JP3848964B1 - Tire filling gas and gas filled tire / rim assembly - Google Patents
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Abstract
【課題】 タイヤ組立体の内圧低下(ガス漏れ)を従来技術に比較して格段に抑制できるタイヤ充填用ガス並びに該ガスが充填されてなるガス充填タイヤ・リム組立体の提供。
【解決手段】 アルゴンガスと窒素ガスとからなる不活性の2種混合ガスであって、上記混合ガスの体積比率は、ガス漏れ率が窒素単体の漏れ率よりも小さくなる特定の範囲であり、好ましくは2.5〜10vol%のアルゴンガスを含有していることを特徴とするタイヤ充填用ガスである。また、チューブレスタイヤ1を対応リム6に装着してなるタイヤ・リム組立体の内部空間部分に、アルゴンガスと窒素ガスとからなり、上記混合ガスの体積比率は、ガス漏れ率が窒素単体の漏れ率よりも小さくなる特定の範囲であり、好ましくは2.5〜10vol%のアルゴンガスを含有する不活性の2種混合ガスを充填してなることを特徴とするガス充填タイヤ・リム組立体である。
【選択図】 図1
PROBLEM TO BE SOLVED: To provide a tire filling gas capable of remarkably suppressing a decrease in internal pressure (gas leakage) of a tire assembly as compared with a conventional technique and a gas filled tire / rim assembly filled with the gas.
An inert two-type mixed gas composed of argon gas and nitrogen gas, wherein the volume ratio of the mixed gas is a specific range in which the gas leakage rate is smaller than the leakage rate of nitrogen alone, Preferably, the tire filling gas contains 2.5 to 10 vol% argon gas. Further, an inner space portion of a tire / rim assembly formed by mounting the tubeless tire 1 on the corresponding rim 6 is composed of argon gas and nitrogen gas, and the volume ratio of the mixed gas has a gas leakage rate of leakage of nitrogen alone. A gas-filled tire / rim assembly characterized in that it is in a specific range smaller than the ratio, and is preferably filled with an inert gas mixture containing 2.5 to 10 vol% of argon gas. is there.
[Selection] Figure 1
Description
本発明は、乗用車やトラック、レーシングカー等の車両や航空機等の自走式機器のタイヤに充填するためのタイヤ充填用ガスに関し、また、タイヤ内圧の長期安定化を果たすべく前述のタイヤ充填用ガスを充填してなるガス充填タイヤ・リム組立体に関する。 The present invention relates to a tire filling gas for filling a tire of a self-propelled device such as a vehicle such as a passenger car, a truck, a racing car, and an aircraft, and also for the above-mentioned tire filling to achieve long-term stabilization of the tire internal pressure. The present invention relates to a gas-filled tire / rim assembly formed by filling gas.
タイヤ充填用ガスとしては、伝統的に空気が使用されているが、近時、高速走行や過酷な走行を強いられるレーシングカーや航空機等の特殊タイヤのみならず乗用車等の一般的なタイヤにも空気以外のガスを充填することが提案されている(例えば特許文献1及び特許文献2参照。) Air is traditionally used as a tire filling gas, but recently it is used not only for special tires such as racing cars and aircraft that are forced to drive at high speeds and severely, but also for general tires such as passenger cars. It has been proposed to fill a gas other than air (see, for example, Patent Document 1 and Patent Document 2).
特許文献1に記載のタイヤ充填用ガスは、ヘリウムガスと窒素ガスとからなる不活性の2種混合ガスであって、20〜45vol%のヘリウムガスを含有しているものである。これは、ヘリウムガス特有の優位性、即ち、窒素ガスに比して熱伝導率が高く、比熱が極めて低いとされる点を担保しつつ、タイヤ充填用ガスとしての致命的な欠点であるタイヤゴム層に対する浸透性が極めて高い点を可及的に排除することを意図したものである。 The tire filling gas described in Patent Document 1 is an inert two-type mixed gas composed of helium gas and nitrogen gas, and contains 20 to 45 vol% helium gas. This is a tire rubber which is a fatal defect as a tire filling gas while ensuring the superiority peculiar to helium gas, that is, that the heat conductivity is higher than that of nitrogen gas and the specific heat is extremely low. It is intended to eliminate as much as possible the very high permeability to the layer.
