Belt drive system

A belt drive system comprising:

• a drive source for generating torque;
• a drive pulley, drivingly connected to the drive source, for outputting the torque of the drive source;
• at least one driven unit for performing a specified action upon input of the torque;
• a driven pulley, connected to the driven unit, for inputting the torque to the driven unit;
• a joint, interposed between the driven pulley and the driven unit to transmit the torque of the driven pulley to the driven unit, for stopping the torque transmission when receiving a load equal to or over a predetermined value, and
• wherein a belt contact surface of the driven pulley is covered with rubber that has been transferred to the driven pulley from the drive belt as a result of slippage between the drive belt and the driven pulley occurring from an increase in the input of torque required to drive the driven unit such that a coefficient of friction between the drive belt and the driven pulley increases due to a transfer of material from said contact surface of the drive belt to the driven pulley, thereby applying a load on the joint equal to or over the predetermined value necessary to stop the transmission of torque to the driven unit, and
• wherein the rubber is alkylated chlorosulfonated polyethylene rubber, and the rubber contains 10 to 20 vol % carbon.