Gear is to be able to mesh each other toothed machine part, it is in the field of mechanical transmission and the whole machinery is widely application of modern technology has reached the gear: 0.004 ~ 100 mm module of gear; Gear diameter by 1 mm ~ 150 m; On the transmitted power can reach hundreds of kilowatts; Speed up to hundreds of thousands of revolutions per minute; The circumference of the highest speed of 300 m/SEC
