JPS61146608A - Pneumatic tubeless tire with puncture prevention function - Google Patents

Abstract

PURPOSE:To prevent the puncture of a tire even when foreign matters such as nails pierce into the main body of the tire by forming a non-adhesion section between an annular tire liner layer that is made of thin soft high elongation elastic material and has not been elongated and the inner surface of the tire. CONSTITUTION:An annular tire liner layer 3 made of thin soft high elongation elastic material is arranged on the tire inner surface 2 of a tire main body 1 touching the inner surface. In addition, for the surface that adjoins to the tire inner surface 2 of the said layer 3, at least both ends 4 and 4' are adhesion sections 5 and 5'. On the other hand, a greater part is made to touch the tire inner surface 2 in a non-elongation state and is left in a non-adhesion state,and then forms a tire air chamber 6 and a closed non-adhesion part 7 for an outer world. As a result the non-adhesion part 7 of the said layer 3 can be separated easily from the tire main body 1 and can greatly be deformed. Even when foreign matters such as nails pierce into the tire main body 1, puncture can be prevented by the same layer 3.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is: - When a foreign object such as a nail pierces the pneumatic tubeless tire, the tire can prevent the foreign object from penetrating into the tire air chamber containing inflated air. Also, even if you escape after penetrating, it is essentially a tire! The present invention relates to a pneumatic tubeless tire that has a so-called puncture prevention function that prevents air leakage.

(Prior Art) In the past, many woodcutter tires have been proposed.1 For example, Japanese Patent Publication No. 44-811a8 and Japanese Patent Publication No. 59-28708 disclose that even if a foreign object such as a nail pierces the tire body, the inner surface of the tire remains intact. A tire is disclosed in which a steel plate or a tire liner layer having a substantially protective thickness prevents penetration of foreign objects into the air chamber. As this woodcutter's tire,
A tire in which an adhesive sealing material is provided on the inner surface of the tire is also known from Japanese Patent Publication No. 58-55196.

(Problem to be solved by the invention) However, Japanese Patent Publication No. 44-81528 1% Publication No. 59-28
Tires such as those described in Publication No. 708 not only have a large weight, but also change in tire deformation behavior and ground contact behavior, resulting in deterioration in handling performance and ride comfort, and heat generation due to internal friction, etc. This has the drawback of significantly reducing tire performance, such as shortening tire life.

On the other hand, when using an adhesive sealant, the sealant
Due to its fluidity, the centrifugal force caused by tire running tends to concentrate in the center of the tire, which reduces the layer thickness of the adhesive sealant on the inner part of the tread shoulder and seals this area. There was a problem that the ability was not retained sufficiently.

(Means for Solving the Problems) An object of the present invention is to provide a pneumatic tubeless tire that does not have the various drawbacks mentioned above, is simple, and has a puncture prevention function. This purpose is to provide a pneumatic tubeless tire in which an annular tire liner layer is disposed in contact with the inner surface of the tire. At least both ends of the surface are sealed and fixed to the inner surface of the tire around the entire circumference, but the remaining portion is left in contact with the inner surface of the tire in an unstretched state and left unadhered, leaving a non-adhered portion between it and the inner surface of the tire. This is achieved by using a pneumatic couture press tire in which the non-bonded portion is separated from the air in the tire air chamber.

The present invention will be explained in more detail below with reference to one drawing.

FIG. 1 is a schematic cross-sectional view of the pneumatic tubeless tire of the present invention, in which an annular tire liner layer 8 is disposed on the tire inner surface 2 of the tire body 1 in contact therewith. This annular tire liner layer 8 is made of a thin, soft and highly extensible elastic material. This tire liner layer 8 has at least the number of both end portions on the surface in contact with the tire inner surface 2 VC.
4' is bonded at adhesive portions 5 and 5' around its entire circumference, and is air-tightly adhesively fixed to the inner surface of the tire 2. The adhesive parts 5 and 6' are
In addition to the ends 4, 4', other parts may be included as required, but most of the surface of the tire liner layer 8 that is in contact with the inner surface 2 of the tire is a, tX. It is brought into contact with the inner surface of the tire in the stretched state, left unadhered, and brought into contact with the inner surface of the tire by 2 degrees. The surface of the annular tire liner 8 and the bonded portion form a tire air chamber 6 and a non-bonded portion 7 that is closed to the outside world. The tire liner layer 8 must have an elongation at break of 70,096 or more; It is preferable that it is 1000% or more. Elastic materials with an elongation at break of less than 100% do not have a sufficient bank prevention function. Ninth, this liner layer 8 should be thin.

The actual thickness is determined in consideration of the elongation at break, hardness, etc. of the elastic material used, but is preferably 1.5 M or less. If it floats too much, the tray becomes too large, causing problems similar to those of conventional technology.

