JP2003118332A - Tire-rim assembly body having satisfactory self-sealing property and self-balancing property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety tire and a rim assembly body capable of improving the durability and riding comfortableness in running before the tire is damaged, suppressing abrupt reduction of an internal pressure of the tire even after the tire is externally damaged by foreign matter, and realizing a longer running distance. SOLUTION: The hollow doughnut-like tire is mounted on an application rim. Particle composition with true specific gravity 0.01 or more, and volume under the atmospheric pressure in the range of 5.0-100 volume % or less of tire internal volume, and with mass 20 grams or more are arranged in the inside of the tire divided by the tire and the application rim.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire-rim assembly excellent in self-sealing property and self-balancing property, and particularly to sacrifice durability and riding comfort in normal running where the tire is not damaged. It is possible to reliably avoid a critical situation by suppressing a rapid decrease in tire internal pressure after being injured, and it is possible to further increase the distance that can be traveled after being injured. The present invention relates to a tire-rim assembly having safety and self-sealing and self-balancing.

[0002]

2. Description of the Related Art In a pneumatic tire, for example, a passenger car tire, internal pressure (absolute pressure, the same applies hereinafter) inside the tire.
Air is trapped under about 250 to 350 kPa to generate tension in the tire skeleton such as the carcass and belt of the tire, and this tension enables deformation and restoration of the tire against input to the tire. That is, by keeping the internal pressure of the tire within a predetermined range, a constant tension is generated in the skeleton of the tire to provide a load supporting function, and rigidity is increased, such as driving, braking and turning performance. It gives the basic performance required for vehicle running.

When the tire held at the predetermined internal pressure is damaged, air leaks to the outside through the damage and the tire internal pressure is reduced to atmospheric pressure, which is a so-called puncture state. Most of the tension generated in the part is lost. Then, as a result of losing the load supporting function, driving, braking and turning performance obtained by applying a predetermined internal pressure to the tire, the vehicle equipped with the tire becomes unable to run.

In general, most flat tires are generated by piercing a tire with a hard and sharp foreign object such as a nail or a metal piece. Among them, a particularly dangerous situation for a general driver is when the foreign object piercing a tire is running. This is the case where a sudden drop in internal pressure occurs due to falling off. Especially, if the damaged tire is the steering wheel (front wheel in most vehicles), sudden changes in left / right balance and front / rear balance may cause uncontrollable vehicle behavior, which may lead to a large-scale accident. May cause a very dangerous situation.

Therefore, many proposals have been made for a safety tire that enables traveling even in a punctured state. For example, various types of pneumatic safety tire and rim assemblies for automobiles have a double wall structure, a load supporting device is provided in the tire, a tire side portion is reinforced, and the like. Is proposed. Among these proposals, the technique actually used is a tire having a side reinforcing layer made of relatively hard rubber on the inner surface from the shoulder portion to the bead portion centering on the sidewall portion of the tire. However, this type of tire is mainly applied as a so-called run-flat tire having a flatness ratio of 60% or less.

However, the method of adding the side reinforcement layer increases the vertical spring constant of the tire by increasing the tire mass by 30 to 40%, so that the rolling resistance is greatly deteriorated and the vehicle is normally driven before puncture. There is a disadvantage that leads to a decrease in comfort. In addition, due to the limitations of the current manufacturing method, the uniformity (uniformity) of side-reinforced run-flat tires tends to deteriorate. Generally, after the rim is assembled, the tire is rotated at a predetermined number of revolutions using a so-called balancer to detect the unbalanced component, calculate the detected unbalanced component, and give an instruction on the rim derived from this calculation result. A balance weight is placed at the position to suppress the unbalanced component. However, during use, since the tire-rim assembly is used in a wide speed range other than the above-described rotational speed, a relatively large residual unbalance component may appear due to rolling depending on the speed. Therefore, as a result, maneuverability and riding comfort may be deteriorated, and the side-reinforced runflat tire may adversely affect performance during normal running, fuel consumption, and the environment. Also, not only run-flat tires, but also general conventional pneumatic tires,
The balance weight of the tire-rim assembly may collapse due to the occurrence of so-called rim slip, which causes the relative positional relationship between the tire and the rim to shift due to frequent braking / driving inputs. Therefore, as long as the balance weight is used, there are still factors that deteriorate the maneuverability and riding comfort.
It is not always satisfactory.

On the other hand, in a pneumatic tire having a high tire cross-section height and an aspect ratio of 60% or more, in order to avoid heat generation in the sidewall portion due to traveling at a relatively high speed and a long distance, a core or the like is attached to the rim. Run-flat tires having a structure in which the internal support of is fixed to support the load at the time of puncture are mainly applied.

However, the tire cannot withstand the local repetitive stress generated between the tire and the internal support during the run-flat after the puncture, and as a result, the mileage after the puncture is about 100 to 200 km. Was limited to. Further, it is difficult to reduce the weight of the internal support in terms of impact durability, and as a result, the total mass of the tire, the internal support, and the rim increases by 30 to 50% or more as compared with the conventional pneumatic tire. Therefore, not only is the riding comfort reduced during normal running before puncture, but there is also the disadvantage that the durability of the bushing, which is an underbody component of the vehicle, is significantly impaired. In addition, the work of assembling the tire on the rim after disposing the inner support inside the tire is complicated and requires a long time, which is also a problem. In this regard, there has been proposed a device for facilitating the insertion of the internal support by providing a difference in the rim diameter between the one end side and the other end side in the width direction of the rim, but the sufficient effect has not been obtained.

It is effective to add a frame material to make the tire structure heavier in order to extend the mileage after puncture of a run-flat tire having an internal support.
The addition of the skeletal material deteriorates rolling resistance and riding comfort during normal use, so it is not practical to adopt this method.

Further, although the above-mentioned prior art refers to the running ability after the internal pressure decreases due to the damage to the tire,
As described above, it is not possible to deal with a situation where the internal pressure suddenly drops due to the stuck foreign matter falling off during traveling, and it cannot be said that the risk avoidance measures against puncture are sufficient.

On the other hand, various techniques have been proposed in which a sealant material having fluidity is previously disposed on the inner surface of a tire and the pressure inside the tire is utilized to instantly seal a scratch hole after being damaged.
There is a disadvantage leading to an increase in tire mass. That is, the ability of the sealant material to seal the wound hole depends on the thickness of the sealant material layer provided on the inner surface of the tire. For example, to seal the wound hole with a nail having a diameter of about 3 mm, the sealant material layer has a thickness of about 3 to 5 mm. Thickness is required. Therefore, in the case of a typical passenger car tire, the mass can be reduced to 1 by arranging the sealant material.
The amount also increases by 500 g to 2500 g, which not only reduces rolling resistance and riding comfort during normal running before puncture but also significantly impairs durability of bushes and the like which are undercarriage parts of the vehicle. In addition, the tire in which the sealant material is arranged has poor mass uniformity, and is a main factor of rolling resistance and deterioration of riding comfort during normal traveling.

Further, when a foreign substance such as a nail is stabbed while the tire is being used, the foreign substance such as a nail does not always fall out immediately, but may remain in the tire in a penetrating state. In such a state, the internal pressure of the tire does not immediately drop, and as the foreign matter such as nails is rubbed inside the tire as it is rubbed while the vehicle is running, the foreign matter such as nails and the tire are not received. Rubbing occurs on the contact surface of. Due to this rubbing, when the tire rubber in the contact portion is worn away to some extent, a gap is created in the contact surface,
Suddenly, a foreign object such as a nail is detached at a certain time, and the internal pressure is suddenly reduced to make the vehicle unable to run. Conventional tires provided with a sealant material are not satisfactory because they cannot sufficiently cope with the sudden foreign matter detachment and the internal pressure drop caused by the input history of residual foreign matter as described above.

Various tires have been proposed in which the inner cavity of an assembly of a tire and a rim to be assembled with the tire is filled with a foam having closed cells (for example, Japanese Patent Laid-Open No. 6-127).
207, JP-A-6-183226, JP-A-7-186610, and JP-A-8-332805). These proposed tires are mainly limited to special or small tires such as agricultural tires, rally tires, motorcycle tires and bicycle tires. Therefore, its application to tires for passenger cars, tires for trucks and buses, such as tires that emphasize rolling resistance and riding comfort, has been unknown. Since all foams have a low expansion ratio, they have a large mass in place of the foams having bubbles, and the vibration riding comfort and fuel economy are unavoidably deteriorated, and the inside of the closed cells is at atmospheric pressure. Therefore, it was not functionally sufficient as a substitute for the high pressure air of the conventional tire.

Further, Japanese Patent No. 2987076 discloses that
Although a puncture tire in which a foam filler is inserted in the inner peripheral portion is disclosed, in addition to the disadvantage that the internal pressure of the bubbles is extremely close to the atmospheric pressure, since the foam is a urethane type, the intermolecular hydrogen of the urethane group is Energy loss due to bonding is large and self-heating is high. Therefore, when the urethane foam is filled in the tire, repeated deformation during rolling of the tire causes the foam to generate heat, resulting in a significant decrease in durability. In addition, since it is difficult to form air bubbles independently of each other, it is difficult for the air bubbles to communicate with each other and it is difficult to hold the gas, and the desired tire internal pressure (that is, load bearing ability or deflection suppressing ability, the same below) ) There is a disadvantage that cannot be obtained.

Furthermore, in Japanese Unexamined Patent Publication No. 48-47002, the outer periphery of a multi-cellular body consisting mainly of closed cells is integrally wrapped with an outer coating film of rubber or synthetic resin having a thickness of 0.5 to 3 mm. Fill the tire with a large number of expanded pressure bubbles that are sealed,
A puncture tire in which the tire is maintained at a specified internal pressure has been proposed. In this technique, in order to make the bubble internal pressure of the foam higher than normal pressure, the amount of the foaming agent compounded in the closed foam forming compound material that becomes the expansion pressure bubble is at least equal to or more than the tire internal volume. The amount of foaming agent that generates gas is set so that at least the same performance as ordinary pneumatic tires is aimed at.

[0016] In the above technique, in order to prevent the gas in the bubbles in the expanded pressure bubbles from being dissipated, the outer envelope film is integrally encapsulated and sealed. The material of the outer envelope film is exemplified as an automobile. Material such as a tube for use or a formulation for forming the tube. In other words, a soft elastic envelope film mainly composed of butyl rubber having a low nitrogen gas permeability, which is used for a tire tube or the like, is used for covering and sealing, and many of these are filled in the tire. As the manufacturing method, an unvulcanized tire tube is used as the soft elastic envelope film, and an unvulcanized closed-cell-body-forming compounded raw material is used as the expansion pressure bubble.
A large number of these are placed inside a tire / rim assembly and then foamed by heating to obtain a foam-filled tire. The atmospheric air inside the tire due to the expansion of the foam is naturally exhausted from the exhaust small holes formed in the rim.

Since the internal pressure of passenger car tires is generally set to about 250 to 350 kPa in absolute pressure at room temperature, the above foam-filled tire is produced by heating during vulcanization molding. It is estimated from the equation of state of gas that the internal pressure is approximately 1.5 times the internal pressure in the state of (140 ° C.). However, at such a pressure level, it is unavoidable that the vulcanization pressure is insufficient and blown out. In order to avoid this blown phenomenon, it is necessary to greatly increase the compounding amount of the foaming agent to increase the pressure generated by foaming and increase the heating temperature. However, the method of increasing the amount of the foaming agent blended has been difficult to substitute for the conventional pneumatic tire because the internal pressure at room temperature greatly exceeds 400 kPa due to the increase of the blending amount of the foaming agent. In addition, the method of increasing the heating temperature causes a great deal of damage to the tire due to heat aging and significantly deteriorates the durability of the tire.
There is a problem with durability in long-term use. On the other hand, in the tire / rim assembly, a large number of expansion pressure air bubbles wrapped in a soft elastic envelope film are arranged. However, the blown-out friction between the soft elastic envelope films, the inner surface of the tire and the inner surface of the rim. There is a big problem in terms of durability such as friction with. From the above, it can be said that the above-mentioned problem is a large defect caused by disposing a large number of divided expanded pressure bubbles, unlike the case where the expanded pressure bubbles have an integral donut shape. Further, although the exhaust small hole formed in the rim is effective for naturally exhausting the normal pressure air inside the tire due to the expansion of the inflation pressure bubble, it does not function as a dissipation path for the gas in the bubble in the inflation pressure bubble. Therefore, it cannot withstand long-term use.

Further, as the soft elastic envelope film, a compounded composition mainly composed of butyl rubber having a small nitrogen gas permeability such as a tire tube is used. However, since butyl rubber has an extremely slow vulcanization reaction rate, A large heating time is required at a temperature of about 140 ° C. to complete the reaction. Needless to say, this means that the crosslink density of the soft elastic envelope film is insufficient, which is one of the factors that cause the soft elastic envelope film to peel (details will be described later). In addition, the extension of the heating time further increases the damage of the tire due to the heat aging described above, so that the deterioration of durability cannot be avoided,
Not a good idea.

[0019]

SUMMARY OF THE INVENTION Under such circumstances, it is an object of the present invention to solve various problems in the prior art and achieve the following objects. That is, the present invention is, first, to suppress a rapid decrease in tire internal pressure after being damaged, without sacrificing durability and riding comfort in normal running in which the tire is not damaged. It is an object of the present invention to provide a safe tire-rim assembly that allows a longer traveling distance after being damaged.

Secondly, according to the present invention, a particle composition in which bubble-containing particles and particles having a larger specific gravity than the bubble-containing particles are combined is arranged inside a tire-rim assembly. It is an object of the present invention to provide a tire-rim assembly that is excellent in self-balancing property and self-sealing property.

