JP2009046011A - Fixing method of sound absorption member to pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the attachment/detachment of a sound-absorption member at the repairing of a blowout or the like by suppressing the reduction of uniformity while suppressing a production cost and enhancing fuel economy in a pneumatic tire capable of detachably fixing the sound-absorption member, and to fix the sound-absorption member by a single fixing unit and to quickly and easily perform the attachment/detachment of the sound-absorption member and the fixing unit when the sound-absorption member is fixed to the pneumatic tire. <P>SOLUTION: The pneumatic tire is provided with the sound-absorption member 11. In the pneumatic tire, the sound-absorption member 11 is fixed to the inner surface of an inner liner 10 by at least one circular fixing unit 12 which is elastically and deformedly expanded and contracted in diameter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pneumatic tire including a sound absorbing member made of a porous material, and particularly facilitates the attachment and detachment of the sound absorbing member when repairing the puncture of such a pneumatic tire, suppresses production costs, and reduces fuel consumption. It is intended to suppress the decrease in uniformity while improving the performance. The present invention also relates to a method for fixing a sound absorbing member to a pneumatic tire. In particular, the sound absorbing member is fixed by a single fixing tool, and the mounting and dismounting thereof is quick and easy.

  The pneumatic tire assembled in the rim and attached to the vehicle vibrates while the tread portion vibrates against the unevenness of the road surface while the vehicle is running, so that the air filled in the tire cavity resonates. This cavity resonance is a main cause of so-called road noise, and many of the resonance frequencies exist in the range of 180 to 300 Hz. When the road noise is transmitted to the vehicle interior, unlike a noise in other frequency bands, it takes a sharp and high peak value, which is annoying noise for passengers in the vehicle interior.

  In order to suppress such cavity resonance and reduce road noise, Patent Document 1 discloses a ring for sound control made of a porous material in a tire lumen formed by a rim and a pneumatic tire attached to the rim. A pneumatic tire in which a sound absorbing member is fixed in the tire circumferential direction has been proposed.

  As a method for fixing the sound absorbing member, it may be adhered to the inner surface of the inner liner using a styrene-butadiene rubber latex adhesive, an aqueous polymer-isocyanate adhesive, or an acrylic or synthetic resin adhesive tape. In addition, after temporarily fixing with such an adhesive tape or adhesive, the inner surface of the inner liner can be impregnated and fixed by vulcanization molding by heating and pressurization. Moreover, like the pneumatic tire of patent document 2, the sound absorption member arrange | positioned in the tire inner surface can also be elastically fixed on the tire inner surface using the ring-shaped fixing tool which elastically deforms.

Japanese Patent No. 3622957 JP 2003-226104 A

  However, if the sound absorbing member is fixed by impregnating the inner surface of the adhesive tape, adhesive, or inner liner, it will take time and labor to remove the sound absorbing member. There is a risk that it cannot be repaired. Specifically, when a puncture occurs in the tread part, the range corresponding to the failure location and the sound absorbing member in the vicinity thereof are removed by hand, and buffed with a grinder evenly until the inner liner is exposed. . Next, the surface is smoothed with a scratcher to remove scraps. Only then will it be possible to repair punctures using plug patches as usual. Further, when the normal puncture repair is completed, the sound absorbing member is attached again to the portion from which the sound absorbing member has been removed. Thus, compared to a pneumatic tire that does not include a sound absorbing member, a pneumatic tire that includes a sound absorbing member requires time and labor to repair a faulty part such as a puncture. As a countermeasure, it has been proposed to elastically fix the sound absorbing member disposed on the inner surface of the tire elastically on the inner surface of the tire using a ring-shaped fixture that elastically deforms, as in the pneumatic tire described in Patent Document 2. . In such a pneumatic tire, when a failure such as puncture occurs, it is possible to remove the ring-shaped fixture and remove the sound absorbing member without damaging the inner surface of the tire. Therefore, it becomes easy to repair such a faulty part and attach the sound absorbing layer after the repair. However, since both ends of the ring-shaped fixture are fixed on the inner surface of the tire by the fastening band, it is necessary to attach and detach the fastening band every time the fixture is attached and detached, which takes time and effort. In addition, since the sound absorbing member is fixed using a plurality of components, the production cost increases as the number of components increases. Furthermore, the weight of the tire is biased by attaching the fastening band, and the uniformity of the tire may be reduced. Of course, as described in Patent Document 2, in consideration of the weight balance, a plurality of fastening bands can be arranged at equal intervals in the tire circumferential direction, but then the weight of the tire increases. There is a risk that the fuel consumption will be reduced. Further, when the number of parts increases, not only the production cost increases in proportion to the increase in the number of parts, but also it takes time and labor to attach and detach the fixture, which is not preferable.

