CN113147271A - Pneumatic tire and puncture-preventing method thereof - Google Patents

Abstract

The invention provides a pneumatic tire and a pneumatic tire puncture-preventing method, wherein the pneumatic tire comprises a tread layer and a reinforcing layer, wherein a plurality of pattern grooves are arranged on the outer side of the tread layer, the pneumatic tire further comprises a sealing layer covering the inner side of the reinforcing layer, the sealing layer is made of a self-sealing rubber composition, the sealing layer comprises a reinforced sealing structure, and the reinforced sealing structure completely covers the inner side of the reinforcing layer and the position corresponding to the pattern grooves. By adopting the structure, when the sharp object punctures from the bottom of the groove to the interior of the pneumatic tire, the reinforced sealing structure corresponding to the groove can cover the surface of the sharp object to prevent the air pressure in the pneumatic tire from leaking; when the sharp object is pulled out or removed from the pneumatic tire, the sealing layer which strengthens the sealing structure and the periphery of the puncture hole can flow into the puncture hole, the pneumatic tire is kept sealed, the air pressure inside the pneumatic tire is prevented from leaking, and the pneumatic tire is effectively prevented from being punctured and damaged by the sharp object.

Description

Pneumatic tire and puncture-preventing method thereof

Technical Field

The invention relates to the technical field of pneumatic tires, in particular to a pneumatic tire and a puncture-preventing method of the pneumatic tire.

Background

The explosion-proof tyre is a commonly used safety tyre at present, the tyre wall of the explosion-proof tyre has the characteristics of large thickness, high hardness and the like, even if the explosion-proof tyre is punctured by a sharp object and the tyre pressure is reduced, the tyre wall with higher strength can still maintain the normal running of a vehicle, the conditions of tyre burst and the like can not occur, and the vehicle can run to a place where the tyre can be replaced. However, because the tire wall has large thickness and high hardness, the comfort of the whole vehicle is poor, and the run-flat tire can generate large noise.

In order to solve the above problems, a self-sealing rubber tire, that is, a tire in which a sealing layer made of a highly viscous rubber composition is provided in an inner liner of the tire, has been conventionally used. After the sharp object penetrates the tire tread, the high-viscosity rubber composition of the sealing layer can be coated on the surface of the sharp object to prevent air pressure leakage, and after the sharp object is removed, the high-viscosity rubber composition flows into the puncture hole by proper fluidity to keep the interior of the tire sealed, so that the puncture-preventing effect is achieved.

However, when the self-sealing rubber tire in the prior art is punctured and damaged by a sharp object from the bottom of the tire groove, the tire wound is large, the sealing layer cannot completely cover the sharp object, and the interior of the tire cannot be completely sealed after the sharp object is removed, so that the tire pressure of the tire is reduced, dangerous situations such as tire burst occur, and the personal safety of personnel in the vehicle is affected.

Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a pneumatic tire capable of coping with the puncture damage of a sharp object from the bottom of a tire groove.

Disclosure of Invention

The invention aims to provide a pneumatic tire capable of coping with puncture damage of a sharp object from the bottom of a tire groove.

In order to solve the technical problem, the invention provides a pneumatic tire which comprises a tread layer and a reinforcing layer, wherein a plurality of pattern grooves are formed in the outer side of the tread layer, the pneumatic tire further comprises a sealing layer covering the inner side of the reinforcing layer, the sealing layer is made of a self-sealing rubber composition, the sealing layer comprises a reinforced sealing structure, and the reinforced sealing structure completely covers the inner side of the reinforcing layer and the position corresponding to the pattern grooves.

By adopting the structure, when the sharp object punctures from the bottom of the groove to the interior of the pneumatic tire, the reinforced sealing structure corresponding to the groove can cover the surface of the sharp object to prevent the air pressure in the pneumatic tire from leaking; when the sharp object is pulled out or removed from the pneumatic tire, the sealing layer which strengthens the sealing structure and the periphery of the puncture hole can flow into the puncture hole, the pneumatic tire is kept sealed, the air pressure inside the pneumatic tire is prevented from leaking, and the pneumatic tire is effectively prevented from being punctured and damaged by the sharp object.

