JP2002248912A - Pneumatic radial tire for heavy duty load - Google Patents
Pneumatic radial tire for heavy duty loadInfo
- Publication number
- JP2002248912A JP2002248912A JP2001046330A JP2001046330A JP2002248912A JP 2002248912 A JP2002248912 A JP 2002248912A JP 2001046330 A JP2001046330 A JP 2001046330A JP 2001046330 A JP2001046330 A JP 2001046330A JP 2002248912 A JP2002248912 A JP 2002248912A
- Authority
- JP
- Japan
- Prior art keywords
- bead
- rim flange
- rim
- tire
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、航空機用タイヤ
等の、重荷重用空気入りラジアルタイヤ、なかでもそれ
のビード部構造の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy-duty pneumatic radial tire such as an aircraft tire, and more particularly to an improvement in a bead structure thereof.
【０００２】[0002]
【従来の技術】近年の航空機機体の大型化傾向の下で、
機体重量の増加に対処するためには、航空機用タイヤの
大型化あるいは高プライレーティング化が必要となる
も、航空機機体メーカからタイヤメーカに対する今後の
要求は、機体重量の増加を抑制するとともに、タイヤの
格納スペースをできるだけ小さくする目的の下に、タイ
ヤを大型化するよりもむしろ高プライレーティング化す
ること、またはリムフランジの高さを低くしてタイヤの
荷重負担容積を増やすことによって、タイヤの許容負荷
能力を高める方向に向くものと考えられている。2. Description of the Related Art With the recent tendency of aircraft bodies to become larger,
In order to cope with the increase in the weight of the aircraft, it is necessary to increase the size of the tires for the aircraft or to increase the ply rating. To reduce the storage space of the tires as much as possible, increase the ply rating rather than enlarge the tires, or reduce the height of the rim flange to increase the load bearing capacity of the tires. It is considered to be in the direction of increasing load capacity.
【０００３】しかるに、高プライレーティング化およ
び、リムフランジ高さの低下はいずれも、タイヤにとっ
てはよりシビアな要求であり、とくに、重荷重を支持す
るタイヤビード部の負担が極めて厳しくなる。[0003] However, increasing the ply rating and reducing the height of the rim flange are both more demanding requirements for the tire, and in particular, the burden on the tire bead portion that supports heavy loads becomes extremely severe.
【０００４】[0004]
【発明が解決しようとする課題】ところで、従来は一般
に、ケーブルビードの構造、すなわち、それのコア径、
レイヤ径およびレイヤ本数は、主には、それの破壊耐圧
性を基準として決定し、また、ケーブルビードの内径
は、行政指導の下での要求条件または、初期装着タイヤ
の現実の動的要求性能を満足するに必要な、タイヤのリ
ム組み時の、ビードシートとケーブルビードとの間のゴ
ムの圧縮率に基づいて決定することとしているも、ケー
ブルビードと、リムフランジの高さ等との関係は考慮に
入れていなかったため、上述したリムフランジ高さの低
下への対応は甚だ困難である。Conventionally, generally, the structure of a cable bead, that is, its core diameter,
The layer diameter and the number of layers are mainly determined based on the breakdown pressure resistance of the layer, and the inner diameter of the cable bead is determined by the requirements under administrative guidance or the actual dynamic required performance of the initially mounted tire. Is determined based on the compression ratio of the rubber between the bead seat and the cable bead when assembling the tire, which is necessary to satisfy the relationship between the cable bead and the height of the rim flange, etc. Therefore, it is extremely difficult to cope with the reduction in the height of the rim flange described above.
【０００５】そこでこの発明は、荷重を支える芯の役割
を果たすケーブルビードと、リムフランジ位置等の関係
を、種々の実験に基づいて、プライレーティングとの関
連の下に特定することで、リムフランジの高さを低くし
てなお、すぐれたビード部耐久性を発揮することができ
る重荷重用空気入りラジアルタイヤを提供する。Accordingly, the present invention specifies a relationship between a cable bead serving as a core for supporting a load and a rim flange position, etc., based on various experiments, in relation to a ply rating. The present invention provides a pneumatic radial tire for heavy loads capable of exhibiting excellent bead portion durability while reducing the height of the pneumatic radial tire.
【０００６】これをいいかえれば、この発明に係る特定
に従えば、現実の規格タイヤを基準とした場合に、リム
フランジの高さをどの程度まで低くできるか、また、現
在のシングルビード構造をもって、所要のリムフランジ
高さに対応できるか否かを見極めることもできる。In other words, according to the specification according to the present invention, how much the height of the rim flange can be reduced with reference to the actual standard tire, and also with the current single bead structure, It can also be determined whether the required rim flange height can be accommodated.
