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 
significant power over a brief distance with a continuous velocity ratio. The mechanism of equipment drives is fairly 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 on one disc mesh with the recesses on additional disc in gear drives.
This technology uses gear chain china different types of gears for power transmission. Actually, it could transmit power not only between parallel shafts, but also between nonparallel, co-planar, and intersecting etc. shafts.