[0021]

In order to solve the above-mentioned problems, the present inventor does not sacrifice the performance during normal use of internal pressure, and on the precondition that the tire does not increase its mass significantly. While paying attention to the vibration caused by the weight balance during rolling, when foreign matter such as nails pierces the tire and remains as it is, the remaining foreign matter rubs against the contact surface with the tire and the tire rubber wears to some extent at the contact part. By creating a gap on the contact surface, foreign matter suddenly detaches from the tire and the tire internal pressure decreases at once.
As a result of diligent examination of how to control a situation that is very dangerous and unexpected for the driver, the true specific gravity is 0.01.
Above, the volume filling rate is in the range of 5.0% by volume or more and 100% by volume or less, and by placing the particle composition having a mass of 20 g or more in the tire, an extremely excellent self-sealing is achieved. The present invention has succeeded in exhibiting the effect and the self-balancing effect at the same time, and has completed the present invention.

That is, the present invention provides a tire-rim assembly having the following self-sealing and self-balancing properties, in order to solve the above problems.

According to a first aspect of the present invention, a hollow donut-shaped tire is mounted on the applicable rim, and the true specific gravity is 0.01 or more inside the tire divided by the tire and the applicable rim. The volume filling rate defined in 1) is in the range of 5.0% by volume or more and 100% by volume or less, and the mass is 20.
A tire-rim assembly rich in self-sealing property and self-balancing property, characterized in that a particle composition having a weight of gram or more is arranged. Volume filling rate = (Vs / Vt) × 100 (1) [where Vs is the volume (liter) of the particle composition disposed inside the tire under atmospheric pressure, and Vs is the volume around the particles] It shall include void volume. Vt represents the internal volume (liter) of the tire-rim assembly. ]

A second aspect of the invention is a particle composition in which the volume filling rate defined by the above formula (1) is in the range of 10.0% by volume or more and 100% by volume or less, and the mass is 50 g or more. The tire-rim assembly according to claim 1, wherein an object is arranged.

According to a third aspect of the invention, the particle composition is such that the volume filling rate defined by the above formula (1) is in the range of 20.0% by volume or more and 100% by volume or less, and the mass is 100 g or more. The tire-rim assembly according to claim 1 or 2, wherein an object is arranged.

According to a fourth aspect of the present invention, the volume composition defined by the above formula (1) is in the range of 75.0% by volume or more and 100% by volume or less, and the mass is 200 g or more. The tire-rim assembly according to any one of claims 1 to 3, wherein an object is arranged.

According to the invention of claim 5, the particle composition comprises particles A
And particles B, wherein the particles A are substantially spherical bubble-containing particles having a true specific gravity of 0.05 or less, and the particles B have a true specific gravity twice or more the true specific gravity of the particles A. The tire-rim assembly according to any one of 4 above.

According to a sixth aspect of the invention, particles A having a volume filling rate defined by the following formula (1) of 5.0% by volume or more and 0.1
The tire-rim assembly according to claim 5, wherein the particles B in a volume% or more are arranged. Volume filling rate = (Vs / Vt) × 100 (1) [where Vs is the volume (liter) of each particle placed inside the tire under atmospheric pressure, and Vs is the void around the particle] It shall include the volume. Vt represents the internal volume (liter) of the tire-rim assembly. ]

According to a seventh aspect of the invention, the particle A comprises a closed cell and a resin shell that encloses the cell in a closed state, and the resin is a polyvinyl alcohol resin, a polyacrylonitrile polymer, or a polyacrylic polymer. The tire-rim assembly according to claim 5 or 6, wherein the tire-rim assembly is formed of at least one selected from the group consisting of: and a polyvinylidene chloride-based polymer.

In the eighth aspect of the present invention, the gas in the closed cells contained in the particles A is nitrogen, air, a linear or branched aliphatic hydrocarbon having 2 to 8 carbon atoms, and a fluorinated product thereof.
An alicyclic hydrocarbon having 2 to 8 carbon atoms and a fluorinated compound thereof, and the following general formula (I): R ¹ —O—R ² ---- (I) (wherein R ¹ and R ² are Each independently has 1 carbon
At least 1 selected from the group consisting of a monovalent hydrocarbon group of 5 to 5 and some of the hydrogen atoms of the hydrocarbon group may be replaced with fluorine atoms). The tire-rim assembly according to any one of claims 5 to 7, which is a kind.

According to a ninth aspect of the invention, the internal pressure at 25 ° C. of the gas in the closed bubbles contained in the particles A is 150 absolute pressure.
The tire-rim assembly according to any one of claims 5 to 8, which has a kPa or more.

According to a tenth aspect of the invention, the internal pressure at 25 ° C. of the closed cells enclosed in the particle A is 200 kP in absolute pressure.
The tire-rim assembly according to claim 9, which is a or more.

According to the invention of claim 11, the resin shell of the particles A has a gas permeability coefficient of 300 × 10 at 30 ° C.
The tire-rim assembly according to any one of claims 5 to 10, which has a pressure of ^-12 (cc · cm / cm ² · s · cmHg) or less.

The invention of claim 12 is the tire-rim assembly according to any one of claims 5 to 11, wherein the particle B is a substantially spherical particle having a true specific gravity of 0.1 or more.

The thirteenth aspect of the present invention is the tire-rim assembly according to any one of the fifth to twelfth aspects, in which the particles B are made of an inorganic material.

In the fourteenth aspect of the present invention, the particle B has a diameter of 80
The tire-rim assembly according to any one of claims 5 to 13, wherein the tire-rim assembly has a particle size of not less than μm.

According to a fifteenth aspect of the invention, the particle B has a diameter of 10
The tire-rim assembly according to claim 14, wherein the particles have a particle size of 0 µm or more.

The invention according to claim 16 is the particle B, wherein the particle B contains a polymer having a true specific gravity of 0.1 or more and having fluidity and tackiness at 25 ° C. The tire-rim assembly according to item 1.

The invention of claim 17 is the tire-rim assembly according to claim 16, wherein the polymer is made of liquid rubber.

The invention of claim 18 is characterized in that the shell enclosing the polymer is formed of at least one selected from a polyacrylonitrile polymer, a polyacrylic polymer and a polyvinylidene chloride polymer. Alternatively, the tire-rim assembly according to item 17.

In the invention of claim 19, the particles B are particles of
The tire-rim assembly according to any one of claims 5 to 11, which is a mixture of the particles according to any one of 2 to 15 and the particles according to any one of claims 16 to 18. .

The invention of claim 20 is an assembly of a rim and any one of a passenger car tire, a truck tire, a bus tire, a motorcycle tire, a bicycle tire, a construction vehicle tire and an aircraft tire. Item 20. A tire-rim assembly according to any one of items 1 to 19.

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION A tire-rim assembly having excellent self-balancing properties according to an embodiment of the present invention will be described below with reference to FIG.

