JP5217616B2 - How to store pneumatic tires - Google Patents

Description

The present invention relates to a method for storing a pneumatic tire, and more particularly, allows a common tire inner surface protector to be applied to a plurality of types of pneumatic tires having different sizes, and impairs the handleability of the pneumatic tire. The present invention relates to a method for storing a pneumatic tire that can protect the inner surface of the tire without any problems.

  In recent years, a sound absorbing material made of urethane foam is disposed on the inner surface of a pneumatic tire, and cavity resonance noise is reduced by the sound absorbing material. However, since the deterioration of the sound absorbing material made of urethane foam is accelerated by ultraviolet rays or moisture, it is necessary to pay attention to the handling of the tire in the distribution route and the sales point. In particular, when tires are stacked outdoors, it is necessary to protect the sound absorbing material made of urethane foam from ultraviolet rays and moisture.

  In view of such inconveniences, it has been proposed to individually package the entire tire, or to attach a protective member to the bead portion to block the hollow portion of the pneumatic tire from the outside (for example, Patent Document 1). reference).

However, when the entire tire is individually packaged, there is a problem that handling of the pneumatic tire is hindered and its transportation and stacking become difficult. On the other hand, when a protective member is attached to the bead portion, it is necessary to prepare a protective member for each tire size. Therefore, the management of the protective member is complicated, and the management cost of the tire is greatly increased.
International Publication No. WO03 / 103989 Pamphlet

An object of the present invention is to make it possible to apply a common tire inner surface protector to a plurality of types of pneumatic tires of different sizes, and to protect the tire inner surface without impairing the handleability of the pneumatic tire. An object of the present invention is to provide a storage method for a pneumatic tire.

In order to achieve the above object, a pneumatic tire storage method according to the present invention uses a tire inner surface protector having flexibility and a structure that can be inserted into the tire cavity, and the tire inner surface protector is disposed inside the tire cavity. In the pneumatic tire storage method of storing the pneumatic tire before assembling the rim in the state inserted in the
A plurality of flexible annular bodies are used as the tire inner surface protector, the plurality of annular bodies are inserted into the tire cavity so as to be aligned in the tire width direction, and the annular bodies are paired with a pair of pneumatic tires. It arrange | positions so that it may pinch | interpose between bead parts .

The pneumatic tire storage method of the present invention for achieving the above object uses a tire inner surface protector having flexibility and a structure that can be inserted into a tire cavity, and the tire inner surface protector is used as a tire. In the pneumatic tire storage method of storing the pneumatic tire before assembling the rim in a state inserted in the cavity,
As the tire inner surface protector, a rod-like body having flexibility longer than the inner peripheral length in the tread portion of the pneumatic tire is used, and the rod-like body is spirally wound in the tire cavity and arranged along the tire inner surface. The plurality of circular portions of the rod-like body are arranged so as to be aligned in the tire width direction .

  In the present invention, when storing the pneumatic tire before assembling the rim, since a tire inner surface protector having flexibility and a structure that can be inserted into the tire cavity is used, the size of the common tire inner surface protector is different. It can be applied to a plurality of types of pneumatic tires. Moreover, since the said tire inner surface protector is inserted in a tire cavity, it can protect a tire inner surface, without inhibiting the handleability of a pneumatic tire.

When a flexible annular body is used as a tire inner surface protector , the outer diameter of the annular body is larger than the inner diameter of the bead portion of the pneumatic tire, and the inner diameter of the annular body is the inner diameter of the bead portion of the pneumatic tire. less than, and the annular body can abut the bead portions on both sides in the inserted state into the tire cavity portion. In particular, when an annular body having a hollow structure made of a polymer material is used, the weight can be reduced.

Further, as the tire inner surface protection, flexibility when using rod-shaped body having, in particular, when the rod-shaped body having a hollow structure made of a polymer material, it is possible to weight reduction.

  The polymer material is preferably a thermoplastic resin or an elastomer material. When a thermoplastic resin is used, the recyclability when the tire inner surface protector becomes unusable due to damage or the like is excellent. On the other hand, when an elastomer material is used, the adhesion of the tire inner surface protector to the tire is improved and the durability when repeatedly used is also improved.

  The present invention is applicable to storing various types of pneumatic tires, and is particularly suitable for storing pneumatic tires in which a sound absorbing material made of urethane foam is installed on the tire inner surface. In this case, the sound absorbing material made of urethane foam can be protected from ultraviolet rays and moisture, and its deterioration can be effectively suppressed.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a tire inner surface protector and a pneumatic tire as reference examples for explaining the present invention. 1 and 2, the pneumatic tire T includes a tread portion 1, a pair of sidewall portions 2, and a pair of bead portions 3. A sound absorbing material 4 made of urethane foam is installed on the tire inner surface of the tread portion 1 of the pneumatic tire T.

