JPH0966706A - Pneumatic bias tire for heavy-duty vehicle - Google Patents
Pneumatic bias tire for heavy-duty vehicleInfo
- Publication number
- JPH0966706A JPH0966706A JP7222887A JP22288795A JPH0966706A JP H0966706 A JPH0966706 A JP H0966706A JP 7222887 A JP7222887 A JP 7222887A JP 22288795 A JP22288795 A JP 22288795A JP H0966706 A JPH0966706 A JP H0966706A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- plies
- ply
- folded
- layers
- 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】本発明は建設車両用空気入り
バイアス・タイヤ等に代表される重車両用空気入りバイ
アス・タイヤに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic bias tire for heavy vehicles represented by a pneumatic bias tire for construction vehicles.
【０００２】[0002]
【従来の技術】一般的に、複数層のプライよりなるカー
カス・プライを備えた空気入りバイアス・タイヤの製造
方法では、タイヤの生産性を向上するために、プライを
１枚ずつ成型ドラムの上で張り付けて行くのではなく、
予め別工程で２層以上のプライを積層してバンドを形成
しておき、そのバンドを成型ドラムの上で張り付けて行
く方法が採用されている。一方、複数層のプライよりな
るカーカス・プライと備えた空気入りバイアス・タイヤ
では、カーカス・プライを構成する複数層のプライの折
り返し端部が同じ位置にくると剛性の段差が生じて、セ
パレーション故障が発生しやすいので、複数層のプライ
のプライ幅を異ならせてプライの折り返し端部位置をず
らすことが好ましい。しかし、異なる幅のプライを多数
準備することはタイヤの生産性阻害要因となるので、同
一幅のプライを多数準備し、上記のバンド成型工程で同
一幅の２層以上のプライを幅方向にずらせて積層する、
いわゆるオフセット張りをおこなっている。このように
して、剛性の段差を持たずしかも生産性の優れたタイヤ
が得られるが、オフセット張りをおこなった結果、プラ
イの折り返し端部がタイヤの左右で非対象となり、左右
いずれかの一方ではプライの折り返し端部が最も広い幅
のプライで覆われているが、他方の側ではすべてのプラ
イの折り返し端部がカーカスの外側に位置しそれらを覆
うプライは存在しないことになり、プライの折り返し端
でのセパレーション故障が発生しやすくなる。このよう
な不具合を解消するために、従来の典型的なバイアス・
タイヤのカーカス・プライは、一方のビード部から他方
のビード部に延び、ビード・コアーを内側から外側に向
かって折り返されてビード部に係留されたアップ・プラ
イと、アップ・プライを外側から覆うように、ビード・
コアーを外側から内側に向かって折り返されたダウン・
プライとで構成されていた。2. Description of the Related Art Generally, in a pneumatic bias tire manufacturing method having a carcass ply composed of a plurality of layers of plies, in order to improve the productivity of the tire, one ply is placed on a molding drum. Instead of sticking with
A method is adopted in which two or more layers of plies are laminated in advance in another step to form a band, and the band is attached on a molding drum. On the other hand, in a pneumatic bias tire equipped with a carcass ply composed of multiple layers of plies, when the folded-back ends of the plies of the multiple layers forming the carcass ply come to the same position, a step difference in rigidity occurs, causing a separation failure. Therefore, it is preferable that the ply widths of the plies of a plurality of layers are made different to shift the folding end positions of the plies. However, preparing a large number of plies of different widths will hinder the productivity of the tire. Therefore, prepare a large number of plies of the same width and shift two or more plies of the same width in the width direction in the above band molding process. To stack,
So-called offset tension is performed. In this way, a tire having no rigidity difference and excellent productivity can be obtained, but as a result of offset tensioning, the folded ply ends of the ply are not symmetrical on the left and right sides of the tire, and on either the left or right side. The folded ends of the plies are covered by the widest ply, but on the other side all folded plies are located outside the carcass and there is no ply covering them, so there is no ply turn. Separation failure at the edge is likely to occur. In order to eliminate such problems, the conventional bias
The carcass ply of the tire extends from one bead part to the other bead part, and the bead core is folded back from the inside toward the outside to cover the up ply moored at the bead part and the up ply from the outside. Like the bead
Down that folded the core from the outside to the inside
It consisted of ply and.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
典型的なバイアス・タイヤが必ず備えているダウン・プ
ライがプライの折り返し端でのセパレーション故障発生
を防止または抑制し、タイヤの耐久性向上に効果的であ
るとは言え、タイヤの生産性阻害要因となっていること
は明白である。However, the down ply, which is always included in the conventional typical bias tire, prevents or suppresses the occurrence of the separation failure at the folded end of the ply, and is effective in improving the durability of the tire. However, it is clear that it is a factor that impedes tire productivity.
