Steel wire cord, winding belted layer and tire

Abstract

The utility model provides a steel wire cord, a winding belted layer and a tire, the steel wire cord is used for the winding belted layer of the tire, the steel wire cord is provided with a non-open type 1 * n structure, in the 1 * n structure, n monofilaments are twisted together at a lay length L in the twisting direction, the monofilament has a periodically continuous pre-deformation waveform structure. According to the technical scheme, the 1 * n steel wire cord tire with sufficient elongation and rubber permeability can be provided, on the premise that the strength of the steel wire does not need to be improved, the shock resistance of the motorcycle tire is improved, the problems of yarn breaking, bulging and head scattering are solved, and meanwhile the good riding comfort is achieved.

Description

Technical Field

[0001] The utility model relates to a steel cord, a winding belt layer and a tire. Background Art

[0002] Steel cord is the preferred material for reinforcing the belt layer of motorcycle tires due to its excellent tensile strength, impact resistance and adhesion to rubber. UT is an open ultra-high strength steel cord currently used. This structure has good rubber permeability, but there is a risk of impact yarn breakage, bulging, and loose ends. Low wind pressure will aggravate this phenomenon, affecting driving safety and increasing the risk of customer complaints. At present, there are several conventional ways to improve it: 1. Increasing the number of monofilaments or the strength of monofilaments. Although it can improve the problem of steel wire impact breakage, it will inevitably affect riding comfort. 2. Monofilament pre-bending, the elongation is slightly improved, and the impact resistance is improved, but the loose ends problem still exists, and it has the following limitations: on the one hand, the degree of pre-bending of monofilaments is easy to reach the limit, and on the other hand, the cord will be subjected to different degrees of tension during calendering, tire molding and vulcanization, which weakens the pre-bending effect. 3. The use of a non-open structure will improve the loose ends problem, but it will reduce the rubber permeability and cannot significantly improve the impact resistance. 4. Reduce the twist pitch. When the twist pitch is reduced to the limit, the impact resistance will be improved, but the loose ends problem still exists and will significantly reduce the rubber permeability Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the above-mentioned prior art and to provide a tire with a 1×n steel cord having sufficient elongation and rubber permeability, which improves the impact resistance and the problems of yarn breakage, bulging and loose ends of motorcycle tires without increasing the strength of the steel wire, and at the same time has better riding comfort.

[0004] In order to solve the above technical problems, the utility model provides a steel cord, which has a non-open 1×n structure. In the 1×n structure, n single filaments are twisted together with a twist length L in the twist direction; the single filaments have a periodic continuous pre-deformed waveform structure; the pre-deformed waveform structure contains 1 peak and 1 trough within a periodic distance C.

[0005] In a more preferred embodiment, the diameter D of the virtual circumscribed circle of the steel cord is 0.5-0.7 mm, the number n of the monofilaments is 2-6; the diameter d of the monofilaments is 0.18-0.22 mm; and the lay length L is 11.0-13.0 mm.

[0006] In a more preferred embodiment, the ratio of the period distance C of the pre-deformed waveform structure to the lay length L is C / L<1.

[0007] In a more preferred embodiment, 1 / 3≤C / L≤1 / 2.

[0008] In a more preferred embodiment, the ratio of the trough width b to the peak width a of the pre-deformed corrugated structure is b / a≤1.

[0009] In a more preferred embodiment, 1 / 3≤b / a≤1 / 2.

[0010] In a more preferred embodiment, the ratio of the wave peak height h1 to the wave valley height h2 is 1≤h1 / h2≤2.

[0011] In a more preferred embodiment, the ratio of the wave crest height h1 of the pre-deformed wave-shaped structure to the diameter d of the monofilament is 1

[0012] In a more preferred embodiment, the ratio of the period distance C of the pre-deformed waveform structure to the lay length L is C / L<1; the ratio of the trough width b to the peak width a of the pre-deformed waveform structure is b / a≤1; the ratio of the peak height h1 to the trough height h2 is 1≤h1 / h2≤2; the ratio of the peak height h1 of the pre-deformed waveform structure to the diameter d of the monofilament is 1

[0013] In a more preferred embodiment, 1 / 3≤C / L≤1 / 2, 1 / 3≤b / a≤1 / 2.

[0014] A winding belt layer comprises the above-mentioned steel cord.

[0015] A tire comprises the above-mentioned winding belt layer.

