JP4047959B2 - Segment tire - Google Patents
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- JP4047959B2 JP4047959B2 JP02780598A JP2780598A JP4047959B2 JP 4047959 B2 JP4047959 B2 JP 4047959B2 JP 02780598 A JP02780598 A JP 02780598A JP 2780598 A JP2780598 A JP 2780598A JP 4047959 B2 JP4047959 B2 JP 4047959B2
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- 229920001971 elastomer Polymers 0.000 claims description 49
- 239000005060 rubber Substances 0.000 claims description 49
- 239000000463 material Substances 0.000 claims description 29
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 239000006229 carbon black Substances 0.000 claims description 10
- 239000011796 hollow space material Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000004636 vulcanized rubber Substances 0.000 claims description 5
- 150000001993 dienes Chemical class 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 10
- 230000020169 heat generation Effects 0.000 description 9
- 238000009472 formulation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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Description
【0001】
【発明の属する技術分野】
本発明は建設機械や土木作業機械等の車輪に取り付けられるセグメントタイヤに関するものである。
【0002】
【従来の技術】
従来のセグメントタイヤは、トレッド部(A)とホイ−ル取り付け部(B)とこの間を渡す側部(C)とこれらに囲まれた中空空間部(D)とこの中空空間部内に底部(E)より立ち上がるストッパ−部(F)とで構成されており、ホイ−ル部(G)に多数のセグメントタイヤがボルト固定されて車輪を形成して走行に供されている。
【0003】
図1はこのセグメントタイヤの一例を示すものであるが、静止状態では通常は機体の重量を側部(C)のみにて受け持ち、中空空間部(D)とストッパ−部(F)とは接触しない構造とされ、走行或いは各種作業時において大きな荷重が掛かった場合には側部(C)の変形にてこれを吸収してオペレ−タ−に対する振動等を軽減し、掘削作業等の大入力に対しては中空空間部(D)とストッパ−部(F)とが接触してセグメントのこれ以上の変形を阻止する構造とされている。
【0004】
しかるに、この種セグメントタイヤの使用は外傷を受け易い場所での使用が多いため、セグメントタイヤの耐久性能の向上が要請されている。この耐久性の向上には耐カット性、耐久カット貫通性の向上が不可欠であり、これらの改良のために一般にはゴム材料の硬度を上げることが考えられている。
【0005】
【発明が解決しようとする課題】
しかしながら、セグメントタイヤ全体のゴム硬度を上げて耐久性を向上させようとする場合には、高速での連続走行時にはセグメントタイヤの側部からの発熱が大きくなり、この部位が破壊するおそれがあった。
【0006】
そこで本発明はセグメントタイヤを構成する各部位のゴム材料を適切に配置し、特にトレッド部の耐カット性の向上と共に、側部の発熱の防止(低発熱性)を実現したセグメントタイヤを提供するものである。
【0007】
【課題を解決するための手段】
