Tire bead structure and diagonal tire

Abstract

The utility model provides a tire bead structure and a diagonal tire, and relates to the technical field of aircraft tire structure design, the tire bead structure comprises a steel wire ring, steel wire ring winding cloth, tire bead core wrapping cloth, a tire bead core rubber sheet and a tire body cord fabric layer, the steel wire ring winding cloth wraps the outer side of the steel wire ring; the bead core wrapping cloth wraps the outer side of the bead ring winding cloth; the tire bead core rubber sheet wraps the outer side of the tire bead core wrapping cloth, the end of the tire bead core rubber sheet extends to the end of the tire bead core wrapping cloth, and the end of the tire bead core rubber sheet covers the end of the tire bead core wrapping cloth; the tire body cord fabric layer covers the outer side of the tire bead core rubber sheet; the tire bead core rubber sheet is arranged between the tire bead core wrapping cloth and the tire body cord fabric layer, so that the tire bead core wrapping cloth and the end head of the tire body cord fabric layer can be effectively isolated, the damage of a tire bead part caused by stress concentration of the end head of the cord fabric is avoided, and the speed performance and the fatigue resistance of the tire in the long-distance running process are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to aviation tire structure design technical field, especially a kind of bead structure and bias tire. BACKGROUND

[0002] In the field of aviation, aviation tire as the key component to ensure flight safety, plays a vital role. It is assembled with wheel and brake device on the landing gear of aircraft, not only undertakes the taxiing task when aircraft takes off and lands, but also needs to bear the huge load from the ground, and effectively slows down the impact force when landing, protects the safety of aircraft and passengers. The special structure of aviation tire combines high-performance cord, steel wire and other reinforced framework materials and functional rubber materials, forming a complex structure system including tread, sidewall, carcass and bead, and each part plays an indispensable function.

[0003] Traditionally, small size aviation tire, especially those used for unmanned aerial vehicle, adopts bias structure, which has shown good adaptability and reliability in previous applications. However, with the continuous progress of aviation technology, the take-off and landing speed and load capacity of aircraft are continuously improved, combined with the wide application of new brake systems such as electric brake, more stringent requirements are put forward for the design of aviation tire. Especially in the process of long-distance taxiing, small size tire is prone to stress concentration due to the small radius of the bead part, and the distribution of bead core wrap and carcass ply end is dense, which is prone to damage in high-speed rotation, eventually causing tire damage.

[0004] Therefore, a small size high-speed long taxiing distance bias tire must be designed. SUMMARY

[0005] The utility model aims at providing a kind of bead structure and bias tire to solve the problems existing in the prior art, by setting up bead core rubber sheet between bead core wrap and carcass ply, the end of bead core wrap and carcass ply can be effectively insulated, to avoid the damage of bead part caused by stress concentration of ply end, improve the speed performance and fatigue resistance of tire in the process of long-distance taxiing.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] A kind of bead structure, including bead wire, bead wire wrapping, bead core wrapping, bead core rubber sheet and body ply, the bead wire wrapping is covered in the outside of the bead wire;The bead core wrapping is covered in the outside of the bead wire wrapping;The bead core rubber sheet is covered in the outside of the bead core wrapping, the end of the bead core rubber sheet extends the end position of the bead core wrapping, and the end of the bead core rubber sheet covers the end of the bead core wrapping;The body ply is covered in the outside of the bead core rubber sheet.

[0008] As an embodiment, the end difference of the bead core wrapping is 5mm-10mm, and the end difference of the bead core rubber sheet is 4mm-8mm.

[0009] As an embodiment, the width of the bead wire wrapping is 20±4mm, the width of the bead core wrapping is 55±6mm, and the width of the bead core rubber sheet is 60±6mm.

[0010] As an embodiment, the hanging rubber thickness of the body ply is 0.85mm-1.0mm.

[0011] The embodiment also discloses a bias tire, including the above-mentioned bead structure, the body ply is also distributed in the crown portion and the side portion of the bias tire, the crown portion of the bias tire is also provided with a body reinforcing layer, and the body reinforcing layer is located outside the body ply.

