Pneumatic tire

Abstract

The invention discloses a pneumatic tire, and relates to the technical field of tires, the pneumatic tire comprises a tire body, a mute layer and a bonding layer; the mute layer is arranged on the inner circumferential surface of the tire body; the bonding layer is used for bonding the mute layer to the inner circumferential surface of the tire body, the bonding layer comprises at least one reference adhesive tape and a stress dispersion adhesive tape, the coating path of the reference adhesive tape extends in the circumferential direction of the tire body, and the coating path of the stress dispersion adhesive tape is distributed on the inner circumferential surface of the tire body in the form of at least one of a curve and a broken line; and bonding force capable of being bonded with the mute layer is formed in the circumferential direction and the axial direction of the tire body. By arranging at least one reference adhesive tape and one stress dispersion adhesive tape in the shape of a curve, a broken line or a combination thereof, a rigid-flexible composite bonding structure can be formed, so that stress concentration at local positions is avoided, the phenomena of fatigue and edge warping of the bonding layer are remarkably reduced, the falling risk of the mute layer is reduced, and the service life of the mute layer is prolonged. And the adhesion stability and durability of the mute layer are improved.

Description

Technical Field

[0001] This application relates to the field of tire technology, and more specifically, to a pneumatic tire. Background Technology

[0002] When a pneumatic tire is in motion, the air column inside the tire vibrates, creating cavity resonance noise that affects ride comfort. To suppress this noise, a layer of porous foam material, known as sound-absorbing cotton, is usually attached to the inner circumference of the tire.

[0003] Traditional noise-reducing foam is bonded to the tire by applying a continuous linear or circumferential adhesive to the inner circumference of the tire. However, under high-speed rotation and complex road conditions, tires are subjected to enormous centrifugal forces, shear forces, and repeated bending deformations, which easily leads to stress concentration at the bonding interface, especially in areas of dynamic tire deformation. This stress concentration accelerates fatigue failure at the bonding interface, ultimately causing the noise-reducing foam to peel up at the edges, partially detach, or even completely fall off. This not only causes the tire to lose its original noise-reducing function, but the detached noise-reducing foam may also affect the tire's dynamic balance, creating safety hazards.

[0004] Therefore, how to reduce the risk of sound-absorbing cotton falling off has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide an inflatable tire to reduce the risk of sound-absorbing cotton falling off.

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

[0007] An inflatable tire, comprising:

[0008] Tire body;

[0009] A sound-absorbing layer is disposed on the inner circumferential surface of the tire body;

[0010] An adhesive layer is provided for bonding the sound-absorbing layer to the inner circumferential surface of the tire body. The adhesive layer includes at least one reference strip and a stress-dispersing strip. The coating path of the reference strip extends circumferentially along the tire body, and the coating path of the stress-dispersing strip is distributed on the inner circumferential surface of the tire body in at least one of a curve and a broken line, so as to form an adhesive force capable of bonding the sound-absorbing layer in both the circumferential and axial directions of the tire body.

[0011] Optionally, in the above-mentioned pneumatic tire, there are two reference rubber strips, and the two reference rubber strips are respectively disposed near the two side edges of the sound-absorbing layer, and the stress-dispersing rubber strip is disposed between the two reference rubber strips.

[0012] Optionally, in the above-mentioned pneumatic tire, the interval between the two reference rubber strips is not less than 1 mm and not greater than 95% of the total tread width of the tire body.

[0013] Optionally, in the above-mentioned pneumatic tire, the reference rubber strip is one piece, and the reference rubber strip is located at the center line position in the width direction of the sound-absorbing layer, and stress-dispersing rubber strips are respectively provided on both sides of the reference rubber strip.

[0014] Optionally, in the above-mentioned pneumatic tire, the coating path of the stress-dispersing rubber strip is distributed in a single S-shaped curve; or,

[0015] The coating path of the stress-dispersing adhesive strip is distributed in multiple S-shaped curves, and the distribution form of each S-shaped curve includes at least one of parallel distribution, cross distribution and symmetrical distribution.

[0016] Optionally, in the above-mentioned pneumatic tire, the coating path of the stress-dispersing rubber strip includes at least one peak and a trough, and the distance between the peak and the trough is not less than 5 mm and not greater than 1 / 2 of the inner circumference of the tire body.

[0017] Optionally, in the above-mentioned pneumatic tire, the coating path of the stress-dispersing rubber strip is distributed in a cross-line pattern.

[0018] Optionally, in the above-mentioned pneumatic tire, the coating path of the stress-dispersing rubber strip is distributed in a mesh structure formed by multiple intersecting lines.

