A cable-shaped bead, a method for manufacturing a cable-shaped bead, and a tire

Abstract

The present invention discloses a cable-type bead, a method for manufacturing a cable-type bead and a tire in the technical field of tire processing, aiming to solve problems such as too small a gap between outer winding wires and relatively low rubber permeability in an actual cable-type bead. It includes an annular core wire; at least one layer of outer winding wires is spirally wound around the outer periphery of the core wire; at least one winding pitch is different from adjacent winding pitches within the first winding period of at least one layer of the outer winding wires; the present invention is applicable to tire processing, which can not only improve the bonding force between rubber and the cable-type bead, but also enable rubber to better protect the cable-type bead to prevent rust, and can also reduce the contact friction between outer winding wires, thereby improving the service life of the tire.

Description

Technical Field

[0001] The present invention relates to a cable-type bead, a method for manufacturing a cable-type bead, and a tire, belonging to the technical field of tire processing. Background Art

[0002] A cable-type bead is composed of an annular core wire and outer winding wires spirally wound around the core wire. The cable-type bead has good geometric stability, with uniform force on the inner and outer sides, small stress change in the bead, and good impact resistance, and is often applied to high-performance tires such as aircraft tires, racing tires, and special tires.

[0003] Conventional bead wires are generally coated with rubber first and then wound into a bead. For a cable-type bead, the outer winding wires are wound around the core wire to form a bead and then coated with rubber. Each layer of the outer winding wire consists of one wire. The outer winding wire moves circumferentially around the annular core wire and is wound around the core wire in a spiral shape. First, it has a first winding circumference, then a second winding circumference, and so on. Through repeated winding, the head and tail of the outer winding wire are joined by a joint.

[0004] Theoretically designed cable-type beads are supposed to form uniform winding gaps between the outer winding wires. However, due to the manufacturing characteristics of the cable-type bead, the outer winding wires are closely arranged together, reducing the contact area between the rubber and the cable-type bead and making it unfavorable for the rubber to penetrate during rubber coating. The prior art US6244318B1 provides a cable-type bead with fewer outer winding wires in the outermost layer than the theoretically designed number of windings to increase the winding gap and facilitate rubber penetration. However, the winding gap of the cable-type bead in the prior art is still insufficient, and the rubber permeability is relatively low. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a cable-type bead, a method for manufacturing a cable-type bead, and a wheel. Different winding pitches can be designed and arranged to change the arrangement distance of the outer winding wires on the core wire, so that there are winding gaps between the outer winding wires at the positions with different winding pitches, improving rubber permeability. This can not only improve the bonding force between the rubber and the cable-type bead, but also enable the rubber to better protect the cable-type bead against rust, and can also reduce the contact friction between the outer winding wires and improve the service life of the tire.

[0006] To achieve the above purpose, the present invention is implemented by the following technical solutions:

[0007] In a first aspect, the present invention provides a cable-type bead, including an annular core wire; at least one layer of outer winding wires is spirally wound around the outer periphery of the core wire; at least one winding pitch on at least one layer of the outer winding wires is different from the adjacent winding pitch.

[0008] Furthermore, each winding pitch on at least one layer of the outer winding wires is different from the adjacent winding pitch.

[0009] Further, at least one winding pitch on any layer of the outer winding line is different from an adjacent winding pitch.

[0010] Further, the value ranges of the length L2 of any winding pitch and the length L1 of an adjacent winding pitch on the outer winding line are as follows:

[0011] Further, the value ranges of the length L2 of any winding pitch and the length L1 of an adjacent winding pitch on the outer winding line are as follows:

[0012] Further, when there are at least two layers of the outer winding line, the winding directions of each layer of the outer winding line are the same.

[0013] Further, when there are at least two layers of the outer winding line, the winding directions of each layer of the outer winding line are opposite.

[0014] Further, the diameter of the core wire is 1.00 - 6.00 mm.

[0015] Further, the diameter of the outer winding line is 0.80 - 3.00 mm.

