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  • 1
    facet.materialart.
    Unknown
    OH-58 helicopter transmission failure analysis (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The OH-58 main transmission gearbox was run at varying output torques, speeds, and oil cooling rates. The gearbox was subsequently run to destruction by draining the oil from the gearbox while operating at a speed of 6200 revs per minute and 36,000 inch-pounds output torque. Primary cause of gearbox failure was overheating and melting of the planet bearing aluminum cages. Complete failure of the gearbox occurred in 28 1/2 minutes after the oil pressure dropped to zero. The alternating and maximum stresses in the gearbox top case were approximately 10 percent of the endurance limit for the material. Deflection of the bevel gear at 67000 inch-pounds output torque indicate a marginal stiffness for the bevel gear supporting system.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-X-71867 , E-8633
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Liquid cryogenic lubricant (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fluorinated polyethers are suitable lubricants for rolling-element bearings in cryogenic systems. Lubrication effectiveness is comparable to that of super-refined mineral oil lubricants operating at room temperature.
    Keywords: MACHINERY
    Type: LEW-11075
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of Lubricant Jet Flow (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Computer program, IMPOUT 2, developed using newly-established "limit formulas" to prevent lubricant non-impingement on pinion. Program used to analyze impingement depth on gear teeth for oil jet located at out-of-mesh position with arbitrary offset and inclination angles and with arbitrary addendum and center-distance modification. IMPOUT 2 program written in ANSI FORTRAN IV for use on CDC 750.
    Keywords: MACHINERY
    Type: LEW-14242 , NASA Tech Briefs (ISSN 0145-319X); 10; 2; P. 104
    Format: text
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    NASA TECHNICAL REPORTS
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