| 摘要 |
PROBLEM TO BE SOLVED: To stabilize cutoff torque for use at an overload in despite of a wide range of environmental temperature changes. SOLUTION: This power transmission device comprises a frictional engagement mechanism 7a, 11a, 13 to 16 for engaging a driving rotary member 1, 10, 11, 12 and a driven rotary member 7 with each other with frictional force. The frictional engagement mechanism uses an intermediate friction member 13 of graphite adapted to shear fracture when the transmission torque between both those rotary members reaches a set value. During normal operations of a compressor 4, this intermediate friction member 13 of the frictional engagement mechanism transmits the rotation of the driving rotary member 1, 10, 11, 12 to the driven rotary member 7. During overloaded operations of the compressor 4, meanwhile, this intermediate friction member 13 shears into fracture to set the driving rotary member 1, 10, 11, 12 idling. |