また、特許文献2に記載のタイヤ充填用ガスは、分子中に炭素原子とフッ素原子とを含有する気体の一部をアルゴン又は窒素で置換したものである。これは、タイヤゴム層に対する浸透性が低いガスを充填することで、タイヤ組立体の内圧低下を抑制することを意図したものである。また、特許文献2中の段落「0023」には、「アルゴンは窒素や酸素に比べて分子量が大きいので、ゴムへの浸透・透過を低減する観点からタイヤ・リム組立体内部に充填する気体として好ましい。」との記載がある。
上記特許文献1及び2に記載のタイヤ充填用ガス(以下、従来技術という)は、従前のものよりは優れているが、タイヤ組立体の内圧低下を抑制する点ではなお不十分である。しかも、上記特許文献2中の段落「0023」の記載は誤認に基づくものであり、アルゴンガス単体のガス漏れ率は空気よりも大きいことが、本発明者が行った実験により確認されている(表1参照)。従って、本発明はこのような事情を考慮してなされたもので、その目的は、タイヤ組立体の内圧低下(ガス漏れ)を従来技術に比較して格段に抑制できるタイヤ充填用ガス並びに該ガスが充填されてなるガス充填タイヤ・リム組立体を提供することにある。 Although the tire filling gas described in Patent Documents 1 and 2 (hereinafter referred to as the prior art) is superior to the conventional one, it is still insufficient in terms of suppressing a decrease in internal pressure of the tire assembly. Moreover, the description of paragraph “0023” in Patent Document 2 is based on misidentification, and it has been confirmed by experiments conducted by the present inventors that the gas leakage rate of the argon gas alone is larger than that of air ( (See Table 1). Accordingly, the present invention has been made in view of such circumstances, and the object thereof is to provide a tire filling gas and a gas that can significantly suppress a decrease in internal pressure (gas leakage) of the tire assembly as compared with the prior art. It is an object to provide a gas-filled tire / rim assembly filled with a gas.
本発明は上記課題を解決するために鋭意研究の結果なされたもので、以下の知見に基づく。本発明者は、アルゴンガスと窒素ガスとからなる不活性の2種混合ガスであって、特定の体積比率の範囲では、空気単独又は窒素ガス単独の場合よりもガス漏れ率が小さくなることを見出すに至った。 The present invention has been made as a result of intensive studies to solve the above problems, and is based on the following findings. The inventor is an inert two-type mixed gas composed of argon gas and nitrogen gas, and in a specific volume ratio range, the gas leakage rate is smaller than that of air alone or nitrogen gas alone. I came to find it.
即ち、請求項1に記載のタイヤ充填用ガスは、アルゴンガスと窒素ガスとからなる不活性の2種混合ガスであって、上記2種混合ガスの体積比率は、2.5〜10vol%のアルゴンガスを含有することを特徴とする。 That is, the tire filling gas according to claim 1 is an inert two-type mixed gas composed of argon gas and nitrogen gas, and the volume ratio of the two-type mixed gas is 2.5 to 10 vol%. Argon gas is contained .
又、請求項2に記載の発明はガス充填タイヤ・リム組立体であって、チューブレスタイヤ1を対応リム6に装着してなるタイヤ・リム組立体の内部空間部分に、アルゴンガスと窒素ガスとからなる不活性の2種混合ガスを充填してなり、上記2種混合ガスの体積比率は、2.5〜10vol%のアルゴンガスを含有することを特徴とする。 The invention according to claim 2 is a gas-filled tire / rim assembly, wherein an argon gas, a nitrogen gas, It is characterized by being filled with an inert two-type mixed gas comprising, and the volume ratio of the two-type mixed gas contains 2.5 to 10 vol% argon gas.
