Winter tire with discontinuous winding cap ply

Abstract

The invention relates to the field of tire manufacturing, and discloses a winter tire with a discontinuous winding cap ply, the tire comprises a tread, a winding cap ply, a belted layer, a tire body, a sidewall and a tire bead, the belted layer is attached to the tire body, the winding cap ply is arranged on the belted layer, the cap tension of the winding cap ply adopts a segmented control design, and the width of the winding cap ply is smaller than that of the tread. The winding cap ply is formed by spirally winding a single nylon strip from a first shoulder part of the tire to a second shoulder part of the tire, the winding cap ply of the tire crown part is spirally wound at intervals, and the interval between every two circles of wound cap plies is 1-3mm. By means of the design of the winding cap ply, segmented control over the tension of the cap ply is achieved, the problem of uneven abrasion of the winter tire under high-speed running or complex road conditions is solved, the durability, the ground gripping performance, the control performance, the bearing capacity, the safety and the comfort of the winter tire are improved, and the service life of the winter tire is prolonged; the weight of the tire in winter is reduced, and the cost for winding the cap ply is reduced.

Description

Technical Field

[0001] The invention relates to the field of tire manufacturing, in particular to a winter tire with a discontinuously wound cap layer. Background Art

[0002] The belt layer in the tire is radially arranged between the carcass and the tread, and is the main force-bearing component of the tire. The belt layers are cross-structured and form a certain angle with the center of the tread. When the tire of this structure is inflated and driven, the hoop effect of the belt layer in the shoulder area on the tire will be smaller than that in the middle area of ​​the tread. Therefore, when the tire is running, the radial expansion of the shoulder area of ​​the tire is greater than that of the middle area of ​​the tire, resulting in relatively greater circumferential deformation of the shoulder area of ​​the tire during driving, resulting in higher heat generation at the shoulder position, and the problem of delamination or cracking between the belt layer and the tread rubber is prone to occur.

[0003] In order to suppress the circumferential deformation of the tire during use, most tires on the market currently have added a winding cap layer to improve the tire's ground contact performance and increase the tire's durability, high-speed performance and service life.

[0004] A Chinese invention patent (publication number: CN108638756B, publication date: 2024-02-09) discloses a heavy-duty radial tire with a folded multi-layer winding structure, the tire comprising a tread, a carcass, a belt layer, and a bead, the belt layer consisting of a 1# belt layer, a 2# belt layer, a 0-degree belt layer, and a 3# belt layer; the 1# belt layer is arranged at the radial innermost side and is bonded to the carcass; the 2# belt layer is arranged on the 1# belt layer, in the opposite direction to the 1# belt layer; a 0-degree belt layer is arranged on the 2# belt layer, and the entire 0-degree belt layer adopts a single cord strip to be folded back and wound in multiple layers on one shoulder, and then wound in a single layer or multiple layers to the other shoulder for folding and winding in multiple layers; at the radial outermost side, on the 0-degree belt layer, a 3# belt layer is bonded, in the opposite direction to the 2# belt layer.

[0005] Chinese invention patent (publication number: CN114474809A, publication date: 2022.05.13) A cap strip winding method and a run-flat tire, the cap strip winding method, after winding is completed, forms a three-layer first shoulder, three-layer second shoulder, and two-layer crown, which can improve the rigidity of the shoulder while ensuring the overall rigidity of the crown. Among them, the first shoulder and the second shoulder are both three-layer structures, and the crown is a two-layer structure.

[0006] It can be seen that the traditional tire cap belt design mostly adopts a tightly wound method. Although this method guarantees the performance of the tire to a certain extent, it still has some shortcomings in actual use. For example, when the tire is driving at high speed or under complex road conditions, the shear and heat distribution between the cap belt and the tread are uneven, which can easily lead to uneven tire wear and shorten the service life. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a winter tire with a discontinuously wound cap layer. The wound cap layer design realizes segmented control of the cap layer tension, avoids the problem of uneven wear of the winter tire under high-speed driving or complex road conditions, and improves the durability, grip performance, handling performance, load-bearing capacity, safety, comfort and service life of the winter tire. The design also reduces the weight of the winter tire and reduces the cost of the wound cap layer.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A winter tire with a discontinuous winding cap layer, the tire comprises a tread, a winding cap layer, a belt layer, a carcass, a sidewall and a bead, the belt layer is attached to the carcass, the winding cap layer is arranged on the belt layer, the cap tension of the winding cap layer adopts a segmented control design, the winding cap layer adopts a single nylon spirally wound from the first shoulder of the tire to the second shoulder, wherein the winding cap layer of the crown part adopts an interval spiral winding, and the interval between each winding cap layer is 1-3mm; The specific winding method includes the following steps: starting from the outer edge of the first shoulder and spirally winding to the junction of the first shoulder and the crown, winding one circle and then starting intermittent spiral winding to the junction of the second shoulder and the crown, and then continuing spiral winding to the outer edge of the second shoulder.

