CA1039577A - Railway truck pedestal roof wear plate - Google Patents
Railway truck pedestal roof wear plateInfo
- Publication number
- CA1039577A CA1039577A CA224,644A CA224644A CA1039577A CA 1039577 A CA1039577 A CA 1039577A CA 224644 A CA224644 A CA 224644A CA 1039577 A CA1039577 A CA 1039577A
- Authority
- CA
- Canada
- Prior art keywords
- plate
- pedestal
- roof
- wear plate
- weldment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
Railway truck side frame having a pedestal jaw roof containing a flat wear plate within a contained area which will shift the burden of wear elsewhere. The contained area is provided by vertical, longitudinally extending, peripheral lips on each side of the pedestal roof between the downstanding sidewalls. The flat wear plate is secured to the pedestal roof with a weldment at the side surfaces of the plate, the weldment extending substantially the length of the plate and, downwardly, the weldment extending no lower than the vertical peripheral lips.
Railway truck side frame having a pedestal jaw roof containing a flat wear plate within a contained area which will shift the burden of wear elsewhere. The contained area is provided by vertical, longitudinally extending, peripheral lips on each side of the pedestal roof between the downstanding sidewalls. The flat wear plate is secured to the pedestal roof with a weldment at the side surfaces of the plate, the weldment extending substantially the length of the plate and, downwardly, the weldment extending no lower than the vertical peripheral lips.
Description
Attempts were first made to secure wear plates to the roofs of pedestal jaws of railway truck side frames by two methodsJ
namely, flllet welding the wear plates to flat horizontal surfaces along the edges of the wear plates and plug welding the plate to the pedestal roof. Later, two additional techniques were tried.
First, a preformed plate, made from spring steel, was simply snapped on the sides of the pedestal roof. Second, a "U" shaped plate was attached by fillet welds between the upstanding legs of the wear plate and the sides of the frame.
Wear plates attached to the horizontal surface of the pedestal roof with fillet welds do not have an alternate mechanical retaining system; i.e., lugs, bosses, to restrain the plate in the event of weld failure, thus allowing loss of the plate when welds fail. It appears probable that due to the limitations of geometric configuration, the welds fail because an insufficient amount of wèld has to be applied.
. The so called plug welded applications also include the design ;
having bosses on the pedestal roof with mating holes in the wear plate. Because of pedestal jaw design as specified by the American Association of Railroads, the design of the prior art wear plates has been limited to a maximum plate thickness of 3/16 inch which limits the strength of the attachment weld. A common specification for such a spring steel plate is 0.109 inch thick AISI 1095 steel, which has a short fatigue life. Anything other than an excellent fit between pedestal roof and wear plate will most likely result in the initiation of a fatigue crack in either the plate or attachment welds.
The "U" plate design would be very difficult to fit to the jaw of the side frame due to manufacturing tolerances inherent in the casting process. The rocking action of the truck side frame on the journal bearing adapter in combination with vertical impact forces will most likely result in attachment weld failures.
~6~3~577 The plate will then be allowed to move relative to the pedestal roof resulting in an ineffective application.
Accordin~ly, it is among the objects of the invention to provide an improved wear plate design for the roof of the pedestal jaw of a railway truck side frame.
In the Drawings. Fig. 1 is an elevation view of one of the pedestal jaws of a truck side frame;
Fig. 2 is a plan view of the same construction;
Fig. 3 is a cross sectional view of a section taken along line 3-3 of Fig. l; and, Figs. 4 and 5 are elevation views showing other embodiments of the invention.
In accordance with the present invention~ there is provided a railway truck side frame having a ~ournal box housing and a pair of pedestal jaws for engaging wheel axles on a railway car. The jaws, two in number, have a roof and downstanding sidewalls. The pedestal roof of the pedestal jaws has vertical, longitudinally extending, peripheral lips on each side thereof between downstanding sidewalls. A relatively flat wear plate is secured to the pedestal roof with a weldment at the side surfaces of the plate. The weld-ment extends substantially the length of the plate and, downwardly, the weldment extends no lower than the vertical peripheral lips.
