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[論文] 엔진CON-ROD베어링 耐 SCUFFING性 向上에 관한 硏究
최재권(J.K.Choi),이정현(J.H.Lee) 한국자동차공학회 1992 오토저널 Vol.14 No.2
Crank pin temperatures were measured and analyzed to find out practical method which can predict the engine bearing reliability. The measuring points were determined to be near the MOFT region and far from that by theoretical calculation. The effect of engine running condition, oil temperature, the change of oil circuit into bearing and crankshaft endplay on crank pin temperature were experimentally tested. The result obtained was as following. The crank pin temperature was dependent on oil film thickness and directly influenced by the change of test condition. Also the length of the crankshaft endplay was confirmed to be critical to connecting rod bearing failure.<br/> In conclusion, we found that the measurement method of crank pin temperature can be used for predicting the engine bearing reliability.
피스톤링의 회전운동이 오일소모에 미치는 영향 -제1보 : 피스톤링의 회전운동 측정-
김중수(J.S.Kim),민병순(B.S.Min),오대윤(D.Y.Oh),최재권(J.K.Choi),진준하(J.H.Jin) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The rotational movements of piston rings were measured by a radiotracer technique in a single cylinder engine. In order to measure the rotation of the top and 2'nd ring simultaneously, two kinds of isotopes, ^60Co and ^192Ir, were used and mounted in each rings. 3 NaI γ -ray detectors were used to measure y -ray intensities. While motoring the assembled engine, the y -ray intensities were measured with the ring gap fixed at a certain angle, and as a result of repeating this procedure, the relationship between the gap angle and y -ray intensities was calculated. Based on this calibration results, algorithm was made to determine the gap angle from the measured y -ray intensities and the uncertainties was below 8° . As results of the experiment, it was known that the movement of each ring isn't dependent on the other ring and also isn't regular at same operating condition. The rotational speed was within the range of 0.2~0.4 rev/min. Even though the movement patterns were arbitrary at the same condition, the tendency was found that the ring can rotate easily at low load condition.<br/>
알루미늄 합금 실린더 블럭을 적용한 가솔린 엔진의 냉각계 개발
한덕주(D. J. Han),민병순(B. S. Min),신승용(S. Y. Shin),최재권(J. K. Choi) 한국자동차공학회 1995 한국자동차공학회 학술강연초록집 Vol.- No.-
본 연구는 알루미늄 블럭을 장착한 실 엔진 내구 시험시, 주철 블럭에서는 발생하지 않았던 열해에 의한 피스톤 톱랜드 손상 원일을 밝히고, 대책을 세우는데 그 목적이 있다. 대상에서 주철 블럭과 알루미늄 블럭을 장착한 엔진의 피스톤 온도와 블럭 각 부위의 열유속 및 열정산을 측정, 비교하여 아래와 같은 사실들을 밝혀 내었다. 알루미늄 블럭 엔진에서의 피스톤 손상은 알루미늄 블럭의 주조 블량에 의하여 피스톤이 고온이 되었기 때문에 발생하였다. 알루미늄 블럭에서 실린더 라이너의 주조 상태 개선없이 피스톤 손상을 방지하기 위하여 피스톤 오일젯과 오일 쿨러 장착 그리고 오일 펌프의 용량 증대가 필수적이다.