Steel cord structure for all-steel truck radial tire

Abstract

The utility model relates to the technical field of steel cords, in particular to a steel cord structure for an all-steel truck radial tire, which is formed by twisting four monofilaments once in the S direction or the Z direction. Wherein in the cross section of the steel cord, the four monofilaments are distributed in a rectangular shape, the direction of the first edge of the rectangle is defined as the first direction, the direction of the second edge of the rectangle is defined as the second direction, the first edge and the second edge are two adjacent edges, and gaps are formed between the monofilaments in the first direction and the second direction; the steel cord formed by the four monofilaments is formed by twisting the four monofilaments at a time, the section of the steel wire is rectangular, gaps between the monofilaments are large, the rubber permeation performance is good, the steel wire is used in a radial tire belted layer, the monofilaments are large in diameter, the twisted cord is large in rigidity, and the strength and rigidity of a framework material can help a tire to keep the shape; the weight of a vehicle and the force of a road surface can be borne.

Description

Technical Field

[0001] The utility model relates to the technical field of steel cords, in particular to a steel cord structure for an all-steel load-bearing radial tire. Background Art

[0002] As all-steel radial truck tires develop towards lightweight, steel cords with simple structure, high strength and good rubber permeability gradually replace traditional steel cords and become an important technical direction for radial tire skeleton materials. The belt layer is a key component of all-steel radial truck tires, bearing more than 55% of the tire stress, and its material properties are one of the important factors that determine the comprehensive performance of the tire.

[0003] In the past, the steel cord samples used in tire belt structures were double-layer structures of 3+8, 2+7 or 1+6, which are relatively complex and compact structures with large cord diameter and line density, which increased the weight of the tire, and the cord's adhesive penetration performance was poor. Utility Model Content

[0004] In view of the technical problems and requirements of steel cords in the prior art, the first aspect of the utility model proposes a steel cord structure for a full-steel load-bearing radial tire, which is formed by twisting four monofilaments at one time, and the twist direction is S direction or Z direction;

[0005] Wherein, in the cross section of the steel cord, the four monofilaments are distributed in a rectangular shape, the direction along the first side of the rectangle is defined as the first direction, the direction along the second side is defined as the second direction, and the first side and the second side are two adjacent sides;

[0006] The spacing between the monofilaments along the first direction is L1, and the spacing between the monofilaments along the second direction is L2, L1 = 0.06-0.12 mm, L2 = 0.06-0.12 mm.

[0007] Preferably, the diameter d1 of the monofilament is 0.37 mm to 0.39 mm.

[0008] Preferably, the diameter d1 of the monofilament is 0.38 mm.

[0009] Preferably, the spacing between the monofilaments along the first direction is L1=0.09 mm, and the spacing between the monofilaments along the second direction is L2=0.09 mm.

[0010] Preferably, the twist length of the monofilament is 27 to 30 mm.

[0011] Preferably, the diameter of the steel cord structure is 0.80-0.90 mm.

[0012] Preferably, the linear density of the steel cord structure is 3.5 to 3.7 g / m.

[0013] Preferably, the breaking force of the steel cord structure is above 1545 N, and the strength of the single wire is above 3600 Mpa.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] The ultra-high tensile open cord (UTOC) steel cord proposed in this application, which is composed of 4 single wires, is formed by twisting 4 single wires at one time. The cross-section of the steel wire is rectangular, and the gap between single wires is large, with good rubber penetration performance. When used in the belt layer of a radial tire, due to the thick diameter of the single wire, the stiffness of the twisted cord is large, and the strength and stiffness of the skeleton material can help the tire maintain its shape, enabling it to withstand the weight of the vehicle and the forces of the road surface. Description of the Drawings

[0016] The drawings are not intended to be drawn to scale. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of example and with reference to the drawings, wherein:

[0017] Figure 1 is a schematic diagram of the steel cord structure for all-steel radial truck tires shown in the present utility model. Detailed Embodiments

[0018] In order to better understand the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0019] As Figure 1 shown, a steel cord structure 10 for all-steel radial truck tires is proposed in the first aspect of the present utility model, which is formed by twisting four single wires 1 at one time, and the twisting direction during twisting is the S direction or the Z direction.

[0020] Among them, within the cross-section of the steel cord structure 10, the four single wires 1 are distributed in a rectangular shape. Define the direction along the first side of the rectangle as the first direction, and the direction along the second side as the second direction. The first side and the second side are adjacent sides. The distance between single wires 1 along the first direction is L1, and the distance between single wires 1 along the second direction is L2. L1 = 0.06 - 0.12 mm, and L2 = 0.06 - 0.12 mm.

