Wave-shaped protective layer, manufacturing method of wave-shaped protective layer and radial tire

Abstract

The invention discloses a wave-shaped protective layer, a wave-shaped protective layer manufacturing method and a radial tire, and belongs to the technical field of aircraft tires, the wave-shaped protective layer comprises wave-shaped cord fabric with the surface coated with rubber, and the wave-shaped cord fabric is used for being arranged between a cap ply layer and a reinforcing rubber layer of the radial tire. The corrugated cord fabric can be covered by the cap ply in the width direction of the radial tire, the waveform of the corrugated cord fabric extends in the circumferential direction of the radial tire, and the plane where the waveform of the corrugated cord fabric is located is perpendicular to the axis direction of the radial tire. The manufacturing method comprises the following steps: penetrating a waveform fiber cord thread into a thread arranging device, arranging according to a sine curve path, and manufacturing a waveform cord fabric; and rolling equipment is adopted to perform rubber coating and rolling on the corrugated cord fabric to form the corrugated protective layer. The radial tire comprises a tread layer, a cap ply, a wave-shaped protective layer, a reinforcing rubber layer and a belted layer which are sequentially arranged from outside to inside in the radial direction. The waveform protective layer is arranged, so that foreign object puncture resistance and mechanical damage resistance of the tire can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft tires, and particularly to a waveform protection layer, a method for manufacturing the waveform protection layer, and a radial tire. Background Art

[0002] An aircraft radial tire is a key component during the takeoff and landing of an aircraft and needs to withstand huge impact loads, high accelerations, and severe dynamic deformations. Since the impact force when the aircraft lands is extremely large, the tire must meet strict performance requirements such as high load-bearing capacity, impact resistance, and deformation resistance.

[0003] Currently, the typical structure of an aircraft radial tire from the outside to the inside in the radial direction is a tread layer, a crown ply, a reinforcing rubber layer, and a belt layer in sequence. Among them, although the crown ply can improve the anti-mechanical damage ability of the tire, its puncture resistance is still significantly insufficient. During the takeoff and landing of the aircraft, small foreign objects or sharp objects on the runway can easily penetrate the tread and even puncture the crown ply, further damaging the internal belt layer, resulting in tire structure failure and seriously affecting flight safety. In the prior art, the material or structural design of the crown ply has limited blocking effect on foreign objects and is difficult to effectively disperse or absorb the piercing stress, making the tire vulnerable to damage under complex road conditions. Therefore, it is urgent to optimize the structural design of the aircraft radial tire and enhance its anti-foreign object piercing ability to improve reliability and service life. Summary of the Invention

[0004] The object of the present invention is to solve the above technical problems and provide a waveform protection layer, a method for manufacturing the waveform protection layer, and a radial tire. The waveform protection layer is arranged between the crown ply and the reinforcing rubber layer of the radial tire, and can improve the performance of the radial tire in withstanding large loads, large accelerations, and large impact deformations, as well as improve the tire's anti-foreign object puncture and anti-mechanical damage performance.

[0005] To achieve the above object, the present invention provides the following solution: The present invention discloses a waveform protection layer, which includes a waveform cord fabric with a surface rubber coating. The waveform cord fabric is used to be arranged between the crown ply and the reinforcing rubber layer of the radial tire. The waveform cord fabric can be covered by the crown ply in the width direction of the radial tire. The waveform of the waveform cord fabric extends along the circumferential direction of the radial tire, and the plane where the waveform of the waveform cord fabric is located is perpendicular to the axial direction of the radial tire.

[0006] Preferably, the waveform cord fabric has a preset width, and the preset width makes the wide side of the waveform cord fabric located between the tire shoulder and the outermost tread groove of the radial tire.

[0007] Preferably, the waveform cord fabric includes a plurality of waveform fiber cords arranged at intervals side by side, and the waveforms of the plurality of waveform fiber cords are the same.

[0008] Preferably, the spacing of the corrugated fiber cord is 2.7 mm to 3.6 mm, the wave amplitude is 7 mm to 8 mm, and the wavelength is 20 mm to 30 mm.

[0009] Preferably, the corrugated fiber cord is a composite aramid cord.

[0010] Preferably, the thickness of the rubber covering layer of the corrugated fabric is 1.5 mm to 3 mm.

[0011] A method for manufacturing a corrugated protective layer is also disclosed, including the following steps:

[0012] Thread the corrugated fiber cord into a wire arranging device and arrange it along a sinusoidal curve path to manufacture a corrugated fabric;

[0013] Use a calendering device to perform rubber calendering on the corrugated fabric to form a corrugated protective layer.

