Cable type bead

Abstract

The application belongs to the technical field of tire skeleton material, and discloses a cable type bead, which comprises a core wire and an outer winding wire spirally wound outside the core wire; at least one layer of the outer winding wire is a non-metal wire layer; the diameter D1 of the non-metal wire layer is different from the diameter D2 of the metal wire layer, and D1>D2; the outer winding wire is multilayered, the diameters D1 of all the non-metal wire layers are the same, and the diameters D2 of all the metal wire layers are the same; and the rubber permeability is improved, the friction between the layers of the outer winding wire is reduced, and the service life of the tire is prolonged.

Description

Technical Field

[0001] This invention relates to the field of tire carcass materials technology, and in particular to a cable-type tire bead. Background Technology

[0002] As the skeleton material of a tire, the bead plays a crucial role. Cable-type bead is favored by major tire manufacturers due to its excellent performance (such as high strength, uniform stress distribution, and stable shape).

[0003] A cable bead consists of a core wire and two or more outer layers spirally wound around it. During use, the cable bead is placed inside the tire and vulcanized together with the rubber, making them a unified whole. To facilitate rubber penetration, gaps exist in the spirally wound outer layers. Higher penetration rates result in stronger integration between the rubber and the cable bead, reducing air infiltration and minimizing corrosion of the metal wires by moisture. However, higher penetration rates also mean larger gaps in the spirally wound outer layers, resulting in fewer steel wires and reduced cable bead strength. Therefore, a balance must be struck between the cable bead's strength and penetration rate.

[0004] In addition, when the tire bead is subjected to force, the relative positions of each steel wire will change, such as twisting or bending at a certain angle, causing point contact friction between the metal wire layers. If the friction time is too long, it will lead to the metal wire breaking and failure.

[0005] In existing cable-type tire bead technology, the outer layer winding thread generally uses metal wire of the same specification, and the metal wires are arranged in a tight structure. This reduces the rubber permeability to a certain extent, reduces the firmness between the rubber and the cable-type tire bead, increases the probability of corrosion of the cable-type tire bead, and increases the probability of point contact friction between the metal wire layers, thus reducing the service life of the cable-type tire bead.

[0006] Patent CN 105415986 A discloses a tire and its cable-type bead. The outer winding layer of the cable-type bead increases the wire diameter from the inside out to improve the bead's load-bearing capacity and reduce its weight. This technology addresses the problem of reducing bead weight while maintaining its load-bearing capacity. However, the inventors have found that increasing the wire diameter from the inside out has the following problems: 1. Thin inner winding wires result in low wear resistance and short service life; 2. Thin inner winding wires lead to a large number of windings and high winding density, resulting in poor adhesive penetration; 3. When the outer winding is multi-layered, the various wire diameters necessitate continuous adjustments to the processing technology, increasing production difficulty, reducing production efficiency, and increasing production costs.

[0007] Patent CN 104349916 A discloses a lighter hybrid bead thread for tires, the core of which includes at least one yarn of multifilament textile fibers embedded in an organic matrix. The fibers may be selected from aramid fibers, but the fibers are used for the core thread, and the main purpose of adding the fibers is to reduce the weight of the hybrid bead. Summary of the Invention

[0008] In view of this, the present invention proposes a cable-type tire bead, wherein at least one layer of the outer winding is a non-metallic wire layer, and the diameter of the non-metallic wire layer is different from that of the metallic wire layer. This structural design improves the rubber permeability, reduces the friction between layers, and extends the service life of the tire.

[0009] The technical solution of this invention is implemented as follows:

[0010] The present invention provides a cable-type tire bead, comprising a core wire and an outer winding wire spirally wound around the core wire; at least one layer of the outer winding wire is a non-metallic wire layer; the diameter D1 of the non-metallic wire layer in the outer winding wire is different from the diameter D2 of the metallic wire layer, and D1 > D2; the outer winding wire is multi-layered, and the diameter D1 of all non-metallic wire layers is the same, and the diameter D2 of all metallic wire layers is the same.