本発明のセグメントタイヤは以上の課題を解決するためになされたものであって、その要旨は、トレッド部(A)と、ホイ−ル取り付け部(B)と、この間を渡す側部(C)と、これらに囲まれた中空空間部(D)と、から構成されるセグメントタイヤであって、トレッド部(A)を構成する加硫ゴムの、動的損失率(E”)が30kgf/cm2 以上であり、かつ、ハイスチレンポリマーの配合量が5〜40重量部であるSBRの配合量が60〜100重量部であって、側部(C)の加硫ゴム材料の損失正接(以下、tanδで表す)(25℃)が0.25以下であり、動的弾性率(E’)が150kgf/cm2 以上であり、かつ粒子径25μm以上のカーボンブラックの配合量が50〜80重量部のゴム材料を用いたセグメントタイヤを提供するものである。
【0008】
そしてトレッド部(A)のゴム材料としては、SBR60〜100重量部とその他のジエン系ポリマ−40〜0重量部をブレンドしたゴム部100重量部に対し、粒子径50μm以下のカ−ボンブラックを40〜100重量部を加えたものである。
【0009】
一方側部(C)のゴム材料としては、NR60〜100重量部とその他のジエン系ポリマ−40〜0重量部をブレンドしたゴム部100重量部に対し、粒子径25μm以上のカ−ボンブラックを50〜80重量部を加えたものである。
【0010】
尚、通常のセグメントタイヤはトレッド部(A)と側部(C)と底部(E)とは一体に構成されているが、これには限定されないことは勿論であり、例えば、底部(E)が切り離されており、これよりストッパ−部(F)が立ち上がる構造としてもよく、場合によっては底部(E)が欠落した構造で、ストッパ−部(F)はホイ−ル部より立ち上がっていてもよい。又、底部(E)にボルト等を埋め込んでホイ−ル取り付け部(B)としてもよいことは勿論である。
【0011】
【発明の実施の形態】
本発明のセグメントタイヤは、セグメントタイヤを構成する各部位の機能を分析し、これに相応しいゴム材料を用いたことによってなるものであり、そのトレッド部(A)には耐カット性に優れたゴム材料を用い、一方、側部(C)には低発熱性で高弾性ゴム材料を用いたことによって従来の課題を解決しようとするものである。特に発熱性については、tanδ値とよく対応するもので、セグメントタイヤの側部の発熱を抑えるためには側部のtanδ(25℃)値を0.25以上とすることが好ましい。
【0012】
トレッド部(A)に要求される耐カット性とゴム材料の加硫ゴムのE″(E′×tanδ)値との間に相関関係があることが判明し、E″の値が大きくなるにつれてこれらの特性が優れていることが分かった。このため、トレッド部(A)のゴム材料の特性値を特定したものである。
【0013】
一方、E′は走行時のゴム材料の変形量に対する指標となり、又、tanδ値は走行時岩石から受ける衝撃エネルギ−をどの程度ゴム材料が吸収するか(低発熱性)の指標となる。このため、側部(C)のゴム材料の特性値を特定したものである。
【0014】
動的弾性率(E’)が低いことは、ゴムクロ−ラの剛性が弱く変形が大きくなることとなり、高速走行時の機体の支持がしにくくなる。又、この値が高くてもtanδが高いと発熱が大きくなってしまう。従って、特に側部ゴムにはtanδが低くE’が高いゴム材料が好んで用いられるものである。
【0015】
一方、動的損失率(E”)と耐カット性の関係は相関関係があり、E”を大きくすると耐カット性が向上するものであり、E”を大きくすることによりセグメントタイヤのトレッド部の耐久性が向上することとなる。
従って、これらの特性即ちE’、E”、tanδの好ましい値を得るためにゴム材料も特定されるのが好ましく、前記したようにトレッド部(A)及び側部(C)を構成するゴム材料が決定されるものである。
【0016】
ここで使用されるSBRは、乳化重合タイプと溶液重合タイプがあるが、そのどちらでも使用が可能である。一方、上記SBR或いは側部(C)のゴム材料にブレンドするジエン系ポリマ−としては、天然ゴム、ポリブタジエンゴム、NBR、イソプレンゴム等及びこれらの混合物が好適に用いられる。
【0017】
又、ハイスチレンポリマ−は、スチレンコンテントが50%以上のポリマ−のものであり、該ポリマ−としては特に限定されないが、好ましくはハイスチレンSBRが好適に用いられる。また、その配合量は、ゴム組成物100重量部の内、0重量部以上、好ましくは5〜40重量部を限度としてハイスチレンポリマ−に置換使用することがE″向上のために好ましく、中でも5〜20重量部が好適である。ハイスチレンポリマ−の置換部数が5重量部以下の置換では、E′(E″)を向上させる効果がやや少なく耐カット性の改善効果が小さい。一方、40重量部以上を上記ブレンドしたゴム組成物100重量部の内置換使用した場合は、混練り作業が著しく低下すると共に、引張強度も低下する。
【0018】
上記スチレンコンテント50%以上のハイスチレンポリマ−が本発明において使用されたのは、通常使用温度付近でtanδが高く、かつ、高弾性率の配合が得られ、E″が大きいからである。
