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  • 1
    facet.materialart.
    Unknown
    Effect of filtration on rolling-element-bearing life in contaminated lubricant environment (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fatigue tests were conducted on groups of 65 millimeter-bore ball bearings under four levels of filtration with and without a contaminated MIL-L-23699 lubricant. The baseline series used noncontaminated oil with 49 micron absolute filtration. In the remaining tests contaminants of the composition found in aircraft engine filters were injected into the filter's supply line at a constant rate of 125 milligrams per bearing-hour. The test filters had absolute particle removal ratings of 3, 30, 49, and 105 microns (0.45, 10, 30, and 70 microns nominal), respectively. Bearings were tested at 15,000 rpm under 4580 newtons radial load. Bearing life and running tract condition generally improved with finer filtration. The 3 and 30 micron filter bearings in a contaminated lubricant had statistically equivalent lives, approaching those from the baseline tests. The experimental lives of 49 micron bearings were approximately half the baseline bearing's lives. Bearings tested with the 105 micron filter experienced wear failures. The degree of surface distress, weight loss, and probable failure mode were found to be dependent on filtration level, with finer filtration being clearly beneficial.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-1272 , E-9418
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Filtration effects on ball bearing life and condition in a contaminated lubricant (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ball bearings were fatigue tested with a noncontaminated lubricant and with a contaminated lubricant under four levels of filtration. The test filters had absolute particle removal ratings of 3, 30, 49, and 105 microns. Aircraft turbine engine contaminants were injected into the filter's supply line at a constant rate of 125 milligrams per bearing hour. Bearing life and running track condition generally improved with finer filtration. The experimental lives of 3 and 30 micron filter bearings were statistically equivalent, approaching those obtained with the noncontaminated lubricant bearings. Compared to these bearings, the lives of the 49 micron bearings were statistically lower. The 105 micron bearings experienced gross wear. The degree of surface distress, weight loss, and probable failure mode were dependent on filtration level, with finer filtration being clearly beneficial.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-78907 , E-9418 , Joint Lubrication Conf.; Oct 24, 1978 - Oct 26, 1978; Minneapolis
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Filtration effects on ball bearing life and condition in a contaminated lubricant (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Ball bearings were fatigue tested with a noncontaminated MIL-L-23699 lubricant and with a contaminated MIL-L-23699 lubricant under four levels of filtration. The test filters had absolute particle removal ratings of 3, 30, 49, and 105 microns. Aircraft turbine engine contaminants were injected into the filter's supply line at a constant rate of 125 milligrams per bearing hour. Bearing life and running track condition generally improved with finer filtration. The experimental lives of 3- and 30-micron filter bearings were statistically equivalent, approaching those obtained with the noncontaminated lubricant bearings. Compared to these bearings, the lives of the 49-micron bearings were statistically lower. The 105-micron bearings experienced gross wear. The degree of surface distress, weight loss, and probable failure mode were dependent on filtration level, with finer filtration being clearly beneficial.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 78-LUB-34 , American Society of Mechanical Engineers and American Society of Lubrication Engineers, Joint Lubrication Conference; Oct 24, 1978 - Oct 26, 1978; Minneapolis, MN
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Effects of ultra-clean and centrifugal filtration on rolling-element bearing life (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Fatigue tests were conducted on groups of 65-mm bore diameter deep-groove ball bearings in a MIL-L-23699 lubricant under two levels of filtration to determine the upper limit in bearing life under the strictest possible lubricant cleanliness conditions. Bearing fatigue lives, surface distress and weight loss were compared to previous bearing fatigue tests in contaminated and noncontaminated oil filters having absolute removal ratings of 3, 30, 49, and 105 microns, with lubricant and sump temperatures maintained at 347 K. Ultra clean lubrication was found to produce bearing fatigue lives that were approximately twice that obtained in previous tests with contaminated oil using 3 micron absolute filtration. It was also observed that the centrifugal oil filter has the same effectiveness as a 30 micron absolute filter in preventing surface damage.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 81-LUB-35 , Joint Lubrication Conference; Oct 05, 1981 - Oct 07, 1981; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Effects of Ultra-Clean and centrifugal filtration on rolling-element bearing life (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Fatigue tests were conducted on groups of 65-millimeter bore diameter deep-groove ball bearings in a MIL-L-23699 lubricant under two levels of filtration. In one test series, the oil cleanliness was maintained at an exceptionally high level (better than a class "000" per NAS 1638) with a 3 micron absolute barrier filter. These tests were intended to determine the "upper limit" in bearing life under the strictest possible lubricant cleanliness conditions. In the tests using a centrifugal oil filter, contaminants of the type found in aircraft engine filters were injected into the filters' supply line at 125 milligrams per bearing-hour. "Ultra-clean" lubrication produced bearing fatigue lives that were approximately twice that obtained in previous tests with contaminated oil using 3 micron absolute filtration and approximately three times that obtained with 49 micron filtration. It was also observed that the centrifugal oil filter had approximately the same effectiveness as a 30 micron absolute filter in preventing bearing surface damage.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-82660 , E-929 , Joint Lubrication Conf.,; Oct 05, 1981 - Oct 07, 1981; New Orleans, LA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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