A run-flat tire

Abstract

The utility model provides a kind of free inflating tire, it relates to tire technical field.It includes wheel hub;Sleeve joint setting at the outside of wheel hub and tire body, tire body is annular and inner ring opening, tire body is closely matched with wheel hub and with the outer end surface of wheel hub forms airtight cavity;Several uniform filling settings are hollow sphere in airtight cavity inside, hollow sphere mutually abuts and the hollow sphere at edge and the inner wall of airtight cavity abut;Hollow sphere surface is smooth and is coated with lubricant;Hollow sphere is made of one or more of ultrahigh molecular weight polyethylene, high molecular weight polyethylene, polypropylene, polytetrafluoroethylene, nylon.Due to filler being hollow sphere, it is not necessary to inflate, thus from filling medium form aspect solves the problem that existing tire needs to be often supplemented or released gas, and sharp object pierces into tire, hollow sphere is not easy to be punctured, and will not cause influence to tire pressure.

Description

Technical Field

[0001] This utility model relates to the field of tire technology, and in particular to a tire that does not require inflation. Background Technology

[0002] Car tires are one of the most important components of a car. They come into direct contact with the road surface and, together with the car's suspension, work to mitigate the impacts the car experiences while driving, ensuring good ride comfort and smooth driving, maintaining good adhesion between the wheels and the road surface, improving the car's traction, braking, and handling, and bearing the weight of the car.

[0003] Current car tires are typically pneumatic tires, which use compressed air to inflate elastic bladders to cushion vibrations and impacts during movement. However, these pneumatic tires have the following drawbacks: (a) Because the gas inside the tire expands and contracts with temperature changes, and the gas inside the tire is easy to escape, it is necessary to monitor the tire pressure according to the temperature. If the temperature drops and the gas escapes, the tire pressure will be too low, and a certain amount of gas needs to be added. If the temperature rises and the tire pressure is too high, a certain amount of gas needs to be released. Frequently adding or releasing air into the tire is cumbersome. (b) If a sharp object punctures the tire, it will cause compressed gas to leak, the tire pressure inside the tire will drop sharply, and the gas will continue to leak. Once the tire pressure is lower than the minimum tire pressure required to support the vehicle body, it will be unable to provide effective support for the vehicle body. At this time, the tire must be replaced or repaired. (c) Repairing or replacing a punctured tire would result in a sharp increase in costs.

[0004] To address the aforementioned deficiencies, a ball-and-bead module airless tire is disclosed in utility model patent CN216101356U. The technical solution includes an outer bladder with an annular structure. The inner ring of the outer bladder is fitted to the rim. The inner cavity of the outer bladder is hollow. Several first partition layers are radially spaced within the inner cavity of the outer bladder. Several second partition layers are spaced between adjacent first partition layers from the inner ring to the outer ring. The second partition layers divide adjacent first partition layers into several ball-and-bead filling cavities, which are filled with inflatable rubber balls and rubber beads.

[0005] Although this patent does not require direct inflation of the tire, the rubber balls and beads inside the tire are still inflated, meaning that the problem of frequently replenishing or releasing a certain amount of gas inside the tire still exists, as mentioned in defect (a). If a sharp object punctures the tire, it will still puncture a certain number of rubber balls and beads inside the tire, causing a decrease in the density of the rubber balls and beads supporting the tire, i.e., a decrease in tire pressure. As the car continues to drive, the sharp object continues to penetrate deeper into the tire, the number of punctured rubber balls and beads continues to increase, and the density of the rubber balls and beads supporting the tire continues to decrease, i.e., a continuous decrease in tire pressure. When the tire pressure drops below the lower limit required to support the vehicle body, it cannot provide effective support for the vehicle body, meaning that the problems caused by the decrease in tire pressure due to the puncture of sharp objects, as mentioned in defects (b) and (c), still exist.

