What are the classifications of cylindrical gears?

Cylindrical gears are an important type of gears in mechanical gears, and they are also the most common type of gears. Cylindrical gears can be divided into straight gears, helical gears and herringbone gears according to the direction of the gear teeth.

The gear tooth profile is designed with tooth profile curve, pressure angle, tooth height and displacement. In terms of pressure angle, the load-bearing capacity of gears with low pressure angles is not as high as that of gears with high pressure angles. The tooth height of the gear is usually the standard tooth height. Cylindrical gears have been widely used in various mechanical equipment. In addition, gears can be divided into cylindrical gears, bevel gears, non-circular gears, racks and worm gears according to their shapes. According to the surface where the gear teeth are, there are external gears and internal gears. According to the manufacturing method, it can be divided into casting gears, cutting gears, rolling gears and sintered gears.

The material of the gear and the heat treatment method have an influence on the bearing capacity and size of the gear. According to hardness, tooth surface can be divided into soft tooth surface and hard tooth surface. Gears with soft tooth surfaces have low bearing capacity, but are easier to manufacture and have good running-in performance. It is mainly used for general-purpose machinery that has no strict restrictions on the size and weight of the transmission and has a small output. The bearing capacity of hard-tooth surface gears is higher. After the gear is cut, it is subjected to research quenching, surface quenching or carburizing quenching technology to improve its own hardness.

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