Optionally, the sealing layers have the same overall thickness, and the portions of the sealing layers corresponding to the grooves are the reinforced sealing structures, and the strength of the reinforced sealing structures is greater than that of the rest portions of the sealing layers.

Optionally, the sealing layer includes a first sealing layer and a second sealing layer that are separately disposed, the second sealing layer is the reinforced sealing structure, the second sealing layer is disposed on an inner side of the first sealing layer, and the second sealing layer and the first sealing layer are disposed in a layered manner or integrally.

Optionally, the second sealing layer extends lengthwise with the groove, the second sealing layer having a width greater than or equal to a maximum groove width of the corresponding groove.

Optionally, the first sealing layer has a thickness in a range between 1 mm and 10 mm.

Optionally, the second sealing layer has a thickness in a range between 0.5 mm and 8 mm.

Optionally, the first sealing layer and the second sealing layer are made of self-sealing rubber compositions with the same components or different components.

Optionally, the first sealing layer and the second sealing layer are respectively formed by compounding a plurality of self-sealing rubber compositions of different components.

Optionally, the second sealing layer is spliced by sealing strips with the same or different cross-sectional shapes.

A method for preventing puncture of a pneumatic tire, wherein a sealing layer made of a self-sealing rubber composition is covered on the inner side of the pneumatic tire, and the sealing layer comprises a reinforced sealing structure which completely covers the position corresponding to a groove of the pneumatic tire; when a sharp object pierces from the bottom of the groove to the inside of the pneumatic tire, the reinforcing seal structure and the seal layer can cover the sharp object to prevent air pressure inside the pneumatic tire from leaking; when the sharp object is pulled out or removed from the interior of the pneumatic tire, the reinforcing seal structure and the seal layer can flow to the puncture hole and keep the pneumatic tire sealed to prevent air pressure leakage from the interior of the pneumatic tire.

Drawings

FIG. 1 is a schematic side cross-sectional view of a pneumatic tire having four grooves provided by an embodiment of the present invention;

FIG. 2 is a side elevational cross-sectional view of the pneumatic tire of FIG. 1 with a widened second sealant layer;

FIG. 3 is a schematic side cross-sectional view of a pneumatic tire having three grooves according to an embodiment of the present invention;

FIG. 4 is a schematic partial structure view of the pneumatic tire of FIG. 1 as it is pierced by a sharp object from the bottom of the groove;

FIG. 5 is a schematic structural view of a first embodiment of a second sealant layer of the pneumatic tire of FIG. 1;

FIG. 6 is a schematic structural view of a second embodiment of a second sealant layer of the pneumatic tire of FIG. 1;

FIG. 7 is a schematic structural view of a third embodiment of the second sealant layer of the pneumatic tire of FIG. 1;

FIG. 8 is a schematic structural view of a fourth embodiment of the second sealant layer of the pneumatic tire of FIG. 1;

the reference numerals in fig. 1-8 are illustrated as follows:

1 tread layer, 11 grooves, 2 reinforcement layers, 3 sealing layers, 31 first sealing layer, 32 second sealing layer, 4 sharp object.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and 4, fig. 1 is a schematic side sectional view of a pneumatic tire with four grooves according to an embodiment of the present invention; FIG. 4 is a partial schematic view of the pneumatic tire of FIG. 1 as it is punctured by a sharp object from the bottom of the groove.

The embodiment of the invention provides a pneumatic tire, which comprises a tread layer 1 and a reinforcing layer 2, wherein a plurality of grooves 11 are arranged on the outer side of the tread layer 1, and the outer side refers to the circumferential outer side relative to the pneumatic tire. The embodiment further comprises a sealing layer 3 covering the inner side of the reinforcing layer 2, the sealing layer 3 is made of a self-sealing rubber composition, and the sealing layer 3 further comprises a reinforcing sealing structure which completely covers the position corresponding to the groove 11.

