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연속 가변 밸브 듀레이션 기구 동특성 분석 및 피로수명 예측
이주환(Juhwan Lee),박동헌(Donghun Park),이승재(Seungjae Lee),손유상(Yousang Son),하경표(Kyoungpyo Ha),정준욱(Junwook Jeong),김성준(Seoungjoon Kim) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
A Continuously Variable Valve Duration (CVVD) engine has been developed. The CVVD mechanism can change valve duration of an engine relatively shorter and longer than the conventional ones. Thus, it can improve fuel efficiency of a gasoline engine by reducing compression work at part load condition, and can also improve low end torque by increasing volumetric efficiency at wide open throttle condition. But, the CVVD consist of many parts by contacting between parts. So, it is possible to have a problem about durability, wear. This study deals with wear of worm wheel & fatigue life of bracket & dynamic characteristic of valve-train. And a multi-body model has been developed in order to achieve detailed knowledge on dynamic loads. Also this study proposed a new design for improvement about wear, durability, dynamic characteristic.