Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Wear Analysis of Engine Bearings at Constant Shaft Angular Speed during Firing State - Part II: Calculation of the Wear on Journal Bearings

파이어링 상태의 일정 축 각속도에서 엔진베어링의 마모 해석 - Part II: 저어널베어링 마모 계산

  • Chun, Sang Myung (School of Mechanical Engineering, Dept. of Automotive Engineering, Hoseo University)
  • 전상명 (호서대학교 기계공학부 자동차공학전공)
  • Received : 2018.05.02
  • Accepted : 2018.07.01
  • Published : 2018.08.31
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Abstract

This paper presents a wear analysis procedure for calculating the wear of journal bearings of a four-strokes and four-cylinder engine operating at a constant angular crank shaft speed during firing conditions. To decide whether the lubrication state of a journal bearing is in the possible region of wear scar, we utilize the concept of the centerline average surface roughness to define the most oil film thickness scarring wear (MOFTSW) on two rough surfaces. The wear volume is calculated from the wear depth and wear angle, determined by the magnitude of each film thickness on a set of oil films with thicknesses lower than the MOFTSW at every crank angle. To calculate the wear volume at one contact, the wear range ratio during one cycle is used. The total wear volume is then determined by accumulating the wear volume at every contact. The fractional film defect coefficient, asperity load sharing factor, and modified specific wear rate for the application of the mixed-elasto-hydrodynamic lubrication regime are used. The results of this study show that wear occurs only at the connecting-rod big-end bearing. Thus, simulation results of only the big-end bearing are illustrated and analyzed. It is shown that the wear volume of each wear scar group occurs consecutively as the crank angle changes, resulting in the total accumulated wear volume.

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References

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