In the tire-rim assembly, the tire 1 is mounted on the applicable rim 2, and the true specific gravity is 0.01 or more inside the tire 1 defined by the tire 1 and the applicable rim 2.
The volume filling rate defined by the following formula (1) is in the range of 5.0% by volume or more and 100% by volume or less, and the mass is 20.
The particle composition 3 (bubble-containing particles A31 and particles B41) having a weight of gram or more is arranged. Note that, in FIG. 1, the arrangement of the particle composition 3 (air bubble-containing particles A31 and particles B41) represents a state in which the tire is running. Volume filling rate = (Vs / Vt) × 100 (1) [where Vs is the volume (liter) of the particle composition disposed inside the tire under atmospheric pressure, and Vs is the volume around the particles] It shall include void volume. Vt represents the internal volume (liter) of the tire-rim assembly. ]

The tire 1 is a tire for various automobiles, for example, a tire for passenger cars, which is generally compliant,
There is no particular need to limit the structure. For example, the tire shown in FIG. 1 is a general passenger car tire, and a crown portion of a carcass (one layer in the figure) 6 composed of one or more plies extending in a toroidal shape between a pair of bead portions 5 and 5 is provided. A belt (two layers in the figure) 7 and a tread 8 made up of two or more layers of plies are arranged in this order radially outward. The belt 7 may be provided with a protective layer such as a so-called cap layer or layer in order to improve the durability of the tire near the end thereof. Further, by disposing a reinforcing layer (for example, a rubber reinforcing layer having a crescent-shaped cross section) in the sidewall portion, the run flat performance of the tire can be significantly improved. In FIG. 1, 9 is an inner liner layer,
0 is a gas filled with high pressure, such as air or nitrogen gas.

As described above, the particle composition 3 of the present invention is one in which a hollow donut-shaped tire is mounted on the application rim and is arranged inside the tire divided by the tire and the application rim. True specific gravity is 0.01 or more, preferably 0.01 to 1.0, and more preferably 0.01 to 0.5.
It is preferable that the hollow body has a diameter of, for example, about 10 μm to 500 μm. This is because in order to develop the self-balancing effect, a part of the internal volume defined by the tire-rim assembly is occupied by the particle composition 3 which is a substance having mobility and mass. It is preferable to arrange them. Here, if the true specific gravity of the particle composition is less than 0.01, the absolute mass of the particle composition 3 may be insufficient, and the self-balancing effect may not be easily exhibited. This can be explained from the viewpoint of the mass of the particle composition 3, and the mass of the particle composition 3 is 20 g or more, preferably 50 g or more, more preferably 1 g.
The amount is 00 grams or more, more preferably 200 grams or more.

For the same reason, the volume filling rate of the particle composition 3 defined by the following formula (1) is in the range of 5.0% by volume to 100% by volume, preferably 10.
The range is 0% by volume or more and 100% by volume or less, more preferably 20.0% by volume or more and 100% by volume or less, further preferably 75% by volume or more and 100% by volume or less, and the mass is 20 g or more. . When the volume filling rate of the particle composition exceeds 100% by volume, the mobility in the tire during rolling of the tire is extremely reduced, and the self-balancing function cannot be exhibited. Volume filling rate = (Vs / Vt) × 100 (1) [where Vs is the volume (liter) of the particle composition disposed inside the tire under atmospheric pressure, and Vs is the volume around the particles] It shall include void volume. Vt represents the internal volume (liter) of the tire-rim assembly. ]

Here, the volume used of the particle composition was measured by weighing the particles in a graduated cylinder under atmospheric pressure and applying vibration in an ultrasonic water bath to stabilize packing between particles. Further, the tire internal volume is defined by the volume closed by the tire and the rim. Therefore, after assembling the rim to the tire, an incompressible fluid such as water having a known specific gravity was filled into the rim, and the tire internal volume was obtained from the increase in mass.

Thus, the tire-rim assembly in which the particle composition is arranged is occupied by the particle composition because the particle composition has an extremely low specific gravity as compared with particles made of a general material. The amount of increase in mass is small for the volume, and since the particle composition has no rigid relationship to the repeated deformation of the tire due to running, the rolling resistance and riding comfort during normal internal pressure running are normally reduced. It cannot be sacrificed.

A typical example of the particle composition 3 is as follows.
It is composed of two types of particles, particle A and particle B. As the particle A, bubble-containing particles A31 can be mentioned. That is, it is a particle which is surrounded by a continuous phase of a substantially spherical resin and contains closed cells which are closed without communicating with the outside. The number of closed cells may be singular or plural. Good. The bubble-containing particles A31 have a resin shell that encloses the closed cells in a closed state. Here, the continuous phase of the resin refers to the continuous phase in terms of the component composition that constitutes the resin shell.

The particle B41 has a true specific gravity of 0.1.
As described above, it is preferably a substantially spherical particle having a diameter of 0.1 to 1.0, and particularly preferably an inorganic material having a diameter of 50 μm or more or particles encapsulating a polymer having fluidity and adhesiveness at 25 ° C., It is also possible to use mixtures of these.

On the other hand, it is preferable that the particle composition 3 is composed of the following two kinds of particles in order to exhibit the self-sealing function. That is, the particle composition 3 contains a large number of the air bubble-containing particles A31 and a large number of the particles B41.
In the tire and the rim assembly arranged inside the tire, the tire is damaged by being pierced with foreign matter, etc., and then traveling with the foreign matter remaining in the tire causes a large contact surface between the foreign matter and the tire. When the friction is repeatedly generated and then the foreign matter comes off and the scratch is exposed, the particles B41 have an extremely effective action.

That is, the above-mentioned bubble-containing particles A31 and particles B4
No. 1 is in a state of being pressed against the inner surface of the tire by centrifugal force during rolling of the tire. Among them, the particle B41 whose true specific gravity is larger than that of the bubble-containing particle A31 is
Since the centrifugal force applied to the particles B41 is larger than that of the bubble-containing particles A31, the centrifugal force is greater in the vicinity of the tire inner surface than the bubble-containing particles A31. Therefore, particle B
By mounting the function of sealing the scratches in 41, the scratches are completely filled up, so that the scratches can be reliably sealed after the foreign matter is detached. Therefore, it is possible to avoid a sudden decrease in internal pressure, which was inevitable in the past, to secure the minimum required tire internal pressure for a certain period of time, and to guarantee the minimum required running.

The function of sealing the scratches of the particles B41 will be described. The first function is that the particle size of the particles B41 is at least 50 μm or more, preferably 80 μm or more. Generally, the size of the scratch hole when a foreign object such as a nail is stabbed and detached by the subsequent traveling is about 2 to 3 mm. On the other hand, 200-400 kP
When the particles under the pressure of a are to be discharged through a hole of about 2 to 3 mm, it can be easily discharged if the diameter of the particles is less than 50 μm, but if the diameter exceeds 50 μm, consolidation starts gradually and the diameter becomes smaller. With 80 μm particles, the scratches can be roughly sealed by easily consolidating. Furthermore, the air bubble-containing particles A31 existing around the wound are
By filling the small gap due to the compaction of the particles B41, the scratch hole can be completely sealed.

