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Classification and Design of Gear Shafts

Pulished on Mar. 24, 2021

Gear Shaft refers to a mechanical part that supports a rotating part and rotates with it to transmit motion, torque or bending moment. It is generally in the shape of a metal round rod, and each section can have different diameters. The rotating parts of the machine are mounted on the shaft.

The gear shaft mainly bears alternating load, impact load, shear stress and contact stress. The shaft is prone to cracks and the teeth are prone to wear. Therefore, the core of the gear shaft is required to have a certain degree of strength and toughness, a higher fatigue limit and the ability to resist multiple impacts. The surface should also have a certain degree of hardness and wear resistance.




According to the shape of the axis, the shaft can be divided into two types: Crankshaft and straight shaft.

According to the bearing condition of the shaft, it can be divided into:

① The rotating shaft, which bears both bending moment and torque during work, is the most common shaft in machinery, such as the shaft in various reducers.

②The mandrel is used to support the rotating parts and only bear the bending moment and not transmit the torque. Some mandrels rotate, such as the axle of railway vehicles, and some mandrels do not rotate, such as the axle supporting the pulley.

③The Drive Shaft is mainly used to transmit torque without bearing the bending moment, such as the long optical shaft in the moving mechanism of the crane, the drive shaft of the automobile, etc.


In the design, the use of gear shafts is generally nothing more than the following situations:

1. The gear shaft is generally a pinion (a gear with a small number of teeth)

2. The gear shaft is generally in the high-speed level (that is, the low-torque level)

3. Gear shafts are generally seldom used as sliding gears for variable speeds, and are generally fixed-running gears. First, because they are in the high-speed stage, their high speeds are not suitable for sliding speed.

4. The gear shaft is a combination of shaft and gear. However, in the design, the length of the shaft should be shortened as much as possible. If it is too long, it is not conducive to the upper hobbing machine. The second is that the support of the shaft is too long and the shaft should be thickened And increase the mechanical strength

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