[0016] Further, the outer winding line is covered with a copper layer; or a zinc layer; or a brass layer; or a bronze layer; or an organic coating.

[0017] Further, the tensile strength of the outer winding line is above 2000 MPa.

[0018] Further, the core wire is made of a metallic material or a non-metallic material.

[0019] In a second aspect, the present invention provides a method for manufacturing any one of the above-mentioned cable-type bead wires, including:

[0020] Step 1: Using a wire to make a ring-shaped core wire;

[0021] Step 2: Preparing the outer winding line into a loop shape, and making the outer winding line wind around the core wire for a length of one layer; wherein, the loop shape is set such that at least one loop size of the outer winding line loop is different from that of an adjacent loop within the first winding periodic length of winding around the core wire, and subsequent periodic windings are arranged correspondingly along the arrangement mode of the previous period;

[0022] Step 3: Spirally winding the pre-prepared loop-shaped outer winding line around the core wire. According to the different loop sizes of the outer winding line and adjacent loops, different winding pitches exist in the outer winding line wound around the core wire, thereby forming a uniform winding gap;

[0023] Step 4: After the pre-prepared loop-shaped outer winding line is spirally wound around the core wire for one layer, fixing the head and tail of the outer winding line together by using a joint to obtain a one-layer cable-type bead wire;

[0024] Step Five: Repeat Steps Two to Four to obtain a multi-layer cable-type bead.

[0025] Furthermore, the value ranges of the circumferential length C2 of any one outer winding coil on the outer winding wire and the circumferential length C1 of the adjacent coil are:

[0026] Furthermore, the distance length L0 between two adjacent outer winding coils with a circumferential length of C2 is such that the value range of L0 is: 2·L1 ≤ L0 ≤ C0, where L1 is the winding pitch of the outer winding coil with a circumferential length of C1; C0 is the circumferential length of the outer winding wire advancing one core wire loop along the circumferential spiral winding of the core wire.

[0027] In a third aspect, the present invention provides a tire including the cable-type bead described in any one of the above.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention:

[0029] In the cable-type bead provided in the present application, at least one layer of outer winding wire is spirally wound around the outer periphery of the core wire, and at least one winding pitch different from the adjacent winding pitch is provided on at least one layer of the outer winding wire; such a design arrangement can obtain different winding pitches to change the arrangement distance of the outer winding wire on the core wire, so that there are winding gaps between the outer winding wires at the positions of the different winding pitches, improving the rubber permeability, which can not only improve the bonding force between the rubber and the cable-type bead, but also enable the rubber to better protect the cable-type bead against corrosion, and can also reduce the contact friction between the outer winding wires, improving the service life of the tire.

[0030] The present application also provides a method for manufacturing the cable-type bead of the present application. Before the outer winding wire is wound around the core wire, first, the outer winding wire as a whole is selected according to the actual size of one or more outer winding coils and the different settings of adjacent coils, and corresponding periodic prefabrication is carried out, and then spiral winding is carried out to obtain a cable-type bead with the same effect as that of the present application. Description of the Drawings

[0031] Figure 1 is a winding schematic diagram of a cable-type bead in the prior art;

[0032] Figure 2 is a winding schematic diagram of a specific embodiment of a cable-type bead provided by the present invention;

[0033] Figure 3 is a state diagram of the prefabrication process of the outer winding wire in a method for manufacturing a cable-type bead provided by the present invention;

[0034] In the figures: 10, core wire; 11, outer winding wire; 12, gap. Detailed implementation mode

[0035] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0036] Description of the production of cable-type bead in actual production: The outer winding wire 11 of each layer of winding of the core wire 10 is composed of a single wire. The outer winding wire 11 moves circumferentially around the annular core wire 10 and also spirally winds around the core wire 10 itself. The outer winding wire 11 advances helically along the circumference of the annular core wire 10 by one pitch, which is called one winding pitch; the outer winding wire 11 advances along the circumference of the annular core wire 10 by one circumferential length of the core wire 10, which is called one winding circumference; due to its own elasticity, the outer winding wire 11 will closely adhere to the annular core wire 10. When the winding pitches are the same, the outer winding wire 11 of the second winding circumference will closely adjoin the outer winding wire 11 of the first winding circumference, and the outer winding wire 11 of the third winding circumference will closely adjoin the outer winding wire 11 of the second winding circumference, and so on. This will result in fewer winding gaps 12 between the outer winding wires 11 of the cable-type bead, which is not conducive to rubber penetration.