【0019】
トレッド部(A)にもちいられるゴム材料の補強剤としては上記の如く粒子径が50μm以下の微細なカ−ボンブラック(FEF級以上)が望ましく、それ以上の大きい粒子径を有するカ−ボンブラックでは補強性に難がある。又、カ−ボン量はブレンドしたゴム100重量部に対し、40〜100重量部の範囲が望ましく、より好ましくは60〜80重量部が好適である。40重量部ゴム以下ではゴム補強性が弱く又カット性も劣り、100重量部以上では混練り作業性が難かしくなる。
【0020】
側部Cの補強剤としては粒子径が25μm以上のカ−ボンブラック(HAF級以下)を40〜100重量部、好ましくは50〜80重量部加えたものである。この粒子径を限定したのはカ−ボンブラックの粒子径は小さい程補強性が高く、引張特性等について良好ではあるが、同時にtanδ値も高くなってしまう。この点で、粒子径が25μm以上であれば、tanδの値もさほど高くならず低発熱であり側部Cのゴムに好適となるものである。
【0021】
尚、側部Cとトレッド部Aの分割面は適宜選択されるものであって、走行時セグメントタイヤの変形量の大きい場所には側部用ゴムを、路面と接触し耐カット性が要求される部位にはトレッド部用ゴムを用いることになる。
【0022】
ゴム材料のE′(E″)を向上させる手段として、カ−ボンブラックの他、カ−ボンとシリカ、或いはナイロン、ケブラ−、ビニロン等のカットファイバ−、ポリプロピレン等の樹脂を併用することもできるが、本発明で使用するハイスチレンポリマ−を採用した方がより効果が大きい。
【0023】
尚、本発明のゴム材料においては加硫剤、加硫促進剤、老化防止剤、粘着付与剤等が適宜配合される。又、本発明のゴム材料は、上記成分を通常の加工装置、例えばロ−ル、バンバリ−ミキサ−、ニ−ダ−等により混練りすることにより得られることは言うまでもない。
【0024】
【実施例】
以下、本発明のゴムクロ−ラを実施例をもって更に詳細に説明する。
図1におけるセグメントタイヤにあって、トレッド部(A)及び側部(C)のゴム材料の配合を表1に示す。
尚、E’、E”、tanδの測定結果も表1に示す。tanδは東洋精機製レオグラフ「ソリッドL−1R」を用いて動歪振幅2.0%、振動15Hz、測定温度25℃にて測定した。
【0025】
【表1】
【0026】
表1の配合例の内、特にセグメントタイヤのA部に好適なものは配合例3、4、6であり、C部に好適なものは5、7である。
【0027】
(実車試験)
(a) 耐久性試験
セグメントタイヤのA部に表1における配合例1〜4を選択し、C部に配合例5を選択して悪路耐久試験を行った。試験後の耐カット性、摩耗性、ゴム掛け等について観察した。結果を表2に示す。
【0028】
(b) 発熱試験
セグメントタイヤのA部に表1における配合例3を選択し、C部に配合例1、5、6、7を選択して高速走行時のC部の発熱を測定した。アスファルト路面を60km/hrで1時間連続走行し、C部の内部温度を測定した。結果を表2に示す。
【0029】
【表2】
【0030】
表中、◎は好結果をもたらすもの、○は実用に供せるもの、△は実用上問題があるもの、×は実用に供し得ないものとして判断した。
【0031】
試験(a) の結果より、A部のゴムの性状として、SBRを主成分とするE”が30kgf/cm2 以上のゴムが耐久性のよいことが証明された。
一方、試験(b) より、C部のゴムとして、E’の低いゴム(配合例1)はtanδが低いにもかかわらず剛性が弱く不具合であり、又発熱も大きい。一方、tanδの高いゴム(配合例6)はE’が高いが発熱が大きくて使用に供し得ないことが証明された。このことより、機体を支えるC部のゴムとしてE’が150kgf/cm2 以上、tanδが0.25以下のゴムが好適であることが証明された。
【0032】
【発明の効果】
本発明のセグメントタイヤにおいて、トレッド部と側部とのゴム材料を特定したものであって、従来のセグメントタイヤに比べて耐カット性に優れた、しかも側部のゴム材料は低発熱性で高弾性ゴム材料を用いたことによって従来の課題を解決したものである。
【図面の簡単な説明】
【図1】図1はセグメントタイヤの断面図を示す。
【符号の説明】
A‥‥トレッド部、
B‥‥ホイ−ル取り付け部、
C‥‥側部、
D‥‥中空空間部、
E‥‥底部、
F‥‥ストッパ−部、
G‥‥ホイ−ル部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment tire attached to a wheel of a construction machine or a civil engineering machine.
