JP3157602B2 - Runflat pneumatic radial tires - Google Patents
Runflat pneumatic radial tiresInfo
- Publication number
- JP3157602B2 JP3157602B2 JP11616792A JP11616792A JP3157602B2 JP 3157602 B2 JP3157602 B2 JP 3157602B2 JP 11616792 A JP11616792 A JP 11616792A JP 11616792 A JP11616792 A JP 11616792A JP 3157602 B2 JP3157602 B2 JP 3157602B2
- Authority
- JP
- Japan
- Prior art keywords
- tire
- hard rubber
- rubber layer
- carcass
- layer
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
- B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】ランフラットすなわち空気入りタ
イヤの空気圧がパンクの如きによって抜けはじめ、また
抜け去ってその空気圧による輪重の支持能力が減少・喪
失した場合にも応急的な、すなわち最寄りのサービス施
設に向う走行の間における輪重の肩代り支持を司る構造
物をサイド補強として予め組込んである、いわゆるラン
フラット空気入りラジアルタイヤに関してこの発明は、
ランフラット性能の著大な改善を実現して、サービス施
設に至る走破距離が長いときも安全な運行の継続を確保
することを可能ならしめようとするものである。BACKGROUND OF THE INVENTION Run-flat, i.e., the air pressure of a pneumatic tire begins to escape due to a puncture, and when the air pressure decreases and loses the ability to support the wheel load due to the air pressure, the emergency, that is, the nearest The present invention relates to a so-called run-flat pneumatic radial tire in which a structure responsible for shoulder load support during running toward a service facility is incorporated in advance as a side reinforcement.
The aim is to achieve a significant improvement in run flat performance and to ensure safe operation continuity even when the distance to the service facility is long.
【０００２】[0002]
【従来の技術】乗用車用空気入りラジアルタイヤにつ
き、空気の抜けた状態にて所定の距離を相当程度の速度
で走行し得る、自己支持能力、いわゆるランフラット性
能を付与することは既知であってその改善提案について
特開平２−283508号公報には、ショアＡ硬さが65°前後
の硬いエラストマー的材料からなる大形のルーネット
（注；弦月形断面のサイド補強ゴム：環状断面部材）と
して、タイヤの側部の半径方向中心線の領域内に位置定
めされかつ環状断面部材の半径方向外端まで軸方向に伸
長する繊維状の補強要素を、少なくとも60°の角度にて
タイヤの円周方向に対して傾斜配置して成るものとする
ことが開示されている。2. Description of the Related Art It is known that a pneumatic radial tire for a passenger car is provided with a self-supporting ability, that is, a so-called run flat performance, capable of running a predetermined distance at a considerable speed in a state where air is deflated. Japanese Unexamined Patent Publication (Kokai) No. 2-283508 discloses a large lunet made of a hard elastomeric material having a Shore A hardness of about 65 ° (note: side-reinforcing rubber having a lunar cross section: annular cross section member). A fibrous reinforcing element positioned in the region of the radial centerline of the side of the tire and extending axially to the radially outer end of the annular cross-section member at an angle of at least 60 ° to the tire circle. It is disclosed that it is arranged to be inclined with respect to the circumferential direction.
【０００３】[0003]
【発明が解決しようとする課題】一般に空気入りラジア
ルタイヤはサイドウォール外表面における外傷、いわゆ
るサイドカットに対する抵抗に乏しいが、とくにランフ
ラット空気入りタイヤは空気圧力による支持を失ったと
き、これに伴うタイヤ幅の拡大の下でサイドカットを受
け易いうえ、サイドカットを生じると上記したようなサ
イド補強の配置の下でもなおカットの波及効果による、
サイド補強の破損、ひいてはランフラット機能の喪失に
至るうれいがある。In general, pneumatic radial tires have poor resistance to trauma on the outer surface of the sidewalls, so-called side cuts. In particular, run-flat pneumatic tires are subject to loss of support due to air pressure. It is easy to receive side cuts under the expansion of the tire width, and when side cuts occur, even under the side reinforcement arrangement as described above, due to the ripple effect of cuts,
The side reinforcement is broken, and the run-flat function is lost.
