阅读说明：本技术 一种1+7股子午胎用钢丝帘线 (Steel wire cord for 1+ 7-ply radial tire ) 是由 刘祥 马卫铭 张正裕 苗为钢 王爱萍 冯国兵 周志嵩 刘湘慧 于 2020-04-27 设计创作，主要内容包括：本发明公开了一种1+7股子午胎用钢丝帘线,包括芯股股线钢丝和外层股股线钢丝,所述外层股股线钢丝沿圆周方向设于所述芯股股线钢丝的外部,所述芯股股线钢丝包括至少三根芯股第一层钢丝和至少九根芯股第二层钢丝编捻而成,所述外层股股线钢丝包括至少一根外层股第一层钢丝和至少六根外层股第二层钢丝编捻而成；本发明七股外层股股线钢丝之间的间隙较大,有利于橡胶充分渗入到芯股钢丝,避免了因没有渗入足够的橡胶导致各层钢丝之间的点接触摩擦,进而避免了钢丝帘线承载能力因磨损而失效的问题。(The invention discloses a steel wire cord for a 1+ 7-strand radial tire, which comprises a core strand steel wire and an outer strand steel wire, wherein the outer strand steel wire is arranged outside the core strand steel wire along the circumferential direction, the core strand steel wire comprises at least three core strand first layer steel wires and at least nine core strand second layer steel wires which are formed by weaving and twisting, and the outer strand steel wire comprises at least one outer strand first layer steel wire and at least six outer strand second layer steel wires which are formed by weaving and twisting; the gaps among the seven strands of outer strand steel wires are larger, which is beneficial to the rubber to fully permeate into the core strand steel wires, and avoids point contact friction among the steel wires of each layer caused by insufficient permeation of the rubber, thereby avoiding the problem of failure of the bearing capacity of the steel cord due to abrasion.)

1. The utility model provides a 1+7 strand steel cord for radial tire which characterized in that, includes core thigh strand wire steel wire (3) and outer thigh strand wire steel wire (5), outer thigh strand wire steel wire (5) are located along the circumferencial direction the outside of core thigh strand wire steel wire (3), core thigh strand wire (3) are twisted with fingers including at least three core thigh first layer steel wires (1) and at least nine core thigh second layer steel wires (2) and are formed, outer thigh strand wire (5) are twisted with fingers including at least one outer thigh first layer steel wire (7) and at least six outer thigh second layer steel wires (8) and are formed.

2. A multi-strand radial tire steel cord as claimed in claim 1, wherein said outer layer strand steel wires (5) are provided in at least seven groups, said outer layer strand steel wires (5) are twisted along the core strand steel wires (3) to form at least seven outer layer strand steel wires (5) uniformly twisted on one core strand steel wire (3).

3. A steel cord for a 1+7 ply radial tire according to claim 1 characterized in that the diameter of the core strand first layer steel filaments (1) is the same as that of the outer layer strand first layer steel filaments (7).

4. A steel cord for a 1+7 ply radial tire as claimed in claim 3, wherein the diameter of the core strand first layer steel wire (1) and the outer layer strand first layer steel wire (7) is in the range of 0.165 to 0.38 mm.

5. A steel cord for a 1+7 ply radial tire as claimed in claim 1, wherein said core strand steel wires (3) are twisted in the opposite direction to the steel wires in the outer layer strand steel wires (5).

6. A steel cord for a 1+7 ply radial tire according to claim 1 characterized in that said core strand second layer steel wires (2) have the same lay length as the outer layer strand second layer steel wires (8).

7. A steel cord for a 1+7 ply radial tire according to claim 1 characterized in that the lay length of the core strand first layer steel wires (1) is 0.5 times the lay length of the outer layer strand first layer steel wires (7).

8. A steel cord for a 1+7 ply radial tire according to claim 1, characterized in that the outer ply first layer steel wires (7) are free of braid.

Technical Field

The invention relates to a steel cord for a 1+ 7-ply radial tire, belonging to the technical field of steel cords.

Background

The steel cord is an important component in a radial engineering tire framework material, is formed by weaving and twisting a 7 multiplied by d +0.15HT structure steel cord commonly used by radial engineering tires, and is formed by a 7 multiplied by d core strand, six 7 multiplied by d outer layer strands and a 0.15mm outer winding wire, wherein the core strand and the outer layer strands are of the same structure, the diameters of steel wires are the same, the 7 multiplied by d structure twisting direction is S, the twisting pitch is 12.5mm, the six outer layer strands are Z, the twisting pitch is 20.0mm, the outer winding wire twisting direction is S, the twisting pitch is 5.0mm, the strands are arranged compactly, the gap between the outer layer strands is small, and rubber cannot effectively permeate into the core strand steel cord so that the air content in the cord is high. The structure of the steel cord and the strength, bending stiffness and adhesive property with rubber thereof have direct influence on the tire, and the defects caused by unreasonable structural design cannot be completely compensated only by controlling the production process of the steel cord. During the use of the radial tire, the problem of the failure of the bearing capacity of the cord is easily caused by the insufficient strength of the steel wire cord or the corrosion and abrasion of the steel wire.

