N+2 cavity mechanical bionic buffer air cavity hollow tire and preparation method thereof

Abstract

The invention relates to the technical field of tires, and discloses an n + 2 cavity mechanical bionic buffer air cavity hollow tire and a preparation method thereof.The structure of the n + 2 cavity mechanical bionic buffer air cavity hollow tire comprises a tire body and buffer air cavities, the buffer air cavities penetrate through the tire body in the axial direction, the cross sectional areas of the buffer air cavities in the axial direction are kept consistent, and the n buffer air cavities comprise two constant-number buffer air cavities and n variable-number buffer air cavities of mechanical bionic patterns, the hollow tire has the advantages of being light in weight, high in bearing capacity, good in buffering performance and the like, high in heat dissipation efficiency and capable of prolonging the service life of the tire, and the hollow tire is independently and evenly distributed on the tire body at intervals to form a constant mechanical relation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tire technology, in particular to an n+2 cavity mechanical bionic buffer air cavity hollow tire and a preparation method thereof. BACKGROUND

[0002] With the rapid development of shared bicycles and shared electric vehicles, the market's requirements for vehicle durability and maintenance costs are increasing, and non-pneumatic tires are therefore receiving increasing attention. One of the core challenges faced by shared bicycle and shared electric vehicle operations is high tire maintenance costs. Although pneumatic tires have the advantages of light weight, small rolling resistance, good cushioning performance, etc. At the same time, they also have fatal shortcomings such as easy air leakage, easy tire burst, not resistant to puncture, frequent maintenance requirements, etc. The main advantage of non-pneumatic tires is that they do not need to be inflated, and only use the tire's own materials and structure to achieve support and cushioning performance, with the advantages of not being afraid of being punctured, good elasticity, wear resistance, small rolling resistance, etc. The service life is more than 3 times that of pneumatic tires, and is becoming an important development direction of the industry. It is estimated that in the next five years, the demand for non-pneumatic tires in the shared travel field will grow at an average annual rate of more than 15%. However, non-pneumatic tires are generally not as good as pneumatic tires in terms of shock absorption and comfort. In particular, in the field of shared electric vehicles, the vehicle weight and speed are higher, and the reliability and safety of non-pneumatic tires are also subject to stricter requirements.

[0003] To ensure load-bearing performance, existing non-pneumatic tires often use denser support structures, resulting in increased weight, and cushioning is mainly dependent on material deformation. At high speeds or on bumpy roads, the cushioning effect is not as good as that of pneumatic tires, affecting vehicle range and riding experience. For example, solid tires are not accepted by the market due to their poor comfort, heavy weight, and durability; using a sponge foamed inner tire body is relatively soft, so it deforms a lot during use, generates a lot of heat, and the heat at the center of the inner tire body is not easily dissipated, which can exceed the material's temperature limit due to heat accumulation, causing the molecular chain to break and the tire to be damaged. Hollow tires have different internal structures, and the thickness, shape, hardness, etc. of the materials in each part have a great impact on tire performance. For example, when the thickness is thin, comfort is improved, but load capacity is reduced; when the hardness is increased, load capacity is increased, but comfort is reduced, and it is also prone to cracking. Therefore, the number and size of the internal structures need to be set through comprehensive evaluation of various aspects, such as tire and rim specifications, customer requirements for tire size, etc. to invent a product that meets customer needs.

[0004] A Y-shaped support structure maintenance-free hollow tire and its preparation method are disclosed in Chinese invention patent (publication number: 120439713A, publication date: 2025-08-08). A Y-shaped support structure maintenance-free hollow tire is prepared, which includes an outer contour, an inner hole, a support structure, an air inlet hole, and a vent hole. The support structure is located between the inner holes, the air inlet hole is arranged at the top of the hollow tire and communicates with the inner holes, and the vent hole is arranged inside the support structure between the inner holes. By adjusting the size and position of each part of the hollow tire internal cavity structure during preparation, both good comfort and high tire body strength can be maintained.