[0037] As Figure 1 The winding schematic diagram of the cable-type bead in the prior art provided. The outer winding wire 11 moves circumferentially around the core wire 10 and also spirally winds around the core wire 10 itself. As Figure 1 -(1), the outer winding wire 11 advances helically along the circumference of the annular core wire 10 by one pitch, that is Figure 1 the arc length of the annular core wire 10 corresponding to the α angle in, which is called one winding pitch L1. If the outer winding wire 11 advances another pitch, an adjacent winding pitch L1 will be formed. The outer winding wire 11 winds and advances along the circumference of the annular core wire 10 by one circumferential length of the core wire 10, which is called one winding circumference C0. As Figure 1 -(2), after winding the first winding circumference, the outer winding wire 11 starts to wind the second winding circumference. The outer winding wires 11 wound on one layer are the same wire, just corresponding to the corresponding winding circumferences. Then it starts to wind the third winding circumference, and so on, as Figure 1 -(3), until all windings are completed. Winding gaps 12 etc. will be formed between one winding pitch and an adjacent winding pitch, but within one winding pitch, the outer winding wire 11 wound in one week and the outer winding wire 11 wound in the second week are closely adjoined together, and almost no winding gap 12 can be left, and rubber cannot penetrate.

[0038] Embodiment 1:

[0039] This embodiment provides a cable-type bead, which includes an annular core wire 10. At least one layer of outer winding wires 11 is spirally wound around the outer periphery of the core wire 10. At least one winding pitch on the first winding cycle of the at least one layer of outer winding wires 11 is different from the adjacent winding pitch. That is, at least one outer winding wire 11 is spirally wound around the outer periphery of the core wire 10, so that the outer periphery of the core wire 10 is covered with a layer of this outer winding wire 11, and the state of this layer is obtained by periodically winding one outer winding wire 11. If there are multiple layers of outer winding wires 11 wound around the core wire 10, the winding directions of each layer of outer winding wires 11 are the same or opposite. Secondly, at least one winding method with a winding pitch different from the adjacent winding pitch is set according to requirements in the first winding cycle, and the winding method in the subsequent layer is arranged correspondingly following the winding method of the first winding cycle.

[0040] Selection of the outer winding wire 11 and the core wire 10:

[0041] A copper layer / zinc layer / brass layer / bronze layer / organic coating is covered on the outer winding wire 11; the tensile strength of the outer winding wire 11 is above 2000 MPa; the diameter selection range of the outer winding wire 11 is 0.80 - 3.00 m.

[0042] The core wire 10 is made of a metal material or a non-metal material; the diameter selection range of the core wire 10 is 1.00 - 6.00 mm.

[0043] Preferably, the value range of the length L2 of any winding pitch and the length L1 of the adjacent winding pitch on the outer winding wire 11 is: The value range of the length L2 of any winding pitch and the length L1 of the adjacent winding pitch on the outer winding wire 11 is: This value range can avoid the following situations:

[0044] If the difference between the length L2 of the set different winding pitches and the length L1 of the adjacent winding pitch is too small, many winding gaps cannot be obtained. If the difference between the length L2 of the set different winding pitches and the length L1 of the adjacent winding pitch is too large, then one of the winding pitches L1 and L2 must be too large or too small. When one is too large, the force of the outer winding wire fitting on the core wire is small and the fitting is not tight. When one is too small, the force of the outer winding wire fitting on the core wire is large and the core wire is distorted.

