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6-Speed Manual Transmission for Honda S660

Article of Honda R&D Technical Review Vol.28 No.1

Summary

A six-speed manual transmission has been newly developed for use in the new model S660 two-seater open-top sports car.
The new transmission was developed as a compact six-speed manual that nevertheless can support up to 104 Nm of maximum input torque.
In order to take advantage of the engine characteristics, the gear ratios for the first five speeds were configured with close ratios. The sixth gear was configured with a cruise ratio to enhance the quietness of the cabin when cruising at high speeds.
The shift was configured with a short stroke to enable the quick handling of a sports car, and the load displacement characteristics during gear shift operation were optimized. This produced a smooth, moderate gear change feeling when shifting gears.
The noise caused by rotational speed fluctuation of the crankshaft, which is characteristic of three-cylinder engines, was reduced through the adoption of a no-backlash gear and friction washer.

Reference

(1) Yokoyama, T., Kuzuhara, K., Haginiwa, M., Takahashi, T., Nakamura, A.: Development of New Manual Transmission for Middle-Torque Engine, Honda R&D Technical Review, Vol. 24, No. 2, p. 54-61
(2) Matsuda, K., Manita, M., Yokomizo, K., Iwasaki, T., Haginiwa, M.: Development of Lightweight and Compact 6-speed Manual Transmission, Honda R&D Technical Review, Vol. 18, No. 1, p. 28-33
(3) Kitajima, K., Okada, Y., Hirano, K., Mitani, S., Udou, H.: Development of a High-revolution 6-Speed Manual Transmission for the HONDA S2000, HONDA R&D Technical Review, Vol. 11, No. 1, p. 39-44
(4) Murai, A., Okazaki, K., Okuno, K.: Sporty Shifting Feel of the HONDA S2000, HONDA R&D Technical Review, Vol. 11, No. 2, p. 73-78

Author (organization or company)

Masaaki IWASAKI(Automobile R&D Center)、Takuya HOSOKAWA(Automobile R&D Center)、Dohta YAMAMOTO(Automobile R&D Center)

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