[0012] As an embodiment, the hanging rubber thickness of the body reinforcing layer is 1.0mm-1.2mm.

[0013] As an embodiment, the bias tire further includes an innermost air tight layer rubber in the radial direction.

[0014] As an embodiment, the thickness of the air tight layer rubber is 2.0mm-2.2mm.

[0015] As an embodiment, the cross-sectional profile of the bias tire includes a first circular arc segment, a second circular arc segment, a third circular arc segment and a fourth circular arc segment, the first circular arc segment is located at the position of the crown portion, the center of the first circular arc segment is located on the center line of the tire cross section, the radius of the first circular arc segment is 115±10mm, and the arc length is 27±5mm;The fourth circular arc segment is located in the side portion of the bias tire, the center of the fourth circular arc segment is located on the center horizontal axis of the tire cross section, the radius of the fourth circular arc segment is 60±5mm, and the arc length is 33±3mm;The first circular arc segment is connected in turn through the second circular arc segment, the third circular arc segment and the fourth circular arc segment, the radius of the second circular arc segment is 60±5mm, the arc length is 12±4mm, the radius of the third circular arc segment is 25±5mm, and the arc length is 15±4mm.

[0016] As an embodiment, the fourth circular arc segment is connected to the outer profile of the bead structure by a fifth circular arc segment, the center of the fifth circular arc segment is located on the central horizontal axis of the tire cross section, the radius of the fifth circular arc segment is 143±5mm, and the arc length of the fifth circular arc segment is 34±5mm.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] The utility model discloses a tire bead core rubber sheet is arranged between the tire bead core cover cloth and the tire body cord layer, can effectively insulate the end of tire bead core cover cloth and tire body cord layer, avoids the stress concentration of cord end and causes the damage of bead portion, improves the speed performance and fatigue resistance of tire in long distance sliding process.

[0019] The other technical schemes in the utility model have the following technical effects compared with the prior art:

[0020] The utility model discloses the optimization of tire body contour, improves the bending stress of larger shoulder position, makes tire crown more flat, can increase the ground contact area, reduces the ground stress, improves the speed performance of tire. DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment, and obviously, the drawing in the following description is only some embodiments of the utility model, and for the ordinary skilled person in the art, other drawings can also be obtained according to these drawings without the creative labor.

[0022] Fig. 1 It is the profile comparison schematic view of bias tire and prior art tire in an embodiment of the utility model;

[0023] Fig. 2 It is the structure schematic view of bias tire in an embodiment of the utility model;

[0024] Fig. 3 It is the material distribution schematic view of finished product tire and semi-finished product tire of bias tire in an embodiment of the utility model;

[0025] Fig. 4 It is the bead structure schematic view of bias tire in an embodiment of the utility model.

[0026] Explanation of the drawing mark:

[0027] 1, bead wire; 2, bead core wrap; 3, bead core rubber; 4, carcass ply; 5, bead wire wrap; 6, bead structure; 7, crown portion; 8, sidewall portion; 9, carcass reinforcement; 10, inner liner rubber; 11, center line; 12, center horizontal axis; 13, apex. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] The purpose of the present application is to provide a kind of bead structure, to solve the problems existing in prior art, by setting up bead core rubber between bead core wrap and carcass ply, it can effectively isolate the end of bead core wrap and carcass ply, avoid the damage of bead portion caused by the stress concentration of ply end, improve the speed performance and fatigue resistance of tire in the process of long distance sliding.

