| 摘要 |
PURPOSE:To improve the shock resistance of a side wall by applying rubber material having specially fixed physical properties to the side wall. CONSTITUTION:A rubber material having physical properties not less than 0.80 Mpa in loss elasticity modulus and not less than 130kg/cm<2> in tensile strength is applied to a side wall 2. In this case, the loss elasticity modulus was measured with a viscoelastic spectrum meter under the conditions that the temperature was 20 deg.C, the dynamic amplitude, plus or minus 2% and the frequency, 20Hz. By this formation, it is made possible to improve the shock resistance of the side wall 2. |
