三马致力于打造优质传动设备蜗轮蜗杆

Conditions for use of worm drive

1., self locking. The spiral angle of the worm is very small. The worm can only drive the worm wheel, but the worm wheel can not drive the worm to rotate. 2. the transmission ratio is large and the structure is compact. The number of worm heads is expressed in Z1 (general Z1=1~4), and the number of worm gears is expressed by Z2. From the transmission ratio formula I = Z2 / Z1, it can be seen that when Z1 = 1, that is, the worm is a single head, the worm has to rotate Z2 worm gear before turning a turn, so can get a large transmission ratio, generally in power transmission, take the transmission ratio I = 10 - 80; in the indexing mechanism, I can reach 1000. Such a large transmission, such as gear transmission, it needs to adopt multi-stage transmission, so the worm transmission structure is compact, small size, light weight. 3. smooth transmission and no noise. Because the worm tooth is a continuous and uninterrupted spiral tooth, it is continuous when meshing with the worm gear, the worm tooth does not enter and withdraw from the meshing process, so the work is stable, impact, vibration, noise is small. Worm drive. 4. the heat is large, the tooth surface is easy to wear, and the cost is high. 5. worm drive efficiency is low. Generally speaking, worm drive efficiency is lower than gear transmission. In particular, the worm drive with self locking performance is less than 0.5, and the general efficiency is only 0.7 to 0.9.