[0011] By incorporating a non-metallic wire layer in the outer winding, the porosity between adjacent metallic wire layers is increased, thereby improving the rubber permeability of the cable bead, enhancing the bond between the rubber and the cable bead, reducing the probability of corrosion of the cable bead and point contact friction between the metallic wire layers, and extending the service life of the cable bead.

[0012] Preferably, the non-metallic wire layer is aramid wire, or it can be aramid cord. The weight-to-tensile strength of aramid wire or aramid cord is only 1 / 6 that of steel wire; however, the strength of aramid wire or aramid cord can be comparable to that of steel wire of the same diameter. But the processing technology of aramid wire or aramid cord with this strength is more complicated and the production cost is higher. Therefore, in order to reduce the production cost, the strength of the aramid wire or aramid cord used in this invention is slightly lower than that of steel wire of the same diameter.

[0013] Preferably, in conventional cable-type beaded tires of the same specification, the normal diameter of the outer winding thread is D, the diameter of the non-metallic wire layer of the present invention is D1, and the diameter of the metallic wire layer is D2, then D1 > D > D2. The aforementioned normal diameter of the outer winding thread refers to the diameter of the outer winding thread conventionally used in the prior art.

[0014] Because non-metallic wire layers are used instead of the original metallic wire layers, the overall strength of the cable bead may be reduced. Therefore, in order to ensure the strength of the cable bead, the diameter of the metallic wire layers is reduced, thereby increasing the number of metallic wires in each metallic wire layer. By increasing the number of metallic wires, the strength of the cable bead is ensured not to decrease.

[0015] Further preferred option, D <D1<1.5D;D> D2>0.7D; In order to ensure that the cross-sectional diameter of the cable bead does not change much and to avoid the tire factory from modifying the equipment, it is necessary to control the diameter of the non-metallic wire layer and the diameter of the metallic wire layer. If the diameter of the non-metallic wire layer is too large, the diameter of the metallic wire layer needs to be too small. If the diameter of the metallic wire layer is too small, it will result in too many metallic wires and too small gaps between the metallic wires, which will reduce the rubber permeability of the cable bead.

[0016] Further preferably, the sum of the diameters of the non-metallic and metallic wire layers is A, and the sum of the normal diameters of the multiple outer windings in a conventional cable-type bead of the same specification is B, where 0.8 ≤ A / B ≤ 1.2. Because the sum of the wire diameters between the metallic and non-metallic wire layers in a cable-type bead is comparable to the sum of the outer wire diameters in a conventional cable-type bead, the cable-type bead has a comparable cross-sectional diameter and breaking strength to the conventional cable-type bead; and tire manufacturers can use cable-type beads without any modifications or only minor adjustments. The aforementioned sum of the normal diameters of the multiple outer windings refers to the sum of the diameters of the multiple outer windings after multiple layers of winding, as conventionally used in the prior art.

[0017] In a further preferred embodiment, the innermost layer of the outer winding is a metal wire layer; the metal wire layer is in contact with the core wire, which can improve the adhesion between the core wire and the outer winding, and improve the quality of the cable-type bead.

[0018] Preferably, when using multiple non-metallic wire layers to replace metallic wire layers, the multiple non-metallic wire layers are arranged adjacently or alternately.

[0019] More preferably, the multiple non-metallic wire layers are arranged alternately; since the friction between the metal wire layers and the non-metallic wire layers is lower than the friction between the metal wire layers, the alternating arrangement helps to extend the service life of the tire.

[0020] The method for preparing the cable-type bead of this invention is as follows:

[0021] (1) Use metal wire to make the core coil;

[0022] (2) Prepare non-metallic wire and metallic wire for winding the outer layer. The diameter of the non-metallic wire is D1 and the diameter of the metallic wire is D2.

[0023] (3) The metal or non-metal wire is spirally wound around the core ring made in step (1) with a certain twist direction and a certain twist pitch to obtain a cable-type tire bead.

[0024] The cable-type tire bead of the present invention has the following advantages over the prior art:

[0025] 1. By layering metal and non-metal cord layers, the porosity between the metal layers is increased while ensuring the breaking strength of the outer layer. This increases the rubber permeability of the cable bead, improves the bond between the rubber and the cable bead, and reduces the probability of corrosion of the cable bead. The non-metal cord layers reduce the friction between adjacent cord layers and extend the tire's service life.

