Steel wire cord structure for engineering radial tire framework material
By adopting a three-layer steel cord design, the gap between the core strand and the outer strand is increased, the problem of the bearing capacity of steel cords failing due to wear in the prior art, and a stronger rubber bonding force and tire stability are achieved.
Patent Information
- Application Number
- CN202421682455.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-16
AI Technical Summary
In the existing steel cord structure, the gap between the steel wires is insufficient, resulting in the inability to penetrate sufficiently, resulting in the problem of cord load-bearing capacity failure due to wear.
A three-layer steel cord design is adopted, where the core strand and outer strand have the same structure, but the twist direction is opposite, the cord structure and core strand are the same, and the twist direction of the outer winding wire is opposite to the twist direction of the cord structure, thereby increasing the gap between each single wire and promoting rubber penetration.
By increasing the gap between the steel wires, the rubber is promoted to fully penetrate, the bonding force between the steel wire and rubber is enhanced, point contact friction is avoided, and the load-bearing capacity of the cord and the overall strength of the tire is improved.
Smart Images
Figure CN222923515U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steel cord, and particularly relates to a steel cord structure for the carcass material of engineering radial tires. Background Art
[0002] Steel cord is an important component in the carcass material of engineering radial tires. The commonly used 7×(3 + 9)×d1 + d2 high-tensile (HT) structure steel cord for engineering radial tires is composed of one core strand wire, six outer strand wires, and one outer winding wire twisted together. The core strand wire and the outer strand wires have the same structure, the strands of each layer are arranged relatively closely, and the gap between the outer strand wires is small. Rubber cannot effectively penetrate into the core strand wire, resulting in a relatively high air content inside the cord.
[0003] During the use of radial tires, problems such as the failure of the cord's load-bearing capacity due to insufficient strength of the steel cord, or corrosion and wear of the steel wire are likely to occur. The structure, strength, bending stiffness, and adhesion performance of the steel cord to rubber have a direct impact on the tire. Defects caused by unreasonable structure design cannot be completely compensated for only by controlling the production process of the steel cord. Summary of the Utility Model
[0004] In view of the technical problems existing in the steel cord structure in the prior art, a first aspect of the utility model provides a steel cord structure for the carcass material of engineering radial tires, including a cord and an outer winding wire. The outer winding wire is wound around the outer layer of the cord, and the lay length of the outer winding wire is t1;
[0005] The cord includes a core strand wire and at least six outer strands twisted around the outer layer of the core strand wire, and the lay length of the cord is t2;
[0006] The core strand wire includes at least three first core wire and at least nine second core wire twisted around the first core wire, and the outer strand includes at least three first outer wire and at least nine second outer wire twisted around the first outer wire;
[0007] Wherein, the distance L1 between the first core wire and the second core wire in the core strand wire is not less than 0.04 mm, the lay length of the first core wire is t3, the distance between the second core wire is t4, the distance L2 between the first outer wire and the second outer wire in the outer strand is not less than 0.04 mm, the lay length of the first outer wire is t5, and the lay length of the second outer wire is t6.
[0008] Preferably, the pitch t4 of the second core strand wire is twice the pitch t3 of the first core strand wire, and the pitch t6 of the second outer strand wire is twice the pitch t5 of the first outer strand wire.
[0009] Preferably, the pitch t3 of the first core strand wire is equal to the pitch t5 of the first outer strand wire, and the pitch t4 of the second core strand wire is equal to the pitch t6 of the second outer strand wire.
[0010] Preferably, the pitch t3 of the first core strand wire is 6.25 mm, and the pitch t4 of the second core strand wire is 12.5;
[0011] The pitch t5 of the first outer strand wire is 6.25 mm, and the pitch t61 of the second outer strand wire is 12.5.
[0012] Preferably, the lay direction of the first core strand wire is S, the lay direction of the second core strand wire is S, the lay direction of the first outer strand wire is Z, the lay direction of the second outer strand wire is Z, the lay direction of the cord is S, and the lay direction of the outer winding wire is Z.
[0013] Preferably, the lay direction of the first core strand wire is Z, the lay direction of the second core strand wire is Z, the lay direction of the first outer strand wire is S, the lay direction of the second outer strand wire is S, the lay direction of the cord is Z, and the lay direction of the outer winding wire is S.
[0014] Preferably, the diameters of the first core strand wire and the second core strand wire are d1, and the diameters of the first outer strand wire and the second outer strand wire are d2, where d1 = d2, d1 = 0.19 - 0.26 mm, and d2 = 0.19 - 0.26 mm.
[0015] Preferably, the diameter of the outer winding wire is 0.15 - 0.25 mm.
[0016] Preferably, the strength grades of the first core strand wire, the second core strand wire, the first outer strand wire, and the second outer strand wire are ordinary strength, high strength, ultra-high strength, or extra-high strength.
