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Dokumentenidentifikation EP1508490 29.06.2006
EP-Veröffentlichungsnummer 0001508490
Titel Reibungskeil eines Eisenbahndrehgestells, mit einer austauschbaren Belagträgerplatte
Anmelder Westinghouse Air Brake Technologies Corp., Wilmerding, Pa., US
Erfinder McCabe, Thomas W., 28387 North Carolina, US;
Formolo, Joseph F., 28353 North Carolina, US;
Shute, Bruce W., 27376 North Carolina, US
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60305487
Vertragsstaaten DE, FR, GB
Sprache des Dokument EN
EP-Anmeldetag 19.08.2003
EP-Aktenzeichen 032920464
EP-Offenlegungsdatum 23.02.2005
EP date of grant 24.05.2006
Veröffentlichungstag im Patentblatt 29.06.2006
IPC-Hauptklasse B61F 5/12(2006.01)A, F, I, 20051017, B, H, EP

Beschreibung[en]
FIELD OF THE INVENTION

The present invention relates, in general, to a wedge shaped friction casting that serves as a shock absorber in the suspension of railroad cars and, more particularly, the present invention relates to a composition liner bonded to a backing plate for such wedge shaped friction casting.

BACKGROUND OF THE INVENTION

The suspension of railroad trucks include a wedge shaped friction casting which serves as a shock absorber.

A suspension of this type is for example disclosed in EP 10 90 826.

The wedge is supported by a spring and works between the bolster and the side frame. The sloped face of the wedge maintains contact with a mating face of the bolster while the vertical face of the wedge slides against a metal wear liner on the side frame. The spring pushes on the bottom face of the wedge thereby providing the load to force the wedge between the bolster and the side frame. The friction between the wedge and the side frame wear plate provides damping for the truck suspension.

Certain truck designs use a wedge with a composition friction liner bonded to the vertical face of the wedge. This composition liner provides the desired friction characteristics, particularly static friction similar to dynamic friction. The difficulty encountered with this design has been in obtaining a satisfactory bond of the composition liner to the cast metal wedge. Various methods of gluing a molded sheet of composition material and of bonding the material to the casting have been used. Under the severe operating and environmental conditions of railroad service, the composition liner sometimes separates from the cast metal wedge.

SUMMARY OF THE INVENTION

The present invention, therefore, provides a friction wedge assembly for use in a suspension system of railroad car trucks. The friction wedge assembly comprises a cast metal wedge having a bottom face, a vertical face that is substantially perpendicular to the bottom face and a sloped face for contacting a mating surface on a bolster of such railroad car truck.

There is a metal backing plate that has a first side removably engageable with the vertical face of the cast metal wedge and a means for securing the metal backing plate to the cast metal wedge. There is further a composition liner disposed on a second side of the metal backing plate for engaging such metal wear liner on such side frame of such railroad car truck.

OBJECTS OF THE INVENTION

It is, therefore, one of the primary objects of the present invention to provide a composition liner with a backing plate for a friction wedge assembly to eliminate the need for bonding the composition material to the cast metal wedge.

Another object of the present invention is to provide a composition liner with a backing plate for a friction wedge assembly that can be replaced easily thereby renewing the wear surface without having to install a new wedge casting.

Still another object of the present invention is to provide a composition liner with a backing plate for a friction wedge assembly that will reduce the need for handling the heavy wedge casting.

Yet another object of the present invention is to provide a composition liner with a backing plate for a friction wedge assembly that will be easily made interchangeable with existing wedge castings.

Another object of the present invention is to provide a composition liner with a backing plate for a friction wedge assembly in which the bonding of the composition friction surface is improved.

It is yet another object of the present invention to provide a composition liner with a backing plate for a friction wedge assembly that can be installed without the need for special tools.

Still another object of the present invention is to provide a composition liner with a backing plate for a friction wedge assembly wherein the composition liner can be assembled to the wedge casting at any location.

