Railway rolling stock – Trucks – Bogie
Reexamination Certificate
1999-04-27
2001-09-18
Morano, S. Joseph (Department: 3617)
Railway rolling stock
Trucks
Bogie
C105S158200, C105S182100, C105S200000
Reexamination Certificate
active
06289821
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a rail vehicle, i.e. a vehicle that travels on the rails, and, more particularly, to a streetcar or a metropolitan transit car for local traffic, in which a car body and an undercarriage are connected with each other by means of at least one guide rod extending in a longitudinal direction.
The word “undercarriage” herein means driven and non-driven undercarriages with two or four wheels, which are connected pair-wise by means of a wheel shaft or which are free wheels, as well as drive bogies, trailing bodies and/or driven carriages.
Many different streetcars and metropolitan transit cars in six or eight axle embodiments are known in practice and from the professional literature. Usually a driven undercarriage is located under the head portion of the car body in this type of car, so that at least one non-driven undercarriage can be located in a middle region of the car. In order to prevent one-sided wheel wear, which is especially common with travel in one direction, the undercarriage is reversed or turned around after traveling, for example, 80,000 km or about once per year. Also the driven undercarriage can be released from its place at the head region of the car body and mounted under the other head region after being rotated about 180°. No greater difficulties are encountered in assembling the guide rods and other mechanically and electrically interfacial parts during the above-described reversal of the driving undercarriage because of the symmetry of the car body shape.
Subway vehicles formed from passenger-containing modules and undercarriage modules, which each have a car body and an undercarriage connected with each other by at least one guide rod extending in a longitudinal direction, are part of the state of the art as seen, for example, from the journal “Der Nahverkehr (Local Transit)”, pp. 79 to 82, 10/95. FIG. 4 on page 81 of this journal shows a drive undercarriage with a guide rod of a guide rod pair, in which the opposite guide rod is covered by the undercarriage frame in the view. This FIG. 4 also shows a transverse shock absorber, which effects the transverse motion of the car body relative to the undercarriage, which is usually limited by an unshown mechanical stop device.
SUMMARY OF THE INVENTION
The invention is based on the understanding that it is desirable in regard to the reversal of the running direction of the undercarriage, to design the interfacial parts for the undercarriage, especially the guide rods, so that the respective undercarriages can be rapidly and easily rotated about 180° under the same car body (head region or assembly for the carriage module).
It is an object of the present invention to provide the necessary engineering features to fulfill this requirement.
This object and others which will be made more apparent hereinafter is attained in a rail vehicle, especially a streetcar or a metropolitan transit car for local traffic, in which a car body and an undercarriage are connected with each other by at least one guide rod extending in a longitudinal direction.
According to the invention a connector member of each guide rod facing the car body and a receptacle for it attached to the car body are arranged together in a central plane of the undercarriage extending perpendicularly to the vehicle longitudinal axis.
Because of the symmetry provided by the structure of the invention, in order to provide an advantageously rapid reversal or turning of the running direction of the undercarriage, it is only necessary to release the guide rod or rods from its receptacle or their receptacles and then to reconnect them. The receptacle guiding the motive power or force to the car body remain fixed on the car body. The vehicle can again receive passengers in a very short time again.
In an alternative form of the invention the connector member of each guide rod facing the car body has a longitudinal spacing from the central plane of the undercarriage that extents perpendicular to the vehicle longitudinal axis. The car body end of the receptacle or receptacles receiving the connector member or members is equipped with a connector piece that spans the longitudinal spacing and which is attached to the receptacle. The connector piece is displaced in front of or behind the central plane along the vehicle longitudinal axis.
Preferred embodiments of both forms of the invention are described hereinbelow and in the appended claims. A transverse shock absorber is provided in a symmetric manner in harmony with the objectives of the invention.
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Simsen Kommt Mit Der Combino by Alfred Kortemeyer and Werner Osterhus, in Der Nahverkehr, Oct. 1995, pp. 79-82.
Morano S. Joseph
Olson Lars A.
Siemens Duewag Schienenfahrzeuge GmbH
Striker Michael J.
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