Meridian aircraft tire tread reinforcing structure and meridian aircraft tire thereof

Abstract

The invention discloses a radial aircraft tire tread reinforcing structure and a radial aircraft tire thereof, and belongs to the technical field of radial aircraft tires, the radial aircraft tire tread reinforcing structure comprises a belted layer and a cap ply, the belted layer is arranged in the radial direction of a tread layer and the radial direction of a tire body layer, and the belted layer is formed by winding cord fabric strips; the width of the cord fabric strip is smaller than that of the section of the tire; the cap ply is arranged in the radial direction of the tread layer and outside the radial direction of the belted layer, the cap ply is formed by plying cord fabric, and the width of the cord fabric is equal to or larger than that of the section of the tire. The cap ply is arranged on the radial outer side of the belted layer, the belted layer adopts a winding mode, local tension can be reduced, the cap ply adopts a layer attaching mode, gaps caused by the winding mode can be avoided, the tread fastening force is improved, and the manufactured tire has better wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of radial aircraft tires, in particular to a radial aircraft tire tread reinforcement structure and a radial aircraft tire thereof. Background Art

[0002] In the aviation industry, tires are key components in the take-off and landing process of aircraft, and their performance and safety are of vital importance. Radial tires are widely used in aircraft tires due to their unique structural design and excellent load-bearing performance. The characteristics of this type of tire are that its belt layer is inclined at an angle of 2° to 5° to the circumferential direction, the direction of the carcass cord is nearly 90° perpendicular to the crown centerline, and the carcass layer cords are arranged parallel to the meridian direction. The belt layer is made of high modulus cord material, which can effectively withstand 60% to 75% of the total stress of the tire, while the circumferential stress is almost entirely borne by the belt layer. This structural design gives aircraft tires stability and durability under high-speed and high-load operating conditions.

[0003] However, with the rapid development of the aviation industry, the problems faced by aircraft tires during use have become increasingly prominent. In particular, after repeated taxiing, takeoffs and landings, the tread wear becomes more and more obvious. This not only affects the service life of the tire, but also poses a potential threat to flight safety. In order to meet the high requirements of modern aircraft for tire performance, especially the demanding standards in terms of weight and burst pressure, tire manufacturers are constantly seeking technological innovation and improvement.

[0004] When the tire is inflated to the rated pressure, its crown structure presents a rounded profile along the meridian plane. This profile often leads to uneven distribution of tread contact pressure, which in turn exacerbates tread wear problems. To improve this situation, attempts have been made to make the crown flatter by increasing the tire's lower layer ratio. However, this approach often requires adding additional material, which increases the size and weight of the tire, which is contrary to the demand for lightweight design in modern aircraft. On the other hand, reducing material in other locations, while helping to reduce size and weight, may cause the tire to fail to meet the burst pressure requirements.

[0005] In order to resolve these contradictions, the industry began to explore the use of special materials, such as high-strength nylon cords made of aliphatic polyamide, to enhance the strength of tires. However, these new materials often lead to a decrease in the rubber adhesion of the tire tread under the conventional winding method. At the same time, due to the high load, local tension differences are easily generated between the materials in the crown of the tire, further exacerbating the occurrence of wear problems.

[0006] In summary, when facing challenges in tread wear, weight control and burst pressure requirements, current aviation radial tires are in urgent need of an innovative technical solution. Summary of the invention

[0007] The purpose of the present invention is to provide a radial aircraft tire tread reinforcement structure and a radial aircraft tire thereof, so as to solve the problems existing in the above-mentioned prior art. A cap layer is arranged on the radial outer side of the belt layer. The belt layer adopts a winding form, which can reduce local tension. The cap layer adopts a layer-pasting form, which can avoid the gap caused by the winding form and improve the tread tightening force. The tire manufactured has better wear resistance.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a tread reinforcement structure of a radial aircraft tire, comprising a belt layer and a cap layer, wherein the belt layer is arranged radially inwardly of the tread layer and radially outwardly of the carcass layer, the belt layer is made by winding a cord strip, and the width of the cord strip is less than the tire section width; the cap layer is arranged radially inwardly of the tread layer and radially outwardly of the belt layer, the cap layer is made by pasting a cord sheet layer, and the width of the cord sheet is equal to or greater than the tire section width.

[0010] In one embodiment, the belt layer is provided with at least four layers, and the cap layer is provided with at least one layer.

[0011] In one embodiment, the width of the cord strip is 10 mm to 30 mm, and the thickness of the cord strip is 1.0 mm to 3.0 mm.

[0012] In one embodiment, the material of the cord strip includes aliphatic polyamide and / or aromatic polyamide.

[0013] In one embodiment, the cord strip is 2° to 5° with the center line of the machine head.

[0014] In one embodiment, the thickness of the cord fabric piece is 1.0 mm to 3.0 mm.

[0015] In one embodiment, the material used for the cord sheet includes aliphatic polyamide.

[0016] In one embodiment, the cord piece is at an angle of 10° to 15° to the center line of the machine head.

