KR102026216B1 - A pneumatic run-flat tire - Google Patents

Abstract

The present invention relates to a runflat pneumatic tire, and more particularly, to a runflat pneumatic tire capable of securing sufficient hardness in an accident without impairing driving performance. Thus, the present invention is composed of the tread portion 100, the side wall portion 200 and the bead portion 300, the reinforcement portion 600 between the carcass 400 and the inner liner 500 of the side wall portion 200 In the run-flat pneumatic tire, in which the reinforcement part 600 is installed, the reinforcement part 600 is divided into two or more space parts by the partition wall 630, and the two space parts include the first liquid receiving part 610 of the two-component adhesive. And, provides a run-flat pneumatic tire, characterized in that consisting of the second liquid receiving portion 620 of the two-component adhesive.

Description

Runflat Pneumatic Tire {A PNEUMATIC RUN-FLAT TIRE}

The present invention relates to a run-flat pneumatic tire, and more particularly, to a run-flat pneumatic tire that can secure sufficient hardness in an accident without impairing driving performance.

Runflat Tires or Self Supporting Tires provide basic tire performance in vehicles in flat situations where the tires are damaged, driving at a distance of at least 80 km at a speed of 80 km / h. It is an applied pneumatic tire with a tire structure that ensures that it is possible. As shown in FIG. 1, a general run flat tire has been developed in a direction that guarantees zero-pressure performance by using a sidewall insert rubber (SIR). The problem is that the structural characteristics of the sidewall insert rubber (SIR) adversely affect the running performance of the tire. This is a structural limitation of run-flat tires. In the case of puncture, a rigid sidewall insert rubber is advantageous in performance, but in general driving, a rigid sidewall insert rubber adversely affects the tire performance.

Therefore, in the past, run-flat tires used soft compounds in thick sidewall insert rubbers. However, this increases the weight of the tire, and consequently, the structure is disadvantageous to the running performance of the tire. Therefore, in recent years, the technology has been developed in the direction of taking a thin sidewall insert rubber structure using a hard compound. However, the compound of the hard sidewall insert rubber still had the disadvantage of deteriorating the tire performance. Therefore, it is necessary to develop a technology that can guarantee the same driving performance as normal tires in normal driving, and improve hardness in an accident.

Hereinafter, the prior art related to the run flat tire will be described. Identification symbols of the following prior arts are not relevant to the present invention.

Republic of Korea Patent No. 10-0935999 'Rubber composition for reinforcing the sidewall of the run-flat tire' relates to a rubber composition for reinforcing the sidewall of the run-flat tire, more specifically, natural rubber, rubber-resin composite vinyl- It is composed of raw rubber made of sheath rubber (VCR) and nano reinforcement resin containing modified phenol formaldehyde resin, so that rubber composition for reinforcing sidewall of run flat tires with improved modulus and heat generation characteristics It is about. No. 10-0935999 discloses a phenol modified with cashew nut shell liquid based on 100 parts by weight of raw rubber consisting of 20 to 80% by weight of natural rubber and 20 to 80% by weight of vinyl-cis rubber as a rubber-resin composite. Disclosed is a rubber composition for reinforcing sidewalls of a run flat tire comprising 0.5 to 10 parts by weight of a nano-reinforcement resin containing formaldehyde resin, 30 to 60 parts by weight of carbon black, and 10 to 50 parts by weight of silica. .

Republic of Korea Patent No. 10-1680409 'Run flat tire' relates to a run flat tire that can improve run flat durability, the bead core of the bead portion 4 through the tread portion (2) through the side wall portion (3) The carcass 6 which reaches (5) and the side reinforcement rubber layer 9 of the crescent-shaped cross section arrange | positioned inside the carcass 6 in the said side wall part 3 are provided. The thermally conductive rubber 11 having a thermal conductivity of 0.3 W / (m · K) or more is disposed on the tire inner surface 12. At least a part of the thermally conductive rubber 11 is disposed in the side reinforcement rubber layer projection region T in which the side reinforcement rubber layer 9 is projected onto the tire inner lumen 12. Such a thermally conductive rubber can absorb the heat of the side reinforcement rubber layer that generates heat during run flat travel, and can escape to the tire cavity. Therefore, run flat durability can be improved significantly.

Republic of Korea Patent No. 10-0935999 'Rubber composition for reinforcing sidewalls of run flat tires' (announcement date 11 Jan 2010) Republic of Korea Patent No. 10-1680409 'Run Flat Tire' (Notice date 28 November 2016)

The technical problem to be achieved by the present invention is to provide a run-flat pneumatic tire that satisfies the running performance and load bearing performance when the tire is damaged.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

In order to achieve the above technical problem, one embodiment of the present invention is composed of a tread portion 100, the side wall portion 200 and the bead portion 300, the carcass 400 and the inner of the side wall portion 200 In the run-flat pneumatic tire in which the reinforcement part 600 is installed between the liner 500, the reinforcement part 600 is divided into two or more space parts by the partition wall 630, and the two space parts are two-part type. Provided is a run flat pneumatic tire composed of a first liquid container 610 of an adhesive and a second liquid container 620 of a two-component adhesive.

