, the force or extension to be applied being controlled in dependence on operating conditions. The cylinder housing of the actuator is preferably rigidly fixed to the running gear frame, on which one end of the emergency spring is seated as well. The stop associated with the piston rod of the actuator can be attached directly to the piston rod. Preferably, however, it is connected to the free end of the piston rod by way of a flexible joint designed as a ball joint. In this way, the stop can be firmly attached to a plate of a sliding adapter, the counter-plate of which is firmly attached to the floor of the vehicle body while being freely adjustable in one plane relative thereto. The sliding adapter may in particular be designed as a ball table. It is only adjustable parallel to the plane of the floor of the vehicle body.
The emergency spring is preferably cylindrical in design and co-axial with the cylinder housing. The stop, too, is cylindrical and matched in diameter, so that it comes to rest without tilting on the adjacent end face of the emergency spring during any failure of the actuator and is capable of compressing the emergency spring while clearing the external surface of the cylinder housing.
To limit the stroke of the mechanically prestressed emergency spring, a limiting stop consisting of several parts, if required, is provided, which extends in front of the end of the emergency spring facing the stop, while its other end is attached to the running gear frame. In this arrangement, lateral buckling is prevented by the fact that the emergency spring is guided both by the cylinder housing of the support actuator and by those parts of the supporting stop which are located in the outer area of the emergency spring.
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Benker Thomas
Hachmann Ulrich
Sch{overscore (u)}ller Uwe
ABB Daimler-Benz Transportation (Technology) GmbH
Jules Frantz F.
Morano S. Joseph
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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