JPH04154405A - Pneumatic radial tire - Google Patents

Pneumatic radial tire

Info

Publication number
JPH04154405A
JPH04154405A JP2278534A JP27853490A JPH04154405A JP H04154405 A JPH04154405 A JP H04154405A JP 2278534 A JP2278534 A JP 2278534A JP 27853490 A JP27853490 A JP 27853490A JP H04154405 A JPH04154405 A JP H04154405A
Authority
JP
Japan
Prior art keywords
breaker
tread
tire
cord
breakers
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
Application number
JP2278534A
Other languages
Japanese (ja)
Inventor
Kenji Yoshida
憲治 吉田
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.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries 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 Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Priority to JP2278534A priority Critical patent/JPH04154405A/en
Publication of JPH04154405A publication Critical patent/JPH04154405A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To enhance riding feeling by setting a gage between breakers at a specific ratio of a breaker cord diameter so as to reduce rolling resistance, and reducing hardness of tread robber into a specific range. CONSTITUTION:In a pneumatic tire 1, band-like breakers 7 are arranged in an annular tread 2 outside in the radial direction of a carcass 6, and the breaker 7 is formed of multiple breaker cords 70 embedded in topping rubber 71 at specified intervals. In this case, in relationship between a cord diameter (d) of the breaker cord 70 and a distance between adjoining breaker cords 70, 70 (namely, a breaker cord 70 in the outside layer 7A and a breaker cord 70 in the inside layer 7B) being a gage H between the breakers, the gage H between the breakers is set within the range of 40% or more and less than 80%, of the breaker cord diameter (d). Also tread rubber hardness Hs of the tread 2 is decreased to 56-62, thereby improving longitudinal rigidity of the tire so as to enhance riding feeling.

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に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a pneumatic radial tire.

〔従来技術〕[Prior art]

近来、空気入りタイヤにおいては、車両性能が向上する
にともない、車両の有する性能を十分に発揮させるため
に、転がり抵抗の少ないタイヤが要求される傾向にある
BACKGROUND ART In recent years, as vehicle performance has improved, there has been a trend in pneumatic tires to require tires with low rolling resistance in order to fully demonstrate the performance of the vehicle.

その一方で、車両の居住性を向上させるため、乗り心地
性能を一層向上させることが要求されている。
On the other hand, in order to improve the comfort of vehicles, it is required to further improve ride comfort performance.

ここで、タイヤの転がり抵抗を低減させるためには、タ
イヤの剛性を高め、撓みを少なくする手段を採用する、
或いはタイヤの軽量化を図る等の方法がある。
In order to reduce the rolling resistance of tires, measures are taken to increase tire rigidity and reduce deflection.
Alternatively, there is a method of reducing the weight of the tire.

タイヤの軽量化を図るとともに、剛性を高め、撓みを少
なくする手段として従来から知られている方法としては
、トレッド部に配設されたコードのタイヤ半径方向のコ
ード間の距離であるトレッドゲージを減少させ、コード
のタイヤ半径方向密度を大きくする、或いはトレッドゴ
ムの損失正接(tanδ)を減少させる等をすることに
より、トレッド部の剛性を高める方法がある。
A conventionally known method for reducing tire weight, increasing rigidity, and reducing deflection is to measure the tread gauge, which is the distance between the cords arranged in the tread, in the radial direction of the tire. There are ways to increase the rigidity of the tread portion by increasing the density of the cord in the tire radial direction, or decreasing the loss tangent (tan δ) of the tread rubber.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら、乗り心地性能に主として影響を与える要
因は、タイヤ全体の縦剛性であり、この縦剛性が増加す
ると乗り心地性能が悪化する。
However, the factor that mainly affects the ride comfort performance is the longitudinal stiffness of the entire tire, and as this longitudinal stiffness increases, the ride comfort performance deteriorates.

この結果、トレッドの剛性を増加させることにより、タ
イヤの転がり抵抗を低減させようとすると、タイヤ全体
の縦剛性が大きくなり、乗り心地が悪化する。
As a result, if an attempt is made to reduce the rolling resistance of the tire by increasing the rigidity of the tread, the longitudinal rigidity of the entire tire increases, resulting in poor ride comfort.

また、トレッドの剛性をたかめると、ロードノイズの増
大、耐久性の低下、ウェット性能の低下等を招来すると
いう問題があった。
Furthermore, increasing the rigidity of the tread causes problems such as an increase in road noise, a decrease in durability, and a decrease in wet performance.