[0006] In addition, the patent has the following problems: the tire is not elastic enough, the impact force is rapidly attenuated when it is transmitted from the bottom filler upwards and is absorbed by the filler, the transmission distance is very short, the tire feels very hard, and therefore it cannot be driven at high speeds.

[0007] Therefore, the patent does not actually solve the defects (a), (b) and (c) in the prior art. That is, the problems in the prior art are still not solved, and new problems have been created. Utility Model Content

[0008] The purpose of this utility model is to provide a pneumatic tire to solve the technical problems existing in the prior art. The preferred technical solutions among the various technical solutions provided by this utility model and the numerous technical effects they produce are detailed below.

[0009] To achieve the above objectives, the present invention provides the following technical solution: A pneumatic tire, comprising: Wheel hub; A tire body is fitted onto the outside of the wheel hub. The tire body is annular with an inner opening. The tire body fits tightly with the wheel hub and forms a sealed cavity with the outer end face of the wheel hub. A plurality of hollow spheres are uniformly filled inside the sealed cavity, the hollow spheres abutting against each other and the edges of the hollow spheres abutting against the inner wall of the sealed cavity; The hollow sphere has a smooth surface and is coated with a lubricant. The hollow sphere is made of one or more of ultra-high molecular weight polyethylene, high molecular weight polyethylene, polypropylene, polytetrafluoroethylene, and nylon.

[0010] Preferably, the ratio of the diameter of the hollow sphere to the outer diameter of the tire body is between 1:1000 and 1:8.

[0011] Preferably, the wall thickness of the hollow sphere is in the range of 0.001-3 mm.

[0012] Preferably, the relationship between the elastic modulus E, radius r, wall thickness t of the hollow sphere and the maximum design tire pressure p of the tire body is: E≥pr / 2t.

[0013] Preferably, the outer wall of the hollow sphere is porous.

[0014] Preferably, the hollow sphere is filled with a lightweight filler.

[0015] Preferably, the lubricant is talc or lubricating oil.

[0016] The beneficial effects of this utility model are as follows: 1. By filling the tire with hollow spheres that can only undergo slight deformation, when the tire deforms and the tire pressure increases due to external conditions such as uneven road surfaces, the additional tire pressure can be instantly transmitted to the stacked hollow spheres. The hollow spheres deform to generate a higher packing density, and sometimes even local depressions are formed at the contact points to reduce the volume of the spheres. At the same time, due to the extremely small friction between the hollow spheres, the hollow spheres move freely in the tire cavity, and the increased stress is quickly distributed throughout the tire cavity.

[0017] 2. When the tire pressure is restored, the hollow sphere can quickly rebound and recover. The deformation of the tire and the change in tire pressure are borne by the filled sphere and transmitted to the other adjacent spheres in an instant, thus achieving balance.

[0018] 3. The filler is a hollow sphere, which does not require inflation. Therefore, the problem of existing tires needing to be frequently replenished or released from air is solved in terms of the form of the filling medium.

[0019] 4. The low coefficient of friction on the surface of the spheres results in low friction between them, allowing the hollow spheres to move freely within the tire body, thus ensuring the fluidity and balance of all the hollow spheres within the tire body.

[0020] 5. The sphere is made of high-strength plastic. When a sharp object punctures the tire, the hollow sphere is not easily punctured and will not affect the tire pressure.

[0021] 6. Dense pores are formed on the outer wall of each hollow sphere, and each hollow sphere is filled with a lightweight filler, which further improves the lightweight nature of the hollow sphere. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 for Figure 1 Detailed structural diagram at point A; 1. Wheel hub in the picture; 2. Fetus; 3. Hollow sphere. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Reference Figures 1 to 2 This utility model provides a pneumatic tire, comprising: Wheel hub 1; The tire body 2 is sleeved on the outside of the wheel hub 1. The tire body 2 is annular with an inner opening. The tire body 2 fits tightly with the wheel hub 1 and forms a sealed cavity with the outer end face of the wheel hub 1. Several hollow spheres 3 are uniformly filled inside a sealed cavity, with the hollow spheres 3 abutting against each other and the hollow spheres 3 at their edges abutting against the inner wall of the sealed cavity. The hollow sphere 3 has a smooth surface and is coated with a lubricant. Hollow sphere 3 is made of one or more of ultra-high molecular weight polyethylene, high molecular weight polyethylene, polypropylene, polytetrafluoroethylene, and nylon.

