JP2008296775A - Annular structure body for safety tire, safety tire, and safety tire assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular structure body for a safety tire capable of being easily manufactured at low cost in which a conventional general rim can be used, it is not required that a particular valve is auxiliarily provided on a side wall part of a pneumatic tire and there is no fear of reduction of durability caused by unexpected contact of a run flat carrier stored in the pneumatic tire with an inner surface of the tire. <P>SOLUTION: The hollow annular structure body 3 for the safety tire is arranged at an inner side of the pneumatic tire 1 provided with a tread part 5, a pair of side wall parts 6 continued to respective side parts of the tread part 5 and extending to an inner side in a radial direction, and a bead part 7 continued to an inner peripheral sides of the respective side wall parts 6. The expansion-deformable annular structure body 3 has joint parts 14 at two positions on a periphery in a meridian cross section and has a ventilation part for performing communication of the inner side with the outer side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention provides a safety tire for a safety tire that enables a safe stop of a vehicle over a certain distance as well as a safe stop of a vehicle even when the internal pressure of the pneumatic tire is suddenly reduced due to puncture or the like. The present invention relates to a hollow annular structure, a safety tire and a safety tire assembly, and in particular, proposes a technology for improving the versatility of a safety tire while realizing weight reduction and cost reduction of the safety tire and the assembly. It is.

Conventional safety tires include pneumatic tires, foams, elastic bodies, cores, etc. that support the load of pneumatic tires as a shoulder when pneumatic tires are punctured, It is known that a tire land pressure is applied or filled in a tire and a damaged portion such as a hole generated in the tire is closed with the sealand agent to prevent a decrease in tire internal pressure.

However, such a conventional safety tire has a complicated structure, so that the occurrence rate of defective products may be increased or the production efficiency may be reduced, and the air is filled with air. In some cases, it is necessary to prepare a dedicated rim having a structure for mounting the valve and the core, and a relatively large increase in the weight and cost of the safety tire cannot be denied.

On the other hand, as a safety tire having a relatively simple structure, Patent Document 1 discloses that an inner space of a tire is adjacent to a rim by an inflatable annular diaphragm disposed between both bead portions of a pneumatic tire. It describes what is divided into two chambers, an inner chamber and an outer chamber adjacent to the inner surface of the tread.

These safety tires run normally with the inner chamber and the outer chamber filled with air, and when the pressure in the outer chamber drops due to the puncture of the pneumatic tire, Run-flat running is possible because the internal pressure of the chamber supports the load.
Japanese Examined Patent Publication No. 37-1754

By the way, in the safety tire described in Patent Document 1, it is necessary to provide a valve for filling the outer chamber with air in a sidewall portion of the pneumatic tire. This is a pneumatic tire, and thus a safety tire. In addition to complicating the manufacturing process, there is a problem in that the tire weight is increased and the performance such as tire uniformity is impaired.

The present invention has an object to solve such problems of the prior art, and the object of the present invention is a safety tire with a simple structure, defective product occurrence rate, manufacturing efficiency, The conventional general rim can be used while maintaining the advantages of using a special core, etc., and it is not necessary to attach a special valve to the sidewall of the pneumatic tire.
Moreover, an annular structure that can be easily and inexpensively manufactured for a safety tire that does not have a risk of deterioration in durability caused by unexpected contact of the run-flat carrier housed in the pneumatic tire with the tire inner surface, and the annular structure thereof It is an object of the present invention to provide a safety tire using a structure and a safety tire assembly formed by assembling the safety tire with a rim.

An annular structure for a safety tire according to the present invention includes a tread portion, a pair of sidewall portions extending inward in the radial direction continuously to the respective side portions of the tread portion, and continuous to the inner peripheral side of each sidewall portion. A hollow annular structure that is housed inside a pneumatic tire having a general radial structure or a bias structure, and that is inflatable and deformable. Peripheries in the cross section, at two or more locations, for example, endless molded bodies, which have continuous or intermittent joints in the circumferential direction of the annular structure, and vents that provide internal and external communication It has to have.

