1. It can achieve a large transmission ratio and has a more compact structure than helical gears with interwoven shafts. 

2. The meshing teeth of the two wheels are in linear contact, and their load-bearing capacity is much higher than that of the helical gear structure of the interweaving shaft. 

3. Worm gear transmission is equivalent to spiral transmission, which is a multi tooth meshing transmission, so the transmission is smooth and the noise is very low. 

4. It has self-locking properties. When the lead angle of the worm is less than the equivalent conflict angle between the meshing teeth, the organization has self-locking properties and can achieve reverse self-locking, that is, only the worm can drive the worm wheel, not the worm wheel. The Yage worm gear represents a self-locking worm structure used in its heavy machinery, and its reverse self-locking ability can provide a safety maintenance effect. 

5. The transmission power is low and the wear is severe. When the worm gear is engaged in transmission, the relative sliding speed between the meshing teeth is high, resulting in high conflict losses and low power. On the other hand, due to the high relative sliding speed, tooth surface wear and heat generation are severe. In order to dissipate heat and reduce wear, expensive materials with good anti friction and anti-wear properties, as well as good lubrication equipment, are often used, resulting in higher costs. 

6. The axial force of the worm is relatively large.