本発明では、アルゴンガスと窒素ガスとからなる不活性の2種混合ガスで、上記混合ガスの特定の体積比率の範囲、即ち、ガス漏れ率が窒素単体の漏れ率よりも小さくなる特定の範囲であり、より好ましくは2.5〜10vol%のアルゴンガスを含有しているタイヤ充填用ガスであり、また、このタイヤ充填用ガスを充填してなるガス充填タイヤ・リム組立体であって、かかる不活性の2種混合ガスを使用する場合に限り、空気単独又は窒素ガス単独の場合に比してガス漏れ率が極めて少ない。これにより、タイヤ組立体の内圧低下(ガス漏れ)を従来技術よりも格段に抑制することができるのである。 In the present invention, an inert two-type mixed gas composed of argon gas and nitrogen gas, a specific volume ratio range of the mixed gas, that is, a specific range in which the gas leakage rate is smaller than the leakage rate of nitrogen alone. More preferably, a gas for filling tires containing 2.5 to 10 vol% of argon gas, and a gas-filled tire / rim assembly formed by filling the gas for filling tires, Only when such an inert two-type mixed gas is used, the gas leakage rate is extremely small as compared with the case of air alone or nitrogen gas alone. Thereby, the internal pressure fall (gas leak) of a tire assembly can be suppressed markedly rather than a prior art.
これにより、本発明は以下のような優れた実用的な効果を奏する。即ち、(イ)不活性の2種混合ガスが齎す内圧長期安定保持作用に伴って、車両や航空機等の自走式機器の安定走行・燃費向上に繋がる。(ロ)不活性の2種混合ガス自体がリム等の腐食・酸化・劣化等の防止に寄与する。 Thereby, this invention has the following outstanding practical effects. That is, (a) along with the internal pressure long-term stable holding action of the inert two-type mixed gas, it leads to stable running and fuel efficiency improvement of self-propelled devices such as vehicles and aircrafts. (B) The inert two-type mixed gas itself contributes to prevention of corrosion, oxidation, deterioration, etc. of the rim.
以下、図面を参照して、本発明に係るガス充填タイヤ・リム組立体並びにタイヤ充填用ガスの詳細について説明する。図2は、本発明の実施の形態に係るタイヤ・リム組立体のタイヤ幅方向断面図である。図示のタイヤ・リム組立体は、中空ドーナツ状のチューブレスタイヤ1を対応リム6に装着してなるものであり、チューブレスタイヤ1と対応リム6とにより形成される組立体の内部空間部分には後述する不活性の2種混合ガスが充填される。 Hereinafter, the gas-filled tire / rim assembly and the tire filling gas according to the present invention will be described in detail with reference to the drawings. FIG. 2 is a sectional view in the tire width direction of the tire / rim assembly according to the embodiment of the present invention. The illustrated tire / rim assembly is formed by mounting a hollow donut-shaped tubeless tire 1 on a corresponding rim 6, and an inner space portion of the assembly formed by the tubeless tire 1 and the corresponding rim 6 is described later. Inactive two-type mixed gas is filled.
チューブレスタイヤ1は、外層部2と、この外層部2の内面に全面接着されたゴム等からなるインナーライナ層3とを有する。外層部2は、対応リム6に噛み込ませるためのビード部21と、地面に接するトレッド部22と、ビード部21とトレッド部22の間の領域であるサイドウォール部23とを有している。また、ビード部21、トレッド部22及びサイドウォール部23の内側には、チューブレスタイヤ1の形状を維持するためのカーカス24が設けられる。そして、トレッド部22とカーカス24との間には、トレッド部22の剛性を調整するための複数のベルト層25が設けられる。なお、符号26はリムバルブを示す。 The tubeless tire 1 has an outer layer portion 2 and an inner liner layer 3 made of rubber or the like adhered to the entire inner surface of the outer layer portion 2. The outer layer portion 2 includes a bead portion 21 for causing the corresponding rim 6 to be bitten, a tread portion 22 that is in contact with the ground, and a sidewall portion 23 that is a region between the bead portion 21 and the tread portion 22. . A carcass 24 for maintaining the shape of the tubeless tire 1 is provided inside the bead portion 21, the tread portion 22, and the sidewall portion 23. A plurality of belt layers 25 for adjusting the rigidity of the tread portion 22 are provided between the tread portion 22 and the carcass 24. Reference numeral 26 denotes a rim valve.
上述する構造を備えるタイヤ・リム組立体の内部に充填されてなる上記2種混合ガスは、アルゴンガスと窒素ガスとからなる不活性のガスである。なお、窒素ガス単独の方が空気の場合に比してゴムに対する透過性が低いことは既に知られており、アルゴンガス単独のゴムへの透過性が空気に比べて高いことが、本発明者が行った実験により確認されている(表2参照)。 The above-mentioned two kinds of mixed gas filled in the tire / rim assembly having the above-described structure is an inert gas composed of argon gas and nitrogen gas. In addition, it is already known that nitrogen gas alone has a lower permeability to rubber than air, and the present inventors have a higher permeability to rubber of argon gas alone than air. (See Table 2).