  Accordingly, an object of the present invention is to solve these problems. The purpose of the present invention is to attach / detach the sound absorbing member at the time of repairing a puncture or the like in a pneumatic tire capable of detachably fixing the sound absorbing member. It is an object of the present invention to provide a pneumatic tire that can reduce the uniformity while suppressing the production cost and improving the fuel efficiency. A further object of the present invention is to provide a fixing method for fixing a sound absorbing member to a pneumatic tire by fixing the sound absorbing member with a single fixing tool so that the sound absorbing member and the fixing tool can be attached and detached quickly and easily. There is to do.

  In order to achieve the above object, a pneumatic tire having a sound absorbing member made of a porous material according to the present invention can be elastically expanded and contracted in diameter and reduced until it becomes smaller than the diameter of the rim hole of the pneumatic tire. The sound absorbing member is elastically fixed on the inner surface of the inner liner by at least one arc-shaped fixture that can be deformed in diameter. Since such a pneumatic tire is provided with a sound absorbing member, road noise due to cavity resonance can be reduced. In addition, the arc-shaped fixture can be easily removed when repairing a failure location such as a puncture, and accordingly, the sound absorbing member can be easily attached and detached. Moreover, since the sound absorbing member is fixed by a single fixing tool, the production cost can be suppressed. Furthermore, since a plurality of parts are not used, an increase in weight can be suppressed, and fuel efficiency can be improved. Furthermore, since no fastening band is used, there is no bias in weight compared to the case where the fastening band is used for fixing, so that the tire uniformity can be improved. Here, the “arc-shaped fixture” refers to a tire that extends in an arc shape in the tire circumferential direction within the tire and that both ends thereof are in contact with or separated from each other in the tire circumferential direction. It shall be the one that does not overlap and extend in the circumferential direction.

  Moreover, it is preferable that the both ends of an arc-shaped fixing tool are spaced apart in the tire circumferential direction.

  Furthermore, it is preferable that the opening angle with respect to the tire axis at both ends of the arc-shaped fixture in the tire circumferential cross section is 90 ° or less. Here, the “open angle” refers to an angle formed by drawing a straight line from the tire axis to both ends of the arc-shaped fixture and forming both straight lines.

  The method according to the present invention is a method of fixing a sound absorbing member made of a porous material to a pneumatic tire, wherein the sound absorbing member is disposed on the inner surface of the inner liner of the pneumatic tire, and elastically expands and contracts the diameter. The radially deformable arcuate fixture is elastically deformed radially inward of the arcuate fixture to reduce the maximum diameter of the arcuate fixture until it becomes smaller than the diameter of the tire body rim hole. The reduced diameter arc-shaped fixture is inserted into the tire from the rim hole, the arc-shaped fixture is expanded along the inner peripheral surface of the sound absorbing member, and the sound absorbing member is connected to the arc-shaped fixture and the inner liner layer. The sound absorbing member is fixed to the pneumatic tire by fixing the sound absorbing member to the pneumatic tire. By adopting such a fixing method, the single arc-shaped fixture can be elastically deformed and removed, so that the sound absorbing member can be quickly and easily removed, so that the sound absorbing member can be fixed using a plurality of parts. It is possible to remove the sound absorbing member more quickly than in the case where it is. Further, since the sound-absorbing member can be fixed by elastically deforming the single arc-shaped fixing tool after repair, it is possible to reduce labor and time compared to the case of fixing using a plurality of parts. Therefore, it is possible to save time and trouble from the occurrence of a failure such as puncture until the repair is completed.

  According to the present invention, in a pneumatic tire capable of detachably fixing the sound absorbing member, the sound absorbing member can be easily attached and detached at the time of puncture repair, the production cost is suppressed, the fuel efficiency is improved, and the uniformity is reduced. It is possible to provide a suppressed pneumatic tire. In addition, according to the present invention, when fixing the sound absorbing member to the pneumatic tire, a fixing method is provided in which the sound absorbing member is fixed by a single fixing tool, and the sound absorbing member and the fixing tool can be quickly and easily attached and detached. Is possible.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view in the tire width direction of a typical pneumatic tire (hereinafter referred to as “tire”) according to the present invention. FIG. 2 is a partial development view of the tire inner surface of the tire shown in FIG. FIG. 3 shows a tire circumferential sectional view of the tire according to the present invention.

