The worm drive is a transmission that transmits motion and power between two axes that are interlaced in space.
The angle between the two axes can be any value, and is usually 90°.
The worm drive is used to transfer motion and power between the staggered axes.
There is only one spiral on the worm called a single-head worm, that is, the worm turns one turn and the turbine turns over one tooth.
If there are two spirals on the worm, it is called double-headed worm, that is, the worm rotates one turn, and the turbine rotates two teeth.
- Large transmission ratio, compact structure, small size and light weight.
- The drive is smooth and noise-free.
Because the worm tooth is a continuous uninterrupted helical tooth, it is continuous with the worm gear teeth.
The worm teeth do not enter and exit the meshing process, so the work is smooth, and the impact, vibration, and noise are relatively small.
When the worm’s helix angle is small, the worm can only drive the worm gear, and the worm wheel can’t drive the worm to rotate.
- Worm transmission efficiency is low.
It is generally believed that the efficiency of the worm drive is lower than that of the gear drive.
In particular, the self-locking worm drive has an efficiency of less than 0.5 and a general efficiency of only 0.7 to 0.9.
- The heat is large, the tooth surface is easy to wear and the cost is high.
According to the shape of the worm can be divided:
- Cylindrical worm drive
- Toroidal worm drive
- Cone worm drive