CN113147265A

CN113147265A - Non-pneumatic tire with gradually-changed elasticity and manufacturing method thereof

Info

Publication number: CN113147265A
Application number: CN202110513537.8A
Authority: CN
Inventors: 徐婷; 许高; 张不扬
Original assignee: Ji Hua Laboratory
Current assignee: Ji Hua Laboratory
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-07-23
Anticipated expiration: 2041-05-11
Also published as: CN113147265B

Abstract

The application discloses elasticity gradual change non-pneumatic tire and manufacturing method thereof, including: the wheel comprises a hub, an inner buffer layer, a support structure, an outer buffer layer, a filling material and a belt and tread composite layer; the inner surface of the inner buffer layer is fixedly connected with the outer surface of the hub; the supporting structure is arranged between the inner buffer layer and the outer buffer layer and is formed by spirally interweaving or weaving shape memory alloy with memory property; the supporting structure comprises a plurality of fixing strips and annular supporting pieces; one end of the fixing strip is fixedly connected with the inner buffer layer, and the other end of the fixing strip can be fixedly connected with the annular support piece or the outer buffer layer; the annular supporting piece is fixedly connected with the fixing strip; the filler is positioned in a hollow area formed by combining the supporting structure and the inner and outer buffer layers, and the filler is fixedly connected with the inner surface of the hollow area; the belt and tread composite layer is arranged on the outer side of the outer buffer layer, and the outer surface of the outer buffer layer is fixedly connected with the inner surface of the belt and tread composite layer. Through structural design and material selection, the bearing, heat dissipation and vibration reduction performance of the non-pneumatic tire is improved.

Description

Non-pneumatic tire with gradually-changed elasticity and manufacturing method thereof

Technical Field

The present application relates to the field of tires, and more particularly, to a non-pneumatic tire with a gradual change in elasticity and a method for manufacturing the same.

Background

The conventional pneumatic tire supports a vehicle body using air pressure as a medium, and has excellent stretching, bending and impact-resistant cushion properties. But when punctured by an external sharp object or otherwise damaged, cannot maintain the original pressure state by itself, so that the tire loses the support function. At the same time, the resulting deterioration of the vehicle handling performance and braking performance will also likely result in a greater safety hazard. Based on this, non-pneumatic tires (non-pneumatic tires), i.e., airless tires (airless tires), which can avoid safety accidents caused by air pressure loss or tire burst (flat tire) during the driving process of a vehicle by using a design mode of replacing the action of tire pressure with an elastic filler or a support body are introduced in the market.

The prior non-pneumatic tire has the following defects: firstly, a solid non-pneumatic tire is usually a single-material product, and is outstanding in bearing and vibration reduction; secondly, the solid non-pneumatic tire is made of polyurethane materials mostly, so that heat is easy to generate, and no method for enhancing heat dissipation exists at present, so that the overall heat dissipation effect of the tire is poor; the tyre body is thick and solid, the heat conduction performance is poor, and the accumulated heat is easy to cause the strength reduction of the tyre body material. And fourthly, the design of the holes on the tire not only improves the heat radiation performance of the tire slightly, but also reduces the load carrying capacity of the tire. In addition, the aging of the tire body is accelerated by keeping the temperature at a high level for a long time, so that the solid tire is damaged by glue falling, degumming and the like. In view of this, how to improve the vibration damping performance and the thermal stability performance of the non-pneumatic tire so as to ensure the safety of the vehicle is a key problem to be solved urgently in the market.

Disclosure of Invention

The application aims to provide a non-pneumatic tire with gradually changed elasticity and a manufacturing method thereof, which improve the bearing capacity and the thermal stability of the non-pneumatic tire and improve the overall heat radiation performance and the vibration reduction characteristic of the tire.

To achieve the above object, the present application discloses a non-pneumatic tire with gradually changed elasticity, comprising: the wheel comprises a hub, an inner buffer layer, a support structure, an outer buffer layer, a filling material and a belt and tread composite layer; the inner surface of the inner buffer layer is fixedly connected with the outer surface of the non-pneumatic tire hub; the supporting structure is arranged between the inner buffer layer and the outer buffer layer and is formed by spirally interweaving or weaving shape memory alloy with memory characteristics, and specifically can be one or more of nickel-titanium series, copper-nickel series, copper-aluminum series, copper-zinc series and iron series shape memory alloy; one end of the fixing strip is fixedly connected with the inner buffer layer, and the other end of the fixing strip can be fixedly connected with the annular support piece or the outer buffer layer; the annular supporting piece is fixedly connected with the fixing strip; the filler is positioned in a hollow-out area formed by combining the supporting structure and the inner and outer buffer layers, and the filler is fixedly connected with the inner surface of the hollow-out area; the belt and tread composite layer is arranged on the outer side of the outer buffer layer, and the outer surface of the outer buffer layer is fixedly connected with the inner surface of the belt and tread composite layer.