[0014] A radial tire is also disclosed, including a tread layer, a crown belt layer, a reinforcing rubber layer, and a belt layer arranged in sequence from outside to inside in the radial direction. The above-mentioned corrugated protective layer is provided between the crown belt layer and the reinforcing rubber layer.

[0015] Preferably, there is a spacing of 10 mm to 25 mm between the end of the crown belt layer and the end of the corrugated protective layer in the width direction of the radial tire.

[0016] Preferably, the angle of the butt joint of the corrugated protective layer is 45°, and the butt joint is wrapped and compacted with a thin rubber sheet.

[0017] The present invention has achieved the following technical effects compared with the prior art:

[0018] In the present invention, by adding a corrugated protective layer between the crown belt layer and the reinforcing rubber layer of the radial tire, the corrugated protective layer can form a series of alternately arranged depressions (wave troughs) and protrusions (wave crests) on the circumference of the tire. Using the depressions can form a buffer zone to effectively disperse or absorb the piercing stress, improve the anti-external object puncture and mechanical damage performance of the tire, and improve the performance of the radial tire in bearing large loads, large accelerations, and large impact deformations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the structural positional relationship of the radial tire in the embodiment of the present invention;

[0021] Figure 2 It is a schematic cross-sectional structure diagram of a radial tire in an embodiment of the present invention;

[0022] Figure 3 It is a schematic cross-sectional structure diagram of a waveform protection layer in an embodiment of the present invention;

[0023] Figure 4 It is a three-dimensional structure diagram of the arrangement of corrugated lines of a waveform cord fabric in an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the interface joint of the waveform protection layer in an embodiment of the present invention;

[0025] Figure 6 It is a schematic structure diagram of the waveform protection layer in the circumferential direction of the tire in an embodiment of the present invention.

[0026] Explanation of reference numerals: 1, tread layer; 2, crown belt layer; 3, waveform protection layer; 4, reinforcing rubber layer; 5, belt layer; 6, sealing rubber; 7, tread groove; 8, rubber covering layer; 9, waveform cord fabric. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0028] The purpose of the present invention is to provide a waveform protection layer, a method for manufacturing a waveform protection layer, and a radial tire to solve the problems existing in the prior art. By adding a waveform protection layer between the crown belt layer and the reinforcing rubber layer of the radial tire, the waveform protection layer can form a series of alternately arranged depressions (troughs) and protrusions (peaks) on the circumference of the tire. The use of a series of depressions can form a buffer zone to effectively disperse or absorb the puncturing stress, improve the performance of the tire against foreign object punctures and mechanical damages, and improve the performance of the radial tire in bearing large loads, large accelerations, and large impact deformations.

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0030] Embodiment 1

[0031] As Figures 1 to 6As shown in the figure, this embodiment provides a corrugated protective layer, which includes a corrugated cord fabric 9, and a rubber-coated layer 8 is formed on the surface of the corrugated cord fabric 9. The corrugated cord fabric 9 is used to be arranged between the belt layer 2 and the reinforcing rubber layer 4 of the radial tire. The corrugated cord fabric 9 can be covered by the belt layer 2 in the width direction of the radial tire to provide a certain degree of protection for the corrugated cord fabric 9. The corrugations of the corrugated cord fabric 9 extend along the circumferential direction of the radial tire, that is, along the rolling direction of the radial tire. The plane where the corrugations of the corrugated cord fabric 9 are located is perpendicular to the axis direction of the radial tire. The corrugated cord fabric 9 forms a series of alternately arranged depressions and protrusions on the circumference of the tire (refer to Figure 4 and Figure 6 ). By using a series of depressions, a buffer zone can be formed to effectively disperse or absorb the puncturing stress and improve the puncture and mechanical damage resistance of the tire. By changing the parameters of the wavelength, amplitude and thickness of the corrugated protective layer 3, it is possible to adapt to radial tires of different models and specifications, especially aviation radial tires.

[0032] In one embodiment, the corrugated cord fabric 9 has a preset width, and this preset width enables the wide side of the corrugated cord fabric 9 to be located between the tire shoulder and the outermost tread groove 7 of the radial tire. The above design can ensure that when the tire encounters complex working conditions, the corrugated protective layer 3 can effectively protect the structure at the crown of the tire and play a role in improving the puncture resistance.