Disclosure of Invention

The invention aims to provide a steel cord for a 1+ 7-ply radial tire, which aims to overcome the defects that the strength of the steel cord is insufficient, the gap between outer ply is small, and rubber cannot effectively permeate into steel wires of a core ply, so that the air content in the cord is high.

The utility model provides a 1+7 strand steel cord for radial tire, includes core thigh strand wire steel wire and outer strand wire steel wire, outer strand wire steel wire is located along the circumferencial direction the outside of core thigh strand wire steel wire, core thigh strand wire steel wire includes that three piece at least core thigh first layer steel wires and nine piece at least core thigh second floor steel wires are compiled and are twisted with fingers and form, outer strand wire steel wire includes that at least one outer strand first layer steel wire and six at least outer strand second floor steel wires are compiled and are twisted with fingers and form.

Preferably, the outer layer strand steel wires are at least provided with seven groups, the outer layer strand steel wires are twisted along the core strand steel wires to form at least seven outer layer strand steel wires which are uniformly twisted on one core strand steel wire.

Preferably, the diameter of the first layer of steel filaments of the core strand is the same as the diameter of the first layer of steel filaments of the outer layer strand.

Preferably, the diameter of the first layer of steel wires of the core strand and the diameter of the first layer of steel wires of the outer layer strand are in the range of 0.165-0.38 mm.

Preferably, the core strand steel filaments are twisted in the opposite direction to the steel filaments in the outer layer strand steel filaments.

Preferably, the second layer of steel wires of the core strand has the same lay length as the second layer of steel wires of the outer layer strand.

Preferably, the lay length of the first layer of steel wires of the core strand is 0.5 times of the lay length of the first layer of steel wires of the outer layer strand.

Preferably, the outer ply first layer steel wires are free of braid.

Compared with the prior art, the invention has the following beneficial effects: (1) the gaps among the seven strands of outer strand steel wires are larger, so that rubber can be fully infiltrated into the core strand steel wires, point contact friction among the steel wires of all layers due to insufficient infiltration of rubber is avoided, and the problem that the bearing capacity of a steel cord is failed due to abrasion is further avoided;

(2) the invention improves the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the tire, and prolongs the service life of the tire.

Drawings

FIG. 1 is a schematic cross-sectional view of a steel cord for a multi-ply radial tire of the present invention;

fig. 2 is a schematic cross-sectional view of a steel cord commonly used in the prior art.

In the figure: 1. a core strand first layer of steel filaments; 2. a core strand second layer of steel filaments; 3. core strand steel wire; 5. outer ply strand wire; 7. the outer layer strands form first layer steel wires; 8. the outer ply is the second layer of steel filaments.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1, a steel cord for a 1+7 ply radial tire is formed by twisting a core strand steel wire 3 and seven outer strand steel wires 5, the cross section of the steel cord is circular, the seven outer strand steel wires 5 are twisted around the core strand steel wire 3, and a structure that the seven outer strand steel wires 5 are uniformly twisted around the core strand steel wire 3 is formed. The core strand steel wire 3 is formed by weaving and twisting three core strand first layer steel wires 1 and nine core strand second layer steel wires 2, and the nine core strand second layer steel wires 2 are woven and twisted around the three core strand first layer steel wires 1; the outer layer strand steel wire 5 is formed by weaving and twisting an outer layer strand first layer steel wire 7 and six outer layer strand second layer steel wires 8; the diameter of the first layer of steel wires 1 of the core strand is the same as that of the first layer of steel wires 7 of the outer layer strand, and the diameter range is 0.165-0.38 mm. The twisting directions of the steel wires in the core strand steel wire 3 and the outer layer strand steel wire 5 are opposite; the second layer of steel wire 2 of core thigh is the same with 8 lay lengths of outer layer thigh second layer steel wire, and the lay length of the first layer of steel wire 1 of core thigh is 0.5 times of the lay length of the first layer of steel wire 7 of outer layer thigh, and first layer steel wire a1 does not have the weaving and twisting in the outer layer thigh steel wire 5.

The invention overcomes the defects caused by unreasonable structural design of the steel cord by changing the structure of the steel cord, improves the strength, the glue permeability, the shock resistance and the fatigue resistance of the steel cord, reduces the air content between the steel cord strands of the tire, improves the strength grade of the tire cord and prolongs the service life of the tire.

In the present embodiment, the strength grades of the steel wires in the core strand steel wire 3 and the outer layer strand steel wire 5 are normal strength NT, high strength HT, ultra-high strength ST, ultra-high strength UT, or ultra-high strength MT; the invention is suitable for weaving and twisting steel wires with different strength grades of common strength NT, high strength HT, ultrahigh strength ST, ultrahigh strength UT or ultrahigh strength MT, and can improve the strength requirement, the glue permeation performance, the impact resistance and the fatigue resistance of the steel wire cord formed by weaving and twisting.