Optionally, the number of the annular supporting pieces in the radial direction is N₁Not less than 0, when N₁When 0, the annular support member is absent; when N is present₁1 or more, i.e. said toroidal support is present concentrically to the non-pneumatic tyre and uniformly or non-uniformly distributed along the radial direction of the tyre.

Optionally, the support structure is formed from a helical interweaving or braiding of fibres or other material; wherein the winding direction of the fiber or other materials and the generatrix of the support structure form an included angle within the range of +/-30 degrees to +/-60 degrees; the fibers or other materials include carbon fibers, polyester fibers, glass fibers, nylon, cotton, rayon, steel wire, and the like;

optionally, the fixing strips and the annular supporting member are combined with the inner and outer buffer layers to form a plurality of hollow areas for accommodating fillers, wherein the fillers have gradient density; namely gradually decreases or gradually increases from inside to outside along the radial direction of the tire, and the density range of the filler is 240-690kg/m³；

Optionally, the hollow-out areas include a first hollow-out area and a second hollow-out area; the first hollow-out area is positioned between the inner buffer layer and the annular support piece, and the second hollow-out area is positioned between the annular support piece and the outer buffer layer; the fillers in the first hollow-out area and the second hollow-out area are the same or different.

Optionally, the filler is elastic soft microporous foam plastic, and specifically can be formed by one or more of polyurethane, resin and rubber;

preferably, the filling material is elastic soft microporous foam plastic and is a polyurethane material;

optionally, the filler has micropores, and the size and the number of the micropores of the filler are changed in a gradient manner. That is, it is gradually increased or decreased from the inside to the outside in the tire radial direction;

optionally, the fixing strips include a first fixing strip and a second fixing strip, and the first fixing strip connects the inner buffer layer and the annular support member; the second fixing strip penetrates through the annular supporting piece and is connected with the inner buffer layer, the annular supporting piece and the outer buffer layer; the number of the first fixing strips between two adjacent second fixing strips is N₂Not less than 0, when N₂When 0, the first fixing strip is not present; when N is present₂And when the value is more than or equal to 1, the first fixing strip exists.

Optionally, the fixing strip is in a straight line or a curved line, wherein the curved line includes any single radius or variable radius arc line; the fixing strips are uniformly distributed at intervals along the circumferential direction of the tire and are radially arranged from the inner buffer layer to the fixing strips or the outer buffer layer along the tire;

preferably, the fixing strip is a fibonacci spiral;

as another embodiment of the present application, there is also disclosed a method of manufacturing a non-pneumatic tire with a gradual change in elasticity, comprising the steps of:

the inner buffer layer and the outer buffer layer are molded by injection molding or casting of polyurethane materials and are made into a mold core with a supporting structure shape;

spirally interweaving or weaving fibers or other materials on a mold core in the shape of a support structure;

fixedly connecting the inner buffer layer and the outer buffer layer with a mold core in the shape of a support structure;

heating and melting the mold core in the shape of the support structure, and discharging the mold core from the gaps of the spirally interwoven or woven composite material;

integrally placing the fixedly connected support structure, the inner buffer layer and the outer buffer layer into a mold, and injecting a filler to the plurality of hollowed-out areas according to requirements, wherein the filler is injected by a Structural Reaction Injection Molding (SRIM) process or a rotary Injection process;

bonding the belt and tread composite layer on the outer side of the outer buffer layer;

and carrying out vulcanization treatment to obtain the non-pneumatic tire with gradually changed elasticity.

