A tire with a reinforced shoulder structure

Abstract

This utility model discloses a tire with a reinforced shoulder structure, belonging to the field of tire manufacturing technology. It includes a ply, a belt layer, a ply rubber strip, a crown belt layer, and a reverse wrap portion. The ply layer's end wraps back to the shoulder area, forming a reverse wrap portion. The belt layer is located in the crown area above the ply layer. The crown belt layer covers the upper surface of the belt layer. The ply rubber strip is attached to the end of the ply layer, extending circumferentially along the tire, and its end is attached to the bottom surface of the belt layer and crown belt layer ends. The ply rubber strip fills the reverse wrap edge of the ply layer and the shoulder space at the end of the belt layer. This invention solves the problem of structural integrity damage caused by excessive stretching of the ply layer due to high-pressure environments in existing technologies. It significantly reduces raw material consumption while maintaining the uniformity of the tire carcass cord arrangement and avoiding the distortion risk caused by high-pressure vulcanization.

Description

Technical Field

[0001] This utility model relates to the field of tire manufacturing technology, specifically to a tire with a reinforced shoulder structure. Background Technology

[0002] The shoulder cutout phenomenon in tire blanks stems from inherent defects in the interfaces of multilayer composite materials. When the ply layer wraps back to the sidewall area, a significant stepped height difference is formed between its end edge and the end of the belt layer. This space persists during the molding process due to differences in material shrinkage. The high-temperature environment during vulcanization causes the trapped air to expand violently, and the gas pressure breaks through the weak bonding surface between the ply and belt layers, forming irreversible shoulder bubbles. These bubbles become pressure concentration sources when the finished tire is subjected to dynamic loads, causing minor issues like driving vibration and noise, and severe issues like tire delamination or even blowouts.

[0003] Current industry solutions rely on increasing vulcanization pressure to compress shoulder gaps through external pressure. However, this approach leads to problems such as: the high-pressure environment forces excessive stretching of the ply layers, damaging structural integrity and directly weakening the tire's fatigue resistance; increased pressure increases costs and equipment load, causing the vulcanization process to deviate from its optimal energy efficiency range; and the gas is not eliminated under high pressure but is driven to the crown layer or tread area, forming hidden internal air bubbles. This method cannot truly and effectively solve the problem.

[0004] Therefore, how to provide a tire with a reinforced shoulder structure to solve the problem of structural integrity damage caused by existing structures that increase vulcanization and shaping pressure is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] Therefore, this utility model provides a tire with a reinforced shoulder structure to solve the problem of structural integrity damage caused by excessive stretching of the ply layer due to high pressure environment in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a tire with a reinforced shoulder structure, comprising:

[0008] The ply fabric has an inverted section at the end that wraps back to the tire shoulder area.

[0009] A belt layer is disposed in the tire crown area above the ply layer;

[0010] A crown layer covers the upper surface of the belt layer;

[0011] A cord strip is attached to the end of the cord layer, the cord strip extends circumferentially along the tire and its end is attached to the bottom surface of the end of the belt layer and the crown layer;

[0012] The fabric adhesive strip fills the shoulder space at the reverse edge of the fabric layer and the end of the belt layer.

[0013] In one possible implementation, the cross-sectional shape of the fabric adhesive strip is strip-shaped.

[0014] In one possible implementation, the cross-section of the strip-shaped fabric adhesive strip is trapezoidal.

[0015] In one possible implementation, a support member is provided inside the anti-wrapping section.

[0016] In one possible implementation, the support member is a steel wire ring.

[0017] In one possible implementation, the thickness of the fabric adhesive strip is M millimeters, where 1 millimeter ≤ M ≤ 2 millimeters.

