| 摘要 |
PURPOSE:To improve adhesion and durability by coating Cu and Zn on the surface of a particular bead wire in turn, specifying the Cu and Zn content and the plating sticking quantity of brazen plating, and changing the Cu content within fixed limits. CONSTITUTION:A portion of a bead wire which is brought into contact with covering rubber has 0.50-6.0mm of a diamerter and is made of steel having 0.50-0.90wt.% of carbon content, and Cu and Zn are coated on the surface there of in this turn. Brass wherein a content ratio of Cu to Zn is 45/50-80/20 is pro vided, the thickness of brazing plating is set by 0.1-0.5mum and Cu content is partially changed from the surface to the depth direction. Moreover, the covering rubber is made by mixing 0.05-1.0 weight of one kind of organic acid cobalt salt, 40-140 weight of carbon black and 2.5-20 weight of sulfur to natural rubber with at least one kind of 100 weight of rubber such as natural rubber. |