[0019] Optionally, in the above-mentioned pneumatic tire, the coating path of the stress-dispersing rubber strip is distributed as a single oblique line or multiple parallel oblique lines.

[0020] Optionally, in the above-mentioned pneumatic tire, the sound-absorbing layer and the adhesive layer are cured by hot pressing or local pressure.

[0021] Optionally, in the above-mentioned pneumatic tire, the sound-absorbing layer is a sound-absorbing cotton made of porous foam material.

[0022] The pneumatic tire provided in this application bonds a sound-absorbing layer to the inner circumferential surface of the tire body through an adhesive layer composed of at least one reference rubber strip and a stress-dispersing rubber strip. Simultaneously, the coating path of the reference rubber strip can extend circumferentially along the tire body, and the coating path of the stress-dispersing rubber strip can be distributed on the inner circumferential surface of the tire body in at least one of the forms of curves and broken lines, thereby forming an adhesive force capable of bonding the sound-absorbing layer in both the circumferential and axial directions of the tire body. As can be seen from the above example, the pneumatic tire provided in this application, by providing at least one reference rubber strip and a stress-dispersing rubber strip that is curved, broken, or a combination thereof, can form a composite adhesive structure that combines rigidity and flexibility. Among them, the reference rubber strip provides a stable reference positioning for the noise reduction layer, preventing it from slipping or misaligning during tire rotation; while the non-linear stress dispersion rubber strip can effectively transmit and disperse the shear stress generated during the dynamic deformation of the tire along its complex path, avoiding stress concentration in local locations, significantly reducing adhesive layer fatigue and edge lifting, reducing the risk of noise reduction layer detachment, and improving the stability and durability of the noise reduction layer adhesion, thereby ensuring the long-lasting reliability of the tire noise reduction function and extending the overall service life of the pneumatic tire.

[0023] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are those explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application 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 embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a cross-sectional schematic diagram of the pneumatic tire provided in Embodiment 1 of this application;

[0026] Figure 2 This is a cross-sectional schematic diagram of the pneumatic tire provided in Embodiment 2 of this application;

[0027] Figure 3 This is a cross-sectional schematic diagram of the pneumatic tire provided in Embodiment 3 of this application;

[0028] Figure 4 This is a cross-sectional schematic diagram of the pneumatic tire provided in Embodiment 4 of this application;

[0029] Figure 5 This is a cross-sectional schematic diagram of the pneumatic tire provided in Embodiment 5 of this application;

[0030] Figure 6 This is a cross-sectional schematic diagram of the pneumatic tire provided in Embodiment Six of this application;

[0031] Among them, 10 is the tire body, 20 is the adhesive layer, 21 is the base rubber strip, and 22 is the stress-dispersing rubber strip. Detailed Implementation

[0032] The core of this application is to provide an inflatable tire to reduce the risk of sound-absorbing cotton falling off.

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] When a pneumatic tire is in motion, the unevenness of the road surface causes air vibrations inside the tire, creating cavity resonance and generating noise in the 200Hz-250Hz frequency range. To reduce this cavity resonance, sound-absorbing cotton can be attached to the inside of the tire.

[0035] Traditional sound-absorbing cotton is typically applied in a linear or continuous ring pattern, which causes the adhesive to be stressed in the dynamic deformation area, leading to fatigue at the adhesive interface. When the internal air pressure and temperature of the tire change, the linear application area of ​​the sound-absorbing cotton is insufficient to disperse the stress, resulting in localized peeling.

[0036] Therefore, such as Figure 1 As shown in the illustration, this application discloses a pneumatic tire, including a tire body 10, a noise-reducing layer, and an adhesive layer 20. By providing at least one reference rubber strip 21 and a stress-dispersing rubber strip 22 that is curved, zigzag, or a combination thereof, a composite adhesive structure combining rigidity and flexibility can be formed. The reference rubber strip 21 provides a stable reference positioning for the noise-reducing layer, preventing it from slipping or misaligning during tire rotation. The non-linear stress-dispersing rubber strip 22 effectively transmits and disperses the shear stress generated during dynamic tire deformation along its complex path, avoiding stress concentration at localized locations. This significantly reduces fatigue and warping of the adhesive layer 20, decreases the risk of the noise-reducing layer detaching, and improves the stability and durability of the noise-reducing layer's adhesion, thereby ensuring the tire's long-lasting and reliable noise reduction function and extending the overall service life of the pneumatic tire.

[0037] The following will combine Figures 1 to 6 The pneumatic tires disclosed in the embodiments of this application will be explained and described in detail.

