JPH01141103A - Pneumatic radial tyre - Google Patents
Pneumatic radial tyreInfo
- Publication number
- JPH01141103A JPH01141103A JP62298341A JP29834187A JPH01141103A JP H01141103 A JPH01141103 A JP H01141103A JP 62298341 A JP62298341 A JP 62298341A JP 29834187 A JP29834187 A JP 29834187A JP H01141103 A JPH01141103 A JP H01141103A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- tread
- carcass
- tire
- less
- 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
- 239000011324 bead Substances 0.000 claims description 26
- 229920001971 elastomer Polymers 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 239000000806 elastomer Substances 0.000 claims description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Landscapes
- Tires In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、空気入りラジアルタイヤ、特に高内圧で使用
される乗用車用として好適に使用しうる空気入りラジア
ルタイヤに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pneumatic radial tire, particularly to a pneumatic radial tire that can be suitably used for passenger cars used under high internal pressure.
ラジアル方向に配列されたコードからなるカーカスと、
金属製のコードからなるベルトとを有する空気入りラジ
アルタイヤが、高速耐久性、耐パンク性、操縦安定性、
とりわけ、優れた低燃費性のために、乗用車用タイヤを
はじめとして広く使用されている。A carcass consisting of cords arranged in the radial direction,
Pneumatic radial tires with belts made of metal cords offer high-speed durability, puncture resistance, handling stability,
In particular, due to its excellent fuel efficiency, it is widely used in passenger car tires and other applications.
近年、この低燃費性の一層の改善が望まれ、タイヤの低
燃費化、従ってタイヤの転動抵抗を減少させるべく、多
くの研究がなされてきている。In recent years, there has been a desire to further improve fuel efficiency, and much research has been conducted to improve the fuel efficiency of tires and, therefore, to reduce the rolling resistance of tires.
空気入りラジアルタイヤの転勤抵抗を減少させるには、
従来、トレッドゴム等のゴム部材の低ヒステリシス化、
トレンドの２層化、カーカスプロファイルの最適化等が
知られており、さらに使用中の空気圧を高めることによ
って転勤抵抗が減少することから、高内圧使用により低
燃費化をはかることも行われてきている。To reduce the rolling resistance of pneumatic radial tires,
Conventionally, the hysteresis of rubber components such as tread rubber has been reduced,
It is well known that the trend is to create two layers, optimize the carcass profile, etc. Furthermore, increasing the air pressure during use reduces transfer resistance, so efforts are also being made to improve fuel efficiency by using high internal pressure. There is.
しかしながら、このような手段による低燃費化は、耐摩
耗性、操縦安定性などに悪影響を与えることが多く、特
に前記の高内圧の使用は、低燃費化を促進しうるものの
、乗心地を阻害し又タイヤ騒音を増す他、操縦安定性の
悪化を招来しやすい。However, improving fuel efficiency by such means often has a negative effect on wear resistance, steering stability, etc. In particular, the use of high internal pressure mentioned above may promote improved fuel efficiency, but it also impairs ride comfort. In addition to increasing tire noise, this also tends to lead to deterioration of steering stability.
本発明は、乗心地、タイヤ騒音及び操縦安定性の悪化を
防止しつつタイヤの低燃費化を達成でき、とくに高内圧
用タイヤとしての使用に適した空気入りラジアルタイヤ
を提供することを目的としている。An object of the present invention is to provide a pneumatic radial tire that is particularly suitable for use as a high internal pressure tire and can achieve low fuel consumption while preventing deterioration of riding comfort, tire noise, and steering stability. There is.
本発明は、半径方向にコードを配列した少なくとも１ブ
ライのコード層からなるカーカス、該カーカスを係止す
る一対のビードコアを具えるビード部、カーカスの半径
方向外方に設ける環状のトレンド、該環状のトレッドの
両端から前記ビード部に延在するサイドウオール及びカ
ーカスとトレッドとの間に周方向に延在するベルトとを
有する空気入りラジアルタイヤであって、しかもベルト
が少なくとも２ブライ以上の金属製のベルトコードを平
行に配列したコード層からなり、ベルトコードは４本以
下の素線の撚り合わせ体でありかつ素線の直径が０．２
２ｍ以下であってしかも、ベルトの巾１ｕ当たりのベル
トコード打込み本数が１゜０以下である、空気入りラジ
アルタイヤである。The present invention relates to a carcass consisting of at least one cord layer in which cords are arranged in the radial direction, a bead portion comprising a pair of bead cores for locking the carcass, an annular trend provided radially outward of the carcass, and the annular trend. A pneumatic radial tire having a sidewall extending from both ends of the tread to the bead portion, and a belt extending circumferentially between the carcass and the tread, the belt being made of metal with at least 2 briars or more. The belt cord consists of a cord layer in which belt cords are arranged in parallel, and the belt cord is a twisted body of four or less strands, and the diameter of the strands is 0.2.