[0026] 2. Although the non-metallic wire layer can increase the rubber permeability and reduce the friction between adjacent wire layers, it may reduce the strength of the cable bead. Therefore, by reducing the diameter of the metallic wire layer and increasing the number of metallic wires in each metallic wire layer, the strength of the cable bead can be kept constant.

[0027] 3. Since the diameter of the metal wire layer is reduced, the cross-sectional diameter of the cable bead becomes smaller. In order to keep the cross-sectional diameter of the cable bead from changing too much and to avoid the tire factory from modifying equipment and increasing costs, the diameter of the non-metallic wire layer is increased. That is, the sum of the diameters of the non-metallic wire layer and the metal wire layer is A, and the sum of the normal diameters of the outer winding wire is B, 0.8≤A / B≤1.2.

[0028] 4. By reducing the diameter of the metal wire layer and increasing the diameter of the non-metal wire layer, the strength and cross-sectional diameter of the cable-type bead remain essentially unchanged. However, the diameter of the metal wire layer cannot be too small, and the diameter of the non-metal wire layer cannot be too large. Therefore, the control range is D. <D1<1.5D;D> D2>0.7D.

[0029] 5. Due to the addition of non-metallic wire layers, the weight of cable-type bead can be reduced by 15-60% compared to that of conventional cable-type bead. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a cross-sectional view of the cable-type tire bead in Embodiment 1 of the present invention; Figure 1 In the middle, the core ring is 11, the non-metallic wire is 12, and the metallic wire is 13.

[0032] Figure 2 This is a cross-sectional view of the cable-type tire bead in Embodiment 2 of the present invention; Figure 2In the middle, there is a core ring 21, a first layer of non-metallic wire 22, a second layer of metallic wire 23, a third layer of non-metallic wire 24, and a fourth layer of metallic wire 25. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1:

[0035] Taking the double-layer product 1x3.0+(9+15)x1.50 as an example, the cable-type bead structure is: 1x3.0+(8)x1.80+(18)x1.30, where the +8 layer is a non-metallic wire layer.

[0036] (1) Use 3.0mm diameter metal wire to make the core coil, such as Figure 1 The inner diameter of core ring 11 is 471mm;

[0037] (2) Prepare non-metallic wire and metallic wire for winding the outer layer. The diameter of non-metallic wire 12 is 1.80mm and the diameter of metallic wire 13 is 1.30mm.

[0038] (3) The sum of the diameters of the non-metallic outer layer and the metallic outer layer, A, is 1.80x2 + 1.30x2 = 6.20mm. The sum of the diameters of the outer layers of the conventional cable-type tire bead, B, is 1.50x4 = 6.00mm. A / B = 6.20 / 6.00 = 1.03; D1 / D = 1.8 / 1.5 = 1.2; D2 / D = 1.3 / 1.5 = 0.87.

[0039] (4) The non-metallic wire 12 with a diameter of 1.80 mm is spirally wound around the 3.0 mm core ring 11 made in step (1) with a twist direction of Z and a twist pitch of 165 mm, for a total of 8 turns;

[0040] (5) A metal wire 13 with a diameter of 1.30 mm is spirally wound onto the non-metal wire 12 made in step (4) with a twist direction of S and a twist pitch of 165 mm, for a total of 18 turns.

[0041] The following table summarizes some data from Example 1 and the conventional example:

[0042] Table 1

[0043]

[0044] Example 2:

[0045] Taking the four-layer product 1x5.0+(11+17+23+29)x1.80 as an example, the cable-type bead structure is: 1x5.0+(10)x2.10+(21)x1.50+(20)x2.10+(36)x1.50, where the +10 layer and the +20 layer are non-metallic wire layers.

[0046] (1) Use 5.0mm diameter metal wire to make the core coil, such as Figure 2 The inner diameter of the core ring 21 is 551.6 mm;

[0047] (2) Prepare non-metallic wires and metallic wires for winding the outer layer. The wire diameter of the first layer non-metallic wire 22 and the third layer non-metallic wire 24 is 2.10mm, and the wire diameter of the second layer metallic wire 23 and the fourth layer metallic wire 25 is 1.50mm.