[0016] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0017] 1. The utility model provides a tire containing 1×n high-performance steel cord. The steel cord adopts a non-open structure. Without changing the original single-filament wire diameter and twist pitch and improving the strength of the steel wire, the steel cord has sufficient elongation and rubber permeability through the pre-bent waveform structure of the single wire, thereby improving the impact resistance of motorcycle tires and the problems of broken yarn, bulging and loose ends.

[0018] 2. The steel cord used in the tire of the utility model adopts a non-open structure, which can effectively solve the problem of loose ends of the steel cord after impact breakage;

[0019] 3. The utility model limits the ratio of the periodic distance of the steel cord single filament waveform structure to the twist pitch, thereby avoiding the problems of poor elongation improvement and decreased rubber permeability due to fewer waveform structures per unit twist pitch, and greater loss of single filament strength due to more waveform structures. ​​

[0020] 4. The utility model optimizes the design of the width and height of the crests and troughs in the waveform structure of the steel cord monofilament, which can facilitate the formation of a macroscopic waveform structure in the straight direction of the twisted steel wire without affecting the diameter of the twisted steel wire. The synergistic effect of the microscopic waveform formed by the pre-deformed monofilament increases the tensile buffering effect of the monofilament and the steel cord and the gap between them, thereby improving the elongation of the steel cord and the rubber permeability, and ultimately enabling the tire to obtain excellent impact resistance. After adopting the above scheme, the steel cord of the utility model has excellent elongation and rubber permeability, and the tire containing the above steel cord has excellent impact resistance and is not prone to bulging problems caused by broken yarns and loose ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The schematic diagram of the structure of the steel cord monofilament of the utility model is DETAILED DESCRIPTION

[0022] A steel cord is used for a winding belt layer of a tire. The steel cord has a non-open 1×n structure. In the 1×n structure, n single filaments are twisted together in a twist direction with a twist length L; the single filaments have a periodic continuous pre-deformed waveform structure; the pre-deformed waveform structure contains one crest and one trough within a period distance C.

[0023] The diameter D of the virtual circumscribed circle of the steel cord is 0.5-0.7 mm, the number n of the monofilaments is 2-6; the diameter d of the monofilaments is 0.18-0.22 mm; and the lay length L is 11.0-13.0 mm.

[0024] The ratio of the period distance C of the pre-deformed waveform structure to the lay length L is C / L<1, preferably, 1 / 3≤C / L≤1 / 2.

[0025] The ratio of the trough width b to the peak width a of the pre-deformed corrugated structure is b / a≤1. Preferably, 1 / 3≤b / a≤1 / 2.

[0026] The ratio of the wave peak height h1 to the wave valley height h2 is 1≤h1 / h2≤2.

[0027] The ratio of the wave crest height h1 of the pre-deformed wave-shaped structure to the diameter d of the monofilament is 1

[0028] Embodiment 1:

[0029] ​The steel cord has a non-open 1×5 structure, in which 5 monofilaments are twisted together in the S twist direction with a twist pitch L; the monofilaments have a periodic continuous pre-deformed waveform structure; the pre-deformed waveform structure contains 1 crest and 1 trough within a period distance C. The virtual circumscribed circle diameter D of the steel cord is 0.7 mm, the number of monofilaments n is 5; the monofilament diameter d is 0.22 mm; the twist pitch L is 13.0 mm;

[0030] The monofilament wave structure has the following limitations: the ratio of the wave structure period distance C to the twist length L is C / L=1 / 2, the ratio of the wave valley width b to the wave peak width a is b / a=1, the ratio of the wave peak height h1 to the wave valley height h2 is h1 / h2=1, and the ratio of the wave peak height h1 to the monofilament diameter d is h1 / d=1.5;

[0031] Embodiment 2:

[0032] The steel cord structure, lay pitch, steel wire diameter, and single wire diameter are consistent with those in Example 1;

[0033] The monofilament waveform structure has the following limitations: the ratio of the waveform structure period distance C to the twist length L is C / L=1 / 3, the ratio of the trough width b to the peak width a is b / a=1 / 2, the ratio of the peak height h1 to the trough height h2 is h1 / h2=1, and the ratio of the peak height h1 to the monofilament diameter d is h1 / d=1.5;

[0034] Embodiment 3:

[0035] The steel cord structure, lay pitch, steel wire diameter, and single wire diameter are consistent with those in Example 1;

[0036] The monofilament waveform structure has the following limitations: the ratio of the waveform structure period distance C to the twist length L is C / L=1 / 2, the ratio of the trough width b to the peak width a is b / a=1 / 3, the ratio of the peak height h1 to the trough height h2 is h1 / h2=2, and the ratio of the peak height h1 to the monofilament diameter d is h1 / d=1.5;

[0037] Comparative Example 1:

[0038] The steel cord has an open 1×5 structure in which five monofilaments are twisted together in an S-twist direction with a twist length of L; the monofilaments do not have a pre-deformed wave structure.

[0039] The steel cord lay pitch, steel wire diameter and single wire diameter are consistent with those in Example 1;

[0040] According to the above conditions, the steel cords of Examples 1 to 3 and the comparative example were produced. In addition, the wires used in the steel cords were all high tensile strength steels with a consistent carbon content. In addition, the obtained cords were applied to the belt layer of motorcycle tires.

[0041] The following evaluation tests were conducted on the test steel cord and the test tire:

[0042] 1. Tensile performance: Refer to GB / T228-2010 to test the tensile performance of semi-finished and finished tire steel wires. The results are expressed as relative indexes (the comparison ratio is 100); the larger the elongation and breaking force × elongation values, the better the impact resistance of the steel wire.

[0043] 2. Impact resistance:

[0044] Semi-finished products: Use a pendulum to impact the semi-finished steel wire after gluing, record the impact force value, and the result is expressed as a relative index. The larger the value, the better the impact resistance of the steel wire;

[0045] Finished tires: Test the tires by placing obstacles of a certain volume on them at a speed of 10 km / hr for 2 hours, and visually evaluate the damage to the finished tires.

[0046] 3. Steel wire T-extraction performance: Prepare the steel wire to be tested and the corresponding rubber into a T-shaped specimen, extract the steel wire from the rubber on a tensile testing machine, and record the adhesion value between the steel wire and the rubber. The result is expressed as a relative index. The larger the value, the better the rubber permeability of the steel wire.

[0047] 4. Low wind pressure endurance running performance: refer to GB / T13203-2021, test wind pressure: 125kPa, speed: 81km / hr, run until damage, and visually evaluate the damage of the finished tire.

[0048] Comparison of test results:

[0049]

[0050] From the evaluation results shown in Table 1 above, it can be seen that the elongation, breaking force × elongation, impact resistance, wire T extraction, and low wind pressure durable running performance of the semi-finished products and finished tires of the test steel cords of Examples 1 to 3 are better than those of the comparative example. Therefore, it can be clearly seen that the solution of the utility model can make the tire have excellent impact resistance and is not prone to bulging problems caused by broken yarns and loose ends.

[0051] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A steel cord, characterized in that: The steel cord has a non-open 1×n structure, in which n single filaments are twisted together in the twist direction with a twist length L; the single filaments have a periodic and continuous pre-deformed waveform structure; The periodic distance C of the pre-deformed waveform structure contains one wave crest and one wave trough.

2. A steel cord according to claim 1, characterized in that: The diameter D of the virtual circumscribed circle of the steel cord is 0.5-0.7 mm, the number n of the monofilaments is 2-6; the diameter d of the monofilaments is 0.18-0.22 mm; and the lay length L is 11.0-13.0 mm.

3. A steel cord according to claim 1 or 2, characterized in that: The ratio of the period distance C of the pre-deformed waveform structure to the lay length L is C / L<1.

4. A steel cord according to claim 3, characterized in that: 1 / 3≤C / L≤1 / 2.

5. A steel cord according to claim 1 or 2, characterized in that: The ratio of the trough width b to the peak width a of the pre-deformed corrugated structure is b / a≤1.

6. A steel cord according to claim 5, characterized in that: 1 / 3≤b / a≤1 / 2.

7. A steel cord according to claim 1 or 2, characterized in that: The ratio of the wave peak height h1 to the wave valley height h2 is 1≤h1 / h2≤2.

8. A steel cord according to claim 1 or 2, characterized in that: The ratio of the wave crest height h1 of the pre-deformed wave-shaped structure to the diameter d of the monofilament is 1<h1 / d≤1.

5.

9. A winding belt layer, characterized in that: The invention comprises a steel cord as claimed in any one of claims 1 to 8.

10. A tire, characterized in that: Comprising a wrapping belt layer as claimed in claim 9.

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