  As shown in FIG. 1, the tire inner surface protector 10 has a structure that is flexible and can be inserted into the tire cavity 5. More specifically, the tire inner surface protector 10 includes an annular body 11 that extends annularly along the tire circumferential direction and has flexibility, and has a generally donut shape (see FIG. 2). The outer diameter Do of the annular body 11 is larger than the inner diameter di of the bead portion 3 of the pneumatic tire T, and the inner diameter Di of the annular body 11 is smaller than the inner diameter di of the bead portion 3 of the pneumatic tire T. The annular body 11 comes into contact with the bead portions 3 and 3 on both sides in the inserted state into the tire cavity 5.

  Storing the pneumatic tire T before assembling the rim in a state where the tire inner surface protector 10 made of the annular body 11 is inserted into the tire cavity 5, thereby protecting the tire inner surface on which the sound absorbing material 4 made of urethane foam is installed can do. Thereby, the sound absorbing material 4 made of urethane foam can be protected from ultraviolet rays and moisture, and its deterioration can be suppressed.

  Here, since the tire inner surface protector 10 made of the annular body 11 is elastically deformable, it can be applied to a plurality of types of pneumatic tires T having different sizes. Moreover, since the tire inner surface protector 10 is inserted into the tire cavity 5, the tire inner surface can be protected without impairing the handleability of the pneumatic tire T.

In the above embodiment , the annular body 11 has a hollow structure made of a polymer material. That is, the annular body 11 is obtained by enclosing a gas in a tube made of a polymer material. When the annular body 11 has a hollow structure, it is advantageous in terms of weight reduction. However, the annular body 11 is not limited to the tube type, and may be formed from urethane containing closed cells, for example.

FIG. 3 shows a tire inner surface protector and a pneumatic tire as another reference example for explaining the present invention. As shown in FIG. 3, the tire inner surface protector 10 does not have to have the maximum outer diameter portion in contact with the sound absorbing material 4 on the tire inner surface in a state where the tire inner surface protector 10 is inserted into the tire cavity portion 5. As long as it is inserted in

Figure 4 shows a tire inner surface protective equipment and pneumatic tires made of an embodiment of the present invention. As shown in FIG. 4, a plurality of annular bodies 11 are inserted into the cavity 5 of one pneumatic tire T, and these annular bodies 11 are arranged so as to be sandwiched between a pair of bead portions 3 and 3. Yes .

5 and 6 show a tire inner surface protector and a pneumatic tire according to another embodiment of the present invention. As shown in FIG. 5, the tire inner surface protector 20 has a structure that is flexible and can be inserted into the tire cavity 5. More specifically, the tire inner surface protector 20 includes a rod-like body 21 that is longer than the inner peripheral length of the tread portion 1 of the pneumatic tire T and has flexibility. And the rod-shaped body 21 is arrange | positioned along the tire inner surface so that it may wind at least 1 round spirally within the tire cavity 5 (refer FIG. 6). The rod-shaped bodies 21 are in close contact with each other every turn, and cover the tire inner surface on which the sound absorbing material 4 is installed without any gaps.

  By storing the pneumatic tire T before assembling the rim in a state where the tire inner surface protector 20 made of the rod-shaped body 21 is inserted into the tire cavity 5, the inner surface of the tire on which the sound absorbing material 4 made of urethane foam is installed is protected. can do. Thereby, the sound absorbing material 4 made of urethane foam can be protected from ultraviolet rays and moisture, and its deterioration can be suppressed.

  Here, since the tire inner surface protector 20 made of the rod-like body 21 can be elastically deformed, it can be applied to a plurality of types of pneumatic tires T having different sizes. Moreover, since the tire inner surface protector 20 is inserted into the tire cavity 5, the tire inner surface can be protected without impairing the handleability of the pneumatic tire T.

  In this embodiment, the rod-shaped body 21 has a hollow structure made of a polymer material. That is, the rod-shaped body 21 is a tube made of a polymer material in which gas is sealed. The rod-shaped body 21 having a hollow structure is advantageous in terms of weight reduction. However, the rod-shaped body 21 is not limited to the tube type, and may be formed from urethane containing closed cells, for example.

FIG. 7 shows a tire inner surface protector and a pneumatic tire according to still another embodiment of the present invention. As shown in FIG. 7, the tire inner surface protector 20 can be composed of a rod-shaped body 21 having a flat hollow structure. Moreover, the hollow part of the rod-shaped body 21 does not need to be continuous in the length direction. It may be partitioned into cells.

  As the polymer material constituting the tire inner surface protectors 10 and 20 described above, a thermoplastic resin or an elastomer material can be used. Examples of the thermoplastic resin include polyethylene, polyolefin, polyvinyl chloride, polyvinyl alcohol and a mixture thereof, and further, a thermoplastic elastomer (urethane). When a thermoplastic resin is used, the recyclability when the tire inner surface protector becomes unusable due to damage or the like is excellent. On the other hand, as elastomer materials, natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), halogenated butyl rubber (IIR), acrylonitrile-butadiene rubber (NBR), ethylene-propylene-diene rubber (EPDM) Etc. When the elastomer material is used, the adhesion of the tire inner surface protectors 10 and 20 to the pneumatic tire T is improved, and the durability when repeatedly used is also improved.

