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  • Other Sources  (25)
  • MECHANICAL ENGINEERING  (25)
  • 1980-1984  (25)
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  • Other Sources  (25)
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  • MECHANICAL ENGINEERING  (25)
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  • 11
    facet.materialart.
    Unknown
    Effect of shot peening on surface fatigue life of carburized and hardened AISI 9310 spur gears (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Surface fatigue tests were conducted on two groups of AISI 9310 spur gears. Both groups were manufactured with standard ground tooth surfaces, with the second group subjected to an additional shot peening process on the gear tooth flanks. The gear pitch diameter was 8.89 cm (3.5 in.). Test conditions were a gear temperature of 350 K (170 F), a maximum Hertz stress of 1.71 billion N/sq m (248,000 psi), and a speed of 10,000 rpm. The shot peened gears exhibited pitting fatigue lives 1.6 times the life of standard gears without shot peening. Residual stress measurements and analysis indicate that the longer fatigue life is the result of the higher compressive stress produced by the shot peening. The life for the shot peened gear was calculated to be 1.5 times that for the plain gear by using the measured residual stress difference for the standard and shot peened gears. The measured residual stress for the shot peened gears was much higher than that for the standard gears.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-2047 , E-936 , NAS 1.60:2047
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
    facet.materialart.
    Unknown
    Optimal tooth numbers for compact standard spur gear sets (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The design of a standard gear mesh is treated with the objective of minimizing the gear size for a given ratio, pinion torque, and allowable tooth strength. Scoring, pitting fatigue, bending fatigue, and the kinematic limits of contact ratio and interference are considered. A design space is defined in terms of the number of teeth on the pinion and the diametral pitch. This space is then combined with the objective function of minimum center distance to obtain an optimal design region. This region defines the number of pinion teeth for the most compact design. The number is a function of the gear ratio only. A design example illustrating this procedure is also given.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 81-DET-115 , American Society of Mechanical Engineers, Design Engineering Technical Conference; Sept. 20-23, 1981; Hartford, CT
    Format: text
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  • 13
    facet.materialart.
    Unknown
    Evaluation of high-contact-ratio spur gears with profile modification (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Scoring tests, surface fatigue tests, and single-tooth bending fatigue tests were conducted with four sets of spur gears of standard design and three sets of spur gears of the new tooth form (NTF) design. Scoring tests were conducted in a gear test rig at a speed of 10,000 rpm using a synthetic polyester C5, C6, C7 substituted pentaerythritol oil. Surface fatigue tests were conducted in the same rig at a speed of 10,000 rpm and Hertz stresses of 173 x 10 to the 7th power and 143 x 10 to the 7th power Pa (250,000 and 214,000 psi). Single tooth bending fatigue tests were conducted on both the standard and NTF gears at an initial load that produced a 10.35 x 10 to the eight power Pa (150,000-psi) bending stress. The gears were load cycled to failure or for 3 x 10 to the 6th power cycles, whichever occurred first. The load was increased after test until failure occurred at 3 x 10 to the 6th power cycles or less. Both the standard and NTF gears scored at a gear bulk temperature of approximately 409 K (277 F). At this temperature the load on the NTF gears was 22 percent less than the load on the standard gears. The scoring failure was a function of gear bulk temperature, where for a given lubricant the temperature is a function of gear design, operating load, and speed.
    Keywords: MECHANICAL ENGINEERING
    Type: Advanced Power Transmission Technol.; p 519-531
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  • 14
    facet.materialart.
    Unknown
    Endurance and failure characteristics of modified Vasco X-2, CBS 600 and AISI 9310 spur gears (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Gear endurance tests and rolling-element fatigue tests were conducted to compare the performance of spur gears made from AISI 9310, CBS 600 and modified Vasco X-2 and to compare the pitting fatigue lives of these three materials. Gears manufactured from CBS 600 exhibited lives longer than those manufactured from AISI 9310. However, rolling-element fatigue tests resulted in statistically equivalent lives. Modified Vasco X-2 exhibited statistically equivalent lives to AISI 9310. CBS 600 and modified Vasco X-2 gears exhibited the potential of tooth fracture occurring at a tooth surface fatigue pit. Case carburization of all gear surfaces for the modified Vasco X-2 gears results in fracture at the tips of the gears.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-81421 , E-344 , Intern. Power Transmission and Gearing Conf.; Aug 18, 1980 - Aug 22, 1980; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 15
    facet.materialart.
    Unknown
    Analytical and experimental spur gear tooth temperature as affected by operating variables (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A gear tooth temperature analysis was performed using a finite element method combined with a calculated heat input, calculated oil jet impingement depth, and estimated heat transfer coefficients. Experimental measurements of gear tooth average surface temperatures and instanteous surface temperatures were made with a fast response infrared radiometric microscope. Increased oil jet pressure had a significant effect on both average and peak surface temperatures at both high load and speeds. Increasing the speed at constant load and increasing the load at constant speed causes a significant rise in average and peak surface temperatures of gear teeth. The oil jet pressure required for adequate cooling at high speed and load conditions must be high enough to get full depth penetration of the teeth. Calculated and experimental results were in good agreement with high oil jet penetration but showed poor agreement with low oil jet penetration depth.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-81419 , E-342 , Intern. Power Transmission and Gearing Conf.; Aug 18, 1980 - Aug 22, 1980; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 16
    facet.materialart.
