Abstract
Improvement in performance of a torque converter is needed for expansion of the operating range of a lock-up clutch. It is indispensable to understand the transitional characteristics of the fluid flow near the lock-up clutch for that purpose. In this research, the lock-up clutch was operated and the pressure distribution near the clutch corresponding to the change in input oil pressure and the change in the speed ratio and clutch displacement were investigated. Results show that, the delay of the response time of the clutch by the change in the speed was not seen.However, the result that engaging-of-clutch power became large was obtained, so that the number of revolutions by the side of input and output had a difference.
