Steel wire cord structure for engineering radial tire

Abstract

The utility model relates to the technical field of tire production, in particular to a steel wire cord structure for an engineering radial tire, which comprises a core strand and six surface strands woven and twisted on the outer side of the core strand, each of the core strand and the surface strands comprises seven monofilaments, and the seven monofilaments are woven and twisted by adopting a 1 * 7 structure. A gap is formed between any two adjacent monofilaments, so that the steel wire cord is of a 7 * 7 structure, the monofilaments with ultrahigh strength are adopted for making an engineering tire cord body, the weight of a tire is reduced, the use amount of rubber of the tire is reduced, the manufacturing cost of the tire is reduced, meanwhile, the fatigue performance of the tire is greatly improved, and the service life of the tire is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of tire production, in particular to a steel cord structure for engineering meridian tires. Background Art

[0002] As a kind of tire mainly used in mines, docks and special equipment, the working environment of engineering meridian tires is relatively harsh, and the load borne by the tires is relatively large. Therefore, the safety performance of the tires is particularly important. As the main tire body to ensure the safety performance of engineering meridian tires, the strength of the cord is required to meet the requirements so as to ensure the safety performance of the tires.

[0003] Currently, the engineering tires used in engineering machinery all use ordinary tensile strength (abbreviated as NT) and high tensile strength (abbreviated as HT) cord structures. The usage amount of tire rubber and steel wire is relatively large, and the overall weight of the tire is relatively heavy, which greatly increases the production cost. Therefore, how to reduce the weight of the tire, reduce the usage amount of tire rubber, and reduce the manufacturing cost of the tire without reducing the safety factor while maintaining the stable service life of the original product has become an urgent problem to be solved. Summary of the Utility Model

[0004] The utility model provides a steel cord structure for engineering meridian tires, which includes a core strand and six surface strands twisted outside the core strand. Both the core strand and the surface strands include seven single wires, and the seven single wires are twisted into a 1*7 structure, and there is a gap between any two adjacent single wires, so that the steel cord is a 7*7 structure.

[0005] Preferably, the diameter of the single wire is set to be 0.19 mm to 0.21 mm.

[0006] Preferably, the twist pitch of the single wire is controlled to be 18 mm to 22 mm.

[0007] Preferably, the twist direction of the single wire, the core strand and the surface strands is set to be the same direction twist.

[0008] Preferably, the twist direction of the single wire, the core strand and the surface strands is set to be ZZ or SS.

[0009] Preferably, the strength of the single wire is 3750 MPa to 3850 MPa.

[0010] Preferably, the single wires of the core strand are pre-deformed during twisting, and the pre-deformation wave height is set to be 1% to 5% of the diameter of the steel cord.

[0011] Preferably, the breaking tensile force of the core strand and the surface strands is 650 N to 750 N.

[0012] Preferably, the linear density of the steel cord is 12.85 g / m.

[0013] Preferably, the breaking tensile force of the steel cord ≥ 4800 N.

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

[0015] The steel cord proposed by the present utility model includes a core strand and surface strands with a 1*7 structure distribution. The seven single wires of each strand are twisted and formed by a 1*7 structure, making the overall steel cord a 7*7 structure without an outer winding structure. Using ultra-high-strength single wires as the carcass of the engineering tire cord can reduce the weight of the tire, reduce the usage amount of the tire rubber, reduce the manufacturing cost of the tire, and greatly improve the fatigue performance and service life of the tire. 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 examples and with reference to the drawings, wherein:

[0017] Figure 1 is a schematic diagram of the steel cord structure for an engineering radial tire shown in an embodiment of the present utility model;

[0018] 01, single wire; 10, core strand; 20, surface strand. Detailed Embodiments

[0019] 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.

[0020] Combined with Figure 1 shown, the present utility model provides a steel cord structure for an engineering radial tire, including a core strand 10 and six surface strands 20 twisted outside the core strand 10.

[0021] Among them, the steel cord includes seven strands, namely, the core strand 10 and surface strands 20 with a 1*7 structure distribution. At the same time, both the core strand 10 and the surface strands 20 include seven single wires 01. The seven single wires 01 of each strand are twisted and formed by a 1*7 structure, making the overall steel cord a 7*7 structure without an outer winding structure. Thus, the usage amount of steel and the usage amount of tire rubber can be reduced to lower the cost.

[0022] Furthermore, there is a gap between any two adjacent single wires 01, enabling the tire rubber to penetrate into the strands. Good rubber penetration performance helps to enhance the wear resistance, fatigue resistance, and service life of the tire.

[0023] Optionally, the diameter of the monofilament 01 is set to 0.19 mm to 0.21 mm, the twist pitch of the monofilament 01 is controlled to be 18 mm to 22 mm, the strength of the monofilament 01 is 3750 MPa to 3850 MPa, and the twist direction of the monofilament 01, the core strand 10, and the surface strand 20 is set to the same direction twist, and its twist direction is set to ZZ (that is, the twist directions of the monofilament 01, the core strand 10, and the surface strand 20 are all right twists) or SS (that is, the twist directions of the monofilament 01, the core strand 10, and the surface strand 20 are all left twists), which can reduce the twist loss of the steel cord by 1% to 3%, and at the same time reduce the stress concentration of the steel cord in the tire. This steel cord with the same direction twist has a relatively flat and soft surface and has good anti-bending fatigue performance. Therefore, it is relatively durable in use, and thus the service life of the tire is longer.