In this invention, the non-bonded portion 7 needs to cover at least the tire shoulder portions 8, 8', and based on this, the bonded portion 5.5' of the tire liner layer 8 is
. The positions of both end portions 4.4' may be moved closer to the tire bead portions 9, 9' as required, and finally, as shown in FIG.
It can be as high as ’.

Also, 8th r: j! JK, as shown, an appropriate space can be obtained between the tire body 1 and the tire liner layer 8 by providing an elastic material layer 10 such as rubber or urethane foam between the tire lie layer 8 and the tire body 1. can.

When the tire of the present invention is filled with air and is running, when a foreign object such as a nail pierces the tire, the foreign object such as 9F pierces the tire body and applies strong concentrated stress locally to the annular tire liner layer 8. . On the other hand, the tire liner layer 8 receives filling air pressure from the air chamber 6 on the opposite surface, and the tire inner surface 2
Under these conditions, the tire liner layer 8 must withstand the penetration of the foreign object, substantially prevent the foreign object from penetrating the air chamber, and prevent punctures. , the layer 8 must be locally deformable and must be able to prevent air leakage even if it penetrates and foreign matter escapes. In contrast, the thin, soft, highly elongated elastic material of the present invention It was confirmed that the arrangement as described above is suitable.

The reasons why the tire liner layer 8 of the present invention is suitable as described above are as follows: (1) The non-adhesive portion 7 of the tire liner layer B can be easily separated from the tire body.

(2) The tire liner layer 8 is placed in contact with the tire inner surface BK in an unstretched state for the most part.

It is a highly extensible elastic material that can effectively utilize its deformation ability and can be deformed to a large extent.

(8) Since the inner layer of the tire 2 is made of a thin soft material, it tightly adheres to foreign objects such as nails, enveloping them, as shown in Figure 4, and has the effect of reducing strain concentration at the tip of the foreign object. (4) Even if a foreign object penetrates through the tire, it will undergo a large deformation, so the through hole is small and has the ability to tighten the foreign object. (i) Even if a foreign object escapes from the tire, the tire liner layer Since it is a soft elastic material, the liner recovers almost to its initial unstretched state and has the ability to bring the damaged part into close contact.(Examples) The present invention will be explained in more detail below with reference to Examples.

Example 1-10. Comparative Example 1.2 A pneumatic stew press tire with a tire size of 195/TOR14 has a primary fil and a 1w! having the formulation, physical properties, and thickness shown in Table 2. The annular tire liner layer manufactured by
As shown in FIG. 1, the non-adhesive portion was left (only the next comparative example 2 was fully adhesive), and the vicinity of both ends were adhesively fixed to the inner surface of the tire in a substantially unstretched state.

Assemble this tire into a rim and set the air pressure to g, Okg/I
yR'', and drove various types of nails shown in Table 2 through the tire tread, leaving only the nail heads, and checked with soapy water for air leakage after pulling out.

Table 1 The results are shown in Table 2.

(Effects of the Invention) As shown in the above embodiments, the pneumatic stew press tire of the present invention has a substantially unstretched annular tire liner layer made of a thin, soft, and highly elongated elastic material, which allows the tire liner layer to have a structure between it and the inner surface of the tire. By forming a closed non-adhesive part that covers at least the tire tread surface including a part of the tire shoulder.

It is clear that the tire liner layer also has the ability to prevent punctures even if a foreign object such as a nail pierces the tire body.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a tire showing nine examples in which the non-adhesive portion of the annular tire liner layer is provided inside the tread surface, showing an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a tire showing another embodiment of the present invention, in which the non-bonded portion of FIG. 1 is provided almost over the entire inner surface of the tire. In FIG. 8, a relatively thick layer of elastic material is provided between the tire liner layer and the tire body. FIG. 3 is a schematic cross-sectional view of a tire showing another embodiment of the present invention. Figure 4 shows the case where nine nails penetrate the tire body of this invention.
FIG. 3 is an explanatory diagram showing that the annular tire liner layer is prevented from following the nail and penetrating into the tire air chamber. l... Tire body 2... Tire inner surface 8...
・Annular tire liner layer number, 4′...Annular tire liner layer both layer parts 5.5′・
...Adhesive part 6...Tire air chamber 7...Non-adhesive part 8.8'...Shoulder part 9.9'
...Bead portion 10...Elastic material layer 11...Nail Patent applicant Bridgestone Corporation Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] 1. In a pneumatic tubeless tire in which an annular tire liner layer is disposed in contact with the inner surface of the tire, the annular tire liner layer is made of a thin, soft and highly elongated elastic material, and at least both ends of the surface of the layer in contact with the inner surface of the tire are provided. part is sealed and fixed to the inner surface of the tire around the entire circumference, while the remaining part is brought into contact with the inner surface of the tire in an almost unstretched state and left unadhered to form a non-adhered part between it and the inner surface of the tire.
A pneumatic tubeless tire characterized by separating this non-adhesive portion from the air in the tire air chamber.