[0005] Mechanical bionics is an important branch of bionics, which draws inspiration from biology, studies the relationship between the macro / micro structure of living organisms and their mechanical properties, and applies these mechanical principles to the design and innovation of engineering structures. It is not just a simulation of shape, but also a deep reference to the efficient and energy-saving mechanical principles of biological systems, aiming to solve engineering problems such as "how to achieve optimal mechanical properties with the least amount of material". In the design of multi-cavity hollow tires, bionic patterns can provide direct geometric models for design, guiding the design of tire body internal structures with light weight, high load capacity, and good cushioning performance. The Reuleaux triangle has a triangular main frame with three corners that are smoothly transitioned. It is a closed curve formed by drawing arcs with the vertices of the equilateral triangle as the center and the side length as the radius, combining the stability of the triangle and the smoothness of the circle. The culvert arch can generate horizontal thrust under vertical load, thereby achieving the downward and outward dispersion of pressure, showing good mechanical load-bearing performance. The semispherical surface and longitudinal lines of the chestnut shell form a typical thin shell structure that can evenly distribute external pressure to the entire surface, avoiding local stress concentration. This uniform curvature achieves the "soft overcomes hard" load-bearing effect through geometric curvature.

[0006] A non-inflatable hollow structure has been designed and developed, which can not only highly simulate the elasticity and strength performance of inflatable tires, but also form an effective mechanical dispersion system to reduce tire load and stress concentration during use, providing users with good driving comfort while extending the service life of the tire. It has become a top priority in the field of non-inflatable tires. SUMMARY

[0007] The present application provides an n+2 cavity mechanical bionic buffer air cavity hollow tire and its preparation method to overcome the shortcomings of the prior art. By adjusting the number, position, and size of the mechanical bionic buffer air cavity inside the hollow tire, it can maintain high mechanical load-bearing performance and good cushioning comfort.

[0008] To achieve the above purpose, the technical scheme adopted by the present application is:

[0009] The application provides an n+2 cavity mechanical biomimetic buffer air cavity hollow tire, comprising: a tire body and a buffer air cavity. The buffer air cavity penetrates through the tire body along the axial direction, and the cross-sectional area along the axial direction remains consistent. The n+2 cavity buffer air cavity comprises two constant number buffer air cavities and n variable number buffer air cavities, which are independently and uniformly distributed in the tire body. The tire body has a certain wall thickness between the outer contour and the buffer air cavity to provide support, and the stable support body is formed between all the buffer air cavities, so that the tire force is better transmitted to the rim, and the mechanical load bearing performance is maintained at a high level.

[0010] Further preferably, the constant number buffer air cavities comprise buffer air cavity A and buffer air cavity B.

[0011] Further preferably, the variable number buffer air cavities comprise buffer air cavity 1, buffer air cavity 2, and buffer air cavity n, 0

[0012] Further preferably, the cross section of the buffer air cavity A along the tire axial direction is a reversed culvert arch shape, comprising an elliptical arc top wall and an arch bottom wall, and the elliptical arc top wall and the arch bottom wall are connected by two vertical side walls.

[0013] Further preferably, the cross section of the buffer air cavity B along the tire axial direction is a positive straight edge similar to a Rollox triangle, comprising a left triangular edge side wall, a right triangular edge side wall, and a triangular edge bottom wall, and the left triangular edge side wall, the right triangular edge side wall, and the triangular edge bottom wall are connected by transition arc walls, respectively.

[0014] Further preferably, the cross sections of the buffer air cavities 1 to n along the tire axial direction are all non-vertical chestnut shell biomimetic patterns with equal sizes, respectively comprising short arc side walls and long arc side walls, and the short arc side wall and the long arc side wall of the same buffer air cavity are connected by two hemispherical walls.

[0015] Further preferably, the buffer air cavity A and the buffer air cavity B are arranged vertically along the center line of the tire axial cross section and are left-right symmetrical, and are uniformly distributed on the upper and lower sides of the horizontal center line of the tire axial cross section. The distance between the bottom of the arch bottom wall of the buffer air cavity A and the center of the tire axial cross section is equal to the distance between the top of the transition arc wall of the buffer air cavity B and the center of the tire axial cross section.

