上泽充通大学 Shanghai Jiao Tong University Basic Belt Drives2 Fo .A belt drive is a flexible power transmission element that seats tightly on a set of pulleys(带轮) >Sometimes called sheaves .When used for speed reduction,the smaller sheave is mounted on the high-speed shaft >e.g.shaft of an electric motor .Larger sheave is mounted on driven machine. .Belt is installed by placing it around the two sheaves while center distance between them is reduced. .Then the sheaves are moved apart placing the belt in high initial tension(初拉力). 33 Basic Belt Drives2 •A belt drive is a flexible power transmission element that seats tightly on a set of pulleys（带轮） Sometimes called sheaves •When used for speed reduction, the smaller sheave is mounted on the high-speed shaft e.g. shaft of an electric motor •Larger sheave is mounted on driven machine. •Belt is installed by placing it around the two sheaves while center distance between them is reduced. •Then the sheaves are moved apart placing the belt in high initial tension（初拉力）