In this case, the annular structure is continuous over the entire circumference of the annular structure at a plurality of locations within the meridian cross section thereof, for example, having joints hermetically sealed by a rubber gasket, a sealing material, etc. It may have one or more throttle passages as a ventilation part.

The term “airtight sealing” as used herein does not necessarily require complete airtightness, and there are cases where airtightness is improved as compared to the case where no bomb gasket, sealing material, etc. are provided. Shall be included.

In addition, the throttle passage can be a small hole having a diameter of 5 mm or less, with or without a valve member such as a check valve, a relief valve, and a flutter valve.
A filter, a nonwoven fabric, or the like that causes an increase in flow resistance may be attached.

Here, it is needless to say that the annular structure can be composed of, for example, rubber, a composite of rubber and nonwoven fabric, or the like. More preferably, the annular structure has an elongation at break of 50.
% Of TPO resin (olefin-based thermoplastic elastomer) or other gas barrier thermoplastic resin material.

By the way, the throttle passage can be provided on the outer peripheral side portion of the annular structure, for example, on the equator line, or a plurality at a predetermined interval in the circumferential direction of the structure. In addition, one or more inner peripheral portions can also be provided.

When one or more throttle passages are provided also on the inner peripheral side portion of the annular structure, the throttle passages are provided to be opened to the mounting position side of the tire valve to the applicable rim to be assembled to the pneumatic tire. Is preferred.

In addition, the joint portion of the annular structure can be, for example, a threaded portion of two or more endless molded bodies, and can be subjected to elastic deformation of at least one of a small hole and a rivet-shaped retaining protrusion. It can be set as the penetration fitting part which fits in, the male and female fitting part which becomes fitting of a groove and a protrusion, or a welding part.

In addition, when the joint portion is a welded portion, the joint portion can be provided continuously over the entire circumference of the annular structure, in addition to being intermittently provided in the circumferential direction of the annular structure. The inside and the outside of the annular structure can be easily made into a completely airtight state without using a special gasket, sealant or the like.

Here, this welding part is, for example, heat welding using friction heat, hot air, a heat seal plate,
Alternatively, it can be formed by impulse sealing, high-frequency welder sealing, ultrasonic sealing, thermal welding by laser beam irradiation, or the like.

The safety tire according to the present invention is one in which any of the above-described annular structures is housed in a pneumatic tire. Further, the safety tire assembly according to the present invention is the above safety tire. A pneumatic tire is assembled to a general applicable rim defined by a standard.

In the safety tire assembly, the inner diameter of the annular structure may be smaller than the outer diameter of the rim flange in a state in which the pneumatic tire and the annular structure are filled with required air pressure. It is suitable for realizing secure fixing to the.

By the way, in the claims and the specification, the term “applicable rim” refers to a rim defined in the standard according to the tire size, and the standard refers to the area where the tire is produced or used. For example, “THE TIRE AND RIM ASSOCIATHION INC. YEAR BOOK” in the United States, and “TH
E European Tire and Rim Technical Organization's STANDARDS MANUAL ”, and in Japan, the Japan Auto Tire Association's“ JATMA YEAR BOOK ”.

A hollow annular structure for a pneumatic tire according to the present invention has joints at a plurality of locations in a peripheral in a meridian cross section, and the annular structure includes, for example, a plurality of annular endless molded bodies. Since the pieces can be manufactured afterwards by joining them together in the circumferential direction, a similar structure that is difficult to manufacture with vacuum or injection molding is simple, easy, and inexpensive. Can be manufactured.

