In the wonderful world of mechanical power transmission, gear drives have a very special and prominent place. This is gear chain china actually the the majority of preferred technology when you need to transmit significant power over a short distance with a constant velocity ratio. The system 
of gear drives is very simple – the teeth, which are cut on the blanks of the apparatus wheel, mesh with each other to transmit power. In order to avoid slipping, the projections using one disc mesh with the recesses on other disc in gear drives.
This technology uses various kinds of gears for power transmission. In fact, it could transmit power not only between parallel shafts, but also between nonparallel, co-planar, and intersecting etc. shafts.