[0038] like Figures 1 to 6 As shown, the tire body 10, as the core load-bearing structure of the tire, provides a base surface for the installation of the sound-absorbing layer on its inner circumferential surface, allowing the sound-absorbing layer to be installed on the inner circumferential surface of the tire body 10. The sound-absorbing layer can be made of porous foam material. The porous structure of the sound-absorbing foam material effectively absorbs sound wave energy. This porous foam material is typically formed by polymer foaming, containing numerous interconnected or independent micropores. These pores can capture sound waves and attenuate sound energy through friction and heat conversion. Specifically, the sound-absorbing material can be open-cell polyurethane foam, which has excellent sound absorption performance and good compression resilience. Alternatively, closed-cell polyethylene foam can be used, which provides a certain degree of sound absorption while also offering good heat insulation and moisture-proof properties. It should be noted that the sound-absorbing layer can also use fiber felt with sound-absorbing function to absorb internal tire noise, thereby improving the driving experience.

[0039] In order to reliably fix the sound-absorbing layer to the inner circumferential surface of the tire body 10, such as Figures 1 to 6 As shown, an adhesive layer 20 can be applied to the inner circumferential surface of the tire body 10 to bond the sound-dampening layer to the inner circumferential surface of the tire body 10. The adhesive layer 20 can be made of conventional rubber-based adhesives, silicone adhesives, polyurethane adhesives, or epoxy resin adhesives to provide high bonding strength. The adhesive layer 20 may include at least one reference strip 21 and a stress-dispersing strip 22. The application path of the reference strip 21 can extend circumferentially along the tire body 10, and the reference strip 21 can be a continuous annular strip or multiple spaced annular strips, for example, as shown in the diagram. Figure 6 As shown, a ring-shaped reference adhesive strip 21 can be applied to the center of the sound-absorbing layer, or as shown in the diagram. Figures 1 to 5 As shown, an annular reference strip 21 is applied to each of the two edges of the sound-absorbing layer. This reference strip 21 provides an initial fixing force along the tire circumference, thus providing a stable reference positioning for the sound-absorbing layer and preventing slippage or misalignment during tire rotation. The application path of the stress-dispersing strip 22 can be distributed on the inner circumferential surface of the tire body 10 in at least one of the following patterns: curve and polygonal line. Figure 1 and Figure 6 As shown, the coating path of the stress-dispersing adhesive strip 22 can adopt one or more wavy curves, such as... Figures 2 to 5As shown, a zigzag line or a complex path composed of straight and curved segments can also be used to form an adhesive force capable of bonding the noise reduction layer in both the circumferential and axial directions of the tire body 10. This allows the stress-dispersing rubber strip 22 to disperse the stress acting on the bonding interface over a wider area, avoiding stress concentration, significantly reducing fatigue and warping of the bonding layer 20, reducing the risk of the noise reduction layer falling off, and improving the stability and durability of the noise reduction layer adhesion. This ensures the long-lasting reliability of the tire's noise reduction function and extends the overall service life of the pneumatic tire.

[0040] In the above embodiment, through the synergistic effect of the reference rubber strip 21 and the stress-dispersing rubber strip 22, adhesive force capable of bonding the sound-absorbing layer can be formed in both the circumferential and axial directions of the tire body 10. The reference rubber strip 21 provides circumferential adhesive support, while the stress-dispersing rubber strip 22, through its special geometric shape, jointly bears and disperses stress in both the circumferential and axial directions. Specifically, when an inflatable tire is traveling at high speed, centrifugal force mainly acts in the circumferential direction, while deformation caused by uneven road surfaces generates stress in both the circumferential and axial directions. Through the synergistic effect of the reference rubber strip 21 and the stress-dispersing rubber strip 22, the adhesive force is no longer limited to a single direction but can effectively resist complex stresses from various directions, thereby significantly improving the bonding reliability of the sound-absorbing layer under dynamic operating conditions.

[0041] The pneumatic tire disclosed in this application uses an adhesive layer 20 composed of at least one reference rubber strip 21 and a stress-dispersing rubber strip 22 to bond a sound-absorbing layer to the inner circumferential surface of the tire body 10. Simultaneously, the coating path of the reference rubber strip 21 can extend circumferentially along the tire body 10, and the coating path of the stress-dispersing rubber strip 22 can be distributed on the inner circumferential surface of the tire body 10 in at least one of curved or broken lines, thereby forming an adhesive force capable of bonding the sound-absorbing layer in both the circumferential and axial directions of the tire body 10.

