上泽充通大学 Shanghai Jiao Tong University Basic Belt Drives2 .When transmitting power,the driving sheave rotates,friction causes driving sheave to grip the belt,increasing the tension on one side,called“tight side”(紧边)of drive. Opposite side of belt is still under tension,but at a smaller value,called“slack side”(松边)of drive. .The difference between the tensile forces of two sides in belt exerts a tangential force on the driven sheave and thus a torque is applied to the driven shaft via friction force. F2 Slack side Tight side Fy B2 F4 Basic Belt Drives2 •When transmitting power, the driving sheave rotates, friction causes driving sheave to grip the belt, increasing the tension on one side, called ―tight side‖ (紧边) of drive. •Opposite side of belt is still under tension, but at a smaller value, called ―slack side‖ (松边) of drive. •The difference between the tensile forces of two sides in belt exerts a tangential force on the driven sheave and thus a torque is applied to the driven shaft via friction force