Another object of the present invention is to provide a composition liner with a backing plate for a friction wedge assembly in which the friction wedge casting is cost effective.

Yet another object of the present invention is to provide a composition liner with a backing plate for a friction wedge assembly which will reduce maintenance.

These and various other objects and advantages of this invention will become apparent after a full reading of the following detailed description, particularly, when read in conjunction with the attached drawings as described below and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

  • Figure 1 is a sectional view of a friction wedge assembly with a composition wedge liner with a metal backing plate according to an embodiment of the invention.
  • Figure 2 is an exploded view of the friction wedge assembly with composition wedge liner with a metal backing plate according to an embodiment of the invention.

BRIEF DESCRIPTION OF THE PRESENTLY PREFERRED AND ALTERNATE EMBODIMENTS OF THE INVENTION

Prior to proceeding with the more detailed description of the present invention it should be noted that, for the sake of clarity, identical components which have identical functions have been designated by identical reference numerals throughout the several views illustrated in the drawings.

Illustrated in Figures 1 and 2 is a friction wedge assembly, generally designated 10, for use in a suspension system of railroad car trucks. Such friction wedge assembly 10 includes a cast metal wedge 1 that has a bottom face 2, a vertical face 4 that is substantially perpendicular to the bottom face 2 and a sloped face 6. The sloped face 6 contacts a mating surface on a bolster of such railroad car truck (not shown). Although it is presently preferred that such wedge 1 be a metal casting it is within the scope of the invention that such wedge 1 be of other material.

The present invention provides a metal backing plate 8 that has a first side that is removably engageable with the vertical face 4 of the cast metal wedge 1. There is also a means, generally designated 20, for securing the metal backing plate 8 to the cast metal wedge 1. A composition liner 12 is disposed on a second side of such metal backing plate 8 for engaging such metal wear liner (not shown) on such side frame of such railroad car truck.

In a presently preferred embodiment of the invention such means 20 for securing the metal backing plate 8 to the cast metal wedge 1 includes a locking tab 14. Such locking tab 14 on the metal backing plate 8 is designed to protrude through a mating aperture 16 in the cast metal wedge 1. The locking tab 14 is secured to the cast metal wedge 1 by one of a cotter pin (not shown) which can be inserted in the opening in the locking tab 14 and by simply manually bending the locking tab 14. In a presently preferred embodiment of the invention such locking tab 14 is simply bent manually to hold the backing plate 8 and composition liner 12 in place on the cast metal wedge 1.

Thus, the use of the locking tab 14 permits for easy insertion but resists removal. This attachment feature, locking tab 14, need only hold the composition liner 12 and backing plate 8 in place on the cast metal wedge 1 until it is installed in the railroad car truck. Thereafter, the composition liner 12 is constrained between the cast metal wedge 1 and the metal wear liner on the railroad car truck frame. The composition liner 12, according to the present invention, can be replaced easily and thereby have a renewed wearing surface without the necessity of installing a completely new wedge casting or having the wedge casting sent out to have a new liner molded directly to it as is presently done. In an embodiment of the invention such locking tab 14 is formed integrally with the backing plate as a punching.

The backing plate 8, according to an embodiment of the invention, further includes a shallow lip 22 that is disposed substantially around the exterior of the backing plate 8 and is substantially perpendicular to the second side of the backing plate 8. Such shallow lip 22 partially encloses the composition liner 12 and keeps it in place even in the event of a loss of bond between the composition liner 12 and such metal backing plate 8. Additional features could be incorporated into the second side of the backing plate 8 that could create a mechanical interlock between the metal backing plate 8 and the composition liner 12. However, in a presently preferred embodiment of the invention such composition liner 12 is bonded to the second side of the metal backing plate 8.

