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토크 컨버터 록업클러치 마찰면 온도에 대한 수치해석적 연구
김희영(Heeyoung Kim),권의섭(Eaisub Gwon),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Automatic transmission vehicle has many advantages over the convenience of driving, acceleration, smooth shifting and the small impact than manual transmission. But, Torque converter used ATF to transfer the power of an engine to an input shaft. Driveline system moved by working fluids brings the loss of power. To solve this problem, a key element of torque converter functions is a Lock-up clutch. The torque converter connects an engine and auto-transmission directly for better fuel enconomy. To reduce more fuel consumption, the slip is generated between a friction facing and front cover these days. The slip however has the bad influence on the torque converter. the heat caused by the slip make the deformation of torque converter. After all, the powertrain system is out of order. In this study we proposed the new analysis method. To analysis the heat transfer between the friction facing and a front cover, the contact pressure analysis is carrien out first. The heat generation predicted is used as the boundary condition of CFD. The comparison between numerical analysis data and experiment data has also been performed.
차량 경량화를 위한 토러스 축소와 고토크 토크컨버터 연구
김희연(Heeyeon Kim),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Torque converter in automatic transmission transfer 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. The newly developed round-high torus for short axial length achieves a high torque capacity and high efficiency. The new elliptical torus torque converter replaces the full torus about Φ205mm some of the Φ220 ~ Φ230mm converter that were previously used in similar applications. In a fuel-consumption conscious world, the minimum goal for the new elliptical torus converter must be to perform at least as well as its predecessors. To reduce development time and cost, many kinds of CAE technology is used. This paper describes for the new torus torque converter with lock-up operation.
CFD를 활용한 토크컨버터 유동성능 해석의 최적기법 연구
김희연(Heeyeon Kim),권의섭(Eausyb Gwon),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Torque converter located in automatic transmission is important role that absorb the vibration of the engine and torque conversion. To improve vehicle performance, development of the torque converter matching to advanced engine performance is essential. The torque converter consist of impeller, turbine ,reactor and complex three dimensional shape. In order to implement a fluid performance according to the characteristics of the vehicle. Final shape is determined through repeated analysis. Flow analysis of the torque converter is essential. Time required for the analysis and accuracy of the analysis is most important. The paper proves that how to minimize the space and analysis method for determining the size of the grid to maintain the accuracy of the interpretation.
전자형 댐퍼 적용을 통한 차량 비틀림 진동 절연 특성 최적화
이성은(Seongeun Lee),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.4
Torque converter is located between the engine and automatic transmission and transfers power to the automatic transmission from the engine. Under opened condition of lock-up clutch, the power is transferred to the transmission by ATF(automatic transmission fluid) and under closed condition of lock-up clutch, torsional vibration is damped by damper system. Recently, in order to improve the fuel economy in vehicle, it has been tried to lower torque converter lock-up speed and internal combustion engine is composed of the latest technology with direct injection, variable compression ratio, variable engine displacement, cylinder deactivation. Accordingly, this trend is likely to cause the abnormal vibration accompanied by the vehicle vibration. To overcome disadvantageous vibration characteristics, Several type of advance damper system have been developed. This research did an analysis of the vehicle power train model using Simulation X<SUP>®</SUP> that is a commonly used program for analyzing vehicle dynamic characteristics. it is focused on developing that the vehicle vibration characteristic is optimized by the damper system with pendulum damper.
정석열(Seokyeol Jung),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In automatic transmission of vehicle, an operating fluid of the Torque Converter inflows to Turbine from Impeller, and it is taking charge of role as intermediate of power transfer device. Also Torque Converter has Lock-Up Clutch System, and it will be operated if there is some condition more than certain speed ratio. Nowadays, Automobile Industry puts emphasis on the improvement of Fuel Efficiency, and many research of the Torque Converter also try to improve the Fuel Efficiency through the application of new technology to Lock-Up Clutch and Damper System Regarding Lock-Up clutch, it tried to enlarge the Direct-Connect Area by the Slip control, and optimization of Piston is very important design component of Slip control. The Shape of Piston of the Lock-Up Clutch System has large influence to operation response, Transmit Torque, Shudder. This research presents the influences of the Piston Shape to the system and provides the optimized design method with Finite Element Method and Simulation to make better design of the products.
피스톤 홀 위치에 따른 록업 클러치 냉각유량에 관한 연구
홍준표(Junpyo Hong),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
New torque converter clutch works at low speed area for high fuel efficiency. This trend caused heat problem of friction material in lock-up clutch. Heat may cause the damage of friction material. Friction material. Friction material require cooling flow rate for guarantee of material life. In order to improve cooling, torque converter adapted the system by introducing the cooling hole in lock-up piston. However cooling hole causes torque drop because the oil flow for cooling lowers the pressure in the clutch piston. Torque converter designers should consider proper flow rate and torque for engine. Therefore the torque and hole size estimation is required for the early stage of torque converter design. Estimation equation was derived based on the physical background such as the centrifugal force, sudden expansion, sudden contraction and Bernoulli`s equation.
박진수(Jinsu Park),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Torque converter located in automatic transmission is a important part that determines fuel economy and power transmission of vehicle. Although it has advantages, because of power transmitted by fluid, the engine power loss never avoid. In order to improve fuel economy, Lock-up clutch that directly transmits the engine power to the automatic transmission is equipped in torque converter. This paper discussed facing-pressure distribution of torque converter considering thermal deformation. To analysis facing pressure distribution, this suggests optimization angle of piston. And this is provided torque converter engineer with useful information for lock-up clutch design.
권기보(Kibo Kwon),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Torque Converter located inside auto-transmission transmits power from engine to drive shaft during driving. The automatic transmission vehicles have many advantages same as convenience, speed of the smoothness and low-speed impact. In spite of many advantages compared with manual transmission, power transferred by fluid has inevitable drawbacks. Lock-up Clutch improving this loss, when driving a vehicle at the high speed, has a similar structure and characteristic of clutch of manual transmission as a device for a direct connection. When combined the Lock-up clutch, maximum efficiency is obtained.. But NVH is raised due to vibration and impact caused by the Lock-up device. Therefore various damper system is under development to solve these problems. Also, In addition to the goal of reducing NVH problems, It is greatly important to reduce the effect of oscillation, friction, and impact in damper’s service life. In this study, we propose the design approach to improve durability through the case study of stress distribution according to shapes of cut using Ansys Workbench in one of the commercial structure analysis programs.
이경열(Kyungryol Lee),김진문(Jinmoon Kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Cover plate for torque converter supports axial force generated by automatic transmission fluid circulation. Cover plate is fixed on front cover by projection welding. Welding defect is generated by the mismatch between a manufactured material and a method of production in manufacturing process. One of them is the case that the size of welding nugget is small. This research studied the effect of welding defect through finite element analysis. The concentration of stress usually happened in case the welding nugget formed is small. As a result, this part of production is brittle and fragile.