Search Results

Electric vehicles are rapidly increasing in the global market. Most electric vehicles have adopted a single-speed gearbox, which is a double reduction gear set. Although the traction motor of an electric vehicle has a wide rotational speed range, the single-speed gearbox has the disadvantages of lowering the efficiency of the motor operating region and limiting the maximum vehicle speed. To overcome the shortcomings of the single-speed gearbox, it is necessary to apply a 2-speed transmission to electric vehicles. Based on the patent of system configuration, a unique 2-speed transmission with a planetary gear set and two synchronizers set developed and applied to electric vehicle. The advantage of this 2-speed transmission is that traction force increases by more than 40% at first gear and top speed increases by more than 30% at second gear. The system configuration was designed with the idea of making compact, efficient and cost-effective product.