【０００７】[0007]
【課題を解決するための手段】この発明の重荷重用空気
入りラジアルタイヤは、ビードシートと、このビードシ
ートの幅方向外側に連続して半径方向外方へ突出し、幅
方向外側への湾曲部を有するリムフランジとを具える規
格リムに適用可能な、タイヤビード部にたとえば一本の
ケーブルビードを埋設した、プライレーティングが３２
以上のものであって、プライレーティングＸおよびケー
ブルビード外径Ｄｏの、リムフランジの外側湾曲始端直
径Ｄｒおよびリムフランジ高さＦｈとの相対関係を、 （Ｄｏ−Ｄｒ）／Ｆｈ≦８．５５Ｘ−０．７９ としたものである。A heavy-duty pneumatic radial tire according to the present invention has a bead sheet and a radially outwardly projecting portion which continuously projects outwardly in the width direction of the bead sheet and has a curved portion outwardly in the width direction. The tire bead portion has, for example, one cable bead buried therein, and is applicable to a standard rim having a rim flange having a ply rating of 32.
Be those described above, the ply rating X and cable bead outer diameter D o, the relationship between the outer curvature of the rim flange starting diameter D r and the rim flange height F h, (D o -D r ) / F h ≦ 8.55X− 0.79 .
【０００８】なおここで、規格リムとは、ＴＨＥ ＴＩ
ＲＥ ａｎｄ ＲＩＭ ＡＳＳＯＣＩＡＴＩＯＮ ＩＮ
Ｃ．発行の、「２０００ Ａ ＡＩＲＣＲＡＦＴ ＹＥ
ＡＲＢＯＯＫ」に規定されている（以下「ＴＲＡに規定
の」という）リムをいうものとし、リムフランジ高さＦ
ｈもまた、ＴＲＡに規定の高さをいうものとする。ま
た、リムフランジの外側湾曲始端とは、リムフランジの
垂直部の、半径方向の外縁位置をいうものとする。[0008] Here, the standard rim is a THE TI
RE and RIM ASSOCIATION IN
C. Issued "2000 A AIRCRAFT YE
ARBOOK ”(hereinafter referred to as“ TRA ”), and the rim flange height F
h also refers to the height specified in the TRA. Also, the outer curved start end of the rim flange refers to the radial outer edge position of the vertical portion of the rim flange.
【０００９】ＴＲＡに規定のホイールリムでは、リムフ
ランジは、垂直部と、この垂直部の外周側に、リムフラ
ンジ高さＦｈの１／２の半径で幅方向外側に円弧状に湾
曲する湾曲部を具えるものとされており、このようなホ
イールリムに、タイヤをリム組みするとともに、内圧の
充填下で重荷重を負荷した場合には、タイヤ、とくにそ
のビード部は、リムフランジの内面に沿って大きく撓み
変形し、これがため、ビード部に配設したケーブルビー
ドの近傍に、ケーブルビードの中心をセンタとする回転
トルクが発生し、また、ケーブルビードと、それの外周
側に配設したビードエペックスとの境界に剪断力が生
じ、これらの力が過大になった時に故障が発生する。[0009] In the provision of the wheel rim to TRA, the rim flange, and a vertical section, curved on the outer peripheral side of the vertical portion, an arc-shaped outward in the width direction by 1/2 of the radius of the rim flange height F h curved When a tire is mounted on such a wheel rim and a heavy load is applied under the filling of internal pressure, the tire, especially its bead, is attached to the inner surface of the rim flange. A large torque is generated in the vicinity of the cable bead arranged in the bead portion, so that a rotational torque centering on the center of the cable bead is generated, and the cable bead and the outer peripheral side thereof are arranged. Shear forces occur at the boundary with the bead epex, and a failure occurs when these forces become excessive.
【００１０】発明者の各種実験によれば、これらの限界
は、リムフランジの外側湾曲始端直径Ｄｒと、ケーブル
ビード外径Ｄｏとの間の半径方向距離（Ｄｏ−Ｄｒ）／
２の、リムフランジ高さＦｈの中心を通る水平線からフ
ランジ上縁までの距離Ｆｈ／２に対する比によって定義
可能であることが明らかになり、その値は、プライレー
ティングが大きくなるにつれて小さくなることが明らか
になった。According to the inventor's various experiments, these limits, the outer curved starting diameter D r of the rim flange, the radial distance between the cable bead outer diameter D o (D o -D r) /
2, it becomes clear can be defined by the ratio of the distance F h / 2 from the horizontal line passing through the center of the rim flange height F h until the flange on the edge, the value becomes smaller as ply rating increases It became clear.
