Railway rolling stock – Trucks – Axle bearing mounting
Patent
1998-06-22
2000-08-08
Le, Mark T.
Railway rolling stock
Trucks
Axle bearing mounting
B61F 500
Patent
active
060985518
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a twin-axle rail vehicle bogie.
2. Description of the Related Art
Conventional bogies are known which are provided with a bogie frame comprising a cross beam extending transversely to the direction of travel and longitudinal beams being attached to the cross beam and extending in the direction of travel. Conventionally, the cross beam supports a centrally arranged pivoted bolster serving to connect the bogie to the bottom side of the vehicle so that it is pivotal about the vertical axis. The two wheel sets are externally hingedly connected to a main suspension system with a substantially vertically directed spring force. Conventionally, the upper, free end of the suspension system is hingedly connected to the longitudinal beam. Furthermore, the wheel set is hingedly connected to the bogie frame by longitudinal control arms for the transfer of longitudinal forces. In order to achieve a suitable rigidity of the bogie frame, conventional longitudinal beams used to be linked with each other on their outer free ends by additional cross beams, so that in fact a closed frame was used.
For certain special vehicles, however, it was desirable to make the bogies light, as compact as possible and of particularly small overall height. For these purposes, it was desirable to use wheels of smaller diameter, which, however, led to problems with regard to derailment safety. Therefore, a considerable static spring deflection height of the wheel set in connection with a hydraulic oscillation damper system had to be provided. As a consequence, the vertically extending main suspension system had to be made accordingly large, resulting in an undesirably great overall height. Apart from that, the conventional bogie frame with longitudinal beams was relatively heavy and of great overall height, which is also due to the fact that the longitudinal beams of the conventional bogie frame were required to extend in a position above the wheel in order to accommodate the springs.
The DE-AS 24 44 887 discloses a bogie for rail vehicles which is included in the generic category, with a link being hingedly connected to a bogie cross beam at one of its free ends and supporting the wheel set bearing on its other free end. Suspension is effected by leaf springs entending below the link.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a twinaxle rail vehicle bogie of the above described type, which meets high requirements regarding derailment safety, and which at the same time comprises the smallest possible structural dimensions and lowest possible weight, and in particular a small overall height.
According to the present invention, this is achieved by the features defined in the characterizing part of claim 1. Advantageous embodiments are described in the dependent claims.
In other words, according to the present invention the conventional longitudinal beams which are arranged on each longitudinal side of the bogie are each replaced by a first and a second link. Wheel set shaft bearings, which may advantageously be in the form of anti-friction bearings accommodated in plummer blocks, are screw-fitted to these two links. The two links on each side of the bogie are commonly fastened to the bogie cross beam, so that they are capable of oscillating relative to each other. Thus, forces are transmitted via the plummer blocks from the wheel contact points on the rails to the links, with the links mutually supporting each other through a suspension system installed inbetween them.
In this way, it is possible to provide a considerable spring deflection height of the wheel sets in spite of the very small overall height, thus ensuring a high derailment safety. In addition, a reduction in weight is achieved because of the simpler structure of the bogie frame. Furthermore, a small axle base is achieved, making the bogies according to the present invention particularly suitable for the transport of tall loads without exceeding the permissib
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Le Mark T.
Maschinen, Apparate-und Geratebau
Newag GmbH & Co. KG
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