[0017] Compared with the prior art, the advantages of the present utility model are as follows:
[0018] The steel cord structure proposed by the present utility model consists of a core strand, an outer strand, and an outer winding wire, forming a three-layer structure. The structures of the core strand and the outer strand are the same, but the lay directions are opposite. The lay direction of the cord is the same as that of the core strand, and the lay direction of the outer winding wire is opposite to that of the cord structure. In this way, the gaps between the individual wires in the formed steel cord structure are relatively large, which is conducive to the rubber fully infiltrating into the core strand wires, avoiding point contact friction between the wires of each layer due to insufficient infiltration of rubber, and thus being able to solve the problem of the failure of the steel cord's load-bearing capacity due to wear. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in each figure may be denoted by the same reference numeral. For the sake of 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:
[0020] Figure 1 is a schematic structural view of a steel cord structure for a carcass material of an engineering radial tire shown in the present utility model;
[0021] Figure 2 is a schematic structural view of a core strand shown in the present utility model;
[0022] Figure 3 is a schematic structural view of an outer strand shown in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] 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.
[0024] As Figures 1 to 3 shown, a first aspect of the present utility model provides a steel cord structure for a carcass material of an engineering radial tire, which includes a cord 100 and an outer winding wire 200. The outer winding wire 200 is wound around the outer layer of the cord 100. The cord 100 includes a core strand 10 and at least six outer strands 20 twisted around the outer layer of the core strand 10. Among them, the pitch of the outer winding wire 200 is t1, and the pitch of the cord 100 is t2, and t2 > t1.
[0025] Optionally, the diameter of the outer winding wire 200 is 0.15 - 0.25 mm.
[0026] Further, as Figures 2 - 3 shown, the core strand 10 includes at least three first core strand steel wires 11 and at least nine second core strand steel wires 12 twisted around the first core strand steel wires 11. The outer strand 20 includes at least three first outer strand steel wires 21 and at least nine second outer strand steel wires 22 twisted around the first outer strand steel wires 21.
[0027] Among them, the distance L1 between the first core strand steel wires 11 and the second core strand steel wires 12 in the core strand 10 is not less than 0.04 mm. The pitch of the first core strand steel wires 11 is t3, and the pitch of the second core strand steel wires 12 is t4. The distance L2 between the first outer strand steel wires 21 and the second outer strand steel wires 22 in the outer strand 20 is not less than 0.04 mm. The pitch of the first outer strand steel wires 21 is t5, and the pitch of the second outer strand steel wires 22 is t6.
[0028] In this way, there are gaps between each steel wire of the core strand 10, and there are gaps between each steel wire of the outer strand 20, which can increase the rubber penetration performance of the strands, enable the rubber to penetrate more fully into the interior of the steel cord, form a stronger bonding force, avoid the point-contact friction between the steel wires of each layer caused by insufficient penetration of rubber, and thus can solve the problem of the failure of the steel cord's load-bearing capacity due to wear. Moreover, the improvement of the rubber penetration performance helps to improve the overall strength of the tire, making the tire more stable and reliable during driving.
[0029] Optionally, the pitch t4 of the second core strand steel wire 12 is twice the lay length t3 of the first core strand steel wire 11, and the lay length t6 of the second outer strand steel wire 22 is twice the lay length t5 of the first outer strand steel wire 21. Among them, the lay length t3 of the first core strand steel wire 11 is equal to the lay length t5 of the first outer strand steel wire 21, and the pitch t4 of the second core strand steel wire 12 is equal to the lay length t6 of the second outer strand steel wire 22.
[0030] Furthermore, the diameters of the first core strand steel wire 11 and the second core strand steel wire 12 are d1, and the diameters of the first outer strand steel wire 21 and the second outer strand steel wire 22 are d2, where d1 = d2, d1 = 0.19 - 0.26 mm, and d2 = 0.19 - 0.26 mm.
[0031] In this way, the core strand 10 and the outer strand 20 have the same structure, only the lay lengths are different.
[0032] Optionally, control the lay length t3 of the first core strand steel wire 11 = 6.25 mm, and the pitch t4 of the second core strand steel wire 12 = 12.5; the lay length t5 of the first outer strand steel wire 21 = 6.25 mm, and the lay length t6 of the second outer strand steel wire 22 = 12.5.
[0033] In an alternative embodiment, the lay directions of the core strand 10 and the outer strand 20 are opposite, the lay direction of the cord 100 is the same as that of the core strand 10, and the lay direction of the outer winding wire 200 is opposite to that of the cord 100.
[0034] In this way, through the arrangement of the opposite lay directions of the core strand 10 and the outer strand 20, and the cord 100 and the outer winding wire 200, the distance between the single wires is increased to improve the rubber penetration performance.
[0035] Optionally, the lay direction of the first core strand steel wire 11 is the S direction, the lay direction of the second core strand steel wire 12 is the S direction, the lay direction of the first core strand steel wire 11 is the Z direction, the lay direction of the second outer strand steel wire 22 is the Z direction, the lay direction of the cord 100 is the S direction, and the lay direction of the outer winding wire 200 is the Z direction.
[0036] In other embodiments, the lay direction of the first core strand wire 11 is Z direction, the lay direction of the second core strand wire 12 is Z direction, the lay direction of the first core strand wire 11 is S direction, the lay direction of the second outer strand wire 22 is S direction, the lay direction of the cord 100 is Z direction, and the lay direction of the outer winding wire 200 is S direction.