【００１１】そこでこの発明では、これらの知見に基づ
いて、その比を、 （Ｄｏ−Ｄｒ）／Ｆｈ≦８．５５Ｘ−０．７９ とし、この条件が満たされる場合には、すぐれたビード
部耐久性が実現できるとする。この一方で、上記式によ
れば、プライレーティングが高くなればなるほど、フラ
ンジ湾曲始端直径Ｄｒに対して、ケーブルビード外径Ｄ
ｏを小さくしないと、十分なビード部耐久性を確保し得
ないことが解る。Therefore, in the present invention, based on these findings, the ratio is set to (D o −D r ) / F h ≦ 8.55X− 0.79 , and when this condition is satisfied, the ratio is excellent. It is assumed that bead durability can be realized. In the other hand, according to the above equation, the higher the ply rating, with respect to the flange bend starting diameter D r, cable bead outer diameter D
It can be seen that if o is not reduced, sufficient bead portion durability cannot be ensured.
【００１２】[0012]
【発明の実施の形態】以下にこの発明の実施の形態を図
面に示すところに基づいて説明する。図１は、この発明
の実施の形態を、タイヤを規格リムに組付けて、一旦Ｔ
ＲＡに規定の内圧を充填した後、その内圧を１０ｋＰａ
未満まで低減させた姿勢で示す要部横断面図であり、図
中１はタイヤビード部を、２は、そのタイヤビード部１
を組付けたリムをそれぞれ示す。なおここにおける空気
入りラジアルタイヤは、３２以上のプライレーティング
を有するものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention in which a tire is mounted on a standard rim and once T
After filling the RA with the prescribed internal pressure, the internal pressure is increased to 10 kPa
FIG. 2 is a cross-sectional view of a main part in a posture reduced to less than 1 in FIG.
Are shown respectively. The pneumatic radial tire here has a ply rating of 32 or more.
【００１３】ここに示すビード部１では、そこに埋設し
た一本のケーブルビード３の周りで、ラジアルカーカス
４を、タイヤ幅方向の内側から外側に巻き上げるととも
に、ケーブルビード３の外周側で、ラジアルカーカス４
の本体部分と巻き上げ部分との間に、半径方向外方に向
けて次第に薄肉となるビードエペックス５を配設する。In the bead portion 1 shown here, a radial carcass 4 is wound up from one inside to the outside in the tire width direction around one cable bead 3 embedded therein, and a radial carcass 4 is wound around the outer periphery of the cable bead 3. Carcass 4
A bead epex 5 that gradually becomes thinner in the radial direction is disposed between the main body portion and the winding portion.
【００１４】また、リム２は、ビード部１のビードベー
スを着座させるビードシート６と、隅丸凹部７を介して
そのビードシート６の幅方向外側に連続し、半径方向外
方へ突出するリムフランジ８とを具えるものであり、そ
のリムフランジ８は、垂直部８ａと、この垂直部８ａの
外周側で、幅方向外側に円弧状に湾曲する湾曲部８ｂと
を有する。The rim 2 is connected to a bead seat 6 on which the bead base of the bead portion 1 is seated, and a rim that is continuous with the bead seat 6 in the width direction outside via the rounded concave portion 7 and protrudes outward in the radial direction. The rim flange 8 includes a vertical portion 8a, and a curved portion 8b that is curved outward in the width direction on the outer peripheral side of the vertical portion 8a.
【００１５】ここでは、前述したように、リムフランジ
高さＦｈを、ＴＲＡに規定されているように、リムのサ
イズ表示のリム径からリムフランジ外周縁までの半径方
向距離とし、また、リムフランジ８の湾曲部８ｂの曲率
半径を、垂直部８ａの半径方向外縁位置、いいかえれ
ば、リムフランジの外側湾曲始端を通る水平線分上に中
心をおくＦｈ／２とする。[0015] Here, as described above, the rim flange height F h, as specified in TRA, and the radial distance from the rim diameter size display of the rim until the rim flange outer edge, also, rim the curvature radius of the curved portion 8b of the flange 8, the radial outer edge position of the vertical portion 8a, in other words, the F h / 2 centered on a horizontal line passing through the outer curved starting end of the rim flange.