The composite supporting structure comprises the fixing strips and the annular supporting pieces, a plurality of hollowed-out areas are divided in the non-pneumatic tire, fillers with the radial filling density, the size of the micropores and the quantity gradient change along the tire are filled in the hollowed-out areas, the supporting structure can be formed by spirally interweaving or weaving fibers or other materials, the integral bearing capacity and the thermal stability of the tire are guaranteed, and meanwhile the heat dissipation performance and the vibration reduction performance of the non-pneumatic tire are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor. In the drawings:

FIG. 1 is a schematic structural view of a non-pneumatic tire having a gradual change in elasticity according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of another embodiment of a non-pneumatic tire having a gradual change in elasticity;

FIG. 3 is a schematic structural view of a support structure of a non-pneumatic tire having a gradual change in elasticity according to an embodiment of the present disclosure;

FIG. 4 is an enlarged view of the portion A of FIG. 3;

FIG. 5 is a schematic illustration of the weave direction and angles of a support structure of a non-pneumatic tire having a gradient elasticity in accordance with an embodiment of the present application;

FIG. 6 is an exploded view of a non-pneumatic tire having a gradual change in elasticity according to an embodiment of the present application;

FIG. 7 is a flowchart illustrating steps in a method of manufacturing a non-pneumatic tire having a gradient elasticity in accordance with an embodiment of the present disclosure;

wherein, 100, non-pneumatic tire with gradual change of elasticity; 110. a belt tread composite layer; 120. a hub; 130. an inner buffer layer; 140. an outer buffer layer; 200. a support structure; 210. an annular support member; 220. a fixing strip; 221. a first fixing strip; 222. a second fixing strip; 230. a hollow-out area; 231. a first hollowed-out area; 232. a second hollowed-out area; 240. a bus direction; 250. fibers or other materials.

Detailed Description

Specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments of the present application. This application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, it is to be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The application is further described with reference to the drawings and alternative embodiments.

As shown in fig. 1 to 3, the present application discloses a non-pneumatic tire 100 with gradual change in elasticity, comprising: a belt and tread composite layer 110 for contacting a road surface and tightening a tire; a hub 120 located inside the non-pneumatic tire; an inner cushion layer 130 adjacent to the hub 120 and an outer cushion layer 140 adjacent to the belt and tread composite layer 110; a support structure 200 disposed between inner cushion layer 130 and outer cushion layer 140 for supporting loaded non-pneumatic tire 100; the inner surface of the inner buffer layer is fixedly connected with the outer surface of the non-pneumatic tire hub; the support structure 200 comprises a ring-shaped support 210 and fixing strips 220 arranged at intervals along the ring-shaped support 210; the annular support member is radially providedNumber N₁Not less than 0, when N₁When 0, i.e. the annular support is not present; when N is present₁When the tire pressure is more than or equal to 1, namely the annular support exists, is concentric with the non-pneumatic tire and is uniformly or non-uniformly distributed along the radial direction of the tire; one end of the fixing strip is fixedly connected with the inner buffer layer, and the other end of the fixing strip can be fixedly connected with the annular support piece or the outer buffer layer, so that a plurality of hollow areas 230 for containing fillers are divided and distributed at intervals along the circumferential direction of the tire; the filling material is fixedly connected with the inner surface of the hollow-out area.

The fixing strip is in a straight line or a curve shape, wherein the curve shape comprises any arc line with a single radius or a variable radius; the fixing strips are uniformly distributed at intervals along the circumferential direction of the tire and are radially arranged along the tire from the inner buffer layer to the annular support piece or the outer buffer layer.

Preferably, the fixing strip 220 has a fibonacci spiral structure in the non-pneumatic tire 100, and numerical studies have found that: the Fibonacci spiral line structure can better improve the buffer vibration reduction and grounding performance of the non-pneumatic tire.

In an optional embodiment, the fixing strip 220 includes a first fixing strip 221 and a second fixing strip 222, where the first fixing strip 221 connects the inner buffer layer 130 and the annular support 210; the second fixing strips 222 penetrate through the annular supporting member 210 to connect the inner buffer layer 130, the annular supporting member 210 and the outer buffer layer 140, and the number of the first fixing strips between two adjacent second fixing strips 222 is N₂Not less than 0, when N₂When 0, the first fixing strip is not present; when N is present₂And when the value is more than or equal to 1, namely the first fixing strip exists, as shown in the figures 3 to 4. The first fixing strip 221 and the second fixing strip 222 take any point as an origin to form a Fibonacci spiral line between the inner buffer layer 130 and the outer buffer layer 140, the Fibonacci spiral line is used for dividing the hollow areas 230 with different areas, the hollow areas are uniformly distributed at intervals along the circumferential direction of the tire, the supporting structure 200 with the hollow areas 230 with different areas enables the stress of the non-pneumatic tire to be dispersed onto a plurality of spokes, the distribution of the ground contact footprint of the non-pneumatic tire is enabled to be more uniform, a lower stress level is shown on the whole, and the bearing capacity is improved.