According to the embodiment of the present invention, since the two-component adhesive is divided into each space part by the partition wall and is not cured when driving in a general situation, the hardness of the sidewall is the same as that of the general tire. You can expect the equivalent running performance.

However, when the tire is damaged, the partition wall is ruptured, and the first agent and the second agent of the two-component adhesives stored in the respective space portions are mixed and cured. As the two-component adhesive housed in the sidewall is cured, the rigidity of the sidewall is increased to allow the flat tire to run. In addition, it is also possible to expect the effect of improving the travel distance by filling the rupture portion while curing the two-component adhesive to reduce the speed of air escape.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a cross-sectional view of the main portion of the run flat tire to which a conventional sidewall insert rubber (SIR; sidewall insert rubber) is applied.
Figure 2 is a sectional view of the main portion of the run-flat pneumatic tire of the present invention.
Fig. 3 is an exploded sectional view of the main portion illustrating a state in which the partition wall for dividing the reinforcing portion of the run flat pneumatic tire of the present invention is broken.
Figure 4 is an excerpt sectional view of the main portion of the embodiment to which two or more partitions are applied as another embodiment of the run-flat pneumatic tire of the present invention.
Figure 5 is a cross-sectional view of the main portion of the embodiment to which the projection for rupturing the partition wall as another embodiment of the run-flat pneumatic tire of the present invention.
Figure 6 is a table summarizing the results of measuring the Mooney viscosity, hardness, 300% modulus, viscoelasticity and the like of the present invention in accordance with ASTM-related regulations.

Hereinafter, with reference to the accompanying drawings will be described the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member in between. "Includes the case. In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is composed of a tread portion 100, the side wall portion 200 and the bead portion 300, the reinforcement portion 600 between the carcass 400 and the inner liner 500 of the side wall portion 200 In the installed run-flat pneumatic tire, the reinforcement portion 600 is divided into two or more space portions by the partition wall 630, the two space portions and the first liquid receiving portion 610 of the two-component adhesive, Provided is a run flat pneumatic tire composed of a second liquid container 620 of a two-component adhesive.

According to the above configuration, when the tire is damaged while the vehicle is running, the partition 130 is damaged and accommodated in the first liquid receiving part 610 and the second liquid receiving part 620 formed by the partition wall 630. The first liquid and the second liquid of the two-component adhesive are mixed with each other to coagulate, and the effect of realizing a function of the sidewall insert rubber (SIR) of the prior art can be expected. That is, as the first liquid and the second liquid are mixed and hardened, the stiffness is increased and the sidewall insert rubber which supports the load of the vehicle body is implemented.

In addition, in the case of a two-component adhesive in response to a short time at room temperature to harden the corresponding area to improve the strength (stiffness), and thus can be expected to delay the phenomenon that the destruction of the tire. In other words, once destruction starts to develop, it is possible to suppress the progress of the destruction at a high speed, thereby lowering the rate of decrease of the inflation pressure of the tire, thereby improving the running time in the zero-pressure state. .

Two-part adhesives are adhesives in which two liquids are mixed to improve mechanical properties, and typically, an epoxy resin adhesive is used. The two-component adhesives exist in a liquid state before the reaction, but the two liquids have improved adhesion, heat resistance, and electrical insulation properties.They are widely used in household, industrial, electrical, and automotive applications because they have no by-products during the reaction. .

In order for the two-component adhesive applied to the present invention to perform the function of the sidewall insert rubber, the first liquid of the two-component adhesive includes an epoxy resin, and the second liquid of the two-component adhesive includes a curing agent. .

If necessary, an inorganic filler can be added to the two-part adhesive. The inorganic filler may have a high hardness when the two-component adhesive is cured. In the embodiment in which the inorganic filler is applied, the first liquid is 35 to 52 wt% epoxy resin, 0.1 to 0.5 wt% dispersant, 45 to 60 wt% inorganic filler, 0.5 to 5 wt% reactive diluent It can have a composition of. The inorganic filler is preferably a hard calcium carbonate having an average particle size of 0.8 ~ 3.0㎛.

Preferably, the curing agent of the second liquid includes at least one selected from polyamide cured resin, MXDA (meta xylene diamine) resin, and epoxy cured resin.

The partition wall 630 dividing the reinforcing part 600 should not react with the first liquid and the second liquid of the two-part adhesive, and include rubber including natural rubber (NR), butyl rubber (BR), and carbon black. It is preferable that it is a material, and it is preferable that thickness is 2-5 mm. As shown in FIG. 2, the partition wall 630 may be configured to divide the reinforcement part 600 in the height direction of the tire, but may have a configuration of dividing the reinforcement part 600 in the circumferential direction of the tire, if necessary. It may be.