[0017] In one embodiment, the end portion of the cap layer in the width direction extends beyond the end portion of the belt layer in the width direction, and the extension width is 5 mm to 50 mm.

[0018] The present invention also provides a radial aircraft tire, comprising a carcass layer, a tread layer, and a radial aircraft tire tread reinforcement structure as described above located between the carcass layer and the tread layer, wherein the carcass layer, the belt layer, the cap layer, and the tread layer are arranged sequentially from radially inward to radially outward.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The present invention arranges a cap layer on the radial outer side of the belt layer. The belt layer adopts a winding form, which can reduce local tension. The cap layer adopts a layer-pasting form, which can avoid gaps caused by the winding form and improve the tread fastening force. The tire manufactured has better wear resistance.

[0021] The tire of the present invention not only meets the stringent requirements of modern aircraft on weight and bursting pressure, but also can significantly improve the service life and safety of the tire, providing strong support for the sustainable development of the aviation industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 Schematic diagram of the belt layer and the cap layer in the embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a tire cross section in an embodiment of the present invention;

[0025] Among them, 1. tread layer; 2. cap layer; 3. belt layer; 4. carcass layer;

[0026] L is the width of the entire belt layer of the tread; X is the center line of the nose; B is the angle between the cap layer and the center line of the nose; A is the angle between the belt layer and the center line of the nose; C is the length of the width of the cap layer covering more than the end of the belt layer. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a radial aircraft tire tread reinforcement structure and a radial aircraft tire thereof, so as to solve the problems existing in the prior art. A cap layer is arranged on the radial outer side of the belt layer. The belt layer adopts a winding form, which can reduce local tension. The cap layer adopts a layer-pasting form, which can avoid gaps caused by the winding form and improve the tread tightening force. The tire manufactured has better wear resistance.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 and Figure 2 As shown, the present invention provides a tread reinforcement structure of a radial aircraft tire, including a belt layer 3 and a cap layer 2. The belt layer 3 is arranged radially inward of the tread layer 1 and radially outward of the carcass layer 4. The belt layer 3 is made by winding a cord strip, and the cord strips extend parallel to each other in the belt layer 3. The cord strip is made to have a certain width as required, and the width of the cord strip should be less than the tire section width (i.e., the axial width of the tire). The front and back sides of the cord strip can be coated with glue, and after the winding is completed, they are bonded as a whole. The cap layer 2 is arranged radially inward of the tread layer 1 and radially outward of the belt layer 3. The cap layer 2 is made by pasting a cord sheet layer. The cord sheet is made to have a certain width as required, and the width of the cord sheet should be equal to or greater than the tire section width (i.e., the axial width of the tire). The front and back sides of the cord sheet can be coated with glue, and after the layer pasting is completed, they are bonded as a whole. Since the width of the cord sheet used in the cap layer 2 is wider than the cord strip, the cap layer 2 does not need to be wound multiple times when it is set. Each layer only needs to be wound once to cover the entire tire section width. Therefore, there is no splicing gap in the cap layer 2.

[0031] The present invention arranges a cap layer 2 radially outside the belt layer 3. The belt layer 3 is in a winding form, which can reduce local tension. The cap layer 2 is in a layer-pasted form, which can avoid gaps caused by the winding form and improve the tread fastening force. The tire manufactured has better wear resistance.

[0032] In addition, compared with the traditional winding method, the layer-pasting method can effectively avoid gaps between the cord strips, and reduce weight while maintaining consistent line density.

[0033] In one embodiment, the belt layer 3 is provided with at least four layers, and the cross-sectional widths of the belt layers 3 of different layers may be inconsistent, so as to form a curved surface of the tire at the end. The cap layer 2 is provided with at least one layer, and whether it is provided with one layer or multiple layers, it is sufficient to wrap the entire belt layer 3; preferably, one layer is provided. In the prior art, the cap layer 2 is wound in a winding manner and is generally designed as two layers of cord strips. In the present invention, the cap layer 2 is pasted in a layer-by-layer manner and is provided as a layer of cord sheet. A large amount of engineering experience shows that the cap layer 2 pasted in layers has an advantage in weight over the cap layer 2 wound in two layers. Therefore, the cap layer 2 structure of the present invention can reduce weight while ensuring strength and wear resistance.

[0034] In one embodiment, the width of the cord strip in the belt layer 3 is 10 mm to 30 mm, and the thickness of the cord strip after rubber coating is 1.0 mm to 3.0 mm.

[0035] In one embodiment, the cord strips in the belt layer 3 are made of aliphatic polyamide and / or aromatic polyamide, and a mixed belt layer 3 can be formed. The cords made of aliphatic polyamide and aromatic polyamide are made into nylon / aramid composite cord strips, and the breaking strength of the nylon / aramid composite cord is ≥550N / piece.

[0036] In one embodiment, the cord strips in the belt layer 3 are at an angle of 2° to 5° to the center line of the machine head.

