Tooth shape error, tooth pitch error and tooth direction error in the manufacturing process are the main errors that cause transmission noise. It is also a problem that the gear transmission accuracy is difficult to guarantee.
For gears with small tooth profile errors and small tooth surface roughness, under the same test conditions, the noise is 10dB less than that of ordinary gears. Under the same test conditions, the noise level of gears with small pitch error is 6 ～ 12dB lower than that of ordinary gears. However, if there is a pitch error, the effect of the load on the gear noise will be reduced.
Tooth direction error will cause transmission power not to be transmitted at full tooth width. This end face or the end face of the steering tooth in the contact area, due to the local force, increases the deflection of the gear tooth, resulting in an increase in noise level. However, under high load, tooth deformation can partially compensate for tooth direction errors. The generation of gear noise is directly related to the transmission accuracy.
With the development of gear hard tooth surface technology, its large bearing capacity, small size, light weight, high transmission accuracy and other characteristics make its application field increasingly wide. However, the carburizing and hardening used to obtain the hard tooth surface deforms the gear, resulting in increased gear transmission noise and shortened life. In order to reduce noise, it is necessary to finish the tooth surface. At present, in addition to the traditional gear grinding method, a hard tooth surface scraping method has also been developed. By modifying the tooth top and root, or reducing the tooth shape of the main and driven wheels, the impact of gear engagement and engagement is reduced. , Thereby reducing gear transmission noise.