[0042] The pneumatic tire disclosed in this application can form a composite adhesive structure that combines rigidity and flexibility by setting at least one reference rubber strip 21 and a stress-dispersing rubber strip 22 that is curved, zigzag, or a combination thereof. The reference rubber strip 21 provides a stable reference positioning for the noise-reducing layer, preventing it from slipping or misaligning during tire rotation. The non-linear stress-dispersing rubber strip 22 effectively transmits and disperses the shear stress generated during dynamic tire deformation along its complex path, avoiding stress concentration in localized areas. This significantly reduces fatigue and warping of the adhesive layer 20, decreases the risk of noise-reducing layer detachment, and improves the stability and durability of the noise-reducing layer adhesion, thereby ensuring the long-lasting reliability of the tire's noise reduction function and extending the overall service life of the pneumatic tire.

[0043] In some embodiments, such as Figures 1 to 5As shown, two reference rubber strips 21 can be arranged in parallel, with each reference rubber strip 21 positioned near the edges of the sound-absorbing layer. A stress-dispersing rubber strip 22 can be positioned between the two reference rubber strips 21. Specifically, by setting two reference rubber strips 21, the positioning accuracy and stability of the sound-absorbing layer in the width direction can be enhanced, ensuring more accurate alignment during installation and resisting radial and axial shear forces during tire operation. The reference rubber strips 21 can be formed by simultaneously or sequentially applying two parallel reference rubber strips 21 onto the inner circumferential surface of the tire body 10 using two independent applicator heads or nozzles, or by using a single applicator with dual outlets to form two reference rubber strips 21 at once. Simultaneously, the two reference rubber strips 21 are positioned near the edges of the sound-absorbing layer, allowing them to directly act on the edge area of ​​the sound-absorbing layer, preventing warping, detachment, or displacement. Furthermore, by providing strong circumferential support at the edges, the sound-absorbing layer can be effectively fixed, preventing uneven stress concentration or peeling at its edges under stress. During coating, the spacing between the two reference adhesive strips 21 can be preset according to the width of the sound-absorbing layer, maintaining a certain distance from the edge of the sound-absorbing layer to ensure effective adhesion. Alternatively, a visual recognition system or mechanical limiting device can be used to guide the coating equipment to accurately apply the reference adhesive strips 21 near the two edges of the predetermined installation position of the sound-absorbing layer. The stress-dispersing adhesive strip 22 is arranged between the two reference adhesive strips 21, making full use of the main area of ​​the sound-absorbing layer for adhesion, forming a more uniform and comprehensive bonding surface. The reference adhesive strips 21 provide the main circumferential positioning and support, while the stress-dispersing adhesive strip 22 provides additional axial and circumferential adhesive force in the middle area, effectively absorbing and dispersing various stresses generated by the tire during dynamic operation, avoiding stress concentration that could lead to adhesion failure. After applying the two reference adhesive strips 21, the coating equipment can switch to the stress-dispersing adhesive strip 22 coating mode, applying the adhesive within the area defined by the two reference adhesive strips 21 according to a preset curve or zigzag path. It should be noted that the stress-dispersing adhesive strip 22 can be applied using a multi-axis robot or a CNC glue applicator, thereby precisely controlling the glue application path to ensure that the stress-dispersing adhesive strip 22 is evenly filled in the area between the two reference adhesive strips 21.

[0044] In some embodiments, such as Figure 1As shown, the interval L1 between the two reference rubber strips 21 can be no less than 1 mm and no more than 95% of the total tread width of the tire body 10. The interval of no less than 1 mm between the two reference rubber strips 21 ensures that the stress-dispersing rubber strip 22 has sufficient space between the two reference rubber strips 21 for a curved or zigzag distribution, allowing it to fully exert its stress-dispersing effect in the circumferential and axial directions. It also facilitates the flow and curing of the adhesive during bonding, preventing defects caused by adhesive accumulation. Furthermore, the interval of no more than 95% of the total tread width of the tire body 10 ensures that the reference rubber strips 21 are not too close to the tread edge of the tire body 10, thus providing sufficient space for effective bonding of the noise-reducing layer edge. This ensures that the bonding area of ​​the reference rubber strips 21 and the stress-dispersing rubber strip 22 is mainly concentrated in the tread area, matching the area typically covered by the noise-reducing layer and avoiding unnecessary rubber strip waste or bonding in non-critical areas.

[0045] In the above embodiment, the adhesive layer 20 firmly bonds the sound-absorbing layer to the inner circumferential surface of the tire body 10 through two reference rubber strips 21 extending circumferentially along the tire body 10 and a stress-dispersing rubber strip 22 disposed therebetween. Simultaneously, when the interval is not less than 1 mm, it ensures that the stress-dispersing rubber strip 22 has sufficient space between the two reference rubber strips 21 to be distributed in a curved or zigzag pattern, thereby enabling it to fully exert its stress-dispersing effect in the circumferential and axial directions of the tire body 10, effectively alleviating local stress concentration caused by uneven force between the sound-absorbing layer and the tire body 10, and preventing adhesive failure. Furthermore, when the interval is no greater than 95% of the total width of the tire body 10 tread, it ensures that the effective bonding area of ​​the adhesive layer 20 is mainly concentrated within the tread area of ​​the tire body 10, so that the edge of the noise reduction layer can be effectively supported by the reference rubber strip 21, preventing the edge of the noise reduction layer from lifting or falling off due to lack of support. This allows the reference rubber strip 21 and the stress-dispersing rubber strip 22 to work together to form a uniform and durable adhesive force, thereby significantly improving the overall bonding reliability and durability of the noise reduction layer.

