Accession Number : ADA307828

Title :   Cooling Requirements of Ball Bearings Lubricated by Glass-Fiber-Filled Polytetrafluoroethylene Retainers in Cold Hydrogen Gas.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Coe, Harold H. ; Brewe, David B. ; Schibbe, Herbert W.

PDF Url : ADA307828

Report Date : FEB 1970

Pagination or Media Count : 27

Abstract : Experiments were performed with 40-mm-bore ball bearings operating at shaft speeds to 35 000 rpm and thrust loads to 400 lbs (1780 N) in 60 deg R (33 K) hydrogen gas. The minimum coolant flow rate equation developed for bearings equipped with this retainer material was similar to the equation determined in a previous study for bearings with a bronze-filled polytetrafluoroethylene (PTFE) retainer. Retainer wear rate was very low; some inner-race ball-track wear was evident for bearings that had been run for more than 7 hours.

Descriptors :   *COOLING, *HYDROGEN, *GLASS FIBERS, *LUBRICATION, *BALL BEARINGS, *COLD GASES, VELOCITY, POLYMERS, GASES, FLOW RATE, COOLANTS, SHAFTS(MACHINE ELEMENTS).

Subject Categories : Machinery and Tools
      Inorganic Chemistry
      Polymer Chemistry
      Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE