In the world of mechanical power transmission, gear drives have a very special and prominent place. This 
is the most preferred technology if you want to transmit considerable power over a brief distance with a continuous velocity ratio. The system of equipment drives is quite simple – one’s teeth, which are cut on the blanks of the gear wheel, mesh with one another to transmit power. In order 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. Actually, it can transmit power not merely between parallel shafts, but also between nonparallel, gear chain china co-planar, and intersecting etc. shafts.