[0018] This invention has the following advantages: By precisely filling the gap between the end of the ply layer and the end of the belt layer with the ply rubber strip, an impenetrable physical seal is formed, solving the defects of shoulder cut-out and vulcanization bubbles in the tire blank. Its design achieves maximum sealing performance with minimal material intervention. It only requires adding a ply rubber strip at the end of the ply to replace the traditional overall ply thickening solution, significantly reducing raw material consumption. At the same time, it completely preserves the uniformity of the tire carcass cord arrangement and avoids the distortion risk caused by high-pressure vulcanization. Furthermore, by bonding the end of the ply rubber strip with the belt layer and crown layer, it is perfectly compatible with the existing reverse wrapping pressure roller process. It can efficiently discharge gas without adjusting the shaping pressure, and simultaneously avoids the chain of negative effects caused by traditional solutions: ply structure damage, increased energy consumption, and bubble space transfer. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] Figure 1A cross-sectional view of a tire with a reinforced shoulder structure provided by this utility model;

[0022] Figure 2 A schematic diagram of a tire with a reinforced shoulder structure provided by this utility model;

[0023] Figure 3 Provided by this utility model Figure 2 Enlarged view of a portion of point A in the middle;

[0024] Figure 4 A cross-sectional view of the fabric adhesive strip provided by this utility model;

[0025] In the diagram: 1. Curtain layer; 2. Belt layer; 3. Curtain adhesive strip; 4. Crown layer; 5. Reverse wrapping part; 51. Support member; 511. Steel wire ring. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Please refer to Figures 1-4 The present invention discloses a tire with a reinforced shoulder structure, as follows: Figure 1 It includes a ply 1, a belt layer 2, a ply strip 3, a crown belt layer 4, and a reverse wrap portion 5. The end of the ply 1 is reverse wrapped to the shoulder area to form the reverse wrap portion 5. The belt layer 2 is disposed in the crown area above the ply 1. The crown belt layer 4 covers the upper surface of the belt layer 2. The ply strip 3 is attached to the end of the ply 1. The ply strip 3 extends along the tire circumference and its end is attached to the bottom surface of the end of the belt layer 2 and the crown belt layer 4. The ply strip 3 fills the reverse wrap edge of the ply 1 and the shoulder space at the end of the belt layer 2.

[0028] The usage process of this utility model embodiment is as follows:

[0029] The ply cord strip 3 is circumferentially bonded, and its cross-sectional design enhances its wedging ability into shoulder gaps. The ply layer is reverse-wrapped to the tire sidewall using a forming device to form a reverse-wrapped section 5. Simultaneously, the ply cord strip 3 is precisely extended to the bottom surface of the belt layer 2 and crown layer 4, establishing a sealing system and filling the gap between the reverse-wrapped edge and the belt layer 2, thus blocking gas leakage channels circumferentially. Subsequently, the reverse-wrapping pressure roller applies directional compression to the shoulder, and the ply cord strip 3 completely fills the gaps under mechanical pressure, while forcing trapped air to escape. A pre-placed steel wire ring 511 within the reverse-wrapped section 5 provides rigid support to resist compression deformation. After vulcanization and shaping, the ply cord strip 3 forms a filler, eliminating the potential for shoulder cut-outs in the tire blank and allowing the finished tire to avoid adverse conditions caused by shoulder air bubbles during driving. This solution replaces traditional pressurization with physical filling, simultaneously reducing the cut-off rate. Furthermore, because the fabric rubber strip 3 buffers the pressure between the fabric layer 1 and the belt layer 2, it significantly reduces fabric wear, achieving a simultaneous improvement in safety and service life.

[0030] In a specific embodiment, such as Figure 3 The cross-sectional shape of the tire cord strip 3 is strip-shaped. This strip-shaped cross-section design is an innovative structural feature for achieving shoulder sealing. This shape extends continuously along the tire circumference, precisely matching the irregular curved surface space of the shoulder and completely eliminating filling dead angles. During the extrusion process of the reverse-wrapping pressure roller, the strip structure exhibits unique characteristics: its thickness direction compresses and fills vertical gaps, while its length direction extends to cover the bottom interface between the belt layer 2 and the crown belt layer 4, forming a gapless seal and thus solving the problem of shoulder voids during vulcanization.