【０００４】そこで空気入りタイヤの充てん圧力による
輪重支持が失われたとき、それを肩代りする上記サイド
補強の一層有効な強化を図ること、それもとくに車両の
中心の方に面している側における空気入りタイヤのサイ
ドウォールでは車両のコーナリング走行中に曲率の向き
（符号）が反転する変形に伴い、上記サイド補強の硬質
ゴム層がインナーライナに面する弦側で増加する引張り
応力を受けて裂断することによるサイド補強の破損に対
して殊に有効な強化を実現することにより、空気入りタ
イヤのランフラット耐久寿命を向上した、ランフラット
空気入りタイヤを提案することがこの発明の目的であ
る。[0004] Therefore, when the wheel load support due to the filling pressure of the pneumatic tire is lost, the above-mentioned side reinforcement, which takes the place of the wheel support, is to be more effectively strengthened, and particularly, it faces the center of the vehicle. In the side wall of the pneumatic tire on the side, the hard rubber layer of the side reinforcement receives an increasing tensile stress on the chord side facing the inner liner due to the deformation in which the direction of curvature (sign) is reversed during cornering of the vehicle. An object of the present invention is to propose a run-flat pneumatic tire in which the run-flat durability life of a pneumatic tire is improved by realizing particularly effective reinforcement against breakage of side reinforcement due to splitting. It is.
【０００５】[0005]
【課題を解決するための手段】この発明はコードのトロ
イド状ラジアル排列になる少なくとも１プライのカーカ
スと、このカーカスのクラウン域を取囲んでその中央円
周線に対し比較的小角度のコード交差排列になる少なく
とも２層のベルトとを主補強とするほか、カーカスとそ
の全内周に沿うインナーライナーとの間でカーカスのサ
イド域にわたり実質的に弦月形断面を呈する、ＪＩＳ硬
さが65°〜88°の硬質ゴム層をサイド補強としてそなえ
ている、ランフラット空気入りラジアルタイヤにおい
て、サイド補強が、硬質ゴム層の厚み中心よりもタイヤ
の内方寄りの位置とインナーライナーとの間にて、少な
くとも硬質ゴム層のタイヤ半径方向の配置範囲にわたっ
て該方向に延びる繊維コード排列になる強化層を有する
ことを特徴とするランフラット空気入りラジアルタイヤ
であり、ここに強化層が、硬質ゴム層とインナーライナ
との界面に挟在する配置になること、また強化層が、硬
質ゴム層の半径方向内、外端を含めてそのカーカスとの
界面の少なくとも一部に沿う包み込み構造になること
が、より好ましい。SUMMARY OF THE INVENTION The present invention provides a carcass of at least one ply that provides a toroidal radial arrangement of cords and a cord intersection surrounding the crown area of the carcass and having a relatively small angle with respect to its central circumference. The main reinforcement is at least two layers of belts arranged in an array, and the JIS hardness is 65, which has a substantially lunar cross section over the side area of the carcass between the carcass and the inner liner along the entire inner circumference thereof. In run-flat pneumatic radial tires that have a hard rubber layer of ° to 88 ° as side reinforcement, the side reinforcement is between the inner side of the tire and the position closer to the inside of the tire than the center of thickness of the hard rubber layer. And a reinforcing layer in which fiber cords are arranged so as to extend in the tire radial direction at least over the range of the tire in the tire radial direction. A rat pneumatic radial tire, in which the reinforcing layer is located at the interface between the hard rubber layer and the inner liner, and the reinforcing layer includes the inner and outer ends of the hard rubber layer in the radial direction. It is more preferable to have a wrapping structure along at least a part of the interface with the carcass.
【０００６】さて図１にて、この発明に従うランフラッ
ト空気入りタイヤを右半分の断面で示し、図２に在来の
ランフラット空気入りタイヤの同様な断面をあらわし比
較に供した。FIG. 1 shows a run-flat pneumatic tire according to the present invention in a right half section, and FIG. 2 shows a similar cross-section of a conventional run-flat pneumatic tire for comparison.
【０００７】両図において１はコードのトロイド状ラジ
アル排列になる少なくとも１プライのカーカス、２はカ
ーカス１のクラウン域を取囲んでその中央周線に対し比
較的小角度のコード交差排列になる少なくとも２層のベ
ルトであり、３はカーカス１の全内周に沿うインナーラ
イナー、４はカーカス１のサイド域にわたってこれとイ
ンナーライナー３との間に介在するサイド補強で、図示
のように実質的に弦月形断面を呈するＪＩＳ硬さが65°
〜88°の硬質ゴム層からなるほか、５はトレッドゴム、
６はサイドゴム、７はビードコア、８はフイラーゴム、
９はチェファーゴムであり、これらの基本的な構成は両
タイヤに共通である。In both figures, 1 is at least one ply of carcass which results in a toroidal radial arrangement of cords, 2 at least surrounds the crown area of the carcass 1 and has a code crossing arrangement which is at a relatively small angle to its central circumference. A belt of two layers, 3 is an inner liner along the entire inner periphery of the carcass 1, 4 is a side reinforcement interposed between the carcass 1 and the inner liner 3 over the side area, and substantially as shown in the drawing. JIS hardness of 65 ° with a crescent cross section
In addition to a hard rubber layer of ~ 88 °, 5 is tread rubber,
6 is a side rubber, 7 is a bead core, 8 is a filler rubber,
Reference numeral 9 denotes a Chefer rubber, whose basic configuration is common to both tires.
