Taper bush is connected with the inner cone of the belt pulley, sprocket and other transmission parts by the outer cone of 8 degrees, so that the centering accuracy of various transmission parts is greatly improved. The size of the taper bush is the standard design of the series. The inner keyway is machined according to ISO standard. Versatility is very good interchangeability, suitable for various occasions. When the transmission parts run for a long time, the inner hole and chain slot may be damaged, if it is the use of the transmission parts of the taper bush, when this happens, just replace the same specification cone sleeve can be restored to use. Thus greatly improve the service life of transmission parts, reduce maintenance costs, save time.