This is a pneumatic radial tire having a length of 2 m or less and in which the number of belt cords inserted per 1 u of belt width is 1° or less.
空気圧を高めるに従って、タイヤの転勤抵抗は減少する
とはいえ、タイヤ全体の縦剛性が増加することにより乗
心地が悪化し、タイヤ騒音が増加するとともに操縦安定
性が低下する。これは、従来の空気入りラジアルタイヤ
では、トレッドのベルトによるタガ効果を高めることを
意図して、周方向剛性を高めているが、その結果、トレ
ッドと直角な面外曲げ剛性をも大となっていることに由
来する。この面外曲げ剛性の増大は、負荷時におけるタ
イヤの撓みを、サイドウオール部に集中させがちとなる
。しかも空気圧の増大はさらにタイヤ全体の縦剛性を大
とし、半径方向の撓みが減少することによって路面から
の衝撃の吸収効果を低下させるとともに、コーナリング
時におけるタイヤバランスをくずしタイヤのコーナリン
グ特性を悪化させるのである。Although the rolling resistance of the tire decreases as the air pressure increases, the longitudinal stiffness of the entire tire increases, resulting in poor riding comfort, increased tire noise, and decreased steering stability. This is because in conventional pneumatic radial tires, the circumferential rigidity is increased with the intention of increasing the hoop effect of the tread belt, but as a result, the out-of-plane bending rigidity perpendicular to the tread also increases. It comes from the fact that This increase in out-of-plane bending rigidity tends to cause tire deflection under load to be concentrated in the sidewall portion. Furthermore, an increase in air pressure further increases the longitudinal stiffness of the entire tire, reducing radial deflection, which reduces the impact absorption effect from the road surface, and also disrupts the tire balance during cornering, worsening the tire's cornering characteristics. It is.
本発明（よ、このような事実を前提として前記問題点を
解決するべく研究を行った結果、ベルトに金属製のベル
トコードを配し、このベルトコードの素線数と素線径と
打入本数を所定の範囲とすることにより、ベルトのタガ
効果を維持しつつトレッドの面外曲げ剛性を減少させ、
たとえ高内圧で使用するときにも、乗心地、タイヤ騒音
及び操縦安定性の低下を抑制しうろことを見出し、完成
したものである。The present invention (as a result of conducting research to solve the above problems based on these facts), a metal belt cord is arranged on the belt, and the number of strands of the belt cord, the diameter of the strands, and the By setting the number within a predetermined range, the out-of-plane bending rigidity of the tread can be reduced while maintaining the hoop effect of the belt.
We have discovered and completed a system that suppresses the deterioration of ride comfort, tire noise, and steering stability even when used at high internal pressures.
以下本発明の一実施例を図面に基づき説明する。An embodiment of the present invention will be described below based on the drawings.
正規リムＲに組まれかつ正規内圧を充填された状態を示
す第１図において、タイヤ１は、カーカス３と、金属ワ
イヤからなる一対のビードコア４．４を有するビード部
５．５と、カーカスの半径方向外方に配した環状のトレ
ッド６と、前記ビード部５とトレッド６両側とを継ぐサ
イドウオール７．７とを有し、カーカス３のタイヤ半径
方向外方にはベルト９を設けるとともに、ビード部５に
は、ビードコア４．４からタイヤ半径方向外方にのびる
ビードエーペックス１０．１０が配置される。In FIG. 1, which shows the tire 1 assembled on a regular rim R and filled with a regular internal pressure, the tire 1 includes a carcass 3, a bead portion 5.5 having a pair of bead cores 4.4 made of metal wire, and a carcass. It has an annular tread 6 disposed outward in the radial direction, and sidewalls 7.7 connecting the bead portion 5 and both sides of the tread 6, and a belt 9 is provided outward in the tire radial direction of the carcass 3, A bead apex 10.10 is arranged in the bead portion 5 and extends radially outward from the bead core 4.4.
