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김한구(Han Goo Kim),김청균(Chung Kyun Kim) 한국트라이볼로지학회 2009 한국윤활학회지(윤활학회지) Vol.25 No.1
In this paper, the minimum oil film thickness and the maximum oil film pressure of engine bearings have been analyzed by using the elastohydrodynamic theory and Taguchi's design method as functions of the oil groove width, oil hole diameter, oil hole position, and oil supply pressure. The optimized design of the engine bearing for an automotive Diesel engine is very important for supporting a load-carrying capacity due to gas pressures from the engine combustion chamber and inertia forces of the piston. The optimized design data of engine bearings indicated that the optimized oil groove width and an oil diameter of a engine bearing are 8㎜ at the speed of2,000 rpm for a given 4-cylinder Diesel engine. Thus, the oil groove oil groove and an oil hole for high performances of an engine bearing may be considered as major design parameters compared to other design factors, which are strongly related to the minimum oil film thickness and the maximum oil pressure distribution of the engine oil.
엔진오일의 저점도화에 따른 엔진 베어링의 유막거동에 관한 연구
김한구(Han Goo Kim),김청균(Chung Kyun Kim),이일권(Il Kwon Lee) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
The purpose of this paper is analyzing oil film behaviors of engine bearing, when viscosity of engine oil is lowered for the purpose of fuel economy improvement. The friction loss power, the minimum oil film thickness and oil film pressure distribution for a engine bearing is analyzed using an AVL's EXCITE program. The computed results indicate that a close correlation has been found between the engine oil viscosity and the friction loss power. When the low viscosity engine oil is applied, its effect on the minimum oil film thickness is revealed as insignificant. Nevertheless, the low viscosity engine oil inevitably brings the reduction of the friction loss power. The lowering of engine oil viscosity causes the reduction of friction loss power which has a very close relation with the fuel economy. These results as the lowering of engine oil viscosity will be a important factor for improvement of the fuel economy in future.
엔진오일의 저점도화가 차량 연비에 미치는 영향에 관한 실험적 연구
김한구(Han Goo Kim) 한국트라이볼로지학회 2010 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.26 No.5
The purpose of this paper is to study the fuel economy improvement experimentally when the viscosity of engine oil is lowered. The emissions are measured for CVS-75 mode with SAE viscosity grades. The test results indicate that a close correlation has been found between the engine oil viscosity and the fuel economy. The lowering of engine oil viscosity causes the reduction of friction loss which has a very close relation with the fuel economy. These results as the lowering of engine oil viscosity will be a important factor for improvement of the fuel economy and reduction of the CO₂ emission.
엔진오일의 저점도화가 차량 연비에 미치는 영향에 관한 실험적 연구
김한구(Han Goo Kim),김청균(Chung Kyun Kim),현영준(Young June Hyun) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
The purpose of this paper is studying fuel economy improvement experimentally, when viscosity of engine oil is lowered. The emissions are measured for CVS-75 mode with SAE viscosity grades. The test results indicate that a close correlation has been found between the engine oil viscosity and the fuel economy. The lowering of engine oil viscosity causes the reduction of friction loss which has a very close relation with the fuel economy. These results as the lowering of engine oil viscosity will be a important factor for improvement of the fuel economy and reduction of the CO₂ emission.