In an alternative embodiment, the hollow-out regions 230 include a plurality of first hollow-out regions 231 between the inner buffer layer 130 and the annular support member 210, which are relatively dense; the second hollow-out areas 232 between the annular support member 210 and the outer cushion layer 140 are relatively sparse, so that the structure is relatively not easy to gather heat, and the heat of the tire can be well dispersed. The area of the first hollow-out area 231 is smaller than that of the second hollow-out area 232, and the number of the hollow-out areas for containing the filler is relatively large. The hollow areas 230 that so divide are simple in structure, and the wholeness is strong, and for other a plurality of openings or hollow areas 230 that form through the mesh, only have two different hollow areas 230 of area, will make things convenient for the control to the stopping quantity more, and effectively reduce the tire dead weight when guaranteeing bearing capacity, save material.

The support structure 200 is formed from a spiral braid or weave of fibers or other material. Wherein the winding direction of the fiber or other materials and the generatrix of the support structure form an included angle within the range of +/-30 degrees to +/-60 degrees; the fibers or other materials include carbon fibers, polyester fibers, glass fibers, nylon, cotton, rayon, steel wire, and the like.

Preferably, as shown in fig. 5, the support structure 200 is made by spirally interweaving or weaving non-adjacent carbon fiber materials, and the winding direction between the carbon fiber materials 250 forms an angle of ± 45 degrees with a generatrix of the woven body.

The spirally interwoven or woven carbon fiber material has the advantages of light overall structure, high compression resistance, tensile strength, ultrahigh specific strength, high heat conductivity and the like when being applied to the tire relative to other materials, meanwhile, as the filler is foam plastic formed by soft polyurethane, the filler has good interface adhesion and is often used as a carbon fiber material surface modified coating, and gaps exist among the spirally interwoven or woven carbon fiber materials, when the filler made of the polyurethane material is poured, the polyurethane can pass through the gaps among the carbon fiber materials to form a fiber composite material with higher interface bonding performance with a support body of the carbon fiber material, the buffer performance is better, and the integrity is firmer.

In an optional embodiment of the present invention, the support structure is formed by spirally interweaving or weaving shape memory alloys with memory characteristics, and may specifically be formed by one or more of nickel-titanium system, copper-nickel system, copper-aluminum system, copper-zinc system, and iron system shape memory alloys.

The shape memory alloy has shape memory effect, can be deformed at lower temperature, and can restore the shape before deformation after heating. Meanwhile, the metal has super-elastic property, namely, under the action of external force, the shape memory alloy has much larger deformation recovery capability than that of common metal, namely, large strain generated in the loading process can be recovered along with unloading. The shape memory alloy is applied to a support structure of a non-pneumatic tire, and the super-elastic characteristic of the alloy can be utilized to effectively improve the buffering and vibration damping capacity of the non-pneumatic tire, so that the non-pneumatic tire cannot generate permanent deformation when dealing with impact load; secondly, the shape of the supporting structure under a certain temperature condition can be preset by utilizing the shape memory effect of the alloy, and when the non-pneumatic tire runs at a high speed, the heat generated in the tire promotes the deformation of the supporting structure to restore to the preset shape, so that the bearing performance of the supporting structure is effectively improved.

The filling material adopted in the embodiment of the application is foam plastic, comprises one or more of polyurethane, resin or rubber, and has a microporous structure; the density, the size and the number of the micropores of the filler vary in a gradient manner, i.e. gradually increasing or decreasing from the inside to the outside in the radial direction of the tire.

In an alternative embodiment, the first hollow-out area 231 near the hub 120 is a bearing area, and high-density foam plastic with relatively small elasticity and relatively small number of micropores is selected as a filling material to be injected; the second hollow-out area 232 close to the belt and tread composite layer 110 is a buffer area, and high-resilience flexible foam plastic with relatively small density, relatively large number of micropores and relatively large elasticity is selected as filling material to be injected, namely, the density of the filling material is gradually reduced from the inner buffer layer to the outer buffer layer along the radial direction of the tire, and the number of the micropores is gradually increased from the inner buffer layer to the outer buffer layer along the radial direction of the tire. The non-pneumatic tire has higher elasticity and compression composite ratio, the buffering and vibration damping performance of the tire is improved, and the uniformity of grounding stress is ensured, so that the comfort and the controllability of a vehicle are indirectly improved. In addition, the filler with higher elasticity and the supporting structure 200 act together to reduce the hysteresis loss of the tire, reduce the heat generation of the non-pneumatic tire, and reduce the plastic fatigue aging, so that the tire not only can bear higher load, but also can meet the normal use of the vehicle under the high-speed running condition.

Preferably, the filler is polyurethane foam, and in order to ensure that the filler in the hollow area 230 has excellent physical properties, higher tensile strength, tear strength and wear resistance, the density of the polyurethane foam is determined to be 240-690kg/m³。

Optionally, in the axial direction of the tire, the fixing strip and the annular support member formed by the spirally interwoven or woven composite material are not covered by the filler at both ends of the tire, that is, are exposed to the air. Firstly, the fixing strips and the annular supporting pieces have good heat conducting performance compared with fillers, and secondly, the fixing strips and the annular supporting pieces can exhaust air and suck air in the process of carrying, compressing and deforming of the non-pneumatic tire so as to improve the heat radiation performance of the non-pneumatic tire.

As another embodiment of the present application, there is also disclosed a method of manufacturing a non-pneumatic tire with a gradual change in elasticity, as shown in fig. 7, including the steps of:

s1, performing injection molding or casting molding on the inner buffer layer and the outer buffer layer by using a polyurethane material, and manufacturing a mold core with a supporting structure shape;

s2, spirally interweaving or weaving fibers or other materials on a mold core in the shape of the supporting structure;

s3, fixedly connecting the inner buffer layer and the outer buffer layer with a mold core in the shape of a support structure;

s4, heating and melting the mold core in the shape of the support structure, and discharging the mold core from the gaps of the spirally interwoven or woven composite material;

s5, integrally placing the fixedly connected supporting structure, the inner buffer layer and the outer buffer layer into a mold, and injecting a filling material to the plurality of hollowed-out areas according to requirements, wherein the filling material is injected through a Structural Reaction Injection Molding (SRIM) process or a rotary Injection process;

s6, bonding the belt tread composite layer on the outer side of the outer buffer layer;

and S7, carrying out vulcanization treatment to obtain the non-pneumatic tire with gradually changed elasticity.

The non-pneumatic tire manufacturing method comprises the steps of firstly, carrying out Injection molding or casting molding on the inner buffer layer 130 and the outer buffer layer 140 through polyurethane materials, then manufacturing a mold core with a supporting structure shape, spirally interweaving or weaving fibers or other materials 250 on the mold core with the supporting structure 200 shape, wherein the mold core can be made of wax or other low-melting point materials, the inner side and the outer side of the supporting structure 200 which is spirally interweaved or woven by the fibers or other materials are respectively and fixedly connected with the inner buffer layer 130 and the outer buffer layer 140, then heating and melting the mold core with the supporting structure shape to discharge the mold core from gaps of the spirally interweaved or woven composite materials, then integrally placing the fixedly connected supporting structure 200, the inner buffer layer 130 and the outer buffer layer 140 into a mold, utilizing soft type microporous polyurethane foam fillers as required, carrying out the process through SRIM (structural Injection molding), structural reaction injection molding) or a rotational injection method, injecting the mixture into a hollow-out area 230 formed by the support structure 200 and the inner and outer cushion layers for molding, then bonding a belt and tread composite layer on the outer side of the outer cushion layer, and finally performing vulcanization treatment to obtain the non-pneumatic tire with gradually changed elasticity. In this scheme, adopt the micropore polyurethane elastomer injection moulding of density gradual change, rather than directly punching, polyurethane foam fills in the fretwork district that forms between the supporter, and the thermal conductivity of supporter is superior to polyurethane far away, makes the holistic heat resistance of tire and heat-sinking capability all obtain improving.

In the scheme, the density of the polyurethane filler can be controlled by controlling the using amount of the external foaming agent, and the common external foaming agent comprises dichloromethane and fluorotrichloromethane. The most desirable external blowing agent is fluorotrichloromethane, which removes the heat of reaction during vaporization, typically in an amount of 5% to 15%. For environmental protection, HFC-141B or HFC-145fa can be used for substitution; besides, the forming of the fillers with different densities can be controlled by selecting proper stirring speed, stirring time, whitening time, foaming time and release agent, and the commonly used release agents comprise high-melting-point microcrystalline wax solution, aqueous emulsion, polyethylene dispersion and the like.

