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자동변속기유의 마찰 및 점도 특성이 연비향상에 미치는 영향에 대한 연구
유성춘(Sungchoon Yoo),차상엽(Sangyoup Cha) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To reduce viscosity to be related to the flow resistance or to improve the friction property of automatic transmission fluid is one of the effective way to improve fuel economy of motor vehicle. This study shows that automatic transmission fluid to have a lower viscosity contribute to improve the fuel economy because reduce the torque loss and improve the transmittal efficiency, While Friction property did not help to improve the transmittal efficiency in the automatic transmission. Also, shows F/F type transmission is more affected by viscosity of ATF than F/R type transmission.
윤원진(Yoon WonJin),유성춘(Yoo SungChoon),배대윤(Bae DaeYun) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Attempts to develop a new test method for chemical stability of lubricants were made by a modified ISOT rig and Taguchi method of L?(2?) orthogonal arrays. Design of experiments showed that some factors such as temperature, NO₂, and catalyst had significant effect on chemical stability of lubricants. Test results from the rig tests were then compared with vehicle tests and the newly developed test method showed close correlation between the bench test and vehicle test in chemical stability of lubricants.
장시열(Siyoul Jang),김승재(Seungjae Kim),김재홍(Jaehong Kim),배대윤(Daeyoon Bae),유성춘(SungChoon Yoo) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
It is important to decide the minimum film thickness and viscosity variations of a multigrade lubricant in the contact surface under the high pressure conditions. By carrying out acceleration, deceleration, and various sliding-rolling ratio movement between two contact bodies, it is experimented that film formation variations in the contact surface are captured with multigrade lubricants in order to exactly investigate the variations of film formations. Optical interference images are continuously captured with high resolution CCD camera during the captured period of acceleration, deceleration. The friction forces between the contacting bodies are also measured simultaneously with the film formation.