DOI QR코드

DOI QR Code

엔진 내구시험 시 실린더 보아의 마모에 관한 연구

A Study on Cylinder Bore Wear during Engine Durability Test

  • 전상명 (호서대학교 자동차공학과)
  • 발행 : 2006.06.01

초록

Cylinder bore wear may not be a problem in most current automotive engines. However, a small change in cylinder bore diameter can significantly affect the lubrication characteristics and ring axial motion. This in turn can cause to change inter-ring pressure, blow-by and oil consumption in an engine. Therefore, by predicting the wear of piston ring face, ring groove and cylinder bore altogether, the changed ring end gap and the changed volume of gas reservoir can be calculated. Then the excessive oil consumption can be predicted. Being based on the calculation of gas flow amount by the theory of piston ring dynamics and gas flow, and the calculation of oil film thickness and friction force by the analysis of piston ring lubrication, the calculation theory of oil amount through top ring gap into combustion chamber will be set. This is estimated as engine oil consumption. Furthermore, the wear theories of ring, groove and cylinder bore are included. Then the each amount of wear is to be obtained. The changed oil consumption caused by the new end gap and the new volume of oil reservoir around second land, can be calculated at some engine running interval. Meanwhile, the wear amount and oil consumption occurred during engine durability cycle are compared with the calculated values. Next, the calculated amount of oil consumption and wear are compared with the guideline of each pare0s wear and oil consumption. So, the timing of part repair and engine life cycle can be predicted in advance without performing engine durability test. The wear data of cylinder bore diameter are obtained from three engines before and after engine durability test. The calculated wear data of cylinder bore diameter are turn out to be twice of the lower bound of averaged test values at TDC and the lower bound at BDC.

키워드

참고문헌

  1. Rabinowicz, E., Friction and Wear of Materials, Wiley, 1965
  2. Stowers, I. F. and Rabinowicz, E., 'The Mechanism of Fretting Wear,' ASME paper 72-Lub-20, 1972
  3. Ting, L. L. and Mayer, J. E., Jr., 'Piston Ring Lubrication and Cylinder Bore Wear Analyses, Part I-Theory,' J. Lubr. Technol., 96F, p. 305, 1974
  4. Ting, L. L. and Mayer, J. E., Jr., 'Piston Ring Lubrication and Cylinder Bore Wear Analyses, Part II-Theory Verification,' J. Lubr. Technol., 96F, p. 258, 1974
  5. Ting, L. L., Lubricated Piston Rings and Cylinder Wear, Wear Control Hand Book, edited by M. B. Peterson and W. O. Winer, ASME, New York, N. Y. pp. 609-665, 1980
  6. Murray, E. J., 'Tribology-Pistons and All That...Part Two,' Hepolite Bulletine, Vol. 23, No.2, p. 8, 1968
  7. Murray, E. J., 'Cylinder Liner Design, Part I: Wear and Its Causes,' Automobile Engineer, p. 373, 1953
  8. Dorsch, H. and Wacker, E., 'ALUSIL-Zylinder und FERROCOAT-Kolben fur den Porsche-Motor 911,' MTZ Motor Zeit., Vol. 35, No.2, p. 33, 1974
  9. Neale, M. J., 'The Problems of Piston Ring and Cylinder Scuffing in Internal Combustion Engines,' Ministry of Technology, BR 21433, Crown Copyright, 1970
  10. Ainsleym, N. G. and Cleveland, A. E., 'CLR Oil Test Engine,' SAE Golden Anniversary Fuels and Lubricants Meeting, Philadelphia, 1955
  11. Sreenathm, A. V. and Venkatesh, S., 'Experimental Studies on the Wear of Engine Components,' Wear, Vol. 16, p. 245, 1970 https://doi.org/10.1016/0043-1648(70)90248-6
  12. Lees, H. D., 'Statistics on Cylinder Wear in Marine Diesel Engines,' Wear, Vol. 2, p. 273, 1958/59 https://doi.org/10.1016/0043-1648(59)90266-2
  13. Coant, P. N., et al., 'Lubrication and Wear Monitoring of High-Performance Marine Diesel Cylinder Oil,' Lubrication Engineering, p. 581, 1977
  14. Chun, S. M., 'A Basic Study on Piston-Ring Pack,' Journal of the KSTLE, Vol. 21, No.2, pp. 83-92, 2005
  15. Chun, S. M., 'A Study on Engine Oil Consumption,' Journal of the KSTLE, Vol. 21, No. 6, pp. 296-301, 2005