JP2565953B2 - Radial tire - Google Patents
Radial tireInfo
- Publication number
- JP2565953B2 JP2565953B2 JP62304077A JP30407787A JP2565953B2 JP 2565953 B2 JP2565953 B2 JP 2565953B2 JP 62304077 A JP62304077 A JP 62304077A JP 30407787 A JP30407787 A JP 30407787A JP 2565953 B2 JP2565953 B2 JP 2565953B2
- Authority
- JP
- Japan
- Prior art keywords
- tire
- rubber
- tread
- rigidity
- axial direction
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、タイヤ軸方向とタイヤ半径方向の複素弾性
率が異なるトレッドゴムを用いることによって操縦安定
性能、乗心地性能の両立を可能としたラジアルタイヤに
関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention makes it possible to achieve both steering stability and riding comfort by using tread rubbers having different complex elastic moduli in the tire axial direction and the tire radial direction. Regarding radial tires.
〔従来技術〕 ラジアルタイヤ、特に乗用車用のラジアルタイヤにお
いては、安全に旋回できるコーナリング性能などの操縦
安定性能に加えて、路面からの衝撃を緩和し快適な走行
を可能とするための乗心地性能が要求される。[Prior art] Radial tires, especially radial tires for passenger cars, have steering stability performance such as cornering performance that allows safe turning, and ride comfort performance that enables comfortable running by absorbing impact from the road surface. Is required.
しかしながら、操縦安定性能を高めるべく、偏平率を
低減しかつタイヤ全体の剛性を高めるときには、路面か
らの衝撃緩和性能を小とし、乗心地性能が低下するな
ど、操縦安定性能と乗心地性能とは二律背反の性能であ
り、従って従来、これらの妥協点に立ってゴム等の選択
が行われていた。However, when the flatness ratio is reduced and the rigidity of the tire as a whole is increased in order to enhance the steering stability performance, the impact cushioning performance from the road surface is reduced and the riding comfort performance is reduced. It is an antinomy performance, and thus rubber and the like have been conventionally selected from these compromises.
従って、このようなものでは、操縦安定性能、乗心地
性能を両立させて満足しうるタイヤとはないえない。し
かしながら、コーナリング時における操縦安定性能は、
タイヤ軸方向の剛性、即ち横剛性を高めることによっ
て、運転者の操縦官能を向上でき、又乗心地性能は一定
の速度での直進走行中に特にその良否が判断されしかも
乗心地の改善のためには路面の凹凸を通過する際の衝撃
緩和をはかるべくエンペロープ性能を高めればよく、こ
れには縦剛性即ちタイヤ半径方向の剛性を低下させるの
がよいのであり、このような原点に立返えってトレッド
ゴムを再考したとき、このトレッドゴム自体によって、
タイヤ軸方向の剛性を高めると同時にタイヤ半径方向の
剛性を低下した、異方向性のゴムを用いることによっ
て、操縦安定性能と乗心地性能を両立させることに気付
いたのである。Therefore, such a tire cannot satisfy the steering stability performance and the riding comfort performance at the same time. However, the steering stability performance during cornering is
By increasing the rigidity in the tire axial direction, that is, the lateral rigidity, the driver's maneuverability can be improved, and the riding comfort performance is especially judged during straight running at a constant speed, and for improving the riding comfort. In order to reduce the impact when passing through unevenness of the road surface, it is necessary to enhance the performance of the envelope, and it is good to reduce the longitudinal rigidity, that is, the rigidity in the tire radial direction. When rethinking the tread rubber by this tread rubber itself,
By using an anisotropic rubber that has increased rigidity in the axial direction of the tire and decreased rigidity in the radial direction of the tire, I have realized that both steering stability and riding comfort are achieved.
さらに、短繊維を所定方向に配列することによってゴ
ムの剛性をその方向によって異ならせることも見出し
た。Furthermore, it has been found that the rigidity of the rubber can be varied depending on the direction by arranging the short fibers in a predetermined direction.
従って本発明は、タイヤ軸方向の剛性を高めかつタイ
ヤ半径方向の剛性を低下しうる異方向性のトレッドゴム
を用いることによって、操縦安定性能と乗心地性能とを
両立させうるラジアルタイヤの提供を目的としている。Therefore, the present invention provides a radial tire that can achieve both steering stability and riding comfort by using an anisotropic tread rubber that can increase the rigidity in the tire axial direction and reduce the rigidity in the tire radial direction. Has an aim.