[0030] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0031] Example 1:

[0032] As Figs. 1-4As shown, a bead structure 6 includes a steel wire bead 1, a bead wrap 5, a bead core wrap 2, a bead core rubber 3 and a body ply 4. The steel wire bead 1 has 5 layers of steel wires, and each layer has 5 steel wires. The bead wrap 5 is wrapped outside the steel wire bead 1, and the bead core wrap 2 is wrapped outside the bead wrap 5. The bead core rubber 3 is wrapped outside the bead core wrap 2, and the end of the bead core rubber 3 extends to the end of the bead core wrap 2 and covers the end of the bead core wrap 2. The body ply 4 is wrapped outside the bead core rubber 3. It is known to those skilled in the art that the radial inner side of the bead wrap 5 is also provided with a triangular rubber 13 in the embodiment, and the bead core wrap 2 wraps the bead wrap 5 and the triangular rubber 13. In the embodiment, the body ply 4 includes nylon cords, and the cords are externally coated with rubber, and the thickness of the rubber is usually 0.85mm-1mm. The bead structure 6 of the existing bias tire does not have the bead core rubber 3, that is, the body ply 4 is adjacent to the bead core wrap 2, and the body ply 4 is directly wrapped outside the bead core wrap 2. The tire needs to be vulcanized during the manufacturing process, and the rubber will flow during the vulcanization process to obtain the final tire product. The rubber coating in the body ply 4 is usually thin, and after vulcanization, the cord ends of the body ply 4 and the cord ends of the bead core wrap 2 in the bead part are close and dense, which is easy to cause damage to the bead part under the action of stress concentration. In the embodiment, the bead core rubber 3 is arranged between the bead core wrap 2 and the body ply 4, which can effectively isolate the ends of the bead core wrap 2 and the body ply 4, avoid stress concentration of the cord ends to cause damage to the bead part, and improve the speed performance and fatigue resistance of the tire during long-distance running.

[0033] The thickness of the bead core rubber 3 in the embodiment is not less than 1mm.

[0034] The end difference of the bead core wrap 2 in the embodiment is 5mm-10mm, which can be 8mm, and the end difference of the bead core rubber 3 is 4mm-8mm, which can be 6mm.

[0035] The bead wrap 5 in the embodiment is usually made of rubber and cords, and has good elasticity and adhesion. During the manufacturing process, the bead wrap 5 is tightly wrapped around the steel wire bead 1, and during the tire molding, shaping and vulcanization process, the bead wrap 5 can ensure that the steel wires do not loosen or deform, thereby ensuring the shape stability of the tire.

[0036] The width of the bead wrap 5 in the embodiment is 20±4mm, the width of the bead core wrap 2 is 55±6mm, and the width of the bead core rubber 3 is 60±6mm.

[0037] Embodiment 2:

[0038] As Figs. 1-4As shown, the embodiment provides a bias tire, which comprises the bead structure 6, the crown part 7 and the side part 8 in the embodiment 1, the bias tire is provided with the body ply 4 in the crown part 7, the side part 8 and the bead structure 6, and the body reinforcing layer 9 is further provided in the crown part 7.

[0039] The body reinforcing layer 9 is mainly used for improving the fatigue resistance of the tire, and avoiding the tire falling off due to the excessive centrifugal force when the tire rotates at high speed; the glue thickness of the body reinforcing layer 9 in the embodiment is 1.0mm-1.2mm.

[0040] The bias tire is further provided with the air tight layer 10, which is located at the innermost side in the radial direction of the bias tire. The main function of the air tight layer 10 is to prevent the compressed gas from leaking, and to maintain the air tightness of the tire. The thickness of the air tight layer 10 in the embodiment is 2.0mm-2.2mm.

[0041] As an embodiment, the cross section profile of the bias tire comprises a first circular arc segment, a second circular arc segment, a third circular arc segment, a fourth circular arc segment and a fifth circular arc segment, the first circular arc segment is located at the position of the crown part 7, the center of the first circular arc segment is located on the center line 11 of the tire cross section, the fourth circular arc segment is located at the side part 8 of the bias tire, the center of the fourth circular arc segment is located on the center horizontal axis 12 of the tire cross section (the center horizontal axis 12 is an axis line which can be determined by the person skilled in the art according to experience), the first circular arc segment is connected in a smooth transition manner through the second circular arc segment, the third circular arc segment and the fourth circular arc segment in sequence, the fourth circular arc segment is connected in a transition manner through the fifth circular arc segment and the profile of the bead structure 6, and the center of the fifth circular arc segment is located on the center horizontal axis 12 of the tire cross section. The embodiment optimizes the radius and the arc length of each circular arc segment, improves the bending stress at the shoulder part, makes the crown part 7 more flat, increases the ground contact area, reduces the ground stress, and improves the speed performance of the small size tire.