[0046] In some embodiments, such as Figure 6As shown, a single reference strip 21 can be used, meaning that only one reference strip 21 extends circumferentially along the tire body 10 in the adhesive layer 20. This simplifies the structure of the adhesive layer 20 and reduces the complexity of the coating process. The reference strip 21 can be positioned at the centerline of the sound-dispersing layer in the width direction, i.e., the centerline of the reference strip 21 in the transverse (width) direction of the sound-dispersing layer. This ensures a symmetrical distribution of adhesive force in the width direction of the sound-dispersing layer, providing a balanced starting point for the stress-dispersing strips 22 on both sides and contributing to the stability of the overall adhesive structure. Simultaneously, the presence of stress-dispersing strips 22 on both sides of the reference strip 21 allows the stress-dispersing strips 22 to evenly disperse adhesive stress from the center outwards, covering the entire width of the sound-dispersing layer, thereby forming a more uniform and effective adhesive force in both the circumferential and axial directions. Specifically, the coating head can be precisely aligned with the geometric center line in the width direction of the sound-absorbing layer by setting a laser or vision positioning system on the coating equipment; or manual or mechanical positioning can be assisted by pre-setting marking lines on the inner circumferential surface of the tire body 10 or the sound-absorbing layer. At the same time, stress-dispersing adhesive strips 22 can be applied simultaneously or in stages on both sides of the reference adhesive strip 21 after the reference adhesive strip 21 has been coated by a dual-nozzle or multi-nozzle coating system; alternatively, pre-formed stress-dispersing adhesive strips 22 can be bonded to both sides of the reference adhesive strip 21.

[0047] In the above embodiment, by defining a single reference adhesive strip 21 and positioning it at the centerline of the sound-absorbing layer's width, a core, balanced adhesive support is provided for the sound-absorbing layer. Based on this, stress-dispersing adhesive strips 22 are arranged on both sides of the central reference adhesive strip 21, thereby uniformly extending and dispersing adhesive stress from the center outwards. Furthermore, by using the reference adhesive strip 21 as the main circumferential adhesive framework, while the stress-dispersing adhesive strips 22 on both sides effectively transmit and disperse the adhesive force from the center to the entire width and axial direction of the sound-absorbing layer, the synergistic effect between the reference adhesive strip 21 and the stress-dispersing adhesive strips 22 on both sides ensures that the adhesive layer 20 provides comprehensive and balanced support to the sound-absorbing layer, avoiding localized stress concentration caused by uneven adhesive force distribution, thereby significantly improving the adhesive strength and durability between the sound-absorbing layer and the tire body 10. In addition, the single central reference adhesive strip 21 simplifies the coating process and improves production efficiency.

[0048] In some embodiments, such as Figure 1As shown, the coating path of the stress-dispersing adhesive strip 22 can be distributed as a single S-shaped curve. That is, the stress-dispersing adhesive strip 22 in the adhesive layer 20 exhibits a continuous S-shaped trajectory with reverse bending points on the inner circumferential surface of the tire body 10. This S-shaped curve is not a simple straight line or a single-direction arc, but includes at least one smooth transition from convex to concave or from concave to convex, forming a wavy or serpentine continuous path. This optimizes the stress dispersion capability of the adhesive layer 20, absorbing and buffering various stresses acting on the sound-absorbing layer through the flexible deformation of the curve, and avoiding excessive stress concentration at specific points or areas. It should be noted that the S-shaped curve distribution coating path of the stress-dispersing adhesive strip 22 can be achieved using a high-precision CNC adhesive application system. Through a pre-programmed S-shaped curve mathematical model, such as an algorithm based on Bézier curves or spline curves, the movement trajectory of the adhesive nozzle on the inner circumferential surface of the tire body 10 can be precisely controlled, thereby forming a continuous and smooth S-shaped adhesive strip. Of course, a guide mold or template with an S-groove can also be used to temporarily fix it on the inner circumferential surface of the tire body 10, and then the adhesive can be applied along the S-groove of the mold to ensure that the stress-dispersing adhesive strip 22 can accurately form the required S-curve distribution.