[0024] In this way, on the premise that the service life of the original product is stable and the safety factor is not reduced, by using the monofilament 01 with super high strength (abbreviated as ST) as the carcass of the engineering tire cord, while reducing the weight of the tire, reducing the usage amount of the rubber of the tire, and reducing the manufacturing cost of the tire, the fatigue performance of the tire and the service life of the tire are greatly improved.

[0025] Furthermore, the monofilament 01 of the core strand 10 is pre-deformed during twisting, and the pre-deformation wave height is set to 1% to 5% of the diameter of the steel cord. The pre-deformation treatment can improve the strength of the steel cord and ensure the overall structural stability of the steel cord. By using the pre-deformed high-strength steel cord, the density and rubber consumption of the steel cord can be reduced on the premise of ensuring performance, thereby reducing the production cost of the tire.

[0026] In some embodiments, the breaking tensile force of the core strand 10 and the surface strand 20 is 650 N to 750 N, having relatively high strength and load-bearing capacity.

[0027] Furthermore, the linear density of the steel cord is 12.85 g / m, the breaking tensile force of the steel cord ≥ 4800 N. The steel cord obtains a relatively high breaking tensile force with a relatively low linear density, reduces the overall weight of the tire while reducing the steel usage amount, and has good anti-tensile performance, enabling the tire to have good load-bearing capacity.

[0028] Example 1

[0029] The steel cord structure for engineering radial tires is braided by the monofilament 01 with a 7*7 structure. The diameter of the monofilament 01 is 0.20 mm, and the twist pitch of the monofilament 01 is controlled to be 20 mm.

[0030] The steel cord for the belt layer of the radial tire is all braided in one go.

[0031] The steel cord for the belt layer of the radial tire in Example 1 was tested and compared with the 7×7×0.22+0.15HT steel cord. The data are shown in Tables 1, 2 and 3 below.

[0032] Table 1. Comparison of specific implementation data between the steel cord in Example 1 and the 7×7×0.22+0.15HT steel cord

[0033]

[0034] As described in Example 1 above, the steel cord has a lower linear density, a smaller wire diameter and a higher strength compared with the 7×7×0.22+0.15HT steel cord. It can reduce the thickness of the calendered cord fabric and the amount of calendered rubber compound, thereby achieving the purpose of reducing costs and lightening the weight of the tire, and improving the fatigue performance and service life of the tire.

[0035] Table 2. Comparison of the stiffness between the steel cord in Example 1 and the 7×7×0.22+0.15HT steel cord:

[0036]

[0037]

[0038] The stiffness of the steel cord in Example 1 is lower than that of the 7×7×0.22+0.15HT. For the steel cord of the tire carcass, it is more convenient for the tire shaping to be bent and is more suitable for use in the carcass of the engineering tire.

[0039] Table 3. Comparison of the costs between the steel cord in Example 1 and the 7×7×0.22+0.15HT steel cord:

[0040]

[0041] As shown in the above table, when the steel cord in Example 1 is used to replace the 7×7×0.22+0.15HT steel cord, the amount of steel cord used in the tire is reduced by 332 g / m 2 , the amount of rubber compound used is reduced by 178 g / m 2 , and the total mass of the cord fabric is reduced by 510 g / m 2 .

[0042] Combined with the above examples, the steel cord includes a core strand 10 and a surface strand 20 with a 1*7 structure distribution. Each of the seven single wires 01 of each strand is formed by twisting with a 1*7 structure, so that the whole steel cord has a 7*7 structure and does not have an outer winding structure. Using ultra-high-strength single wires 01 as the carcass of the engineering tire cord can greatly improve the fatigue performance and service life of the tire while reducing the weight of the tire, reducing the amount of rubber used in the tire, and reducing the manufacturing cost of the tire.

[0043] Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Those of ordinary skill in the technical field to which the present utility model pertains can make various modifications and refinements 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 that defined by the claims.

Claims

1. A steel cord structure for an engineering radial tire, characterized in that: The invention comprises a core strand (10) and six surface strands (20) twisted on the outer side of the core strand (10), wherein the core strand (10) and the surface strand (20) each comprise seven monofilaments (01), and the seven monofilaments (01) are twisted in a 1*7 structure, and there is a gap between any two adjacent monofilaments (01), so that the steel cord has a 7*7 structure.

2. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The diameter of the monofilament (01) is set to 0.19 mm to 0.21 mm.

3. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The twist length of the monofilament (01) is controlled to be 18 mm to 22 mm.

4. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The twisting directions of the monofilament (01) and the core strands (10) and the surface strands (20) are arranged to be twisted in the same direction.

5. The steel cord structure for an engineering radial tire according to claim 4, characterized in that: The twist directions of the monofilament (01) and the core strands (10) and the surface strands (20) are set to ZZ or SS.

6. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The strength of the monofilament (01) is 3750 MPa to 3850 MPa.

7. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The monofilaments (01) of the core strand (10) are pre-deformed during twisting, and the pre-deformation wave height is set to 1% to 5% of the diameter of the steel cord.

8. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The breaking tensile force of the core strand (10) and the surface strand (20) is 650N-750N.

9. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The linear density of the steel cord is 12.85 g / m.

10. The steel cord structure for an engineering radial tire according to claim 1, characterized in that: The breaking tension of the steel cord is ≥4800N.

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