The second function is that the particles B41 include a polymer having fluidity and adhesiveness at room temperature.
In the above description, the existence of the particles B41 on the innermost surface of the tire due to the large specific gravity is explained. However, the tire is damaged by foreign matter piercing, etc., and then the foreign matter is run while remaining in the tire. When a large number of repeated frictions are generated on the contact surface between the tire and the tire, the particles B41, which are often present on the innermost surface of the tire, are taken into the gap generated between the foreign matter and the tire, and a large friction heat is generated on the contact surface between the foreign matter and the tire. Shearing input will be received. Therefore, the particle B41 is cracked or melted by frictional heat or shearing input, and the polymer contained therein flows out of the particle B41. The polymer that has flowed out has fluidity and adhesiveness at room temperature, and therefore takes in the bubble-containing particles A31 and particles B41 existing in the peripheral portion of the wound hole to form a plurality of particle aggregates. Since this particle aggregate is an aggregate, its volume is significantly larger than that of one particle. Therefore, when the foreign matter is suddenly detached, the particle aggregate is pushed into the scratches by the pressure inside the tire, and the scratches can be reliably sealed.

Here, in order to advantageously carry out the low internal pressure running after the tire is damaged, it is preferable to fill the inside of the tire with air bubble-containing particles A31 having a true specific gravity of 0.05 or less.
This is because if the true specific gravity is too large, the inner diameter becomes small relative to the outer diameter of the particles, that is, the shell (outer shell) thickness becomes thicker, and such particles have poor elasticity, so the internal pressure inside the tire is usually low. Lower compression degree. Therefore,
Depending on the volume filling rate of the particle composition, since the void volume surrounding the particle composition is relatively small, the mobility of the particle composition cannot be secured, and the self-balancing function may not be sufficiently exerted. . Further, from the viewpoint of self-sealing property, even if the bubble-containing particles enter the inside of the scratches on the inner surface of the tire immediately after the damage, since the degree of recovery corresponding to the decrease in the internal pressure is small, the sealing ability of the damaged part is deteriorated. There is a risk that

On the other hand, when the true specific gravity of the bubble-containing particles A31 is set to 0.05 or less, it is extremely elastic as compared with the particles having the true specific gravity of more than 0.05, and is in a state of being largely compressed under normal internal pressure. It has become. Therefore, since the void volume surrounding the particle composition is relatively large, the mobility of the particle composition can be ensured and the self-balancing function can be sufficiently exerted. Further, when the air bubble-containing particles enter the inside of the scratch on the inner surface of the tire immediately after the injury, the air bubble-containing particles A31, which have been compressed so far, generate a recovery reaction force corresponding to the decrease in the internal pressure and expand. Therefore, the damaged portion can be more surely sealed. The true specific gravity is, for example, ASTM D2840 (1984).
It can be measured by using the Air Comparison Pycnometer (version).

Furthermore, the volume under atmospheric pressure is 5.0% by volume of the tire in order to exhibit the self-balancing function in the above-mentioned normal running and to advantageously perform the low internal pressure running after the tire is damaged. It is preferable to fill the inside of the tire with the above-mentioned bubble-containing particles A31. That is, when the tire is normally running under the internal pressure, the bubble-containing particles A31 are pressed against the inner surface of the tire by the centrifugal force generated by the rotation of the tire, and are arranged in a layer having a certain thickness. . Moreover, since the magnitude of the centrifugal force depends on the distance from the tire center (corresponding to the tire radial direction), the inner surface of the tread center with the longest distance is the largest than the inner surface of the side portion with the short distance. It can be said to be the part that receives centrifugal force. During normal running, the position where the tire is damaged by stepping on a sharp foreign object, etc., is the entire tread inner surface from the inner surface of one shoulder portion to the inner surface of the other shoulder portion in the width direction of the tire. In the above, it is ideal that the bubble-containing particles A31 are arranged in layers over the entire inner surface of the tread. on the other hand,
On the inner surface of the ground contact portion during rolling, the bubble-containing particles A31 are shortened by the amount of bending of the distance due to bending of the tire,
The magnitude of the centrifugal force changes and the layered arrangement of the bubble-containing particles A31 is disturbed, and a part of the bubble-containing particles A31 always moves during rolling of the tire. Therefore, in the process of decreasing the internal pressure after the tire is damaged by foreign matter,
From the balance of the volume amount of the bubble-containing particles A31 required to achieve the sealing of the damaged portion while the vehicle can run and the volume filling rate at which the self-balancing function described above is expressed, it is 5.0 with respect to the tire inner volume. It is preferably at least volume%.

Further, it is preferable to fill the inside of the tire with particles B41 having a volume under atmospheric pressure of 0.1% by volume or more of the inner volume of the tire. That is, the dislocation and movement of the bubble-containing particles A31 due to the fluctuation of the centrifugal force received in the tire also occur in the particles B41. Therefore, it was found from the balance between the above-mentioned volume filling rate at which the self-balancing function is exhibited and the volume filling rate at which the self-sealing function is exhibited while the tire is in a process of decreasing the internal pressure after the tire is damaged. On the premise of the sealing effect in volume%, the volume of particles B41 necessary to further enhance the sealing effect by further adding particles B41 is 0.1 volume% or more with respect to the tire internal volume. Is preferred.

In this case, it is preferable that the polymer contained in the particles B41 has fluidity and adhesiveness at room temperature (25 ° C.). That is, although a normal tire filled with an internal pressure has an internal temperature that rarely exceeds 100 ° C., depending on environmental conditions, foreign matter such as nails pierces even under an environment of −20 ° C., for example. When traveling in this state, the temperature around the remaining foreign matter locally rises to about 100 ° C. The polymer is not particularly limited as long as it has fluidity and adhesiveness at room temperature (25 ° C.), and examples thereof include liquid butyl rubber (LIQ-IIR) and liquid styrene butadiene rubber (LIQ-SBR). , Liquid isoprene rubber (LIQ-IR), liquid butadiene rubber (LIQ-B)
Liquid rubbers such as R) are preferred.

Further, it is preferable that the shell enclosing the polymer is formed of at least one selected from a polyacrylonitrile polymer, a polyacrylic polymer and a polyvinylidene chloride polymer. In this case, as the polyacrylonitrile-based polymer, the polyacrylic-based polymer, and the polyvinylidene chloride-based polymer, those similar to the bubble-containing particles A described later can be used.

Therefore, under any environmental conditions, considering the proper temperature setting for allowing the polymer to flow out to form the particle aggregates and surely seal the scratches, the fluidity at least at room temperature level is obtained. If the adhesiveness is secured, the function can be exerted by utilizing the temperature rise during traveling.

The particle size of the particles B41 containing the polymer is preferably about 1 to 200 μm. The reason is that if the particle size is less than 1 μm, the effect is small from the viewpoint of particle aggregate formation because the particle volume is small no matter how much the polymer contained therein is allowed to flow out, while if it exceeds 200 μm, the contact surface between the foreign matter and the tire is small. This is because it is hard to get in.

On the other hand, in the case of particles B41 that do not contain a polymer (for example, an inorganic material), it is necessary to compact the scratches by the particles B41 themselves in a short time after the foreign matter is detached. Therefore, the diameter is preferably 50 μm or more, more preferably 80 μm or more. Examples of such an inorganic material include aluminosilicate, soda lime, and silicate glass, and one of these may be used alone or two or more thereof may be used in combination.

The above effects can be obtained by disposing the particle composition 3 having a predetermined true specific gravity inside the tire.
It is not necessary to regulate the tire structure itself, a general-purpose tire,
Then, a general-purpose rim can be utilized to newly provide a tire-rim assembly.

