Technical Reports

Prevention of Roller Bearing-Initiated Burnoffs in Railroad Freight Car Journals

  • 29
  • Jan
  • 1979
AUTHOR: Federal Railroad Association
OFFICE: RPD
SUBOFFICE: RPD-30
REPORT NUMBER: DOT/FRA/ORD-78/16
ABSTRACT: The ob j e e t i ve 0 f thi s pro gram was to de t e rmt ne the t ecnmc a i feasibility and cost effectiveness of constructing three separate devices for the prevention of catastrophic roller bearing-initiated, I railroad ;ournal failure. 1. Construction of a low cost axle cap bolt which would replace one of the three bolts in a standard bearing assembly, and which would contain a self-powered, maintenance free transmitter to sistnal a train Crew in the event of roller bearing overtemperature, was proven Fe as i b l r This is technically and economically superior to current wayside temperature sensing devices, and has the capabil i ty of preventing burnoffs associated with bearing failure by any mechanism. 2. The prevention of bearing overlubrication by use of automated ultrasonic test methods was seen to be feasible. Use of such a .lcv ice in a railroad repair track would prevent regreasing a freshly greased bearing and thereby save the costs of setouts and derailments caused by overlubrication. 3. The early detection of bearing component damage (spalling, b r i nell ing, and particulate contamination) by use of "Shock Pulse Analysis' techniques was also seen to be feasible. Use of an automated device in a railroad wheel shop could save t he costs of burnoffs associated with progressive damage, and also of investigative bearing teardown as a result of derailment.

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