[0016] Further preferably, the number and position of the buffer air cavities 1 to n are uniformly distributed in the tire body between the buffer air cavity A and the buffer air cavity B, and are symmetrically arranged along the horizontal center line of the tire axial cross section and are left-right symmetrical on the left and right sides of the vertical center line of the tire axial cross section. The buffer air cavities 1 to n are symmetrically arranged along the straight line formed by the center of the tire axial cross section and the center of each buffer air cavity, respectively.

[0017] Further preferably, a represents the total width of the hollow tire, b represents the total height of the hollow tire cross section, c represents the width of the hollow tire and the rim engagement position, the specific values of a, b, c are set according to the tire, rim specifications, customer requirements for tire size, etc. The total width a of the hollow tire described in the present application is 60-100 mm, the total height b of the cross section is 50-100 mm, and the engagement position width c is 50-80 mm.

[0018] Further preferably, H1 is the distance from the top of the hollow tire engagement position to the top of the elliptical arc top wall of the buffer gas cavity A, H1 = 5-20% a· (2^(n / 2)-1) / 2^(n / 2-1), H2 is the distance from the center of the hollow tire axial cross section to the bottom of the arched bottom wall of the buffer gas cavity A, H2 = 5-15% a· (2^(n / 2)-1) / 2^(n / 2-1), H3 is the distance from the outer contour of the hollow tire to the adjacent vertical side wall of the buffer gas cavity A, H3 = 15-40% a· (2^(n / 2)-1) / 2^(n / 2-1), D1 is the corresponding chord length of the elliptical arc top wall of the buffer gas cavity A, D1 = 15-30% a / 2^(n / 2-1), R1 is the radius value of the elliptical arc top wall of the buffer gas cavity A, R1 = 6-20% a / 2^(n / 2-1), R2 is the radius value of the arched bottom wall of the buffer gas cavity A, R2 = 3-15% a / 2^(n / 2-1).

[0019] Further preferably, H4 is the distance from the crown top of the hollow tire to the triangular side bottom wall of the buffer gas cavity B, H4 = 10-25% a· (2^(n / 2)-1) / 2^(n / 2-1), D2 is the length value of the left triangular side wall, right triangular side wall, and triangular bottom wall of the buffer gas cavity B, D2 = 15-30% a / 2^(n / 2-1), R3 is the radius value of the transition arc wall of the buffer gas cavity B, R3 = 15-30% a / 2^(n / 2-1).

[0020] Further preferably, H5 is the distance from the hollow tire outer contour to the top of the long-arc sidewall of the adjacent buffer air cavity 1 to buffer air cavity n, H5 = 5-20% a· (2^(n / 2)-1) / 2^(n / 2-1), H6 is the distance from the hollow tire axial cross-section center to the top of the short-arc sidewall of the adjacent buffer air cavity 1 to buffer air cavity n, H6 = 5-15% a· (2^(n / 2)-1) / 2^(n / 2-1), and H6 = H2, D3 is the corresponding chord length of the long-arc sidewall of the buffer air cavity 1 to buffer air cavity n, D3 = 15-30% a / 2^(n / 2-1), and D1:D3 = 0.5-3:1, D2:D3 = 0.5-6:1, R4 is the radius value of the short-arc sidewall of the buffer air cavity 1 to buffer air cavity n, R4 = 2-15% a / 2^(n / 2-1), R5 is the radius value of the long-arc sidewall of the buffer air cavity 1 to buffer air cavity n, R5 = 8-25% a / 2^(n / 2-1), and R6 is the radius value of the hemispherical wall of the buffer air cavity 1 to buffer air cavity n, R6 = 10-30% a / 2^(n / 2-1).

[0021] Further preferably, H7 is the support thickness in the tire circumferential direction between the adjacent buffer air cavity A, buffer air cavity 1 to buffer air cavity n, and buffer air cavity B, H7 = 10-20% a.

[0022] Further preferably, the tire body is provided with blocks and grooves.

[0023] The application also provides a preparation method of an n+2 cavity mechanical bionic buffer air cavity hollow tire, comprising the following steps:

[0024] 1) Extrusion molding: extruding the rubber compound through an extruder to obtain a long strip-shaped semi-finished tire tube;

[0025] 2) Cutting: cutting the long strip-shaped semi-finished tire tube obtained in step 1) according to the set length;

[0026] 3) Butt joint: butt jointing the long strip-shaped semi-finished tire tube after cutting to form a ring-shaped semi-finished product through a hot joint machine under pressure;

[0027] 4) Vulcanization: placing the ring-shaped semi-finished product into a mold cavity to obtain a hollow tire.

[0028] Compared with the prior art, the application has the following beneficial effects:

[0029] The present application provides an n+2 cavity mechanical bionic buffer air cavity hollow tire, which combines the concept of mechanical bionics, uses the smoothness of the Luoluo triangle, which has the stability of a triangle and the smoothness of a round transition angle, the uniform dispersion of pressure by the culvert arch and the chestnut shell bionic pattern, and the characteristics of avoiding local stress concentration to construct a multi-cavity buffer air cavity tire body structure with light weight, strong bearing capacity and good buffer performance. The multi-cavity buffer air cavity has a special shape and arrangement, forms a support system with constant mechanical relationship, makes the hollow tire have reliable elasticity and buffer performance; at the same time, the heat conduction area is larger, the heat dissipation efficiency is higher, which can effectively reduce the risk of temperature accumulation in the tire, avoid the local overheating problem that may occur during long-time high-speed driving, and greatly prolong the service life of the tire. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is an n+2 cavity mechanical bionic buffer air cavity hollow tire structure diagram of the present application.

[0031] Figure 2 It is an n+2 cavity mechanical bionic buffer air cavity hollow tire structure diagram of the present application corresponding to each parameter.

[0032] Figure 3 It is a solid tire structure diagram of the prior art of comparative example 1.

[0033] Figure 4 It is a four-cavity mechanical bionic buffer air cavity hollow tire structure diagram of example 1.

[0034] Figure 5 It is a six-cavity mechanical bionic buffer air cavity hollow tire structure diagram of example 2.

[0035] Figure 6 It is an eight-cavity mechanical bionic buffer air cavity hollow tire structure diagram of example 3.

[0036] In the figure: (1) is the tire body, (2) is the buffer air cavity A, (21) is the elliptical arc top wall, (22) is the arch-shaped bottom wall, (23) is the vertical side wall, (3) is the buffer air cavity B, (31) is the left triangular side wall, (32) is the right triangular side wall, (33) is the triangular bottom wall, (34) is the transition arc wall, (4) is the buffer air cavity n, (41) is the short arc side wall, (42) is the long arc side wall, and (43) is the semispherical wall. DETAILED DESCRIPTION

[0037] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0038] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] Comparative Example 1: As shown in Figure 3 , a commercially available solid tire of the same specification.

[0040] Examples 1-3

[0041] The present application provides an n+2 cavity mechanical biomimetic buffer gas cavity hollow tire, as shown in Figure 1 , comprising: a tire body (1) and a buffer gas cavity. The buffer gas cavity penetrates the tire body (1) in the axial direction, and the cross-sectional area in the axial direction remains consistent. The n+2 cavity buffer gas cavity includes 2 constant number buffer gas cavities and n variable number buffer gas cavities, each independently and uniformly spaced on the tire body (1). There is a certain wall thickness between the outer contour of the tire body (1) and the buffer gas cavity to provide support, and a stable support body is formed between all buffer gas cavities, so that the tire force is better transmitted to the rim, maintaining high mechanical load bearing performance.

[0042] Further preferably, the constant number buffer gas cavities include buffer gas cavity A (2) and buffer gas cavity B (3).

