[미국특허]
Rail road car truck and bolster therefor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B61D-001/00
B61F-003/00
출원번호
UP-0002222
(2004-12-03)
등록번호
US-7631603
(2009-12-24)
발명자
/ 주소
Forbes, James W.
Hematian, Jamal
Bis, Tomasz
출원인 / 주소
National Steel Car Limited
대리인 / 주소
Hahn Loeser & Parks LLP
인용정보
피인용 횟수 :
24인용 특허 :
159
초록▼
A rail road freight car truck has a truck bolster and a pair of side frames, the truck bolster being mounted transversely relative to the side frames. The mounting interface between the ends of the axles and the sideframe pedestals allows lateral rocking motion of the sideframes in the manner of a s
A rail road freight car truck has a truck bolster and a pair of side frames, the truck bolster being mounted transversely relative to the side frames. The mounting interface between the ends of the axles and the sideframe pedestals allows lateral rocking motion of the sideframes in the manner of a swing motion truck such that the bolster can move laterally relative to the sideframes. The range of travel of the bolster may be greater when the car is fully laded than the car has no lading. This may be achieved by the use of tapered bolster gibs. Friction dampers are mounted to work between the bolster and the sideframes. The friction dampers may be provided with brake linings, or similar features, on the face engaging the sideframe columns, on the slope face, or both. The friction dampers may be mounted in a four-cornered arrangement at each end of the truck bolster. The friction dampers may include members having two rotational degrees of freedom such as may tend to permit the friction elements to accommodate changes in angular orientation between the bolster and the sideframes during pitch and yaw.
대표청구항▼
We claim: 1. A three-piece railroad freight car truck having a bolster sprung between a pair of first and second sideframes, said bolster being sprung on first and second main spring groups carried by said first and second sideframes respectively, each of said main spring groups including coil spri
We claim: 1. A three-piece railroad freight car truck having a bolster sprung between a pair of first and second sideframes, said bolster being sprung on first and second main spring groups carried by said first and second sideframes respectively, each of said main spring groups including coil springs, said truck including friction dampers mounted to work between the bolster and the sideframes, said bolster being mounted to permit limited lateral travel thereof relative to said sideframes, said truck having co-operating members constraining said bolster to a first bounded range of lateral travel relative to said sideframes when loaded under a first magnitude of vertical load, and to a second, different, bounded range of lateral travel relative to said sideframes under a second, different magnitude of vertical load, said co-operating members defining the bounds of said first and second bounded ranges of lateral travel. 2. The railroad freight car truck of claim 1 wherein said second magnitude of vertical load is greater than said first magnitude, and said second range of lateral travel is greater than said first range. 3. The railroad freight car truck of claim 1 wherein said bolster has said first range of travel in a light car condition, and said second range of travel in a fully laden car condition, said second range of travel being greater than said first range of travel. 4. The railroad freight car truck of claim 1 wherein said range of travel varies as a function of vertical loading of said bolster. 5. The rail road freight car truck of claim 1 wherein said range of travel varies linearly as a function of vertical loading of said bolster. 6. The rail road freight car truck of claim 1 wherein said range of travel increases linearly as a function of increasing vertical load on said bolster. 7. The rail road freight car truck of claim 1 wherein said first range permits lateral motion to either side of an at rest position through a maximum amplitude, and said maximum amplitude is in the range of ⅜ to ¾ of an inch. 8. The rail road freight car truck of claim 1 wherein said second range permits lateral motion to either side of an at rest position through a maximum amplitude, and said maximum amplitude is in the range of ⅞ to 1⅜ inches. 9. The rail road car truck of claim 1 wherein said bolster has a first end resiliently mounted to a first of said sideframes and a second end resiliently mounted to a second of said sideframes, and said dampers are mounted in four-cornered groups to act between each of said bolsters ends and said sideframes respectively. 10. The rail road car truck of claim 9 wherein said dampers have non-metallic friction surfaces. 11. The rail road car truck of claim 1 wherein said truck is self-steering. 12. The rail road car truck of claim 1 wherein said truck has sideframe to wheelset interface fittings permitting lateral swinging motion thereof. 13. The rail road car truck of claim 1 wherein said truck has respective four cornered, non-stick-slip groups of said dampers acting between said bolster and each of said sideframes, said truck has sideframe to wheelset interface fittings permitting lateral swinging motion thereof, and said truck is a self-steering truck. 14. The rail road car truck of claim 1 wherein one of said dampers has a damper body and a friction member mounted to said damper body, said friction member being operably mounted to bear against a co-operating wear plate during displacement of said bolster relative to one of said sideframes, and said friction member has a mounting permitting angular displacement of said friction member about at least two axes of rotation relative to said damper body while said friction member remains in engagement with said wear plate. 15. A railroad freight car truck having a bolster sprung between a pair of first and second sideframes, said bolster being sprung on first and second main spring groups carried by said first and second sideframes respectively, each of said main spring groups including an array of coil springs, said truck having friction dampers mounted to work between said bolster and said sideframes, said bolster being mounted to permit lateral travel thereof relative to said sideframes, said truck having co-operating members constraining said bolster within a bounded range of lateral travel, said bounded range having a magnitude, said magnitude being a function of vertical position of said bolster relative to said sideframes. 16. The rail road freight car truck of claim 15 wherein said range of travel is a linear function of vertical displacement of said bolster. 17. The rail road freight car truck of claim 15 wherein said range of lateral travel of said bolster increases with increasing downward vertical displacement of said bolster relative to said sideframes. 18. The rail road car truck of claim 15 wherein said range of lateral travel of said bolster is a linear function of downward displacement of said bolster, wherein said range of lateral travel of said bolster increases in a range of proportion of between 3/16 inches and 5/16 inches of additional lateral travel for every 1 inch of additional downward deflection of said bolster at rest. 19. A three piece rail road car truck having sideframes mounted to a pair of wheelsets, and a bolster extending cross-wise between said sideframes, said bolster having first and second ends each resiliently mounted to a respective one of said sideframes; said bolster having gibs; said sideframes having stops positioned to oppose said gibs; mating pairs of respective ones of said gibs and said stops being co-operatively engageable to limit transverse displacement of said bolster relative to said sideframes; said bolster having a first at rest position relative to said sideframes under a first vertical loading condition, and having a second at rest position relative to said sideframes under a second, different, vertical loading condition; in said first at rest position of said bolster there being a first gap distance between a first bolster gib and its paired stop; and in said second at rest position of said bolster there being a second, different, gap distance between that same first bolster gib and its paired stop. 20. The three piece rail road car truck of claim 19 wherein said sideframes are mounted to said wheelsets at respective sideframe to wheelset interface fittings, and those fittings include rocker members permitting said sideframes to swing laterally. 21. The three piece rail road car truck of claim 19 wherein said truck has a four cornered arrangement of dampers mounted to act between each of said sideframes and a respective one of said ends of said bolster. 22. The three piece rail road car truck of claim 19 wherein said first bolster gib has an abutment surface for mating its paired stop, and said abutment surface is not confined to a vertical plane. 23. The three piece rail road car truck of claim 19 wherein said bolster gib has an abutment surface for mating with its paired stop, said abutment surface being inclined with respect to vertical. 24. The three piece rail road car truck of claim 19 wherein said paired stop of said first bolster gib has an abutment surface for engaging said first bolster gib, and said abutment surface is not confined to a vertical plane. 25. The three piece rail road car truck of claim 19 wherein said paired stop of said first bolster gib has an abutment surface for engaging said first bolster gib, and said abutment surface is inclined with respect to vertical. 26. The three piece rail road car truck of claim 19 wherein said first bolster gib and its paired stop having mating abutment surfaces for limiting lateral travel of said bolster, said mating abutment surfaces being inclined with respect to vertical. 27. The three piece rail road car truck of claim 19 wherein said outboard bolster gib is inclined with respect to vertical. 28. The three piece rail road car truck of claim 19 wherein both said inboard bolster gib and said outboard bolster gib are tapered with respect to vertical.
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Gotlund, Erik L.; Nibouar, F. Andrew; Jeambey, Jon R.; Pike, James A.; Bryant, Jason C.; Stull, Jonathan A.; Kurtzhals, William A., Adapter pad for railcar truck.
Gotlund, Erik L.; Nibouar, F. Andrew; Jeambey, Jon R.; Pike, James A.; Bryant, Jason C.; Stull, Jonathan A.; Kurtzhals, William A., Adapter pad for railcar truck.
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