【０００４】本発明の目的は、複数層のプライよりなる
カーカス・プライを備えた空気入りバイアス・タイヤの
生産性を阻害することなく、プライの折り返し端でのセ
パレーション故障発生を防止または抑制し、タイヤの耐
久性を向上した空気入りバイアス・タイヤを提供するこ
とである。An object of the present invention is to prevent or suppress the occurrence of a separation failure at the folded end of a ply without impairing the productivity of a pneumatic bias tire having a carcass ply composed of a plurality of plies, A pneumatic bias tire having improved tire durability is provided.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明による空気入りタイヤは、左右一対のビー
ド部に設けられたビード・コアーと、カーカス・プライ
とを備えた空気入りバイアス・タイヤにおいて（１）該
カーカス・プライは、一方のビード部から他方のビード
部に延び、該ビード・コアーを内側から外側に向かって
折り返されてビード部に係留された４層以上のプライよ
りなり、（２）該カーカス・プライは、有機繊維コード
をタイヤ赤道線に対し２０乃至４５度の角度に並列して
ゴムに埋設されたプライを、隣接する層間でコード方向
がタイヤ赤道線を挟んで逆向きに配置され、コードが互
いに交差するように積層されてなり、（３）該カーカス
・プライは、折り返し端部が、相互に１０乃至４０ｍｍ
の間隔を置いて、タイヤ高さの４２乃至６０％の範囲に
位置する複数層の高折り返しプライと、折り返し端部
が、相互に１０乃至４０ｍｍの間隔を置いて、タイヤ高
さの１０乃至３０％の範囲に位置する複数層の低折り返
しプライとよりなることを特徴とする重車両用空気入り
バイアス・タイヤである。In order to achieve the above object, a pneumatic tire according to the present invention comprises a pneumatic bias provided with a bead core provided at a pair of left and right bead portions and a carcass ply. In the tire, (1) the carcass ply extends from one bead portion to the other bead portion, and the bead core is folded back from the inner side to the outer side, and is composed of four or more layers of plies anchored to the bead portion. (2) In the carcass ply, the ply in which the organic fiber cords are embedded in rubber by arranging the organic fiber cords in parallel with each other at an angle of 20 to 45 degrees with respect to the tire equator line, and the cord direction sandwiches the tire equator line between adjacent layers. (3) The carcass ply has folded-back ends of 10 to 40 mm from each other.
10 to 30 of the height of the tire, and the high-folded ply of a plurality of layers positioned in the range of 42 to 60% of the height of the tire and the end of the folded back are spaced from each other by 10 to 40 mm. A pneumatic bias tire for a heavy vehicle, comprising a plurality of low-turn-back plies positioned in the range of%.
【０００６】プライの折り返し端でのセパレーション故
障発生状況とプライの折り返し端の位置との関係につい
て研究した結果、セパレーション故障が発生し易い領域
と発生し難い領域とが存在することが判明した。従来の
タイヤは、剛性の段差を避けるためにプライの折り返し
端を相互に等間隔またはほぼ等間隔に配置していたの
で、複数層のプライのうち、その折り返し端の位置がセ
パレーション故障が発生し難い領域に位置するものもあ
ったが、セパレーション故障が発生し易い領域に位置す
るものもあった。しかし、本発明のタイヤでは、上記の
ようにカーカス・プライを高折り返しプライと低折り返
しプライとで構成し、折り返し端の位置がセパレーショ
ン故障が発生し易い領域をさけて配置してあるので、タ
イヤの耐久性が向上し、生産性向上の阻害要因となるダ
ウン・プライが不要となる。As a result of research on the relationship between the separation failure occurrence state at the ply turn-up end and the position of the ply turn-up end, it has been found that there are regions where separation faults are likely to occur and regions where they are unlikely to occur. In conventional tires, the folded-back ends of the plies are arranged at equal or almost equal intervals to each other in order to avoid a step in rigidity, so that a separation failure occurs at the folded-back ends of the plies of multiple layers. Some were located in difficult areas, while others were located in areas where separation failures were likely to occur. However, in the tire of the present invention, as described above, the carcass ply is composed of the high-folded ply and the low-folded ply, and the position of the folded-back end is arranged so as to avoid the region where separation failure is likely to occur. Durability is improved, and the down ply, which is a factor that hinders productivity improvement, is no longer required.