[0049] In some embodiments, the coating path of the stress-dispersing adhesive strip 22 may also be distributed in multiple S-shaped curves, i.e., as shown in the figure. Figure 6 As shown, the coating path of the stress-dispersing adhesive strip 22 can also be distributed as two, three, or more S-shaped curves on both sides of a single reference adhesive strip 21. Alternatively, the coating path of the stress-dispersing adhesive strip 22 can also be distributed as two, three, or more S-shaped curves between two reference adhesive strips 21. The distribution form of each S-shaped curve can include at least one of parallel distribution, intersecting distribution, and symmetrical distribution. That is, each S-shaped curve can have the same bending direction, the same bending radius, and the same bending period, while the spacing between any two adjacent S-shaped curves remains constant, forming a continuous, parallel array of S-shaped curves; each S-shaped curve can also be arranged intersecting each other at a certain angle, with intersection points between adjacent S-shaped curves, thus forming an intersecting S-shaped curve structure; each S-shaped curve can also be arranged symmetrically with its shape, bending direction, spacing, and arrangement based on a certain axis or center point; of course, each S-shaped curve can also... The above distribution methods can be combined in various ways. For example, each S-curve can be set up with a certain center line or center point as a symmetrical reference, and they can be arranged to intersect each other. They are also symmetrical about the reference, that is, the intersection position, intersection angle, curve shape and arrangement spacing of adjacent S-curves are all symmetrical, forming a symmetrical cross structure. The symmetrical cross distribution of S-curves can increase the effective contact area between the sound insulation layer and the tire body 10, making the bonding force more uniform and firm, and less prone to delamination and peeling. At the same time, it can disperse local concentrated stress, reduce stress change when under stress, and greatly improve the anti-peeling, anti-impact and anti-shear performance of the sound insulation layer.

[0050] In the above embodiments, by employing an S-shaped curve distribution of the stress-dispersing adhesive strip 22, adhesive force can be formed in both the circumferential and axial directions of the tire body 10 to cope with the complex stresses generated by the tire during dynamic operation. Simultaneously, the continuous bending characteristics of the S-shaped curve allow the adhesive layer 20 to construct a more flexible and efficient stress transfer network between the sound-absorbing layer and the tire body 10. When the tire body 10 deforms due to force, or when the sound-absorbing layer is subjected to shear, tension, or other forces, the S-shaped curve can effectively disperse and buffer these forces along its smooth bending path, thereby avoiding stress concentration that may occur at straight lines or sharp-angled bends. This results in a more balanced distribution of adhesive force in all directions, more effectively resisting the multi-directional and irregular stresses generated by the tire's dynamic operation, significantly enhancing the adhesion strength and durability between the sound-absorbing layer and the tire body 10, and ensuring that the sound-absorbing layer is not easily detached during long-term use.

[0051] In some embodiments, such as Figure 1 As shown, the coating path of the stress-dispersing adhesive strip 22 may include at least one peak and one trough. That is, the coating path of the stress-dispersing adhesive strip 22 may have one peak and one trough, or two or more peaks and troughs, and the spacing L2 between the peaks and troughs is not less than 5 mm and not greater than 1 / 2 of the inner circumference of the tire body 10. By ensuring that the spacing L2 between the peaks and troughs is not less than 5 mm, it is ensured that the S-shaped curve of the stress-dispersing adhesive strip 22 has sufficient space for expansion, avoiding the curve from being too dense or abrupt. This helps to prevent the adhesive strip from being overly concentrated in local areas, thus avoiding the formation of excessively high local stress points after the adhesive layer 20 has cured, which would affect the bonding strength and durability. In addition, sufficient spacing also provides a certain buffer and deformation capacity for the adhesive strip when the tire body 10 undergoes dynamic deformation, which helps to disperse stress and reduce fatigue damage. Meanwhile, the spacing L2 between the crests and troughs is no greater than 1 / 2 of the inner circumference of the tire body 10. This ensures that the S-shaped curve of the stress-dispersing rubber strip 22 has sufficient repeatability and coverage in the circumferential direction of the tire body 10. This ensures that the stress-dispersing rubber strip 22 forms an effective stress-dispersing network on the entire inner circumferential surface of the tire body 10, avoiding large blank areas. This ensures that the adhesive force between the sound-absorbing layer and the tire body 10 is fully distributed in both the circumferential and axial directions. In addition, the appropriate spacing also helps the adhesive layer 20 to uniformly transmit and disperse stress when the tire body 10 rotates at high speed and bears loads, improving the overall stability and reliability of the sound-absorbing layer bonding.