【０００８】図２に示したところにつき、前掲の特開平
２−283508号公報にあっては硬質ゴム層（サイド補強ゴ
ム）につき、タイヤの側部の半径方向中心線の領域内に
位置定めされる補強要素の配置による強化に言及され、
この補強要素はサイド補強ゴムの肉厚中心それも上半部
への埋設をした例が図解されている。Referring to FIG. 2, in the above-mentioned Japanese Patent Application Laid-Open No. 2-283508, the hard rubber layer (side reinforcing rubber) is positioned within the radial center line area of the side of the tire. Reference to reinforcement by the placement of reinforcement elements,
An example is shown in which the reinforcing element is embedded in the center of the thickness of the side reinforcing rubber and also in the upper half.
【０００９】これに反してこの発明にあっては、図１に
明らかなように、サイド補強４が、硬質ゴム層の厚み中
心ｌよりもタイヤの内方寄りの位置とインナーライナ３
との間、より好ましくは硬質ゴム層とインナーライナ３
との界面で、少なくとも硬質ゴムのタイヤ半径方向の配
置範囲にわたって該方向に延びる繊維コード排列にな
る、強化層10を有するものとし、この場合強化層10は硬
質ゴム層のトレッド寄り上端並びにビードコアー７寄り
の下端からわずかにはみ出すか又は、硬質ゴム層とカー
カス１との間に折返して硬質ゴム層を少なくとも一部で
包み込むようになっていてもよい。On the other hand, in the present invention, as is apparent from FIG. 1, the side reinforcement 4 is provided at a position closer to the inside of the tire than the thickness center 1 of the hard rubber layer and the inner liner 3.
And more preferably between the hard rubber layer and the inner liner 3.
At the interface with the hard rubber layer, the reinforcing layer 10 becomes a fiber cord arrangement extending in the tire radial direction at least over the range of the tire radial direction. In this case, the reinforcing layer 10 has the upper end of the hard rubber layer near the tread and the bead core 7. The hard rubber layer may be slightly protruded from the lower end or folded back between the hard rubber layer and the carcass 1 to at least partially wrap the hard rubber layer.
【００１０】[0010]
【作用】この発明においてサイド補強４を構成する硬質
ゴムは、ＪＩＳ硬さが65°より軟かいと、パンクなどで
空気が抜けたときに輪重を肩代り支持する能力が不足
し、またＪＩＳ硬さが88°を越えると硬すぎて、サイド
ウォールの柔軟性を害するうれいがあるが、65°〜88°
の範囲内とすることにより、通常の走行条件下で不都合
を伴うことなく、パンクの際における走行時に必要な荷
重支持を成就するように、サイドウォールの曲げ剛性を
高めることができ、ここにこの発明を特色づける強化層
10によって、負荷能力の改善がもたらされる。In the present invention, if the hard rubber constituting the side reinforcement 4 has a JIS hardness of less than 65 °, the ability to support the wheel load when the air escapes due to puncture or the like is insufficient. If the hardness exceeds 88 °, it is too hard, and there is a detriment to harm the flexibility of the sidewall, but 65 ° to 88 °
By setting it within the range, it is possible to increase the bending rigidity of the side wall so as to achieve the necessary load support during running at the time of puncture without any inconvenience under normal running conditions. Reinforcement layer that features the invention
10 results in improved load capacity.