前記カーカス３は、合成樹脂等の有機又は金属等の無機
繊維コードを半径方向に配列した少なくともｌプライの
コード層からなり、又該カーカス３は、サイドウオール
７、トレッド６を通りビード部５のビードコア４で巻返
されることにより、本体部３Ａと巻返し部３Ｂとを形成
し、又本体部３Ａと巻返し部３Ｂとの間を充填する前記
ビードエペックス１０が配置される。The carcass 3 is made up of at least 1 ply of cord layers in which organic fiber cords such as synthetic resin or inorganic fiber cords such as metal are arranged in the radial direction. By being wound around the bead core 4, the bead epex 10 forms the main body portion 3A and the wound portion 3B, and the bead epex 10 is arranged to fill the gap between the main body portion 3A and the wound portion 3B.
又前記ベルト９は、本例ではカーカス３側に位置する内
側プライ９ａとその外側に配される外側プライ９ｂとを
有し、各プライ９ａ、９ｂは、夫々平行かつ周方向に対
し１０〜３５°の角度で傾斜してベルトコード１１を配
したコード層により形成される。又内側プライ９ａのベ
ルトコード１１と外側プライ９ｂのベルトコード１１は
互いに交差する向きに配列されている。ベルトコード１
１は、ステンレス鋼等の金属材からなる素＆１１２−・
−・の撚り合わせ体であって、各ベルトコード１１の素
線１２−の本数Ｎは第２図に示すごと（，４本以下、本
例では４本としている。又各素線１２の直径りは、０．
２２ｍ以下とする。さらに第３図に示すように、各プラ
イ９ａ、９ｂにおいて、タイヤ軸方向断面におけるベル
トコード１１の総本数Ｍを、タイヤ軸方向断面における
各プライ９ａ、９ｂに沿って測った該プライ９ａ、９ｂ
の巾ｆ（ｓ＋―）で除したベルトコード１１の単位長さ
（ａｍ）当たりの打込み本数Ｓ （Ｍ＃ｔ）は１．０以
下である。In this example, the belt 9 has an inner ply 9a located on the carcass 3 side and an outer ply 9b disposed outside of the inner ply 9a, and each ply 9a, 9b is parallel and has a diameter of 10 to 35 It is formed by a cord layer in which belt cords 11 are arranged inclined at an angle of .degree. Furthermore, the belt cords 11 of the inner ply 9a and the belt cords 11 of the outer ply 9b are arranged in a direction that intersects with each other. belt cord 1
1 is a base &112- made of metal material such as stainless steel.
The number N of the strands 12- of each belt cord 11 is as shown in FIG. Ri is 0.
The length shall be 22m or less. Furthermore, as shown in FIG. 3, in each ply 9a, 9b, the total number M of belt cords 11 in the tire axial cross section is measured along each ply 9a, 9b in the tire axial cross section.
The number S (M#t) of belt cords 11 driven per unit length (am) divided by the width f (s+-) is 1.0 or less.
即ち
Ｎ≦４
Ｄ≦０．２２ｍ
５≦１．０
である、ここで、Ｎが４本より大であり、又素線１２の
直径りを０．２２ ｓｍより大とした場合は、いずれも
ボード自体の曲げ剛性が増加し、目的を達せらないこと
が判明している。又打込み本数Ｓが１．０より大の場合
も、ベルト９の面外曲げ剛性が高くなり、路面からの衝
撃を吸収しえず、乗心地、操縦安定性等を害する。That is, N≦4 D≦0.22m 5≦1.0, where N is larger than 4, and when the diameter of the strands 12 is larger than 0.22 sm, both It has been found that the bending stiffness of the board itself increases, defeating the purpose. Also, when the number of driving strokes S is greater than 1.0, the out-of-plane bending rigidity of the belt 9 becomes high, and the impact from the road surface cannot be absorbed, which impairs riding comfort, steering stability, etc.
さらにトレッド６は、キャップトレッド６ａと、ベース
トレッド６ｂからなる２層体であって、ベーストレッド
６ｂはベルト９に接してその外側に配され、又キャップ
トレッド６ａは、前記ベーストレッド６ｂを覆ってその
外方に配置される。ベーストレッド６ｂは、ＪＩＳＡ硬
度を５１度以下とすることにより、トレンド剛性を減じ
る。又好ましくは、低ヒステリシス性のゴムを用いる。Furthermore, the tread 6 is a two-layered body consisting of a cap tread 6a and a base tread 6b, the base tread 6b being arranged on the outside in contact with the belt 9, and the cap tread 6a covering the base tread 6b. placed outside of it. The base tread 6b has a JISA hardness of 51 degrees or less to reduce trend rigidity. Preferably, a rubber with low hysteresis is used.
