Winter tire with discontinuous winding cap ply

Abstract

The utility model relates to the field of tire structures, 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 on 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 tire bead. 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. Due to the design of the winding cap ply provided by the utility model, segmented control of the tension of the cap ply is realized, the problem of uneven abrasion of the winter tire under high-speed driving or complex road conditions is avoided, the durability, the grip 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 utility model relates to the field of tire manufacturing, and more specifically, to a winter tire with a discontinuous wound cap ply. Background Art

[0002] The belt plies in a tire are radially arranged between the carcass and the tread, and are the main load-bearing components of the tire. The belt plies have a cross structure between them and form a certain angle with the center of the tread. When a tire with such a structure is inflated and under load during driving, the hoop effect of the belt plies in the shoulder area on the tire is less than that in the middle area of the tread. Therefore, during driving, the radial expansion of the shoulder area of the tire is larger than that of the middle area of the tire, resulting in a relatively larger circumferential deformation at the shoulder part of the tire during driving, making the heat generation at the shoulder position higher, and prone to problems such as delamination or cracking between the belt ply and the tread rubber.

[0003] In order to suppress the circumferential deformation of a tire during use, most tires on the market currently have added a wound cap ply, which improves the grounding performance of the tire and enhances the durability, high-speed performance, and service life of the tire.

[0004] Chinese Invention Patent (Publication No.: CN108638756B, Publication Date: February 9, 2024) discloses a heavy-duty radial tire with a folded multi-layer wound structure. The tire includes a tread, a carcass, belt plies, and bead. The belt plies are composed of a 1# belt ply, a 2# belt ply, a 0-degree belt ply, and a 3# belt ply. The 1# belt ply is arranged on the innermost side in the radial direction and is attached to the carcass. The 2# belt ply is arranged above the 1# belt ply and has the opposite direction to the 1# belt ply. The 0-degree belt ply is arranged on the 2# belt ply. The entire 0-degree belt ply is wound in multiple layers after folding on one shoulder side with a single cord fabric strip and then wound in one or multiple layers to the other shoulder for folding and multi-layer winding. On the outermost side in the radial direction, above the 0-degree belt ply, the 3# belt ply is attached, with the direction opposite to that of the 2# belt ply.

[0005] Chinese Invention Patent (Publication No.: CN114474809A, Publication Date: May 13, 2022) discloses a method for winding a cap strip and a run-flat tire. After the winding of the cap strip is completed, three layers of first shoulders, three layers of second shoulders, and two layers of crowns are formed, which can improve the shoulder rigidity while ensuring the overall rigidity of the tire crown. Among them, both the first shoulder and the second shoulder are three-layer structures, and the crown is a two-layer structure.

[0006] It can be seen that traditional tire cap ply designs mostly adopt a tightly wound method. Although this method ensures the performance of the tire to a certain extent, there are still some deficiencies 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 ply and the tread are uneven, which easily leads to uneven tire wear and affects the service life. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the utility model provides a winter tire with a discontinuous winding crown belt layer. The design of the winding crown belt layer realizes segmented control of the crown belt tension, avoids 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. This design also reduces the weight of the winter tire and the cost of the winding crown belt layer.

[0008] In order to achieve the above object, the utility model adopts the following technical solutions:

[0009] A winter tire with a discontinuous winding crown belt layer, the tire includes a tread, a winding crown belt layer, a belt layer, a carcass, a sidewall and a bead. The belt layer is attached to the carcass, and the winding crown belt layer is arranged on the belt layer. The crown belt tension of the winding crown belt layer adopts a segmented control design. The winding crown belt layer uses a single nylon strip to start spiral winding from the outer edge of the first shoulder to the junction of the first shoulder and the crown, and after winding one more circle, starts intermittent spiral winding to the junction of the second shoulder and the crown, and then continues spiral winding to the outer edge of the second shoulder. The interval between each circle of the crown belt in the intermittent spiral winding of the crown part is 1-3 mm.

[0010] Simply put, the pitch of the winding crown belt layer of the first shoulder and the second shoulder is the same, while the pitch of the winding crown belt layer of the crown part is 1-3 mm larger than the pitch of the winding crown belt layer of the shoulder.

[0011] Preferably, the winding crown belt layer of the crown part adopts intermittent spiral winding, and the interval between each circle of the winding crown belt is 2 mm.

[0012] Preferably, the nylon is 9-11 mm wide and 0.6-1.0 mm thick.

[0013] Preferably, the nylon is 10 mm wide and 0.8 mm thick.

[0014] Preferably, the crown belt tension in the crown area is the tension carried by the tire building machine, and the crown belt tension in the first shoulder and second shoulder areas is twice the tension carried by the tire building machine. The tension carried by the tire building machine can be 20±5 N.

[0015] Preferably, the belt layer includes a 1# belt layer and a 2# belt layer. The 1# belt layer is attached to the carcass and is the innermost radially. The 2# belt layer is attached to the 1# belt layer, and the width of the 2# belt layer is smaller than the width of the 1# belt layer.

[0016] The winding crown belt layer design provided by the present utility model realizes segmented control of the crown belt tension, thereby making the shear and heat distribution between the crown belt and the tread more uniform, avoiding uneven wear of winter tires during high-speed driving or on complex road conditions. At the same time, it increases the shoulder tightening force and improves the high-speed durability performance; when the winter tire bears a load, it can better disperse the pressure, improving the load-bearing capacity and safety of the winter tire; it reduces the tread rigidity, thereby improving the snow traction performance and handling performance of the winter tire on snow while maintaining comparable ice performance; it significantly improves the stability and durability of the crown belt, reducing damage caused by improper winding, applicable to various road application scenarios, improving the service life of the winter tire, and overall improving the comfort of the winter tire; this design reduces the weight of the winter tire and at the same time reduces the cost compared to a fully wound or design with an additional belt layer. Brief Description of the Drawings

[0017] Figure 1 It is a schematic cross-sectional structure diagram of a winter tire for Example 1.