If the breakage of the tire starts slightly and the breakage grows, the partition 630 may not rupture quickly, which may slow down the reaction starting point of the two-part adhesive. To this end, in the present invention, a protrusion 640 for rupture of the partition wall 630 when the tire is punctured may be formed on the surface of the partition wall 630. The protrusion 640 may be formed at the center of the partition 630 to induce rupture from the center of the partition 630, thereby inducing uniform curing of the two-part adhesive.

Figure 6 is a table summarizing the results of measuring the Mooney viscosity, hardness, 300% modulus, viscoelasticity and the like of the present invention in accordance with ASTM-related regulations. The terms used in the table are as follows.

1) NR (Natural Rubber): STR 20%

2) BR (butadiene rubber): Butadiene rubber matrix (BR Matrix) with SPB content of 17 in VCR with pattern 60

3) C / B: Carbon black with iodine adsorption amount of 100 ~ 120 mg / g, oil absorption amount of 55 ~ 75 cc / 100g

4) Softener: Softener with softening point of 70 ~ 90 ℃

5) Liquid adhesive A: Epoxy resin

6) Liquid Adhesive B: Epoxy Hardener

7) Layer: Number of multi-layered structures with different fillers

8) H.B.U. (Heat Build -UP): Heat accumulation (heating scale of rubber)

Measurement conditions in the table of FIG. 6 are as follows.

The glass transition temperature was measured using the DSC method.

Hardness was measured according to DIN 53505

300% modulus * was measured according to ISO 37 standard.

300% modulus ** is measured according to the ISO 37 standard, and the torsion was measured after 100 repetitions at 10 hz in advance.

  * Reason for torsion: Given the runflat situation, impose harsh conditions on rubber specimens.

In the table of Figure 6 HBU is a measure of the exothermic of the rubber, in the case of Examples 1 to 3 mixed with A and B type through the membrane, the heat rises during the initial reaction, but by-products are released after the reaction and only the hardness of the rubber It was confirmed that the exothermic level dropped.

As the number of layer layers is small, that is, the number of partition walls 630 does not occur, the uniform reaction between A and B does not occur, and thus hardening is opaque, and the number of layer layers is larger, that is, the partition walls 630. As the number of more increased, the curing effect occurred with a uniform reaction, and the heat build up test result showed more favorable durability. Based on the above measurement results, as shown in FIG. 4, the configuration including multiple partition walls 630 is significant.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is represented by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention.

100: tread section
200: sidewall
300: bead part
400: carcass
500: inner liner
600: reinforcement
610: first liquid container
620: second liquid container
630: bulkhead
640: turning

Claims (10)

The tread part 100, the side wall part 200, and the bead part 300 are formed, and the reinforcement part 600 is installed between the carcass 400 and the inner liner 500 of the side wall part 200. In the flat pneumatic tire,
The reinforcement part 600 is divided into two or more space parts by the partition wall 630,
The two space portions of the run-flat pneumatic tire, characterized in that the first liquid receiving portion 610 of the two-component adhesive and the second liquid receiving portion 620 of the two-component adhesive.
The method of claim 1,
The first liquid of the two-part adhesive comprises an epoxy resin,
Run-flat pneumatic tire, characterized in that the second liquid of the two-component adhesive comprises a curing agent.
The method of claim 2,
The first liquid has a composition of 35 to 52 wt% epoxy resin, 0.1 to 0.5 wt% dispersant, 45 to 60 wt% inorganic filler, and 0.5 to 5 wt% reactive diluent. Mouth tire.
The method of claim 3,
The inorganic filler is a run-flat pneumatic tire, characterized in that the hard calcium carbonate having an average particle size of 0.8 ~ 3.0㎛.
The method of claim 2,
The curing agent of the second liquid is a run-flat pneumatic tire, characterized in that it comprises at least one selected from polyamide cured resin, MXDA (meta xylene diamine) resin and epoxy-based cured resin.
The method of claim 1,
The partition wall 630 dividing the reinforcing part 600 is a run-flat pneumatic tire, characterized in that the rubber material containing natural rubber (NR), butyl-based rubber (BR), carbon black.
The method of claim 6,
Run-flat pneumatic tire, characterized in that the thickness of the partition 630 is 2 ~ 5mm
The method of claim 1,
The partition wall 630 is a run-flat pneumatic tire, characterized in that to divide the reinforcement portion 600 in the height direction of the tire.
The method of claim 1,
The partition wall 630 is a run-flat pneumatic tire, characterized in that to divide the reinforcement portion 600 in the circumferential direction of the tire.
The method of claim 1,
Run-flat pneumatic tires, characterized in that the projection 640 for rupture of the partition wall 630 when the tire puncture on the surface of the partition wall (630) is formed.

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