JP2000038007A - Seal agent-contained tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance self-seal action against a bite in a seal agent-contained tire. SOLUTION: An inner liner 2 arranged in the inside of a tire main body 1 is integrally provided with an air chamber peripheral wall 3i, seal agent chamber peripheral wall 3o, and a partition 4, the air chamber peripheral wall 3i is bonded by vulcanization to the tire main body 1, the seal agent chamber peripheral wall 3o is prevented from bonding to the tire main body 1 by a mold releasing sheet 10. A seal agent chamber 6 partitioned between the seal agent chamber peripheral wall 3o and the partition 4 is charged with a seal agent 7. When a bit penetrated in a tread 15 of the tire main body 1 and the inner liner 2 is received, a degree of the bite can be decreased by freely contracting the seal agent chamber peripheral wall 3o of the inner liner 2 not bonded to the tire main body 1 without being influenced thereby, and the seal agent 7 with which inside the seal agent chamber 6 is charged buries the bite repaired, so that an outflow of air from the bite can be delayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealant-containing tire having a bag-like sealant chamber defined by a double portion of an inner liner inside a tread of a tire body.

[0002]

2. Description of the Related Art Such a tire containing a sealant is disclosed in Japanese Unexamined Patent Publication No.
It is already known from -323875. The tire containing a sealant shown in FIG. 9 is described as the second embodiment in the above-mentioned publication, and the tread 02 of the tire main body 01 is used.
A sealing agent chamber 05 partitioned by inner liners 03 and 04 is formed inside the inside, and a puncture 06 of the tread 02 and the inner liner 03 caused by a nail or the like is self-sealed with a sealing agent 07 sealed in the sealing agent chamber 05 to prevent puncturing. To delay the air leakage.

[0003] The conventional tire containing a sealant has two inner liners 03 and 04 each having a release agent applied to the opposing surface.
By performing vulcanization molding in a state of being superposed on the tire main body 01, one of the inner liners 03 is
The sealing agent chamber 05 is formed by integrally vulcanizing and bonding the inner liner 1 and vulcanizing the two inner liners 03 and 04 with the release agent.

[0004]

However, in the above-mentioned conventional one, one inner liner 03 is mounted on the tire body 0.
Since the one inner liner 03 that received the puncture 06 was not vulnerable to shrink freely, it was possible that a sufficient self-sealing effect could not be obtained.

The present invention has been made in view of the above circumstances, and has as its object to enhance the self-sealing effect of a tire containing a sealant against a puncture.

[0006]

Means for Solving the Problems In order to achieve the above object, the invention described in claim 1 adheres at least a part of an inner liner superimposed on the inner surface of a tire main body to the tire main body, and In a tire containing a sealant formed with a bag-shaped sealant chamber partitioned by a double portion of an inner liner inside, the innerliner is adhered to the tire main body at a portion other than the sealant chamber. .

According to the above structure, when the tread of the tire main body and the inner liner facing the inner surface of the tread suffer a puncture, the sealant in the sealant chamber fills and repairs the puncture, so that air from the tire is repaired. Delay the outflow. At this time, since the inner liner facing the sealant chamber is not adhered to the tread, the innerliner contracts freely without being affected by the tread, reduces the puncture, enhances the self-sealing effect of the sealant, and increases airflow. Outflow can be further delayed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 8 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of a wheel on which a tire is mounted, FIG. 2 is a first partial view of a tire manufacturing process, and FIG. FIG. 4 is an enlarged view in the direction of arrow 4 in FIG. 2, FIG. 5 is a view in the direction of arrow 5-5 in FIG. 4, and FIG. 6 is an enlarged sectional view along line 6-6 in FIG. FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 3, and FIG. 8 is an explanatory view of the operation.

As shown in FIG. 1, a tubeless tire T comprising a tire main body 1 and an inner liner 2 vulcanized and bonded therein is mounted on a rim R of a motorcycle wheel. The inner liner 2 includes a peripheral wall 3 formed in a U-shaped cross section including air chamber peripheral walls 3i, 3i located radially inward of the tire T and a sealant chamber peripheral wall 3o located radially outward. Air chamber peripheral wall 3 of peripheral wall 3
A pair of connecting portions for connecting i, 3i and the sealing agent chamber peripheral wall 3o are formed integrally with each other and connected to each other by a partition wall 4.

