| 摘要 |
PURPOSE:To let the static electricity of a car body to easily flow to a road surface by setting the volume specific resistance of rim cushion rubber and sidewall rubber of the portion directly contacting with a rim under a specific value. CONSTITUTION:The volume specific resistance of the portion B directly contacting with a rim 8 of rim cushion rubber 7 and sidewall rubber 6 is set under 5X10<4>OMEGA.cm. Therefore, the rubber composition of rim cushion rubber 7 is constituted by blending, for example, conductive carbon of 40pts.wt. or more and zinc white of 2-10pts.wt. to natural rubber of 100pts.wt. Further, the rubber composition which is obtained by blending conductive carbon of 20-60pts.wt. and zinc white of 2-10pts.wt. to natural rubber of 100pts.wt. is used in the sidewall rubber 6. By this constitution, it is possible to easily transmit the static electricity generated in a car body to a road surface. |