[0009] In simple terms, the pitch of the cap layer wound at the first shoulder and the second shoulder is the same, while the pitch of the cap layer wound at the crown part is 1-3 mm larger than the pitch of the cap layer wound at the shoulder.

[0010] Preferably, the cap layer of the crown part is wound in an intermittent spiral manner, and the interval between each circle of the cap layer is 2 mm.

[0011] Preferably, the nylon is 9-11 mm wide and 0.6-1.0 mm thick.

[0012] Preferably, the nylon is 10 mm wide and 0.8 mm thick.

[0013] Preferably, the cap band tension of the crown area is the tension of the tire building machine, and the cap band tension of the first shoulder and second shoulder areas is twice the tension of the tire building machine. The tension of the tire building machine can be 20±5N.

[0014] Preferably, the belt layer includes a 1# belt layer and a 2# belt layer, wherein the 1# belt layer is attached to the carcass and is radially innermost, and the 2# belt layer is attached to the 1# belt layer, and the width of the 2# belt layer is smaller than that of the 1# belt layer.

[0015] The wrapped cap layer design provided by the present invention realizes segmented control of the cap layer tension, thereby making the shear and heat distribution between the cap layer and the tread more uniform, avoiding the problem of uneven wear of winter tires under high-speed driving or complex road conditions, while increasing the shoulder tightening force and improving high-speed durability; enabling the winter tire to better disperse the pressure when bearing a load, thereby improving the load-bearing capacity and safety of the winter tire; reducing the tread rigidity, thereby improving the grip and handling performance of the winter tire on snow while maintaining comparable performance on ice; significantly improving the stability and durability of the cap layer, reducing damage caused by improper winding, being suitable for a variety of road application scenarios, increasing the service life of the winter tire, and improving the comfort of the winter tire as a whole; this design reduces the weight of the winter tire, while reducing the cost relative to the design of full winding or adding a belt layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the winter tire of Example 1.

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the winter tire of Comparative Example 1.

[0018] Figure 3 This is a schematic diagram of the winding method of Example 1.

[0019] Figure 4 Schematic diagram of the winding method of Comparative Example 1.

[0020] Reference numerals: 1 - 1# belt layer, 2 - 2# belt layer, 3 - winding cap layer, 4 - first shoulder, 5 - second shoulder, 6 - crown. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] Example 1 like Figure 1As shown, a winter tire with a discontinuously wound cap layer, the tire includes a tread, a wound cap layer 3, a belt layer, a carcass, a sidewall and a tire bead, the belt layer is attached to the carcass, the belt layer includes a 1# belt layer 1 and a 2# belt layer 2, the 1# belt layer 1 is attached to the carcass and is radially innermost, the 2# belt layer 2 is attached to the 1# belt layer 1, and the width of the 2# belt layer 2 is less than the width of the 1# belt layer 1.

[0024] The winding cap layer 3 is arranged on the belt layer, and the cap tension of the winding cap layer 3 adopts a segmented control design. The winding cap layer 3 adopts a single nylon with a width of 10mm and a thickness of 0.8mm, which is spirally wound from the first shoulder 4 of the tire to the second shoulder 5. Among them, the winding cap layer 3 of the crown 6 part adopts an interval spiral winding, and the interval between each circle of the cap is 2mm. At the same time, the cap tension used is the cap tension of the tire forming machine. In winter, the conventional spiral winding method without interval is adopted in the shoulder area of ​​30mm, and the cap tension used is twice the cap tension of the tire forming machine. Specifically, if Figure 1 , 3 As shown, nylon is spirally wound without intervals from the outer edge of the first shoulder 4 to the junction of the first shoulder 4 and the crown 6, and the cap winding pitch of the first shoulder 4 is 11mm; then one circle is wound to cover the crown 6 for the first time, and the end close to the center of the crown 6 is end a, and from end a, it is spirally wound at intervals to the junction of the second shoulder 5 and the crown 6, and the interval between each circle of the cap is 2mm, that is, the cap winding pitch of the crown 6 is 13mm; then continue to spirally wind without intervals to the outer edge of the second shoulder 5, and the cap winding pitch of the second shoulder 5 is 11mm.