[0043] Further preferably, the variable number buffer gas cavities include buffer gas cavity 1, buffer gas cavity 2, and buffer gas cavity n (4), 0

[0044] Further preferably, the cross section of the buffer gas cavity A (2) in the tire axial direction is a reversed culvert arch shape, including an elliptical arc top wall (21) and an arch bottom wall (22), and the elliptical arc top wall (21) and the arch bottom wall (22) are connected by two vertical side walls (23).

[0045] Further preferably, the cross section of the buffer gas cavity B (3) in the tire axial direction is a positive straight edge similar to a Rulux triangle, including a left triangular edge side wall (31), a right triangular edge side wall (32), and a triangular edge bottom wall (33), and the left triangular edge side wall (31), the right triangular edge side wall (32), and the triangular edge bottom wall (33) are connected by a transition arc wall (34), respectively.

[0046] Further preferably, the buffer air chambers 1 to n (4) are arranged in the tire axial cross section vertically along the center line and symmetrically left and right, and are uniformly distributed on the left and right sides of the tire axial cross section vertical center line and symmetrically left and right. The buffer air chambers 1 to n (4) are symmetric along the straight line formed by the tire axial cross section center and the respective buffer air chamber center.

[0047] Further preferably, the buffer air chambers A (2) and B (3) are arranged in the tire axial cross section vertically along the center line and symmetrically left and right, and are uniformly distributed on the upper and lower sides of the tire axial cross section horizontal center line. The distance from the bottom of the arched bottom wall (22) of the buffer air chamber A (2) to the center of the tire axial cross section is equal to the distance from the top of the transition arc-shaped wall (34) of the buffer air chamber B (3) to the center of the tire axial cross section.

[0048] Further preferably, the number and position of the buffer air chambers 1 to n (4) are uniformly distributed between the buffer air chambers A (2) and B (3) in the tire body (1), symmetrically along the tire axial cross section horizontal center line, and uniformly distributed on the left and right sides of the tire axial cross section vertical center line and symmetrically left and right. The buffer air chambers 1 to n (4) are symmetric along the straight line formed by the tire axial cross section center and the respective buffer air chamber center.

[0049] Further preferably, a represents the total width of the hollow tire, b represents the total height of the hollow tire cross section, and c represents the width of the hollow tire and the rim at the engagement position. The specific values of a, b and c are set according to the tire and rim specifications, customer requirements for tire size, etc. The total width a of the hollow tire according to the present application is 60-100 mm, the total height b of the cross section is 50-100 mm, and the width c at the engagement position is 50-80 mm.

[0050] In Examples 1-3, the total width a of the hollow tire is 80 mm, the total height b of the cross section is 78 mm, and the width c at the engagement position is 60 mm.

[0051] As shown in Figure 2 , Figures 4-6 With the change of the value of n, the parameters of the hollow tire in Examples 1-3 of the present application are shown in Table 1.

[0052] Table 1 (units: mm, except n)

[0053] At the same time of testing and verification, the outer tire and the rim are assembled, except that the hollow tire structure size changes, the rim and the outer tire remain the same during testing and verification.

[0054] Hollow tire preparation:

[0055] 1) Extrusion molding: the rubber compound is extruded through an extruder with inner and outer dies to obtain long strip-shaped semi-finished tire tubes;

[0056] 2) Cutting: the long strip-shaped semi-finished tire tubes obtained in step 1) are cut according to the set length;

[0057] 3) Butt joint: the cut long strip-shaped semi-finished tire tubes are butt jointed by a hot joint machine under pressure to form a ring-shaped semi-finished product;

[0058] 4) Vulcanization: the ring-shaped semi-finished product is placed in a mold cavity to obtain a hollow tire.

[0059] Performance test:

[0060] Test conditions: in combination with GB / T 31549-2015 "Electric Bicycle Tire Performance Test Method", the tire endurance test mileage is set to be over 10,000 km without damage.

[0061] Main experimental equipment: tire high-speed endurance test machine GXYS-054, Shantou Haoda tire test equipment Co., Ltd.

