CN112389136A

CN112389136A - Inner support body for tubeless pneumatic tire

Info

Publication number: CN112389136A
Application number: CN201910737679.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Li Daiyang
Current assignee: Li Daiyang
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2021-02-23

Abstract

The invention provides an inner tire support body which can upgrade a tubeless tire system into an explosion-proof safe tire system after being installed. The inner tire support body formed by combining the thin-wall support body blocks and the binding bands provides supporting force for a vehicle during tire burst or air shortage through close fit between the thin-wall support body blocks and with a rim, and has certain buffering performance and better riding comfort.

Description

Inner support body for tubeless pneumatic tire

Technical Field

The invention relates to an inner support body for a tubeless pneumatic tire, which can be mounted on a general or special rim for use, in particular to an inner support body for a tubeless pneumatic tire, which can play a role in safety protection after a tire is burst or leaked.

Background

The research of the safety tires was started by the company guchi in the beginning of the 20 th century, and the safety tires recognized internationally at present are divided into five major categories: multi-cavity type, self-sealing type, self-supporting type, internal supporting type and inflation-free type. The structure of the non-inflatable tire in the five types is different from that of the traditional tire in nature, and the other four types are all the standards of improving the existing tire structure or adding accessories to the existing tire structure to reach the safety tire.

The inner support type tire is one of the five types of safety tires which is most widely applied. The inner support body can be divided into two categories of flexible support and rigid support according to the material, wherein the flexible support body is processed by special flexible materials such as inflated rubber products or foaming materials, and the rigid support body is processed by light metal materials or engineering plastics mainly made of aluminum alloy. At present, flexible supports are not basically applied, and the inner supports are all referred to as rigid inner supports.

Internal support type run-flat tires are used in large numbers in military vehicles, police vehicles and special-purpose vehicles, where the internal support mainly benefits from its good performance: 1. the existence of the supporting body can not be felt when the tire is normally used; 2. the support body can ensure the safety of the vehicle in high-speed running and can run for a certain distance at a relatively high speed when the tire is decompressed.

Although the inner support body safety tire is the most widely used safety tire, the application range of the inner support body safety tire is still limited to special-purpose vehicles so far, and the inner support body safety tire is not widely used for civil vehicles, and the reason mainly comprises the following aspects: 1. the cost of the inner support body is high and even exceeds more than two times of the price of the tire; 2. the weight of the inner support body is large, and even approaches to that of a tire under individual conditions, so that the total weight of the vehicle is increased, and the fuel economy is reduced; 3. the inner support body is basically connected by steel bolts regardless of aluminum alloy or engineering plastic materials, so that the dynamic balance performance of the tire is greatly reduced; 4. the connection of the inner supporting body needs to consider that the inner supporting body is not loosened under the condition of long-time vibration, so the structure is complex and the disassembly and the assembly are troublesome; 5. in order to better ensure that the support body has the designed performance, a part of the inner support type tire needs a special rim to be installed; 6. the supporting performance of the inner supporting body is mainly considered during design, and the safety of the vehicle under the condition of tire burst or air shortage is ensured, so that the damping performance of the supporting body is poor, and the comfort of the vehicle is greatly reduced after air shortage. If the six problems are solved, the internal support type run-flat tire system is naturally popularized to the field of civil vehicles, and becomes a safety configuration not only for special-purpose vehicles but also a standard configuration of run-flat tires for civil vehicles.

The invention aims at solving the six problems so that the inner support type safety tire can not only be used in special fields, but also enter civil fields, the safety of highway traffic is improved, and traffic accidents and personal injuries caused by tire burst and other problems on a highway are reduced.

Disclosure of Invention

In order to solve the six problems, the invention adopts a new idea completely different from the design idea of the existing inner support body of the tire. The design idea of the existing inner support body is that the I-shaped support shape is taken as a main body, and lightening holes with the shapes of round or oval and the like are arranged, and the structure of the main body is increased, decreased and modified, so that the support body with a new function is formed; the existing support body adopts a bolt connection mode to ensure the connection stability. The novel idea of the invention is mainly derived from the thin-shell theory, the tire support body is designed by taking the characteristics of high strength and light weight of the thin-wall hyperboloid shell into consideration, and the optimal shape of the support body is considered on the basis of the main idea. As the support body in the tire must be arranged on the wheel rim, the thin shell structure has only two modes which are most reasonable: the first is to arrange a hollow circular ring or other thin shell structure parallel to the circumferential direction of the rim along the circumferential direction of the rim, the structure feels very simple when preliminarily considered, but the final design structure is much more complicated when the matching, the connection mode and the installation space of the structure and the rim are considered; the second method is to arrange a plurality of hollow circular rings or other thin shell structures which are parallel to the axial direction of the rim along the circumferential direction of the rim, and form a plurality of thin shell structures by means of mutual support of each hollow circular ring or other thin shell structures, thereby achieving the function of a support body. Based on the above analysis, the present invention gives priority to the second structural form.

