DTE Seminar Constant Contact Side Bearings Paul Aspengren.
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Transcript of DTE Seminar Constant Contact Side Bearings Paul Aspengren.
![Page 1: DTE Seminar Constant Contact Side Bearings Paul Aspengren.](https://reader033.fdocuments.in/reader033/viewer/2022051316/56649cb55503460f94979090/html5/thumbnails/1.jpg)
DTE Seminar
Constant Contact Side Bearings
Paul Aspengren
![Page 2: DTE Seminar Constant Contact Side Bearings Paul Aspengren.](https://reader033.fdocuments.in/reader033/viewer/2022051316/56649cb55503460f94979090/html5/thumbnails/2.jpg)
Key Terms and Concepts• Constant Contact Side Bearing – CCSB• Preload• Setup height• Gap• Hunting• Long Travel• L/V Ratio
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Railcar
Railcar Truck
Introduction
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Roller
Non Constant ContactNon Constant Contact
Side Bearing Types
Block
Constant ContactConstant Contact
Metal Cap
Non Metal Cap
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Linear CageLinear Cage Telescoping CylindersTelescoping Cylinders
Side Bearing Types
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Truck Bolster
Car Body Wear Plate
Preload
Setup HeightTravel
Basic Terminology
Constant Contact
•Standard
•5/16”
•Long
•5/8”
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• Setup Height is the distance between the wear plate and bolster pad
• Rule 62 has condemning limits for different models• Important to measure on empty cars on reasonably
level track• Shims added or removed to adjust setup height
Setup Height
![Page 8: DTE Seminar Constant Contact Side Bearings Paul Aspengren.](https://reader033.fdocuments.in/reader033/viewer/2022051316/56649cb55503460f94979090/html5/thumbnails/8.jpg)
Long Travel
Roller Assist
Standard Travel
Side Bearing Types
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Functions of a Side Bearing
• Improve curve negotiation
• Help in controlling car body roll
• Increase hunting threshold
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•Long Travel (LT) equalizes vertical wheel loads entering and exiting curves.
V V
Curve Negotiation
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Pad absorbs energy on each
compression
Area within curve is equal to
absorbed energy
Helps to dampen car body roll
Vertical Hysterisis
TCC-III-60 Enhanced
0
1
2
3
4
5
6
7
8
9
10
4.44.64.855.25.45.65.866.2
Set-Up Height (in)
Load
(kip
s)
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• At higher speeds, the steering forces will cause the wheel set to over compensate and diverge from equilibrium.
What is Hunting?
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What Is Hunting?
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Hunting Control
-150%
-100%
-50%
0%
50%
100%
150%
-0.3 -0.2 -0.1 0 0.1 0.2 0.3
Displacement
Sh
ea
r F
orc
e
84%
-150%
-100%
-50%
0%
50%
100%
150%
-0.3 -0.2 -0.1 0 0.1 0.2 0.3
Displacement
Sh
ear
Fo
rce
46%
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Side Frame - Pedestal Roof
Side Frame - Adapter LugsBolster- Inner Column
Gibs
Side Frame -
Anti Rotation Lugs
Bolster - Column Gibs
Bolster - Shoe Pocket
Why Hunting Control is Important to Car Owners – Reduces Excessive Wear!
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AAR Circular C-9560 on December 10, 2002
Rule 88.C.3.(18)(m) – Truck Components All units must be equipped with …….
Long-travel Constant-Contact Side Bearings …… conforming to AAR Specification M-948.
Effective December 31, 2002.
(1) New Cars(2) Rebuilt Cars (3) Extended Service Status Cars(4) Increased Gross Rail Load Cars
Long Travel Mandate for New Cars
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AAR Circular C-10068 on March 24, 2005
Rule 88.A.15.f – Tank Cars
The approved revision to the rule becomes effective on April 1, 2005.
AAR Circular C-10271 on February 9, 2006
Rule 90.B.5.i – Flat Cars
The approved revision to the rule becomes effective on April 1, 2006 as was suggested in c-10250.
Recent Long Travel Mandates
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AAR Side Bearing Mandate• TTCI Side Bearing Testing
- Comprehensive CCSB and Car Type Matrix
• Rule 62 - New Side Bearing Maintenance and Billing Requirement
• M-948 - Side Bearing Specification Rewrite
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AAR Field Manual Rule 62
• Wear limits
• Setup height criteria
• Correct repair practices
• General information
• Billing and Job codes
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• Incorrect fasteners can lead to broken housings
Yard Inspection
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Setup Height Issues
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•Rule 62 has replacement criteria
•Pocket Guides have free height criteria
Pad Condition
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Wrap Up• Intro to side bearings
• Function of side bearings
• Rules governing side bearings
• Common failures related to side bearings
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Questions?