[0002]
[Prior art]
A conventional segment tire has a tread portion (A), a wheel mounting portion (B), a side portion (C) passing between them, a hollow space portion (D) surrounded by them, and a bottom portion (E ) And a stopper portion (F) that rises more, and a number of segment tires are bolted to the wheel portion (G) to form wheels to be used for traveling.
[0003]
FIG. 1 shows an example of this segment tire. In the stationary state, the weight of the airframe is usually handled only by the side portion (C), and the hollow space portion (D) and the stopper portion (F) are in contact with each other. When a large load is applied during traveling or various operations, it is absorbed by the deformation of the side part (C) to reduce vibrations to the operator and make a large input for excavation work etc. In contrast, the hollow space portion (D) and the stopper portion (F) are in contact with each other to prevent further deformation of the segment.
[0004]
However, since this type of segment tire is often used in a place where it is easily damaged, there is a demand for improvement in the durability performance of the segment tire. In order to improve the durability, it is indispensable to improve cut resistance and durability cut penetration, and it is generally considered to increase the hardness of the rubber material for these improvements.
[0005]
[Problems to be solved by the invention]
However, when trying to improve the durability by increasing the rubber hardness of the entire segment tire, the heat generated from the side of the segment tire increases during continuous running at high speed, and this part may be destroyed. .
[0006]
Accordingly, the present invention provides a segment tire in which the rubber material of each part constituting the segment tire is appropriately arranged, and in particular, the cut resistance of the tread portion is improved and the side portion is prevented from generating heat (low heat generation). Is.
[0007]
[Means for Solving the Problems]
The segment tire of the present invention has been made in order to solve the above problems, and the gist of the segment tire is a tread portion (A), a wheel mounting portion (B), and a side portion (C) passing between them. And a hollow space portion (D) surrounded by these segment tires, and the dynamic loss rate (E ″) of the vulcanized rubber constituting the tread portion (A) is 30 kgf / cm. 2 or more, and a blending amount of SBR amount of high styrene polymer is 5 to 40 parts by weight 60 to 100 parts by weight, the loss tangent of the vulcanized rubber material of the side (C) (hereinafter , Expressed by tan δ) (25 ° C.) is 0.25 or less, the dynamic elastic modulus (E ′) is 150 kgf / cm 2 or more, and the blending amount of carbon black having a particle diameter of 25 μm or more is 50 to 80 wt. Hisage segments tire using the rubber material parts It is intended to.
[0008]
As a rubber material of the tread part (A), carbon black having a particle diameter of 50 μm or less is used with respect to 100 parts by weight of a rubber part obtained by blending 60 to 100 parts by weight of SBR and 40 to 0 parts by weight of another diene polymer. Ru der plus 40-100 parts by weight.
[0009]
As the rubber material on one side (C), carbon black having a particle diameter of 25 μm or more is added to 100 parts by weight of a rubber part blended with 60 to 100 parts by weight of NR and 40 to 0 parts by weight of another diene polymer. 50 to 80 parts by weight are added.
[0010]
In the normal segment tire, the tread portion (A), the side portion (C), and the bottom portion (E) are integrally formed. However, the present invention is not limited to this. For example, the bottom portion (E) The stopper portion (F) may rise from this, and the bottom portion (E) may be omitted in some cases, and the stopper portion (F) may rise from the wheel portion. Good. Of course, a bolt or the like may be embedded in the bottom (E) to form a wheel mounting portion (B).