  A tire 1 according to the present invention includes a tread portion 2 that contacts a road surface, a pair of sidewall portions 3 that extend inward in the tire radial direction from both side portions of the tread portion 2, and a tire radial direction of each sidewall portion 3. A tire body 5 is constituted by a pair of bead portions 4 provided inside and fitted to the rim. Inside the tire body 5, a bead core 6, 6 embedded in each bead portion 4 extends in a toroidal shape to form a skeleton structure of the tire body 5, for example, a radial structure carcass 7, and a crown area of the carcass 7. A belt 8 that reinforces the tread portion 2 is provided. An air-impermeable inner liner 10 is disposed on the inner surface side of the tire body 5, that is, on the side facing the tire lumen 9 defined by the tire 1 and the rim. Moreover, as shown in FIGS. 1-3, the tire 1 of this invention has arrange | positioned the one sound absorption member 11 which consists of a porous material along the tire circumferential direction on the inner surface of the inner liner 10. As shown in FIG. The arc-shaped fixture 12 is elastically fixed inside the sound-absorbing member 11 in the tire radial direction, and the sound-absorbing member 11 is sandwiched between the arc-shaped fixture 12 and the inner liner 10.

  In order to manufacture the tire 1, the sound absorbing member 11 is disposed on the inner surface of the inner liner 10 of the tire 1. Next, the elastically expandable and contractible arcuate fixture 12 shown in FIG. 4 (a) is deformed radially inward, and the rim hole 13 of the tire 1 is shown in FIG. 4 (b). The diameter is reduced to be smaller than the diameter. With the diameter of the arc-shaped fixture 12 thus reduced, the arc-shaped fixture 12 is inserted into the tire from the rim hole 13 of the tire 1 as shown in FIG. As shown, the diameter of the arcuate fixture 12 is increased along the inner peripheral surface of the sound absorbing member 11. As a result, the tire 1 in which the sound absorbing member 11 is fixed between the arcuate fixture 12 and the inner liner 10 is obtained. By adopting such a sound absorbing layer fixing method, the single arcuate fixture 12 can be elastically deformed and removed, and the sound absorbing member 11 can be quickly and easily removed. It is possible to remove the sound absorbing member 11 more quickly than when the sound absorbing member 11 is fixed by using. In addition, since the sound absorbing member 11 can be fixed by elastically deforming the single arcuate fixing tool 12 after repair, it is possible to reduce labor and time compared to the case of fixing using a plurality of parts. . Therefore, it is possible to save time and trouble from the occurrence of a failure such as puncture until the repair is completed. In addition, as long as the sound absorbing member 11 can be sufficiently fixed, the same arcuate member 12 can be applied to other tires and is highly versatile. Further, this fixing method can be applied to a tire having a large tire diameter and a considerably small rim hole diameter.

  For the above-described reason, the tire 1 in which the sound absorbing member is fixed by adopting such a fixing method can save time and trouble from the occurrence of a puncture failure until the repair is completed. Moreover, since the tire 1 has the sound absorbing member 11 fixed by a single fixture, the production cost can be reduced. Furthermore, since a plurality of parts are not used, an increase in weight can be suppressed, and fuel efficiency can be improved. Furthermore, since the arc-shaped fixture 12 is fixed without using a fastening band, there is no bias in weight compared to the case where it is fixed by a fastening band, so that it is possible to suppress a decrease in uniformity of the tire 1. Become. The size, shape, number, and the like of the arcuate fixture 12 can be appropriately changed according to the tire size, the internal pressure during use, the curved shape of the tire inner surface, the strength of the sound absorbing member 11, and the like.

  Moreover, it is preferable that the both ends 14 and 14 of the arc-shaped fixing tool 12 are spaced apart in the tire circumferential direction. This is because when both ends 14 and 14 of the arcuate fixture 12 are in contact, both ends 14 and 14 of the arcuate fixture 12 are repeatedly brought into contact with each other at the time of tire load rolling, and the both ends 14 and 14 are destroyed. This is because there is a possibility. Further, when the arcuate fixture 12 extends so as to overlap in the tire circumferential direction, the attachment and detachment becomes complicated, and it takes time and labor for puncture repair or the like.

  Further, the opening angle x based on the tire axis of both ends 14 and 14 of the arc-shaped fixture 12 in the tire circumferential cross section is preferably 90 ° or less, and more preferably 30 ° or less. This is because when the opening angle x exceeds 90 °, a region sandwiching the sound absorbing member 11 is insufficient, and the sound absorbing member 11 is partially released from the inner liner 10, and the released portion is a tire. This is because there is a possibility that the uniformity of the tire 1 is lowered during load rolling.

  The sound absorbing member 12 can be constituted by a foam of rubber or synthetic resin, or a nonwoven fabric made of synthetic fiber, plant fiber or animal fiber, having an open cell structure or a closed cell structure. And when comprising the strip | belt-shaped member 12 with a nonwoven fabric, in order to exhibit a required sound-absorbing effect, it shall make the specific gravity into the range of 0.1-2.0, and the average diameter of a fiber. It is preferable to set it as 0.1-200 micrometers.