[0062] The test results are shown in Table 2 below

[0063] Table 2 (unit: km)

[0064] According to Table 2, the comparative example 1 is a solid tire of the prior art on the market, which has a large weight, although it has strong load capacity, but has poor cushioning performance, can only rely on the performance of the carcass compound, generates a large amount of heat, has low heat conduction efficiency, and is easy to cause tire damage. In examples 1-3, as the value of n increases, although the number of cushioning air chambers increases, the size gradually decreases, the thickness of the tire wall and the support body increases, the support strength is enhanced, but the cushioning performance decreases, the carcass stress is locally concentrated, the heat dissipation is poor, and the carcass is easy to be damaged. At the same time, as the weight of the carcass increases, the riding comfort is reduced.

[0065] The above describes the embodiments of the present application, through the above description of the disclosed embodiments, the person skilled in the art can realize or use the present application. Various modifications of these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hollow tire with an n+2 cavity biomimetic buffer air cavity, comprising: The tire body (1) and the buffer air chamber are characterized in that the buffer air chamber penetrates the tire body (1) along the axial direction and the cross-sectional area along the axial direction is consistent. The n+2 buffer air chamber includes two fixed-number buffer air chambers and n variable-number buffer air chambers, which are independently and evenly distributed in the tire body (1). There is a certain wall thickness between the outer contour of the tire body (1) and the buffer air chamber to play a supporting role. A stable support body is formed between all the buffer air chambers.

2. The hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, characterized in that, The constant number of buffer air chambers includes buffer air chamber A (2) and buffer air chamber B (3).

3. The hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, characterized in that, The variable number of buffer air chambers includes buffer air chamber 1, buffer air chamber 2, up to buffer air chamber n (4), where 0 < n ≤ 10, and n is an even natural number.

4. The hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, characterized in that, The cross-section of the buffer air chamber A (2) along the tire axis is an inverted culvert arch, including an elliptical top wall (21) and an arched bottom wall (22), which are connected by two vertical side walls (23).

5. The hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, characterized in that, The cross-section of the buffer air chamber B (3) along the tire axis is a straight side similar to a Lurox triangle, including a left triangular side wall (31), a right triangular side wall (32) and a triangular bottom wall (33). The left triangular side wall (31), the right triangular side wall (32) and the triangular bottom wall (33) are connected by transition arc walls (34).

6. The hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, characterized in that, The cross-sections of the buffer air chambers 1 to n (4) along the tire axis are all non-perpendicular chestnut shell biomimetic patterns and are of equal size, each including a short arc sidewall and a long arc sidewall. The short arc sidewall (41) and the long arc sidewall (42) of the same buffer air chamber are connected by two hemispherical walls (43).

7. A hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, 4, or 5, characterized in that, The buffer air chambers A (2) and B (3) are arranged vertically and symmetrically along the vertical center line of the tire axial cross-section, and are evenly distributed on the upper and lower sides of the horizontal center line of the tire axial cross-section. The distance between the bottom of the arched bottom wall (22) of the buffer air chamber A (2) and the center of the tire axial cross-section is equal to the distance between the top of the transition arc wall (34) of the buffer air chamber B (3) and the center of the tire axial cross-section.

8. A hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1 or 6, characterized in that, The number and position of the buffer air chambers 1 to n (4) are evenly distributed in the tire body (1) between the buffer air chambers A (2) and B (3), symmetrically distributed vertically along the horizontal center line of the tire axial cross-section, and evenly distributed on the left and right sides of the vertical center line of the tire axial cross-section, and symmetrically distributed horizontally. The buffer air chambers 1 to n (4) are symmetrical along the straight line formed by the center of the tire axial cross-section and the center of their respective buffer air chambers.

9. The hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, characterized in that, The total width a of the hollow tire is 60-100mm, the total cross-sectional height b of the hollow tire is 50-100mm, and the width c of the contact point between the hollow tire and the rim is 50-80mm.

