Engine cooling fan is an important part of the vehicle cooling system. The performance of the fan has direct influence on the engine cooling effect, which will then affect the performance of engine. Compared with the previous generation of products, its weight reduces by 15%, size lowers by 14%, and power density is optimized by 40%. Therefore, it is firmer and can adapt to the tough installation environment, which further improves the product safety and makes it reliable in operation and strong in overload protection performance.