本発明の目的は、タイヤの軽量化を図るとともに、転が
り抵抗を低減させ、乗り心地を向上させることのできる
空気入りタイヤを提供することである。
An object of the present invention is to provide a pneumatic tire that can reduce the weight of the tire, reduce rolling resistance, and improve riding comfort.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために本発明の空気入りタイヤは、
環状に形成され、内部に帯状のブレーカが配設された環
状トレッドと、環状トレッドの両端から半径方向内側に
延設された一対のサイドウオールと、サイドウオールの
内端部に設けられ、ビードコアを有するビード部とから
成る空気入りラジアルタイヤにおいて、ブレーカを構成
するブレーカコードのタイヤ半径方向の間隙であるフレ
ーカ間ゲージHをブレーカコード径dの40%以上80
%未満の範囲としく0.4d≦H<0.8d)、且つト
レッドゴムの硬度Hsを56〜62とするものである。
In order to achieve the above object, the pneumatic tire of the present invention has the following features:
An annular tread formed in an annular shape with a band-shaped breaker disposed inside, a pair of side walls extending radially inward from both ends of the annular tread, and a bead core provided at the inner end of the side wall. In a pneumatic radial tire consisting of a bead portion having a breaker cord, the inter-flaker gauge H, which is the gap in the tire radial direction between the breaker cords constituting the breaker, is 80% or more of the breaker cord diameter d.
% (0.4d≦H<0.8d), and the hardness Hs of the tread rubber is 56 to 62.

〔作用〕[Effect]

上記のとおり構成された本発明の空気入りラジアルタイ
ヤにおいては、ブレーカコードのブレーカ間ゲージHを
ブレーカコード径dの40%以上80%未満の範囲とし
たことにより、通常用いられているタイヤにおいてはH
/d=0.8〜0.9であるから、間隙が狭まることに
なって、ブレーカコード間に充填されたトッピングゴム
の量を減少させることができるから、トレッド部の変形
によるエネルギーロスを減少させることができ、転がり
抵抗を低減させることができる。
In the pneumatic radial tire of the present invention configured as described above, the gauge H between the breakers of the breaker cord is set in the range of 40% or more and less than 80% of the breaker cord diameter d, so that it is different from that in normally used tires. H
Since /d=0.8 to 0.9, the gap narrows and the amount of topping rubber filled between the breaker cords can be reduced, reducing energy loss due to deformation of the tread part. It is possible to reduce rolling resistance.

ここで、ブレーカ間ゲージHが0.4d未満(H<0.
4d)の場合には耐久性が低下し、ブレーカ間ゲージH
が0.8d以上(H≧0.8d)の場合にはブレーカコ
ードのタイヤ半径方向密度が低くなり、ブレーカ剛性が
低下して操縦安定性能が悪化する。
Here, the inter-breaker gauge H is less than 0.4d (H<0.
In the case of 4d), the durability decreases and the breaker gauge H
When H is 0.8d or more (H≧0.8d), the density of the breaker cord in the tire radial direction becomes low, the breaker rigidity decreases, and the steering stability deteriorates.

また、トレッドゴムの硬度H3を56〜62に低減させ
ることにより、乗り心地を向上させる。
Furthermore, by reducing the hardness H3 of the tread rubber to 56 to 62, ride comfort is improved.

〔実施例〕〔Example〕

本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described based on the drawings.

第1図において、空気入りタイヤ1は、環状に形成され
た環状トレッド2と、環状トレッド2の両端から半径方
向内側に延設された一対のサイドウオール3,3と、サ
イドウオール3.3の内端部に設けられ、それぞれビー
ドコア4.4を有するビード部5.5とから成っている
In FIG. 1, a pneumatic tire 1 includes an annular tread 2 formed in an annular shape, a pair of sidewalls 3, 3 extending radially inward from both ends of the annular tread 2, and a sidewall 3.3. It consists of bead portions 5.5 located at the inner end and each having a bead core 4.4.

空気入りタイヤlの内部に、環状トレンド2とサイドウ
オール3,3を通り、両端がそれぞれビードコア4.4
の周りに内側から外側へ巻き上げられて係止される1ブ
ライまたは複数プライのカーカス6が設けられ、カーカ
ス6の半径方向外側の環状トレッド2に、帯状のブレー
カ7が配置されており、ビードコア4.4の半径方向外
側にビードフィラーゴム8,8が配設されている。
Inside the pneumatic tire l, passing through the annular trend 2 and sidewalls 3, 3, each end has a bead core 4.4.
A one- or multiple-ply carcass 6 is provided that is rolled up and locked from the inside to the outside around the carcass 6, and a band-shaped breaker 7 is arranged on the annular tread 2 on the radially outer side of the carcass 6. Bead filler rubber 8, 8 is arranged on the radially outer side of .4.