After determining the basic structural form of the tire support body, the next design is to consider the assembly and disassembly of the tire support body on the wheel rim. If it is desired to use on a universal rim, the support body must be designed in a block-type configuration. The number and size of the segments depend on both the rim diameter and the size of the static radius under load of the tire, taking into account the support properties of the thin-walled structural object and the installation space. In view of the above, the blocking of the support body is also performed according to different tire classifications: for passenger car tires, it is preferable to divide the support body into 8-16 pieces, since the rim diameter is mostly between 15-17 inches and the aspect ratio of the section is between 50-70%; for truck and passenger car tires, it is better to divide the support body into 6-12 pieces because the diameter of the rim is mostly between 20-22.5 inches and the aspect ratio of the section is between 80-100%; the number of tire blocks for larger or special vehicles is determined according to the use condition. Because the number of the support body blocks is closely related to the specific shape of the thin shell structure, even a tire with a single specification can have different block numbers with different design schemes, and meanwhile, the tubeless pneumatic tire has various specifications and can only determine the number of the blocks with required specifications according to the design idea of the invention and different requirements.

The thickness of the thin shell structure of the support body is considered after the number of the blocks of the support body is determined, and the thickness of the thin shell structure is determined by considering not only the specific shape of the thin shell structure but also the maximum load of a single tire of the tire. The single-tire load is basically less than 1 ton for passenger tires, and is basically about 3 tons for truck tires. In addition to the above two considerations, the safety factor of the support body is also taken into account, and the combination of these factors can approximately calculate the thickness range of the thin shell structure, which is better between 3 mm and 7mm for passenger car tires and between 8 mm and 20mm for truck and passenger car tires, and the thickness of the larger or special vehicle tires is determined according to the use condition.

The method for determining the maximum width and the maximum height of the support body of the present invention is the same as the method for determining the width and the height of other support bodies at present, and the detailed description thereof is omitted. It should be noted that the maximum height of the support body in the present invention can be much larger than that of the existing support body, and in the limit, the maximum height can be approximately the same as the actual inner contour radius of the tire after the support body is installed. The maximum height of the support body according to the invention is generally determined as a value close to the difference between the radius of repose and the radius of the rim bottom under load of the tire.

The matching mode of the support body and the rim is relatively simple, and the matching surface of the support body and the rim only needs to be designed according to the section shape of the rim. Because the section shapes of the wheel rims with the same code are the same and have slight difference in specific width dimensions, the supporting bodies with the same matching mode can be used even for wheel rims with the same code (such as 6J and 6.5J) with similar dimensions.

The block, shape, and fitting of the support body to the rim should be determined by considering the connection mode. As a thin-wall support body with multiple blocks, the traditional bolt connection mode is obviously not applicable, and a new connection mode must be considered. The characteristics of the connection of the support body must be known in consideration of the connection mode of the support body: firstly, the connection can provide enough pretightening force to ensure that the supporting body cannot shift in the running process of the vehicle; secondly, the vehicle is ensured not to be loosened due to bumping in the driving process; thirdly, connection is to ensure that effective pretightening force is continuously provided in a tire replacement period; fourthly, the connection and disconnection mode is simple and easy to operate in a small space. According to the characteristics of the support body connection and the shape characteristics of the partitioned thin-wall support bodies, after analyzing various connection modes, the invention considers that the binding-belt type connection with self-locking is the most suitable connection mode: firstly, all the support bodies can be connected together in blocks before installation so as to be conveniently placed around a rim; when the second connection is fixed, the support body blocks can be fixed on the rim only by pulling the binding bands out of the connecting buckles for a certain length; thirdly, a check point (or a dead locking point) can be preset in advance to ensure that the pretightening force is continuously effective; fourthly, the material of the binding band meeting the strength requirement can be replaced along with the difference of the pretightening force requirement; fifthly, the binding band can be detached only by detaching or cutting off the binding band by using a proper tool. According to the analysis, the invention adopts the binding belt with the self-locking device to connect the support body blocks. Because the universal self-locking binding belt adopts different self-locking modes according to different materials, the stainless steel material suitable for the invention is generally in a self-locking mode of a self-locking head and a steel ball, and other flexible materials such as nylon and the like are generally in a self-locking mode of a square press buckle and a binding belt. According to the invention, the self-locking device is customized according to needs and the raised non-return points (the positions of the non-return points are different according to different pretightening forces required by different supporting bodies) are added on the stainless steel or nylon upper belt, so that the self-locking position is ensured not to be changed after long-time operation.

