JPH05185812A - Pneumatic tire - Google Patents

Pneumatic tire

Info

Publication number
JPH05185812A
JPH05185812A JP2217992A JP2217992A JPH05185812A JP H05185812 A JPH05185812 A JP H05185812A JP 2217992 A JP2217992 A JP 2217992A JP 2217992 A JP2217992 A JP 2217992A JP H05185812 A JPH05185812 A JP H05185812A
Authority
JP
Japan
Prior art keywords
bead filler
bead
height
tire
carcass ply
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.)
Withdrawn
Application number
JP2217992A
Other languages
Japanese (ja)
Inventor
Osamu Kawaguchi
修 川口
Heijirou Kaei
平次郎 嘉永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Tire Corp
Original Assignee
Toyo Tire and Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Tire and Rubber Co Ltd filed Critical Toyo Tire and Rubber Co Ltd
Priority to JP2217992A priority Critical patent/JPH05185812A/en
Publication of JPH05185812A publication Critical patent/JPH05185812A/en
Withdrawn legal-status Critical Current

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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
    • B60C15/0607—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex comprising several parts, e.g. made of different rubbers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

PURPOSE:To secure a still more reconciliation of steering stability and riding quality as well as to improve the extent of performance of a high speed running tire. CONSTITUTION:In a pneumatic tire provided with a composite bead filler (6) with a first bead filler (6a), rolling up an edge of a carcass ply toward the outside from the inside around a bead tire (4), and extending outward in the radial direction between the inner carcass and a rolled carcass ply (1b) and consisting of hard rubber at the bead tire side, and a second bead filler (6b) consisting of relatively soft rubber in the outward, the first bead filler (6a) is set to be more than JIS A hardness 94 deg., and its dynamic elasticity is set to a range from 500 to 1000kgf/cm<2>. On the other hand, the second bead filler (6b) is set to 70-90 deg. in hardness and its dynamic elasticity to a range from 100 to 450kgf/cm<2>, respectively. Simultaneously with this, the height of the first bead filler is set to be less than 2/3 (h) to the height of the total bead filler and to a range from not less than 100mm to not more than 30mm, respectively.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は空気入りタイヤ、特にビ
ードワイヤに改良を加え、操縦安定性を保持しながら乗
心地を良好ならしめた空気入り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 tire, and more particularly to a pneumatic tire which is improved in bead wire so as to have good riding comfort while maintaining steering stability.

【０００２】[0002]

【従来の技術】空気入りラジアルタイヤのビード部構造
として従来、一般にカーカスと、カーカス巻上げ部との
間にその基部をビードワイヤに接して断面略三角形状の
単一ビードフイラーが配置されていた。2. Description of the Related Art Conventionally, as a bead structure of a pneumatic radial tire, a single bead filler having a generally triangular cross section has been generally arranged between a carcass and a carcass winding part, with its base being in contact with a bead wire.

【０００３】ところが単一ビードフイラーの場合、これ
にＪＩＳＡ硬度９０°以上の高硬質ゴムを用いるとき
は、操縦安定性は改良されるが、乗心地が悪化し、かと
云って一方、比較的軟質のゴムを用いるときは乗心地は
良好となるが操縦安定性が低下する傾向となるため、最
近では硬軟両ゴムの複合利用が試みられ、高硬度ゴムを
ビードワイヤ側に、そしてその外側に接して外方に軟質
ゴムを配置した複合ビードフイラーが用いられて来た。
特開平３−１６９７２５号公報は、かかる複合ビードフ
イラーを用いた空気入りラジアルタイヤであり、カーカ
ス巻上げ部や複合ビードフイラーの高さを特定し、硬質
ゴム部の軟質ゴム部との境界面における両端の高さ（Ha
及びHb) とカーカス巻上げ高さ（Hc) をHa＞Hc＞Hbとな
るよう設定することによってカーカス巻上げ部でのセパ
レーション発生の解消を図っている。However, in the case of a single bead filler, when a high hardness rubber having a JISA hardness of 90 ° or more is used for this, the steering stability is improved, but the riding comfort is deteriorated, while it is relatively soft. When rubber is used, riding comfort is good, but steering stability tends to decrease.Therefore, composite use of both hard and soft rubbers has recently been attempted, and high hardness rubber is contacted with the bead wire side and the outside to contact the outside. Composite bead fillers have been used with soft rubber on one side.
Japanese Unexamined Patent Publication (Kokai) No. 3-169725 is a pneumatic radial tire using such a composite bead filler, which specifies the height of a carcass winding portion or a composite bead filler and determines the height of both ends of a boundary surface between a hard rubber portion and a soft rubber portion. Sa (Ha
And Hb) and the carcass hoisting height (Hc) are set such that Ha>Hc> Hb, the separation of the carcass hoisting portion is eliminated.