第2図において、ブレーカ7は、外側層7^と内側層7
Bとからなり、タイヤ円周方向に対して所定の角度と、
所定の間隙をもって多数のブレーカコード70がトッピ
ングゴム70内に埋設されて構成されている。
In FIG. 2, the breaker 7 has an outer layer 7^ and an inner layer 7.
B, a predetermined angle with respect to the tire circumferential direction, and
A large number of breaker cords 70 are embedded in the topping rubber 70 with predetermined gaps.

ブレーカコード70のコード径dと、タイヤ半径方向の
隣合ったブレーカコード70.70 (即ち外側層7A
のブレーカコード70と内側層7Bのブレーカコード7
G)間の距離をブレーカ間ゲージHとにおいて、ブレー
カ間ゲージHをブレーカコードldの40%以上80%
未満の範囲とした(0.4d≦H<0.8d)ものであ
る。
The cord diameter d of the breaker cord 70 and the adjacent breaker cord 70.70 in the tire radial direction (i.e., the outer layer 7A
The breaker code 70 of the inner layer 7B and the breaker code 7 of the inner layer 7B
G) The distance between the breakers is the gauge H between the breakers, and the gauge H between the breakers is 40% or more and 80% of the breaker cord ld.
(0.4d≦H<0.8d).

ここで、ブレーカ間ゲージHが0.4 d未満(H<0
.4d)の場合にはトッピングゴムが薄くなり過ぎて耐
久性が低下しく第3図に示す実験結果弁N)、一方プレ
ーカ間ゲージHが0.8d以上(H≧0.8d)の場合
にはブレーカコードのタイヤ半径方向密度が低くなり、
ブレーカ剛性が低下して操縦安定性能が悪化する。
Here, the inter-breaker gauge H is less than 0.4 d (H<0
.. In the case of 4d), the topping rubber becomes too thin and the durability decreases, and the experimental results shown in Fig. 3 are N).On the other hand, when the gauge H between the players is 0.8d or more (H≧0.8d), the topping rubber becomes too thin and the durability decreases. The density of the breaker cord in the tire radial direction is lower,
Breaker rigidity decreases and steering stability deteriorates.

なお、第3図に結果を示す実験は、タイヤサイズ165
SR13SP7のタイヤを使用し、ブレーカ間ゲージH
とコード径dの比H/dを変化させて、ブレーカ端にお
けるゴムとコードとの接着破壊を起因とする剥離、所謂
プレーカエンジルースネス(BEL)発生程度を測定し
、耐久性を試験したもので、H/dが0.31.0.4
.0.6のタイヤについて実験したものである。
The experiment whose results are shown in Figure 3 was conducted using tire size 165.
Using SR13SP7 tires, breaker gauge H
The durability was tested by varying the ratio H/d of the cord diameter and d to measure the degree of peeling caused by breakage of adhesion between the rubber and the cord at the breaker end, so-called breakage looseness (BEL). and H/d is 0.31.0.4
.. This experiment was conducted using a 0.6 tire.

この構成により、ブレーカコード間に充填されたトッピ
ングゴムの量を減少させることができる(通常のタイヤ
においては、H−(0,8〜0.9) dである)から
、トレッド部の変形によるエネルギーロスを減少させる
ことができ、転がり抵抗を低減させることができるとと
もに、操縦安定性能における応答性が向上する。
With this configuration, the amount of topping rubber filled between the breaker cords can be reduced (in normal tires, it is H-(0.8 to 0.9) d), so the amount of topping rubber filled between the breaker cords can be reduced. Energy loss can be reduced, rolling resistance can be reduced, and responsiveness in handling stability performance is improved.

また、トレッド2のトレッドゴム硬度Isを56〜62
に低下させることにより、タイヤの縦剛性を改善して乗
り心地を向上させる。
In addition, the tread rubber hardness Is of tread 2 is 56 to 62.
This improves the longitudinal stiffness of the tire and improves ride comfort.

次に、タイヤサイズを1655R133P7とし、ブレ
ーカ間ゲージHとコード径dの比H/d並びにトレッド
ゴム硬度Hsを変化させたスチールラジアルタイヤにつ
いて実験した結果を第1表に示す。
Next, Table 1 shows the results of experiments conducted on steel radial tires with a tire size of 1655R133P7 and with varying ratios H/d between breaker gauge H and cord diameter d and tread rubber hardness Hs.