According to the application, the supporting structure 200 of the non-pneumatic tire is made of a spiral interweaved or woven composite material, and the annular supporting piece 210 and the fixing strip 220 are arranged regularly to divide a plurality of hollow areas so as to disperse the bearing load of the non-pneumatic tire; meanwhile, the fillers with different densities are filled in different hollowed-out areas, so that the layered design of the elasticity of the tire is realized, the bearing capacity of the non-pneumatic tire is ensured, and the buffering and vibration damping performance of the non-pneumatic tire is enhanced.

It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application. The various shapes and numbers of the definitions referred to in this scheme are not to be considered as limiting without affecting the implementation of the specific embodiment. The technical scheme of the application can be widely applied to the ground-rolling annular elastic rubber products assembled on various vehicles or machines.

The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the present application is not intended to be limited to the specific embodiments shown. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims

1. A progressive elasticity non-pneumatic tire comprising: the wheel comprises a hub, an inner buffer layer, a support structure, an outer buffer layer, a filling material and a belt and tread composite layer;

the inner surface of the inner buffer layer is fixedly connected with the outer surface of the non-pneumatic tire hub;

the supporting structure is arranged between the inner buffer layer and the outer buffer layer, comprises a plurality of fixing strips and annular supporting pieces, is formed by spirally interweaving or weaving shape memory alloy with memory property, and can be specifically one or more of nickel-titanium system, copper-nickel system, copper-aluminum system, copper-zinc system and iron system shape memory alloy;

one end of the fixing strip is fixedly connected with the inner buffer layer, and the other end of the fixing strip can be fixedly connected with the annular support piece or the outer buffer layer; the annular supporting piece is fixedly connected with the fixing strip;

the filler is positioned in a hollow-out area formed by combining the supporting structure and the inner and outer buffer layers, and the filler is fixedly connected with the inner surface of the hollow-out area;

the belt and tread composite layer is arranged on the outer side of the outer buffer layer, and the outer surface of the outer buffer layer is fixedly connected with the inner surface of the belt and tread composite layer.

2. A resiliently progressive non-pneumatic tire as in claim 1, wherein said support structure is formed from a spiral interweaving or braiding of fibers or other materials; wherein the winding direction of the fiber or other materials and the generatrix of the support structure form an included angle within the range of +/-30 degrees to +/-60 degrees; the fibers or other materials include carbon fibers, polyester fibers, glass fibers, nylon, cotton, rayon, steel wire, and the like.

3. A resiliently progressive non-pneumatic tyre as claimed in claim 1, wherein said annular supports are present in a number N in a radial direction₁Not less than 0, when N₁When 0, i.e. the annular support is not present; when N is present₁1 or more, i.e. said toroidal support is present concentrically to the non-pneumatic tyre and uniformly or non-uniformly distributed along the radial direction of the tyre.

4. A graded-elasticity non-pneumatic tire as in claim 1, wherein said anchor bars comprise a first anchor bar and a second anchor bar, said first anchor bar connecting said inner breaker ply and said toroidal support; the second fixing strip penetrates through the annular supporting piece and is connected with the inner buffer layer, the annular supporting piece and the outer buffer layer; two adjacent second fixing stripsThe number of the first fixed strips between is N₂Not less than 0, when N₂When 0, the first fixing strip is not present; when N is present₂And when the value is more than or equal to 1, the first fixing strip exists.

5. A resiliently progressive non-pneumatic tire as claimed in claim 1, wherein said holding strip is linear or curvilinear, wherein curvilinear comprises any single radius or varying radius arc; the fixing strips are uniformly distributed at intervals along the circumferential direction of the tire and are radially arranged from the inner buffer layer to the annular support piece or the outer buffer layer along the tire.

6. The non-pneumatic tire of claim 1, wherein the tie bars in combination with the annular support members form a plurality of hollowed-out areas for receiving the filler, the hollowed-out areas including a first hollowed-out area and a second hollowed-out area; the first hollow-out area is positioned between the inner buffer layer and the annular support piece, and the second hollow-out area is positioned between the annular support piece and the outer buffer layer; the fillers in the first hollow-out area and the second hollow-out area are the same or different.

7. The non-pneumatic tire with gradually changed elasticity as claimed in claim 1, wherein said filler is a soft microcellular foam having elasticity, and is formed of one or more of polyurethane, resin and rubber; the density, the micropore size and the quantity of the filler are changed in a gradient manner; i.e. gradually increasing or decreasing from the inside to the outside in the radial direction of the tire.

8. A method of manufacturing a non-pneumatic tire having a gradual change in elasticity as claimed in any one of claims 1 to 7, comprising the steps of: