POWER TRANSMISSION STRUCTURE

摘要

PROBLEM TO BE SOLVED: To avoid an adverse effect to a drive source suffering from overload torque caused to an associated driven apparatus in a power transmission structure, by cutting off the torque properly with a predetermined level. SOLUTION: A pulley 9 as a driving-force transmission body is connected for power transmission to a bushing 11 as a driving-force bearing body with a first breakable wire 13 and a second breakable wire 14. Behind the first wire 13 at a predetermined interval in the rotating direction of the pulley 9, a pin 9d as a breaking promoting member is erected. When the pulley 9 receives overload torque caused by abnormality in an associated driven apparatus, the pin 9d bites into the first wire 13 to bend it and break it immediately. As a result, the second wire 14 can not bear the entire overload torque and then breaks just after the break of the first wire 13.