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최재권(J. K. Choi),이상원(S. W. Lee),민병순(B. S. Min),조영우(Y. W. Cho) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.1
The effects of the piston 2nd land volume and the hole from 2nd land to undercrown were investigated. Oil film thickness, ring motion and 2nd land pressure were analyzed to accomplish that. The oil film thickness between ring and liner was measured by capacitant technique to verify the calculated results. The increase of 2nd land volume reduces oil consumption. It is because of the change of oil film thickness rather than ring motion and blow-up gas rate. The difference of oil film thickness between intake-stroke and compression-stroke is proportional to oil consumption. The left behind oil during expansion-stroke is also proportional to it. The 2nd land hole was expected to reduce oil consumption because it decreases the 2nd land pressure and stabilized the axial motion of top ring. However, a counter result was obtained at the actual test, so it was found out that the effect of blow-down is significant as well as that of oil film thickness.
[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.
피스톤핀 옵셋이 피스톤운동과 운동에너지 손실에 미치는 영향에 관한 연구
한덕주(D. J. Han),최재권(J. K. Choi) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.3
A theoretical analysis of predicting the detailed motion of a piston-crank mechanism within piston-guide clearance is presented, and the analysis is applied to the piston motion in a gasoline engine. A piston movement program is developed to calculate the piston attitude relative to the bore, the piston to bore impact velocity and kinetic energy loss and the net transverse force acting on the piston. This paper presents the formulation of a set of differential equations governing the transverse and rotational motion of a piston. These equations of motion were solved by well established Runge-Kutta method. As a result of this study, it is possible to predict the effects of piston geometry and piston pin offset on a piston motion and kinetic energy loss.
엔진 내 냉각수 유동형태가 연소실 벽면온도에 미치는 영향에 관한 연구
민병순(B. S. Min),최재권(J. K. Choi) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.1
The effect of coolant flow pattern on the metal temperature of the combustion chamber was studied in 1.5L and 1.8L gasoline engines. One of the main important points in the design of the water jacket is the increase of the coolant flow velocity.<br/> In this paper, the water jackets of the cylinder head and the cylinder block were visualized for the purpose of improving the coolant flow pattern. By the use of this technique, the optimal design of the size and the location of the water transfer hole was possible. And, to lower the metal temperatures of the thermally critical parts, the drilled water passages were employed.<br/> To investigate the effect of the improved flow pattern and the drilled water passages, the metal temperatures of the combustion chamber were measured. As a result of the temperature measurement, it was found out that both the change of flow pattern and the drilled water passages have significant effect on the reduction of the peak metal temperature.<br/>
LPG연료 엔진의 피스톤온도 및 카본디포짓 형성에 관한 연구
민병순(B. S. Min),최재권(J. K. Choi),박찬준(C. J. Park) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.2
The wide open throttle performance and piston temperatures were measured by the change of fuel : gasoline and liquefied petroleum gas (LPG). Bench test method was developed and experimented to study the effect of temperature on the formation of carbon deposit. The bench test results were confirmed by measuring the piston temperature and observing the deposit production rate at an actual engine running condition. Results show that if the fuel of spark ignition engine is changed from gasoline to LPG, the output power decreases about 10% and the piston temperatures increase about 40~55°C. In actual engine tests, because of this temperature increase, it was observed that the quantity of carbon deposit in the top ring groove increased in a big degree. Consequently, it is known that the ring sticking may occur if the gasoline engine was rebuilt to LPG fuelled engine. Therefore, in order to preserve the durability of LPG fuelled engine, it is necessary to lower the piston temperature by hardware modification or to reduce the carbon deposit by the improvement of engine oil.