Here, after the air bubble-containing particles A31 and particles B41 having the true specific gravity are arranged inside the tire, the pressure at 25 ° C. inside the tire is 150 kPa in absolute pressure.
It is preferable to set it to 900 kPa or less. That is, when the pressure is less than 150 kPa, the void pressure around the particle composition inside the tire becomes small, so that the basic performance as a so-called pneumatic tire becomes poor, and after the tire is damaged, if the internal pressure is low, the damage caused by the particle composition is damaged. There is a possibility that the sealing function of the part cannot be utilized. On the other hand, when it exceeds 900 kPa, when the particle composition 3 is the bubble-containing particles A31, a part of the bubble-containing particles A31 is completely crushed by the compression, and at this time, a part of the bubble-containing particles A31 is destroyed. Will end up. Therefore, when the tire internal pressure decreases due to tire damage, the function of instantly sealing the damaged portion may not be guaranteed.

Further, in order to develop and maintain a reliable wound hole sealing by the bubble-containing particles A31 and B41 in a low internal pressure state after the tire is damaged, the bubble-containing particles A3 are used.
It is important that the gas enclosed in the single closed bubble at a predetermined pressure does not easily leak to the outside of the bubble-containing particles A31.
In other words, the outer shell forming the bubble-containing particles A31 is
It is preferable that the continuous phase has a property of hardly permeating a gas. That is, the continuous phase which is the outer shell of the bubble-containing particles A31 is preferably made of a material having low gas permeability.

Specifically, the closed cells of the bubble-containing particles A31 and the resin shell enclosing the bubbles in a closed state are a polyvinyl alcohol resin, an acrylonitrile-based copolymer,
Acrylic copolymer, vinylidene chloride copolymer, acrylonitrile / styrene resin (AS), polyethylene resin (PE), polypropylene resin (PP), polyester resin (PET) and polystyrene / polyethylene copolymer (PS / PE) It is preferable that at least one of the above is used.

Among these, it is preferable to apply any one of a polyvinyl alcohol resin, an acrylonitrile polymer, an acrylic polymer and a vinylidene chloride polymer to the continuous phase which becomes the outer shell of the bubble-containing particles A31.

As the acrylonitrile polymer,
For example, acrylonitrile polymer (AN), acrylonitrile / methacrylonitrile copolymer (AN / MA
N), acrylonitrile / methyl methacrylate copolymer (AN / MMA) and acrylonitrile / methacrylonitrile / methyl methacrylate (AN / MAN / M)
MA) at least one selected from terpolymers.

Examples of the acrylic polymer include:
Methyl methacrylate resin (MMA), methyl methacrylate / acrylonitrile copolymer (MMA / AN),
Methyl methacrylate / methacrylonitrile copolymer (MMA / MAN) and methyl methacrylate / acrylonitrile / methacrylonitrile terpolymer (MM
A / AN / MAN).

Examples of the vinylidene chloride-based polymer include vinylidene chloride / acrylonitrile copolymers, vinylidene chloride / methyl methacrylate copolymers, vinylidene chloride / methacrylonitrile copolymers, vinylidene chloride / acrylonitrile / methacrylonitrile copolymers. , Vinylidene chloride / acrylonitrile / methyl methacrylate copolymer, vinylidene chloride / methacrylonitrile / methyl methacrylate copolymer, and vinylidene chloride / acrylonitrile / methacrylonitrile / methyl methacrylate copolymer. Since all of these materials have a low gas permeability coefficient and a low gas permeability, the gas in the closed bubbles does not leak to the outside and the atmospheric pressure in the closed bubbles can be maintained.

Further, the continuous phase which is the outer shell of the bubble-containing particles A31 has a gas permeability coefficient of 300 × 10 at 30 ° C.
The gas permeability coefficient at ⁻¹² (cc · cm / cm ² · s · cmHg) or less, preferably at 30 ° C. is 20 × 10.
The gas permeability coefficient at ⁻¹² (cc · cm / cm ² · s · cmHg) or less, more preferably at 30 ° C. is 2 × 10.
It is recommended to be ⁻¹² (cc · cm / cm ² · s · cmHg) or less. Because the gas permeability coefficient of the inner liner layer in a normal pneumatic tire is 300.
Considering the track record of having a sufficient internal pressure holding function at a level of × 10 ⁻¹² (cc · cm / cm ² · s · cmHg) or less, the continuous phase which becomes the outer shell of the bubble-containing particles A31 also Gas permeability coefficient at 30 ℃ is 300 × 10
^{It was set to −12} (cc · cm / cm ² · s · cmHg) or less. However, at this gas permeation coefficient level, it is necessary to replenish the internal pressure about once every 3 to 6 months. Therefore, from the viewpoint of maintainability, the pressure is 20 × 10 ⁻¹² (cc · cm / c).
m ² · s · cmHg) or less, more preferably 2 × 10
It is recommended to be ⁻¹² (cc · cm / cm ² · s · cmHg) or less.

As the gas forming the closed cells of the bubble-containing particles A31, nitrogen, air, linear and branched aliphatic hydrocarbons having 2 to 8 carbon atoms and fluorinated compounds thereof, and 2 to 8 carbon atoms are used. Alicyclic hydrocarbon and its fluorinated compound, and the following general formula (I): R ¹ —O—R ² ---- (I) (wherein R ¹ and R ² are each independently a carbon number. Is 1
At least 1 selected from the group consisting of a monovalent hydrocarbon group of 5 to 5 and some of the hydrogen atoms of the hydrocarbon group may be replaced with fluorine atoms). Seed. The gas filled in the tire may be air, but when the gas in the particles is not a fluorinated product, a gas containing no oxygen, such as nitrogen or an inert gas, is preferable in terms of safety.

Bubble-containing particles A3 having closed cells
The method for setting No. 1 is not particularly limited, but it is preferable to use a foaming agent. Examples of the foaming agent include a thermally decomposable foaming agent that generates a gas by thermal decomposition, a high-pressure compressed gas and a liquefied gas. In this case, in particular, many of the thermally decomposable foaming agents are characterized by generating nitrogen, and the bubble gas of the bubble-containing particles A31 obtained by appropriately controlling the reaction and the foaming gas in the thermally expandable particles are It will have nitrogen in the bubbles.

Further, in the resin continuous phase polymerization for forming the bubble-containing particles A31, propane, butane, pentane, cyclopropane, cyclobutane, cyclopentane, under high pressure,
There is also a method of liquefying hexane, heptane, octane, etc., and dispersing them in a reaction solvent, and carrying out emulsion polymerization, whereby gas components such as propane, butane, pentane, cyclopropane, cyclobutane, cyclopentane, hexane, heptane, octane, etc. It is possible to obtain expandable resin particles in which the above resin continuous phase is contained in a liquid state. The bubble-containing particles A31 are obtained by previously heat-foaming the expandable resin particles and may be filled in the tire or heat-foamed in the tire.