It should be noted that the self-sealing rubber composition described above has unique physical and chemical properties, sufficient ductility and fluidity, aging resistance, decomposition resistance and the like, and can maintain a good puncture-proof effect in a wide temperature range. Under the driving condition of the vehicle in summer, high temperature is generated in the tire, and the self-sealing rubber composition cannot be separated from the original position or flow; the self-sealing rubber composition can maintain good sealing performance, ductility and fluidity even if the temperature inside the tire is low under the driving condition of the vehicle in winter.

With the above structure, when the sharp object 4 pierces the pneumatic tire from the bottom of the groove 11, i.e. from the position closest to the inside of the pneumatic tire, specifically referring to fig. 4, the reinforced sealing structure corresponding to the groove 11 can completely cover the surface of the sharp object 4, so that the sharp object 4 cannot completely pierce the sealing layer 3, and the air pressure inside the pneumatic tire cannot leak;

when sharp object 4 is pulled out or is got rid of from pneumatic tire, tread layer 1 and reinforcing layer 2 just can have the puncture hole, and because sharp object 4 pierces from the bottom of tread groove 11, this puncture hole is great, strengthen sealing structure and puncture hole peripheral sealing layer 3 and can flow in the puncture hole this moment, stop up the puncture hole completely, make pneumatic tire keep sealed state, prevent the inside atmospheric pressure of pneumatic tire and leak, pneumatic tire still can normal use, effectively prevent pneumatic tire from being punctured by sharp object 4 and destroying.

The sealing layer 3 may have the same overall thickness, and the part covered on the inner side of the reinforcing layer 2 and corresponding to the groove 11 has higher strength, i.e. the part is the reinforced sealing structure, and the higher strength means that the material of the reinforced sealing structure is compared with the sealing layer 3 at other positions, and the self-sealing rubber composition with stronger strength and higher puncture resistance is selected.

The reinforced sealing structure can also be arranged on the inner side of the sealing layer 3 and is arranged in a layered manner or integrally with the sealing layer 3, the layered arrangement refers to that the reinforced sealing structure and the sealing layer 3 are separately arranged to form an independent sealing structure, and the integral arrangement refers to that the reinforced sealing structure is formed by locally thickening the inner side of the sealing layer 3. The present invention is not limited to the arrangement of the reinforcing seal structure, as long as the reinforcing seal structure is made of a self-sealing rubber composition, and the sharp object 4 can be prevented from piercing the pneumatic tire to cause air pressure leakage in the pneumatic tire.

Referring to fig. 3, fig. 3 is a schematic side sectional view of a pneumatic tire with three grooves according to an embodiment of the present invention.

In the present embodiment, the number and the arrangement positions of the reinforced sealing structures need to correspond to the grooves 11, as shown in fig. 1, if the pneumatic tire in the embodiment has four grooves 11, four reinforced sealing structures corresponding to the grooves need to be arranged; as shown in fig. 3, if the pneumatic tire in the embodiment has three grooves 11, three reinforcing seal structures corresponding thereto need to be provided; it will be understood that the pneumatic tire may have other numbers of grooves 11 or other functional recesses, and that other numbers or locations of reinforced sealing structures may be required, and the invention is not limited thereto. The groove 11 may be an annular groove extending continuously in the circumferential direction of the pneumatic tire, in this case, the reinforcing seal structure may also be provided annularly, and the groove 11 may also be a plurality of groove segments extending intermittently, in this case, the reinforcing seal structure may be provided annularly in the circumferential direction of the pneumatic tire, or may correspond to only the groove 11.

Referring to fig. 1, in the present embodiment, the sealing layer 3 may include a first sealing layer 31 and a second sealing layer 32 that are separately disposed, the first sealing layer 31 covers the inner side of the reinforcing layer 2, and the second sealing layer 32 is the reinforced sealing structure described above. The first sealant layer 31 provides puncture protection for the entire pneumatic tire, and the second sealant layer 32 provides enhanced puncture protection for the weakened locations of the pneumatic tire.

