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There are several sorts of gears, and the most common classification method is by gear shaft. Normally, there are a few varieties of the parallel axis, cross-axis, and staggered axis. 1) Parallel shaft gears: like spur gears, helical gears, inner gears, racks, and helical racks, and so on. 2) Cross shaft gears: straight bevel gears, spiral bevel gears, zero-diploma bevel gears, etc. 3) Staggered shaft gears: There are staggered shaft helical gears, worm gears, hypoid gears, etc.