Railway rolling stock – Trucks – Bogie
Patent
1993-11-09
1995-05-23
Le, Mark T.
Railway rolling stock
Trucks
Bogie
105185, 1051902, 105207, B61F 500
Patent
active
054171636
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a bogie comprising two sole-bars between which extend at least two axles and, between the latter, a bolster, each end of which is joined respectively to one of the sole-bars by an articulated linkage.
BACKGROUND OF THE INVENTION
Such bogies are used for travelling over tracks in bad condition. The greatest inequalities at least are absorbed not by the clearance of a suspension between axle and sole-bar but by an equalising movement of the sole-bar in its vertical plane.
However, this type of chassis has the drawback of permitting numerous parasitic movements and, especially, movements according to which each sole-bar has the tendency continuously to overtake the other or be overtaken by it. In oscillatory mode, this type of movement leads to a sideways-motion trajectory of the assembly of the vehicle and, possibly, a derailment.
THE KNOWN PRIOR ART
Numerous examples are known, for example from U.S. Pat. Nos. 2,853,958 and 2,702,512 or FR-A-2 644 743, of such linkages which form at the same time a suspension and which comprise for this purpose springs bearing on the sole-bars. Some of these springs hold the bolster up directly. Others hold up the bolster by means of a wedge which generates a horizontal reaction used for stabilizing the suspension in various ways. These articulations are relatively complicated. The horizontal forces there are of course proportional to the load supported but, however, they are only generated by a small portion of the load supported by the bogie.
FR-A-22 01 999 relates to a wedgeless articulation. The bolster bears on the sole-bars by means of elastic blocks having an arched shape or a v-shape which tends to favour the configuration in which the two sole-bars are perpendicular to the bolster. However, the stability of the favoured configuration is very poor, especially as any deviation in relation to this configuration leads, of course, to an overcompression of a portion of the elastic blocks but also a spring back of another portion of the same elastic blocks.
A bogie is known, again from FR-A-26 34 714, in which prestressed elastic blocks act in an oblique horizontal direction in order to apply a vertical face of the bolster, opposite these blocks, against a corresponding reference face of the sole-bars, perpendicular to the longitudinal direction of the bogie. This disposition has the drawback of requiring the reference faces to lift off from each other when the sole-bar performs its equalising movement in the vertical plane in relation to the bolster. Furthermore, the return to the preferred configuration is independent of the load supported by the bogie, which is a drawback since the tendency of the bogie to assume undesirable configurations increases with the load supported by the bogie.
OBJECT OF THE INVENTION
The object of the invention is thus to provide a bogie whose sole-bars are articulated to the bolster with great freedom to perform their equalising movements in their vertical planes whilst being very effectively prevented from pivoting in the horizontal plane in relation to the said bolster.
SUMMARY OF THE INVENTION
According to the invention, the railway bogie comprising two sole-bars between which extend at least two axles and, between the latter, a bolster, each end of which is joined respectively to one of the sole-bars by a wedgeless articulated linkage which transmits the weight of the vehicle supported by the bolster to the sole-bar whilst permitting the sole-bar clearance movements in a plane perpendicular to the longitudinal direction of the bolster, is characterised in that:
a lateral reference face belonging to the sole-bar is in frictional contact with a conjugate reference face belonging to the bolster, these lateral and conjugate reference faces being transverse to the longitudinal direction of the bolster; and
the articulated linkage is arranged in order that the bolster transmits, to the sole-bar, through the action of the said portion of the weight of the vehicle, a force havin
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Le Mark T.
Sambre et Meuse (Societe Anonyme)
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