    Unknown
    NASA transmission research and its probable effects on helicopter transmission design (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Transmissions studied for application to helicopters in addition to the more conventional geared transmissions include hybrid (traction/gear), bearingless planetary, and split torque transmissions. Research is being performed to establish the validity of analysis and computer codes developed to predict the performance, efficiency, life, and reliability of these transmissions. Results of this research should provide the transmission designer with analytical tools to design for minimum weight and noise with maximum life and efficiency. In addition, the advantages and limitations of drive systems as well as the more conventional systems will be defined.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-83389 , E-1601 , NAS 1.15:83389 , AVRADCOM-TR-83-C-3 , Ann. Forum of the Am. Helicopter Soc.; May 09, 1983 - May 11, 1983; St. Louis
    Format: application/pdf
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  • 17
    facet.materialart.
    Unknown
    Into Mesh Lubrication of Spur Gears with Arbitrary Offset Oil Jet. 2: for Jet Velocities Equal to or Greater than Great Velocity (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An analysis was conducted for into mesh oil jet lubrication with an arbitrary offset and inclination angle from the pitch point for the case where the oil jet velocity is equal to or greater than gear pitch line velocity. Equations were developed for minimum and maximum oil jet impingement depth. The analysis also included the minimum oil jet velocity required to impinge on the gear or pinion and the optimum oil jet velocity required to obtain the best lubrication condition of maximum impingement depth and gear cooling. It was shown that the optimum oil jet velocity for best lubrication and cooling is when the oil jet velocity equals the gear pitch line velocity. When the oil jet velocity is slightly greater than the pitch line velocity the loaded side of the driven gear and the unloaded side of the pinion receive the best lubrication and cooling with slightly less impingement depth. As the jet velocity becomes much greater than the pitch line velocity the impingement depth is considerably reduced and may completely miss the pinion.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-83041 , E-1390 , NAS 1.15:83041 , Winter Ann. Meeting of the Am. Soc. of Mech. Engr.; Nov 15, 1982 - Nov 19, 1982; Phoenix, AZ; United States
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    NASA TECHNICAL REPORTS
  • 18
    facet.materialart.
    Unknown
    Into Mesh Lubrication of Spur Gears with Arbitrary Offset Oil Jet. I: For Jet Velocity Less than or Equal to Gear Velocity (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An analysis was conducted for into mesh oil jet lubrication with an arbitrary offset and inclination angle from the pitch point for the case where the oil jet velocity is equal to or less than pitch line velocity. The analysis includes the case for the oil jet offset from the pitch point in the direction of the pinion and where the oil jet is inclined to intersect the common pitch point. Equations were developed for the minimum oil jet velocity required to impinge on the pinion or gear and the optimum oil jet velocity to obtain the maximum impingement depth.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-83040 , E-1389 , NAS 1.15:83040 , Winter Ann. Meeting of the Am. Soc. of Mech. Engr.; Nov 15, 1982 - Nov 19, 1982; Phoenix, AZ; United States
    Format: application/pdf
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  • 19
    facet.materialart.
    Unknown
    Experimental and analytical determination of gear tooth temperatures with oil jet lubrication (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Gear tooth average and instantaneous surface temperatures were measured with a fast response infrared radiometric microscope, while operating at arious speeds, loads and oil jet pressures. Increased oil jet pressure had a significant effect on both average and peak surface temperatures at all test conditions, increasing the speed at constant load and increasing the load at constant speed causes a significant rise in average and peak surface temperatures of gear teeth. A gear tooth temperature analysis was conducted by a finite element method combined with a calculated heat input and oil jet impingment depth with estimated heat transfer coefficients based on the experimental data. It is concluded that oil jet pressures required for adequate cooling at high load and speed conditions must be high enough to get full penetration depth of the teeth.
    Keywords: MECHANICAL ENGINEERING
    Type: AGARD Probl. in Bearings and Lubrication; 14 p|ASME 3rd Intern. Power Transmission and Gearing Conf.; Aug 18, 1980 - Aug 22, 1980; San Francisco
    Format: text
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    NASA TECHNICAL REPORTS
  • 20
    facet.materialart.
    Unknown
    Lubricant jet flow phenomena in spur and helical gears with modified center distances and/or addendums for out-of-mesh conditions (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Out-of-mesh jet lubrication of gears was examined. The pinion impingement cycle was described briefly. An analysis was developed for the lubricant jet flow in the out-of-mesh condition. The analysis provides for the inclusion of modified center distances and modified addendums. Equations were generated for the limit values of variables necessary to remove the severe limitations to facilitate computer analysis. A computer program was designed using these limit formulas to prevent negative impingement (missing) on the pinion.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-83723 , E-2190 , NAS 1.15:83723 , Intern. Power Transmission and Gearing Conf.; Oct 10, 1984 - Oct 12, 1984; Cambridge, MA; United States
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