【０００４】[0004]

【発明が解決しようとする課題】ところで、上記公報で
開示された空気入りタイヤは複合ビードフイラーを用
い、一応、操縦安定性と乗心地を改善するものである
が、そこで考慮された複合ビードフイラーの硬質ゴム部
等の高さは主としてビード部の耐久性を改良するためで
あり、特別に操縦安定性と乗心地を両立させるための配
慮は払われていない。By the way, the pneumatic tire disclosed in the above publication uses a composite bead filler to improve steering stability and riding comfort, but the hardness of the composite bead filler considered in the pneumatic tire is considered. The height of the rubber part and the like is mainly for improving the durability of the bead part, and no special consideration is given to achieving both steering stability and riding comfort.

【０００５】本発明は上述の如き実状に対処し、特に複
合ビードフイラーの硬，軟両ゴムの動的弾性率及びビー
ドフイラー全高さに占める硬質ゴム部高さの割合が操縦
安定性と乗心地の両立に影響する点に着目し、その適切
な範囲を見出すことにより両性能のより一層の両立を確
保し、高速走行用タイヤの性能の向上を増進することを
目的とするものである。The present invention copes with the above-mentioned situation, and in particular, the dynamic elastic moduli of both hard and soft rubbers of the composite bead filler and the ratio of the height of the hard rubber portion to the total height of the bead filler satisfy both steering stability and riding comfort. The purpose of the present invention is to improve the performance of high-speed running tires by ensuring the compatibility of both performances by focusing on the point that influences the above and finding an appropriate range thereof.

【０００６】[0006]

【課題を解決するための手段】即ち、上記目的に適合す
る本発明の特徴はカーカスプライ端部をタイヤ径方向内
方端に埋設したビードワイヤの周りに内側から外側に向
かって巻上げ、内側カーカスプライと、外側の巻上げた
カーカスプライとの間にビードワイヤ上からカーカスプ
ライ巻上げ端を越えて径方向外方に先細り状に延び、ビ
ードリング側に硬質ゴムよりなる第１ビードフイラー、
その外方に比較的軟質ゴムよりなる第２ビードフイラー
を有する複合ビードフイラーを配置した空気入りタイヤ
において、第１ビードフイラーをＪＩＳＡ硬度９４°以
上で、かつ動的弾性率は５００〜１０００kgf/cm2 、第
２ビードフイラーを硬度が７０〜９０°でかつ、動的弾
性率は１００〜４５０kgf/cm2 の範囲とすると共に、ビ
ードワイヤ上より全ビードフイラーの高さをｈ、第１ビ
ードフイラーの高さをａとするとき、ａ≦2/3hで、かつ
１０mm≦ａ≦３０mmの範囲となしたことにある。ここ
で、上記設定においてビードフイラーの全高はタイヤの
最大幅位置を上限とし、リムライン近傍を下限とする従
来の設計に準じて通常、設定される。That is, the feature of the present invention which meets the above-mentioned object is that the end portion of the carcass ply is wound up from the inside to the outside around the bead wire embedded in the inner end in the tire radial direction, and the inner carcass ply is wound. A first bead filler made of hard rubber on the bead ring side, extending radially outward from the top of the carcass ply winding end from above the bead wire between the outer winding carcass ply and
In a pneumatic tire having a composite bead filler having a second bead filler made of a relatively soft rubber on the outside thereof, the first bead filler has a JISA hardness of 94 ° or more and a dynamic elastic modulus of 500 to 1000 kgf / cm 2 , The hardness of the 2 bead filler is 70 to 90 ° and the dynamic elastic modulus is in the range of 100 to 450 kgf / cm 2 , and the height of all the bead fillers above the bead wire is h, and the height of the first bead filler is a. At this time, a ≦ 2 / 3h and 10 mm ≦ a ≦ 30 mm. Here, in the above setting, the total height of the bead filler is usually set according to a conventional design in which the maximum width position of the tire is the upper limit and the vicinity of the rim line is the lower limit.

【０００７】[0007]

【作用】上記の如く動的弾性率及び第１ビードフイラー
の高さを特定のものに設定するときは、ビードフイラー
上下部の動的弾性率の調和により操縦安定性と乗心地の
両立が達成されタイヤ性能の向上を得ることができる。When the dynamic elastic modulus and the height of the first bead filler are set to specific values as described above, both steering stability and riding comfort are achieved by the harmony of the dynamic elastic moduli of the upper and lower portions of the bead filler. An improvement in performance can be obtained.

