Structural features of worm gear reducer:
It can obtain a large transmission ratio and is more compact than the staggered shaft helical gear mechanism.
The meshing tooth surfaces of the two wheels are in line contact, and its bearing capacity is much higher than that of the staggered shaft helical gear mechanism.
Worm transmission is equivalent to screw transmission, which is multi tooth meshing transmission, so it has stable transmission, low noise and self-locking.
When the lead angle of the worm is less than the equivalent friction angle between the meshing teeth, the mechanism has self-locking and can realize reverse self-locking, that is, the worm wheel can only be driven by the worm, but not by the worm wheel. Such as the self-locking worm mechanism used in its heavy machine, its reverse self-locking can play a role in safety protection
Low transmission efficiency and serious wear. In worm gear meshing transmission, the relative sliding speed between meshing teeth is large, so the friction loss is large and the efficiency is low. On the other hand, the relative sliding speed causes serious wear and heating of the tooth surface. In order to dissipate heat and reduce wear, expensive materials with good antifriction and wear resistance and good lubrication devices are often used, so the cost is high and the axial force of the worm is large.