Referring to fig. 2, fig. 2 is a schematic side sectional view of the pneumatic tire of fig. 1 with a widened second sealant layer.

The second sealing layer 32 in this embodiment extends lengthwise along the groove 11, and the width of the second sealing layer 32 is greater than or equal to the maximum groove width of the corresponding groove 11. Wherein, the maximum groove width of the groove 11 is the outermost side of the tread layer 1, and the maximum distance between two groove edges of the groove 11. Specifically, as shown in fig. 1 to 3, taking a set of corresponding groove 11 and second sealing portion 32 in the pneumatic tire as an example, the labeled L is the width of the second sealing layer 32, and M is the maximum groove width of the groove 11, in fig. 1 and 3, L is equal to or slightly greater than M, that is, the width of the second sealing layer 32 is equal to or slightly greater than the maximum groove width of the groove 11; in FIG. 2L is greater or much greater than M, i.e., the width of the second sealing layer 32 is greater or much greater than the maximum groove width of the groove 11.

In practice, the second sealing layer 32 may be of a width equal to or slightly greater than the maximum groove width of the groove 11, as shown in FIG. 1, or of a width greater than or much greater than the maximum groove width of the groove 11, as shown in FIG. 2; the present invention is not limited in this regard as long as the second sealing layer 32 prevents the sharp object 4 from piercing the pneumatic tire from the bottom of the groove 11.

In the present embodiment, the thickness of the first sealing layer 31 ranges from 1 mm to 10 mm.

In this thickness range, the first sealing layer 31 has sufficient puncture-preventing properties and is low in weight. If the pneumatic tire needs to be used under severe conditions, that is, if the probability of being punctured is high and the number of times is large, the thickness of the first sealing layer 31 may be set large, for example, close to 10 mm; if the pneumatic tire is required to be used under safer conditions, that is, if the probability of being punctured is small and the number of times is small, the thickness of the first sealing layer 31 can be set small, for example, approximately 1 mm.

In this embodiment, the thickness of the second sealant 32 ranges between 0.5 mm and 8 mm.

The second sealant 32 also has sufficient puncture resistance at this thickness and is low in weight, as with the first sealant 31. If the pneumatic tire is to be used under severe conditions, i.e., if the probability of being punctured is high and the number of times is large, the thickness of the second sealant layer 32 can be set large, for example, approximately 8 mm; if the pneumatic tire is to be used under safer conditions, i.e., less likely to be punctured and less frequent, the thickness of the second sealant layer 32 can be set to be small, for example, approximately 0.5 mm.

In this embodiment, the first sealing layer 31 and the second sealing layer 32 are made of self-sealing rubber compositions having the same composition; alternatively, the first sealing layer 31 and the second sealing layer 32 are made of self-sealing rubber compositions with different components; alternatively, the first sealing layer 31 and the second sealing layer 32 are formed by compounding a plurality of self-sealing rubber compositions of different compositions.

It is understood that the materials of the first sealing layer 31 and the second sealing layer 32 are all included in the scope of the present invention as long as they are included in the self-sealing rubber composition and can perform the various functions described above.

Referring to FIGS. 5-8, FIG. 5 is a schematic structural view of a first embodiment of a second sealant layer of the pneumatic tire of FIG. 1; FIG. 6 is a schematic structural view of a second embodiment of a second sealant layer of the pneumatic tire of FIG. 1; FIG. 7 is a schematic structural view of a third embodiment of the second sealant layer of the pneumatic tire of FIG. 1; FIG. 8 is a schematic structural view of a fourth embodiment of the second sealant layer of the pneumatic tire of FIG. 1.

As shown in fig. 5-8, the second sealant layer 32 may be formed by splicing a plurality of sealing strips of the same or different cross-sectional shapes. In fig. 5, the second sealing layer 32 is a trapezoidal structure, and both the second sealing layer 32 and the first sealing layer 31 may be formed by splicing more than two sealing strip structures along the width direction of the tread, wherein the second sealing layer 32 is formed by splicing two sealing strips of a trapezoidal sealing strip and a parallelogram; in fig. 6, the first sealing layer 31 and the second sealing layer 32 are formed by overlapping and combining two or more strip-shaped sealing strip structures arranged in the tread width direction; in fig. 7, the second sealing layer 32 is formed by combining more than two same sealing strip structures which are stacked and arranged along the inner and outer directions; in fig. 8, the second sealant layer 32 has a one-bar seal configuration, which is generally oval in configuration.

