Power transmission of half-toroidal traction drive continuously variable transmission (four-wheel-drive CVT design and its performance)

Hirohisa Tanaka, Masatoshi Eguchi, Hisashi Machida, Takashi Imanishi

Research output: Contribution to journalArticle

6 Citations (Scopus)


Four-wheel drive offers cruising stability and high road gripping force at the expense of the power weight ratio due to implementation of an additional mechanism of a center differential gear box with a torque split clutch. We developed a dual-cavity half-toroidal traction-drive continuously variable power transmission (CVT) for 3 L passenger cars in 1990, which can be easily remodelled into a CVT with two output shafts since it has two independent CVT units. Since the CVT has a hydraulic-control equal-force-transmitting mechanism for speed ratio control, it is easy to synchronize the force transmission of front and rear axles without using a center differential gear box. In this paper we describe the mechanism, efficiency and control principle for the equivalent function of a center differential gear box of the four-wheel-drive CVT with nominal input torque capacity of 250 N·m, rotational speed of 5500 rpm and maximum speed ratio range of 1:8.7.

Original languageEnglish
Pages (from-to)778-782
Number of pages5
JournalJSME International Journal, Series C: Dynamics, Control, Robotics, Design and Manufacturing
Issue number4
Publication statusPublished - 1995 Dec
Externally publishedYes


ASJC Scopus subject areas

  • Engineering(all)

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