JPH09272314A - Pneumatic radial tire - Google Patents
Pneumatic radial tireInfo
- Publication number
- JPH09272314A JPH09272314A JP8640396A JP8640396A JPH09272314A JP H09272314 A JPH09272314 A JP H09272314A JP 8640396 A JP8640396 A JP 8640396A JP 8640396 A JP8640396 A JP 8640396A JP H09272314 A JPH09272314 A JP H09272314A
- Authority
- JP
- Japan
- Prior art keywords
- strain
- range
- elastic modulus
- bead
- rubber
- 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.)
- Pending
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
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、振動乗り心地性
及び操縦安定性の双方を両立させた空気入りラジアルタ
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 radial tire which achieves both vibration riding comfort and steering stability.
【０００２】[0002]
【従来の技術】乗用車用ラジアルタイヤは、一対のビー
ドコア間に跨がってトロイド状に延びるカーカスプライ
の本体部と、この本体部からビードコアの周りに巻き返
されるカーカスプライの折返し部との間の、ビードコア
直上位置からタイヤの最大幅位置付近にわたって硬質ゴ
ムからなるビードフィラーを配設するのが一般的であ
る。2. Description of the Related Art A radial tire for a passenger vehicle is provided between a body portion of a carcass ply extending in a toroidal shape across a pair of bead cores and a folded portion of the carcass ply which is rewound from the body portion around the bead core. In general, a bead filler made of hard rubber is arranged from the position directly above the bead core to the vicinity of the maximum width position of the tire.
【０００３】ところで、一般に操縦安定性を向上させる
には、タイヤの周方向剛性を高めることが有用であり、
また、振動乗り心地性を向上させるには、タイヤの半径
方向剛性を小さくすることが有用である。By the way, generally, in order to improve the steering stability, it is useful to increase the circumferential rigidity of the tire.
Further, in order to improve the vibration riding comfort, it is useful to reduce the radial rigidity of the tire.
【０００４】[0004]
【発明が解決しようとする課題】そのため、ビードフィ
ラーに硬質ゴムを使用する場合には、前記周方向剛性が
高まることによって操縦安定性については向上するもの
の、前記半径方向剛性も高まることになるため、振動乗
り心地性については悪化することになり、一方、ビード
フィラーに軟質ゴムを使用する場合には、振動乗り心地
性については向上するものの操縦安定性が悪化すること
になる。従って、一般には、操縦安定性と振動乗り心地
性とは二律相反する関係にあり、両者を両立させるのは
困難であるとされていた。Therefore, when hard rubber is used for the bead filler, the steering rigidity is improved by increasing the circumferential rigidity, but the radial rigidity is also increased. When the soft rubber is used for the bead filler, the vibration riding comfort is improved, but the steering stability is deteriorated. Therefore, it is generally said that steering stability and vibration riding comfort are in a trade-off relationship, and it is difficult to achieve both.
【０００５】本発明者は、操縦安定性と振動乗り心地性
の双方を満足させるための鋭意検討を行ったところ、以
下の知見を得、この知見を基に、操縦安定性と振動乗り
心地性の双方を満足させることに成功した。The inventor of the present invention has conducted extensive studies to satisfy both steering stability and vibration riding comfort, and has obtained the following knowledge. Based on this knowledge, steering stability and vibration riding comfort are obtained. It succeeded in satisfying both sides.
【０００６】すなわち、タイヤの負荷転動時において、
操縦安定性は、タイヤ周方向への変形量がビードフィラ
ーの部分の歪みにして通常は０〜２％の範囲であり、ま
た、振動乗り心地性は、タイヤ半径方向への変形量が、
ビードフィラーの部分の歪みにして通常は５〜８％の範
囲であることを見出し、この知見を基に、歪みが０〜２
％の範囲と５〜８％の範囲で、それぞれ適正な弾性率を
有するビードフィラーゴムを開発することに成功したの
である。That is, at the time of load rolling of the tire,
The steering stability is such that the deformation amount in the tire circumferential direction is usually in the range of 0 to 2% in terms of the strain of the bead filler, and the vibration riding comfort is the deformation amount in the tire radial direction,
It has been found that the strain of the bead filler is usually in the range of 5 to 8%, and the strain is 0 to 2 based on this finding.
We have succeeded in developing a bead filler rubber having an appropriate elastic modulus in the range of 5% and 5% to 8%, respectively.
【０００７】本発明の目的は、ビードフィラーのゴム特
性の適正化を図り、すなわち、ビードフィラーに、その
ゴム弾性率が、歪０〜２％の範囲で比較的大きくなり、
かつ、歪み５〜８％の範囲で比較的小さくなるゴム特性
を有する適正ゴムを用いることにより、操縦安定性と振
動乗り心地性の双方を満足させることができる空気入り
ラジアルタイヤを提供することにある。The object of the present invention is to optimize the rubber characteristics of the bead filler, that is, the rubber elastic modulus of the bead filler becomes relatively large in the range of 0 to 2% strain,
Also, to provide a pneumatic radial tire that can satisfy both steering stability and vibration riding comfort by using a proper rubber having a rubber characteristic that becomes relatively small in a strain range of 5 to 8%. is there.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明の空気入りラジアルタイヤは、一対のビード
コア間に跨がってトロイド状に延びるカーカスプライの
本体部と、この本体部からビードコアの周りに巻き返さ
れるカーカスプライの折返し部との間のビードコア直上
位置にビードフィラーを配設してなり、該ビードフィラ
ーの少なくとも一部に、弾性率が、歪０〜２％の範囲で
比較的大きく、かつ、歪み５〜８％の範囲で比較的小さ
いゴム特性を有する特殊ゴムを配設する。In order to achieve the above object, a pneumatic radial tire of the present invention has a carcass ply main body extending in a toroidal shape across a pair of bead cores, and a bead core from the main body. The bead filler is arranged at a position directly above the bead core between the folded portion of the carcass ply that is rewound around, and at least a part of the bead filler has a modulus of elasticity of 0 to 2% for comparison. A special rubber having relatively large rubber characteristics and relatively small strain in the range of 5 to 8% is arranged.
【０００９】尚、弾性率は、原則的にはJIS K 6254の引
張試験測定法によるが、次の点で試験条件が異なる。具
体的には、1mm ×1mm ×20mmの試験片を、初期応力及び
初期歪がともに０、引張速度が0.2mm/分、温度が25℃の
試験条件下で引っ張り試験を行い、応力−歪曲線を作成
し、この曲線に引いた接線の傾きから弾性率を求めるこ
ととした。例えば、歪１％のときの弾性率は、前記曲線
の歪１％の位置に接線を引き、この接線の傾きから求め
ることとする。以上を２個の試験片より行い、弾性率は
その平均値としている。The modulus of elasticity is basically determined by the tensile test measurement method of JIS K 6254, but the test conditions are different in the following points. Specifically, a 1 mm × 1 mm × 20 mm test piece was subjected to a tensile test under the test conditions of initial stress and initial strain of 0, a tensile speed of 0.2 mm / min, and a temperature of 25 ° C, to obtain a stress-strain curve. Was prepared, and the elastic modulus was determined from the slope of the tangent line drawn on this curve. For example, the elastic modulus at a strain of 1% is obtained by drawing a tangent line at the strain 1% position of the curve and from the slope of this tangent line. The above is performed from two test pieces, and the elastic modulus is the average value.
【００１０】また、弾性率が比較的大きいとは、具体的
には、通常、硬質ゴムの弾性率と同等程度又は硬質ゴム
の80％以上の弾性率を意味し、また、弾性率が比較的小
さいとは、具体的には、通常、軟質ゴムの弾性率と同等
程度又は硬質ゴムの弾性率の40％以下を意味する。The term "relatively large elastic modulus" generally means that the elastic modulus is usually about the same as that of hard rubber or 80% or more of hard rubber, and that the elastic modulus is relatively high. Specifically, the term “small” usually means that the elastic modulus is approximately the same as that of the soft rubber or 40% or less of the elastic modulus of the hard rubber.
【００１１】さらに、歪０〜２％の範囲での弾性率が50
〜70MPa の範囲、歪み５〜８％の範囲での弾性率が15〜
25MPa の範囲であり、かつ、歪０〜２％の範囲での弾性
率の、歪み５〜８％の範囲での弾性率に対する割合が２
〜５倍の範囲にあることが、より好適である。Further, the elastic modulus in the range of strain 0 to 2% is 50.
Elasticity in the range of ~ 70MPa and strain 5 ~ 8% is 15 ~
The ratio of the elastic modulus in the range of 25 MPa and strain 0 to 2% to the elastic modulus in the range of strain 5 to 8% is 2
More preferably, it is in the range of 5 times.
【００１２】[0012]
【発明の実施の形態】図１に、本発明に従う空気入りラ
ジアルタイヤの代表的な幅方向断面を有し、図中１は空
気入りラジアルタイヤ、２はビードコア、３はカーカス
プライ、４はビードフィラーである。この図のタイヤ１
は、一対のビードコア２間に跨がってトロイド状に延び
るカーカスプライ３の本体部３ａと、この本体部３ａか
らビードコア２の周りに巻き返されるカーカスプライ３
の折返し部３ｂとの間のビードコア直上位置にビードフ
ィラー４を配設したものである。1 shows a typical widthwise cross section of a pneumatic radial tire according to the present invention, in which 1 is a pneumatic radial tire, 2 is a bead core, 3 is a carcass ply, and 4 is a bead. It is a filler. Tire 1 in this figure
Is a main body portion 3a of a carcass ply 3 that extends in a toroidal shape across a pair of bead cores 2, and a carcass ply 3 that is rewound from the main body portion 3a around the bead core 2.
The bead filler 4 is arranged at a position directly above the bead core between the folded-back portion 3b.
【００１３】該ビードフィラー４には、その少なくとも
一部に、その弾性率が、歪０〜２％の範囲で比較的大き
く、かつ、歪み５〜８％の範囲で比較的小さいゴム特性
を有する特殊ゴム４ａを配設する。At least a part of the bead filler 4 has a rubber characteristic that its elastic modulus is relatively large in a strain range of 0 to 2% and relatively small in a strain range of 5 to 8%. A special rubber 4a is provided.
【００１４】この特殊ゴム４ａは、具体的には、歪０〜
２％の範囲での弾性率が50〜70MPaの範囲、歪み５〜８
％の範囲での弾性率が15〜25MPa の範囲であり、かつ、
歪０〜２％の範囲での弾性率の、歪み５〜８％の範囲で
の弾性率に対する割合が２〜５倍の範囲にある特性を有
する。Specifically, the special rubber 4a has a strain of 0 to
Elastic modulus in the range of 2% is in the range of 50 to 70 MPa, strain is 5 to 8
% Elastic modulus in the range of 15 to 25 MPa, and
It has a characteristic that the ratio of the elastic modulus in the strain range of 0 to 2% to the elastic modulus in the strain range of 5 to 8% is in the range of 2 to 5 times.
【００１５】尚、図１では、ビードフィラー４の全体に
特殊ゴム４ａを配置した場合を示したが、例えば、図２
に示すようにビードフィラー４の一部に特殊ゴム４ａを
配置してもよい。ビードフィラー４の一部に特殊ゴム４
ａを配置する場合には、ビードフィラー４に占める特殊
ゴム４ａの割合が35％以上であることが好ましく、ま
た、ビードフィラー４のタイヤ径方向外側に位置する部
分に特殊ゴム４ａを配置することが好ましい。Although FIG. 1 shows the case where the special rubber 4a is arranged on the entire bead filler 4, for example, FIG.
The special rubber 4a may be arranged on a part of the bead filler 4 as shown in FIG. Special rubber 4 as part of the bead filler 4
When arranging a, it is preferable that the ratio of the special rubber 4a in the bead filler 4 is 35% or more, and the special rubber 4a should be arranged in the portion of the bead filler 4 located on the outer side in the tire radial direction. Is preferred.
【００１６】このゴムは、例えば熱硬化型フェノール樹
脂、エチレン共用体を配合することが好ましい。It is preferable that the rubber is blended with, for example, a thermosetting phenolic resin or an ethylene compound.
【００１７】上述したところは、本発明の実施の形態の
一例を示したにすぎず、請求の範囲において、種々の変
更を加えることができる。The above is merely an example of the embodiment of the present invention, and various modifications can be made within the scope of the claims.
【００１８】[0018]
【実施例】次に、本発明に従う空気入りタイヤを試作
し、操縦安定性と振動乗り心地性の両性能を評価したの
で以下に説明する。実施例は、図１に示すタイヤ幅方向
断面を有し、タイヤサイズがPSR 195/65 R15であり、一
対のビードコア２間に跨がってトロイド状に延びるカー
カスプライ３の本体部３ａと、この本体部３ａからビー
ドコア２の周りに巻き返されるカーカスプライ３の折返
し部３ｂとの間のビードコア直上位置にビードフィラー
４を配設したものであり、ビードフィラー４の全体に、
その弾性率が、歪０〜２％の範囲で平均 55MPa、かつ、
歪み５〜８％の範囲で平均 18MPaである特殊ゴム４ａを
配設した。このときの、歪０〜２％の範囲での弾性率
の、歪み５〜８％の範囲での弾性率に対する割合は約３
倍である。EXAMPLES Next, a pneumatic tire according to the present invention was prototyped, and both performances of steering stability and vibration riding comfort were evaluated, which will be described below. The embodiment has a tire width direction cross section shown in FIG. 1, a tire size is PSR 195/65 R15, and a main body portion 3a of a carcass ply 3 extending in a toroidal shape across a pair of bead cores 2, The bead filler 4 is arranged at a position directly above the bead core between the body portion 3a and the folded-back portion 3b of the carcass ply 3 that is rewound around the bead core 2.
Its elastic modulus is 55 MPa on average in the range of 0 to 2% strain, and
A special rubber 4a having an average of 18 MPa in a strain range of 5 to 8% was arranged. At this time, the ratio of the elastic modulus in the strain range of 0 to 2% to the elastic modulus in the strain range of 5 to 8% is about 3
It is twice.
【００１９】この特殊ゴム4aの弾性率は、1mm ×1mm ×
20mmの試験片を、初期応力及び初期歪がともに０、引張
速度が0.2mm/分、温度が25℃の試験条件下で引っ張り試
験を行い、図３に示す応力−歪曲線に引いた接線の傾き
から求めた。歪み１％と５％のときのビードフィラー４
の弾性率を表１に示す。尚、その他の構造については、
通常の乗用車用タイヤとほぼ同等なものを用いた。The elastic modulus of this special rubber 4a is 1 mm × 1 mm ×
A 20 mm test piece was subjected to a tensile test under test conditions in which both initial stress and initial strain were 0, tensile rate was 0.2 mm / min, and temperature was 25 ° C., and the tangent line drawn on the stress-strain curve shown in FIG. Calculated from the slope. Bead filler 4 when strain is 1% and 5%
The elastic modulus of is shown in Table 1. For other structures,
Almost the same tires as ordinary passenger car tires were used.
【００２０】また、比較のため、歪５％の弾性率が50MP
a である硬質ゴムからなるビードフィラーを配置した従
来例と、歪５％の弾性率が10MPa である軟質ゴムからな
るビードフィラーを配置した比較例についても、同様に
歪み１％と５％のときのビードフィラー４の弾性率を求
めた。これらの弾性率についても表１に示してある。For comparison, the elastic modulus of 5% strain is 50MP.
For the conventional example in which a bead filler made of a hard rubber, which is a, and the comparative example in which a bead filler made of a soft rubber, which has a strain of 5% and an elastic modulus of 10 MPa, is placed, when the strain is 1% and 5%, The elastic modulus of the bead filler 4 of was determined. These elastic moduli are also shown in Table 1.
【００２１】（試験方法）上記各供試タイヤは、2000cc
クラスの前輪駆動の車両に装着し、この車両を走行させ
て、そのときの操縦安定性と振動乗り心地性について評
価した。尚、操縦安定性は、舗装路面を60〜100km/h で
走行させてフィーリング評価したものであり、また、振
動乗り心地性は、段差路・継ぎ目路・ベルジアン路を20
〜60km/hで走行させてフィーリング評価したものであ
り、いずれも従来例を基準にして性能を評価した。これ
らの評価結果についても表１に示す。(Test method) Each of the above-mentioned test tires is 2000 cc
It was mounted on a front-wheel drive vehicle of a class, and this vehicle was run to evaluate the steering stability and vibration riding comfort at that time. The driving stability was evaluated by driving the pavement at 60 to 100 km / h, and the vibration riding comfort was 20% on step roads, joint roads, and Belgian roads.
The performance was evaluated by running at ~ 60km / h, and the performance was evaluated based on the conventional example. The results of these evaluations are also shown in Table 1.
【００２２】[0022]
【表１】 [Table 1]
【００２３】表１の評価結果から、実施例は、操縦安定
性と振動乗り心地性の両性能とも従来例に比べて優れて
いる。From the evaluation results shown in Table 1, the embodiment is superior to the conventional example in both the steering stability and the vibration and riding comfort.
【００２４】[0024]
【発明の効果】本発明によって、操縦安定性と振動乗り
心地性の双方を満足した空気入りラジアルタイヤの提供
が可能になった。According to the present invention, it is possible to provide a pneumatic radial tire satisfying both steering stability and vibration riding comfort.
【図１】本発明に従う代表的な空気入りラジアルタイヤ
の幅方向断面図である。FIG. 1 is a cross-sectional view in the width direction of a typical pneumatic radial tire according to the present invention.
【図２】本発明に従う他の空気入りラジアルタイヤの幅
方向断面図である。図である。FIG. 2 is a widthwise sectional view of another pneumatic radial tire according to the present invention. FIG.
【図３】各試験片を一軸方向に引っ張ったときの応力−
歪曲線をプロットした図である。[Fig. 3] Stress when pulling each test piece in a uniaxial direction-
It is the figure which plotted the distortion curve.
1 空気入りラジアルタイヤ 2 ビードコア 3 カーカスプライ 3a カーカスプライ3 の本体部 3b カーカスプライ3 の折返し部 4 ビードフィラー 4a 特殊ゴム 1 Pneumatic radial tire 2 Bead core 3 Carcass ply 3a Carcass ply 3 body part 3b Carcass ply 3 folding part 4 Bead filler 4a Special rubber
Claims (2)
状に延びるカーカスプライの本体部と、この本体部から
ビードコアの周りに巻き返されるカーカスプライの折返
し部との間のビードコア直上位置にビードフィラーを配
設してなる空気入りラジアルタイヤにおいて、 該ビードフィラーの少なくとも一部に、弾性率が、歪０
〜２％の範囲で比較的大きく、かつ歪み５〜８％の範囲
で比較的小さいゴム特性を有する特殊ゴムを配設してな
ることを特徴とする空気入りラジアルタイヤ。1. A bead at a position directly above a bead core between a main body portion of a carcass ply extending in a toroidal shape across a pair of bead cores and a folded portion of the carcass ply which is rewound from the main body portion around the bead core. In a pneumatic radial tire provided with a filler, at least a part of the bead filler has an elastic modulus of 0 strain.
A pneumatic radial tire comprising a special rubber having relatively large rubber characteristics in the range of ˜2% and relatively small strain in the range of 5% to 8%.
a の範囲、歪み５〜８％の範囲での弾性率が15〜25MPa
の範囲であり、かつ、歪０〜２％の範囲での弾性率の、
歪み５〜８％の範囲での弾性率に対する割合が２〜５倍
の範囲にある請求項１に記載の空気入りラジアルタイ
ヤ。2. Elastic modulus in the range of 0-2% strain is 50-70MP
Elastic modulus of 15 to 25 MPa in the range of a and strain of 5 to 8%
And the elastic modulus in the range of 0 to 2% strain,
The pneumatic radial tire according to claim 1, wherein a ratio with respect to an elastic modulus in a strain range of 5 to 8% is in a range of 2 to 5 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8640396A JPH09272314A (en) | 1996-04-09 | 1996-04-09 | Pneumatic radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8640396A JPH09272314A (en) | 1996-04-09 | 1996-04-09 | Pneumatic radial tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09272314A true JPH09272314A (en) | 1997-10-21 |
Family
ID=13885910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8640396A Pending JPH09272314A (en) | 1996-04-09 | 1996-04-09 | Pneumatic radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09272314A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004042822A (en) * | 2002-07-12 | 2004-02-12 | Daicel Degussa Ltd | Rubber reinforced structure |
-
1996
- 1996-04-09 JP JP8640396A patent/JPH09272314A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004042822A (en) * | 2002-07-12 | 2004-02-12 | Daicel Degussa Ltd | Rubber reinforced structure |
| WO2004018234A1 (en) * | 2002-07-12 | 2004-03-04 | Daicel-Degussa Ltd. | Rubber-reinforced structure |
| JP4502569B2 (en) * | 2002-07-12 | 2010-07-14 | ダイセル・エボニック株式会社 | Rubber reinforcement structure |
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