| 摘要 |
<p>PURPOSE: To effectively suppress generation of a crack caused by distorted deformation, twisted deformation, and flow deformation due to a charged internal pressure when a load is rotated and to surely improve durability of a bead part. CONSTITUTION: The third stiffener 33 with low rubber hardness is arranged in the outside part in the radius direction of a stiffener 30 so as to absorb and reduce distorted deformation and twisted deformation in a side wall part 35 in the middle of transmission, and deflection in the vicinity of an outside end 36 in the radius direction is reduced, while the first and the second stiffeners 31 with comparatively high rubber hardness are arranged in the inside and in the central part in the radius direction of the stiffener 30 individually, so that flow deformation to the outside in the radius direction of rubber between a folded part, 26 and a main body part, 25 is reduced.</p> |
