According to the orientation of axes,gears are devided into 3 majoy categories:
1)Parallel Axes,including spur gear,helical gear,rack,internal gear.
2)Intersecting Axes,including miter gear,straight bevel gear,spiral bevel gear,spiral bevel gear.
3)Nonparallel,Nonintersectin Axes,including screw gear,worm,worm wheel.
4)Others,such as involute spline shaft & bushing, gear coupling,pawl & Ratchet.
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