[0042] Taking the bias aviation tire with the specification of 330x130 as an example, the outer diameter of the bias aviation tire is 323±7mm, the cross section width is 127±5mm, the joint diameter is 98mm, and the joint width is 104mm. In the profile of the bias aviation tire, the radius R1 of the first circular arc segment is 115±10mm, and the arc length is 27±5mm; the radius R4 of the fourth circular arc segment is 60±5mm, and the arc length is 33±3mm; the radius of the second circular arc segment R2 is 60±5mm, and the arc length is 12±4mm; the radius R3 of the third circular arc segment is 25±5mm, and the arc length is 15±4mm; the radius R5 of the fifth circular arc segment is 143±5mm, and the arc length is 34±5mm.

[0043] The adaptive changes according to the actual requirements are all within the protection scope of the utility model.

[0044] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for the general technical personnel in the field, the specific implementation modes and application ranges will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A bead structure characterized in that, It comprises: a bead wire; a bead wire wrapping, which is wrapped outside the bead wire; a bead core wrapping, which is wrapped outside the bead wire wrapping; a bead core rubber sheet, which is wrapped outside the bead core wrapping, the end of the bead core rubber sheet extends to the end position of the bead core wrapping, and the end of the bead core rubber sheet covers the end of the bead core wrapping; and a body ply, which is wrapped outside the bead core rubber sheet.

2. The bead structure of claim 1 wherein, The end difference of the bead core wrapping is 5-10 mm, and the end difference of the bead core rubber sheet is 4-8 mm.

3. The bead structure of claim 1 wherein, The width of the bead wire wrapping is 20±4 mm, the width of the bead core wrapping is 55±6 mm, and the width of the bead core rubber sheet is 60±6 mm.

4. The bead structure of claim 1 wherein, The rubber thickness of the body ply is 0.85-1.0 mm.

5. A bias ply tire characterized by, The body ply is also distributed in the crown and the sidewall of the bias tire, the crown of the bias tire is also provided with a body reinforcing layer, and the body reinforcing layer is located outside the body ply.

6. The bias ply tire of claim 5, wherein, The rubber thickness of the body reinforcing layer is 1.0-1.2 mm.

7. The bias tire of claim 5 wherein, The bias tire further comprises an innermost air tight layer rubber in the radial direction.

8. The bias ply tire of claim 7, wherein, The thickness of the air tight layer rubber is 2.0-2.2 mm.

9. The bias ply tire of claim 7, wherein, The tire section contour of the bias tire comprises a first circular arc segment, a second circular arc segment, a third circular arc segment and a fourth circular arc segment, the first circular arc segment is located at the position of the crown, the center of the first circular arc segment is located on the center line of the tire section, the radius of the first circular arc segment is 115±10 mm, and the arc length is 27±5 mm; the fourth circular arc segment is located at the sidewall of the bias tire, the center of the fourth circular arc segment is located on the center horizontal axis of the tire section, the radius of the fourth circular arc segment is 60±5 mm, and the arc length is 33±3 mm; the first circular arc segment is connected in a smooth transition manner through the second circular arc segment, the third circular arc segment and the fourth circular arc segment in sequence, the radius of the second circular arc segment is 60±5 mm, and the arc length is 12±4 mm, the radius of the third circular arc segment is 25±5 mm, and the arc length is 15±4 mm.

10. The bias ply tire of claim 9, wherein, The fourth circular arc segment is connected in a transition manner with the outer contour of the bead structure through a fifth circular arc segment, the center of the fifth circular arc segment is located on the center horizontal axis of the tire section, the radius of the fifth circular arc segment is 143±5 mm, and the arc length is 34±5 mm.

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