Patent ID: 7393282

Claim:
A coupling structure of torque transmitting members for a shaft for coupling a pair of torque transmitting members interposed in a shaft, characterized in that: one of the torque transmitting members and the other of the torque transmitting members are adapted to transmit a torque through an elastic member and a pin; said one of the torque transmitting members has a pin insertion hole formed with a large diameter hole portion, a stepped receiving portion and a small diameter hole portion; said pin has a proximal portion and a distal portion, said proximal portion comprising a large diameter portion, a stepped portion and a small diameter portion which are respectively engaged with the large diameter hole portion, the stepped receiving portion and the small diameter hole portion of the pin insertion hole; and when torque to be transmitted is in a first range, the torque is transmitted through said elastic member and when torque to be transmitted is in a second range, said distal portion of said pin is brought into contact with a portion of said other of the torque transmitting members and the torque is transmitted through said pin, where said second range is higher than said first range.