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Development of a Compact CVT for a Hybrid Car – Insight

Article of Honda R&D Technical Review Vol.12 No.2


The continuously variable transmission (CVT) used in the Insight, a hybrid car, was developed using the basic construction of Honda’s conventional CVT but with the aim of lighter weight, smaller size, and greater efficiency. This CVT optimizes line hydraulic pressure by utilizing a direct control system for pulley hydraulic pressures and differentiated drive-driven pulley pistons. The mechanism also uses such means as lubricant pressure control to reduce friction in each part, expand the ratio range, and improve the efficiency of engine-motor cooperative control. Further, the utilization of such devices as a forward-reverse select mechanism that operates with a single-pinion planetary gear served to reduce the number of parts.


(1) K. Ohsono, T. Aoki: “Development of Full-electronic Control Metal Belt CVT”, Honda R&D Technical Review, Vol.8, p.21-33 (1996) (Written in Japanese)
(2) K. Fukuo, A. Fujimura, M. Saito, K. Tsunoda, S. Takiguchi: “Development of the Ultra-Low-Fuel-Consumption Hybrid Car - Insight”, Honda R&D Technical Review, Vol.11, No.2, p.1-8 (1999) (Written in Japanese)
(3) T. Yamaguchi: “CVT Control for Honda IMA System”, No.9908 JSAE Symposium, New Technologies for Power Transmission ’99, p.37-40 (1999) (Written in Japanese)
(4) M. Sumi, S. Fujimoto: “Development of Compact CVT for Hybrid Vehicles”, Journal of JSAE, Vol.54, No.4, p.48-54 (2000) (Written in Japanese)
(5) A. Fujikawa, A. Aoki: “Hydraulic and Electronic Control Systems for CVTs for Hybrid Vehicle”, Proc. of JSAE, No.67-00, p.1-4 (2000) (Written in Japanese)
(6) K. Yamamoto, T. Aoki: “Analysis of CVT and Automated MT Influence on Fuel Economy, and the Estimated Improvements in Fuel Economy”, Honda R&D Technical Review, Vol.12, No.1, p.63-72 (2000) (Written in Japanese)

Author (organization or company)

Shouji OHTA(Tochigi R&D Center)、Hisashi KUNII(Tochigi R&D Center)、Makoto SUMI(Tochigi R&D Center)、Shuichi FUJIMOTO(Tochigi R&D Center)、Tetsuro YAMAGUCHI(Tochigi R&D Center)

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