In the wonderful world of mechanical power transmission, gear drives employ a special and prominent place. This is actually the most preferred technology if you want to transmit significant power over a short distance with a constant velocity ratio. The system of equipment drives is very simple – the teeth, which are cut on the blanks of the gear wheel, mesh with each other to transmit power. 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. Actually, it can transmit power not merely between gear chain china parallel shafts, but also between nonparallel, co-planar, and intersecting etc. shafts.