[0052] In some embodiments, such as Figure 4As shown, the coating path of the stress-dispersing adhesive strip 22 can be distributed in a cross-line pattern. That is, on the inner circumferential surface of the tire body 10, the coating trajectory of the stress-dispersing adhesive strip 22 consists of at least two intersecting lines, and each line can intersect at different angles, forming multiple intersection points and force transmission paths to provide multi-directional adhesive support and stress dispersion capabilities. This ensures that when the tire body 10 is subjected to circumferential, axial, or radial dynamic stress, the adhesive force can be evenly distributed, avoiding local stress concentration. Specifically, multiple straight paths can be preset using automated adhesive application equipment, intersecting in specific areas. For example, a set of oblique lines at a certain angle to the tire circumference can be applied first, followed by another set of oblique lines at a different angle to the first set, thus forming X-shaped, V-shaped, or more complex geometric cross-shaped patterns. Of course, the adhesive material can also be applied directly to the inner circumferential surface of the tire body 10 in a preset cross-line pattern using spraying or printing technology, utilizing pre-made templates or robot-controlled nozzles.

[0053] In the above embodiments, by designing the coating path of the stress-dispersing adhesive strip 22 as a cross-line distribution, the adhesive layer 20, based on the primary circumferential adhesion provided by the reference adhesive strip 21, further enhances the multi-directional adhesive strength between the sound-dispersing layer and the tire body 10. When the tire body 10 is subjected to dynamic loads and deformations from different directions during driving, such as acceleration, braking, turning, or shear, tensile, and compressive stresses caused by uneven road surfaces, the cross-line distributed stress-dispersing adhesive strip 22 can effectively decompose and disperse these complex stresses throughout the adhesive area. Because the lines intersect, forming multiple support points and force transmission paths, stress is not concentrated on a single-direction adhesive strip, thus avoiding adhesive failure caused by excessive local stress. This multi-directional support ensures that the sound-dispersing layer adheres firmly to the tire body 10 under various operating conditions, improving the reliability and durability of the adhesion.

[0054] In some embodiments, such as Figure 5As shown, the coating path of the stress-dispersing adhesive strip 22 can be distributed in a mesh structure formed by multiple intersecting lines. That is, the stress-dispersing adhesive strip 22 forms a grid-like pattern on the inner circumferential surface of the tire body 10 with interwoven and connected lines. The mesh structure can be composed of regularly arranged rhomboid, square, or hexagonal grids, or it can be a complex network composed of irregular but interconnected lines to provide multi-directional and multi-path stress transmission and dispersion capabilities, thereby enhancing the integrity and stability of the adhesion. By designing the coating path of the stress-dispersing adhesive strip 22 into a mesh structure formed by multiple intersecting lines, the adhesive layer 20 forms a highly interconnected adhesive network on the inner circumferential surface of the tire body 10. When the tire body 10 undergoes circumferential and axial deformation during driving, complex stresses such as shear force and tensile force acting on the sound-absorbing layer can be effectively dispersed and transmitted along multiple paths in the mesh structure, avoiding stress overload in local areas. The inherent redundancy of the mesh structure ensures that even if a minor failure occurs at a local bonding point due to high stress, the surrounding mesh structure can continue to bear and redistribute the load, thereby maintaining the overall bonding integrity between the noise reduction layer and the tire body 10, and significantly improving the peel resistance and durability of the bonding layer 20 under dynamic conditions.

[0055] In some embodiments, such as Figure 2 and Figure 3 As shown, the coating path of the stress-dispersing adhesive strip 22 can be a single oblique line or multiple parallel oblique lines, i.e., as shown in the figure. Figure 2 As shown, the coating path of the stress-dispersing adhesive strip 22 can be applied along a preset single oblique line trajectory or along multiple parallel oblique line trajectories. When the coating path is a single oblique line, only one stress-dispersing adhesive strip 22 can cross the bonding area at an angle of 15°, 30°, 45°, etc., and its angle can be adjusted according to the tire type and expected stress distribution requirements. When the coating path is multiple parallel oblique lines, multiple stress-dispersing adhesive strips 22 can be arranged parallel to each other at the same angle of inclination, covering a wider bonding area, thereby providing a more uniform stress dispersion effect, and the spacing between the strips can be adjusted according to actual needs.