ここで、実施例1.2は本発明を適用したスチールラジ
アルタイヤであり、比較例AはH/dが本発明の範囲内
で、トレッドゴム硬度Hsが本発明の範囲外にあるスチ
ールラジアルタイヤであり、比較例Bは現在通常に用い
られているスチールラジアルタイヤで、各種評価の基準
タイヤとした。
Here, Example 1.2 is a steel radial tire to which the present invention is applied, and Comparative Example A is a steel radial tire in which H/d is within the range of the present invention and tread rubber hardness Hs is outside the range of the present invention. Comparative Example B is a steel radial tire that is currently commonly used, and was used as a reference tire for various evaluations.

第1表 なお、乗り心地並びに操縦安定性の評価においては、評
点3が基準値であり、評点3未満は性能悪化、評点3以
上は性能向上の評価である。
Table 1 Note that in the evaluation of ride comfort and handling stability, a score of 3 is the reference value, a score of less than 3 is an evaluation of performance deterioration, and a score of 3 or more is an evaluation of performance improvement.

第1表の結果から明らかなとおり、ブレーカ間ゲージH
をブレーカコード径dの40%以上80%未満の範囲と
しく0.4d≦H<0.8d)、且つトレッドゴムの硬
度Hsを56〜62とすることにより、転がり抵抗を減
少させることができるとともに、十分な乗り心地性能並
びに操縦安定性を確保することができるものである。
As is clear from the results in Table 1, the breaker gauge H
The rolling resistance can be reduced by setting the breaker cord diameter d to a range of 40% or more and less than 80% (0.4d≦H<0.8d), and by setting the hardness Hs of the tread rubber to 56 to 62. At the same time, sufficient ride comfort performance and handling stability can be ensured.

〔発明の効果〕〔Effect of the invention〕

本発明は上述のとおり構成されているから、以下に述べ
る効果を奏する。
Since the present invention is configured as described above, it produces the effects described below.

ブレーカ間ゲージHをブレーカコード径dの40%以上
80%未満の範囲とした(0.4d≦H<0.8d)こ
とにより、ブレーカコード間に充填されたトッピングゴ
ムの量を減少させ、ブレーカ剛性を増すことができるか
ら、トレッド部の変形によるエネルギーロスを減少させ
ることができ、転がり抵抗を低減させることができる。
By setting the inter-breaker gauge H to a range of 40% or more and less than 80% of the breaker cord diameter d (0.4d≦H<0.8d), the amount of topping rubber filled between the breaker cords is reduced, and the breaker Since the rigidity can be increased, energy loss due to deformation of the tread portion can be reduced, and rolling resistance can be reduced.

また、トレッドゴムの硬度Hsを56〜62に低減させ
ることにより、乗り心地を向上させる。
Furthermore, by reducing the hardness Hs of the tread rubber to 56 to 62, ride comfort is improved.

【図面の簡単な説明】 第1図は本発明を適用する空気入りタイヤの断面図、第
2図はブレーカの拡大断面図、第3図は耐久性の実験結
果を示すグラフである。 1・・・空気入りタイヤ、 2・・・環状トレッド、 3・・・サイドウオール、 5・・・ビード部、 7・・・ブレーカ、 70・・・ブレーカコード、 71・・・トッピングゴム。 特許出願人 住友ゴム工業株式会社
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a pneumatic tire to which the present invention is applied, FIG. 2 is an enlarged sectional view of a breaker, and FIG. 3 is a graph showing experimental results of durability. DESCRIPTION OF SYMBOLS 1... Pneumatic tire, 2... Annular tread, 3... Side wall, 5... Bead part, 7... Breaker, 70... Breaker cord, 71... Topping rubber. Patent applicant: Sumitomo Rubber Industries, Ltd.

Claims (1)

【特許請求の範囲】[Claims] (1)ブレーカを有する環状トレッドと、環状トレッド
の両端から半径方向内側に延設された一対のサイドウォ
ールと、サイドウォールの内端部に設けられ、ビードコ
アを有するビード部とから成る空気入りラジアルタイヤ
において、ブレーカコードのブレーカ間ゲージHをブレ
ーカコード径dに対して0.4d≦H<0.8dとし、
且つトレッドゴムの硬度Hsを56〜62とすることを
特徴とする空気入りラジアルタイヤ。
(1) A pneumatic radial consisting of an annular tread having a breaker, a pair of sidewalls extending radially inward from both ends of the annular tread, and a bead portion provided at the inner end of the sidewall and having a bead core. In the tire, the inter-breaker gauge H of the breaker cord is set to 0.4d≦H<0.8d with respect to the breaker cord diameter d,
A pneumatic radial tire characterized in that the hardness Hs of the tread rubber is 56 to 62.
JP2278534A 1990-10-17 1990-10-17 Pneumatic radial tire Pending JPH04154405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2278534A JPH04154405A (en) 1990-10-17 1990-10-17 Pneumatic radial tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2278534A JPH04154405A (en) 1990-10-17 1990-10-17 Pneumatic radial tire