【０００７】[0007]
【発明の実施の形態】以下、図１に示す本発明に従う実
施例のタイヤにより本発明を詳細に説明する。実施例の
タイヤは、タイヤ・サイズがＯＲＳ１８．４−２４の建
設車両用空気入りバイアス・タイヤであって、左右一対
のビード部に設けられたビード・コアー１と、カーカス
・プライ２とを備えている。カーカス・プライ２は４層
のプライよりなり、４層のプライすべてが、一方のビー
ド部から他方のビード部に延び、ビード・コアー１を内
側から外側に向かって折り返されてビード部に係留され
たアップ・プライであり、１８９０ｄ／２のナイロン・
コードをタイヤ赤道線に対し４０度の角度に並列してゴ
ムに埋設されたプライを、隣接する層間でコード方向が
タイヤ赤道線を挟んで逆向きに配置され、コードが互い
に交差するように積層されてなる。４層のカーカス・プ
ライは、折り返し高さがｈ1 ＝２００ｍｍおよびｈ2 ＝
１７５ｍｍの２層の高折り返しプライを形成する第１プ
ライおよび第２プライと、折り返し高さがｈ3 ＝９０ｍ
ｍおよびｈ4 ＝６５ｍｍの２層の低折り返しプライを形
成する第３プライおよび第４プライよりなる。タイヤ高
さＨは３８３ｍｍであるから、高折り返しプライはその
折り返し端部がタイヤ高さの４５乃至５２％の範囲に位
置し、低折り返しプライはその折り返し端部がタイヤ高
さの１７乃至２４％の範囲に位置する。高折り返しプラ
イおよび低折り返しプライの折り返し端部の相互間隔
は、それぞれ、２５ｍｍであるが、高折り返しプライと
低折り返しプライの折り返し端部の間隔は大きくなって
いて、８５ｍｍである。この８５ｍｍの領域がセパレー
ション故障が発生し易い領域であって、そこを避けてカ
ーカス・プライ２の折り返し端部が配置されている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to a tire of an embodiment according to the present invention shown in FIG. The tire according to the embodiment is a pneumatic bias tire for a construction vehicle having a tire size of ORS18.4-24, and includes a bead core 1 provided at a pair of left and right bead portions and a carcass ply 2. ing. The carcass ply 2 is composed of four layers of plies, and all four layers of plies extend from one bead portion to the other bead portion, and the bead core 1 is folded back from the inside to the outside and is anchored to the bead portion. Up ply, 1890d / 2 nylon
The plies embedded in rubber with the cords arranged in parallel at an angle of 40 degrees with respect to the tire equator line are arranged so that the cord directions are opposite to each other with the tire equator line sandwiched between adjacent layers and the cords cross each other. It will be done. The four-layer carcass ply has a folding height of h1 = 200 mm and h2 =
1st ply and 2nd ply forming a two-layer high folded ply of 175 mm, and the folded height is h3 = 90 m
It consists of a third ply and a fourth ply forming two layers of low folding plies with m and h4 = 65 mm. Since the tire height H is 383 mm, the high folded ply has its folded end located in the range of 45 to 52% of the tire height, and the low folded ply has its folded end of 17 to 24% of the tire height. Located in the range of. The mutual distance between the folded-back ends of the high-folded ply and the low-folded ply is 25 mm, but the distance between the folded-back ends of the high-folded ply and the low-folded ply is large, and is 85 mm. This 85 mm region is a region where separation failure is likely to occur, and the folded end portion of the carcass ply 2 is arranged avoiding it.
【０００８】比較例のタイヤは、４層のカーカス・プラ
イの折り返し高さが１５０ｍｍ、１２０ｍｍ、９０ｍｍ
および６０ｍｍで、４層が３０ｍｍの間隔を置いて配置
されていること以外は、実施例のタイヤとほぼ同じであ
る。In the tire of the comparative example, the folding heights of the four-layer carcass ply are 150 mm, 120 mm and 90 mm.
And 60 mm and is substantially the same as the example tire, except that the four layers are spaced 30 mm apart.
