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We have developed an electric rear-drive unit to enable all-wheel drive (AWD) applications to the compact FF hybrid passenger vehicles. The development is intended to provide a compact and low cost unit with low fuel consumption. The unit newly introduces a two-axis gear train that enables a compact design, an induction motor and an ATF (automatic transmission fluid) stirring resistance restraining structure that contribute to lower fuel consumption. This paper presents the features and performance of the electric rear-drive unit.

Recently, hybrid systems for commercial vehicles have been rapidly proliferating, and demands for a reduction in CO2 have been growing concurrently. Under this circumstance, we developed a hybrid front module containing a large-diameter, thin type motor generator tailored to the characteristics of commercial vehicles, and a front clutch mechanism capable of disconnecting the engine and the drive train from each other. One of the main features of this module is the large-diameter, thin type motor generator that adopts a rotor manufactured by a winding-laminating process for low-cost manufacture and a concentrated-winding stator using a segmented stator core. Mounted inside the large-diameter, thin type motor generator is a normally closed type multiplate wet clutch designed to disengage by hydraulic pressure supply by an electric oil pump, achieving a thin and compact structure.