Automatic reversing apparatus

The invention discloses an automatic steering device; in a working process, the friction between a spiral lug boss and a spiral groove is point-contact sliding friction, thereby reducing the friction contact surface between the spiral lug boss and the spiral groove after a shaft sleeve and a belt wheel automatically lock, and leading the spiral lug boss and the spiral groove to automatically separate after the shaft sleeve and the belt wheel automatically lock. The automatic steering device comprises a left belt wheel, a nut, a left bearing, a main shaft, a left shaft pin, a left locating slot, a right locating slot, a right shaft pin, a right belt wheel, the shaft sleeve and a right bearing. The invention is characterized in that in the working process, the friction between the spiral lug boss and the spiral groove is point-contact sliding friction. The automatic steering device in the working process is small in friction resistance, is good in self-locking performance and steers accurately. The device can i