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시내버스용 기계-유압식 무단변속기(CVT)의 설계기술 연구
이근호(Geunho Lee),김형의(Hyoungeui Kim),김도식(Dopsik Kim),정동수(Dongsu Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hydro-mechanical type CVT(Continuous Variable Transmission) developed for heavy and high power propulsion vehicle changes the speed by regulating the swash plate on the hydraulic pump & motor as variator. Therefore it is possible to generate high torque at low speed and to obtain the high power density as characteristics of hydraulic variator. To reduce the disadvantages of hydraulic pump & motor like as low efficiency and noisy problem, some parts of power could transfer by gear train. In this study, the application vehicle of hydro-mechanical type CVT is the city bus showing frequent stops and requiring the safe and smooth drivability because of standing passengers. The advantages of hydro-mechanical type CVT for city bus are the reduction of harmful exhaust gas by control the diesel engine as a constant at optimal operating speed and the offer the safe and comfortable drivability without shifting impact. Thus. the purpose of this study is proposed the direction of concept design that is essentially necessary for development of transmission and optimal methodology about design parameters and factors.<br/>