| 摘要 |
PURPOSE:To suppress the road noise to the min. and improve the noise suppressing performance, residence performance, etc. by constituting the characteristics of the tread rubber for pneumatic tire so that the relation between the dynamic modulus and the loss tangent fulfills a specific equation. CONSTITUTION:The characteristics of the tread rubber for pneumatic tire is constituted so that the relation between the dynamic modulus E*(kgf/cm<2>) and the loss tangent tandelta fulfills the equation E*Xtandelta=20-70. The preferable state is constituted when the ratio (a) between E* and tandelta fulfills the equation (a)= E*/tandelta=100-350. The dynamic modulus E* taking account of viscoelastic properties is suitably adopted, when the hardness of a tire on traveling is discussed, with the representative value of vibration in the case when the minute unevenness of a road deforms a tire tread as 20Hz. Further, the damping performance is represented by using the loss tangent tandelta as the ratio between the dynamic modulus and the loss modulus as described above. |