By the way, since the annular structure has a ventilation portion that provides communication between the inside and the outside of the annular structure, in the rim assembly of a safety tire in which the annular structure is housed in a pneumatic tire,
When air of a predetermined pressure is filled into a pneumatic tire via a tire valve, the air is filled not only in the pneumatic tire but also in the annular structure through the ventilation portion. Here, it is not necessary to provide an air filling valve or the like unique to the annular structure.
Therefore, here, the structure of the annular structure can be simplified, an increase in the weight of the structure can be advantageously suppressed, and the risk of deterioration in performance such as safety tire uniformity can be effectively eliminated. .
In addition, in the place mentioned above, it is also possible to replace air with other inert gas, such as nitrogen gas.

In this way, when the pneumatic tire is punctured or the like and the tire internal pressure is suddenly reduced due to the load rolling of the safety tire assembly filled with air pressure or the like, the internal pressure of the annular structure is The ring structure itself is inflated and deformed based on the pressure difference between the inside and outside of the pneumatic tire before it flows out into the pneumatic tire. Therefore, the vehicle can be safely stopped, and safe continuous travel at a certain distance is ensured.

Thus, according to the annular structure for a safety tire, in addition to being able to manufacture itself easily and inexpensively, the structure of the safety tire is made simple by simply storing the annular structure in a conventional pneumatic tire. In addition to suppressing the occurrence of defective products, increasing the production efficiency, enabling the use of general rims, and eliminating the need for valves on the sidewalls, etc. Can be realized.

Here, the annular structure has one or more artificially formed apertures having airtight joints continuous over the entire circumference of the annular structure at a plurality of locations in the periphery of the meridian section and as a ventilation part. When it has a passage, it is possible to control the inflow and outflow of pressurized air with respect to the annular structure with higher accuracy, and when the pneumatic tire is punctured, the annular structure The expansion speed and the like can be controlled as required.

Here, when the annular structure is made of a thermoplastic resin material having an elongation at break of 50% or more, when the pneumatic tire is normal, the outer diameter of the annular structure is kept small to keep the pneumatic structure When the tire is punctured or the like, it can be inflated sufficiently large so that the shoulder support of the load on the pneumatic tire is always ensured.

Here, by making the annular structure made of a thermoplastic resin material, it can be recovered after use of the annular structure and returned to the raw material again, so that resource saving can be achieved.

Here, in the case where one or more throttle passages are provided not only on the outer peripheral side portion of the annular structure but also on the inner peripheral side portion, in particular, under the action of the throttle passage on the inner peripheral side portion, the tire valve The air of a predetermined pressure filled into the pneumatic tire can be smoothly and rapidly made to flow into the annular structure. This means that the throttle passage on the inner peripheral side is connected to the pneumatic tire. This is particularly conspicuous when the tire valve is provided on the side where the tire valve is attached to the applicable rim to be assembled to the rim.

When the joint portion of the annular structure as described above is used as a threaded portion, it is possible to join only by screwing two or more structural members, regardless of whether a rubber gasket, a sealing material, or the like is applied. Thus, the annular structure can be configured easily and easily.

In addition, when the joint portion of the annular structure is a through-fitting portion that fits like a snap fit between the small hole and the retaining protrusion, this also constitutes the annular structure easily. Can do. This also applies to the case where the joint portion is a male / female fitting portion that fits between the groove and the protrusion. In addition, this male-female fitting part can also be formed, for example, in an overlapping portion of the annular endless molded body, and is formed to project outward in the radial direction on each side portion of the endless molded body, It can also be formed in mutually opposing flange portions.

When the welded portion of the annular structure is used as a welded portion, at least at the welded portion, it is possible to ensure complete airtightness inside and outside without using a rubber gasket, a sealing material, or the like. Therefore, by intentionally providing a non-welded part, the non-welded part can also function as a ventilation part or a throttle passage.

On the other hand, when the welded portion is provided continuously over the entire circumference of the annular structure, the inside and the outside can be made completely airtight.