[0037] In the above embodiments, the strength grades of the first core strand wire 11, the second core strand wire 12, the first outer strand wire 21, and the second outer strand wire 22 are ordinary strength, high strength, ultra-high strength, or extra-high strength.
[0038] Combined with the above embodiments, the steel cord structure proposed by the present utility model consists of a core strand, an outer strand, and an outer winding wire to form a three-layer structure. The structures of the core strand and the outer strand are the same, but the lay directions are opposite. The lay direction of the cord structure is the same as that of the core strand, and the lay direction of the outer winding wire is opposite to that of the cord structure. In this way, the gaps between the individual filaments in the steel cord structure are relatively large, which is conducive to the rubber fully infiltrating into the core strand wires, avoiding the point-contact friction between the layers of wires caused by insufficient infiltration of rubber, and thus being able to solve the problem of the failure of the steel cord's load-bearing capacity due to wear.
[0039] 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 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 what is defined by the claims.
Claims
1. A steel cord structure for an engineering radial tire skeleton material, characterized in that: It comprises a cord (100) and an outer winding wire (200), wherein the outer winding wire (200) is wound around the outer layer of the cord (100), and the twisting distance of the outer winding wire (200) is t1; The cord (100) comprises a core strand (10) and at least six outer strands (20) twisted on the outer layer of the core strand (10), and the twist length of the cord (100) is t2; The core strand (10) comprises at least three first core strand steel wires (11) and at least nine second core strand steel wires (12) twisted outside the first core strand steel wires (11); the outer strand (20) comprises at least three first outer strand steel wires (21) and at least nine second outer strand steel wires (22) twisted outside the first outer strand steel wires (21); The spacing L1 between the first core strand steel wire (11) and the second core strand steel wire (12) in the core strand wire (10) is not less than 0.04 mm, the twist pitch of the first core strand steel wire (11) is t3, and the spacing of the second core strand steel wire (12) is t4; the spacing L2 between the first outer strand steel wire (21) and the second outer strand steel wire (22) in the outer strand wire (20) is not less than 0.04 mm, the twist pitch of the first outer strand steel wire (21) is t5, and the twist pitch of the second outer strand steel wire (22) is t6.
2. The steel cord structure for engineering radial tire skeleton material according to claim 1, characterized in that: The spacing t4 of the second core strand steel wire (12) is twice the lay length t3 of the first core strand steel wire (11), and the lay length t6 of the second outer strand steel wire (22) is twice the lay length t5 of the first outer strand steel wire (21).
3. The steel cord structure for engineering radial tire skeleton material according to claim 2, characterized in that: The lay pitch t3 of the first core strand steel wire (11) is equal to the lay pitch t5 of the first outer strand steel wire (21), and the pitch t4 of the second core strand steel wire (12) is equal to the lay pitch t6 of the second outer strand steel wire (22).
4. The steel cord structure for engineering radial tire skeleton material according to claim 2, characterized in that: The lay length t3 of the first core steel wire (11) is 6.25 mm, and the pitch t4 of the second core steel wire (12) is 12.5 mm; The twist pitch t5 of the first outer layer steel wire (21) is 6.25 mm, and the twist pitch t6 of the second outer layer steel wire (22) is 12.
5.
5. The steel cord structure for engineering radial tire skeleton material according to claim 1, characterized in that: The twist direction of the first core strand steel wire (11) is S, the twist direction of the second core strand steel wire (12) is S, the twist direction of the first core strand steel wire (11) is Z, the twist direction of the second outer layer strand steel wire (22) is Z, the twist direction of the cord (100) is S, and the twist direction of the outer winding wire (200) is Z.
6. The steel cord structure for engineering radial tire skeleton material according to claim 1, characterized in that: The twist direction of the first core strand steel wire (11) is the Z direction, the twist direction of the second core strand steel wire (12) is the Z direction, the twist direction of the first core strand steel wire (11) is the S direction, the twist direction of the second outer layer strand steel wire (22) is the S direction, the twist direction of the cord (100) is the Z direction, and the twist direction of the outer winding wire (200) is the S direction.
7. The steel cord structure for engineering radial tire skeleton material according to claim 1, characterized in that: The diameter of the first core strand steel wire (11) and the second core strand steel wire (12) is d1, and the diameter of the first outer strand steel wire (21) and the second outer strand steel wire (22) is d2, d1=d2, d1=0.19-0.26 mm, d2=0.19-0.26 mm.
8. The steel cord structure for engineering radial tire skeleton material according to claim 1, characterized in that: The diameter of the outer winding wire (200) is 0.15-0.25 mm.
9. The steel cord structure for engineering radial tire skeleton material according to claim 1, characterized in that: The strength grades of the first core strand steel wire (11), the second core strand steel wire (12), the first outer layer strand steel wire (21) and the second outer layer strand steel wire (22) are ordinary strength, high strength, ultra-high strength or extra-high strength.