When the expandable resin particles are heated and foamed in the tire, the surface of the expandable resin particles may be coated with a surface active agent, an oil agent or the like in advance to obtain the desired tire. Can be obtained with high productivity.
Further, the resin particles containing the liquefied gas are heated and foamed in advance to obtain substantially spherical shaped bubble-containing particles A31. When the bubble-containing particles A31 are arranged in a tire, a method of blending the particles B41 with the bubble-containing particles A31 is used. You can choose.

On the other hand, a tire usually has an inner liner layer on its inner peripheral surface. The inner liner layer comprises a nylon resin having a melting point of 170 to 230 ° C. and a halogen of isobutylene paramethylstyrene copolymer. It is preferable that the thermoplastic elastomer composition is formed by dynamically vulcanizing an elastomer component containing a compound to a gelation rate of 50 to 95% by volume. This is because, unlike the conventional inner liner layer mainly composed of butyl rubber, by using a nylon resin as the continuous phase, the gas permeability becomes extremely low, so that the function of the inner liner layer can be enhanced. On the other hand, the gelling ratio of the elastomer component containing the halide of isobutylene paramethylstyrene copolymer is 50 to 50
When the thermoplastic elastomer composition is dynamically vulcanized to 95% by volume, an inner liner layer having excellent flexibility, heat resistance and durability can be obtained. And
By the inner liner layer having the above characteristics,
It is possible to create an environment that makes it easy for the gas in the closed bubbles of the bubble-containing particles to continue to stay in the bubbles.

The gelation ratio means that the pelletized mixture after biaxial kneading is Soxhlet extracted with acetone for 8 hours in a water bath, and the residue is Soxhlet extracted with n-hexane for 8 hours. By extracting the unvulcanized elastomer component with a solvent, acetone and n-
It is a value calculated by measuring the mass of the hexane extract after solvent drying and using the following formula. Gelation rate (volume%) = [mass of total formulation − {(acetone extraction amount + n-hexane extraction amount) −stearic acid amount}] /
Mass of all compound x 100

[0080] Further, the inner liner layer, the gas permeability coefficient at 30 ° C. is ^{20 × 10 -1 2 (cc ·} cm / c
It is preferably m ² · s · cmHg) or less. This is because even if the gas in the bubbles leaks out of the bubble-containing particles A31 for some reason, if the gas permeability of the inner liner layer is sufficiently low, the gas in the bubbles in the bubble-containing particles A31 may be the tire. This is because there is less leakage to the outside of the tire, which is advantageous in maintaining the internal pressure of the tire. That is, the gas permeability of the inner liner layer is a factor that directly determines the pressure retention of the tire as a pressure vessel. Of course, bubble-containing particles A
Basically, the continuous phase forming 31 has a low gas permeability, and on top of that, it is ideal to use an inner liner layer having a low gas permeability.

The size, shape and structure of the tire-rim assembly of the present invention are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include tires for passenger cars and tires for trucks. It can be suitably used for an assembly of a rim and a tire selected from tires for buses, tires for motorcycles, tires for bicycles, tires for construction vehicles and tires for aircraft.

[0082]

EXAMPLES The present invention will be described in more detail below by showing Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Examples 1 to 15 and Comparative Examples 1 and 2] To the tires having the structures shown in FIG. 1, the particle compositions of various specifications shown in Tables 1 and 2 were applied as shown in the same table, and the size was measured. 5.5J
Tire and rim assembly for passenger car of size 185 / 70R14 built in rim of x14, and size 750x2
A prototype of a tire and rim assembly for trucks and buses with a size of 11R22.5 built into a 2.5 rim was prototyped. Here, the tire 1 complies with a general structure of the tire type and size. The types and contents of the particle compositions in Tables 1 and 2 are shown in Tables 3 and 4.

Regarding the obtained tire-rim assembly,
Various performances were evaluated by the following methods. The results of the tire / rim assembly for passenger cars are shown in Table 1, and the results of the tire / rim assembly for trucks and buses are shown in Table 2.

A sensor for monitoring the internal pressure is installed on the inner surface of the rim of the tire and rim assembly to be evaluated, and the measured internal pressure data signal is transmitted by radio waves using a generally used telemeter, The change in internal pressure was measured while receiving with a receiver installed outside the test equipment.

<Evaluation of Noise, Vibration and Riding Comfort in Actual Vehicle Test>
The obtained tire-rim assembly was filled with 300 kPa of nitrogen and mounted on a 2000 cc class passenger car. First,
Vibration and riding comfort under normal internal pressure were evaluated by a professional driver on a 10-point scale. The evaluation result shows that the higher the score, the better.

-Passenger car tire and rim assembly- <Performance evaluation after tire damage (drum test)> The obtained passenger car tire and rim assembly was filled with nitrogen gas and the internal pressure was 300 kPa in absolute pressure. After adjusting to, diameter 5.0m
Ten nails of m and 50 mm in length were driven from the tread surface toward the inside of the tire until they penetrated. Then, the drum running was started at a speed of 90 km / h while applying a load of 4.18 kN while the nail was still being driven into the tire, and the elapsed time immediately after the start and the tire internal pressure were measured. That is, 90 km continuously until the internal pressure decreases by 50 kPa or more compared to the starting level of 300 kPa.
The internal pressure was measured while traveling at / h, the test was stopped when the pressure reached 250 kPa, and the traveling distances were compared. Furthermore,
At 250 kPa, the drum was stopped, and after the number of remaining nails was counted, the traces of the nails that had come off were observed, the degree of sealing was evaluated, and the cause of the decrease in internal pressure was analyzed. <Drum running distance after the internal pressure reaches atmospheric pressure> Next, the tire is left stationary until the internal pressure is completely released to atmospheric pressure, and from that state, 90 km while applying a load of 4.18 kN
The drum running was started at a speed of / h, running up to 300 km, and passing 200 km or more.

-Truck and bus tire-rim assembly- <Performance evaluation after tire damage (drum test)> The obtained truck-bus tire-rim assembly had an internal pressure of 800 kPa in absolute pressure. , Diameter: 5 mm and length: 8 cm, the load was 26.46 kN, the speed was 60 km / h, and the internal pressure when the test was stopped was 500 kPa. <Drum travel distance after the internal pressure reaches atmospheric pressure> Further, in the drum travel after the internal pressure is atmospheric pressure, the load is 26.
A running test was conducted at 46 kN and a speed of 60 km / h.
A pass of 40 km / h or higher was determined.

[0089]

[Table 1] Passenger car tire and rim assembly (* 1) Tire internal volume: 24 liters, size: 185
/ 70R14, rim: 5.5J-14 (* 2) After arranging the particle composition in the tire, nitrogen gas was filled into the tire to adjust the internal pressure. (* 3) The internal pressure was monitored by running the drum with the nail inserted. (* 4) Sealing property of flaws with missing nails "Complete": The flaws with missing nails are completely blocked by the composition of air bubble-containing particles A and particles B, and it is extremely slow even immediately before the drum stops. And since the internal pressure is only decreasing, it is possible to drive further. “Incomplete”: The wound hole from which the nail was pulled is not completely closed and the internal pressure gradually decreases, but the amount of decrease in the internal pressure immediately before the drum stops is particularly large. Further, since the sealing of the nail pull-out portion is incomplete, no further additional running can be expected.

