Power transmission mechanism

摘要

A power transmission mechanism has a first rotary body, a second rotary body and an elastic body. The second rotary body is located coaxially with the first rotary body. The first rotary body is operatively connected to the second rotary body through the elastic body for transmitting torque. The elastic body has a plurality of elastic members so as to stepwise change an elastic coefficient of the elastic body in accordance with the value of the torque.