[0018] Figure 2 It is a schematic cross-sectional structure diagram of a winter tire for Comparative Example 1.

[0019] Figure 3 It is a schematic diagram of the winding method for Example 1.

[0020] Figure 4 It is a schematic diagram of the winding method for Comparative Example 1.

[0021] Reference Signs: 1 - 1# belt layer, 2 - 2# belt layer, 3 - winding crown belt layer, 4 - first shoulder, 5 - second shoulder, 6 - tread crown. Detailed Embodiments

[0022] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present application.

[0024] Example 1

[0025] As Figure 1As shown in the figure, a winter tire with a discontinuous winding crown belt layer, the tire includes a tread, a winding crown belt layer 3, a belt layer, a carcass, a sidewall and a 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 the innermost radially. 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.

[0026] The winding crown belt layer 3 is arranged on the belt layer. The crown belt tension of the winding crown belt layer 3 adopts a segmented control design. The winding crown belt layer 3 uses a single nylon strip with a width of 10 mm and a thickness of 0.8 mm to be helically wound from the first shoulder 4 of the tire to the second shoulder 5. Among them, the winding crown belt layer 3 in the crown part 6 adopts an intermittent helical winding, and the interval between each winding crown belt is 2 mm. At the same time, the crown belt tension used is the crown belt tension of the tire building machine. In the shoulder area of the winter tire, 30 mm adopts the conventional non-intermittent helical winding method, and the crown belt tension used is 2 times the crown belt tension of the tire building machine. Specifically, as Figure 1 , 3 shown, the nylon starts from the outer edge of the first shoulder 4 and is helically wound without interval to the junction of the first shoulder 4 and the crown 6. The crown belt winding pitch of the first shoulder 4 is 11 mm; then it is wound one more circle to first cover the crown 6. Taking the end close to the center of the crown 6 as the a end, it is intermittently helically wound from the a end to the junction of the second shoulder 5 and the crown 6, and the interval between each winding crown belt is 2 mm, that is, the crown belt winding pitch of the crown 6 is 13 mm; then it continues to be helically wound without interval to the outer edge of the second shoulder 5, and the crown belt winding pitch of the second shoulder 5 is 11 mm.

[0027] The above crown belt winding pitch can also be other values, such as 12, 13, etc. The winding crown belt layer pitches of the first shoulder 4 and the second shoulder 5 are always the same, while the winding crown belt layer pitch of the crown part 6 is 1 - 3 mm larger than the winding crown belt layer pitch of the shoulder.

[0028] Comparative Example 1

[0029] The difference between the winter tire of Comparative Example 1 and that of Example 1 is that, as Figure 2 shown, the winding crown belt layer 3 in the belt layer part adopts the conventional non-intermittent helical winding method.

[0030] The winter tires of Example 1 and Comparative Example 1 were subjected to performance tests under the same conditions, and the test results are shown in Tables 1 and 2.

[0031] Table 1 Indoor Performance Comparison

[0032] Indoor performance Comparative example 1 Example 1 High speed 100 100 Durability 100 101 Low air pressure durability 100 100 Rolling resistance 100 102 Radial stiffness 100 98 Lateral stiffness 100 100 Longitudinal stiffness 100 97 Torsional stiffness 100 104

[0033] Table 2 Outdoor Performance Comparison

[0034] Outdoor performance Comparative example 1 Example 1 Snow handling 100 102 Snow braking 100 103 Ice handling 100 100 Ice braking 100 99

[0035] As can be seen from Table 1 and Table 2, by adopting the intermittent winding crown belt layer design, Example 1 has better durability, rolling resistance performance, and rigidity, thus having better grip performance. At the same time, Example 1 also has better snow handling performance, and its overall performance is slightly better than that of Comparative Example 1. After measurement, the winter tire of Example 1 is 80 g lighter than the winter tire of Comparative Example 1.

[0036] The above is the description of the embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. 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 herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A winter tire with a discontinuous wound cap ply, the winter tire comprising a tread, a wound cap ply (3), a belt ply, a carcass, a sidewall, and a bead, the belt ply being applied over the carcass, the wound cap ply (3) being disposed on the belt ply, characterized in that, The wound cap ply (3) is formed by helically winding a single nylon strip starting from the outer edge of the first shoulder (4) to the junction of the first shoulder (4) and the crown (6), then winding one more turn and starting intermittent helical winding to the junction of the second shoulder (5) and the crown (6), and then continuing helical winding to the outer edge of the second shoulder (5). The interval between each turn of the intermittent helical winding in the crown (6) part is 1-3 mm.

2. The winter tire with a discontinuous winding crown belt layer according to claim 1, characterized in that, The wound cap ply (3) in the crown (6) part is wound in an intermittent helical manner, and the interval between each turn of the wound cap plies is 2 mm.

3. The winter tire with a discontinuous winding crown belt 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. The winter tire with a discontinuous winding crown ply according to claim 3, characterized in that, The nylon has a width of 10 mm and a thickness of 0.8 mm.

5. A winter tire having a discontinuous winding crown belt layer according to claim 1, characterized in that, The cap ply tension in the crown (6) area is the tension provided by the tire building machine, and the cap ply tension in the first shoulder (4) and second shoulder (5) areas is twice the tension provided by the tire building machine.

6. The winter tire with a discontinuous winding crown belt layer according to claim 1, characterized in that, 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 the innermost radially. The 2# belt layer (2) is disposed on top of 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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