Publications (1)

Publication Number Publication Date
JPH04154405A true JPH04154405A (en) 1992-05-27

Family

ID=17598609

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2278534A Pending JPH04154405A (en) 1990-10-17 1990-10-17 Pneumatic radial tire

Country Status (1)

Country Link
JP (1) JPH04154405A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012501275A (en) * 2008-09-02 2012-01-19 ソシエテ ド テクノロジー ミシュラン Heavy vehicle tire with crown reinforcement with composite strip
FR3008998A1 (en) * 2013-07-29 2015-01-30 Michelin & Cie LOW THICKNESS AND PNEUMATIC REINFORCED PRODUCT INCLUDING THIS PRODUCT
FR3008997A1 (en) * 2013-07-29 2015-01-30 Michelin & Cie LOW THICKNESS AND PNEUMATIC REINFORCED PRODUCT INCLUDING THIS PRODUCT
FR3008996A1 (en) * 2013-07-29 2015-01-30 Michelin & Cie LOW THICKNESS AND PNEUMATIC REINFORCED PRODUCT INCLUDING THIS PRODUCT
JPWO2016190152A1 (en) * 2015-05-25 2018-03-15 株式会社ブリヂストン Reinforcing member for tire and tire using the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198101A (en) * 1981-04-16 1982-12-04 Pirelli Tire for wheel
JPS5963204A (en) * 1982-10-04 1984-04-10 Sumitomo Rubber Ind Ltd Pneumatic radial tire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198101A (en) * 1981-04-16 1982-12-04 Pirelli Tire for wheel
JPS5963204A (en) * 1982-10-04 1984-04-10 Sumitomo Rubber Ind Ltd Pneumatic radial tire

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012501275A (en) * 2008-09-02 2012-01-19 ソシエテ ド テクノロジー ミシュラン Heavy vehicle tire with crown reinforcement with composite strip
WO2015014776A1 (en) * 2013-07-29 2015-02-05 Compagnie Generale Des Etablissements Michelin Thin reinforced product and tyre comprising said product
CN105452016A (en) * 2013-07-29 2016-03-30 米其林集团总公司 Thin reinforced product and tyre comprising said product
FR3008996A1 (en) * 2013-07-29 2015-01-30 Michelin & Cie LOW THICKNESS AND PNEUMATIC REINFORCED PRODUCT INCLUDING THIS PRODUCT
WO2015014778A1 (en) * 2013-07-29 2015-02-05 Compagnie Generale Des Etablissements Michelin Thin reinforced product and tyre comprising said product
WO2015014777A1 (en) * 2013-07-29 2015-02-05 Compagnie Generale Des Etablissements Michelin Thin reinforced product and tyre comprising said product
FR3008998A1 (en) * 2013-07-29 2015-01-30 Michelin & Cie LOW THICKNESS AND PNEUMATIC REINFORCED PRODUCT INCLUDING THIS PRODUCT
CN105408128A (en) * 2013-07-29 2016-03-16 米其林集团总公司 Thin reinforced product and tre comprising said product
FR3008997A1 (en) * 2013-07-29 2015-01-30 Michelin & Cie LOW THICKNESS AND PNEUMATIC REINFORCED PRODUCT INCLUDING THIS PRODUCT
JP2016525485A (en) * 2013-07-29 2016-08-25 カンパニー ジェネラレ デ エスタブリシュメンツ ミシュラン Thin reinforcing product and tire having such reinforcing product
US10427462B2 (en) 2013-07-29 2019-10-01 Compagnie Generale Des Etablissements Michelin Thin reinforced product and tire comprising said product
US10315465B2 (en) 2013-07-29 2019-06-11 Compagnie Generale Des Etablissements Michelin Thin reinforced product and tire comprising said product
US10391817B2 (en) 2013-07-29 2019-08-27 Compagnie Generale Des Etablissements Michelin Thin reinforced product and tire comprising said product
JPWO2016190152A1 (en) * 2015-05-25 2018-03-15 株式会社ブリヂストン Reinforcing member for tire and tire using the same
EP3305550B1 (en) * 2015-05-25 2020-06-17 Bridgestone Corporation Reinforcement member for tires, and tire using same

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