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  • MACHINE ELEMENTS AND PROCESSES  (18)
  • 1970-1974  (18)
Collection
Keywords
Years
Year
  • 11
    facet.materialart.
    Unknown
    A life study of AISI M-50 and Super Nitralloy spur gears with and without tip relief (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-38 , Joint Lubrication Conference; Oct 15, 1973 - Oct 18, 1973; Atlanta, GA; US
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 12
    facet.materialart.
    Unknown
    The application of elastohydrodynamic lubrication in gear tooth contacts. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is shown that in the early stages of design, scoring and fatigue failure of gear contact surfaces can be prevented by the following means: improving load capacity with the aid of tip relief, or by improved surface finish; by giving special care to the location and application of the lubricant in high-speed or high-load gear applications; by determining the thickness of the elastohydrodynamic film from an analysis for the worst temperature, speed, and load conditions, and selecting the appropriate lubricant from this analysis; by using an additive in the case of frequent repeated startup and shutdown conditions; by taking the expected temperature, speed, and load in the selection of an extreme pressure additive; and by systematically testing any new transmission or gear box design.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: International Lubrication Conference; Oct 09, 1972 - Oct 12, 1972; New York, NY; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
    facet.materialart.
    Unknown
    Study of ball bearing torque under elastohydrodynamic lubrication (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Spinning and rolling torques were measured in an angular-contact ball bearing with and without a cage under several lubrication regimes in a modified NASA spinning torque apparatus. Two lubricants were used, a di-2 ethylhexyl sebacate and a synthetic paraffinic oil, at shaft speeds of 1000, 2000, and 3000 rpm and bearing loads from 10 lbs to 90 lbs. An analytical model was developed from previous spinning friction models to include rolling with spinning under lubrication regimes from thin film to flooded conditions. The bearing torque values have a wide variation, under any condition of speed and load, depending on the amount of lubricant present in the bearing. The analytical model compared favorably with experimental results under several lubrication regimes.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68271 , E-7284 , Joint Lubrication Conf.; Oct 16, 1973 - Oct 18, 1973; Atlanta, GA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 14
    facet.materialart.
    Unknown
    The application of elastohydrodynamic lubrication in gear tooth contacts (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An analytical method is presented for determining elastohydrodynamic film thickness in gears from theory and how the film affects gear failure and life. The practical aspects of gear lubrication are presented, including mechanical and service variables which must be considered to obtain optimum gear performance under severe operating conditions.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68142 , E-7146 , Intern. Lubrication Conf.; Oct 09, 1972 - Oct 13, 1972; New York
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 15
    facet.materialart.
    Unknown
    Gear materials for high-production light-deputy service (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The selection of a material for high volume, low cost gears requires careful consideration of all the requirements and the processes used to manufacture the gears. The wrong choice in material selection could very well mean the difference between success and failure. A summary of the cost that might be expected for different materials and processes is presented; it can be seen that the cost can span nearly three order of magnitudes from the molded plastic gear to the machined gear with stamped and powder metal gears falling in between these extremes.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-71446 , E-7684 , Power Transmission Design Show; Oct 09, 1973 - Oct 10, 1973; Chicago, IL; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 16
    facet.materialart.
    Unknown
    Design analysis for a nutating plate drive 4 (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A simplified design analysis was conducted on a nutating plate type drive system for a 2500 horsepower helicopter main rotor gear box. A drive system that split the output torque evenly between two nutating plates for the purpose of reducing the load on each nutating plate was analyzed. Needle bearings were used on the nutating plate pins. The results of the analysis indicate that the required load capacity of the pin bearings and the speed of the nutating plate bearings were beyond the state-of-the-art capacity of rolling-element bearings. The analysis further indicates that the nutating plate drive is less efficient, and results in a higher weight per horsepower than a conventional planetary helicopter transmission with similar design specifications.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68117 , E-7050 , Mech. Conf. and Intern. Symp. on Gearing and transmissions; Oct 08, 1972 - Oct 12, 1972; San Francisco
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 17
    facet.materialart.
    Unknown
    Study of ball bearing torque under elastohydrodynamic lubrication (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Spinning and rolling torques were measured in an angular-contact ball bearing with and without a cage under several lubrication regimes in a modified NASA spinning torque apparatus. Two lubricants were used - a di-2 ethylhexyl sebacate and a synthetic paraffinic oil, at shaft speeds of 1000, 2000, and 3000 rpm and bearing loads from 45 newtons (10 lb) to 403 newtons (90 lb). An analytical model was developed from previous spinning friction models to include rolling with spinning under lubrication regimes from thin film to flooded conditions. The bearing torque values have a wide variation, under any condition of speed and load, depending on the amount of lubricant present in the bearing. The analytical model compared favorably with experimental results under several lubrication regimes.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-39 , Joint Lubrication Conference; Oct 15, 1973 - Oct 18, 1973; Atlanta, GA; US
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 18
    facet.materialart.
    Unknown
    Lubrication considerations in gear design (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Lubrication considerations concerning mechanical and service variables for obtaining optimum gear performance under severe operating conditions
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: GEAR SEMINAR ON OPERATION UPDATE; Dec 10, 1970; CLEVELAND, OH
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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