[0045] The winding methods outlined above include: each winding pitch on at least one layer of outer winding wires 11 is different from the adjacent winding pitch; or, at least one winding pitch on any layer of the outer winding wires 11 is different from the adjacent winding pitch. In addition, without departing from the technical principle of the present invention, several improvements and deformations can be made to the winding method, and these improvements and deformations should also be regarded as the protection scope of the present invention.

[0046] Embodiment Two:

[0047] Combined with Example 1, this example provides a cable-type bead. The structure of the cable-type bead is 1×3.00+(10)×1.30. That is, the core wire 10 has a diameter of 3.00 mm; the outer winding wire 11 has a diameter of 1.30 mm; there are a total of 10 winding circumferences. The number of winding twist pitches in each winding circumference is 6, namely winding twist pitch 1, winding twist pitch 2, winding twist pitch 3, winding twist pitch 4, winding twist pitch 5, and winding twist pitch 6. The 6 winding twist pitches are adjacent to each other in pairs. Since they are wound around the annular core wire 10, therefore, winding twist pitch 6 is also adjacent to winding twist pitch 1. As shown in Table 1 below, in Experiment 1, only one winding twist pitch 2 is set to be different from the adjacent winding twist pitches 2 and 3. Each winding twist pitch in Example 2 is different from the adjacent winding twist pitches.

[0048] The rubber permeability is evaluated by the air retention rate under vulcanization conditions. The cable-type bead is coated with rubber and vulcanized. The rubber-coated cable-type bead is equally divided, and the number of divided segments is the number of winding twist pitches, that is, it is equally divided into 6 segments. Each segment of the cable-type bead is tested for air retention rate by the pressure drop method, and then the average value is calculated. The higher the average value of the obtained air retention rate, the highest value being 1. The closer it is to 1, the better the rubber permeability.

[0049] For the prior art cable-type bead 1×3.00+(10)×1.30 with the same structure, the 6 winding twist pitches are all the same. In this example, Experiment 1 and Experiment 2 are used to conduct a comparative test with Comparative Example 1 of the prior art. The test results are shown in Table 1.

[0050] Table 1

[0051]

[0052]

[0053] As can be seen from Table 1, when comparing the average air retention rate under vulcanization conditions with Comparative Example 1 of the prior art, the air retention rates of Experiment 1 and Experiment 2 are better, indicating that Experiment 1 and Experiment 2 have better rubber permeability. Secondly, for Experiment 1 where only one winding twist pitch 2 is set to be different from the adjacent winding twist pitches 2 and 3 and Experiment 2 where each winding twist pitch is different from the adjacent winding twist pitches; it can be seen from the test results in Table 1 that Experiment 2 has better rubber permeability. The number of adjacent winding twist pitches selected to be different is set according to the actual situation.

[0054] Example 3

[0055] Combining Embodiment 1 and Embodiment 2, this embodiment provides a cable-type bead. The structure of the cable-type bead is 2.15+(7+13)×1.55. That is, the core wire 10 has a diameter of 2.15 mm, the outer winding wire 11 has a diameter of 1.55 mm, and it is wound in 2 layers. The first layer has a total of 7 winding circumferences, and the second layer has a total of 13 winding circumferences. The number of winding pitch numbers in the first layer is 6, and the number of winding pitch numbers in the second layer is 6. Among them, the winding pitch 2 in the first layer of Test 3 is different from the adjacent winding pitch, and the winding pitch 2 in the second layer is different from the adjacent winding pitch. In Experiment 4, each winding pitch in the first layer is different from the adjacent winding pitch, and each winding pitch in the second layer is different from the adjacent winding pitch.

[0056] For the prior art cable-type bead 2.15+(7+13)×1.55 with the same structure, the 6 winding pitch numbers in the first layer are all the same, and the 6 winding pitch numbers in the second layer are all the same. In this embodiment, Test 3 and Test 4 are compared with the comparative example of the prior art in a comparative test, and the test results are shown in Table 2.

