In the world of mechanical power transmission, gear drives have a very special and prominent place. This is actually the most preferred technology when you need to transmit significant power over a short distance with a constant velocity ratio. The gear chain china mechanism of equipment drives is quite simple – one's teeth, which are cut on the blanks of the apparatus wheel, mesh with each other to transmit power. To avoid slipping, the projections using 
one disc mesh with the recesses on other disc in equipment drives.
This technology uses different types of gears for power transmission. Actually, it could transmit power not only between parallel shafts, but also between nonparallel, co-planar, and intersecting etc. shafts.