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후륜 자동차용 토크 컨버터의 마찰재 드래그 토크 감소에 대한 연구
이인태(In-Tae Lee),김재수(Jae-Soo Kim),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
A torque converter in automatic transmission transfer the engine power to transmission by ATF. The mechanical device which is called lock-up clutch connects directly between a engine and a automatic transmission for the high efficiency and the low fuel consumption. Also many studies of NVH and drivability have been in order to increase lock-up area. In a lockup clutch system a friction plate is one among key elements of torque transfer and is made of wet friction material by synthetic fiber. The surface roughness of the steel plate, the friction material, the cooling condition and the damper characteristics in a torque converter are important design parameters for the improvement of NVH and drivability. Factors decide characteristics of friction material and material composition, apply pressure, rotation speed, ATF temperature. This test evaluates drag torque and hydrodynamic performance of friction plate shape and ATF temperature, rotation speed.
슬롯을 갖는 토크 컨버터 리엑터의 성능 특성에 관한 연구
박태준(Tae-Jun Park),이웅철(Woong-Chul Lee),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper discussed the application of a slotted reactor blade to enhance performance characteristic of a torque converter. In order to estimate performance characteristics of torque converter by slot angle of reactor, several slotted reactor blades were newly generated with different slot angles. Using three-dimensional CFD program, CFD-ACE®, torque converters with these reactors were analyzed. The analysis results show that a torque converter with slotted reactor gets more flat capacity factor and optimal slot angle of reactor exists. Also, CF and Tr decrement at stall in a torque converter with holed reactor are less than those in a torque converter with slotted reactor.
토크 컨버터 토러스 형상 변화에 따른 유동 특성에 관한 연구
최완(Wan Choi),권의섭,장영기(Young-gi Jang),장재덕(Jae-duk Jang),주인식(In-sik Joo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The torque converter is a very complex turbo machine. Its geometry is highly three-dimensional, the working fluid is viscous oil, and it operates under a wide range of flow conditions. However, its hydrodynamic design technology has advanced very little during the past serveral decades. The design procedure has been based greatly on the use of the cut-and-try approach. The use of such an approach may satisfy the design requirements in terms of diameter, axial length, and torque capacity factor, but it may never lead to optimized design for any given application. In addition, it has been proven to be too costly and time consuming. The current design tools need to be upgraded in order to significantly advance the hydrodynamic design technology. A review of the technology needs in the areas of internal flow, torus design, and performance is presented. At first, the three dimensional internal flow fields and the physical mechanisms of the internal flow losses are described. Secondly, case analyses of a torus shape, using potential flow and viscous flow by the finite element method, are shown. Lastly, technology is required to develop an optimum performance model is presented.
후륜 자동차용 토크 컨버터의 드래그 토크가 유체성능에 미치는 영향
이인태(In-Tae Lee),송재훈(Jae-Hoon Song),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Friction plate, one of key elements for torque transfer in lock-up clutch system, is made of wet friction material by synthetic fiber. Drag torque by these friction plates affects hydraulic performance of torque converter. This study showed the relationship between drag torque and hydrodynamic performance of torque converter with different number of friction plates at various ATF(Automatic Transmission Fluid) temperatures and rotation speeds.
해석 및 시험을 통한 토크 컨버터 러그 용접 강도에 관한 연구
이웅철(Woong-Chul Lee),홍순석(Soon-Seok Hong),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Torque converter in automatic transmission transfers the engine power to transmission by ATF. It is connected on engine and have to withstand against high engine torque. Generally lug on torque converter is welded on front cover and is bolted to the drive plate of engine. Because of high engine torque, welding durability of lug is important. This paper discussed welding durability of lug through the static structural analysis and test. The static structural models of the lug and welding bead are developed by interfacing the finite element model. The static structural analysis of the lug is investigated by modeling the front cover assembly using Pro-E and analyzing with ANSYS. This paper is provided torque converter engineer with useful information for durability design.
토크컨버터 슬립 제어 록업 클러치 차압 불안정 요소에 관한 연구
이웅철(Woong-Chul Lee),김진문(Jin-Moon Kim),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Torque converter in automatic transmission transfers the engine power to transmission by ATF. Lock-up clutch of torque converter in automatic transmission has been recently designed with a significant purpose of achieving a more fuel economy. To reduce more fuel consumption, the slip is generated between a friction facing and a front cover for torque converter lock up clutch. This paper discussed unstable factors of differential pressure for torque converter lock-up clutch with slip control and seal ring type. Cycle time of torque converter products is delayed due to unstable of differential pressure for slip control lock-up clutch. Therefore, It is very important that the torque converter engineers search for unstable factors of differential pressure and try to find a solution.