It should be noted that the sealing layer 3 in the pneumatic tire is formed by spraying and solidifying the sealing layer 3 on the inner side of the reinforcing layer 2 by a spray gun, the specific shape of the sealing layer 3 is determined by the spraying position and the nozzle shape of the spray gun, and when the second sealing layer 32 is formed by combining a plurality of sealing strip structures along the tread width direction or along the inner and outer directions, that is, the sealing layer is formed by spraying a plurality of times by the spray gun in the corresponding direction, and the finally formed sealing strips have no obvious boundary line, and the structure is different from the second sealing layer 32 of other similar structures only in the forming mode, but the structure is still regarded as an embodiment different from other similar structures.

It is understood that the second sealing layer 32 may have other shapes than the above-described shapes as long as it can cover the position corresponding to the groove 11 and prevent the pneumatic tire from being punctured, and the present invention is not limited thereto.

In this embodiment, a comparative experiment is also performed on the arrangement manner of the sealing layer 3, and the comparative experiment respectively adopts two self-sealing rubber compositions, which are respectively defined as a first composition and a second composition, wherein the first composition has a lower strength and a lower puncture-proof performance, and the second composition has a higher strength and a higher puncture-proof performance.

Specifically, refer to table 1 below:

table 1: comparison of specific parameters of each group of experiments

Six punctures were made respectively to the outside of the tread layer 1 of the first to sixth groups and to the bottom of the groove 11 by the same sharp object 4, as a result, refer to the following table 2:

table 2: comparative experiment results

2/6 in Table 2 indicates that the pneumatic tire was completely sealed after two punctures and two punctures of six punctures, and 6/6 indicates that the pneumatic tire was completely sealed after six punctures and six punctures of six punctures.

As can be seen from table 2, with the pneumatic tire provided in the present embodiment, the sealing layer 3 having the reinforced sealing structure can effectively prevent the pneumatic tire from being punctured and damaged by the sharp object 4, and can maintain the pneumatic tire sealed even if the sharp object 4 punctures from the bottom of the groove 11 to the inside of the pneumatic tire; compared with the overall thickening arrangement mode, the sealing layer 3 in the embodiment has the advantages of low overall weight and light weight.

The invention also provides a puncture-preventing method for the pneumatic tire, which comprises the following specific steps:

covering the inner side of the pneumatic tire with a sealing layer 3 made of a self-sealing rubber composition, wherein the sealing layer 3 comprises a reinforced sealing structure, and the reinforced sealing structure completely covers the position corresponding to a groove 11 of the pneumatic tire;

when the sharp object 4 stabs into the pneumatic tire from the bottom of the pattern groove 11, the reinforced sealing structure and the sealing layer 3 can cover the sharp object 4 to prevent air pressure in the pneumatic tire from leaking;

when the sharp object 4 is pulled out or removed from the inside of the pneumatic tire, the reinforcing seal structure and the seal layer 3 can flow toward the puncture hole and keep the pneumatic tire sealed to prevent the air pressure inside the pneumatic tire from leaking.

By adopting the method, the pneumatic tire can be effectively prevented from being punctured and damaged by the sharp object 4. The sealing layer 3 is the above-described sealing layer 3, and since the sealing layer 3 has the above technical effects, the sealing layer 3 should have the same technical effects in the method, and thus, the description thereof is omitted.

Further, the sealing layer 3 comprises a first sealing layer 31 and a second sealing layer 32 which are arranged in a split manner, the first sealing layer 31 covers the inner side of the reinforcing layer 2, and the second sealing layer 32 is a reinforced sealing structure;

when the sharp object 4 pierces from the bottom of the groove 11 to the inside of the pneumatic tire, the first sealing layer 31 and the second sealing layer 32 can be respectively wrapped around the sharp object 4;

when the sharp object 4 is pulled out or removed from the inside of the pneumatic tire, the first sealant 31 and the second sealant 32 can flow to the puncture hole, respectively, and keep the pneumatic tire sealed.