[0057] Table 2

[0058]

[0059]

[0060]

[0061]

[0062] As can be seen from Table 2, when comparing the average air retention rate under vulcanization conditions with Comparative Example 2 of the prior art, the air retention rates of Test 3 and Test 4 are better, indicating that Test 3 and Test 4 have better rubber permeability. Combining Table 1 in Embodiment 1 and comparing Test 3 and Test 4 with each other, it can also be judged that each winding pitch on the outer winding wire 11 is different from the adjacent winding pitch, and the air retention rate under vulcanization conditions in multiple winding layers is also relatively high.

[0063] Embodiment 4:

[0064] Combining Figure 2 and Figure 3 , this embodiment provides a method for manufacturing the cable-type bead described in any one of the above embodiments, including

[0065] Step 1: Use wire to make a ring-shaped core wire 10.

[0066] Step 2: The prefabricated outer winding wire 11 is in a loop shape, and the outer winding wire 11 is wound around the core wire 10 for a length of one layer. Among them, the loop shape is set such that within the first periodic length of winding the core wire 10, there is at least one outer winding loop with a loop size different from that of the adjacent loop, and subsequent periodic windings are arranged correspondingly along the arrangement mode of the previous period. That is, in the first layer, the second layer, or the nth layer, the winding period is set to have one or more outer winding loops with a loop size different from that of the adjacent loop in the first period. After winding one week according to this setting, the winding mode of the second period will follow the loop setting and distribution position of the first period for winding.

[0067] Combined with Figure 3 Schematic diagram of the outer winding wire 11 in a method for manufacturing a cable-type bead provided, the outer winding wire 11 obtains a natural loop shape in Step 2. A1 is the distance between two adjacent outer winding loops, and the length of the outer winding wire 11 corresponding to A1 is called the circumference C1 of the outer winding loop. The length of the outer winding wire 11 corresponding to A2 is called the circumference C2 of the outer winding loop with a different loop shape. The circumference C2 of the outer winding loop is different from the circumference C1 of the outer winding loop. A3 is the distance between the circumferences C2 of two adjacent outer winding loops, and the length of the outer winding wire 11 corresponding to A3 is called the periodic distance length L0 of the appearance of the outer winding loop with a different loop shape (the outer winding loop with the circumferences C2 of two adjacent outer winding loops).

[0068] Preferably, the value range of the loop circumference C2 of any outer winding loop on the outer winding wire 11 and the circumference C1 of the adjacent loop is: This value range is for obtaining the value of the length L2 of one winding pitch and the length L1 of the adjacent winding pitch in Embodiment 1, so that there are gaps in the cable-type bead after winding, which is convenient for rubber to penetrate and combine; there is a corresponding relationship between the loop circumference and the winding pitch. The larger the loop circumference, the larger the winding pitch, and the smaller the loop circumference, the smaller the winding pitch. If it is not the corresponding situation, it will cause a large stress on the outer winding wire and twist the core wire.

[0069] Preferably, the distance length between two adjacent outer winding loops with a loop circumference of C2 is L0, and the value range of L0 is: 2·L1 ≤ L0 ≤ C0, where L1 is the winding pitch of the outer winding loop with a loop circumference of C1; C0 is the circumference of one loop of the core wire 10 when the outer winding wire 11 spirally winds forward along the circumferential direction of the core wire 10. L0 refers to Figure 3 the length of the outer winding wire corresponding to A3 in it. L0 is not equal to A3, but the fully straightened length of the outer winding wire. 2L1 ≤ L0 is to make the distance between two different loop circumferences C2 larger, otherwise the winding gap may not be obvious. L0 ≤ C0 is to ensure that there is one C2 within each C0.

[0070] Step 3: Spirally wind the preformed loop-shaped outer winding wire 11 around the core wire 10. According to the set loop size of the outer winding wire 11 and the differences between adjacent loops, different winding pitches exist for the outer winding wire 11 wound around the core wire 10, thereby forming a uniform winding gap 12.