[0033] In one embodiment, the corrugated cord fabric 9 includes a plurality of corrugated fiber cord fabrics arranged at intervals side by side. The corrugations of the plurality of corrugated fiber cord fabrics are the same, that is, the wavelength and amplitude are the same, and the corrugated fiber cord fabrics are arranged neatly along the width direction of the corrugated cord fabric 9 to form a series of wave crests (protrusions) and wave troughs (depressions) on the surface of the corrugated cord fabric 9. The number of corrugated fiber cord fabrics is set according to the preset width of the corrugated cord fabric 9.

[0034] In one embodiment, the spacing of the corrugated fiber cord fabrics is 2.7 mm to 3.6 mm, the amplitude is 7 mm to 8 mm, and the wavelength is 20 mm to 30 mm.

[0035] In one embodiment, the corrugated fiber cord fabrics are made of high-strength fiber cord fabrics and are rubber-coated, and are calendered by professional calendering equipment according to a certain amplitude, wavelength and a certain width.

[0036] In one embodiment, the corrugated fiber cord fabrics are made of composite aramid cord fabrics. Preferably, the specification can be a composite cord fabric of aramid 1670 dtex / 2 + nylon 66 2100 dtex / 1. This composite cord fabric has higher strength and can better meet the structural design requirements of aviation tires under complex working conditions.

[0037] In one embodiment, the thickness of the rubber-coated layer 8 of the corrugated cord fabric 9 is 1.5 mm to 3 mm, that is, the total thickness of the corrugated protective layer 3 is 1.5 mm to 3 mm.

[0038] In one embodiment, the rubber-coated layer 8 uses a mixed rubber with an elongation at break greater than or equal to 450% and a tensile strength greater than or equal to 24 MPa.

[0039] Example 2

[0040] As Figures 1 to 6 shown, this embodiment provides a method for manufacturing a corrugated protective layer, including the following steps:

[0041] Insert the corrugated fiber cord into the wire arranging device and arrange it along a sine curve path to make the corrugated cord fabric 9;

[0042] Use a calendering device to calender the corrugated cord fabric 9 to form a corrugated cord fabric 9 coated with a rubber-coated layer 8, and complete the production of the corrugated protective layer 3.

[0043] In one embodiment, each corrugated fiber cord is inserted into the wire arranging device. The wave amplitude is mainly formed by the wire arranging device arranging along a sine curve path, and the wavelength is mainly determined by the cord inlet speed. Such cord selection and arrangement significantly improve the puncture resistance of the corrugated protective layer 3.

[0044] In one embodiment, a composite aramid cord is used, and the specification is a composite cord of aramid 1670 dtex / 2 + nylon 66 2100 dtex / 1. This composite cord has higher strength and can better meet the structural design requirements of aircraft tires under complex working conditions. According to different processes, the cord spacing is 2.7 mm to 3.6 mm, the wave amplitude is 7 mm to 8 mm, the wavelength is 20 mm to 30 mm, and the upper and lower surfaces of the cord need to be rubber-coated, and the total thickness is controlled at 1.5 mm to 3 mm. The total number of cords is calculated from the width of the designed corrugated protective layer 3.

[0045] In one embodiment, the rubber-coated material uses a mixed rubber with an elongation at break greater than or equal to 450% and a tensile strength greater than or equal to 24 MPa. Through experiments, the mixed rubber under this parameter can strengthen the adhesion performance between the rubber compound and the composite aramid fiber in the corrugated protective layer 3, improve the puncture resistance of the tire, and improve the stress distribution.

[0046] In one embodiment, the entire calendering process is carried out using a professional calendering device, and after calendering, it is wound with a PE film. Winding with a PE film can better preserve the corrugated protective layer 3, so that the corrugated protective layer 3 can be preserved for a long time and still have good ductility, which is convenient for the laminating process.

[0047] Example 3

[0048] As Figures 1 to 6As shown in the figure, this embodiment provides a radial tire, which includes a tread layer 1, a crown ply 2, a corrugated protection layer 3 in Embodiment 1, a reinforcing rubber layer 4, and a belt layer 5 arranged in sequence from outside to inside along the radial direction. The crown ply 2 covers the corrugated fabric 9 in the width direction of the radial tire. The corrugations of the corrugated fabric 9 extend along the circumferential direction of the radial tire. The plane where the corrugations of the corrugated fabric 9 are located is perpendicular to the axis direction of the radial tire. The corrugated fabric 9 forms a series of alternately arranged depressions and protrusions on the circumference of the tire (refer to Figure 4 and Figure 6 ). By using a series of depressions, a buffer zone can be formed to effectively disperse or absorb the puncturing stress, and improve the performance of the tire against foreign object puncture and mechanical damage. By changing the parameters of the wavelength, amplitude, and thickness of the corrugated protection layer 3, it can be adapted to radial tires of different models and specifications, especially aviation radial tires. The number of the corrugated protection layers 3 is set according to needs, usually one or two corrugated protection layers 3. It can be an automotive radial tire or an aviation radial tire.