本発明は、有機の短繊維をタイヤ軸方向に配向しタイ
ヤ軸方向の複素弾性率Ea＊とタイヤ半径方向の複素弾性
率Eb＊の比Ea＊/Eb＊を1.5よりも大としたトレッドゴム
を用いたトレッド部を有するラジアルタイヤである。The present invention is a tread rubber in which organic short fibers are oriented in the tire axial direction and the ratio Ea * / Eb * of the complex elastic modulus Ea * in the tire axial direction and the complex elastic modulus Eb * in the tire radial direction is greater than 1.5. Is a radial tire having a tread portion using.
これによってタイヤの横剛性を縦剛性よりも大とし、
コーナリング時の横力に対する抵抗性を増し操縦安定性
を向上すると同時に、縦剛性を増大させないことによっ
てエンベロープ特性を維持し、乗心地性能を保つ。This makes the lateral rigidity of the tire greater than the vertical rigidity,
The resistance to lateral force during cornering is increased to improve the steering stability, and at the same time, the vertical rigidity is not increased to maintain the envelope characteristics and maintain the riding comfort performance.
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 with reference to 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両端とを継ぐ
サイドウオール７、７とを有し、カーカス３のタイヤ半
径方向外側にはベルト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 showing a state in which the tire 1 is assembled to a regular rim R and filled with a regular internal pressure, a tire 1 includes a carcass 3, bead portions 5 and 5 having a pair of bead cores 4 and 4 made of metal wires, and a carcass. An annular tread 6 arranged radially outward, and side walls 7, 7 connecting the bead portion 5 and both ends of the tread 6 are provided, and a belt 9 is provided on the outer side of the carcass 3 in the radial direction of the tire. Part 5
A bead apex 10, 10 extending from the bead cores 4, 4 to the outside in the radial direction of the tire is arranged therein.
又本例ではタイヤ１は、最大巾Ｗと、タイヤ断面高さ
Ｈとの比H/Wが0.7以下の偏平タイヤとして形成される。Further, in this example, the tire 1 is formed as a flat tire in which the ratio H / W between the maximum width W and the tire cross-section height H is 0.7 or less.
前記カーカス３は、合成樹脂等の有機繊維コード又は
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１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
とを形成しており、又本体部3Aと巻返し部3Bとの間には
前記ビードエーペックス10が配置される。The carcass 3 is composed of at least one ply cord layer in which organic fiber cords such as synthetic resin or inorganic fiber cords such as metal are arranged in the radial direction, and the carcass 3 passes through the side wall 7 and the tread 6 and a bead portion. By being rewound by the bead core 4 of No. 5, the main body section 3A and the rewinding section 3B
And the bead apex 10 is arranged between the main body 3A and the rewinding 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度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、さらに前記ベルトコード11は、スチール等の
金属材からなる素線12…の撚り合わせ体からなる。Further, the belt 9 in this example has an inner ply 9a located on the carcass 3 side and an outer ply 9b arranged on the outer side of the carcass 3. Each of the plies 9a, 9b is parallel and 10 to 10 in the circumferential direction.
It is formed of a cord layer in which the belt cord 11 is arranged at an angle of 35 degrees. Further, the belt cords 11 of the inner ply 9a and the belt cords 11 of the outer ply 9b are arranged so as to intersect with each other, and the belt cords 11 are formed by twisting strands 12 made of a metal material such as steel.
前記サイドウオール７は、通常の等方向性をゴムを用
いて形成されるとともに、トレッド６は、前記したごと
く、異方向性のトレッドゴムを用いている。The side wall 7 is formed of normal isotropic rubber, and the tread 6 is of the different direction tread rubber as described above.