【００１１】強化層10は、硬質ゴム層のとくに厚み中心
よりもタイヤの内方寄りの位置とインナーライナー３と
の間、より好ましくは補強ゴム層とインナーライナー３
との間にて、少なくとも硬質ゴム層のタイヤ半径方向の
配置範囲にわたって該方向に延びる繊維コード排列にな
り、上記硬質ゴム層とともにサイド補強を構成してパン
ク時の負荷能力を高めるのに役立ち、ランフラットの際
におけるタイヤの幅拡がりを抑制してサイドカット損傷
を生じる機会を減じるほか、とくにランフラットの際に
おけるコーナリング時、車両の中心の方に面している側
における空気入りタイヤのサイドウォールの曲率の向き
が反転するような変形をもたらすべき硬質ゴム層の内面
における引張り力に有効に対抗し、該内面での交番的な
引張り応力による硬質ゴム層の内面疲労に由来するゴム
亀裂とその成長ひいては硬質ゴム層の折損を適切に防止
する。この作用は強化層10によって硬質ゴム層を包み込
むことにより、一層助長される。The reinforcing layer 10 is provided between the inner liner 3 and a position of the hard rubber layer, which is closer to the inside of the tire than the center of thickness, and more preferably the reinforcing rubber layer and the inner liner 3.
In between, it becomes a fiber cord arrangement extending in the tire radial direction at least over the arrangement range of the hard rubber layer, and serves to enhance the load capacity at the time of puncture by forming side reinforcement together with the hard rubber layer, The pneumatic tire sidewall on the side facing the center of the vehicle, especially when cornering during run flat, in addition to reducing the width of the tire during run flat and reducing the chance of side cut damage Effectively counteracts the tensile force on the inner surface of the hard rubber layer that should cause deformation such that the direction of the curvature of the rubber is reversed, rubber cracks caused by inner surface fatigue of the hard rubber layer due to alternating tensile stress on the inner surface and its cracks Properly prevent the growth and hence breakage of the hard rubber layer. This effect is further enhanced by enclosing the hard rubber layer with the reinforcing layer 10.
【００１２】[0012]
【実施例】図１，２に示した断面構造においてタイヤ製
造上の慣例に従い、サイズ275 ／40 ZR 17を同じくする
この発明のタイヤと在来タイヤとを試作しランフラット
性能を比較した。DESCRIPTION OF THE PREFERRED EMBODIMENTS In accordance with the conventional tire manufacturing method, a tire of the present invention having the same size of 275/40 ZR 17 and a conventional tire were manufactured on the cross-sectional structure shown in FIGS.
【００１３】ここにランフラット性能は、サイドウォー
ルに長さ25mmのカットを入れてカーカス１及び硬質ゴム
層表面に達する裂断きずを生じさせ、空気圧力は０の状
態、車速80Km／ｈでタイヤに破損を生じ走行不能になる
までのランフラット距離を指数表示であらわした。Here, the run flat performance is such that a cut having a length of 25 mm is made in the side wall to generate a tear without reaching the carcass 1 and the surface of the hard rubber layer, the air pressure is 0, the tire speed is 80 km / h. The run flat distance before the vehicle was damaged and became unable to run was expressed in an exponential format.
【００１４】この事例でカーカス１は２プライ90°配列
にてレーヨンを用いた繊維コードよりなり、ベルト２は
撚り構造１×５×0.23mmφであらわさせるスチールコー
ドを用い、硬質ゴム層のゴム硬度はＪＩＳ硬さ82°のも
のを用い、さらにこの発明に従う強化層10としては、芳
香族ポリアミドを用いた繊維コードをカーカスと同角度
にて打ち込み41本／50mmで配列したものである。In this case, the carcass 1 is made of a fiber cord using rayon in a two-ply 90 ° arrangement, the belt 2 is made of a steel cord having a twist structure of 1 × 5 × 0.23 mmφ, and the rubber hardness of the hard rubber layer Has a JIS hardness of 82 °, and as the reinforcing layer 10 according to the present invention, a fiber cord using an aromatic polyamide is driven at the same angle as the carcass and is arranged at 41/50 mm.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【発明の効果】この発明によれば従来のランフラットタ
イヤの耐久性能に比し、格段の向上改善がみられる。According to the present invention, a remarkable improvement and improvement can be seen as compared with the durability performance of the conventional run flat tire.
【図１】図１はこの発明のタイヤ断面図である。FIG. 1 is a sectional view of a tire according to the present invention.
【図２】図２は在来タイヤ断面図である。FIG. 2 is a sectional view of a conventional tire.