[0021] Thus, since the steel cord structure 10 is formed by twisting four single filaments at one time and there are gaps between the single filaments 1, a semi-open cord structure is formed, which has better rubber penetration performance. The rubber compound can penetrate more fully between the steel cords and form a closer contact with the surface of the steel cords, thereby improving the initial adhesion between the steel cords and the rubber, helping the rubber compound to better coat the steel cords, reducing the direct contact between the steel cords and the external environment, and effectively preventing the strength reduction of the steel cords caused by rust.

[0022] Furthermore, the diameter d1 of the single filament 1 is 0.37 - 0.39 mm. Compared with the currently 0.19 - 0.21 mm diameter single filaments, since the single filament diameter is thick, the twisted cord has a large stiffness, and the strength and stiffness of the skeleton material can help the tire maintain its shape and enable it to withstand the weight of the vehicle and the forces of the road surface.

[0023] In a preferred embodiment, the spacing L1 between the single filaments 1 in the first direction is 0.09 mm, and the spacing L2 between the single filaments 1 in the second direction is 0.09 mm. During twisting, a straightener is used to limit the single filaments 1 so that they form a rectangular distribution according to the preset spacing.

[0024] In an alternative embodiment, the twist pitch of the single filament 1 is 27 - 30 mm. The steel cord formed in this way has a large twist pitch, which can improve the production efficiency.

[0025] The diameter of the steel cord structure 10 formed according to the above embodiments is 0.80 - 0.90 mm. The linear density of the steel cord structure is 3.5 - 3.7 g / m. The breaking force of the steel cord structure is above 1545 N, and the strength of the single filament 1 is above 3600 Mpa.

[0026] The steel cord has a relatively large linear density and higher load-bearing capacity, which helps to enhance the strength of the tire. Due to its high strength, the thickness of the tire belt layer can be reduced to lower the weight of the tire, which not only helps to reduce the production cost of the tire but also can reduce the rolling resistance of the tire and improve fuel economy.

[0027] The breaking force tests of the products formed by different single filament diameters and twist pitches are as follows in the table

[0028] Project Example 1 Example 2 Example 3 Structure 4*0.38UTOC 4*0.39UT OC 4*0.37UT OC Monofilament diameter 0.38mm 0.39mm 0.37mm Twist direction S S S Twist pitch 27mm 28mm 27mm Linear density 3.61g / m 3.75g / m 3.57g / m Diameter 0.85mm 0.942mm 0.845mm Breaking force 1585N 1595 1580 L clearance 0.09mm 0.08mm 0.08mm

[0029] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Those with ordinary knowledge in the technical field to which the present utility model pertains can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to what is defined by the claims.

Claims

1. A steel cord structure for all-steel radial truck tires, characterized in that, It is formed by twisting four single wires (1) at one time, and the twisting direction is S or Z; Among them, in the cross-section of the steel cord, the four single wires (1) are distributed in a rectangle. The direction along the first side of the rectangle is defined as the first direction, the direction along the second side is defined as the second direction, and the first side and the second side are adjacent sides; The distance between the single wires (1) along the first direction is L1, and the distance between the single wires (1) along the second direction is L2. L1 = 0.06 - 0.12 mm, L2 = 0.06 - 0.12 mm.

2. The steel cord structure for all-steel radial truck tires according to claim 1, characterized in that, The diameter d1 of the single wire (1) is 0.37 mm to 0.39 mm.

3. The steel cord structure for all-steel radial truck tires according to claim 1, characterized in that, The diameter d1 of the single wire (1) is 0.38 mm.

4. The steel cord structure for all-steel radial truck tires according to claim 1, wherein, The distance L1 between the single wires (1) along the first direction is 0.09 mm, and the distance L2 between the single wires (1) along the second direction is 0.09 mm.

5. The steel cord structure for all-steel radial truck tires according to claim 1, wherein, The twist pitch of the single wire (1) is 27 - 30 mm.

6. The steel cord structure for all-steel radial truck tires according to claim 1, characterized in that, The diameter of the steel cord structure is 0.80 - 0.90 mm.

7. The steel cord structure for all-steel radial truck tires according to claim 6, characterized in that, The linear density of the steel cord structure is 3.5 - 3.7 g / m.

8. The steel cord structure for all-steel radial truck tires according to claim 1, characterized in that, The breaking force of the steel cord structure is above 1545 N, and the strength of the single wire (1) is above 3600 Mpa.

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