10. A hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, 4, or 9, characterized in that, The distance H1 from the top of the hollow tire's engagement position to the top of the elliptical arc top wall (21) of the buffer air cavity A (2) is 5-20%a·(2^(n / 2)-1) / 2^(n / 2-1), the distance H2 from the center of the hollow tire's axial cross-section to the bottom of the arched bottom wall (22) of the buffer air cavity A (2) is 5-15%a·(2^(n / 2)-1) / 2^(n / 2-1), and the distance from the outer contour of the hollow tire to the vertical sidewall (23) of the adjacent buffer air cavity A (2) is... The distance H3 = 15-40%a·(2^(n / 2)-1) / 2^(n / 2-1), the chord length D1 of the elliptical arc top wall (21) of the buffer air cavity A (2) is 15-30%a / 2^(n / 2-1), the radius value R1 of the elliptical arc top wall (21) of the buffer air cavity A (2) is 6-20%a / 2^(n / 2-1), and the radius value R2 of the arched bottom wall (22) of the buffer air cavity A (2) is 3-15%a / 2^(n / 2-1).

11. A hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, 5, or 9, characterized in that, The distance H4 from the top of the crown of the hollow tire to the bottom wall (33) of the triangular side of the buffer air cavity B (3) is 10-25%a·(2^(n / 2)-1) / 2^(n / 2-1), the length D2 of the left triangular side wall (31), right triangular side wall (32), and bottom wall (33) of the buffer air cavity B (3) is 15-30%a / 2^(n / 2-1), and the radius R3 of the transition arc wall (34) of the buffer air cavity B (3) is 15-30%a / 2^(n / 2-1).

12. A hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1, 6, or 9, characterized in that, The distance H5 from the outer contour of the hollow tire to the top of the long arc sidewall (42) of the adjacent buffer air chamber 1 up to the buffer air chamber n (4) is 5-20%a·(2^(n / 2)-1) / 2^(n / 2-1), the distance H6 from the center of the axial cross section of the hollow tire to the top of the short arc sidewall (41) of the adjacent buffer air chamber 1 up to the buffer air chamber n (4) is 5-15%a·(2^(n / 2)-1) / 2^(n / 2-1), and H6=H2, the chord length D3 corresponding to the long arc sidewall (42) of the buffer air chamber 1 up to the buffer air chamber n (4) is 15- 30%a / 2^(n / 2-1), and D1:D3=0.5-3:1, D2:D3=0.5-6:1, the radius value R4 of the short arc sidewall (41) of the buffer air chamber 1 to the buffer air chamber n (4) is 2-15%a / 2^(n / 2-1), the radius value R5 of the long arc sidewall (42) of the buffer air chamber 1 to the buffer air chamber n (4) is 8-25%a / 2^(n / 2-1), and the radius value R6 of the hemispherical wall (43) of the buffer air chamber 1 to the buffer air chamber n (4) is 10-30%a / 2^(n / 2-1).

13. A hollow tire with an n+2 cavity biomimetic buffer air cavity according to claim 1 or 9, characterized in that, The thickness of the support body in the tire circumferential direction between each pair of the adjacent buffer air chambers A (2), buffer air chamber 1 up to buffer air chamber n (4), and buffer air chamber B (3) is H7 = 10-20%a.

14. A hollow tire with an n+2 cavity biomimetic buffer air cavity according to any one of claims 1-13, characterized in that, The tire body (1) is provided with pattern blocks and pattern grooves.

15. A method for preparing an empty tire in an n+2 cavity biomimetic buffer air cavity, comprising the following steps: 1) Extrusion molding: The compounded rubber is extruded through an extruder with an inner die and an outer die to obtain a long strip of semi-finished tire tube; 2) Cutting: Cut the long strip of semi-finished tire tube obtained in step 1) to the set length; 3) Butt joint: The cut long strip semi-finished tire tubes are pressure-jointed together using a heat joint machine to form a ring-shaped semi-finished product; 4) Vulcanization: The annular semi-finished product is placed into the mold cavity to obtain a hollow tire.

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