[0027] By filling the tire with hollow spheres 3 that can only undergo slight deformation, when the tire deforms and increases tire pressure due to external conditions such as uneven road surfaces, the additional tire pressure is immediately transmitted to the stacked hollow spheres 3. The hollow spheres 3 deform to generate a higher packing density, and sometimes even produce local depressions at the contact points to reduce the volume of the spheres, or are quickly transmitted to the entire inner cavity of the tire through the sliding between the hollow spheres 3.

[0028] When the tire pressure is restored, the hollow sphere 3 quickly rebounds and recovers. The deformation of the tire and the change in tire pressure are borne by the filled sphere and transmitted to the other adjacent spheres in an instant, thus achieving balance.

[0029] Since the filler is a hollow sphere 3, it does not require inflation, thus solving the problem of existing tires needing to frequently replenish or release gas in terms of the form of the filling medium.

[0030] The hollow sphere 3 has a very low coefficient of friction due to its material, and with the addition of lubricant, the friction between them is very small, allowing the hollow sphere 3 to move freely within the tire body, thus ensuring the fluidity and mobility of all the hollow spheres 3 within the tire body.

[0031] The hollow sphere 3 is made of high-strength plastic. When a sharp object punctures the tire, the hollow sphere 3 is not easily punctured and will not affect the tire pressure.

[0032] As an optional implementation, the ratio of the diameter of the hollow sphere 3 to the outer diameter of the body 2 is between 1:1000 and 1:8.

[0033] If the hollow sphere 3 is too large, it cannot fill the tire body 2. If the hollow sphere 3 is too small, it may leak from the inner ring of the tire body 2 where it meets the wheel hub 1. Therefore, the above range can achieve the best effect.

[0034] As an alternative implementation, the wall thickness of the hollow sphere 3 ranges from 0.001 to 3 mm.

[0035] The combination of wall thickness and tire pressure must result in only 2% deformation under normal tire pressure; therefore, the above range achieves optimal results.

[0036] As an optional implementation, the relationship between the elastic modulus E, radius r, wall thickness t of the hollow sphere 3 and the maximum design tire pressure p of the tire body 2 is: E≥pr / 2t.

[0037] Through the above relationship, the sphere will not undergo irreversible deformation under the maximum design impact force of the tire, thus ensuring the service life of the airless tire.

[0038] As an optional implementation, the outer wall of the hollow sphere 3 is porous, and the interior of the hollow sphere 3 is filled with a lightweight filler, thereby further improving the lightweight nature of the hollow sphere 3.

[0039] As an alternative implementation, the lubricant is talc or lubricating oil, which improves the fluidity of all the hollow spheres 3 inside the tire body 2.

[0040] The filling method of the hollow sphere 3 of the airless tire of this utility model is as follows: After the tire body 2 is placed on the rim 1, the rim 1 is fixed on the tire balancer. A rigid tube with a bottom cut is inserted into the gap between the tire and the rim 1 until the bottom of the rigid tube is completely inside the tire body 2. The hollow sphere 3 is poured in from the other end of the rigid tube through a funnel. Pressure is used to press the hollow sphere 3 into the tire body 2 until the required tire pressure is reached. During the process, the rim 1 can be paused and rotated, and the tire body 2 can be tapped from the outside to ensure that the hollow sphere 3 completely fills the tire body 2.

