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