The metal backing plate 8 also incorporates locating features on the first side which is the side that is engageable with the cast wedge assembly 1. The locating features include at least one locating pin 18 which mates with an aperture(s) on the vertical side 4 of the cast metal wedge 1 and permit the proper positioning of the metal backing plate 8 to the cast metal wedge 1. It is presently preferred that there are a plurality of locating pins 18 on the backing plate 8. It is further preferred that such plurality of locating pins 18 are four on such first side of such metal backing plate 8. It is also preferred that there be a plurality of matching apertures on the vertical side of the cast metal wedge 1. It is further preferred that this plurality be four mating apertures for the locating pins 18 on the vertical side 4 of the cast metal wedge 1.

These locating pins 18 serve both to accurately locate the composition liner 12 and backing plate 8 on the cast metal wedge 1 and to take the shear load between the cast metal wedge 1 and the backing plate 8 with the composition liner 12, keeping the assembly in place while in service. The shear strength of this arrangement is much higher than that found in prior art. To accept the new backing plate 8 and composition liner 12 the cast metal wedge 1 need only have suitable mating holes drilled into its vertical face. New castings can be produced with the holes cast in place, needing only a finish drilling to provide suitable tolerances for the locating pins 18. In this manner, existing cast metal wedges 1 can be modified at very low cost and new castings produced with only minor additional work. The present invention has the same overall dimensions as prior art liners; therefore, the operation of such complete friction wedge assembly 10 is identical to one utilizing prior art.

The present invention provides a composition liner 12 that is bonded to a metal backing plate 8 that mechanically connects to a modified cast metal wedge 1. This allows the use of a metal for the metal backing plate 8 which provides a superior bond to the composition material of the composition liner 12, compared to the bond with the cast metal that is used in the wedge. Also there are features included in the backing plate 8 which further improve the bond and hold the composition liner 12 in place even if the bond should fail. Such backing plate 8 and composition liner 12 can be replaced easily, when required, without the need of any special equipment or tools which should reduce maintenance costs.

While both the presently preferred and a number of alternative embodiments of the present invention have been described in detail above it should be understood that various other adaptations and modifications of the present invention can be envisioned by those persons who are skilled in the relevant art of railway braking systems without departing from the scope of the appended claims.


Anspruch[de]
Reibungskeilanordnung (10) für ein Federungssystem von Elsenbahnwagendrehgestellen, wobei die Relbungskeilanordnung folgendes umfaßt: (a) einen Keil mit einer unteren Fläche (2), einer zu der unteren Fläche (2) im wesentlichen vertikalen Fläche (4) und eine anstelgende Fläche (6) zum Kontaktnahme mit einer entsprechenden Fläche an einer Wiege dieses Elsenbahnwagendrehgestells, (b) eine Stützplatte (8) aus Metall mit einer im wesentlichen planaren ersten Seite, die lösbar mit der vertikalen Fläche des Keils (1) In Eingriff gebracht werden kann, wobei die Stützplatte des weiteren eine flache Lippe (22) umfaßt, welche im wesentlichen um die zweite Seite herum und im wesentlichen senkrecht zu dieser angeordnet ist, wobei die flache Lippe (22) zum Teil (c) eine Verbundauskleidung (12) einschließt, welche auf einer zweiten Seite der Stützplatte (8) aus Metall angeordnet ist, um in eine Verschieißauskieidung aus Metall an einem Seitenrahmen dieses Eisenbahnwagendrehgestells einzugreifen,

