If we know the rotation direction of the worm gear, to judge the rotation direction of the worm, it is necessary to extend the right hand or left hand, half clenched fist, so that the thumb points to the opposite direction of the linear speed of the worm gear meshing point, at this time, if the other four fingers of the right hand point the direction of the worm rotation is the same, then the worm should be right-handed, if the same as the left hand, then the worm should be left-handed.

And many things known worm rotation and rotation direction, the method of judging the rotation direction of worm gear is: when the worm is right-handed, stretch out the right hand, half made a fist, with the other four fingers except thumb to the direction of rotation of the worm, at this time, and thumb pointing to the opposite direction is the worm gear in the meshing point of the linear speed direction, thus know the direction of rotation of the worm gear. When the worm is left rotated, extend your left hand.

In the known rotation of the worm and the rotation direction of the worm gear, to judge the rotation direction of the worm: when the right worm, stretch out the right hand, half a fist, so that the thumb points to the worm gear in the opposite direction of the linear speed, at this time, the direction of the other four fingers is the direction of rotation of the worm. When the worm is left, extend the left hand, the judgment method is the same as above.

Worm gear has good self - locking performance, very useful in mechanical applications, such as winch, conveying equipment and so on. However, because of the friction transmission mode of turbo worm, the transmission efficiency of worm gear is much lower than that of gear transmission.

In the transmission mode of reducer, worm gear drive has the characteristics that other gear drives do not have, that is, the worm can easily turn the worm gear, but the worm gear can not turn the worm. This is because the structure and transmission of the worm gear is achieved by friction.