Railway rolling stock – Trucks – Bogie
Patent
1995-09-29
1997-09-30
Oberleitner, Robert J.
Railway rolling stock
Trucks
Bogie
1051991, 1051993, B61F 300
Patent
active
056716826
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a sway brace on rail vehicles. Sway braces are used for the parallel displacement of components on rail vehicles. These sway braces consist of oblong bodies whose ends have curved surfaces or Spherical surfaces and which are usually supported on plane pressure surfaces. For preventing a lateral displacement of the sway braces, guides are used whose one surface is formed by a cycloidal curve and whose other surface is formed by a circular cylinder.
Sway braces are known which the support is not rigid but is formed by two sleeves which can be telescoped into one another, a coil spring transmitting the supporting force from one part of the support to the other. Examples are shown in German Patent Documents DE 810 333 and 833 745.
The sway braces may be designed such that restoring forces occur which always lead the superstructure back into the center position. The extent of the restoring forces can be varied so that a side sway frequency can be achieved which is advantageous for the movement of the vehicle.
In order to avoid an excessive rolling angle during fast cornering or in order to prevent the unloading of wheels in the case of a suspension failure, supplementary springs are required which will start to operate after a defined spring travel of the main spring and render the overall suspension stiffer or, in the case of a failure of the main suspension, take over the suspension of the superstructure alone.
The known solutions have the disadvantage that the cycloidal curve for the one lateral guide surface is expensive to manufacture and that, in the case of resilient sway braces, additional guiding elements for absorbing transverse forces are required which are susceptible to wear and must therefore be lubricated. In addition, the lateral guide surfaces also must absorb certain transverse forces if, because of the telescope-type guiding, the two spherical caps no longer have the same center point as soon as the brace sways out of the center position.
Supplementary springs are known which are arranged in the main spring, such as the pneumatic spring, or around or next to the main spring.
These supplementary springs have the disadvantage that, when they are operative, they considerably hinder the side swaying of the superstructure and therefore impair the running quality in the horizontally transverse direction.
It is an object of the invention to provide a solution in which the expenditures required for manufacturing the resilient sway brace are lowered, the transverse forces occurring on deflection and the corresponding wear are reduced to a minimum and in which the supplementary spring, even after it has become operative, has no influence on the side swaying of the superstructure.
According to the invention, this object is achieved in that one end of the resilient sway brace which has a special design is arranged in a support with defined guide surfaces, while the other end, by way of an axial rocker bearing, is fastened to the piston of a hydraulic cylinder. Above the piston of a sway brace with a sprung support, a supplementary spring, expediently a disk spring column, is arranged against which the piston runs after travelling along a defined path of the sprung support, .whereby the vertical spring rate of the superstructure suspension is increased and an excessive rolling angle is avoided, or against which the piston presses in the case of a pressure loss in the cylinder as a result of, for example, a line break so that the supplementary spring acts as an emergency spring. In both cases, the force resulting from the superstructure mass is introduced into the sway brace by way of the joint in the piston of the sway brace, whereby the side sway of the superstructure remains unaffected.
In the following, the invention will be explained by means of an embodiment .
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross sectional representation of the solution according to the invention;
FIG. 2 is a cross sectional view of the solution accor
REFERENCES:
patent: 3817186 (1974-06-01), Walsh
patent: 4324187 (1982-04-01), Sambo
patent: 4456233 (1984-06-01), Muller
Babnik Klaus-Henning
Holzl Stefan
Philipp Roland
Reichert Peter
Bartz C. T.
Knorr Bremse AG
Oberleitner Robert J.
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