[0031] In a specific embodiment, such as Figure 4 The strip-shaped fabric rubber strip 3 has a trapezoidal cross-section. When the cross-section is defined as trapezoidal, the geometry, which is narrower at the top and wider at the bottom, generates a gain. The inclined surface creates a wedge-like effect, guiding the fabric rubber strip 3 into the wedge-shaped gap between the back edge of the fabric and the belt layer. The wider bottom surface increases the contact area, improving peel resistance and resisting the forces during vulcanization. Compared to the defects of traditional sheet-shaped rubber materials, which are prone to wrinkling and forming new air pockets, the strip-shaped fabric rubber strip 3 directionally discharges gas during extrusion, eliminating shoulder cutouts from the structural root and perfectly replacing the outdated process that relies on high-pressure setting.

[0032] In a specific embodiment, such as Figure 1 A support member 51 is provided inside the reverse wrapping part 5. The support member 51 provided inside the reverse wrapping part 5 is preferably a steel wire ring 511, which is the core for maintaining the stability of the shoulder sealing structure. First, it provides a rigid skeleton during the reverse wrapping process of the curtain fabric, fixes the curvature shape of the reverse wrapping part 5, and prevents the curtain fabric rubber strip 3 from detaching from the belt layer 2 due to the collapse of the curtain fabric. Second, it absorbs the molding pressure and reduces the repeated bending damage of the reverse wrapping part 5 of the curtain fabric layer 1, thus consolidating the anti-splitting sealing system from the structural root.

[0033] In a specific embodiment, such as Figure 1 The support member 51 is a steel wire ring 511. This steel wire ring 511 helps to solve the problem of cut-out through rigidity, provides a metal skeleton when the cord is reversed, locks the reverse curvature, prevents the cord rubber strip 3 from separating from the belt layer 2, absorbs pressure simultaneously, reduces bending fatigue of the reversed part 5 of the cord layer 1, and replaces the traditional flexible support with mechanical rigidity, achieving a dual breakthrough in sealing reliability and tire life.

[0034] In a specific embodiment, the thickness of the fabric adhesive strip 3 is M millimeters, where 1 mm ≤ M ≤ 2 mm. Limiting the thickness of the fabric adhesive strip 3 to 1 mm ≤ M ≤ 2 mm achieves the goal of preventing voids: its thickness ≥ 1 mm ensures sufficient filling of the shoulder gap, and its thickness ≤ 2 mm ensures smooth gas escape during the compression of the back-wrapping pressure roller. Simultaneously, this parameter balances the rigidity of the fabric adhesive strip 3, achieving both the sealing requirement of ensuring the fabric adhesive strip 3 adheres tightly to the belt layer 2 and contributing the core benefit of reducing fabric consumption through pressure buffering, ultimately eliminating the shoulder void problem.

[0035] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A tire having a reinforced shoulder structure, characterized in that, The present application provides a tire, comprising: a ply (1) having a turned-up portion (5) formed by turning up the end of the ply (1) to a shoulder region; a belt layer (2) disposed in a crown region above the ply (1); a crown layer (4) covering the upper surface of the belt layer (2); a strip of rubber (3) attached to the end of the ply (1), the strip of rubber (3) extending in the tire circumferential direction and having an end attached to the bottom surface of the end of the belt layer (2) and the crown layer (4); the strip of rubber (3) filling the shoulder space between the turned-up edge of the ply (1) and the end of the belt layer (2).

2. A tyre reinforced at the shoulders according to claim 1, characterised in that, The cross-sectional shape of the strip of rubber (3) is strip-shaped.

3. A tyre reinforced at the shoulders according to claim 2, characterised in that, The cross-sectional shape of the strip-shaped strip of rubber (3) is trapezoidal.

4. The tire of claim 1 wherein, The turned-up portion (5) is provided with a support member (51).

5. Tyre reinforced at the shoulders according to Claim 4, characterized in that, The support member (51) is a bead wire (511).

6. The tire of claim 1 wherein, The thickness of the strip of rubber (3) is M mm, 1 mm≤M≤2 mm.

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