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The tooth profile of automobile gear includes tooth profile curve, pressure Angle, tooth height and displacement. Involute automotive gears are relatively easy to manufacture, so in the gears used in modern times, involute gears account for the majority, while cycloidal gears and arc gears of automotive gears are used less. In addition, automobile gear can also be divided into cylindrical gear, bevel gear, non-circular gear, rack, worm gear according to its shape; According to the shape of the tooth line, the automobile gear is divided into spur gear, helical gear, herringbone gear, curve gear; According to the surface of the gear teeth are divided into external gear and internal gear; According to the manufacturing method, it can be divided into casting gear, cutting gear, rolling gear, sintering gear, etc.
