In the world of mechanical power 
transmission, gear drives have a very special and prominent place. This is the the majority of preferred technology when you need to transmit substantial power over a brief distance with a gear chain china continuous 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. In order to avoid slipping, the projections using one disc mesh with the recesses on additional disc in equipment drives.
This technology uses different types of gears for power transmission. In fact, it could transmit power not merely between parallel shafts, but also between non-parallel, co-planar, and intersecting etc. shafts.