[0041] The working principle of this utility model of a pneumatic tire is as follows: the tire is filled with hollow spheres 3 that can only undergo slight deformation. When the tire deforms and the tire pressure increases due to external conditions such as uneven road surfaces, the additional tire pressure is immediately transmitted to the stacked hollow spheres 3. The hollow spheres 3 deform to generate a higher packing density, and sometimes even produce local depressions at the contact points, reducing the volume of the spheres. At the same time, due to the extremely small friction between the hollow spheres 3, the hollow spheres 3 move freely in the tire cavity, and the increased stress is quickly dispersed throughout the tire cavity. When the tire pressure is restored, the hollow spheres 3 quickly rebound and recover. The deformation of the tire and the change in tire pressure are borne by the filled spheres and immediately transmitted to the other adjacent spheres, thus achieving balance.

[0042] In summary, this invention utilizes hollow spheres 3, which can only undergo minute deformation, to fill the tire. When the tire deforms and its pressure increases due to external conditions such as uneven road surfaces, the resulting additional tire pressure is immediately transmitted to the stacked hollow spheres 3. The hollow spheres 3 deform to generate a higher packing density, and sometimes even produce local depressions at the contact points, reducing the volume of the spheres. At the same time, due to the extremely small friction between the hollow spheres 3, they move freely within the tire cavity, and the increased stress is quickly dispersed throughout the tire cavity. When the tire pressure returns to normal, the hollow spheres 3 quickly rebound and recover. The deformation of the tire and the change in tire pressure are borne by the filled spheres and immediately transmitted to the other adjacent spheres, thus achieving balance.

[0043] Since the filler is a hollow sphere 3, it does not require inflation, thus solving the problem of existing tires needing to frequently replenish or release gas in terms of the form of the filling medium.

[0044] The hollow sphere 3 has a low coefficient of friction on its surface and low friction between them, allowing it to move freely within the entire tire body 2, thus ensuring the fluidity and balance of all the hollow spheres 3 within the tire body 2.

[0045] The hollow sphere 3 is made of high-strength plastic. When a sharp object punctures the tire, the hollow sphere 3 is not easily punctured and will not affect the tire pressure.

[0046] The outer wall of each hollow sphere 3 is porous, and the interior of each hollow sphere 3 is filled with a lightweight filler, which further improves the lightweight nature of the hollow sphere 3.

[0047] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0048] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pneumatic tire, characterized in that, include: Wheel hub (1); A tire body (2) is sleeved on the outside of the hub (1). The tire body (2) is annular with an inner opening. The tire body (2) fits tightly with the hub (1) and forms a sealed cavity with the outer end face of the hub (1). A number of hollow spheres (3) are uniformly filled inside the sealed cavity, the hollow spheres (3) abut against each other and the edges of the hollow spheres (3) abut against the inner wall of the sealed cavity; The hollow sphere (3) has a smooth surface and is coated with a lubricant; The hollow sphere (3) is made of one or more of ultra-high molecular weight polyethylene, high molecular weight polyethylene, polypropylene, polytetrafluoroethylene, and nylon.

2. The pneumatic tire according to claim 1, characterized in that, The ratio of the diameter of the hollow sphere (3) to the outer diameter of the body (2) is between 1:1000 and 1:

8.

3. The pneumatic tire according to claim 2, characterized in that, The wall thickness of the hollow sphere (3) ranges from 0.001 to 3 mm.

4. The pneumatic tire according to claim 3, characterized in that, The relationship between the elastic modulus E, radius r, wall thickness t of the hollow sphere (3) and the maximum design tire pressure p of the tire body (2) is: E≥pr / 2t.

5. The pneumatic tire according to claim 1, characterized in that, The outer wall of the hollow sphere (3) is porous.

6. The pneumatic tire according to claim 1, characterized in that, The hollow sphere (3) is filled with a lightweight filler.

7. The pneumatic tire according to claim 1, characterized in that, The lubricant is talc or lubricating oil.

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