なおキャンプトレッド９ａは、通常のＪＩＳＡ硬度５７
度〜６６度のゴムを用いて耐摩耗性等を維持する。The camp tread 9a has a normal JISA hardness of 57.
Abrasion resistance etc. are maintained by using rubber with a temperature of 66 degrees to 66 degrees.
さらに赤道面ＣＬ上のトレッドの全厚さＴとベーストレ
ンド９ｂの厚さＴｂの比Ｔｂ／Ｔを０．２〜０．５の範
囲とする。０．２以下では、前記２層トレッドの効果が
生じにくく、０．５以上では摩耗末期にベーストレッド
９ｂが、トレッド表面に露出し、摩耗及び走行性能に悪
影響をおよぼす。Further, the ratio Tb/T of the total thickness T of the tread on the equatorial plane CL to the thickness Tb of the base trend 9b is set in a range of 0.2 to 0.5. If it is less than 0.2, the effect of the two-layer tread is unlikely to occur, and if it is more than 0.5, the base tread 9b will be exposed on the tread surface at the end of wear, adversely affecting wear and running performance.
前記ビードエーペックス１０．１０は、ＪＩＳＡ硬度８
６度以下のゴムエラストマーを用いており、タイヤ軸方
向断面においてその中心線Ｓに沿って測った長さしを、
タイヤ有効高さＨの０．１〜０．４倍の範囲としている
。The bead Apex 10.10 has a JISA hardness of 8.
Rubber elastomer with a diameter of 6 degrees or less is used, and the length measured along the center line S in the axial cross section of the tire is:
The range is 0.1 to 0.4 times the effective tire height H.
通常、ビードエーペックスは、タイヤの横剛性を増し、
操縦安定性を向上させる働きがあるが、高内圧で使用す
る場合、タイヤ全体の横剛性が増、加するため、エーペ
ックスの硬さ、長さしを減じても、操縦安定性の低下は
少なく、ビード部の曲げ剛性を低下せしめることにより
、操縦安定性、乗心地等を高めることができるのが判明
している。Typically, bead apex increases the lateral stiffness of the tire,
It works to improve handling stability, but when used at high internal pressure, the lateral rigidity of the entire tire increases, so even if the apex stiffness and length are reduced, there is little decrease in handling stability. It has been found that steering stability, riding comfort, etc. can be improved by reducing the bending rigidity of the bead portion.
ビードエーペックス１０のＪＩＳＡ硬度が８７度よす大
、又エーペックス１０の長さＬが有効タイヤ高さＨの０
．４倍を越えるときは、前記効果の度合を減じる。なお
ここで有効タイヤ高さＨとは正規リムＲに組まれ、内圧
を充填されたタイヤにおいて、リムフランジ上端位置か
らトレッド６の中央部までのタイヤ半径方向距離をいい
、又高内圧とは、２．２ｋｇ／−以上の内圧をいう。The JISA hardness of Bead Apex 10 is 87 degrees, and the length L of Apex 10 is 0 of the effective tire height H.
．． When it exceeds 4 times, the degree of the above effect is reduced. Note that the effective tire height H here refers to the distance in the tire radial direction from the upper end of the rim flange to the center of the tread 6 in a tire assembled on a regular rim R and filled with internal pressure. Refers to an internal pressure of 2.2 kg/- or more.
タイヤサイズ１６５／７０Ｒ１３のタイヤを第１表で示
す仕様により製作し、各種の測定を行った。又第１表の
比較例の欄に示す従来タイヤについて同様にテストを行
った。A tire with a tire size of 165/70R13 was manufactured according to the specifications shown in Table 1, and various measurements were performed. Further, the conventional tires shown in the Comparative Example column of Table 1 were similarly tested.
第１表に示す騒音、乗心地性及び操縦性は、各タイヤを
排気量１２００ｃｃの国産乗用車に装着し、テストコー
スを走行させ、ドライバーのフィーリングを１０点法に
より評価した。数値の大きい程・良好な結果を示す、又
転動抵抗は、各タイヤを室内台上ドラム試験により測定
した値を指数で表わした。数値が大きい程転勤抵抗が大
きいことを示す。The noise, ride comfort, and maneuverability shown in Table 1 were evaluated by mounting each tire on a domestic passenger car with a displacement of 1200 cc, driving it on a test course, and evaluating the driver's feeling using a 10-point scale. The larger the number, the better the result.For rolling resistance, the value measured by an indoor bench drum test for each tire was expressed as an index. The larger the value, the greater the resistance to transfer.
