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자동변속기 클러치 윤활 및 냉각해석을 통한 오일 홀 최적화
김학기(Hakki Kim),송경(Kyoung Song),박재인(Jaein Park),황동환(Dongwhan Hwang),김현석(Hyunsuk Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The flow rate of the automatic transmission fluid (ATF) from a input shaft to the clutch plates have been simulated as a three-dimensional and transient-state using the free surface method of commercial CFD code STAR-CCM+. During the disengagement of the wet clutch plates, amount of heat energy dissipated by the lubricating oil that flow the nominal gap between the plates which have relative rotating speed. To supply the oil equally into the nominal clearances among the friction plates, a lay out of the lubrication passage hole configuration is very important. Since the hole configurations can be changed by the hole number, shape and the position at the hub, the optimization of the oil hole configuration is necessary. It is difficult to estimate the flow rate of the lubricating oil exactly at each part of the automatic transmission because of its structural complexity under rotating conditions. This paper suggest the method that can estimate the optimal oil hole configurations which affect the temperature of the plates by using 1D ATF oil circuit simulation and the numerical thermal analysis program “clutchtherm” with the 3D CFD results. From this result, we can obtain various information about the lubricating state at every part of the plates and can help our judgment of whether lubrication is sufficient.
클러치 내부 오일 유동해석 기법을 통한 오일 공급홀 최적화
김학기(Hakki Kim),송경(Kyoung Song),박재인(JaeIn Park),정연민(YeonMin Cheong),황동환(DongHwan Hwang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The flow rate and the behavior of the automatic transmission fluid (ATF) from a input shaft to the clutch plates have been simulated as a three-dimensional and transient-state using the free surface method of commercial CFD code STAR-CD. During disengagement of the wet clutch plates, amount of heat energy dissipated by the lubricating oil that flow the nominalgap between the plates which have relative rotating speed. To supply the oil equally into the nominal clearances among the friction plates, a lay out of the lubrication passage hole configuration is very important. Since a hole configuration can be changed by the hole number, shape and the position at the hub, the optimization of the oil hole configuration is necessary. It is difficult to estimate the flow rate of the lubricating oil exactly at each part of the automatic transmission because of its structural complexity under rotating conditions. This paper suggest the oil hole configurations which can distribute the ATF uniformly around the multi-plates with the optimization method. From this result, we can obtain various information about the lubricating state at every part of the plates and can help our judgment of whether lubrication is sufficient