【０００９】上記実施例のタイヤと比較例のタイヤにつ
いて、室内ドラム試験機でタイヤ耐久性能の比較試験を
行った。試験条件は、正規内圧２．２ｋｇ／ｃｍ2 を充
填し、正規荷重３９４０ｋｇの１３５％に相当する５３
２０ｋｇを負荷し、２４０時間走行させるという条件で
あり、評価項目はカーカス・プライの折り返し端部の亀
裂発生長さの比較である。試験結果を表１に示す。The tires of the above-mentioned examples and the tires of comparative examples were subjected to a comparative test of tire durability performance with an indoor drum tester. The test condition is that a normal internal pressure of 2.2 kg / cm 2 is filled, which corresponds to 135% of the normal load of 3940 kg.
The condition is to load 20 kg and run for 240 hours, and the evaluation item is a comparison of the crack generation length at the folded end of the carcass ply. Table 1 shows the test results.
【００１０】[0010]
【表１】 [Table 1]
【００１１】表１の結果から、実施例のタイヤは比較例
のタイヤに比べ、タイヤ耐久性能が優れたタイヤである
ことがわかる。From the results shown in Table 1, it is understood that the tires of Examples are tires having excellent tire durability performance as compared with the tires of Comparative Examples.
【００１２】[0012]
【発明の効果】本発明によって、複数層のプライよりな
るカーカス・プライを備えた空気入りバイアス・タイヤ
の生産性を阻害することなく、プライの折り返し端での
セパレーション故障発生を防止または抑制し、タイヤの
耐久性向上した空気入りバイアス・タイヤを提供するこ
とが可能となった。According to the present invention, it is possible to prevent or suppress the occurrence of a separation failure at the folded end of a ply without impairing the productivity of a pneumatic bias tire having a carcass ply composed of a plurality of plies. It has become possible to provide a pneumatic bias tire with improved tire durability.
【図１】本発明によるタイヤのカーカス構造を示すタイ
ヤ子午線断面略図である。FIG. 1 is a schematic tire meridian sectional view showing a carcass structure of a tire according to the present invention.
１ ビード・コアー ２ カーカス・プライ 1 bead core 2 carcass ply
Claims (1)
・コアーと、カーカス・プライとを備えた空気入りバイ
アス・タイヤにおいて（１）該カーカス・プライは、一
方のビード部から他方のビード部に延び、該ビード・コ
アーを内側から外側に向かって折り返されてビード部に
係留された４層以上のプライよりなり、（２）該カーカ
ス・プライは、有機繊維コードをタイヤ赤道線に対し２
０乃至４５度の角度に並列してゴムに埋設されたプライ
を、隣接する層間でコード方向がタイヤ赤道線を挟んで
逆向きに配置され、コードが互いに交差するように積層
されてなり、（３）該カーカス・プライは、折り返し端
部が、相互に１０乃至４０ｍｍの間隔を置いて、タイヤ
高さの４２乃至６０％の範囲に位置する複数層の高折り
返しプライと、折り返し端部が、相互に１０乃至４０ｍ
ｍの間隔を置いて、タイヤ高さの１０乃至３０％の範囲
に位置する複数層の低折り返しプライとよりなることを
特徴とする重車両用空気入りバイアス・タイヤ。1. A pneumatic bias tire including a bead core provided on a pair of left and right bead portions and a carcass ply, wherein (1) the carcass ply has one bead portion to the other bead portion. (2) The carcass ply is composed of four or more layers of plies anchored to the bead portion by folding back the bead core from the inside to the outside.
The plies embedded in rubber in parallel at an angle of 0 to 45 degrees are arranged so that the cord directions are opposite to each other with the tire equator line sandwiched between adjacent layers, and the cords are laminated so as to intersect each other. 3) The carcass ply has a plurality of layers of high-turnback plies, the turn-up ends of which are located in a range of 42 to 60% of the tire height, with the turn-up ends being spaced from each other by 10 to 40 mm. 10 to 40m from each other
A pneumatic bias tire for heavy vehicles, comprising a plurality of layers of low turn-back plies which are located in a range of 10 to 30% of a tire height at intervals of m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22288795A JP3545511B2 (en) | 1995-08-31 | 1995-08-31 | Pneumatic bias tires for heavy vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22288795A JP3545511B2 (en) | 1995-08-31 | 1995-08-31 | Pneumatic bias tires for heavy vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0966706A true JPH0966706A (en) | 1997-03-11 |
| JP3545511B2 JP3545511B2 (en) | 2004-07-21 |
Family
ID=16789437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22288795A Expired - Fee Related JP3545511B2 (en) | 1995-08-31 | 1995-08-31 | Pneumatic bias tires for heavy vehicles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3545511B2 (en) |
-
1995
- 1995-08-31 JP JP22288795A patent/JP3545511B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3545511B2 (en) | 2004-07-21 |
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