In the wonderful world of mechanical power transmission, engrenagem drives employ a special and prominent place. This is actually the many preferred technology if you want to 
transmit considerable power over a short distance with a constant velocity ratio. The mechanism of gear drives is pretty simple – one's teeth, which are cut on the gear chain china 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 other disc in gear 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 nonparallel, co-planar, and intersecting etc. shafts.
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