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[가솔린엔진부문] 직동식 밸브트레인 시스템의 캠/태핏 접촉부의 혼합 윤활 해석
신홍주(Heungjoo Shin),조명래(Myungrae Cho),한동철(Dongchul Han) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper reports on the mixed lubrication characteristics between the cam and tapper contact surface on the direct acting type valvetrain systems. At first, the dynamic characteristics are solved by using the lumped mass method to determine the load conditions at the contact point. And then, the minimum oil film thickness is calculated with consideration of elastohydrodynamic line contact theory and friction force is obtained by using the mixed lubrication model which separates hydrodynamic and boundary friction. Finally, the average surface temperatures are calculated by using the flash temperatures theory. As results of analysis, there are some peak in the friction force due to the asperity contact friction, and flash temperature at the position of minimum oil film thickness. It is thought that there is some relation between the surface temperature and cam surface wear, therefore the analysis on the worn cam profile has been performed.