Classification of gear transmission （1）
1. Spur gear pair
The tooth line is the cylindrical gear pair of the indexing cylindrical surface generatrix. It is widely used in mechanical transmission, and the maximum power can reach 750kW.
2. Helical gear pair
A gear pair consisting of two helical cylindrical gears. The advantages are large overlap and smooth transmission. It is suitable for high speed. The disadvantage is that the axial force will be generated in the transmission, and it is generally not suitable for use as a sliding shift gear. The maximum transmission power is 5000kW.
Gear drives are also worthy of our attention as follows:
1. In the commonly used mechanical transmission, gear transmission efficiency is the highest, which can reach 99% transmission efficiency.
2. Compact structure, compared with belt drive and chain drive, the space required for gear rotation is generally smaller under the same conditions of use.
3. Compared with all kinds of transmission, gear transmission can work higher and has a long life.
4. The transmission ratio is stable, whether it is an average value or an instantaneous value. This is also one of the reasons why gear transmission is widely used.
5. Compared with belt drive and chain drive, the gear manufacturing and installation accuracy requirements are high, and the price is more expensive.
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