An air chamber 5 having a substantially circular cross section defined between the air chamber peripheral walls 3i, 3i and the partition wall 4 is filled with air, and is defined between the sealant chamber peripheral wall 3o and the partition wall 4. A known liquid sealant 7 is filled in the sealant chamber 6 having a substantially arc-shaped cross section.

The rim R has an annular rim body 11 extending in the circumferential direction of the tire T, and a pair of flanges extending radially outward from both ends in the width direction of the rim body 11 to hold the inner periphery of the tire body 1. 12, 12 are provided. An air valve 13 that fills the air chamber 5 formed inside the inner liner 2 with air is supported through an air valve attachment portion 14 formed at one location in the circumferential direction of the rim main body 11.

Since the sealant chamber 6 of the inner liner 2 is held in a shape along the inside of the tread 15 by the air pressure of the air chamber 5, the tire body 1 is punctured from the radial direction or from the side by a nail or the like. However, the sealant 7 immediately fills and repairs the puncture, and delays the leakage of air from the air chamber 5. Further, since the sealant 7 is held in the sealant chamber 6 and does not flow out to the air chamber 5 side,
There is no clogging of the air valve 13 or the pressure gauge applied thereto.

Next, a manufacturing process of the tire T will be described with reference to FIGS.

The manufacturing process of the tire T includes a material kneading process, an inner liner extrusion forming process, a cutting process, a hole forming process, a joining process, a releasing agent injection process, a drum winding process, a release sheet winding process, and a raw tire. It comprises a molding step, a mold setting step, a vulcanization step, a sealing agent injection step, a hole closing step, and an inspection step.

First, the material kneaded in the material kneading step is extruded in the inner liner extrusion molding step to form the inner liner 2 made of raw rubber. The inner liner 2 includes a sealing agent chamber peripheral wall 3o and a pair of air chamber peripheral walls 3i, which constitute the peripheral wall 3 (see FIG. 1).
3i and the partition wall 4 are integrally provided, and the sealing agent chamber peripheral wall 3o and the partition wall 4 are connected in an annular cross section, and the connection portion is connected to the pair of air chamber peripheral walls 3i, 3i. Subsequently, the inner liner 2 is cut to a predetermined length in a cutting step, and further the inner liner 2 is cut in a hole making step.
An injection hole 8 is formed in the partition wall 4.

In the subsequent joining step,
The both ends of the inner liner 2 are joined,
Make the inner 2 annular. As shown in FIGS. 4 and 5,
Holds both cut ends of inner liner 2
The holding mold 19 which is joined by joining the upper mold 20 and the upper mold 20 which open and close mutually.
And a lower mold 21. Inner liner 2
The upper mold 20 and the lower mold 2
1 shallow groove-shaped holding surface 20₁, 21₁Each
The holding surface 20 of the upper mold 20 ₁In
When the peripheral wall 3o of the sealant chamber of the knurl liner 2 is fitted
The holding surface 21 of the lower mold 21₁Inner liner 2
The air chamber peripheral walls 3i, 3i and the partition 4 are fitted.

Subsequently, a release agent 9 is injected into the sealant chamber 6 from the injection port 8 of the partition wall 4 of the inner liner 2 in a release agent injection step. The release agent 9 includes a liquid type and a powder type. However, since the liquid release agent has a drawback that it is easy to leak, the wax containing the wax works effectively at the temperature at the time of vulcanization. Powder release agents are suitable.

In the subsequent drum winding step, the annular inner liner 2 having the release agent 9 injected into the sealant chamber 6 in the release agent injection step is fitted around the drum 23. At this time, the inlet 8 of the partition wall 4 of the inner liner 2 is directed inward (a direction in contact with the outer periphery of the drum 23),
In a later step, the injection port 8 can be used for venting the sealant chamber 6 and for injecting the sealant 7 into the sealant chamber 6.

In the subsequent release sheet winding step, the drum 23
The release sheet 10 is wound around the outer periphery of the sealant chamber peripheral wall 3o of the inner liner 2 fitted to the outer periphery of the inner liner 2. The release sheet 10 is made of a fluororesin sheet (Teflon sheet) or a silicon resin sheet having a thickness of 50 μm or less, and a commercially available product is available. For example, as a Teflon sheet, there is Aflex (trade name) of Asahi Glass Co., Ltd. Then, the raw tire 24 is formed by winding the material of each part of the tire main body 1 around the inner liner 2 and the release sheet 10 in the raw tire forming step.