FIG. 1 is a meridian cross-sectional view showing an embodiment of a safety tire assembly according to the present invention, which shows a maximum load applied to each of a pneumatic tire and an annular structure at a predetermined air pressure, for example, the previous standard. It is shown in a state of being filled with a “specified air pressure” specified in accordance with the capacity.
Here, the “air pressure” can be replaced by the gas pressure of nitrogen gas or other inert gas.

In the figure, reference numeral 1 denotes a general pneumatic tire having a radial structure or bias structure as defined in the standard, and 2 denotes an applied rim assembled to the pneumatic tire 1. Reference numeral 3 denotes a hollow annular structure housed in the pneumatic tire 1. Here, a safety tire is constituted by the pneumatic tire 1 and the annular structure 3 housed therein. A safety tire assembly is configured by assembling the entering tire 1 to the applicable rim 2.

Here, the hollow annular structure 3 is, for example, rubber, a composite of rubber and non-woven fabric, T
Using a gas barrier material such as PO resin (olefin-based thermoplastic elastomer), 1-4m
The annular structure 3 has a smaller inner diameter d than the outer diameter D of the rim flange 4 in the illustrated pneumatic filling posture. It is preferable in order to ensure sufficient fixation.

Such an annular structure 3 is inflated and deformed based on the pressure difference between the inside and outside of the pneumatic tire 1 due to a sudden decrease in tire air pressure due to puncture or the like of the pneumatic tire 1, preferably on the inner surface of the pneumatic tire 1. It adheres evenly over the entire surface to prevent crushing deformation of the pneumatic tire 1,
It functions to support the load of the pneumatic tire 1 instead of the shoulder and to enable a safe stop of the vehicle.

By the way, when the annular structure 3 is expanded and deformed in this manner while maintaining gas barrier properties, it is made of a thermoplastic resin material having an elongation at break of 50% or more, for example, a TPO resin. It is preferable.

Here, when TPO resin is used, in addition to being able to impart the required elongation to the annular structure 3, the weight of the annular structure 3 is reduced, the shape of the annular structure 3 is maintained during normal travel, and creep deformation is caused by centrifugal force. It is preferable to realize the suppression.
Moreover, it is preferable to make the thickness of the annular structure 3 into the range of 0.3-3.0 mm. That is, if the thickness is less than 0.3 mm, when the annular structure 3 comes into contact with the tire inner surface, it may interfere with foreign matter and cause damage thereto, and the annular structure 3 may be damaged during diameter expansion deformation. This is because, if it exceeds 3.0 mm, the mass increases, and as a result, the generation of creep due to centrifugal force and the tire performance such as fuel efficiency may be impaired.

In the illustrated pneumatic tire, 5 is a tread portion, 6 is a pair of sidewall portions extending inward in the radial direction continuously to the respective side portions of the tread portion 5, and 7 is each A bead portion continuous on the inner peripheral side of the sidewall portion 6 is shown.

The pneumatic tire 1 having a general structure is disposed in a pair of bead cores 8 disposed in each bead portion 7 by extending, for example, a carcass 9 that can have a radial structure in a toroidal manner, On the outer peripheral side of the crown region of the radial carcass 9, a belt 10
And the tread rubber 11 are sequentially disposed. In the safety tire shown here, the inner surface of the inner liner 1a of the pneumatic tire 1 is formed along the periphery in the meridian section of the annular structure 3, for example. The peripheral surfaces of the ribs 12 are arranged in contact with each other.

In the safety tire assembly in which such a safety tire is assembled to the applicable rim 2, when the predetermined air pressure is filled into the tire 1 from the tire valve 13 attached to the rim 2, the filling air is annular. It can flow smoothly between the ribs 12 of the structure 3 and the entire inner cavity of the tire 1, and the annular shape by the filling air pressure to the tire 1 under the inherent reinforcing function of the rib 12 itself. Unexpected crushing deformation of the structure 3 can be effectively prevented.

In addition, the rib 12 here can be of a spiral winding structure that is continuous in the circumferential direction of the annular structure 3, or of a ring structure that is positioned at a predetermined interval in the circumferential direction. You can also.

Further, here, the hollow annular structure 3 that can be expanded and deformed as described above is joined to two or more locations, for example, two locations facing each other in the diametrical direction, with a peripheral in the meridian cross section as shown in the figure. In addition to having the portion 14, it is ensured that the air pressure is reliably filled into the annular structure 3 based on the filling of the air pressure in the pneumatic tire 1 from the tire valve 13 provided on the rim 2. It shall have a ventilation part (not shown) that functions as necessary.

Here, the ventilation portion of the annular structure 3 is also related to the structure of the joint portion between two or more endless molded bodies that can be molded by, for example, vacuum molding, injection molding, hot press molding, etc. In general, when the joint portion is not hermetically sealed using a rubber gasket, a sealing material or the like, a naturally occurring gap at each joint portion can function as the ventilation portion, One or more throttle passages formed artificially can function as a ventilation part, or a combination of these can be used as a ventilation part.

When the throttle passage is provided, one or a plurality of throttle passages provided at predetermined intervals in the circumferential direction are provided at least on the outer peripheral side portion of the annular structure 3 and sometimes also on the inner peripheral side portion. Depending on the total area, the flow rate of the pressurized air flowing into or out of the annular structure 3 through the throttle passage can be controlled as necessary.

By the way, this throttle passage can be constituted by various valve members, for example, each can be a small hole having a hole diameter in the range of 0.5 to 5 mm. The structure can be simplified and the increase in weight can be suppressed as compared with the case of using a member, and the influence on the uniformity of the safety tire assembly can be reduced to a negligible level.

In addition, when the small hole as the throttle passage provided in the annular structure 3 is covered with a filter, a nonwoven fabric, etc. and the flow resistance of the pressurized air passing therethrough is increased, the pneumatic tire 1 is punctured, As expected, based on the differential pressure of the structure 3 with respect to the tire internal pressure by reducing the flow rate of the pressurized air from the throttle passage into the tire 1 when the tire internal pressure suddenly decreases. This is advantageous in ensuring that the expansion of the gas is performed.

In the above description, when one or more throttle passages are formed not only on the outer peripheral side portion of the annular structure 3 but also on the inner peripheral side portion, the throttle passage is used as a tire valve 13 to the applicable rim 2. It is preferable to provide it toward the mounting position side in order to smoothly and quickly take in the compressed air filled into the tire 1 from the valve 13 into the annular structure 3.

Further, the joint portion 14 of, for example, two endless molded bodies of such an annular structure 3 is recessed in a substantially semicircular shape as illustrated in a cross-sectional perspective view in FIG. Here, the meridian cross section shown in FIG. 2 (b) is formed by screwing a male screw portion 16a and a female screw portion 16b provided at the inner and outer ends in the radial direction of each of the two endless halves 15 having no ribs. As shown in FIG. 3, the flanges 18a, 18b, and 19a at the radially inner and outer ends of the two endless halves 15 can be formed.
, 19b, a small hole 20 provided alternately at a predetermined interval in the circumferential direction, and a retaining projection 21 having a retaining head at the tip, and a meridian cross-sectional view in FIG. It can also be formed by a through-fitting portion 22 as shown in FIG.

Such a joining portion 14 is formed by a gap generated in the screwing portion 17 and the through fitting portion 22.
Although it will inevitably have a ventilation part, for example, in the screwing part 17 and the penetration fitting part 22,
By applying a rubber gasket, a sealing material or the like as required, the annular structure 3 can have sufficient or complete airtightness.

FIG. 4 is a diagram showing another example of forming the joint 14, which includes two endless halves 15.
For example, the groove 23 and the protrusion 24 which are provided at the inner and outer ends in the radial direction and which are continuously or intermittently positioned in the circumferential direction are fitted together under elastic deformation of the groove 23, for example. A joint portion is formed by the male / female fitting portion 25.

Such a male / female fitting portion 25 also has a gap without a special sealing process or the like.
Although it has an inevitable ventilation part, the ventilation part can be increased as needed by forming the male-female fitting part 25 at intervals in the circumferential direction.

FIG. 5 shows that the inner and outer end portions in the radial direction of each of the two endless halves 15 are superposed on each other, and the superposed end portions are mutually joined by, for example, frictional heat, hot air, a heat seal plate, etc. The example which formed the junction part 14 by the welding part 26 formed by welding is shown.

When the joining portion 14 is formed by such a welded portion 26, the annular structure 3 is formed in an airtight structure without using a sealant or the like by providing the welded portion 26 continuously over the entire circumference. Can do.
Therefore, the artificial remaining of the ventilation part in the annular structure 3 can be realized by providing the welding part 26 at a predetermined interval at one or more places in the circumferential direction.

In various joint portions 14 as described above, when it is hermetically sealed using a rubber gasket, a sealing material or the like, at least the outer peripheral side portion of the configured annular structure 3, depending on the case, It is possible to provide a throttle passage as described above as a ventilation portion in one or more places on the inner peripheral side portion in addition to the outer peripheral side portion, so that the air charged into the tire 1 flows into the annular structure 3 It is necessary to make it.
In any of the above-described fields, it is not necessary that the meridian cross-sectional shape of the annular structure 3 formed by joining at the joint portion 14 is a perfect circle.

The safety tire using the annular structure 3 configured as described above is a pneumatic tire 1.
Such a safety tire can be configured as a safety tire assembly in which the pneumatic tire 1 is assembled to the applied rim 2, and the pneumatic tire 1 and the annular structure 3. Each can be used by filling with a predetermined air pressure as shown in FIG.

FIG. 6 is a meridian cross-sectional view similar to FIG. 1 showing another embodiment of the safety tire assembly.
This is because the annular structure 3 is made of a material in which 3% carbon is blended with TPO resin that is 52% polyethylene and 48% polypropylene, and two endless molded bodies 15 having a thickness of about 2 mm are shown in FIG. As shown in FIG. 3, it is joined by a joining portion 14 composed of through-fitting portions 22 arranged at equal intervals at 90 locations on the circumference, and a rubber gasket (not shown) is applied to the joining portion 14 for airtightness. The annular structure 3 shown in FIG. 6A is formed as a throttle passage at a position corresponding to, for example, the central portion of the width of the tread portion 5 on the outer peripheral side portion thereof. A small hole 27 having a diameter of 2 mm is provided at one or more locations on the circumference.

In addition to the small hole 27 shown in FIG. 6A, the annular structure 3 shown in FIG. 6B includes an inner rim portion thereof, in particular, an applied rim 1 assembled to the pneumatic tire 1. The tire valve 13 is attached to the side of the tire valve 13 in the vicinity of the tire valve 13 and is provided with a small hole 28 having a diameter of 2 mm as another throttle passage at one or more places on the circumference. It is.
Each of the annular structures 3 shown in FIGS. 6A and 6B has an elongation at break of about 600% and a Young's modulus of about 50 MPa.

In such a safety tire assembly, when filling the pneumatic tire 1 with air of a predetermined pressure through the tire valve 13, the small structure 28 is inserted into the annular structure 3 shown in FIG.
Therefore, the air can be filled relatively easily and quickly.

On the other hand, the filling of air into the annular structure 3 shown in FIG. 6A in which the small holes 27 are provided only on the outer peripheral side portion is performed by the rib 12 as described above in which the annular structure 3 is along the periphery. The air that has entered the outer peripheral side of the annular structure 13 through the ribs from the tire valve 13 enters the structure 3 through the small holes 27 on the outer peripheral side portion. However, when the annular structure 3 does not have the rib 12 as shown in the figure, the annular structure 3 is subjected to the compressed air from the tire valve 13 under the displacement of the annular structure 3. Then, the annular structure 3 can be filled with air of a predetermined pressure by flowing into the structure 3 through the small holes 27.