A final consideration in the construction of the present invention is the cooperation between the straps and the support blocks. Because the binding band has a certain width, the support body blocks need to obtain more uniform pretightening force, a right circular arc surface is required to be matched with the binding band, namely, each support body block is provided with a right circular arc surface with the same diameter for being matched with the binding band, and meanwhile, the right circular arc surface is provided with a limiting device for limiting the movement of the binding band along the width direction. The position of the right circular arc on the support segment is also a matter of consideration, firstly it needs to penetrate the whole segment in order to facilitate the passage of the strap, secondly it must have a suitable limiting hole, and the positions satisfying these two conditions are respectively located near the maximum and minimum diameter of the support segment. The present invention preferably selects the right circular arc surface and the stopper hole to be fitted with the binding band in the vicinity of the smallest diameter of the segments of the support body, considering that the smaller the centrifugal force generated by the support body at the time of high-speed running of the tire, the better. According to the analysis, the width of the binding band and the shape of the universal rim are considered at the same time, and the diameter of the right circular arc surface is the most reasonable when the minimum inner diameter of the supporting body is increased by 10-40 mm (the rim with a special shape is designed independently).

The design and preferred aspects of the present invention in its construction are described in detail above, and the materials of the support body segments and straps are described below. Because the invention mainly considers the structure of the supporting body, the material of the supporting body has various choices. Firstly, considering the material of the support block, the material can be known to meet the requirements of at least three aspects according to the use requirements of the support block: one is to have sufficient strength; secondly, certain elasticity is required; thirdly, certain toughness is required. Therefore, the support blocks can be made of the following materials: various metal materials such as steel and aluminum alloy; various polymer materials such as nylon, resin, engineering plastics, and the like; various composite materials such as glass fiber, carbon fiber and the like and other novel materials meeting the requirements. For the binding belt, because the weaving method of the binding belt has a great influence on the performance of the binding belt, the following performance is required in terms of the material of the binding belt: 1. the product has good dimensional stability; 2. has sufficient strength; 3. the anti-aging performance is excellent; 4 has excellent fatigue elongation resistance. The material that accords with above-mentioned requirement is similar with the support body piecemeal material, includes: metal materials such as stainless steel, polymer materials such as nylon, and composite materials such as carbon fiber.

The following describes a method of processing a support block of different materials. If a metal material such as aluminum alloy is used for the working, precision casting is the most preferable working method. Because the support body blocks are matched with the rim, all the support body blocks also need to be matched, the machining precision is relatively high, and precise casting must be selected for machining and manufacturing in order to meet the use requirement. If the polymer material such as engineering plastics is selected for processing, an injection molding method is required, and the production cost can be greatly reduced due to the advantages of high processing precision, high molding speed and the like of injection molding. If a novel composite material such as carbon fiber is selected for processing, as a novel material, new processing technology is continuously developed, so that the processing method of adopting a mould pressing method and a winding preforming method is more suitable for the production of the product, but the processing efficiency is low, the cost is high, some complex structures cannot be realized, and the processing method is only suitable for the development of some high-end products. According to the above analysis, the present invention preferably uses a polymer material such as engineering plastic and the like to perform the processing of the support block by injection.

The design idea and the preferred embodiments of the present invention are described in detail in the foregoing, and it can be understood from the description that the inner support body of the present invention has simple structure, light weight and convenient installation. The special rim is not required to be replaced, and the workload of assembling and disassembling the tire is not increased greatly; the dynamic balance performance of the tire is not influenced, and enough shock absorption performance can be provided; the supporting force required by the tire burst can be provided, and the long-distance continuous running capability required by the inner supporting body is also provided.

The invention can make the common tire of the common vehicle change into the run-flat tire with high safety through simple installation in a short time, in other words, the invention can be matched with various tire rim systems to form a safety tire system (or run-flat tire system).

