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There are numerous varieties of gears, and the most widespread classification approach is by equipment shaft. Typically, there are a few varieties of the parallel axis, cross-axis, and staggered axis. 1) Parallel shaft gears: like spur gears, helical gears, inside gears, racks, and helical racks, and so forth. 2) Cross shaft gears: straight bevel gears, spiral bevel gears, zero-degree bevel gears, and so on. 3) Staggered shaft gears: There are staggered shaft helical gears, worm gears, hypoid gears, and so on.
The tooth surface hardness, it is divided into comfortable tooth floor gear transmission and tough tooth floor equipment transmission. When the tooth surface hardness of the two wheels (or 1 of them) is less than or equal to 350HBW, it is referred to as comfortable tooth floor transmission when the tooth floor hardness of the two wheels is >350HBW, it is named hard tooth floor transmission. Soft-tooth floor equipment transmission is often employed for common low-velocity gear transmission that does not require substantial precision, and challenging-toothed floor gear transmission is often employed for gear transmission that demands robust bearing potential and compact construction.

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