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Super Ultra Flat Torque Converter with Multi Plate Lock-up Clutch

Article of Honda R&D Technical Review Vol.21 No.1


Three-dimensional CFD was used to optimize the torus section and stator blade shape, and newly developed stator blades were also employed to develop the fluid flow channels for a thin type torque converter with a flattening ratio of 50%, while maintaining torque converter performance. A multi-plate lock-up clutch with heat-resistant performance approximately twice that of a conventional single-plate lock-up clutch has been positioned in the space created by the use of these new fluid flow channels. The developed Super Ultra Flat torque converter with multi-plate lock-up clutch enables all-area LC control without increasing the overall width compared to the previous torque converter, and can be fitted in an FF vehicle. As a result, in real-world driving, the new system increased fuel efficiency by approximately 3% in US06 mode, and enabled a more direct driving feeling by shortening the time from 0 to 100 km/h at 100% throttle acceleration by 0.2 s.


(1) Launder, B. E., Spalding, D. B.: The numerical computation of turbulent flows, Comput. Methods Appl. Mech. Eng., Vol. 3, p. 269-289 (1974)
(2) Patankar, S. V., Spalding, D. B.: A Calculation Procedure for Heat, Mass and Momentum Transfer in Three-Dimensional Parabolic Flows, Int. J. Heat Mass Transf., Vol. 15, p. 1787-1806 (1972)
(3) Abe, H., Miyoi, N., Yamashita, T., Shirakigawa, K.: Practical Simulation Method by Compensating the Outlet Flow Angle of a Stator, 1995 JSAE Annual Congress Proceedings, No. 951, p. 121-124 (1995)
(4) Abe, H., Maruyama, T., Sakatou, M.: Development of an Ultra Flat Converter by Applying Three-dimensional Computation Fluid Dynamics, Honda R&D Technical Review, Vol. 13, No. 1, p. 75-80

Author (organization or company)

Hiroya ABE(Automobile R&D Center)、Tooru TAKAHASHI(Automobile R&D Center)、Masaaki TSURUOKA(Automobile R&D Center)、Hiroshi TAKANO(Automobile R&D Center)

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