dadurch gekennzeichnet,
(d) daß die vertikale Fläche (4) eine im wesentlichen planare Fläche aufweist, welche lösbar mit der planaren ersten Seite der Stützplatte aus Metall In Eingriff gebracht werden kann und eine Mehrzahl von Öffnungen definiert, (e) daß an der Stützplatte (8) aus Metall eine Verriegelungslasche (14) angeordnet, ist, wobei die Verriegelungslasche (14) zum Befestigen der Stützplatte (8) aus Metall an dem Keil mit einer der Öffnungen zusammenwirkt, und (f) daß gesondert von der Verriegelungslasche mindestens ein Positionierstift (18) an der Stützplatte aus Metall angeordnet Ist und mit einer der Öffnungen zusammenwirkt, um die Stützplatte (8) aus Metall richtig mit dem Kell (10) zu positionieren, wobei der Positionierstift (18) ausgelegt ist, um die Scherbelastung zwischen dem Keil (1) aus Metallguß und der Stützplatte (8) aufzunehmen.
Reibungskeilanordnung nach Anspruch 1, wobei der Kell (1) ein Metallgußteil ist. Reibungskeilanordnung nach Anspruch 1 oder 2, wobei die Verriegelungslasche (14) an der Stützplatte (8) aus Metall durch eines von einem Splintbolzen und Biegen der mindestens einen Verriegelungslasche (14) an dem Kell (1) befestigt ist. Reibungskeilanordnung nach einem der Ansprüche 1 bis 3, wobei die mindestens eine Verriegelungslasche (14) einstückig mit der Stützplatte (8) als Stanztell ausgebildet ist. Relbungskeilanordnung nach einem der Ansprüche 1 bis 4, wobei die Verbundauskleidung (12) mit der zweiten Seite der Stützplatte (8) aus Metall verklebt ist. Relbungskeilanordnung nach einem der Ansprüche 1 bis 5, wobei die erste Seite der Stützplatte (8) aus Metall eine Mehrzahl von Positionierstiften (18) enthält, um die Stützplatte (8) aus Metall richtig mit dem Keil (1) zu positionieren. Relbungskeilanordnung nach Anspruch 6, wobei die Mehrzahl von Öffnungen und Positionierstiften (18) mindestens vier beträgt. Relbungskeilanardnung nach einem der Ansprüche 1 bis 7, wobei die Mehrzahl von Positionierstiften (18) in den Keil (1) hineinragt. Relbungskeilanordnung nach einem der Ansprüche 1 bis 8, wobei die Mehrzahl von Öffnungen und Positionierstiften fünf beträgt.
Anspruch[en]
A friction wedge assembly (10) for a suspension system of railroad car trucks, said friction wedge assembly comprising: (a) a wedge having a bottom face (2), a vertical face (4) substantially perpendicular to said bottom face (2) and a sloped face (6) for contacting a mating surface on a bolster of such railroad car truck, (b) a metal backing plate (8) having a substantially planar first side removably engageable with said vertical face of said wedge (1), said backing plate further includes a shallow lip (22) disposed substantially around and substantially perpendicular to said second side, which shallow lip (22) partially encloses, (c) a composition liner (12) disposed on a second side of said metal backing plate (8) for engaging a metal wear liner on a side frame of such railroad car truck,

characterized in
(d) that the vertical face (4) has a substantially planar surface, which is removably engageable with said planar first side of said metal backing plate and which defines a plurality of apertures, (e) that a locking tab (14) is disposed on said metal backing plate (8), which locking tab (14) cooperates with one of said apertures for securing said metal backing plate (8) to said wedge, and (f) that at least one locating pin (18), distinct from the locking tab, is disposed on said metal backing plate and cooperating with one of said apertures for proper positioning of said metal backing plate (8) with said wedge (10), which locating pin (18) is adapted to take the shear load between the cast metal wedge (1) and the backing plate (8).
A friction wedge assembly, according to claim 1, wherein said wedge (1) is a metal casting. A friction wedge assembly, according to claim 1 or 2, wherein said locking tab (14) on said metal backing plate (8) is secured to said wedge (1) by one of a cotter pin and bending of said at least one locking tab (14). A friction wedge assembly, according to anyone of claims 1 to 3, wherein said at least one locking tab (14) is formed integrally with said backing plate (8) as a punching. A friction wedge assembly, according to anyone of claims 1 to 4, wherein said composition liner (12) is bonded to said second side of said metal backing plate (8). A friction wedge assembly, according to any one of claims 1 to 5, wherein said first side of said metal backing plate (8) includes a plurality of locating pins (18) for proper positioning of said metal backing plate (8) with said wedge (1). A friction wedge assembly, according to claim 6, wherein said plurality of apertures and locating pins (18) is at least four. A friction wedge assembly, according to any one of claims 1 to 7, wherein said plurality of locating pins (18) protrude into said wedge (1). A friction wedge assembly, according to any one of claims 1 to 8, wherein said plurality of apertures and locating pins is five.
Anspruch[fr]
Agencement de coin de friction (10) pour un système de suspension de bogies de wagons, ledit agencement de coin de friction comprenant : (a) un coin ayant une face de fond (2), une face verticale (4) sensiblement perpendlculalre à ladite face de fond (2) et une face inclinée (6) destinée à entrer en contact avec une surface correspondante sur une traverse dudit bogie de wagon, (b) une plaque de support métallique (8) comportant un premier côté sensiblement plat venant en prise de manière amovible avec ladite face verticale dudit coin (1), ladite plaque de support comprenant en outre une lèvre peu profonde (22) placée sensiblement autour dudit second côté que la lèvre peu profonde (22) enferme partiellement et de manière sensiblement perpendiculaire à celui-ci, (c) un revêtement de composition (12) placé sur un second côté de ladite plaque de support métallique (8) pour venir en prise avec un revêtement d'usure métallique sur un châssis latéral dudit bogie de wagon,

caractérisé en ce que
(d) la face verticale (4) présente une surface sensiblement plate, qui peut venir en prise de manière amovible avec ledit premier côté plat de ladite plaque de support métallique et qui définit une pluralité d'ouvertures, (e) une languette de verrouillage (14) est placée sur ladite plaque de support métallique (8), laquelle languette de verrouillage (14) coopère avec l'une desdites ouvertures pour fixer ladite plaque de support métallique (8) audit coin, et (f) au moins une tige de positionnement (18), distincte de la languette de verrouillage, est placée sur ladite plaque de support métallique et coopère avec l'une desdites ouvertures pour assurer un bon positionnement de ladite plaque de support métallique (8) par rapport audit coin (10), laquelle tige de positionnement (18) est adaptée pour prendre la charge de cisaillement entre le coin en fonte (1) et la plaque de support (8).
Agencement de coin de friction selon la revendication 1, dans lequel ledit coin (1) est un produit de fusion du métal. Agencement de coin de friction selon la revendication 1 ou 2, dans lequel ladite languette de verrouillage (14) sur ladite plaque de support métallique (8) est fixée audit coin (1) au moyen d'une clavette ou du pilage de ladite au moins une languette de verrouillage (14). Agencement de coin de friction selon l'une quelconque des revendications 1 à 3, dans lequel ladite au moins une languette de verrouillage (14) est formée en une pièce avec ladite plaque de support (8), par exemple par un emboutissage. Agencement de coin de friction selon l'une quelconque des revendications 1 à 4, dans lequel ledit revêtement de composition (12) est lié audit second côté de ladite plaque de support métallique (8). Agencement de coin de friction selon l'une quelconque des revendications 1 à 5, dans lequel ledit premier côté de ladite plaque de support métallique (8) comprend une pluralité de tiges de positionnement (18) pour assurer le bon positionnement de ladite plaque de support métallique (8) par rapport audit coin (1). Agencement de coin de friction selon la revendication 6, dans lequel ladite pluralité d'ouvertures et de tiges de positionnement (18) est au moins égale à quatre. Agencement de coin de friction selon l'une quelconque des revendications 1 à 7. dans lequel ladite pluralité de tiges de positionnement (18) falt saillie dans ledit coin (1). Agencement de coin de friction selon l'une quelconque des revendications 1 à 8, dans lequel ladite pluralité d'ouvertures et de tiges de positionnement est égale à cinq.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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