Drawings

The invention is further illustrated with reference to the following figures and examples. (for clarity of illustration, the tires are not shown in the assembly diagram)

FIG. 1 is a schematic perspective view of an assembly of a support body and a rim in a tire according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a support body in a tire according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a support block according to an embodiment of the present invention;

FIG. 4 is a schematic perspective view of a support body in a second tire according to an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a second support block according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a three-support block according to an embodiment of the present invention;

in the figure, 1 the support body is divided into blocks, 11 the matching surface with the wheel rim, 12 the limiting hole, 13 the right circular arc surface, 2 the wheel rim and 3 the connecting binding band

Detailed Description

[ example 1 ]

An inner support body for a tire comprises a plurality of thin-wall fan-shaped cylindrical support body sub-blocks 1 with the same shape, wherein the thin-wall fan-shaped cylindrical support body sub-blocks 1 are closely arranged around a rim 2, the contact part of the support body sub-blocks 1 and the rim 2 is provided with a curved surface 11 matched with the rim, the part of the support body sub-blocks 1 close to the rim is provided with a limiting hole 12, a right circular ring surface 13 ensuring uniform force application of a binding band is arranged between the two limiting holes, and the support body sub-blocks 1 are pre-tightened and fixed on the rim through a connecting binding band 3 with a self-locking non-return device (or a locking.

[ example 2 ]

The difference between the present embodiment and embodiment 1 in terms of structure is that: as shown in fig. 5, the thin-walled support block 1 constituting the support is a combination of two cylinders and a cylinder-like object, and the two cylinders with the larger diameter of the support block and the cylinder-like object with the smaller diameter of the support block are combined together, in other words, the combination is an inseparable integral structure, and together form a support block.

In addition, the size of the support block described in the embodiment is much larger than that of the support block described in the embodiment 1, the structure of the embodiment 1 is relatively suitable for being used by a tire of a passenger car, and the structure of the embodiment is relatively suitable for being used by a tire of a truck or a larger vehicle. Because the supporting body used by the truck is higher in block height, the supporting failure caused by the fact that the single cylindrical structure can not reach the existing condition of the thin shell theory can be avoided by using the single cylindrical structure, and in order to avoid the supporting failure caused by insufficient supporting force of the single cylindrical structure, the combined structure can be adopted to effectively avoid the occurrence of the supporting failure condition. The two cylindrical structures selected in this embodiment are better combined structures because the thin-walled cylinder can transmit all the stress along the thin wall when stressed, and transmit the force to the cylinder-like object at the joint point of the lower cylinder-like structure, and the stress state is similar to that of embodiment 1. Of course, the processing of this structure was the same as in example 1, and accurate molding was possible by an injection processing method of a polymer material.

[ example 3 ]

The difference between the present embodiment and embodiment 2 in terms of structure is that: as shown in fig. 6, the thin-walled support block 1 constituting the support is a combination of three cylindrical-like objects of different shapes. This embodiment is a larger contact area of the support body in contact with the tire than embodiment 2, and can provide a larger frictional force.

The above description is only three embodiments of the present invention, and the embodiment 2 is taken as an illustration, and the structure of the larger diameter portion of the combined structure may be selected from three or more cylindrical or cylinder-like structures with the same or different sizes, and the structure of the smaller diameter portion may be the same as or modified as the embodiment 2. The embodiments are merely illustrative of the principles and features of the present invention and their advantages, rather than restrictive, in all respects. Various changes and modifications of the above embodiments may be made by those skilled in the art without departing from the spirit of the present invention and the scope of the appended claims.

Claims

1. An inner support body for a tubeless pneumatic tire comprises a plurality of support body blocks (1) and binding bands (3), and is characterized in that the support body blocks (1) are of a single thin-wall structure or a combined thin-wall structure, and the support body blocks are pre-tightened and fixed on a rim (2) through the binding bands (3).

2. An internal support according to claim 1, characterized in that each support segment (1) can be a single thin-walled cylinder-like structure or a combination of one thin-walled cylinder-like structure and several thin-walled cylinder-like structures or thin-walled cylinder-like structures.

3. An inner support according to claim 1, characterized in that the support segments (1) have a curved surface (11) which matches the shape of the rim (2).

4. An internal support according to claim 1, characterised in that the support segments (1) have a right circular arc (13) to engage the straps (3) to ensure uniform stress.

5. An internal support according to claim 1, wherein the support segments (1) have limiting holes (12) to secure the position of the strap (3).

6. An inner support according to claim 1, characterized in that each support segment (1) is a tight fit in the circumferential direction of the rim after mounting.

7. Internal support according to claim 1, characterized in that said tie (3) has self-locking and non-return means, the position of which is related to the magnitude of the pre-tightening force.

8. An internal support body according to claim 1, wherein the support body blocks (1) and the binding bands (3) can be made of engineering plastics, metals, carbon fibers, novel composite materials and the like.