As shown in FIG. 6, the sealant chamber peripheral wall 3o of the inner liner 2 wound around the outer periphery of the drum 23
The release sheet 10 is wound around the outside, and the raw tire 24 wound around the outside thereof has a cord portion 25,
A pair of bead portions 26, 26 fitted to the outer periphery of the inner liner 2 so as to be continuous with both axial ends of the cord portion 25;
It comprises a cord portion 25 and a tread portion 27 which is wound so as to cover the outside of the bead portions 26, 26 in the radial direction.

Subsequently, the green tire 24 removed from the drum 23 is set between the upper mold 29 and the lower mold 30 for vulcanization molding in a mold setting step. Further, the upper mold 29 and the lower mold 30 are heated in the vulcanization step shown in FIG. 7, and the brother 31 disposed inside the raw tire 24 is inflated by air pressure. Mold 30
And vulcanization molding so as to obtain a final product shape. In this vulcanization molding, the inner liner 2 is integrated with the tire main body 1.

At this time, the air chamber peripheral walls 3i, 3i of the inner liner 2 are vulcanized and bonded to the inner surface of the tire main body 1, but the sealant chamber peripheral wall 3o of the inner liner 2 is separated from the tire main body 1 by a release sheet. Since the tires 10 are disposed, they are not vulcanized and bonded to the tire main body 1. The sealant chamber peripheral wall 3 which is a double part of the inner liner 2
Since the mold release agent 9 is previously injected between o and the partition wall 4, the sealing agent chamber 6 can be defined by preventing the vulcanization adhesion between the seal agent chamber peripheral wall 3o and the partition wall 4.

After the vulcanization molding is completed, the one in which the tire body 1 and the inner liner 2 are integrated is taken out of the mold, and the sealant 7 is inserted into the sealant chamber 6 using a syringe or the like in a sealant injection step. The tire T is completed by closing the injection port 8 with the patch 23 in the hole closing step, and the finished product is inspected in the final inspection step to complete the entire process.

As shown in FIG. 8, when a puncture 16 penetrates the tread 15 and the inner liner 2 of the tire T having the above structure, the inner liner 2 made of butyl rubber contracts by itself and the puncture 16 Reduce the size,
In addition, the sealant 7 filled in the sealant chamber 6 is
By filling and repairing, the outflow of air from the puncture 16 can be delayed. At this time, if the sealant chamber peripheral wall 3o of the inner liner 2 is vulcanized and bonded to the tire main body 1, the sealant chamber peripheral wall 3o cannot be contracted freely, so that the size of the puncture 16 is reduced slowly. . However, in this embodiment, since the sealant chamber peripheral wall 3o of the inner liner 2 is not adhered to the tire main body 1 by the release sheet 10, the self-sealing action of the puncture 16 is allowed by allowing the sealant chamber peripheral wall 3o to freely contract. Can be effectively exerted.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, a release agent can be used instead of the release sheet 10 of the embodiment. That is, instead of winding the release sheet 10 in the release sheet winding step of FIG.
If a release agent is applied to the outer periphery of the sealing agent chamber peripheral wall 3o, adhesion between the sealing agent chamber peripheral wall 3o and the tire body 1 can be prevented.

[0028]

As described above, according to the first aspect of the present invention, when the tread of the tire body and the inner liner facing the inner surface of the tread suffer a puncture, the sealant in the sealant chamber is replaced by the sealant. Filling and repairing stabs slows out the air from the tires. At this time, since the inner liner facing the sealant chamber is not adhered to the tread, the innerliner contracts freely without being affected by the tread, reduces the puncture, enhances the self-sealing effect of the sealant, and increases airflow. Outflow can be further delayed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a wheel equipped with a tire.

FIG. 2 is a first partial view of a tire manufacturing process diagram.

FIG. 3 is a second partial view of a tire manufacturing process diagram.

FIG. 4 is an enlarged view in the direction of arrows in FIG. 2;

FIG. 5 is a view taken along line 5-5 in FIG. 4;

FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 2;

FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 3;

FIG. 8 is an explanatory diagram of an operation.

FIG. 9 is a diagram illustrating the operation of a conventional tire containing a sealant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tire main body 2 Inner liner 6 Sealant room 15 Tread

Claims (1)

[Claims] At least a part of an inner liner (2) superimposed on an inner surface of a tire body (1) is adhered to the tire body (1), and a double of the inner liner (2) is provided inside a tread (15). In a tire containing a sealant formed with a bag-like sealant chamber (6) partitioned by portions, the inner liner (2) is adhered to the tire body (1) at a portion outside the sealant chamber (6). A tire containing a sealant, characterized in that: