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Longitudinal 9-speed Dual Clutch Transmission for 2nd-generation NSX

Article of Honda R&D Technical Review Vol.29 No.1


The world’s first longitudinal nine-speed dual clutch transmission was developed for the second-generation NSX. Its purpose is to realize the design, acceleration performance, and dynamic performance that are appropriate in a supercar for the new era, as well as to provide smooth, comfortable driving on city streets and on expressways. By eliminating the shift mechanism for first gear and sharing the transmission gears, the total length was reduced 120 mm relative to these measures not being applied, achieving a rear overhang that is 35 mm shorter than other manufacturers’ supercars with seven-speed dual clutch transmission. In order to deal with the higher power output, the optimal oil was respectively used for the clutch and gear rooms, while the adoption of a high-capacity dual wet clutch, high-strength gear material, and high-strength case material increased capacity to 550 Nm. In order to deal with high-load driving on the circuit and under other such conditions, the respective cooling and lubrication systems for the clutch and gear rooms were optimized by the use of four heat exchangers and a baffle cover that completely encloses the clutch. The gear ratio was optimized for each shifting stage, the rigidity of the shift fork was increased, and a double-cone synchronizer was adopted for second to fifth gears, thereby realizing high gear change response while retaining quiet cruising at high speeds.


(1) Takahashi, K., Urushihara, K.: Hybrid System Heat Management that Contributes to High Performance for New NSX, Honda R&D Technical Review, Vol. 28, No. 2, p. 74-79
(2) Kawai, N., Ohta, K., Masaoka, Y., Konishi, H., Kobayashi, H.: Development of 7-speed Dual Clutch Transmission for SPORT HYBRID i-DCD, Honda R&D Technical Review, Vol. 26, No. 1, p. 28-33

Author (organization or company)

Masaru KURIHARA(Automobile R&D Center)、Takao UENO(Automobile R&D Center)、Tatsuya NODA(Automobile R&D Center)、Ryuhei KATAOKA(Automobile R&D Center)、Shunji KAMO(Automobile R&D Center)、Akio MUTO(Automobile R&D Center)

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