In any of these cases, when the air pressure from the pneumatic tire 1 suddenly disappears, from the small holes 27 or the small holes 27 and 28 of the pressurized air in the annular structure 3. While effectively restricting the outflow of the annular structure 3, the annular structure 3 is expanded under the increased pressure difference between the inside and the outside of the annular structure 3.
By rapidly inflating and deforming and bringing it into contact with the inner surface of the pneumatic tire 1, the function expected of the safety tire can be sufficiently exhibited.

1 is a meridian cross-sectional view showing an embodiment of a safety tire assembly according to the present invention. It is a figure which illustrates the junction part of an annular structure. It is a figure which shows the example of a change of the junction part of a cyclic structure. It is a figure which shows the other example of a change of the junction part of a cyclic structure. It is a figure which shows the further another example of the junction part of a cyclic structure. It is meridian sectional drawing which shows other embodiment of a safety tire assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pneumatic tire 2 Applicable rim 3 Annular structure 4 Rim flange 5 Tread part 6 Side wall part 7 Bead part 12 Rib 13 Tire valve 14 Joint part 15 Endless half part 16a Male thread part 16b Female thread part 17 Threaded part 18a, 18b, 19a, 19b Flange 20 Small hole 21 Protrusion 22 Through fitting part 23 Groove 24 Projection 25 Male and female fitting part 26 Welding part 27, 28 Small hole D Outer diameter d Inner diameter

Claims (13)

The inside of a pneumatic tire comprising a tread portion, a pair of sidewall portions extending radially inward continuously to the respective side portions of the tread portion, and a bead portion continuing to the inner peripheral side of each sidewall portion A hollow annular structure for a safety tire,
This annular structure that can be inflated and deformed is a peripheral structure in a meridian section of the annular structure for safety tires that has joints at a plurality of locations and one or more ventilation parts that provide internal and external communication. . The annular structure has an airtight joint continuous over the entire circumference of the annular structure at a plurality of locations within the meridian section of the annular structure, and has one or more throttle passages as a ventilation portion. Item 2. The annular structure for a safety tire according to Item 1. The annular structure for a safety tire according to claim 1 or 2, wherein the annular structure is made of a thermoplastic resin material having an elongation at break of 50% or more. The annular structure for a safety tire according to any one of claims 1 to 3, wherein one or more throttle passages are provided in an outer peripheral side portion of the annular structure. The annular structure for a safety tire according to any one of claims 1 to 3, wherein one or more throttle passages are provided in each of an outer peripheral side portion and an inner peripheral side portion of the annular structure. The annular structure for a safety tire according to claim 5, wherein the throttle passage of the inner peripheral side portion is provided on a side where the tire valve is attached to an application rim to be assembled to the pneumatic tire. The annular structure for a safety tire according to any one of claims 1 to 6, wherein a joint portion of the annular structure is used as a threaded portion. The annular structure for a safety tire according to any one of claims 1 to 6, wherein the joint portion of the annular structure is a through fitting portion that fits between the small hole and the retaining protrusion. The joint portion of the annular structure is a male-female fitting portion that fits between the groove and the protrusion.
The annular structure for safety tires according to any one of -6. The annular structure for a safety tire according to any one of claims 1 to 6, wherein a joint portion of the annular structure is used as a welded part. The annular structure for a safety tire according to claim 10, wherein the welded portion is provided continuously over the entire circumference of the annular structure. A safety tire obtained by housing the annular structure according to any one of claims 1 to 11 in a pneumatic tire. A safety tire assembly obtained by assembling the pneumatic tire of the safety tire according to claim 12 to an applicable rim.

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