lets talk about brake beams! miner series 2000 diagonally corrected beam
TRANSCRIPT
Let’s Talk About Brake Beams!Miner Series 2000 Diagonally Corrected Beam
Topics for Today….
• What is a Brake Beam and What Does It Do…
• Brake Beam Terminology
• Different Beam Design and Construction
• Potential Application Issues
• AAR Wear Limits and Reasons for Replacement of Brake Beams
Brake beam is the structure that holds the brake shoes and forces them against the wheels
Railcar Truck – Brake Beam Movement Body mounted Brake systems
Wabtec Truck TMX mounted brake system
Wabtec UBX Truck mounted brake system
NYAB TMB–60 Truck mounted brake system
• Anatomy of SERIES 2000 Beam
SCT Brake Beam
Stucki Brake Beam
Brake Beam TerminologyBrake Head
Camber
Hucks
Reversible Strut
Compression MemberBrake Head Extension
Brake Lever Slot
Tension Member
Brake Beam Ratings
• #18 and #24 Rating for Brake Beams
• #18 = Rated for 18,000 lbs force
• #24 = Rated for 24,000 lbs force
• Rating dependent on Railcar type and demands of service
• Wheel – Brake Beam – Brake Shoe Interface
• Normal Condition for a Diagonally Corrected Brake Beam
What Does Diagonally Corrected Mean?
• Uncorrected beam tends to ‘sag’ or droop over time
Uneven Brake Shoe Wear
Diagonal Correction
Corrected Conventional
Or Uncorrected
Shoe Wear – From Non Corrected Beams
Proper Brake Shoe Wear is Determined by:
• Appropriate Wheel Size
• Side Frame Pocket Angle
• Side Frame Pocket Opening
• Beam Design
Simply Stated!
Miner Brake Beam Head
#24 Beam
3 Hucks
- Mechanically Fastened
Different Brake Head Designs
2 rivets attaching head
Another Brake Head Design
40” of weld per headForged brake head
extensions
Welded construction
Miner Strut Design
Hardened Steel Bushing
Different Strut Design
Another Strut Design
Brake Shoe
Key Application
•Proper Brake Shoe Key Installation is critical to Safe and Efficient Braking and Maximum Shoe Life
Miner Series 2000 Brake Beam HeadBrake shoe key - Installed and Locked
Key LockKey Guide
Another Brake Beam HeadIncorrect Installation on Brake Shoe Key - Behind Shoe
Another Brake Beam Head
Installed Key
Another Brake Beam Head
Incorrect Key Installation
Reasons for Bad Order or Beam Replacement
•From 2008 AAR Field Manual Interchange Rules – Rule 6 Brake Beams
•Covers Wear Limits and Causes for Renewal
Condemnable Factors – Reasons for Replacement of Brake Beams
• Damaged or worn tension or compression members – worn or cut to ½ original thickness; cut or notch exceeding ½ inch in depth
• Twisted beam or brake beam head• Worn end extensions – Replace if less than 1-1/4 inch• Worn brake beam wear liner – if ½ original thickness• Loose brake beam head – can be moved more than ½ inch• Strut bent or twisted – Strut pin hole elongated or worn more than 3/16” or
more or strut bushings worn through; lever slot worn 1/8” or more• One or more of brake head corners broken or worn – will not properly contact,
support and position brake shoe• Parts of complete brake beam missing• Cracks anywhere in the brake beam – single crack in wear plates attached to
end extensions is not condemnable unless damaging wear liner• Wrong beam for railcar design or brake system
Defective Brake Beam Indicators
• If any of the following indicators are identified investigate further• If possible do a roll by (listen for brake beam chatter, pounding or
signs of high vibration)• During inspection look for brake shoes that are cocked or out of
position or place• Bottom half of brake shoe is missing (can cause bottom of brake head
to twist inward)• Burned in shoes (check handbrake)• Shiny areas on compression, tension and strut area• Rust signs inside and outside of box type brake beams• Look for strut clamps, rivets or bolts missing• Causes for a closer look are shell spots, built up tread or slid flat
wheels
Missing Parts, Damaged Heads or Out of Position Beams
Broken Welds, Broken Members or Loose or Dislodged Clamps
In Summary
• Beam Terminology
• Different Beam Design and Construction
• Potential Application Issues
• AAR Wear Limits and Reasons for Replacement of Brake Beams
Questions…?
Brake Beams
Draft Gears
Side bearings
Discharge Gates and Custom Unloading Devices