かかる知見に基づいて、充填すべき混合ガスにおけるアルゴンガスと窒素ガスとの混合比について、実用面並びに経済面での得失等を考慮しながら通常空気と比較の上で種々の実験を行うことにより、下記の実施例に記載のテスト結果から好適な条件を見出すに至ったのである。 Based on this knowledge, by conducting various experiments on the mixing ratio of argon gas and nitrogen gas in the mixed gas to be filled, comparing with normal air while taking into consideration the advantages and disadvantages in practical and economic aspects. The inventors have found suitable conditions from the test results described in the following examples.
先ず、定温の室内において、充填すべき混合ガスにおけるアルゴンガスと窒素ガスの混合ガスの体積比率、即ち、アルゴン濃度を0〜100%と変えて、ラボテストによりタイヤ圧の変化(漏れ率)を温度補正の下で測定した。その結果は、下記表1に示す通りである。 First, in a constant temperature room, the volume ratio of the mixed gas of argon gas and nitrogen gas in the mixed gas to be filled, that is, the argon concentration is changed from 0 to 100%, and the change in tire pressure (leakage rate) is measured by the laboratory test. Measured under correction. The results are as shown in Table 1 below.
上記表1の試験結果に基づく漏れ率の動態をグラフに表したものを図1に示した。表1及び図1を参照して漏れ率の変化を観察する。空気のみを充填したときの漏れ率を100とし、アルゴンガスと窒素ガスとの混合ガスを充填してアルゴン濃度(%,in窒素ガス)を変えた場合には、特定の体積比率の範囲では空気や窒素に比べ洩れ率の高いアルゴンガスが含むにもかかわらず、窒素単独の場合よりも漏れ率が小さくなることが判明した。つまり、ガス漏れ率が窒素単体の漏れ率よりも小さくなる特定の体積比率の範囲で本発明に係る混合ガスはタイヤ充填用ガスとして効果的に機能する。 A graph showing the dynamics of the leakage rate based on the test results in Table 1 is shown in FIG. The change in the leakage rate is observed with reference to Table 1 and FIG. When the leak rate when only air is filled is 100, and the argon gas concentration (%, in nitrogen gas) is changed by filling a mixed gas of argon gas and nitrogen gas, the air in a specific volume ratio range In spite of containing argon gas, which has a higher leak rate than nitrogen and nitrogen, the leak rate was found to be smaller than that of nitrogen alone. That is, the mixed gas according to the present invention effectively functions as a tire filling gas within a specific volume ratio range in which the gas leakage rate is smaller than the leakage rate of nitrogen alone.
特定の体積比率の範囲とは、表1及び図1に示される如く、アルゴン濃度がゼロを超えておよそ31%近傍の範囲までを指す。この範囲ではガス漏れ率が窒素単体の漏れ率よりも小さくなる。さらに詳細には、アルゴン濃度(%,in窒素ガス)5%で漏れ率が34と最少となり、しかもその前後数%(2.5〜10%)の領域では漏れ率が格段に小さい範囲となっていることが判明した。 As shown in Table 1 and FIG. 1, the specific volume ratio range refers to a range where the argon concentration exceeds zero and is approximately 31%. In this range, the gas leakage rate is smaller than that of nitrogen alone. More specifically, when the argon concentration (%, in nitrogen gas) is 5%, the leakage rate is 34 and the leakage rate is minimum, and in the range of several percent (2.5 to 10%) before and after the leakage rate, the leakage rate is extremely small. Turned out to be.
