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Steel wire cord reinforcing pneumatic tire

A technology of steel cords and pneumatic tires, applied in the field of carcass reinforcement, can solve problems such as increasing breaking load

Inactive Publication Date: 2016-06-08
NV BEKAERT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the breaking load of steel cord needs to be further improved

Method used

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  • Steel wire cord reinforcing pneumatic tire
  • Steel wire cord reinforcing pneumatic tire
  • Steel wire cord reinforcing pneumatic tire

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] A typical tire steel cord composition has a minimum carbon content of 0.65%, a manganese content ranging from 0.40% to 0.70%, a silicon content ranging from 0.15% to 0.30%, a maximum sulfur content of 0.03%, a maximum of 0.30% For the phosphorus content, all percentages are by weight. Only small amounts of copper, nickel and / or chromium. Typical tire steel cord components for high tensile steel cords have a minimum carbon content between 0.80 and 0.85% by weight. In order to further increase the tensile strength of the steel wire, the minimum carbon content may be in the range between 0.85 and 0.90 wt%, or even between 0.90 and 0.95 wt%. In addition, other alloying components such as Cr may be added.

[0022] The method for manufacturing steel wires of steel cords always starts from a wire rod with the steel composition mentioned above. The wire rods are first cleaned by mechanical descaling and / or by chemical pickling in H2SO4 or HCl solution in order to remove oxid...

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Abstract

A steel wire cord reinforcing a pneumatic tire comprises a core part, an intermediate layer and an external layer and is multi-layered. The core part is formed by four filaments; the intermediate layer is formed by 9 filaments; the external layer is formed by 14 filaments; at least one filament of the steel wire cord has tensile strength no less than (3800 to 2000d) MPa; the d represents the diameter of the filament; the filaments can be twisted in the same direction; and the proportion of the layer length of the intermediate layer and the layer length of the external layer is 0.70 to 0.90. By the use of the steel wire cord, great balance of the steel wire cord in tensile strength and rubber penetration can be achieved; and the steel wire cord can be manufactured and used with low cost.

Description

technical field [0001] The present invention relates to a steel cord for reinforcing a pneumatic tire, and also relates to the use of the steel cord for carcass reinforcement of a pneumatic tire. Background technique [0002] Steel cords for pneumatic tire reinforcement are known, as are multilayer steel cords for carcass reinforcement of pneumatic tires. The prior art US5595057A discloses a 3+9+15 cord for carcass reinforcement. In this cord, since the filaments surrounding the core are preformed according to the forming ratio, the structure of the cord is maintained without winding the wire. Abrasion between the filaments in the outer layer and the wrapping wire is thus avoided. But because the twist direction of the middle layer is opposite to that of the outer layer, the wear caused by the point contact between the wires in the middle layer and the wires in the outer layer still remains. Prior art US5318643A discloses a 27CC compact cord in which 27 filaments are twis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/06D07B3/08
CPCB60C9/0007D07B1/0633B60C2009/0085B60C2009/0092D07B1/0646D07B2201/2006D07B2201/2011D07B2201/2025D07B2201/203D07B2201/2031D07B2201/2032D07B2201/2061D07B2205/3035D07B2205/3089D07B2207/205D07B2207/209D07B2401/2055D07B2401/208B60C2009/0466B60C2009/0425D07B2801/12D07B2801/18D07B2801/90D07B2801/10
Inventor 张爱军郗海东王伟
Owner NV BEKAERT SA
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