【００１６】またここでは、リムフランジの外側湾曲始
端の直径をＤｒとし、これらと、プライレーティングＸ
およびケーブルビード外径Ｄｏとの相対関係を、 （Ｄｏ−Ｄｒ）／Ｆｈ≦８．５５Ｘ−０．７９ とする。[0016] Here, the diameter of the outer curved starting end of the rim flange and D r, and these, ply rating X
And the relative relationship between the cable bead outer diameter D o, and (D o -D r) / F h ≦ 8.55X -0.79.
【００１７】この条件を満たす場合には、実験上リムフ
ランジ高さＦｈに対してすぐれたビード部耐久性を確保
することができるので、既存のタイヤに対してはリムフ
ランジ高さＦｈの限界を容易に見極めることができ、逆
に、所要のリムフランジ高さＦｈに対しては、要求を満
たすプライレーティングＸおよびケーブルビード外径Ｄ
ｏの選択を容易ならしめることができる。[0017] When this condition is satisfied, it is possible to secure a good bead portion durability to the experiment on the rim flange height F h, the rim flange height F h for existing tire can determine the limit easily, conversely, for the required rim flange height F h, ply rating X and cable bead outer diameter D satisfy the request
o can be easily selected.
【００１８】[0018]
【実施例】プライレーティングが３２以上の要件を満た
す既存の航空機用タイヤとして表１に示す三種類を選択
し、上記式 （Ｄｏ−Ｄｒ）／Ｆｈ≦８．５５Ｘ−０．７９ の左項を同表に示すように変化させた。なお表１中のフ
ランジ高さＦｈ（ｉｎ）は、上段に示すものが、ＴＲＡ
に規定の標準リムのフランジ高さである。EXAMPLE Three types of existing tires shown in Table 1 were selected as existing aircraft tires satisfying the requirement of a ply rating of 32 or more, and the above formula (D o -D r ) / F h ≤8.55X- 0.79 The left term was changed as shown in the table. Note that the flange height F h (in) in Table 1 is indicated by TRA
Is the standard rim flange height specified.
【００１９】[0019]
【表１】 [Table 1]
【００２０】これらの各タイヤをそれぞれのリムに組付
けるとともに、ＴＲＡに規定の内圧を充填して、第１に
は、規定荷重の１８７％を負荷し、停止状態から各タイ
ヤの規定速度まで一定加速度で加速して、トータル走行
距離が１１５００ｆｔ（３５０７．５ｍ）になるように
試験を行い、第２には、規定荷重の８０％を負荷して、
４０ｍｐｈ（６４．３６ｋｍ／ｈ）の一定速度で８分間
走行させるのを一サイクルとし、各サイクルの開始時間
間隔を１２０分として同様のことを繰り返す試験を行っ
たところ、表２に示す通りとなった。[0020] Each of these tires is mounted on each rim, and the TRA is filled with a specified internal pressure. First, 187% of a specified load is applied, and a constant speed is maintained from a stopped state to a specified speed of each tire. The test was performed by accelerating at an acceleration so that the total mileage became 11500 ft (3507.5 m).
A test in which running at a constant speed of 40 mph (64.36 km / h) for 8 minutes was defined as one cycle, and a similar test was repeated with the start time interval of each cycle being 120 minutes, as shown in Table 2. Was.
【００２１】[0021]
【表２】 [Table 2]
【００２２】表２に示されるところによれば、先の条件
式を満足するタイヤはいずれも、適用リムとの関連の下
で、第１および第２のそれぞれの試験において高いビー
ド部耐久性を発揮することが明らかである。According to Table 2, all tires satisfying the above condition have high bead durability in the first and second tests in relation to the applicable rim. It is clear that it works.
【００２３】[0023]
【発明の効果】かくして、この発明によれば、特定の条
件を満足させることで、リムフランジ高さの低下の要求
に十分に対応できる重荷重用空気入りラジアルタイヤを
提供することができる。As described above, according to the present invention, it is possible to provide a pneumatic radial tire for heavy loads capable of sufficiently satisfying a requirement for a reduction in rim flange height by satisfying specific conditions.
【図１】 この発明の実施の形態を、リム組み姿勢で示
す要部横断面図である。FIG. 1 is a main part cross-sectional view showing an embodiment of the present invention in a rim assembly posture.