本発明によるタイヤは、騒音、乗心地性、操縦性及び転
勤抵抗においてバランスのとれた優れた性能を示した。The tire according to the present invention exhibited well-balanced and excellent performance in terms of noise, ride comfort, maneuverability, and rolling resistance.
又タイヤを高内圧で使用した場合のＩｌ音、乗心地性に
ついても、従来タイヤを通常内圧で使用した場合と同等
の結果を示し、転勤抵抗は従来タイヤを高内圧で使用し
た場合と路間等の結果を示した。In addition, the noise and ride comfort when tires are used at high internal pressures are the same as when conventional tires are used at normal internal pressures, and the rolling resistance is lower than when conventional tires are used at high internal pressures. The following results were shown.
このように本発明により、特に高内圧使用におけるタイ
ヤの諸問題を解決し、低燃費化を達成することができた
。As described above, the present invention has been able to solve various problems with tires, especially when using high internal pressures, and achieve low fuel consumption.
第１図は本発明の空気入りラジアルタイヤの一実施例を
示すタイヤ軸方向の断面図、第２図はベルトコードを例
示する断面図、第３図はベルト部を示す拡大断面図であ
る。
３・−・−・カーカス、 ４・−・−・ビードコア、
５−−−一・ビード部、 ６・−・トレッド、６ａ・
−・キャップトレッド、 ６ｂ−・−ペーストレッド
、７−・・・サイドウオール、 ９−・ベルト、１０
・−・・ビードエーペックス、
Ｈ−・−・有効タイヤ高さ、
Ｌ・−・ビードエーペックスの長さ、 Ｒ−・リム。
特許出願人 住友ゴム工業株式会社代理人 弁理
士 苗 村 正FIG. 1 is a sectional view in the tire axial direction showing one embodiment of the pneumatic radial tire of the present invention, FIG. 2 is a sectional view illustrating a belt cord, and FIG. 3 is an enlarged sectional view showing a belt portion. 3・−・−・Carcass, 4・−・−・Bead core,
5---1.Bead part, 6.-.Tread, 6a.
- Cap tread, 6b- Paste tread, 7- Side wall, 9- Belt, 10
--- Bead apex, H--- Effective tire height, L-- Length of bead apex, R-- Rim. Patent applicant Sumitomo Rubber Industries Co., Ltd. Agent Patent attorney Tadashi Naemura
Claims (3)
のコード層からなるカーカス、該カーカスを係止する一
対のビードコアを具えるビード部、カーカスの半径方向
外方に設ける環状のトレッド、該環状のトレッドの両端
から前記ビード部に延在するサイドウォール及びカーカ
スとトレッドとの間に周方向に延在するベルトを有する
空気入りラジアルタイヤであって、ベルトが下記の特徴
を有する空気入りラジアルタイヤ。 （ａ）少なくとも２プライ以上の金属製のベルトコード
を平行に配列したコード層からなること。 （ｂ）ベルトコードは４本以下の素線の撚り合わせ体か
らなること。 （ｃ）素線の直径が０．２２ｍｍ以下であること。 （ｄ）ベルトの巾１ｍｍ当たりのベルトコード打込み本
数が１．０以下であること。(1) A carcass consisting of at least one ply cord layer with cords arranged in the radial direction, a bead portion comprising a pair of bead cores for locking the carcass, an annular tread provided radially outward of the carcass, A pneumatic radial tire having sidewalls extending from both ends of the tread to the bead portion and a belt extending in the circumferential direction between the carcass and the tread, the belt having the following characteristics. (a) Consists of a cord layer in which at least two or more plies of metal belt cords are arranged in parallel. (b) The belt cord shall consist of a strand of four or less strands. (c) The diameter of the wire is 0.22 mm or less. (d) The number of belt cords inserted per 1 mm of belt width is 1.0 or less.
ＪＩＳＡ硬度が５１度以下のベーストレッドと、該ベー
ストレッドの外側に位置するキャップトレッドとからな
るとともに、赤道面上でのトレッドの全厚さＴに対する
ベーストレッドの厚さＴｂの比Ｔｂ／Ｔが０．２〜０．
５の範囲にあることを特徴とする特許請求の範囲第１項
記載の空気入りラジアルタイヤ。(2) The annular tread consists of a base tread located outside the belt and having a JISA hardness of 51 degrees or less, and a cap tread located outside the base tread, and the total thickness of the tread on the equatorial plane. The ratio Tb/T of the base tread thickness Tb to the base tread thickness T is 0.2 to 0.
