What are the characteristics of worm gear transmission?

1. It can get a large transmission ratio, which is more compact than the staggered axis helical gear mechanism.

2. The meshing tooth surfaces of the two wheels are in line contact, and its load-bearing capacity is much higher than that of the staggered axis helical gear mechanism.

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 small.

4. It has self-locking properties. When the lead angle of the worm is less than the equivalent friction angle between the meshing gear teeth, the mechanism has self-locking properties and can achieve reverse self-locking, that is, the worm can only drive the worm wheel, but not the worm wheel. For example, the self-locking worm mechanism used in lifting machinery can play a safety protection role in its reverse self-locking property.

5. The transmission efficiency is low and the wear is serious. When the worm gear meshes, the relative sliding speed between the meshing gear teeth is large, so the friction loss is large and the efficiency is low. On the other hand, the large relative sliding speed causes serious wear and heat generation on the tooth surface. In order to dissipate heat and reduce wear, more expensive materials with good friction reduction and wear resistance and good lubrication devices are often used, so the cost is high.
6. The axial force of the worm is large.