Transmission gear refers to a device that transmits motion and power by a gear pair. It is the most widely used mechanical transmission method in various modern equipment. Its transmission is relatively accurate, high in efficiency, compact in structure, reliable in operation, and long in life.

Application of transmission gear in daily life

Gears are used in daily life: automobiles, clocks, elevators, mechanical watches, automobiles, variable speed bicycles, noodle machines, juicers, food processors, egg beaters, water meters, gas meters, sewing machines, CD players, wine corkscrews Appliances, clocks, car gearboxes, swing heads of electric fans, washing machines, alarm clocks, etc.

There are gears on the rim that continuously mesh with mechanical elements that transmit motion and power. The application of gears in transmission appeared very early. At the end of the 19th century, the principle of generative gear cutting method and special machine tools and cutting tools using this principle appeared one after another. With the development of production, the stability of gear operation was paid more attention to.

In terms of pressure angle, gears with small pressure angles have a smaller load-carrying capacity; gears with large pressure angles have a higher load-carrying capacity, but the load on the bearing increases under the same transmission torque, so it is only used in special cases. The tooth height of the gear has been standardized, and the standard tooth height is generally adopted. There are many advantages of shifting gears, which have been widely used in various mechanical equipment.

The manufacturing material and heat treatment process of the gear has a great influence on the load-carrying capacity and dimensional weight of the gear. Before the 1950s, carbon steel was mostly used for gears, alloy steel was used in the 1960s, and case-hardened steel was mostly used in the 1970s. According to the hardness, the tooth surface can be divided into soft tooth surface and hard tooth surface.
The gear bearing capacity of the soft tooth surface is low, but it is easier to manufacture and has good running-in performance. It is mostly used in general machinery with no strict restrictions on transmission size and weight and small-scale production. Because the small wheel bears the heavier burden among the paired gears, in order to make the working life of the large and small gears roughly equal, the hardness of the tooth surface of the small wheel is generally higher than that of the large wheel.

Hardened gears have a high load-carrying capacity. After the gears are cut, they are quenched, surface quenched, or carburized and quenched to increase the hardness. But in the heat treatment, the gear will inevitably be deformed, so grinding, grinding or fine cutting must be carried out after the heat treatment to eliminate the error caused by the deformation and improve the precision of the gear.

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