무단변속기(CVT)용 토크컨버터의 입력회전수와 속도비에 따른 록업클러치 작동 응답성에 관한 연구

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. To reduce more fuel consumption, the slip is generated between a friction facing and a front cover for torque converter lock-up clutch. Also many studies of NVH and durability have been in order to increase lock-up area. In a lock-up clutch system a friction plate is one among key elements of torque transfer and is a made of wet friction material by synthetic fiber. The surface roughness of the front cover contact area, the friction material, the cooling condition and damper characteristics in a torque converter are important design parameters for the improvement of NVH and durability. Factors decide characteristics of friction material and material composition, apply pressure, rotation speed, ATF temperature. This test evaluates response time of lock-up clutch at changing ATF temperature and input revolution and speed ratio.