Equipment Gear Classification Introduction

2020-12-14


Equipment Gear Gears can be classified by tooth profile, gear profile, tooth line shape, surface on which gear teeth are located, and manufacturing method. The tooth profile of the gear includes tooth profile curve, pressure angle, tooth height and displacement. Involute gears are relatively easy to manufacture, so in modern equipment gears, involute gears account for an absolute majority, while cycloid gears and arc gears are less used. Let's take a look at the introduction of equipment gear classification.

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1. In terms of pressure angle, gears with smaller pressure angles have smaller load-bearing capacity. A gear with a large pressure angle has a higher load-bearing capacity, but the load on the bearing will increase under the same transmission torque, so it is only used in special cases. The tooth height of the equipment gear has been standardized, and the standard tooth height is usually adopted. Displacement gears have many advantages and have been used in various mechanical devices.
2. In addition, equipment gears can also be divided into cylindrical gears, bevel gears, non-circular gears, racks and worm gears according to their shapes. According to the shape of the tooth line, it can be divided into spur gear, helical gear, herringtooth gear and curve gear. According to the surface of the gear teeth, it is divided into external gear and internal gear. According to the manufacturing method, it can be divided into cast gears, cut gears, rolled gears and sintered gears.
3. The manufacturing material and heat treatment process of the equipment gear have a great influence on the carrying capacity, size and weight of the equipment gear. Before the 1950 s, carbon steel was mainly used for gears, alloy steel was used in the 1960 s, and case hardened steel was used in the 1970 s. According to the hardness, the tooth surface can be divided into two types: soft tooth surface and hard tooth surface.

equipment gears with soft tooth surfaces have lower load capacity, but they are easy to manufacture and have good running-in performance. They are mainly used for general-purpose machinery, and there are no strict restrictions on the size and weight of the transmission device and small batch production. Because the pinion has a heavy burden between the mating gears, the hardness of the tooth surface of the pinion is generally higher than the hardness of the tooth surface of the large gear in order to make the operating life of the large gear and the pinion gear approximately equal.



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