[0025] The cap winding pitch can also be other values, such as 12, 13, etc. The cap winding pitch of the first shoulder 4 and the second shoulder 5 is always the same, while the cap winding pitch of the crown 6 is 1-3mm larger than that of the shoulder.

[0026] Comparative Example 1 The difference from the winter tire of implementation 1 is that Figure 2 As shown, the winding cap layer 3 of the belt layer portion adopts a conventional spiral winding method without intervals.

[0027] The winter tires of Example 1 and Comparative Example 1 were subjected to performance tests under the same conditions. The test results are shown in Tables 1 and 2.

[0028] Table 1 Indoor performance comparison Indoor performance Comparative Example 1 Example 1 high speed 100 100 durable 100 101 Durable low pressure 100 100 Rolling resistance 100 102 Jing Gang 100 98 Horizontal 100 100 Zong Gang 100 97 Torsion rigidity 100 104 Table 2 Outdoor performance comparison Outdoor performance Comparative Example 1 Example 1 Snow handling 100 102 Snow Braking 100 103 Ice Control 100 100 Braking on ice 100 99 It can be seen from Table 1 and Table 2 that, by adopting the interval winding cap layer design, Example 1 has better durability, rolling resistance performance, and rigidity, and thus has better grip performance. At the same time, Example 1 also has better snow handling performance, and the overall performance is slightly better than that of Comparative Example 1. After measurement, the winter tire of Example 1 is 80g lighter than the winter tire of Comparative Example 1.

[0029] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A winter tire with a discontinuously wound cap layer, the tire comprising a tread, a wound cap layer (3), a belt layer, a carcass, a sidewall and a bead, wherein the belt layer is attached to the carcass, and the wound cap layer (3) is arranged on the belt layer, characterized in that: The cap tension of the wound cap layer (3) is designed to be controlled in sections, and the wound cap layer (3) is wound spirally from a first shoulder (4) to a second shoulder (5) of the tire using a single nylon strip, wherein the wound cap layer (3) of the crown (6) is wound in an interval-type spiral manner, and the interval between each wound cap layer is 1-3 mm; The specific winding method comprises the following steps: spirally winding from the outer edge of the first shoulder (4) to the junction of the first shoulder (4) and the crown (6), and then winding one circle and starting to spirally wind at intervals to the junction of the second shoulder (5) and the crown (6), and then continuing to spirally wind to the outer edge of the second shoulder (5).

2. A winter tire with a discontinuously wound cap layer according to claim 1, characterized in that: The winding cap layer (3) of the crown (6) part is wound in an interval spiral manner, and the interval between each winding cap layer is 2 mm.

3. A winter tire with a discontinuously wound cap layer according to claim 1, characterized in that: The nylon has a width of 9-11 mm and a thickness of 0.6-1.0 mm.

4. A winter tire with a discontinuously wound cap layer according to claim 3, characterized in that: The nylon is 10 mm wide and 0.8 mm thick.

5. A winter tire with a discontinuously wound cap layer according to claim 1, characterized in that: The cap band tension of the tread crown (6) region is the tension brought by the tire building machine, and the cap band tension of the first shoulder (4) and the second shoulder (5) region is twice the tension brought by the tire building machine.

6. A winter tire with a discontinuously wound cap layer according to claim 1, characterized in that: The belt layer comprises a 1# belt layer (1) and a 2# belt layer (2), wherein the 1# belt layer (1) is attached to the carcass and is radially innermost, and the 2# belt layer (2) is attached to the 1# belt layer (1), and the width of the 2# belt layer (2) is smaller than the width of the 1# belt layer (1).

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