[0056] In the above embodiments, by setting the coating path of the stress-dispersing adhesive strip 22 in the adhesive layer 20 to a single diagonal line or multiple parallel diagonal lines, it works in conjunction with the reference adhesive strip 21 extending circumferentially along the tire body 10 to achieve effective adhesion of the sound-dampening layer. The reference adhesive strip 21 primarily provides adhesive force along the tire circumferential direction, resisting the circumferential shear force generated by tire rolling. The stress-dispersing adhesive strip 22, distributed in a diagonal pattern, has its adhesive force component acting simultaneously on the circumferential and axial directions of the tire body 10. When the tire is subjected to complex dynamic loads during driving, such as the circumferential and axial stresses generated during acceleration, braking, or cornering, the diagonally distributed stress-dispersing adhesive strip 22 can effectively disperse these stresses over a wider area, preventing stress concentration at specific points or lines. Meanwhile, the distribution of multiple parallel diagonal lines can form a uniform stress dispersion network, making the adhesive force more even across the entire bonding surface. This significantly improves the bonding strength and durability between the sound insulation layer and the tire body 10, effectively preventing the sound insulation layer from falling off or failing during long-term use, while also simplifying the coating process.

[0057] In some embodiments, the sound-absorbing layer and the adhesive layer 20 can be cured by hot pressing, that is, heat can be applied while applying pressure to promote the diffusion, cross-linking or melting of material molecules between the adhesive layer 20 and the sound-absorbing layer, thereby forming a stronger chemical bond or physical entanglement. Specifically, the bonding area can be rolled and pressed by heated rollers, or the entire bonding interface can be pressed together by heated flat mold. Of course, the sound-absorbing layer and the adhesive layer 20 can also be cured by local pressure, that is, during the bonding process of the adhesive layer 20 and the sound-absorbing layer, pressure is applied only to specific areas to promote curing or bonding, thereby ensuring sufficient bonding strength in critical areas, while avoiding applying unnecessary pressure or heat to the entire structure. Specifically, a pressure head with a specific shape can be used to locally compact the reference adhesive strip 21 and / or stress-dispersing adhesive strip 22 area of ​​the adhesive layer 20, or a local pressure difference can be formed in a specific area by vacuum bag pressing to promote curing or bonding.

[0058] The terminology used in the above embodiments is for the purpose of describing specific embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0059] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0060] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0061] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0062] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic tire, characterized in that, include: Tire body (10); A sound-absorbing layer is disposed on the inner circumferential surface of the tire body (10); An adhesive layer (20) is used to bond the sound-absorbing layer to the inner circumferential surface of the tire body (10), and the adhesive layer (20) includes at least one reference strip (21) and a stress-dispersing strip (22). The coating path of the reference strip (21) extends circumferentially along the tire body (10), and the coating path of the stress-dispersing strip (22) is distributed on the inner circumferential surface of the tire body (10) in at least one of curves and broken lines, so as to form an adhesive force capable of bonding the sound-absorbing layer in both the circumferential and axial directions of the tire body (10).

2. The pneumatic tire according to claim 1, characterized in that, There are two reference adhesive strips (21), and the two reference adhesive strips (21) are respectively located near the two edges of the soundproof layer. The stress-dispersing adhesive strip (22) is located between the two reference adhesive strips (21).

3. The pneumatic tire according to claim 2, characterized in that, The interval between the two reference rubber strips (21) is not less than 1 mm and not greater than 95% of the total tread width of the tire body (10).

4. The pneumatic tire according to claim 1, characterized in that, The reference adhesive strip (21) is one strip, and the reference adhesive strip (21) is located at the center line of the width direction of the soundproof layer, and stress-dispersing adhesive strips (22) are respectively provided on both sides of the reference adhesive strip (21).

5. The pneumatic tire according to any one of claims 1 to 4, characterized in that, The coating path of the stress-dispersing adhesive strip (22) is distributed as a single S-shaped curve; or, The coating path of the stress-dispersing adhesive strip (22) is distributed in multiple S-shaped curves, and the distribution form of each S-shaped curve includes at least one of parallel distribution, cross distribution and symmetrical distribution.

6. The pneumatic tire according to claim 5, characterized in that, The coating path of the stress-dispersing adhesive strip (22) includes at least one peak and one trough, and the distance between the peak and the trough is not less than 5 mm and not greater than 1 / 2 of the inner circumference of the tire body (10).

7. The pneumatic tire according to any one of claims 1 to 4, characterized in that, The coating path of the stress-dispersing adhesive strip (22) is distributed in a cross-line pattern.

8. The pneumatic tire according to claim 7, characterized in that, The coating path of the stress-dispersing adhesive strip (22) is distributed in a mesh structure formed by multiple intersecting lines.

9. The pneumatic tire according to any one of claims 1 to 4, characterized in that, The coating path of the stress-dispersing adhesive strip (22) is a single oblique line or multiple parallel oblique lines.

10. The pneumatic tire according to claim 1, characterized in that, The sound-absorbing layer and the adhesive layer (20) are cured by hot pressing or local pressure.

11. The pneumatic tire according to claim 1, characterized in that, The sound-absorbing layer is made of porous foam material.

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