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VFS 제어장치를 통한 자동변속기 주축 회전에 따른 변속기유 분출량 측정 연구
장시열(Siyoul Jang),이덕재(Duckjae Lee),박준수(Junsu Park),김학수(Haksu Kim),신동혁(Donghyuk Shin),이정선(Jeongseon Lee) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
The number of automatic transmission in use has been gradually increasing due to driving convenience. In order to increase efficiency and decrease shift shock, the structure of automatic transmission has been complicated. In order to ensure high reliability of the automatic transmission, it is very important to feed the proper quantity of lubricating oil to key parts of the automatic transmission. This study is performed on oil flow distribution measure though each oil hole inside the main shaft supplying ATF for system part by VFS(Variable Force Solenoid-valve) Control Apparatus. Oil flow, pressure and rotation speed are varied. Changes in flow rate with rotation speed are obtained. The study lead to the development of a model to analyse oil lubrication in the automatic transmission line.
무단 변속기의 동력전달 접촉에서 회전운동을 고려한 타원형상의 점접촉 탄성유체윤활연구
장시열(Siyoul Jang) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.6
Continuously variable transmission (CVT) of toroidal type has a elliptical shape of contact zone under the elastohydrodynamic lubrication (EHL) condition, where the power is transmitted only by shearing the lubricant. Due to the small contact area of elliptical shape, the traction of the shear behaviors of lubricant over the contact zone is under extremely high contact pressure over 1.0 GPa. During the power transmission by shearing the fluid, many kinds of mechanical movements occur such as squeezing, sliding, rolling and spin. Among the movements, the spin effect that is the most undesirable contact behavior in transmitting the power frequently makes significant abnormal wear damage. In this work, the analysis of elliptical contact of EHL with spin effect is performed, which will give very useful information to understand the traction behaviors in toroidal type of CVT system.
크랭크 핀의 질량관성을 고려한 엔진 베어링의 틈새 거동 연구
장시열(Siyoul Jang) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.1
Investigation of the mass effect on the journal traces in the clearance of engine bearing has been performed for better design of mass distribution of crank system components such as crank pin, piston, con-rod, balance weight, crank throw weight, etc. as well as for better oil reaction behaviors to the applied forces from the cylinder pressures on the bearing. In this preliminary study, crank pin traces in the engine bearing clearance are computed by varying the equivalent magnitude of crank pin mass that includes the masses of crank pin, piston, con-rod, etc., while most previous studies regarding journal traces in the bearing clearance neglect the inertia effects of crank pin mass. Although the inertia effect of pin mass is negligibly small compared to viscous force by π bearing theory, it is found that it gives a great amount of influences on the journal traces in full bearing computation (2π bearing theory) under the dynamic loading conditions.
동하중 조건에서 마이크로 크기의 공기 혼입 윤활유의 틈새 거동 연구
장시열(Siyoul Jang) 한국트라이볼로지학회 2006 한국윤활학회지(윤활학회지) Vol.22 No.1
This work analyzes the behaviors of aerated lubricant in the gap between con-rod bearing and journal. Aerated lubricant influences two major factors on the film formation. One is the density characteristics of the lubricant due to the volume change by the bubbles and the other is the viscosity characteristics of the lubricant due to the surface tension of the bubble. Those two major factors surprisingly increase the load capacity in certain ranges of bubble sizes and densities. Modified Reynolds' equation is developed with the consideration of aerated ratio in the lubricant and journal locus is computed with the Mobility method after the computation of two dimensional pressure distributions over the bearing area.
장시열(Siyoul Jang),조재철(Jae Cheol Cho) 한국트라이볼로지학회 2009 한국윤활학회지(윤활학회지) Vol.25 No.6
Many research of elastohydrodynamic lubrication (EHL) has been performed under the condition of steady state loading. However, mechanical elements undergo severe high loads that are in the fluctuating modes of frequency and amplitude. Conventional numerical method for the circular contact of EHL study has the difficulty in making the film thickness and pressure of EHL converged in high loads of steady state as well as fluctuating loading conditions. In this work, multigrid multilevel method are used for the stable convergence of film pressure and thickness under the conditions of high as well as varying loads, and very stable solutions of film behaviors with elastic deformation are obtained. Several results of dynamic loading condition are shown and compared with those of steady state condition in the aspects of circular EHL film thickness and pressure.
장시열(Siyoul Jang),김도환(DoHan Kim),김명식(Myongsik Kim),최완(Wan Choi),장영기(Younggi Jang),한관수(Gwansoo Han),장재덕(Jaeduk Jang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Wet clutch is widely used for the power flow distribution in various mechanical systems. Especially, in the automatic transmission system wet clutch is adapted in the forms of multi disc clutch and lock-up clutch subsystems. Wet clutch is made of soft paper based friction material and metal plate for the mating friction performance and it is operated under high hydraulic pressure for the clutch engagement. All of the engagements are working under the ATF environment that has the function of less frictional contact behaviors. In this study, the contact deformation, surface roughness, porosity behaviors of paper based friction material and the centrifugal effects of ATF during the engagement process are studied.
이중 투사 광선에 의한 고해상도 탄성유체윤활 유막 측정 기술
장시열(Siyoul Jang) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
Many technologies are applied to the measurement of elastohydrodynamic lubrication (EHL) film thickness. In particular, optical in-situ 'interferometric method has many advantages in making the actual contact behaviors realized with the experimental apparatus. Careful selection of incident lights greatly enhances the fringe resolution up to nanometer scale by using image processing technology. In this work, it is found that dichromatic incident light can provide much finer resolution of EHL film thickness than monochromatic incident light, because it has much more variables of color components to be discriminated among the wavelengths of colors according the variations of EHL film thickness. Some simulated interferometric images are shown how the film thickness is resolutionized in nanometer scale.
장시열(Siyoul Jang),박계민(Gaemin Park) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
The engine bearing transmits the powers from cylinder to crankshaft with small clearance between con-rod and crankpin. The minimum oil film thickness is a significant parameter in the operation of bearing. The contact pressure of bearing should be considered for the reason that elastic deformation of bearing be caused by contact pressure of bearing. There are important factors which are maintaining of minimum oil film thickness, expecting of the length of maximum and minimum oil film thickness with changing of the loads to keep running normally. Furthermore, this study is very crucial to develop the design of engine bearing and crankshaft system.