  The above description shows only a part of the embodiment of the present invention, and these configurations can be combined alternately or various changes can be made without departing from the gist of the present invention. For example, as shown in FIG. 5 (a), by using an arcuate fixture 12 having a large surface area for sandwiching the sound absorbing member 11, the sound absorbing member 11 can be fixed more firmly, and sound absorption during tire load rolling can be achieved. It is possible to prevent the sound absorbing member 11 from shifting while suppressing the peeling and dropping of the member 11. Further, as shown in FIG. 5B, by arranging three arcuate fixtures 12, the sound absorbing member 11 can be fixed more firmly than in the case where only one arcuate fixture 12 is provided. It is possible to prevent the sound absorbing member 11 from shifting while suppressing the peeling and dropping of the sound absorbing member 11 during movement. Further, it is possible to reduce the weight as compared with the case where a single belt-like arcuate fixture 12 is disposed in the same range. In addition, in FIG.5 (b), although the cross-sectional shape of the arc-shaped fixing tool 12 is a square, the shape is not limited to this, It can also be made into a circle. Alternatively, as shown in FIG. 5 (c), by providing rectangular holes 15 in a single strip-shaped arc-shaped fixture 12 at equal intervals, the weight of the tire 1 can be reduced and the sound absorbing member can be extended over a wide range. 11 can be fixed. Further, both ends 14 and 14 of the arcuate fixture 12 are formed in a hemispherical shape, and when the both ends 14 and 14 of the arcuate fixture 12 are moved during tire load rolling, the both ends 14 and 14 serve as the sound absorbing member 11. It can be prevented from being damaged.

  As is apparent from the above, according to the present invention, in the pneumatic tire capable of detachably fixing the sound absorbing member, the sound absorbing member can be easily attached and detached at the time of repair such as puncture, the production cost is suppressed, and the fuel efficiency is improved. While improving, it becomes possible to provide a pneumatic tire in which a decrease in uniformity is suppressed. Further, according to the present invention, when fixing the sound absorbing member to the pneumatic tire, it is possible to provide a fixing method in which the sound absorbing member is fixed by a single fixing tool, and the sound absorbing member and the fixing tool can be quickly and easily attached and detached. It becomes.

1 is a sectional view in the tire width direction of a typical tire according to the present invention. FIG. 2 is a partial development view of the tire inner surface of the tire shown in FIG. 1. 1 is a tire circumferential cross-sectional view of a tire according to the present invention. (A) is a figure which shows the arc-shaped fixing tool according to this invention, (b) is the figure which elastically deformed the arc-shaped fixing tool in the radial direction inner side, and was reduced in diameter, (c) is ( It is the figure which inserted the arc-shaped fixing tool shown to b) from the rim hole of a tire, (d) is the figure which expanded the diameter of the arc-shaped member shown to (c) along the internal peripheral surface of a sound-absorbing member. (A)-(c) is a perspective view of the other arc-shaped fixing tool according to this invention, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire 2 Tread part 3 Side wall part 4 Bead part 5 Tire main body 6 Bead core 7 Carcass 8 Belt layer 9 Tire inner cavity 10 Inner liner 11 Sound absorbing member 12 Arc-shaped fixing tool 13 Rim hole 14 End part 15 of arc-shaped fixing tool Rectangular Hole CL Tire Equatorial Surface

Claims (4)

In a pneumatic tire having a sound absorbing member,
The sound absorbing member is placed on the inner surface of the inner liner by at least one arcuate fixture that can be elastically expanded and contracted and reduced in diameter until it becomes smaller than the diameter of the rim hole of the pneumatic tire. A pneumatic tire characterized by being elastically fixed.   The pneumatic tire according to claim 1, wherein both ends of the arcuate fixture are spaced apart in the tire circumferential direction.   The pneumatic tire according to claim 1 or 2, wherein an opening angle based on tire axis lines at both ends of the arc-shaped fixture in a tire circumferential cross section is 90 ° or less. In the method of fixing the sound absorbing member to the pneumatic tire,
The sound absorbing member is disposed on the inner surface of the inner liner of the pneumatic tire,
An arcuate fixture that can be elastically expanded and contracted is elastically deformed radially inward of the arcuate fixture, so that the maximum diameter of the arcuate fixture is increased to the rim hole of the tire body. Until the diameter is smaller than
Inserting the reduced diameter arc-shaped fixture into the tire from the rim hole,
The arc-shaped fixture is expanded along the inner peripheral surface of the sound-absorbing member, and the sound-absorbing member is sandwiched between the arc-shaped fixture and the inner liner layer. A method of fixing a sound absorbing member to a pneumatic tire, wherein the sound absorbing member is fixed to the tire.

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