The above construction was tested and satisfactory performance was exhibited at more than 200,000 cycles in the standard side frame fatigue test. 100,000 cycles is accepted as being equivalent to side frame life.
Referring to Figs. 1 and 2, a portion of the railway truck side frame 2 is shown illustrating particularly one of the pedestal jaw portions 4. The other portion not shown is located on the opposite end of the side frame and is similar in construction.
As can be seen, the pedestal ~aw 4 contains a relatively horizontal roof 6 and vertical sidewalls 8. The view of the side frame jaw : , . .: .
~39S77 portion illustrates the frame as would be viewed rolling down a railroad track. The relatively flat plate 10 is attached to the roof by welding along the side surface of the plate for substantially its entire length. As can be seen, the side portions of the Jaw are open where the plate is attached. The front portion contains vertical, longitudinally extending, peripheral lips 12 on each side between the downstanding sidewalls. The weld 14 is protected between the peripheral lip and the wear plate. If desired, the peripheral lips can be of greater downward vertical extent so as to completely envelop the wear plate. The weldment could extend all the way down to the bottom of the peripheral lip and there would be a smooth finish.
As shown in Fig. 4, the wear plate 24 is in a recessed pocket where the lips 26 form the curved portion and the wear plate 24 forms the flat portion of the AAR Standard pedestal ~aw roof contour. This arrangement provides for additional articulation ~ -between the truck side frame and the roller bearing adapter that is absent when the fIat plate in Fig. 5 is used and provides the same articulation now used on side frames without wear plates. ~ -In Fig. 5, the lips 30 holding the wear plate 32 are tapered at the ends 34 so that the weld attaching the wear plate to the pedestal roof may be conveniently tapered at the ends so as to minimize weld defects and stress raisers in the critical fillets of the pedestal jaw 36. Were these tapers not present, the weld would have to be ended abruptly resulting in a highly stressed area where failures are known to have originated. The tapers may be formed either linear or in the form of a curve, as shown.
Having thus described the invention in detail and with sufficient particularity as to enable those skilled in the art to practice it, what is desired to have protected by Letters Patent is set forth in the following claims.
namely, flllet welding the wear plates to flat horizontal surfaces along the edges of the wear plates and plug welding the plate to the pedestal roof. Later, two additional techniques were tried.
First, a preformed plate, made from spring steel, was simply snapped on the sides of the pedestal roof. Second, a "U" shaped plate was attached by fillet welds between the upstanding legs of the wear plate and the sides of the frame.
Wear plates attached to the horizontal surface of the pedestal roof with fillet welds do not have an alternate mechanical retaining system; i.e., lugs, bosses, to restrain the plate in the event of weld failure, thus allowing loss of the plate when welds fail. It appears probable that due to the limitations of geometric configuration, the welds fail because an insufficient amount of wèld has to be applied.
. The so called plug welded applications also include the design ;
having bosses on the pedestal roof with mating holes in the wear plate. Because of pedestal jaw design as specified by the American Association of Railroads, the design of the prior art wear plates has been limited to a maximum plate thickness of 3/16 inch which limits the strength of the attachment weld. A common specification for such a spring steel plate is 0.109 inch thick AISI 1095 steel, which has a short fatigue life. Anything other than an excellent fit between pedestal roof and wear plate will most likely result in the initiation of a fatigue crack in either the plate or attachment welds.
The "U" plate design would be very difficult to fit to the jaw of the side frame due to manufacturing tolerances inherent in the casting process. The rocking action of the truck side frame on the journal bearing adapter in combination with vertical impact forces will most likely result in attachment weld failures.
~6~3~577 The plate will then be allowed to move relative to the pedestal roof resulting in an ineffective application.
Accordin~ly, it is among the objects of the invention to provide an improved wear plate design for the roof of the pedestal jaw of a railway truck side frame.
In the Drawings. Fig. 1 is an elevation view of one of the pedestal jaws of a truck side frame;
Fig. 2 is a plan view of the same construction;
Fig. 3 is a cross sectional view of a section taken along line 3-3 of Fig. l; and, Figs. 4 and 5 are elevation views showing other embodiments of the invention.
In accordance with the present invention~ there is provided a railway truck side frame having a ~ournal box housing and a pair of pedestal jaws for engaging wheel axles on a railway car. The jaws, two in number, have a roof and downstanding sidewalls. The pedestal roof of the pedestal jaws has vertical, longitudinally extending, peripheral lips on each side thereof between downstanding sidewalls. A relatively flat wear plate is secured to the pedestal roof with a weldment at the side surfaces of the plate. The weld-ment extends substantially the length of the plate and, downwardly, the weldment extends no lower than the vertical peripheral lips.
The above construction was tested and satisfactory performance was exhibited at more than 200,000 cycles in the standard side frame fatigue test. 100,000 cycles is accepted as being equivalent to side frame life.
Referring to Figs. 1 and 2, a portion of the railway truck side frame 2 is shown illustrating particularly one of the pedestal jaw portions 4. The other portion not shown is located on the opposite end of the side frame and is similar in construction.
As can be seen, the pedestal ~aw 4 contains a relatively horizontal roof 6 and vertical sidewalls 8. The view of the side frame jaw : , . .: .
~39S77 portion illustrates the frame as would be viewed rolling down a railroad track. The relatively flat plate 10 is attached to the roof by welding along the side surface of the plate for substantially its entire length. As can be seen, the side portions of the Jaw are open where the plate is attached. The front portion contains vertical, longitudinally extending, peripheral lips 12 on each side between the downstanding sidewalls. The weld 14 is protected between the peripheral lip and the wear plate. If desired, the peripheral lips can be of greater downward vertical extent so as to completely envelop the wear plate. The weldment could extend all the way down to the bottom of the peripheral lip and there would be a smooth finish.
As shown in Fig. 4, the wear plate 24 is in a recessed pocket where the lips 26 form the curved portion and the wear plate 24 forms the flat portion of the AAR Standard pedestal ~aw roof contour. This arrangement provides for additional articulation ~ -between the truck side frame and the roller bearing adapter that is absent when the fIat plate in Fig. 5 is used and provides the same articulation now used on side frames without wear plates. ~ -In Fig. 5, the lips 30 holding the wear plate 32 are tapered at the ends 34 so that the weld attaching the wear plate to the pedestal roof may be conveniently tapered at the ends so as to minimize weld defects and stress raisers in the critical fillets of the pedestal jaw 36. Were these tapers not present, the weld would have to be ended abruptly resulting in a highly stressed area where failures are known to have originated. The tapers may be formed either linear or in the form of a curve, as shown.
Having thus described the invention in detail and with sufficient particularity as to enable those skilled in the art to practice it, what is desired to have protected by Letters Patent is set forth in the following claims.
Claims
1. In a railway truck side frame comprising a journal box and a pair of pedestal Jaws for engaging wheel axles on a railway car, said jaws having a roof and downstanding sidewalls, the improvement comprising the pedestal roof having vertical, longitudinally extending peripheral lips on each side thereof between downstanding sidewalls, a relatively flat wear plate secured to the pedestal roof with a weldment at side surfaces of the plate and extending substantially the length thereof, said weldment extending no lower than the vertical lips.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47555574A | 1974-06-03 | 1974-06-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1039577A true CA1039577A (en) | 1978-10-03 |
Family
ID=23888089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA224,644A Expired CA1039577A (en) | 1974-06-03 | 1975-04-15 | Railway truck pedestal roof wear plate |
Country Status (3)
| Country | Link |
|---|---|
| BR (1) | BR7503458A (en) |
| CA (1) | CA1039577A (en) |
| ZA (1) | ZA752437B (en) |
-
1975
- 1975-04-15 CA CA224,644A patent/CA1039577A/en not_active Expired
- 1975-04-16 ZA ZA00752437A patent/ZA752437B/en unknown
- 1975-06-02 BR BR7504425D patent/BR7503458A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU8033875A (en) | 1976-10-28 |
| ZA752437B (en) | 1976-03-31 |
| BR7503458A (en) | 1976-05-25 |
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