In the world of mechanical power transmission, gear drives employ a special and prominent place. This is actually the the majority of preferred technology when you need to transmit substantial power over a short distance with a gear chain china constant velocity ratio. The system of equipment drives is quite simple – one’s teeth, which are cut on the blanks of the apparatus wheel, mesh with one another to transmit power. To avoid slipping, the projections using one disc mesh with the recesses on various other disc in equipment drives.
This technology uses various kinds of gears for power transmission. In fact, it can transmit power not only between parallel shafts, but also between non-parallel, co-planar, and intersecting etc. 
shafts.