以上の結果からして、充填すべき混合ガスにおけるアルゴンガスと窒素ガスの混合ガスの特定の体積比率、即ち、アルゴン濃度がゼロを超えておよそ31%近傍の範囲では窒素ガス単体よりも漏れ率が小さく、アルゴン濃度が5%前後の2.5〜10%の範囲において窒素ガス単体よりも漏れ率がより一層小さくなることが分かった。かくして特定の体積比を持つアルゴンガスと窒素ガスからなる不活性の2種混合ガスがタイヤ・リム組立体に対する内圧保持性の向上に十分資することが明らかである。 Based on the above results, the specific volume ratio of the mixed gas of argon gas and nitrogen gas in the mixed gas to be filled, that is, the leakage rate is higher than that of nitrogen gas alone in the range where the argon concentration exceeds zero and is approximately 31%. It was found that the leakage rate was much smaller than that of nitrogen gas alone in the range of 2.5 to 10%, where the argon concentration was around 5%. Thus, it is clear that the inert two-mixed gas composed of argon gas and nitrogen gas having a specific volume ratio contributes sufficiently to the improvement of the internal pressure retention for the tire / rim assembly.
ところで、アルゴンガスと窒素ガスとの混合ガスをタイヤ・リム組立体に充填する際には、その内部に不可避的に残留する空気(特に酸素)の割合を可能な限り下げる必要がある。そこで、上記混合ガスを一度充填した後、一旦このガスを抜いて、再度この混合ガスを充填する工程を一回以上実施することが望ましい。つまり、現実問題としてタイヤ・リム組立体内に不可避的に残留する空気は、本発明における「充填」には該当しない。従って充填を意図しない微量の空気等がタイヤ・リム組立体内に残留する場合も、本発明の技術的範囲から排除するものではない。 By the way, when filling the tire / rim assembly with a mixed gas of argon gas and nitrogen gas, it is necessary to reduce the ratio of air (especially oxygen) inevitably remaining in the tire / rim assembly as much as possible. Therefore, it is desirable to carry out the process of once filling the mixed gas and then removing the gas once and filling the mixed gas again once or more. That is, air that inevitably remains in the tire / rim assembly as a practical problem does not correspond to “filling” in the present invention. Accordingly, even if a minute amount of air or the like that is not intended for filling remains in the tire / rim assembly, it is not excluded from the technical scope of the present invention.
次いで、窒素ガス単独、アルゴンガス単独、窒素ガスとアルゴンガスとの混合ガスのゴムシートによる透過度を測定した。その結果は下記表2に示す通りである。ただし、透過度についてはゴムシートでの試験であり、そのままタイヤでのエア漏れ率に換算出来るものではないが、定性的な傾向を示すものである。 Subsequently, the permeability | transmittance by the rubber sheet of nitrogen gas single, argon gas single, and the mixed gas of nitrogen gas and argon gas was measured. The results are as shown in Table 2 below. However, the permeability is a test with a rubber sheet and cannot be directly converted into an air leak rate with a tire, but shows a qualitative tendency.
この表2によれば、混合ガス(窒素95%+アルゴン5%)では窒素単独の場合よりもゴムシートに対する透過度が低いことが明確である。これは混合ガスのゴム透過度が当該ガスの混合比によって影響を受ける事を示すもので、窒素とアルゴンの溶解度の相違に起因するものと思われる。前記定性的な傾向は前記混合ガスの特定の体積比率で漏れ率が小さくなることと整合する。 According to Table 2, it is clear that the permeability to the rubber sheet is lower in the mixed gas (nitrogen 95% + argon 5%) than in the case of nitrogen alone. This indicates that the rubber permeability of the mixed gas is affected by the mixing ratio of the gas, and is considered to be due to the difference in solubility between nitrogen and argon. The qualitative tendency is consistent with a decrease in leakage rate at a specific volume ratio of the mixed gas.
以上、タイヤ・リム組立体に基づき本発明を説明したが、本発明に係る不活性の2種混合ガスは、タイヤ等に限らなく、例えば港湾の埠頭で用いられるゴム製中空柱形状の防舷物に対する充填ガスにも好適に利用されるものである。 As described above, the present invention has been described based on the tire / rim assembly. However, the inert two-type mixed gas according to the present invention is not limited to a tire or the like, but is, for example, a rubber hollow column-shaped fender used at a harbor pier. It is also suitably used as a filling gas for objects.
1…チューブレスタイヤ、6…対応リム。 1 ... Tubeless tire, 6 ... Corresponding rim.
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WO2019022143A1 (en) | 2017-07-28 | 2019-01-31 | ヤマハファインテック株式会社 | Wheeled tire, and method for producing wheeled tire |
WO2019021822A1 (en) | 2017-07-28 | 2019-01-31 | ヤマハファインテック株式会社 | Tire inspection device and tire inspection method |
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