トレッドゴムは、本例では、ゴム基材11に有機の短繊
維12を配合した強化ゴム材を用いており、又短繊維12は
タイヤ軸方向に配向させ、これによって、タイヤ軸方向
の複素弾性率Ea＊とタイヤ半径方向の複素弾性率Eb＊の
比Ea＊/Eb＊を1.5よりも大とし、これによって、縦剛性
に比して横剛性が大となる。なお複素弾性率は岩本製作
所性粘弾性スペクトロメータを用いて、タイヤのトレッ
ドからタイヤ軸方向、タイヤ半径方向に巾4mm、長さ30m
m、厚さ2mmの試料を切り出し、周波数10Hz、温度70℃、
動歪２％にて測定している。In this example, the tread rubber uses a reinforced rubber material in which a rubber base material 11 is mixed with an organic short fiber 12, and the short fiber 12 is oriented in the tire axial direction, whereby the complex elasticity in the tire axial direction is obtained. rate Ea * and the tire radial direction of the complex elastic modulus Eb * in a ratio Ea * / Eb * large cities than 1.5, thereby, the horizontal stiffness becomes larger than the vertical stiffness. The complex elastic modulus was measured by using a viscoelasticity spectrometer manufactured by Iwamoto Seisakusho Co., Ltd., with a width of 4 mm and a length of 30 m from the tire tread to the tire axial direction and the tire radial direction.
m, thickness 2mm sample is cut out, frequency 10Hz, temperature 70 ℃,
The dynamic strain is measured at 2%.
前記ゴム基材11は、天然ゴム、ポリイソプレンゴム、
スチレンブタジエンゴム、ポリブタジエン系ゴムなどの
少なくとも１種又は複数種類を混合したものであり、又
ゴム基材には、カーボンブラック、シリカなどの強化材
とともに、老化防止材等適宜の添加材が混合される。The rubber substrate 11 is a natural rubber, polyisoprene rubber,
It is a mixture of at least one kind or a plurality of kinds such as styrene-butadiene rubber and polybutadiene-based rubber, and the rubber base material is mixed with a reinforcing material such as carbon black and silica and an appropriate additive such as an antiaging material. It
又前記有機の短繊維12は、ナイロン、レーヨン、ポリ
エステル、芳香族ポリアミド、結晶性ポリフタジエン、
炭素繊維などの有機材料からなる。これらの有機の短繊
維は、通常、20μｍ〜2mm程度の長さ、0.1μｍ〜0.1mm
程度の直径でありかつ前記複素弾性率の比Ea＊/Eb＊が
1.5よりも大であって、しかもタイヤ軸方向の複素弾性
率Ea＊を70〜130kg/cm2程度とし、又タイヤ半径方向の
複素弾性率Eb＊を50〜80kg/cm2の範囲となるように配合
される。The organic short fibers 12 are nylon, rayon, polyester, aromatic polyamide, crystalline polyphthaldiene,
It is made of organic material such as carbon fiber. These organic short fibers usually have a length of about 20 μm to 2 mm and a length of 0.1 μm to 0.1 mm.
And the ratio Ea * / Eb * of the complex elastic modulus is about the diameter.
It is larger than 1.5, and the complex elastic modulus Ea * in the tire axial direction is set to about 70 to 130 kg / cm 2, and the complex elastic modulus Eb * in the tire radial direction is set to be in the range of 50 to 80 kg / cm 2. Is blended with.
複素弾性率Ea＊、Eb＊をこのような比とすることによ
ってタイヤの横剛性を縦剛性よりも大とし、コーナリン
グ時の横力に対する抵抗性を増し操縦安定性を向上する
と同時に、縦剛性を増大させないことによってエンベロ
ープ特性を維持し、乗心地低能を保つのであって特に本
例のごとく、偏平率が0.7以下のタイヤにおいて、優れ
た効果を奏しうる。By setting the complex elastic moduli Ea * and Eb * to such a ratio, the lateral rigidity of the tire is made larger than the longitudinal rigidity, and the resistance to lateral force during cornering is increased to improve the steering stability and at the same time, the longitudinal rigidity is improved. By not increasing it, the envelope characteristics are maintained and the riding comfort is kept low, and particularly in the tire having an aspect ratio of 0.7 or less as in this example, an excellent effect can be obtained.