  Moreover, in order to protect the sound absorbing material 4 from ultraviolet rays, the tire inner surface protectors 10 and 20 are preferably black with low ultraviolet transmittance. Moreover, you may apply | coat a ultraviolet blocker to the tire inner surface protectors 10 and 20, or may affix a ultraviolet blocking film.

  In a state where the tire inner surface protectors 10 and 20 are mounted on the pneumatic tire T, the amount of ultraviolet rays on the tire inner surface is preferably 3% or less with respect to the amount of ultraviolet rays outside the pneumatic tire T. In other words, the ultraviolet ray blocking rate based on the tire inner surface protectors 10, 20 is preferably 97% or more. This finding is based on the results of tests conducted by the present inventors.

In other words, an ultraviolet sensor is installed on the inner surface of the tire together with a sound absorbing material made of urethane foam so that the amount of ultraviolet light on the inner surface of the tire can be measured, and a tire inner surface protector is attached to the pneumatic tire, The ultraviolet ray set at the position was irradiated with ultraviolet rays having a wavelength of 302 nm and 1730 μW / cm ² and left for 3 months. Thereafter, the sound absorbing material made of urethane foam was removed from the inner surface of the tire, and the reduction rate of the tear strength before and after the test of the urethane foam was determined.

  As a result, when the ultraviolet ray amount on the tire inner surface was 5% of the ultraviolet ray amount outside the tire, the reduction rate of the tear strength was 12%, whereas the ultraviolet ray amount on the tire inner surface was 3% of the ultraviolet ray amount outside the tire. It was found that the tear strength reduction rate was 5% at a certain time, and that a slight difference in the amount of ultraviolet rays greatly affected the tear strength reduction rate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a meridian cross-sectional view showing a tire inner surface protector and a pneumatic tire as reference examples for explaining the present invention. It is a side view which shows the tire inner surface protector of FIG. 1, and a pneumatic tire. FIG. 4 is a meridian cross-sectional view showing a tire inner surface protector and a pneumatic tire as another reference example for explaining the present invention. 1 is a meridian cross-sectional view showing a tire inner surface protector and a pneumatic tire according to an embodiment of the present invention. It is a meridian cross-sectional view showing a tire inner surface protector and a pneumatic tire according to another embodiment of the present invention. FIG. 6 is a plan view showing the tire inner surface protector and the pneumatic tire of FIG. 5 as seen from the tire inner side. FIG. 5 is a meridian cross-sectional view showing a tire inner surface protector and a pneumatic tire according to still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Sound-absorbing material 5 Tire cavity part 10, 20 Tire inner surface protector 11 Ring body 21 Rod-shaped body T Pneumatic tire

Claims (7)

A pneumatic tire that uses a tire inner surface protector having flexibility and a structure that can be inserted into the tire cavity, and stores the pneumatic tire before assembling the rim in a state in which the tire inner surface protector is inserted into the tire cavity. In the storage method of
A plurality of flexible annular bodies are used as the tire inner surface protector, the plurality of annular bodies are inserted into the tire cavity so as to be aligned in the tire width direction, and the annular bodies are paired with a pair of pneumatic tires. A pneumatic tire storage method, wherein the pneumatic tire is arranged so as to be sandwiched between bead portions . In the state where the outer diameter of the annular body is larger than the inner diameter of the bead portion of the pneumatic tire, the inner diameter of the annular body is smaller than the inner diameter of the bead portion of the pneumatic tire, and the annular body is inserted into the tire cavity The pneumatic tire storage method according to claim 1, wherein the pneumatic tire abuts against the bead portions on both sides.   The pneumatic tire storage method according to claim 2, wherein the annular body has a hollow structure made of a polymer material. A pneumatic tire that uses a tire inner surface protector having flexibility and a structure that can be inserted into the tire cavity, and stores the pneumatic tire before assembling the rim in a state in which the tire inner surface protector is inserted into the tire cavity. In the storage method of
Using a rod-like body having flexibility greater than the inner circumferential length of the tread portion of the pneumatic tire as the tire inner surface protection, and disposed along the inner surface of the tire by spirally winding a rod-shaped body within the tire cavity A method for storing a pneumatic tire, characterized in that a plurality of circumferential portions of the rod-shaped body are arranged in a tire width direction .   The pneumatic tire storage method according to claim 4, wherein the rod-shaped body has a hollow structure made of a polymer material.   The method for storing a pneumatic tire according to claim 3 or 5, wherein the polymer material is a thermoplastic resin.   6. The pneumatic tire storage method according to claim 3, wherein the polymer material is an elastomer material.

Images