【０００８】[0008]

【実施例】以下更に添付図面により本発明の具体的実施
例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

【０００９】図１は本発明に係る空気入りタイヤの１例
であり、（１）はカーカスブライで一対のサイドウォー
ル部（２）とトレッド（Ｔ）を備えたクラウン部（３）
をもち、径方向内方端にビードワイヤ（４）を埋設した
タイヤにおいて、両端部をビードワイヤ（４）の周りに
内側から外側に向かって巻上げられ、端部をサイドウォ
ール部（２）の比較的低い位置にあるリムストリップ部
（５）付近に止着している。FIG. 1 shows an example of a pneumatic tire according to the present invention. (1) is a carcass brie and a crown portion (3) having a pair of sidewall portions (2) and a tread (T).
In a tire having a bead wire (4) embedded at its radially inner end, both ends are wound around the bead wire (4) from the inside toward the outside, and the ends are relatively wound on the sidewall part (2). It is fastened near the rim strip portion (5) in the lower position.

【００１０】そして上記カーカスプライ（１）（以下単
にカーカスという）の内側カーカス（１ａ）と巻上げ部
（１ｂ）との間にビードワイヤ（４）上面よりタイヤ径
方向外側に上記カーカスの巻上げ部（１ｂ）先端を越え
て先細り状に延びて本発明の要部となるビードフイラー
（６）が配置されている。Then, between the inner carcass (1a) of the carcass ply (1) (hereinafter simply referred to as a carcass) and the hoisting portion (1b), the hoisting portion (1b) of the carcass is located radially outside the upper surface of the bead wire (4). ) A bead filler (6) that extends in a tapered shape beyond the tip and is an essential part of the present invention is arranged.

【００１１】このビードフイラー（６）は図示のように
ビードワイヤ（４）上面に接する略三角断面形状の第１
ビードフイラー（６ａ）と、その外方でカーカス巻上げ
端を越えて延びる先細りの略三角断面形状の第２ビード
フイラー（６ｂ）とによって形成されており、第１ビー
ドフイラー（６ａ）にはＪＩＳＡ硬度９４°以上の超高
硬度ゴムが用いられ、一方、第２ビードフイラー（６
ｂ）には硬度７０〜９０°位の前記ゴムに比し比較的軟
質の、通常、ビードフイラーに用いられているゴムが使
用されている。The bead filler (6) has a first triangular cross section which is in contact with the upper surface of the bead wire (4) as shown in the drawing.
It is formed by a bead filler (6a) and a second bead filler (6b) having a substantially triangular cross-section that is tapered outside and extends beyond the carcass winding end. The first bead filler (6a) has a JISA hardness of 94 ° or more. Ultra-high hardness rubber of the second bead filler (6
In b), a rubber which is relatively soft as compared with the rubber having a hardness of about 70 to 90 ° and which is usually used for a bead filler is used.

【００１２】また、前記カーカスは図示の如くチエーハ
ー（７）により被覆されている。しかして、上記の如き
構成において、ビードフイラー（６）は、更に第１ビー
ドフイラー（６ａ）では動的弾性率が５００〜１０００
kgf/cm2 であることが重要な要素となっており、また第
２ビードフイラー（６ｂ）では動的弾性率が１００〜４
５０kgf/cm2 の範囲にあることが重要な要素となってい
る。そして、この場合、第１ビードフイラー（６ａ）の
高さをａとするとき、ａは５m ＜ａ＜３５mmの範囲とす
ることが好ましく、そのときビードワイヤ上面よりのビ
ードフイラー（６）の全高さをｈとすれｈ≧1.5a換言す
ればａ≦2/3hの範囲とすることが好適である。しかも、
これらの範囲は、これを同時に満足することが好まし
く、何れか一方のみでは充分に所期の目的を達成すると
は云えない。The carcass is covered with a chainer (7) as shown in the figure. Therefore, in the above structure, the bead filler (6) has a dynamic elastic modulus of 500 to 1000 in the first bead filler (6a).
kgf / cm 2 is an important factor, and the second bead filler (6b) has a dynamic elastic modulus of 100-4.
It is an important factor to be in the range of 50 kgf / cm 2 . In this case, when the height of the first bead filler (6a) is a, it is preferable that a is in the range of 5m <a <35mm, and at that time, the total height of the bead filler (6) from the upper surface of the bead wire is h. Therefore, it is preferable that h ≧ 1.5a, in other words, a ≦ 2 / 3h. Moreover,
It is preferable that these ranges satisfy these at the same time, and it cannot be said that only one of them satisfies the intended purpose.

【００１３】以下、試験例によってこの点を明らかにす
る。 試験例 タイヤサイズ１７５／７０Ｒ１３のラジアルタイヤを使
用し、内圧2.0 kgf/cm2 , 車両１５００ccの使用条件
で、第１ビードフイラーと第２ビードフイラーの動的弾
性率を変えて操縦安定性，乗心地についてテストした。
その結果は下記表１に示す如くであった。なお、操縦安
定性，乗心地は当社実車テストコースにおいてコントロ
ールタイヤ（Ｂ）を５点として３名のパネラーにより官
能評価をした値であり、点数は大きい程、良好である。
また＋はより良好、−は稍以下を示す。Hereinafter, this point will be clarified by a test example. Test example Using radial tires of tire size 175 / 70R13, operating pressure 2.0 kgf / cm 2 , vehicle 1500 cc, the dynamic stability of the 1st bead filler and the 2nd bead filler are changed, and steering stability and riding comfort are changed. Tested
The results are shown in Table 1 below. The steering stability and riding comfort are the values obtained by sensory evaluation by three panelists with 5 points for the control tire (B) in our actual vehicle test course. The larger the score, the better.
Also, + means better, and-means less than or equal to.

【００１４】[0014]

【表１】 [Table 1]

【００１５】次に前記Ｄに該当するタイヤを用い、第１
ビードフイラーの高さ（ａ）を変えて操縦安定性ならび
に乗心地をテストした。結果は下記表２の如くであっ
た。なお、評価は前述と同じく当社実車テストコースに
おいてコントロールタイヤ（Ｂ）を５点として３名のパ
ネラーにより官能評価をした値であり、点数は大きい
程、良好である。 以下余白Next, using a tire corresponding to the above D, the first
The height (a) of the bead filler was changed to test the steering stability and riding comfort. The results are shown in Table 2 below. In addition, the evaluation is a value obtained by sensory evaluation by 3 panelists with 5 points for the control tire (B) in the actual vehicle test course as described above, and the larger the score, the better. Margin below

【００１６】[0016]

【表２】 [Table 2]

【００１７】上記表１及び表２より総合し、動的弾性率
及び第１ビードフイラーの高さが本発明の範囲にあると
きは、操縦安定性，乗心地共に良好であり、少なくとも
一方が欠けるときは操縦安定性又は乗心地の何れかにお
いて充分な効果が達成できないことが分かる。しかし勿
論、充分な効果が得られないとは云えコントロールタイ
ヤで得られる程度の操縦安定性ならびに乗心地は得られ
ることは表１，表２の示す通りである。In summary from Tables 1 and 2 above, when the dynamic elastic modulus and the height of the first bead filler are within the range of the present invention, both steering stability and riding comfort are good, and at least one is missing. It can be seen that no sufficient effect can be achieved in either the driving stability or the riding comfort. However, of course, as shown in Tables 1 and 2, it is possible to obtain the steering stability and the riding comfort to the extent that the control tire cannot obtain sufficient effects.

【００１８】[0018]

【発明の効果】本発明は以上のようにビードフイラーを
動的弾性率５００〜１０００kgf/cm2 の第１ビードフイ
ラーと、動的弾性率１００〜４５０kgf/cm2 の第２ビー
ドフイラーの上下硬度の異なる複合ビードフイラーと
し、かつ第１ビードフイラーの高さ（ａ）を１０mm以
上，３０mm以下でビードフイラー全高（ｈ）に対して1.
５ａ≦ｈの範囲に設定したため従来の単一のビードフイ
ラー使用のものに対しては勿論、硬度の異なる複合ビー
ドフイラーを用いた既知の空気入りタイヤに対しても操
縦安定性や乗心地の特性をより一層良好ならしめること
ができ、しかも第１ビードフイラーに動的弾性率５００
〜１０００kgf/cm2 の超高硬度ゴムを使用しているため
剛性の低下もなく、空気入りタイヤとして実用性能の向
上に寄与すること極めて大である。The invention above differently with first Bidofuira dynamic modulus 500~1000kgf / cm 2 to Bidofuira, the upper and lower hardness of the second Bidofuira dynamic modulus 100~450kgf / cm 2 composite, according to the present invention The bead filler is used, and the height (a) of the first bead filler is 10 mm or more and 30 mm or less with respect to the bead filler total height (h) 1.
Since it is set within the range of 5a ≦ h, the steering stability and the riding comfort characteristics are more improved not only for the conventional one using a single bead filler but also for a known pneumatic tire using a composite bead filler having different hardness. It can be made even better, and the first bead filler has a dynamic elastic modulus of 500.
Since ultra-high hardness rubber of up to 1000 kgf / cm 2 is used, there is no reduction in rigidity and it is extremely large that it contributes to improvement in practical performance as a pneumatic tire.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係る空気入りタイヤの１例を示す断面
説明図である。FIG. 1 is a cross-sectional explanatory view showing an example of a pneumatic tire according to the present invention.

