Classification and main categories of slient chain and Hy-Vo silent chain are introduced.Multivariant variation characteristic and development trend of Hy-Vo slient chain are analyzed.Multivariant variation design method based on meshing mechanism and transmission characteristic variation is an important method to realize innovation and upgrading of Hy-Vo silent chain

and it is also an important means to implement intellectual property and core technology protection of Hy-Vo silent chain.