Gear; rim have teeth can be continuous mesh transfer movement and power, mechanical components, machine parts can be meshing teeth. The diameter of the big gear is one of the times of the diameter of the pinion. If the big gear is fixed, the pinion gear along an orbit, a small gear rotation of a few weeks? Conversely, if the small gear is fixed, the large gear pinion along an orbit, the large gear rotation of a few weeks? Large gear is fixed, small gear along the gear revolution a week, small gear rotation a week; when the small gear is fixed, large gear along the small gear revolution a week, big gear rotation a week and a half, namely in 240 DEG position rotation a week, 360 DEG position rotation a week and a half, 480 DEG position rotation for two weeks, 720 DEG position rotation three weeks.