１ カーカス ２ ベルト ３ インナーライナー ４ サイド部補強 ５ トレッドゴム ６ サイドゴム ７ ビードコア ８ フィラーゴム ９ チェーファゴム 10 強化層 1 Carcass 2 Belt 3 Inner Liner 4 Side Reinforcement 5 Tread Rubber 6 Side Rubber 7 Bead Core 8 Filler Rubber 9 Chafa Rubber 10 Reinforcement Layer
Claims (3)
少なくとも１プライのカーカスと、このカーカスのクラ
ウン域を取囲んでその中央円周線に対し比較的小角度の
コード交差排列になる少なくとも２層のベルトとを主補
強とするほか、カーカスとその全内周に沿うインナーラ
イナーとの間でカーカスのサイド域にわたり実質的に弦
月形断面を呈する、ＪＩＳ硬さが65°〜88°の硬質ゴム
層をサイド補強としてそなえている、ランフラット空気
入りラジアルタイヤにおいて、 サイド補強が、硬質ゴム層の厚み中心よりもタイヤの内
方寄りの位置とインナーライナーとの間にて、少なくと
も硬質ゴム層のタイヤ半径方向の配置範囲にわたって該
方向に延びる繊維コード排列になる強化層を有すること
を特徴とする、ランフラット空気入りラジアルタイヤ。1. A carcass of at least one ply providing a toroidal radial arrangement of cords and at least two layers surrounding the crown area of the carcass and having a relatively small angle of code crossing with respect to its central circumference. Hard rubber with a JIS hardness of 65 ° to 88 °, with a belt and main reinforcement, and a substantially lunar cross section across the side area of the carcass between the carcass and the inner liner along the entire inner circumference. In a run-flat pneumatic radial tire having a layer as a side reinforcement, the side reinforcement is provided between the inner liner and a position closer to the inside of the tire than the thickness center of the hard rubber layer, and at least the hard rubber layer A run-flat pneumatic radial having a reinforcing layer that becomes a fiber cord arrangement extending in the tire radial direction arrangement range over the radial direction arrangement range. tire.
ーとの界面に挟在する配置になる請求項１に記載したラ
ンフラット空気入りラジアルタイヤ。2. The run-flat pneumatic radial tire according to claim 1, wherein the reinforcing layer is arranged so as to be interposed between the interface between the hard rubber layer and the inner liner.
半径方向内端とからそれぞれからはみ出す構造及び該は
み出し部を硬質ゴム層とカーカスとの間で折返して硬質
ゴム層を少なくとも一部で包み込む構造のいずれか一方
の構造を有する請求項１又は２に記載したタイヤ。3. A structure in which a reinforcing layer protrudes from a radially outer end and a radially inner end of a hard rubber layer, and the protruding portion is folded between the hard rubber layer and the carcass to form at least one hard rubber layer. 3. The tire according to claim 1, wherein the tire has one of a structure wrapped in a part. 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11616792A JP3157602B2 (en) | 1992-05-08 | 1992-05-08 | Runflat pneumatic radial tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11616792A JP3157602B2 (en) | 1992-05-08 | 1992-05-08 | Runflat pneumatic radial tires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05310013A JPH05310013A (en) | 1993-11-22 |
| JP3157602B2 true JP3157602B2 (en) | 2001-04-16 |
Family
ID=14680452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11616792A Expired - Fee Related JP3157602B2 (en) | 1992-05-08 | 1992-05-08 | Runflat pneumatic radial tires |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3157602B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5795416A (en) * | 1996-08-02 | 1998-08-18 | Michelin Recherche Et Technique | Run-flat tire having partial carcass layers |
| DE69727302T2 (en) * | 1997-05-26 | 2005-02-17 | Bridgestone Corp. | SAFETY TIRES |
| JP3546711B2 (en) | 1998-08-04 | 2004-07-28 | 東洋ゴム工業株式会社 | Run flat tire |
| EP1795376B1 (en) * | 2004-09-09 | 2010-02-24 | Toyo Tire & Rubber Co. Ltd. | Run flat tire and method of manufacturing run flat tire |
| JP2007153276A (en) * | 2005-12-08 | 2007-06-21 | Bridgestone Corp | Pneumatic run flat radial tire |
| JP5124524B2 (en) * | 2009-05-18 | 2013-01-23 | 株式会社ブリヂストン | Side-reinforced run-flat tire |
| JP5519467B2 (en) * | 2010-10-20 | 2014-06-11 | 株式会社ブリヂストン | Pneumatic radial tire |
| JP6268037B2 (en) * | 2014-05-19 | 2018-01-24 | 株式会社ブリヂストン | Run-flat radial tire |
| JP7287073B2 (en) * | 2019-04-04 | 2023-06-06 | 横浜ゴム株式会社 | motorcycle tire |
-
1992
- 1992-05-08 JP JP11616792A patent/JP3157602B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8637799B2 (en) | 2010-03-24 | 2014-01-28 | Japan Display Inc. | Imaging apparatus with lens array having densely arranged lens surfaces without a gap |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05310013A (en) | 1993-11-22 |
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