Worm gear structure and automobile electric steering system

The utility model provides a worm gear structure and an automobile electric steering system. The worm gear structure comprises a worm gear and a worm. The worm gear is meshed with the worm; the worm gear comprises a metal insert, a connecting body and a worm gear tooth-shaped body. The connecting body is arranged on the peripheral side of the metal insert, and the worm gear tooth-shaped body is arranged on the peripheral side of the connecting body. The worm gear is divided into the worm gear tooth-shaped part and the connecting body, the connecting body made of the nylon material can bear very high torque, the torque requirement of electric power steering gears of commercial vehicles, heavy duty vehicles and the like is met, the worm gear tooth-shaped part made of the polyether-ether-ketone material is high in fatigue strength and resistant to pitting corrosion and abrasion, and the requirement for the whole lifelong life of an automobile is met. 本实用新型提供了一种蜗轮结构及汽车电动转向系统，包括：蜗轮和蜗杆；所述蜗轮与所述蜗杆啮合；所述蜗轮包括：金属嵌件、连接体以及