TORSION VIBRATION DAMPER FOR KEEPING DAMPER NATURAL FREQUENCY CONSTANT BY PREVENTING A SPRING CONSTANT OF A RUBBER FROM BEING CHANGED REGARDLESS OF THE INCREASE AND DECREASE OF TEMPERATURE AND DAMPING TORSION VIBRATION OF A ROTARY SHAFT UNDER THE EXCESSIVE CHANGE OF THE TEMPERATURE

摘要

PURPOSE: A torsion vibration damper is provided to keep damper natural frequency by changing inertial moment of an outer ring in proportion to the change of a spring constant of a rubber varied according to temperature change or repressing the change of the spring constant. CONSTITUTION: A torsion vibration damper is composed of an inner ring(10) mounted to a rotary shaft; an outer ring(11) spaced from the inner ring; and a rubber(12) fixed between the inner and outer rings. The outer ring is formed into two layers comprising an inner metal(11a) with low thermal expansion ratio and an outer metal(11b) with high thermal expansion ratio. In addition, the outer ring has U-shaped protruded portions(13) facing each other. An intermediate ring is disposed between the inner ring and the rubber to form a space between the inner ring and the intermediate ring. The space is filled with wax. A passage and a space connected to the passage are arranged between the intermediate ring and the rubber.