The first sealing layer 31 and the second sealing layer 32 are the first sealing layer 31 and the second sealing layer 32 described above, and since the first sealing layer 31 and the second sealing layer 32 have the above technical effects, in the method, the first sealing layer 31 and the second sealing layer 32 should also have the same technical effects, and thus, the description thereof is omitted.

In addition, the thicknesses of the first sealing layer 31 and the second sealing layer 32 are not limited in the present embodiment, and may be freely set in practical use according to the puncture resistance required for a practical pneumatic tire.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims (10)

1. A pneumatic tire comprising a tread layer (1) and a reinforcement layer (2), said tread layer (1) being provided on the outside with a plurality of grooves (11), characterized in that: the pneumatic tire is characterized by further comprising a sealing layer (3) covering the inner side of the reinforcing layer (2), the sealing layer (3) is made of a self-sealing rubber composition, the sealing layer (3) comprises a reinforcing sealing structure, and the inner side of the reinforcing layer (2) and the position corresponding to the groove (11) are completely covered by the reinforcing sealing structure.

2. A pneumatic tire as in claim 1, wherein: the whole thickness of the sealing layer (3) is the same, the part of the sealing layer (3) corresponding to the groove (11) is the reinforced sealing structure, and the strength of the reinforced sealing structure is greater than that of the rest part of the sealing layer (3).

3. A pneumatic tire as in claim 1, wherein: the sealing layer (3) comprises a first sealing layer (31) and a second sealing layer (32) which are arranged in a split mode, the second sealing layer (32) is the reinforced sealing structure, the second sealing layer (32) is arranged on the inner side of the first sealing layer (31), and the second sealing layer (32) and the first sealing layer (31) are arranged in a layered mode or are arranged integrally.

4. A pneumatic tire as in claim 3, wherein; the second sealing layer (32) extends along the groove (11) in the length direction, and the width of the second sealing layer (32) is larger than or equal to the maximum groove width of the corresponding groove (11).

5. A pneumatic tire as in claim 3, wherein: the first sealing layer (31) has a thickness in the range of 1 mm to 10 mm.

6. A pneumatic tire as in claim 3, wherein: the second sealant layer (32) has a thickness in a range between 0.5 mm and 8 mm.

7. A pneumatic tyre as claimed in anyone of claims 3 to 6, characterized in that: the first sealing layer (31) and the second sealing layer (32) are made of self-sealing rubber compositions with the same components or different components.

8. A pneumatic tyre as claimed in anyone of claims 3 to 6, characterized in that: the first sealing layer (31) and the second sealing layer (32) are respectively formed by compounding a plurality of self-sealing rubber compositions with different components.

9. A pneumatic tyre as claimed in anyone of claims 3 to 6, characterized in that: the second sealing layer (32) is formed by splicing sealing strips with the same or different cross-sectional shapes.

10. The puncture-preventing method for the pneumatic tire is characterized in that: covering the inner side of the pneumatic tire with a sealing layer (3) made of a self-sealing rubber composition, wherein the sealing layer (3) comprises a reinforced sealing structure, and the reinforced sealing structure completely covers the inner side of the reinforcing layer (2) at a position corresponding to a groove (11) of the pneumatic tire;

when a sharp object (4) pierces from the bottom of the groove (11) to the inside of the pneumatic tire, the reinforcing sealing structure and the sealing layer (3) can cover the sharp object (4) to prevent air pressure inside the pneumatic tire from leaking;

when the sharp object (4) is pulled out or removed from the interior of the pneumatic tire, the reinforcing sealing structure and the sealing layer (3) can flow to the puncture hole, and the pneumatic tire is kept sealed, so that air pressure in the interior of the pneumatic tire is prevented from leaking.

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