【図２】本発明空気入りタイヤの要部に係るビードフイ
ラーの高さを示す説明図である。FIG. 2 is an explanatory view showing a height of a bead filler according to a main part of the pneumatic tire of the present invention.

【符号の説明】[Explanation of symbols]

（１） カーカスプライ （１ｂ）カーカスプライ巻上げ部 （４） ビードワイヤ （６） ビードフイラー （６ａ）第１ビードフイラー （６ｂ）第２ビードフイラー (1) Carcass ply (1b) Carcass ply winding part (4) Bead wire (6) Bead filler (6a) First bead filler (6b) Second bead filler

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 カーカスプライ端部をタイヤ径方向内方
端に埋設したビードワイヤの周りに内側から外側に向か
って巻上げ、内側カーカスプライと巻上げたカーカスプ
ライとの間にビードワイヤ上からカーカスプライ巻上げ
端を越えて径方向外方に先細り状に延び、ビードワイヤ
側に硬質ゴムよりなる第１ビードフイラー、その外方に
比較的軟質ゴムよりなる第２ビードフイラーを有する複
合ビードフイラーを配置した空気入りタイヤにおいて、
前記硬質ゴムよりなる第１ビードフイラーはＪＩＳＡ硬
度９４°以上で、その動的弾性率は５００〜１０００kg
f/cm2 であり、一方、比較的軟質ゴムよりなる第２ビー
ドフイラーは硬度が７０〜９０°でその動的弾性率は１
００〜４５０kgf/cm2 であると共に、前記第１ビードフ
イラーの高さａはビードワイヤ上より全ビードフイラー
の高さｈに対し2/3h以下で、かつ、１０mm以上、３０mm
以下の範囲であることを特徴とする空気入りタイヤ。1. A carcass ply winding-up end is wound up from the inside to the outside around a bead wire buried at the inner end in the tire radial direction of the carcass ply from the inside to the outside and between the inner carcass ply and the wound carcass ply. In a pneumatic tire in which a first bead filler made of hard rubber is provided on the bead wire side, and a composite bead filler having a second bead filler made of relatively soft rubber is arranged on the outer side of the first bead filler.
The first bead filler made of the hard rubber has a JIS A hardness of 94 ° or more and a dynamic elastic modulus of 500 to 1000 kg.
f / cm 2 , while the second bead filler made of relatively soft rubber has a hardness of 70-90 ° and a dynamic elastic modulus of 1
With a 00~450kgf / cm 2, the height a of the first Bidofuira in 2 / 3h or less with respect to the height h of the total Bidofuira than on the bead wire, and, 10 mm or more, 30 mm
A pneumatic tire having the following range.
JP2217992A 1992-01-10 1992-01-10 Pneumatic tire Withdrawn JPH05185812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2217992A JPH05185812A (en) 1992-01-10 1992-01-10 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2217992A JPH05185812A (en) 1992-01-10 1992-01-10 Pneumatic tire

Publications (1)

Publication Number Publication Date
JPH05185812A true JPH05185812A (en) 1993-07-27

Family

ID=12075572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2217992A Withdrawn JPH05185812A (en) 1992-01-10 1992-01-10 Pneumatic tire

Country Status (1)

Country Link
JP (1) JPH05185812A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100498017B1 (en) * 1999-11-26 2005-07-01 한국타이어 주식회사 Pneumatic tire having improved bead durability
JP2006341705A (en) * 2005-06-08 2006-12-21 Sumitomo Rubber Ind Ltd Pneumatic radial tire
US10583696B2 (en) 2014-12-09 2020-03-10 Bridgestone Americas Tire Operations, Llc Tire with bead regions having multiple bead fillers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100498017B1 (en) * 1999-11-26 2005-07-01 한국타이어 주식회사 Pneumatic tire having improved bead durability
JP2006341705A (en) * 2005-06-08 2006-12-21 Sumitomo Rubber Ind Ltd Pneumatic radial tire
US10583696B2 (en) 2014-12-09 2020-03-10 Bridgestone Americas Tire Operations, Llc Tire with bead regions having multiple bead fillers

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19990408