[0071] Step 4: After the preformed loop-shaped outer winding wire 11 is spirally wound around the core wire 10 for one layer, use a joint to fix the head and tail of the outer winding wire 11 together to obtain a cable-type bead that has been successfully wound for one layer.

[0072] Step 5: Repeat Steps 2 to 4 to obtain multiple layers of cable-type beads.

[0073] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principles of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A cable-type bead, characterized in that, It includes a ring-shaped core wire; at least one layer of outer winding wires are spirally wound around the outer periphery of the core wire; at least one winding pitch is different from adjacent winding pitches within the first winding period of at least one layer of the outer winding wires.

2. The cable-type bead according to claim 1, characterized in that, Each winding pitch of at least one layer of the outer winding wires is different from adjacent winding pitches.

3. The cable-type bead according to claim 1, characterized in that, At least one winding pitch of any layer of the outer winding wires is different from adjacent winding pitches.

4. The cable-shaped bead according to claim 1, characterized in that, The value ranges of the length L2 of any winding pitch and the length L1 of an adjacent winding pitch on the outer winding wire are as follows:

5. The cable-type bead according to claim 4, characterized in that, The value ranges of the length L2 of any winding pitch and the length L1 of an adjacent winding pitch on the outer winding wire are as follows:

6. The cable-shaped bead according to claim 1, characterized in that, When there are at least two layers of outer winding wires, the winding direction of each layer of the outer winding wires is the same.

7. The cable-type bead according to claim 1, characterized in that, When there are at least two layers of outer winding wires, the winding direction of each layer of the outer winding wires is opposite.

8. The cable-type bead according to claim 1, characterized in that, The diameter of the core wire is 1.00 - 6.00 mm.

9. The cable-type bead according to claim 8, characterized in that, The diameter of the outer winding wire is 0.80 - 3.00 mm.

10. The cable-shaped bead according to claim 1, characterized in that, A copper layer is covered on the outer winding wire; or a zinc layer; or a brass layer; or a bronze layer; or an organic coating.

11. The cable-type bead according to claim 1, characterized in that, The tensile strength of the outer winding wire is above 2000 MPa.

12. The cable-type bead according to claim 1, characterized in that, The core wire is made of a metal material or a non-metal material.

13. A method for manufacturing the cable-type bead according to any one of claims 1 to 12, comprising: Step 1: Using a wire to make a ring-shaped core wire; Step 2: Preparing the outer winding wire into a loop shape, and making the outer winding wire wind around the core wire for a length of one layer; wherein, the loop shape is set such that at least one loop size of the outer winding wire loop is different from adjacent loop sizes within the first winding periodic length of winding the core wire, and subsequent periodic windings are arranged correspondingly along the arrangement mode of the previous period; Step 3: Spirally winding the preformed loop-shaped outer winding wire around the core wire. According to the different loop sizes of the outer winding wire and adjacent loops, there are different winding pitches for the outer winding wire wound around the core wire, thereby forming a uniform winding gap; Step 4: After the preformed loop-shaped outer winding wire is spirally wound around the core wire for one layer, fixing the head and tail of the outer winding wire together with a joint to obtain a single-layer cable-type bead; Step 5: Repeating Step 2 to Step 4 to obtain a multi-layer cable-type bead.

14. The manufacturing method of the cable-shaped bead according to claim 13, characterized in that, The value range of the loop circumference C2 of any outer winding wire loop on the outer winding wire and the circumference C1 of the adjacent loop is:

15. The manufacturing method of the cable-shaped bead according to claim 14, characterized in that, The distance length between two adjacent different outer winding wire loops with a loop circumference of C2 is L0, and the value range of L0 is: 2·L1 ≤ L0 ≤ C0, where L1 is the winding pitch of the outer winding wire loop with a loop circumference of C1; C0 is the circumference of the outer winding wire advancing one core wire ring along the circumferential direction of the core wire in a spiral winding.

16. A tire, characterized in that, It includes the cable-type bead according to any one of claims 1 to 12.

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