TORQUE ROD BUSH

PURPOSE:To selectively vary the elasticity of a torque rod bush by selectively rotate an eccentric part of a rotor of an ultrasonic motor to selectively add the elasticity of second rubber bushes to the elasticity of a first rubber bush. CONSTITUTION:A first inner cylinder 1, an ultrasonic motor which is provided with a rotor 12 where the outer diameter is continuously changed and an eccentric part slidable in the radial direction is provided, and mounted on the outer circumferential surface of the first inner cylinder 1, and second inner cylinders 2, 3 to position a disk spring 8 of this ultrasonic motor and a thrust bearing 13 are provided. In addition, first rubber bushes 4, 5 fixed to the outer circumferential surface of these second inner cylinders 2, 3, an outer cylinder 7, and a second rubber bush 6 where the thickness is continuously or uncontinuously changed on the inner surface of this outer cylinder 7 and which is fixed opposite to the eccentric part of the rotor 12 of the ultrasonic motor 18 are provided.