A New Powertrain of Two Speeds for Pure Electric Vehicle

Abstract

A power train with two speed gears was developed for driving pure electric vehicles. This new pure electric power train mainly includes one electric motor, a planetary gear set, a fork and sleeve mechanism and the main differential, which are formed in one integration mechanism. The fork and sleeve mechanism was added to this integration power train system for providing three different operation positions according practical conditions, its three operation positions are corresponding to three operation modes, which are high speed position, low speed position and neutral position. With this new mechanism, the power train system can reduce electric volume and increase driving torque, which can benefit vehicle layout with high energy efficiency.