Research and Development and Design of a Steerable Transit Truck

Details

• Creators:
  Horwat, J. W.
• Corporate Creators:
  Washington Metropolitan Area Transit Administration ; UTDC Incorporated
• Corporate Contributors:
  United States. Department of Transportation. Urban Mass Transportation Administration
• Subject/TRT Terms:
  Design Development Noise Control Railroad Rails Rapid Transit Cars Research Wear Wheels
• Publication/ Report Number:
  UMTA-DC-06-0362-90-1, TR 443 700 001
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Corporate Publisher:
  United States. Department of Transportation. Urban Mass Transportation Administration
• Abstract:
  This program was initiated as the result of the findings of the WMATA wheel wear/track wear study. Because of the close wheel/track tolerance and flange profile, WMATA noted a wear rate in both wheel and track which was several times higher than anticipated. Because earlier studies of a steerable truck concept had never been completed, WMATA requested UMTA assistance to complete the evaluation. The program objective was to design, analyze and recommend a steerable truck retrofit to the Washington Metro Rockwell trucks. The design features two-point, body-to-axle steering and replacement of the axle bearing rubber sleeve and end cap with an axle bearing box, top mount and laminated rubber/steel sandwiches. Steering input is by lever and push/pull rods. The brake housing-to-side frame mountings are modified to ensure maximum pad/disc contact area. The incorporated design was computer analyzed mathematically for performance with respect to dynamic stability and curving ability. The results of the analyses define a stable vehicle within the dynamic envelope of the WMATA system and flange-free curving ability on curves of radii above 500 feet. Because of the large design change at the side frame/axle interface, a finite element stress analysis was performed resulting in the requirement for a preliminary design side frame reinforcing cap to be welded to the side frame.
• Format:
  PDF
• Funding:
  UMTA-DC-06-0362
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:fa4fbea3ef16932c9ed91ddf7eda8549af28c82496c7e2d2813a35ec0a1189e3b021238bf4bbbea7b08807195a3b867f6561d4b3be782e45b9ecd1367759ddbf
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/89316/dot_89316_DS1.pdf
• File Type:
  [PDF - 20.86 MB ]