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The segment tire of the present invention is obtained by analyzing the function of each part constituting the segment tire and using a rubber material suitable for this, and the tread portion (A) has a rubber excellent in cut resistance. On the other hand, the conventional problem is solved by using a material having a low elasticity and a highly elastic rubber material for the side portion (C). In particular, the exothermicity corresponds well with the tan δ value, and in order to suppress the heat generation at the side portion of the segment tire, the tan δ (25 ° C.) value of the side portion is preferably set to 0.25 or more.
[0012]
It has been found that there is a correlation between the cut resistance required for the tread portion (A) and the E ″ (E ′ × tan δ) value of the rubber material vulcanized rubber, and as the value of E ″ increases. It was found that these characteristics are excellent. For this reason, the characteristic value of the rubber material of the tread portion (A) is specified.
[0013]
On the other hand, E ′ is an index for the amount of deformation of the rubber material during travel, and the tan δ value is an index of how much the rubber material absorbs impact energy received from the rock during travel (low heat generation). For this reason, the characteristic value of the rubber material of the side part (C) is specified.
[0014]
When the dynamic elastic modulus (E ′) is low, the rigidity of the rubber crawler is weak and the deformation becomes large, and it becomes difficult to support the airframe during high-speed traveling. Even if this value is high, if tan δ is high, heat generation will increase. Accordingly, a rubber material having a low tan δ and a high E ′ is preferably used for the side rubber.
[0015]
On the other hand, there is a correlation between the dynamic loss rate (E ") and the cut resistance. When E" is increased, the cut resistance is improved. By increasing E ", the tread portion of the segment tire is improved. Durability will be improved.
Accordingly, it is preferable that a rubber material is also specified in order to obtain preferable values of these characteristics, that is, E ′, E ″, and tan δ. As described above, the rubber material constituting the tread portion (A) and the side portion (C). Is determined.
[0016]
The SBR used here includes an emulsion polymerization type and a solution polymerization type, and either of them can be used. On the other hand, natural rubber, polybutadiene rubber, NBR, isoprene rubber, or a mixture thereof is preferably used as the diene polymer blended with the SBR or the rubber material of the side portion (C).
[0017]
The high styrene polymer is a polymer having a styrene content of 50% or more, and the polymer is not particularly limited, but high styrene SBR is preferably used. Further, the blending amount of the rubber composition is preferably 0 parts by weight or more, preferably 5 to 40 parts by weight, and is preferably replaced with a high styrene polymer in order to improve E ″. When the number of substituted parts of the high styrene polymer is 5 parts by weight or less, the effect of improving E ′ (E ″) is somewhat small and the effect of improving cut resistance is small. On the other hand, when 100 parts by weight of the rubber composition blended with 40 parts by weight or more is used, the kneading operation is remarkably lowered and the tensile strength is also lowered.
[0018]
The reason why the above-mentioned high styrene polymer having a styrene content of 50% or more is used in the present invention is that tan δ is high near the normal use temperature and a high elastic modulus compound is obtained, and E ″ is large.
[0019]
As the reinforcing material for the rubber material used in the tread portion (A), fine carbon black (FEF grade or more) having a particle size of 50 μm or less is desirable as described above, and carbon black having a larger particle size than that. Then there is difficulty in reinforcement. Further, the amount of carbon is desirably in the range of 40 to 100 parts by weight, more preferably 60 to 80 parts by weight with respect to 100 parts by weight of the blended rubber. If it is 40 parts by weight or less, the rubber reinforcing property is weak and the cut property is poor, and if it is 100 parts by weight or more, the kneading workability becomes difficult.
[0020]
As a reinforcing agent for the side portion C, 40 to 100 parts by weight, preferably 50 to 80 parts by weight of carbon black (HAF grade or less) having a particle size of 25 μm or more is added. This particle size is limited because the smaller the carbon black particle size, the higher the reinforcement and the better the tensile properties and the like, but at the same time, the tan δ value also increases. In this respect, if the particle diameter is 25 μm or more, the value of tan δ is not so high and the heat generation is low, which is suitable for the rubber of the side portion C.
[0021]
In addition, the division surface of the side part C and the tread part A is selected as appropriate, and the rubber for the side part is brought into contact with the road surface in a place where the deformation amount of the segment tire during traveling is large and cut resistance is required. The tread rubber is used for the part to be used.
