Gear modification is a key technology to reduce vibration, noise and improve reliability of gear transmission system.Since the tooth profile modification was put forward in this year, domestic and foreign scholars have carried out extensive and in-depth theoretical research and experimental analysis on this technology, and put forward various theories and methods of tooth profile modification according to their understanding and practice.Gear profile modification includes two aspects: profile modification in the direction of tooth height and profile modification in the direction of tooth width, of which profile modification is the most widely used one.
Profile modification can effectively mitigate the sharp change of meshing rigidity caused by the change of meshing teeth, thus reducing the meshing impact and vibration and noise of gear transmission system.The main task of profile modification is to determine the three elements of profile modification: the amount, length and type of profile modification. The determination of these three factors is a complicated problem.Currently, research on tooth profile modification mainly focuses on two aspects: research on tooth profile modification based on static characteristics of gear transmission system and Research on tooth profile modification based on dynamic characteristics of gear transmission system.
In the research of tooth profile modification based on static characteristics of gear transmission system, analytical method or finite element software is generally used to analyze the influence of tooth profile modification on static transmission error, load distribution between teeth, bending and contact fatigue strength. This method can achieve better vibration reduction under quasi-static load.