[0048] (3) The sum of the diameters of the non-metallic outer layer and the metallic outer layer, A, is 4x2.10+4x1.50=14.40mm. The sum of the diameters of the outer layers of the conventional cable-type tire bead, B, is 1.80x8=14.40mm. A / B=14.40 / 14.40=1; D1 / D=2.1 / 1.8=1.17; D2 / D=1.5 / 1.8=0.83.

[0049] (4) The first layer of non-metallic wire 22 with a diameter of 2.10 mm is spirally wound around the 5.0 mm core ring 21 made in step (1) with a twist direction of Z and a twist pitch of 192 mm, for a total of 10 turns;

[0050] (5) The second layer of metal wire 23 with a diameter of 1.50 mm is spirally wound around the first layer of non-metal wire 22 made in step (4) with a twist direction of S and a twist pitch of 192 mm, for a total of 21 turns;

[0051] (6) The third layer of non-metallic wire 24 with a diameter of 2.10 mm is spirally wound around the second layer of metallic wire 23 made in step (5) with a twist direction of Z and a twist pitch of 192 mm, for a total of 20 turns;

[0052] (7) The fourth layer of metal wire 25 with a diameter of 1.50 mm is spirally wound onto the third layer of non-metal wire 24 made in step (6) with a twist direction of S and a twist pitch of 192 mm, for a total of 36 turns.

[0053] The following table summarizes some data from Example 2 and the conventional example:

[0054] Table 2

[0055]

[0056] Example 3:

[0057] Taking the three-layer product 1x1.6+(6+12+18)x1.40 as an example, the cable-type bead structure is: 1x1.60+(6)x1.30+(11)x1.50+(20)x1.30, where the +11 layer is a non-metallic wire layer.

[0058] (1) Use metal wire with a diameter of 1.60mm to make the core ring, and the inner diameter of the core ring is 450.96mm;

[0059] (2) Prepare non-metallic wire and metallic wire for winding the outer layer. The diameter of the non-metallic wire is 1.50mm and the diameter of the metallic wire is 1.30mm.

[0060] (3) The sum of the diameters of the non-metallic outer layer and the metallic outer layer, A, is 2x1.5+4x1.30=8.20mm. The sum of the diameters of the outer layers of the conventional cable-type tire bead, B, is 1.40x6=8.40mm. A / B=8.20 / 8.40=0.98; D1 / D=1.5 / 1.4=1.07; D2 / D=1.3 / 1.4=0.93.

[0061] (4) A metal wire with a diameter of 1.30 mm is spirally wound around the 1.60 mm core ring made in step (1) with a twist direction of S and a twist pitch of 154 mm, for a total of 6 turns;

[0062] (5) A non-metallic wire with a diameter of 1.50 mm is spirally wound around the outer layer of the metallic wire made in step (4) with a twist direction of Z and a twist pitch of 173 mm, for a total of 11 turns;

[0063] (6) A metal wire with a diameter of 1.30 mm is spirally wound around the outer layer of the non-metallic wire made in step (5) with a twist direction of S and a twist pitch of 173 mm, for a total of 20 turns;

[0064] The following table summarizes some data from Example 3 and the conventional example:

[0065] Table 3

[0066]

[0067] As can be seen from the data in Tables 1, 2, and 3, the cable-type bead in Examples 1, 2, and 3 has a comparable structure and breaking strength to the conventional examples. This ensures that the cable-type bead of the present invention possesses the structural regularity and stability of a conventional cable-type bead, allowing tire manufacturers to use it without any modifications or with only minor modifications. Furthermore, the superposition of metal and non-metal wire layers of different diameters in the cable-type bead of the present invention increases the porosity between the metal layers while maintaining the breaking strength of the outer layer, thereby improving the rubber permeability of the cable-type bead. Due to the addition of the non-metal wire layer, the cable-type bead is significantly lighter than a conventional cable-type bead.

