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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.
안효재(Hyojae An),홍준표(Junpyo Hong),홍순석(Sunseok Hong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Lock-up clutch of a torque converter in an automatic transmission directly transmis the engine power to the transmission in order to achieve a more fuel economy. Damper spring, a core part of lock-up clutch system, makes the powertrain system stabilized by reducing the fluctuation torque of any engine system when lock-up clutch is operated. To analysis stress concentration when the torque converter’s damper spring operates, simulation has been carried out by using DAFUL, a dynamic analysis commercial code. As a result, when the damper operates, can analysis spring’s stress distribution and spot of the maximum stress. Furthermore, can analysis reaction force acting on damper plate.