[0090]

[Table 2] Assembly of truck and bus tires and rims (* 1) Tire internal volume: 120 liters, size: 11
R22.5, rim: 750 × 22.5 (* 2) After arranging the particle composition in the tire, nitrogen gas was filled into the tire to adjust the internal pressure. (* 3) The internal pressure was monitored by running the drum with the nail inserted. (* 4) Sealing property of flaws with missing nails "Complete": The flaws with missing nails are completely blocked by the composition of air bubble-containing particles A and particles B, and it is extremely slow even immediately before the drum stops. And since the internal pressure is only decreasing, it is possible to drive further. “Incomplete”: The wound hole from which the nail was pulled is not completely closed and the internal pressure gradually decreases, but the amount of decrease in the internal pressure immediately before the drum stops is particularly large. Further, since the sealing of the nail pull-out portion is incomplete, no further additional running can be expected.

[0091]

[Table 3] Types and contents of bubble-containing particles A

[0092]

[Table 4] Types and contents of particles B

[0093]

According to the present invention, the true specific gravity is 0.01 or more and the volume filling rate is 5.0% by volume or more and 100% by volume.
By arranging the particle composition in the following range and having a mass of 20 g or more in the tire, durability and riding comfort are sacrificed particularly in normal running in which the tire is not damaged. Without being able to prevent a critical situation without fail by suppressing a sudden decrease in tire pressure after being injured, it is possible to increase the distance that can be traveled after being injured. It is possible to provide a tire-rim assembly having excellent self-sealing property and self-balancing property.

[Brief description of drawings]

FIG. 1 is a sectional view in a tire width direction showing a tire-rim assembly according to an embodiment of the present invention.

[Explanation of symbols]

1 tire 2 rims 3 Particle composition 31 Bubble-containing particles A 41 Particle B 5 bead part 6 carcass 7 belt 8 treads 8a cap tread 8b base tray 9 Inner liner layer 10 gas

Claims (20)

[Claims] 1. A hollow donut-shaped tire is mounted on an applicable rim, and the true specific gravity is 0.01 or more inside a tire partitioned by the tire and the applicable rim, and is defined by the following formula (1). It has a self-sealing property and a self-balancing property, which is characterized in that a particle composition having a volume filling rate of 5.0% by volume or more and 100% by volume or less and a mass of 20 g or more is arranged. Tire-rim assembly. Volume filling rate = (Vs / Vt) × 100 (1) [where Vs is the volume (liter) of the particle composition disposed inside the tire under atmospheric pressure, and Vs is the volume around the particles] It shall include void volume. Vt represents the internal volume (liter) of the tire-rim assembly. ] 2. The volume filling rate defined by the above formula (1) is in the range of 10.0% by volume or more and 100% by volume or less,
The tire-rim assembly according to claim 1, further comprising a particle composition having a mass of 50 grams or more. 3. The volume filling rate defined by the above formula (1) is in the range of 20.0% by volume or more and 100% by volume or less,
The tire-rim assembly according to claim 1 or 2, further comprising a particle composition having a mass of 100 grams or more. 4. The volume filling rate defined by the above formula (1) is in the range of 75.0% by volume or more and 100% by volume or less,
The tire-rim assembly according to any one of claims 1 to 3, further comprising a particle composition having a mass of 200 g or more. 5. The particle composition comprises particles A and particles B, the particles A being substantially spherical bubble-containing particles having a true specific gravity of 0.05 or less, and the particles B having a true specific gravity of the particles A. The tire-rim assembly according to any one of claims 1 to 4, which has a true specific gravity of 2 times or more. 6. The tire according to claim 5, wherein particles A having a volume filling rate defined by the following formula (1) are 5.0 vol% or more and particles B are 0.1 vol% or more. -Rim assembly. Volume filling rate = (Vs / Vt) × 100 (1) [where Vs is the volume (liter) of each particle placed inside the tire under atmospheric pressure, and Vs is the void around the particle] It shall include the volume. Vt represents the internal volume (liter) of the tire-rim assembly. ] 7. The particle A comprises closed cells and a resin shell that encloses the cells in a closed state, and the resin is a polyvinyl alcohol resin, a polyacrylonitrile polymer, a polyacrylic polymer, or a polyvinylidene chloride system. 7. The composition according to claim 5, which is formed of at least one kind selected from polymers.
The tire-rim assembly described. 8. The gas in the closed bubbles contained in the particles A is
Nitrogen, air, linear and branched aliphatic hydrocarbons having 2 to 8 carbon atoms and their fluorinated products, alicyclic hydrocarbons having 2 to 8 carbon atoms and their fluorinated products, and the following general formula (I) R ¹ —O—R ² ---- (I) (R ¹ and R ² in the formula each independently have 1 carbon atom.
At least 1 selected from the group consisting of a monovalent hydrocarbon group of 5 to 5 and some of the hydrogen atoms of the hydrocarbon group may be replaced with fluorine atoms). The tire-rim assembly according to any one of claims 5 to 7, which is a type. 9. A gas of 2 in a closed cell contained in a particle A.
The tire-rim assembly according to claim 5, wherein the internal pressure at 5 ° C. is 150 kPa or more in absolute pressure. 10. The closed cells contained in the particles A at 25 ° C.
10. The tire-rim assembly according to claim 9, wherein the internal pressure is 200 kPa or more in absolute pressure. 11. A resin shell of particles A has a gas permeability coefficient of 300 × 10 ⁻¹² (cc · cm / cm ²⁾ at 30 ° C.
-S-cmHg) or less, The tire-rim assembly according to any one of claims 5 to 10. 12. The tire-rim assembly according to claim 5, wherein the particles B are substantially spherical particles having a true specific gravity of 0.1 or more. 13. The particle B is made of an inorganic material.
A tire-rim assembly according to any one of claims 1 to 12. 14. The tire-rim assembly according to claim 5, wherein the particle B is a particle having a diameter of 80 μm or more. 15. The tire-rim assembly according to claim 14, wherein the particle B is a particle having a diameter of 100 μm or more. 16. The particle B has a true specific gravity of 25 or more, which is 0.1 or more.
The tire-rim assembly according to any one of claims 5 to 11, wherein the particles are particles encapsulating a polymer having fluidity and adhesiveness at a temperature of ° C. 17. The tire-rim assembly according to claim 16, wherein the polymer is made of liquid rubber. 18. The tire according to claim 16, wherein the shell enclosing the polymer is formed of at least one selected from a polyacrylonitrile polymer, a polyacrylic polymer and a polyvinylidene chloride polymer. -Rim assembly. 19. The particle B according to claim 5, which is a mixture of the particle according to any one of claims 12 to 15 and the particle according to any one of claims 16 to 18. The tire-rim assembly according to item 1. 20. A passenger car tire, a truck tire,
20. An assembly of a rim and any one of a bus tire, a motorcycle tire, a bicycle tire, a construction vehicle tire and an aircraft tire.
The tire-rim assembly according to the item.