5. The pneumatic radial tire according to claim 1, characterized in that the pneumatic radial tire is in the range of 5.
外方にのびかつほぼ三角形の先細り断面形状を有すると
ともにＪＩＳＡ硬度８６度以下のゴムエラストマーから
なりしかも中心線に沿う長さがタイヤ有効高さＨの０．
１〜０．４倍の範囲としたビードエーペックスを有する
ことを特徴とする特許請求の範囲第１項又は第２項記載
の空気入りラジアルタイヤ。(3) The bead portion extends outward in the tire radial direction from the bead core, has a tapered approximately triangular cross-sectional shape, and is made of rubber elastomer with a JISA hardness of 86 degrees or less, and the length along the center line is the tire effective height H. 0.
The pneumatic radial tire according to claim 1 or 2, characterized in that it has a bead apex in the range of 1 to 0.4 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62298341A JP2573260B2 (en) | 1987-11-25 | 1987-11-25 | Pneumatic radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62298341A JP2573260B2 (en) | 1987-11-25 | 1987-11-25 | Pneumatic radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01141103A true JPH01141103A (en) | 1989-06-02 |
| JP2573260B2 JP2573260B2 (en) | 1997-01-22 |
Family
ID=17858417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62298341A Expired - Fee Related JP2573260B2 (en) | 1987-11-25 | 1987-11-25 | Pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2573260B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03143703A (en) * | 1989-10-27 | 1991-06-19 | Sumitomo Rubber Ind Ltd | Radial tire |
| JPH03204307A (en) * | 1989-12-29 | 1991-09-05 | Sumitomo Rubber Ind Ltd | Radial tire for passenger car |
| JPH11310019A (en) * | 1998-04-30 | 1999-11-09 | Bridgestone Corp | Pneumatic tire for passenger car |
| US8146339B2 (en) | 2005-10-31 | 2012-04-03 | Bridgestone Corporation | Steel cord for reinforcing rubber article and pneumatic radial tire |
| US8863801B2 (en) | 2005-09-27 | 2014-10-21 | Bridgestone Corporation | Pneumatic radial tire |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5224882U (en) * | 1975-08-09 | 1977-02-22 | ||
| JPS5766003A (en) * | 1980-10-03 | 1982-04-22 | Toyo Tire & Rubber Co Ltd | Radial tire for automobile |
| JPS57194104A (en) * | 1981-05-22 | 1982-11-29 | Sumitomo Rubber Ind Ltd | Double-layer tread radial tyre |
| JPS59153605A (en) * | 1983-02-18 | 1984-09-01 | Yokohama Rubber Co Ltd:The | Low rolling resistance tire |
| JPS59220403A (en) * | 1983-05-30 | 1984-12-11 | Yokohama Rubber Co Ltd:The | Steel radial tire |
-
1987
- 1987-11-25 JP JP62298341A patent/JP2573260B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5224882U (en) * | 1975-08-09 | 1977-02-22 | ||
| JPS5766003A (en) * | 1980-10-03 | 1982-04-22 | Toyo Tire & Rubber Co Ltd | Radial tire for automobile |
| JPS57194104A (en) * | 1981-05-22 | 1982-11-29 | Sumitomo Rubber Ind Ltd | Double-layer tread radial tyre |
| JPS59153605A (en) * | 1983-02-18 | 1984-09-01 | Yokohama Rubber Co Ltd:The | Low rolling resistance tire |
| JPS59220403A (en) * | 1983-05-30 | 1984-12-11 | Yokohama Rubber Co Ltd:The | Steel radial tire |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03143703A (en) * | 1989-10-27 | 1991-06-19 | Sumitomo Rubber Ind Ltd | Radial tire |
| JPH03204307A (en) * | 1989-12-29 | 1991-09-05 | Sumitomo Rubber Ind Ltd | Radial tire for passenger car |
| JPH11310019A (en) * | 1998-04-30 | 1999-11-09 | Bridgestone Corp | Pneumatic tire for passenger car |
| US8863801B2 (en) | 2005-09-27 | 2014-10-21 | Bridgestone Corporation | Pneumatic radial tire |
| US8146339B2 (en) | 2005-10-31 | 2012-04-03 | Bridgestone Corporation | Steel cord for reinforcing rubber article and pneumatic radial tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2573260B2 (en) | 1997-01-22 |
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