[0022]
In addition to carbon black, carbon and silica, cut fibers such as nylon, kevlar and vinylon, and resins such as polypropylene may be used in combination as means for improving E ′ (E ″) of rubber materials. However, it is more effective to use the high styrene polymer used in the present invention.
[0023]
In the rubber material of the present invention, a vulcanizing agent, a vulcanization accelerator, an antiaging agent, a tackifier, and the like are appropriately blended. Needless to say, the rubber material of the present invention can be obtained by kneading the above components with an ordinary processing apparatus such as a roll, a Banbury mixer, a kneader or the like.
[0024]
【Example】
Hereinafter, the rubber track of the present invention will be described in more detail with reference to examples.
In the segment tire in FIG. 1, the composition of the rubber material of the tread portion (A) and the side portion (C) is shown in Table 1.
The measurement results of E ′, E ″, and tan δ are also shown in Table 1. Tan δ is a dynamic strain amplitude of 2.0%, vibration of 15 Hz, and measurement temperature of 25 ° C. using a Toyo Seiki rheograph “Solid L-1R”. It was measured.
[0025]
[Table 1]
[0026]
Of the blending examples in Table 1, blending examples 3, 4, and 6 are particularly suitable for the A part of the segment tire, and 5 and 7 are suitable for the C part.
[0027]
(Actual vehicle test)
(a) Durability Test A rough road endurance test was conducted by selecting Formulation Examples 1 to 4 in Table 1 for Part A and selecting Formulation Example 5 for Part C. The cut resistance, wear resistance, and rubber hooking after the test were observed. The results are shown in Table 2.
[0028]
(b) Exothermic Test Formulation Example 3 in Table 1 was selected for part A of the segment tire, and Formulation Examples 1, 5, 6, and 7 were selected for part C, and the heat generation at part C during high speed running was measured. The asphalt road surface was continuously traveled at 60 km / hr for 1 hour, and the internal temperature of part C was measured. The results are shown in Table 2.
[0029]
[Table 2]
[0030]
In the table, ◎ is judged to give a good result, ○ denotes a product that can be used practically, △ denotes a problem in practical use, and × denotes a product that cannot be used practically.
[0031]
From the result of the test (a), it was proved that the rubber having the E ″ as a main component of SBR of 30 kgf / cm 2 or more as the property of the rubber of the part A has good durability.
On the other hand, from the test (b), as the rubber of part C, the rubber having a low E ′ (formulation example 1) has a problem that the rigidity is weak and the heat generation is large although the tan δ is low. On the other hand, it was proved that rubber having a high tan δ (Formulation Example 6) had a high E ′ but a large heat generation and could not be used. From this, it was proved that a rubber having an E ′ of 150 kgf / cm 2 or more and a tan δ of 0.25 or less is suitable as the rubber of the part C supporting the airframe.
[0032]
【The invention's effect】
In the segment tire of the present invention, the rubber material of the tread part and the side part is specified, and the rubber material of the side part is superior in cut resistance as compared with the conventional segment tire, and the side part rubber material has low heat generation and high resistance. By using an elastic rubber material, the conventional problems are solved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a segment tire.
[Explanation of symbols]
A ... tread part,
B ... Wheel mounting part,
C ... side,
D: Hollow space,
E ... Bottom,
F ... Stopper part,
G ... Wheel part.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02780598A JP4047959B2 (en) | 1998-01-25 | 1998-01-25 | Segment tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02780598A JP4047959B2 (en) | 1998-01-25 | 1998-01-25 | Segment tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11208209A JPH11208209A (en) | 1999-08-03 |
| JP4047959B2 true JP4047959B2 (en) | 2008-02-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02780598A Expired - Fee Related JP4047959B2 (en) | 1998-01-25 | 1998-01-25 | Segment tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4047959B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6334374B2 (en) * | 2014-11-20 | 2018-05-30 | 株式会社ブリヂストン | Rubber composition for rubber crawler and rubber crawler |
-
1998
- 1998-01-25 JP JP02780598A patent/JP4047959B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11208209A (en) | 1999-08-03 |
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