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

There are many types of gear transmission, which can be divided into different types according to different classification methods.

1. By gear ratio

According to whether the transmission ratio of a pair of gear transmissions is constant, it can be divided into fixed transmission ratio and variable transmission ratio gear transmission. The gears in the variable transmission ratio gear transmission mechanism are generally non-circular, so it is also called non-circular gear transmission, which is mainly used in some machinery with special requirements. The gears in the fixed transmission ratio gear transmission mechanism are all circular, so it is also called circular gear transmission.

There are many types of fixed transmission ratio gear transmission. According to whether the main and driven wheel rotation axes are parallel, it can be divided into two categories, namely plane gear transmission and space gear transmission.

2. According to tooth profile shape

According to the shape of the tooth profile curve, it can be divided into involute gear transmission, cycloidal gear transmission, arc gear transmission and parabolic gear transmission. Among them, involute gear transmission is the most widely used.

3. According to working conditions

According to different working conditions of gear transmission, it can be divided into closed gear transmission, open gear transmission and semi-open gear transmission. In the open gear transmission, the gear teeth are exposed, and the dust is easy to fall on the tooth surface; in the closed gear transmission, the gear teeth are enclosed in the box, which can ensure good working conditions and is widely used; the semi-open gear transmission is higher than the open gear transmission. Better, the big gear is partially immersed in the oil sump and has a simple protective cover, but there are still foreign objects intruding.

4. By tooth surface hardness

According to the hardness of the tooth surface, it is divided into soft tooth surface gear transmission and hard tooth surface gear transmission. When the tooth surface hardness of two wheels (or one of them) is less than or equal to 350HBW, it is called soft tooth surface transmission; when the tooth surface hardness of both wheels is >350HBW, it is called hard tooth surface transmission. Soft-tooth surface gear transmission is often used for general medium and low-speed gear transmissions that do not require high precision, and hard-toothed surface gear transmission is often used for gear transmissions that require strong bearing capacity and compact structure.

Although there are many types of gear transmissions, the involute spur gear transmission is the simplest and most basic type.

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