[0049] In an embodiment, there is a distance of 10 mm to 25 mm between the end of the crown ply 2 and the end of the corrugated protection layer 3 in the width direction of the radial tire, that is, the end of the crown ply 2 extends beyond the end of the corrugated protection layer 3 by a distance of 10 mm to 25 mm. The crown ply 2 should not cover the corrugated protection layer 3 too long, as it will cause the end position of the crown ply 2 to be closer to the shoulder, resulting in stress concentration at the shoulder and affecting the force structure of the tire. In an embodiment, the end of the corrugated protection layer 3 in the width direction of the radial tire (i.e., the wide side of the corrugated fabric 9) is located between the shoulder and the outermost tread groove 7. This design can ensure that when the tire encounters complex working conditions, the corrugated protection layer 3 can effectively protect the structure at the crown of the tire and play a role in improving the puncture resistance performance.

[0050] In an embodiment, the angle of the butt joint of the corrugated protection layer 3 is 45°. The butt joint is wrapped with a thin film and compacted. The corrugated protection layer 3 needs to be circumferentially laminated on the reinforcing rubber layer 4 on the outermost belt layer 5 in a wound cylindrical shape. It is laminated in a circumferential circle, the butt joint angle is 45°, the interface part is wrapped with a thin film, and the butt joint is compacted. The above lamination process can make the corrugated protection layer 3 evenly cover the reinforcing rubber layer 4 and improve the strength of the butt joint.

[0051] In an embodiment, a sealing gum 6 is provided between the reinforcing rubber layer 4 and the belt layer 5.

[0052] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A waveform protection layer, characterized in that, It includes a corrugated cord fabric with surface rubber coating, and the corrugated cord fabric is used to be arranged between the belt layer and the reinforcing rubber layer of a radial tire. The corrugated cord fabric can be covered by the belt layer in the width direction of the radial tire. The corrugations of the corrugated cord fabric extend along the circumferential direction of the radial tire, and the plane where the corrugations of the corrugated cord fabric are located is perpendicular to the axis direction of the radial tire.

2. The waveform protection layer according to claim 1, characterized in that, The corrugated cord fabric has a preset width, and the preset width makes the wide sides of the corrugated cord fabric located between the shoulder of the radial tire and the outermost tread groove.

3. The waveform protection layer according to claim 1 or 2, characterized in that, The corrugated cord fabric includes a plurality of corrugated fiber cord wires arranged at intervals side by side, and the corrugations of the plurality of corrugated fiber cord wires are consistent.

4. The waveform protection layer according to claim 3, characterized in that, The spacing between the corrugated fiber cord wires is 2.7 mm to 3.6 mm, the wave amplitude is 7 mm to 8 mm, and the wavelength is 20 mm to 30 mm.

5. The waveform protection layer according to claim 3, characterized in that, The corrugated fiber cord wires adopt composite aramid cord wires.

6. The waveform protection layer according to claim 4, wherein The thickness of the rubber coating layer of the corrugated cord fabric is 1.5 mm to 3 mm.

7. A method for manufacturing a waveform protection layer, characterized in that, It includes the following steps: Thread the corrugated fiber cord wires into a wire arranging device and arrange them along a sine curve path to make a corrugated cord fabric. Use a calendering device to calender the corrugated cord fabric to form a corrugated protective layer.

8. A radial tire, comprising a tread layer, a crown belt layer, a reinforcing rubber layer and a belt layer which are sequentially arranged from outside to inside in the radial direction, characterized in that, A corrugated protective layer as described in any one of claims 1-6 is provided between the belt layer and the reinforcing rubber layer.

9. The radial tire according to claim 8, wherein There is a spacing of 10 mm to 25 mm between the end of the belt layer and the end of the corrugated protective layer in the width direction of the radial tire.

10. The radial tire according to claim 8, wherein The angle of the butt joint of the corrugated protective layer is 45°, and the butt joint is edge-wrapped and compacted with a thin film.

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