又前記比Ea＊/Eb＊が1.5よりも小であるとき、このよ
うな改善効果は低下する。さらにタイヤ軸方向の複素弾
性率Ea＊を70kg/cm2以上とすることにより、従来タイヤ
よりもコーナリングを向上し、又タイヤ半径方向の複素
弾性率Eb＊を60kg/cm2以下とすることにより乗心地が改
善される。Further, when the ratio Ea * / Eb * is smaller than 1.5, such an improving effect decreases. Further, by setting the complex elastic modulus Ea * in the tire axial direction to 70 kg / cm 2 or more, cornering is improved as compared with the conventional tire, and the complex elastic modulus Eb * in the tire radial direction is set to 60 kg / cm 2 or less. The riding comfort is improved.
なお前記結晶性ポリブタジエンとして例えば商品名VC
R（宇部興産株式会社製）等がある。As the crystalline polybutadiene, for example, trade name VC
R (manufactured by Ube Industries, Ltd.) etc.
さらにトレッドゴムは、例えば第２図に示すように、
カレンダーロールによる成型、又は押出しによって短繊
維12の配向を押出し方向に列理させてゴム基材11に埋設
したシート体15を、その長手方向と直角に切断したシー
ト片16として形成でき、このシート片16をタイヤ円周方
向に添設することによって、短繊維12がタイヤ軸方向に
配向したトレッド６を形成しうる。Further, the tread rubber is, for example, as shown in FIG.
A sheet body 15 embedded in the rubber base material 11 by forming the orientation of the short fibers 12 in the extrusion direction by molding with a calendar roll or by extrusion can be formed as a sheet piece 16 cut at a right angle to its longitudinal direction. By providing the pieces 16 along the tire circumferential direction, the short fibers 12 can form the tread 6 oriented in the tire axial direction.
タイヤサイズ185/60R14のスチールラジアルタイヤ
を、第１表に示す仕様により製作した。又同様に第１表
に示す比較例品を製造し、ともに乗用車に装着し運転者
による官能試験を行い、５段階評価を行った。比較例等
を基準３とし、点数が高いほうが良好であることを示し
ている。こ の結果、実施例１の結晶性ポリブタジエン（VCR）を混
合したタイヤは特に乗心地性に優れており、又短繊維と
してナイロン埋込み天然ゴム（商品名FRR宇部興産株式
会社製）を用いた実施例２のものは操縦安定性に優れ、
ともに操縦安定性能と、乗心地性能とを両立させている
ことがわかる。Steel radial tires with a tire size of 185 / 60R14 were manufactured according to the specifications shown in Table 1. Similarly, the comparative products shown in Table 1 were manufactured, both were mounted on a passenger car, and a sensory test was conducted by a driver to carry out a five-level evaluation. It is shown that the higher the score, the better, with the comparative example and the like as the reference 3. This As a result, the tire in which the crystalline polybutadiene (VCR) of Example 1 was mixed was particularly excellent in ride comfort, and an example in which nylon-embedded natural rubber (trade name FRR made by Ube Industries, Ltd.) was used as the short fiber 2 has excellent steering stability,
It can be seen that both the steering stability performance and the riding comfort performance are both achieved.
なお第１表に配合数値はいずれも重量部で示し、又実
施例１のVCRは、前記したごとく、宇部興産製の結晶性
ポリブタジエン、又実施例２のFRは、同社製のナイロン
短繊維複合材であって、ナイロン短繊維と天然ゴムと
を、予め1:2の割合で混合している。In Table 1, all the blending values are shown in parts by weight, VCR of Example 1 is crystalline polybutadiene manufactured by Ube Industries, and FR of Example 2 is nylon short fiber composite manufactured by the same company as described above. As the material, nylon short fibers and natural rubber are mixed in advance in a ratio of 1: 2.
このように本発明のラジアルタイヤは、タイヤ軸方向
の複素弾性率をタイヤ半径方向の複素弾性率に比べて1.
5よりも大としているため、タイヤ半径方向の剛性を高
めることなくタイヤ軸方向の剛性を大としており、従っ
て二律背反の特性といわれる操縦安定性能と乗心地性能
とを両立させつつともに向上することが可能となる。As described above, the radial tire of the present invention has a complex elastic modulus in the tire axial direction as compared with the complex elastic modulus in the tire radial direction.
Since it is larger than 5, the rigidity in the tire axial direction is made large without increasing the rigidity in the tire radial direction, and therefore it is possible to improve both the steering stability performance and the riding comfort performance, which are said to be characteristics of antinomy. It will be possible.
