FIRST PROGRESS REPORT LATERAL ACTION OF COMMON DESIGNS OF FREIGHT CAR TRUCKS HAVING AXLES WITH AND WITHOUT END COLLARS

The objective of certain instrumentation in the tests was to obtain fundamental information on the lateral action of different common designs of freight car trucks having standard and modified parts in the journal box assemblies, and having axles with and without end collars. It was desired to determine the motions of truck parts, and relation between these motions and lateral car body accelerations, and the origins of lateral disturbances to the car body, relative importance of these origins, and manner of transmission of these disturbances from the rail through the truck to the car body. A mechanical recorder was attached to one truck to obtain records of the relative lateral movements of truck parts (axle, bearing, wedge, frame) at both ends of one axle, and records of the vertical and lateral displacements of both side frames relative to the bolster. The conclusions are as follows: The most important origin of lateral disturbance to the car body is the nosing of the wheel-axle assemblies and truck, due to coning of the wheel treads. The effects of axle end collars on truck action are to increase the activity of truck parts but to limit the forces transmitted through the truck. Increase of lateral clearance, which does not reduce the beneficial effects of axle end collars, should improve the lateral riding quality of conventional trucks with snubbers. Curved track produces a quieting influence on truck action and improves lateral riding quality. Definite improvement in lateral riding quality should result from the use of a device which would cause the car body to seek a centered position between lateral clearances.

• Supplemental Notes:
  • Progress Report.
• Corporate Authors:

  Association of American Railroads

  50 F Street, NW
  Washington, DC  United States  20001-1564
• Publication Date: 1950-12-28

Media Info

• Pagination: 51 p.

Subject/Index Terms

• TRT Terms: Axles; Bearings; Bolsters; Curved track; Defects; Hunting (Dynamics); Motor vehicle bodies; Rail joints; Railroad cars; Railroad tracks; Ride quality; Rocking; Technology; Trucks; Vehicle design; Vehicle dynamics
• Uncontrolled Terms: Lateral dynamics
• Geographic Terms: United States
• Old TRIS Terms: Car body; Car rocking; Track irregularities
• Subject Areas: Design; Motor Carriers; Railroads;

Filing Info

• Accession Number: 00033736
• Record Type: Publication
• Report/Paper Numbers: F4000
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM