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수동 변속기 차량의 공회전시 이상 소음 저감을 위한 클러치 개선에 관한 실험적 연구
진용욱(Y.W.Jin),허만대(M.D.Hur),한경래(K.R.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Research for idling rattle noise is one of the most important issues for noise reduction in diesel engine vehicles. Although many researchers reported optimization methods for clutch torsional characteristics to reduce the idle gear rattle, only a few researchers take into account the clutch damper as a design parameter. This paper investigates an erratic noise during idling condition in the drive train. Through the theoretical and experimental analysis, it is concluded that the erratic noise is mainly due to the resonance in the clutch. This paper also describes a design modification for the pre-damper clutch to remove the erratic noise.<br/>
클러치 마스터실린더 컵-시일 고무의 마찰계수 실험 연구
이재천(J.-C. Lee),임문혁(M.-H. Im),차종조(C.-J. Cha),허만대(M.-D. Hur) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The friction coefficient of the rubber for clutch master cylinder were experimentally measured in this study. The cylinderical rubber samples for primary cup-seal and secondary cup-seal were tested against the aluminum or the steel plates of master cylinder housing under the various conditions of brake oil temperatures and normal loads. Dry sliding friction coefficients were also measured under various load conditions.<br/> The test revealed following results. First, the friction coefficient under fluid lubrication condition in general decreases, as the oil temperature or normal load increases. Second, the steel plate of low surface roughness yielded comparatively low friction coefficient on the range of 0.30~0.67 while the aluminum plate of high surface roughness yielded high friction coefficient on the range of 0.31 ~1.15. Third, the friction coefficient of dry surface contact decreases as the normal load increases contrary to the general principle of friction coefficient between metal plates.<br/>
류하오(Hao Liu),이재천(J. C. Lee),조종환(J. H. Cho),허만대(M. D. Hur) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
Due to high efficiency and easy control convenience of dual clutch transmission (DCT), nowadays DCT is increasingly applied on passenger vehicles. As a main component of DCT, dry dual clutch (DDC) should smoothly transmit power to the odd or even gear set. Frequent engagement and disengagement lead temperature increasing of the contact facing of the DDC. Too high temperature would speed up degradation or serious wear of the pressure plate and burning of the disk. It is significant to know the thermal model of the DDC during the period of development and design. By analyzing each component of the DDC, a lumped thermal model is proposed in the paper. Base the thermal model, simulation by using simulink is performed according to the experimental condition. The simulation results show consistency with the experiment, which validates the proposed thermal model of the DDC.