[0068] Comparative Example 1

[0069] Based on Example 2, the wire diameters of both the first layer non-metallic wire 22 and the third layer non-metallic wire 24 are changed to 3mm, while other conditions remain the same:

[0070]

[0071] The data in the table shows that when D1 is greater than 1.5D, the cross-sectional diameter of the cable-type bead in Comparative Example 1 increases significantly, and the weight also increases substantially. Increasing the cross-sectional diameter is detrimental to tire manufacturing operations, and the increased weight contradicts the trend towards lightweight tires.

[0072] Comparative Example 2

[0073] Based on Example 2, the wire diameters of the second layer metal wire 23 and the fourth layer metal wire 25 are both changed to 1mm, while other conditions remain the same:

[0074]

[0075] The data in the table shows that when D2 is less than 0.7D, the cable-type bead in Comparative Example 2 is no longer comparable to the original cable-type bead. Although the cross-sectional diameter and weight are greatly reduced, the rubber penetration capacity is greatly reduced due to the excessively thin diameter of the metal winding wire, which leads to a significant increase in pressure drop.

[0076] Comparative Example 3

[0077] Based on Example 2, the diameter of both the non-metallic wire and the metallic wire is 1.8 mm, and other conditions remain the same:

[0078]

[0079] The data in the table shows that when D1=D2=D:

[0080] Compared with Example 2, Comparative Example 3 showed a significant increase in the weight of the cable-type bead, while reducing the porosity between the metal layers and decreasing the rubber permeability of the cable-type bead.

[0081] Compared with the conventional example (all outer layers are metal wires), although the weight of the cable-type bead in Comparative Example 3 was significantly reduced, the porosity inside the cable-type bead did not improve at all when the same diameter was replaced. Therefore, the rubber permeability of the cable-type bead remained unchanged, which means it has a high pressure drop.

[0082] Comparative Example 4

[0083] Based on Example 2, the diameter of the non-metallic wire was changed to 1.5 mm, and the diameter of the metallic wire was changed to 2.1 mm, while other conditions remained the same:

[0084]

[0085] The data in the table shows that when the diameter of the winding thread does not conform to D1 > D > D2, although the rubber penetration ability of the cable-type bead is also strong, the weight and breaking strength of the cable-type bead are not as advantageous as when D1 > D > D2.

[0086] Comparative Example 5

[0087] Based on Example 3, the diameter of the outermost metal wire was changed to 1.60 mm, that is, the diameter of the winding wire increases from the inside to the outside, while keeping other conditions the same:

[0088]

[0089] The data in the table shows that while the weight of the cable bead decreases as the diameter of the winding thread increases from the inside to the outside, the reduction is relatively small. This is because three different diameter winding threads are used in the production of the cable bead, requiring constant thread changes during production. Consequently, the average winding time increases significantly, and production efficiency decreases substantially.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cable-type tire bead, characterized in that: Includes the core wire and the outer winding wire wrapped around the core wire; At least one layer of the outer winding is a non-metallic wire layer; The diameter D1 of the non-metallic wire layer in the outer winding is different from the diameter D2 of the metallic wire layer, and D1 > D2; The outer winding wire is multi-layered, with the same diameter D1 between all non-metallic wire layers and the same diameter D2 between all metallic wire layers. The diameter of the non-metallic wire layer is D1, and the diameter of the metallic wire layer is D2. In the same specification of conventional cable-type tire bead, the normal diameter of the outer winding wire is D, so D1 > D > D2. D <D1<1.5D;D> D2>0.7D; The sum of the diameters of the non-metallic wire layer and the metallic wire layer is A; In a conventional cable-type tire bead of the same specification, the sum of the normal diameters of the multiple outer windings is B, where 0.8 ≤ A / B ≤ 1.

2.

2. The cable-type tire bead as described in claim 1, characterized in that: The non-metallic thread layer is aramid thread.

3. The cable-type tire bead as described in claim 1, characterized in that: The innermost layer of the outer winding is a metal wire layer.

4. The cable-type tire bead as described in claim 3, characterized in that: When using multiple non-metallic wire layers to replace metallic wire layers, the multiple non-metallic wire layers are arranged adjacently or alternately.

5. The cable-type tire bead as described in claim 4, characterized in that: The multilayer non-metallic wires are arranged in an alternating pattern.

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