[0037] In one embodiment, the thickness of the cord fabric piece in the cap layer 2 after rubber coating is 1.0 mm to 3.0 mm.

[0038] In one embodiment, the material used for the cord fabric piece in the cap layer 2 includes aliphatic polyamide, which can form a non-mixed cap layer 2. The cord made of aliphatic polyamide is made into a high-strength nylon cord fabric piece, and the breaking strength of the high-strength nylon cord is ≥450N / piece.

[0039] In one embodiment, the cord piece of the cap layer 2 is at an angle of 10° to 15° to the center line of the machine head.

[0040] In one embodiment, the end portion of the band ply 2 in the width direction extends beyond the end portion of the belt ply 3 in the width direction, and the extension width is 5 mm to 50 mm.

[0041] In one embodiment, the belt layer 3 is arranged from wide to narrow from the inner diameter side to the outer diameter side within a certain thickness range, forming Figure 2 In the cross-sectional structure shown, the total thickness of the multi-layer cord strip is at most 30 mm.

[0042] The present invention also provides a radial aircraft tire, comprising a carcass layer 4, a tread layer 1, and a radial aircraft tire tread reinforcement structure as described above located between the carcass layer 4 and the tread layer 1, wherein the carcass layer 4, the belt layer 3, the cap layer 2, and the tread layer 1 are arranged sequentially from radially inward to radially outward.

[0043] The present invention provides embodiments as follows:

[0044] like Figure 1 As shown, the belt layer 3 and the cap layer 2 arranged on the tread part are structurally improved, and the remaining structure adopts the normal radial aircraft tire structure design.

[0045] The tread is equipped with 12 belt layers 3, which are all composed of nylon / aramid composite cord strips with a width of 15mm and a thickness of 1.0-3.0mm. The wider the cord strips used in the belt layer 3, the higher the number of interfaces between the axial end cord strips and the higher the thickness, the higher the risk of tire tread cracking. In order to ensure the overall firmness and durability of the tread, a cap layer 2 with a width of 230mm and a thickness of 1.0-3.0mm composed of high-strength nylon cords is set above the belt layer 3, and the end of the cap layer 2 covers the end of the belt layer 3 by 10mm. The gap formed by the winding form is effectively reduced in the form of layer pasting, the tightening force of the tread is improved, and it plays a good role in reinforcing the tread.

[0046] A tire with a diameter of 1000 mm was prepared according to the above preparation method. The tread reinforcement structure scheme successfully passed the dynamic simulation test after testing. Compared with the original wrapped cap layer radial aviation tire, it has a huge advantage in weight.

[0047] Therefore, the radial aircraft tire using the above tread reinforcement structure effectively improves the wear resistance of the tread of the radial aircraft tire, improves the overall performance of the radial aircraft tire, and meets the requirements of aircraft use and maintenance.

[0048] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A radial aircraft tire tread reinforcement structure, characterized in that: include: A belt layer, wherein the belt layer is arranged radially inwardly of the tread layer and radially outwardly of the carcass layer, and the belt layer is made by winding a cord strip, and the width of the cord strip is smaller than the tire section width; and a cap layer, wherein the cap layer is arranged radially inwardly of the tread layer and radially outwardly of the belt layer, and the cap layer is made of a cord fabric layer, and the width of the cord fabric layer is equal to or greater than the tire section width.

2. The radial aircraft tire tread reinforcement structure according to claim 1, characterized in that: The belt layer is provided with at least four layers, and the cap layer is provided with at least one layer.

3. The radial aircraft tire tread reinforcement structure according to claim 1, characterized in that: The width of the cord strip is 10 mm to 30 mm, and the thickness of the cord strip is 1.0 mm to 3.0 mm.

4. The radial aircraft tire tread reinforcement structure according to claim 3, characterized in that: The material used for the cord strips includes aliphatic polyamide and / or aromatic polyamide.

5. The radial aircraft tire tread reinforcement structure according to claim 1, characterized in that: The cord strip is 2° to 5° with the center line of the machine head.

6. The radial aircraft tire tread reinforcement structure according to claim 1, characterized in that: The thickness of the cord fabric piece is 1.0 mm to 3.0 mm.

7. The radial aircraft tire tread reinforcement structure according to claim 6, characterized in that: The material used for the cord fabric sheet includes aliphatic polyamide.

8. The radial aircraft tire tread reinforcement structure according to claim 1, characterized in that: The angle between the cord piece and the center line of the machine head is 10° to 15°.

9. The radial aircraft tire tread reinforcement structure according to claim 1, characterized in that: The end portion of the cap layer in the width direction extends beyond the end portion of the belt layer in the width direction, and the extension width is 5 mm to 50 mm.

10. A radial aircraft tire, characterized by: The radial aircraft tire tread reinforcement structure comprises a carcass layer, a tread layer and a portion between the carcass layer and the tread layer as described in any one of claims 1 to 9, wherein the carcass layer, the belt layer, the cap layer and the tread layer are sequentially arranged from radially inside to radially outside.

Images