１ タイヤビード部 ２ リム ３ ケーブルビード ４ ラジアルカーカス ５ ビードエペックス ６ ビードシート ７ 隅丸凹部 ８ リムフランジ ８ａ 垂直部 ８ｂ 湾曲部 Ｆｒ リムフランジ高さ Ｄｏ ケーブルビード外径 Ｄｒ リムフランジの外側湾曲始端直径 ｌ，ｍ 直線 ｐ 交点DESCRIPTION OF SYMBOLS 1 Tire bead part 2 Rim 3 Cable bead 4 Radial carcass 5 Bead epex 6 Bead sheet 7 Corner round recess 8 Rim flange 8a Vertical part 8b Curved part Fr Rim flange height D o Cable bead outside diameter D r Outside of rim flange Curve start end diameter l, m straight line p intersection
Claims (1)
方向外側に連続して半径方向外方へ突出するリムフラン
ジとを具える規格リムに適用できる、タイヤビード部に
ケーブルビードを埋設し、プライレーティングが３２以
上である重荷重用空気入りラジアルタイヤにおいて、 プライレーティングＸおよびケーブルビード外径Ｄ
ｏの、リムフランジの外側湾曲始端直径Ｄｒおよびリム
フランジ高さＦｈとの相対関係を、 （Ｄｏ−Ｄｒ）／Ｆｈ≦８．５５Ｘ−０．７９ としてなる重荷重用空気入りラジアルタイヤ。1. A cable bead is buried in a tire bead portion, which is applicable to a standard rim having a bead sheet and a rim flange continuously projecting outward in the width direction outside of the bead sheet in the width direction. For a heavy-duty pneumatic radial tire having a rating of 32 or more, a ply rating X and a cable bead outer diameter D
of o, the relative relationship between the outer curvature of the rim flange starting diameter D r and the rim flange height F h, (D o -D r ) / F h composed as ≦ 8.55X -0.79 heavy duty pneumatic radial tire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001046330A JP4729182B2 (en) | 2001-02-22 | 2001-02-22 | Heavy duty pneumatic radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001046330A JP4729182B2 (en) | 2001-02-22 | 2001-02-22 | Heavy duty pneumatic radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002248912A true JP2002248912A (en) | 2002-09-03 |
| JP4729182B2 JP4729182B2 (en) | 2011-07-20 |
Family
ID=18907978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001046330A Expired - Lifetime JP4729182B2 (en) | 2001-02-22 | 2001-02-22 | Heavy duty pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4729182B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008143346A (en) * | 2006-12-08 | 2008-06-26 | Bridgestone Corp | Pneumatic radial tire for aircraft |
| JP2010036695A (en) * | 2008-08-04 | 2010-02-18 | Bridgestone Corp | Radial tire for aircraft |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9216614B2 (en) | 2011-02-04 | 2015-12-22 | Bridgestone Corporation | Rim for a pneumatic tire |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01175510A (en) * | 1987-12-29 | 1989-07-12 | Sumitomo Rubber Ind Ltd | Radial tire for heavy load |
| JPH0253616A (en) * | 1988-08-16 | 1990-02-22 | Sumitomo Rubber Ind Ltd | Heavy load and high speed radial tire |
| JPH04189609A (en) * | 1990-11-21 | 1992-07-08 | Sumitomo Rubber Ind Ltd | Tire for high speed and heavy load |
| JP2000127718A (en) * | 1998-10-27 | 2000-05-09 | Bridgestone Corp | Heavy duty pneumatic radial tire |
| JP2001030722A (en) * | 1999-07-19 | 2001-02-06 | Bridgestone Corp | Pneumatic radial tire for high-speed and heavy load |
-
2001
- 2001-02-22 JP JP2001046330A patent/JP4729182B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01175510A (en) * | 1987-12-29 | 1989-07-12 | Sumitomo Rubber Ind Ltd | Radial tire for heavy load |
| JPH0253616A (en) * | 1988-08-16 | 1990-02-22 | Sumitomo Rubber Ind Ltd | Heavy load and high speed radial tire |
| JPH04189609A (en) * | 1990-11-21 | 1992-07-08 | Sumitomo Rubber Ind Ltd | Tire for high speed and heavy load |
| JP2000127718A (en) * | 1998-10-27 | 2000-05-09 | Bridgestone Corp | Heavy duty pneumatic radial tire |
| JP2001030722A (en) * | 1999-07-19 | 2001-02-06 | Bridgestone Corp | Pneumatic radial tire for high-speed and heavy load |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008143346A (en) * | 2006-12-08 | 2008-06-26 | Bridgestone Corp | Pneumatic radial tire for aircraft |
| JP2010036695A (en) * | 2008-08-04 | 2010-02-18 | Bridgestone Corp | Radial tire for aircraft |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4729182B2 (en) | 2011-07-20 |
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