第１図は本発明の一実施例を示す断面図、第２図はトレ
ッドゴムの製造方法を略示する傾斜図である。 ６……トレッド、11……ゴム基材、12……短繊維。FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an inclined view schematically showing a method for producing a tread rubber. 6 ... Tread, 11 ... Rubber base material, 12 ... Short fiber.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭47−28040（ＪＰ，Ａ) 特開 昭54−132905（ＪＰ，Ａ) 特開 昭47−7401（ＪＰ，Ａ) 特開 昭61−119409（ＪＰ，Ａ) 特開 昭57−151405（ＪＰ，Ａ) 特開 昭58−30806（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-47-28040 (JP, A) JP-A-54-132905 (JP, A) JP-A-47-7401 (JP, A) JP-A-61- 119409 (JP, A) JP-A-57-151405 (JP, A) JP-A-58-30806 (JP, A)
Claims (2)
ヤ軸方向の複素弾性率Ea＊とタイヤ半径方向の複素弾性
率Eb＊の比Ea＊/Eb＊を1.5よりも大としたトレッドゴム
を用いたトレッド部を有するラジアルタイヤ。1. A tread in which organic short fibers are oriented in the tire axial direction and the ratio Ea * / Eb * of the complex elastic modulus Ea * in the tire axial direction to the complex elastic modulus Eb * in the tire radial direction is set to be larger than 1.5. A radial tire having a tread portion made of rubber.
らなることを特徴とする特許請求の範囲第１項記載のラ
ジアルタイヤ。2. The radial tire according to claim 1, wherein the organic short fibers are made of crystalline polybutadiene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62304077A JP2565953B2 (en) | 1987-11-30 | 1987-11-30 | Radial tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62304077A JP2565953B2 (en) | 1987-11-30 | 1987-11-30 | Radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01145205A JPH01145205A (en) | 1989-06-07 |
| JP2565953B2 true JP2565953B2 (en) | 1996-12-18 |
Family
ID=17928752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62304077A Expired - Fee Related JP2565953B2 (en) | 1987-11-30 | 1987-11-30 | Radial tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2565953B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2788398B2 (en) | 1992-10-08 | 1998-08-20 | 住友ゴム工業株式会社 | tire |
| US20100236695A1 (en) * | 2009-03-20 | 2010-09-23 | E.I. Du Pont De Nemours And Company | Tire tread block composition |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2111349C (en) * | 1992-12-14 | 2003-05-06 | Yuichi Saito | Radial tires |
| JP2813307B2 (en) * | 1994-12-28 | 1998-10-22 | 住友ゴム工業株式会社 | Tread rubber composition for tire |
| JP2006213193A (en) | 2005-02-04 | 2006-08-17 | Sumitomo Rubber Ind Ltd | Pneumatic radial-ply tire |
| JP5138913B2 (en) * | 2006-09-15 | 2013-02-06 | 東洋ゴム工業株式会社 | Pneumatic tire |
| JP4897466B2 (en) * | 2006-12-19 | 2012-03-14 | 東洋ゴム工業株式会社 | Pneumatic tire |
| US20110259492A1 (en) * | 2010-04-26 | 2011-10-27 | Richard Mbewo Samwayeba Fosam | Pneumatic tire with anisotropic tread |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54132905A (en) * | 1978-04-06 | 1979-10-16 | Bridgestone Corp | Pneumatic tire with improved anti-chipping property |
| JPH062441B2 (en) * | 1984-11-15 | 1994-01-12 | 株式会社ブリヂストン | Pneumatic tire |
-
1987
- 1987-11-30 JP JP62304077A patent/JP2565953B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2788398B2 (en) | 1992-10-08 | 1998-08-20 | 住友ゴム工業株式会社 | tire |
| US20100236695A1 (en) * | 2009-03-20 | 2010-09-23 | E.I. Du Pont De Nemours And Company | Tire tread block composition |
| CN102361762A (en) * | 2009-03-20 | 2012-02-22 | 纳幕尔杜邦公司 | Tire tread block composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01145205A (en) | 1989-06-07 |
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Legal Events
| Date | Code | Title | Description |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| LAPS | Cancellation because of no payment of annual fees |