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  • Mechanical Engineering  (3)
  • MATERIALS  (2)
  • MATERIALS, NONMETALLIC  (2)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
  • 1
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    Determination of Principal Curvatures and Contact Ellipse for Profile Crowned Helical Gears (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Helical gears with localized bearing contact of tooth surfaces achieved by profile crowning of tooth surfaces are considered. Profile crowning is provided by application of two imaginary rack-cutters with mismatched surfaces. The goal is to determine the dimensions and orientation of the instantaneous contact ellipse that requires the determination of principle curvatures of pinion-gear tooth surfaces. A simplified solution to this problem is proposed based on the approach development for correlation of principal curvatures and directions of generating and generated tooth surfaces. The obtained equations are applied for profile crowning where the normal profiles of the rack-cutters are either a circular arc or a straight line.
    Keywords: Mechanical Engineering
    Type: Journal of Mechanical Design; Volume 121; 107-111
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Computerized Simulation of Meshing of Conventional Helical Involute Gears and Modification of Geometry (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approach is proposed for computerized simulation of meshing of aligned and misaligned involute helical gears. Algorithms for TCA (Tooth Contact Analysis) computer programs were developed. Influence of misalignment on the shift of the bearing contact and transmission errors has been investigated. Numerical examples that illustrate the developed theory are provided.
    Keywords: Mechanical Engineering
    Type: NASA-TM-107451 , E-10732 , NAS 1.15:107451 , ARL-TR-1370
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of five lubricants on life of AISI 9310 spur gears (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Spur-gear surface fatigue tests were conducted with five lubricants using a single lot of consumable-electrode vacuum melted (CVM) AISI 9310 spur gears. The lot of gears was divided into five groups, each of which was tested with a different lubricant. The test lubricants are classified as either a synthetic hydrocarbon, mineral oil, or ester-based lubricant. All five lubricants have imilar viscosity and pressure-viscosity coefficients. A pentaerythritol base stock without sufficient antiwear additives produced a surface fatigue life pproximately 22 percent that of the same base stock with chlorine and phosphorus type additives. The presence of sulfur type antiwear additives in the lubricant did not appear to affect the surface fatigue life of the gears tested. No statistical difference in the 10-percent surface fatigue life was produced with four of the five lubricants.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TP-2419 , E-2183 , NAS 1.60:2419
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Lubricant selection for gear designers (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Guide for gear designers, consisting of theory, calculations, charts, curves and references, explains lubrication requirements for gears to insure maximum performance. Mechanical and service variables are considered in order to obtain optimum gear performance under severe operating conditions.
    Keywords: MATERIALS
    Type: LEW-11483
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Lubricants and Additives Affect Spur-Gear Fatigue (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Surface-fatigue tests conducted with AISI 9310 steel spur gears show surface-fatigue life of AISI 9310 steel spur gears increased as much as 400 percent by addition of small amount of phosphorus-type extreme-pressure (EP) additive in lubricant. Antiwear or EP additives either absorbed onto surface or react with surface to form protective coating or surface film. Boundary film provides barrier that prevents contact of metal surfaces and provides low shear strength, which reduces friction coefficient below base metal.
    Keywords: MATERIALS
    Type: LEW-14314 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 84
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Rolling-element fatigue and lubrication with fluorinated polyethers at cryogenic temperatures (1970)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Rolling-element fatigue and lubrication with fluorinated polyethers at cryogenic temperatures
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TM-X-52863 , LUBRICATION CONF.; Oct 13, 1970 - Oct 15, 1970; CINCINNATI
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Rolling-element fatigue and lubrication with fluorinated polyethers at cryogenic temperatures (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Rolling ball fatigue and lubrication with fluorinated polyethers at cryogenic temperatures compared to superfined mineral oil
    Keywords: MATERIALS, NONMETALLIC
    Type: LUBRICATION CONFERENCE; Oct 12, 1970 - Oct 15, 1970; CINCINNATI, OH; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Vibration Signature Analysis of a Faulted Gear Transmission System (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-08-16
    Description: A comprehensive procedure in predicting faults in gear transmission systems under normal operating conditions is presented. Experimental data were obtained from a spiral bevel gear fatigue test rig at NASA/Lewis. Time-synchronous-averaged vibration data were recorded throughout the test as the fault progressed from a small single pit to severe pitting over several teeth, and finally tooth fracture. A numerical procedure based on the Wigner-Ville distribution was used to examine the time-averaged vibration data. Results from the Wigner-Ville procedure are compared to results from a variety of signal analysis techniques that include time-domain analysis methods and frequency analysis methods. Using photographs of the gear tooth at various stages of damage, the limitations and accuracy of the various techniques are compared and discussed. Conclusions are drawn from the comparison of the different approaches as well as the applicability of the Wigner-Ville method in predicting gear faults.
    Keywords: Mechanical Engineering
    Type: AIAA Paper 94-2937 , E-8914-1 , Journal of Propulsion and Power (ISSN 0748-4658); 12; 2; 289-295
    Format: text
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