Railway rolling stock – Trucks – Bogie
Reexamination Certificate
1999-08-06
2001-06-19
Le, Mark T. (Department: 3617)
Railway rolling stock
Trucks
Bogie
Reexamination Certificate
active
06247413
ABSTRACT:
BACKGROUND ART
1. Field of the Invention
The invention relates to a pivoted bogie running gear for a rail-borne vehicle, and in particular, for a high speed train.
2. Description of the Related Art
A running gear of the above mentioned type is described for example in DE-C-2 145 738 in two different embodiments. The secondary spring system for the pendulum carrier is generally formed by air springs which sit on the frame of the running gear and support the pendulum carrier in the region of its lateral ends. The cross piece is connected to the pendulum carrier by means of a mechanical articulated arrangement in such a manner as to be able to pivot about a horizontal pivot axis, such that the pivot axis lies in the region above the cross piece in the body, e.g., at the passenger level. As a consequence, the tilt mechanism can be operated with minimum force expenditure. If the pivot axis is disposed above or below the center of gravity of the vehicle, then this causes a restoring force to return the tilt mechanism to its starting position. Since the tilt mechanism is disposed mechanically above the air springs, the mechanism is only slightly stressed by vibrations as these are to a great extent absorbed by the primary and secondary spring system. However, a disadvantage of this arrangement resides inter alia in the fact that the tilt mechanism with the secondary spring system requires substantial overall height which has proved to be disadvantageous.
A similar running gear is evident in DE 43 43 998 A1, in which a vehicle body cross piece which is not in the form of a frame is disposed on the pendulum carrier in a pivotable manner but not in a displaceable manner.
A tilt-adjusting mechanism with a secondary spring system for a pivoted bogie of a rail-borne vehicle which facilitates a low overall height is illustrated and described inter alia in EP 736 437 and EP 736 438. This tilt-adjusting mechanism comprises a pendulum carrier with a secondary spring system, the vehicle body being articulated directly to the pendulum carrier by way of a four-bar articulation, wherein hydraulic cylinders/piston units engage the upper side of the pendulum carrier at its two ends, and are supported at the associated lateral walls of the body at a distance above the pendulum carrier. A considerable disadvantage of this construction resides inter alia in the fact that by integrating the tilt-adjusting mechanism in the body construction, less passenger space and consequently less space for the seats is available. Moreover, in the case of such a construction both the running gear and also the body must be manufactured and assembled at one site. In addition, the body must be dimensioned accordingly in order to absorb the forces which occur, so that the production costs of such a body are increased. Since the points at which the force is introduced for the tilt-adjusting mechanism are comparatively high and as a consequence the distance from the center of gravity of the vehicle is less, it is necessary in order to tilt the body to overcome greater forces in an undesired manner.
In the case of a running gear according to DE 2 001 282 A, a comparatively complicated suspension is provided which comprises not only pendulums, but also angular levers and a connecting rod gearing. Two outer-lying actuators are provided in front of and behind the frame respectively.
SUMMARY OF THE INVENTION AND ADVANTAGES
The invention relates to a pivoted bogie running gear assembly for a rail-borne vehicle and, in particular, a high speed train. The running gear assembly includes a two-axle traveling gear which is attached by way of a primary spring system to a frame. The frame is aligned transversely with respect to the longitudinal direction of the vehicle. The frame is connected to a transverse-lying cross piece by way of a four-bar articulation pendulum mounting in such a manner as to be able to pivot about an axis extending in the longitudinal direction of the vehicle. In the case of the four-bar articulation pendulum mounting, two pendulums are disposed in a trapezoidal manner—as seen from the front or from behind. The two pendulums are symmetrical with respect to the longitudinal middle plane of the running gear assembly. The lateral distance of the articulation points of the pendulum at the pendulum carrier is less than the lateral distance of the underlying articulation points of the pendulums at the cross piece. The body of the vehicle can be placed directly on the cross piece and an active tilt-adjusting device including at least one actuator, e.g., a cylinder/piston unit is disposed in a transverse manner with respect to the longitudinal direction of the vehicle and in a substantially horizontal manner.
It is therefore an object of the present invention to improve a pivoted bogie running gear for a rail-borne vehicle of the type mentioned in the introduction in such a manner that a compact arrangement requiring as little as possible overall length and height can be achieved while providing a clear and simple interface with the vehicle body.
This object is achieved in the case of a pivoted bogie running gear of the type mentioned in the introduction in accordance with the invention by virtue of the fact that the cross piece is in the form of a frame comprising two traverse crossbars which are aligned in a transverse manner with respect to the longitudinal direction of the vehicle and are disposed in front of or behind the pendulum carrier and that these traverse crossbars can be supported in the longitudinal direction of the vehicle on the pendulum carrier and are disposed thereon in such a manner as to be displaceable in a transverse manner with respect to the longitudinal direction of the vehicle. The frame-like arrangement of the cross piece for the vehicle body renders it possible for the pendulum carrier and the cross piece to nestle one inside the other and for them to be disposed at a substantially identical height, so that the overall height of the running gear can be considerably reduced without modifications to the vehicle body being required. By arranging the cross piece around the pendulum carrier in a frame-like manner the cross piece can be manufactured so as to be sufficiently stable yet requiring a small volume of space in the longitudinal direction, which also renders it possible to achieve a running gear which has a short overall length.
An advantageous design of the running gear in accordance with the invention can be achieved in practice by virtue of the fact that to support and guide the traverse crossbars on the pendulum carrier in each case two friction plates are disposed symmetrically with respect to the longitudinal middle plane of the running gear and opposite flying friction surfaces are provided on each traverse crossbar. These friction plates/this arrangement of friction surfaces renders possible sufficient longitudinal entrainment and can be achieved in the sense of the most compact structure possible requiring a small amount of space.
A particularly advantageous embodiment of the pendulum is produced if each pendulum is manufactured from a plurality of spring steel sheets which lie in a two-dimensional manner one against the other and are articulated to the pendulum carrier or the cross piece in each case by means of a common pin. Since the spring steel sheets are highly resistant to extension in their longitudinal direction, the pendulums can be of an extremely narrow structure which further improves the compactness of the running gear. Furthermore, the pendulums are elastic transverse to the direction of pull, i.e. in the longitudinal direction of the vehicle and thus provide in an advantageous manner a certain degree of elasticity to compensate the tolerances between the pendulum carrier and the crossbar.
The pins for the pendulums can be mounted on the pendulum carrier or the cross piece in each case by means of a slide or roller bearing. In practice, it is of advantage if the pendulum mounting comprises four pendulums disposed in pairs, two pendulums respectively being disposed
Clark Hill PLC
Le Mark T.
Siemans SGP Verkehrstechnik GmbH
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