JPH08156526A - Pneumatic radial tire - Google Patents
Pneumatic radial tireInfo
- Publication number
- JPH08156526A JPH08156526A JP6330235A JP33023594A JPH08156526A JP H08156526 A JPH08156526 A JP H08156526A JP 6330235 A JP6330235 A JP 6330235A JP 33023594 A JP33023594 A JP 33023594A JP H08156526 A JPH08156526 A JP H08156526A
- Authority
- JP
- Japan
- Prior art keywords
- tread
- tire
- belt
- carcass
- 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.)
- Granted
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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
- B60C11/1346—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls covered by a rubber different from the tread rubber
-
- 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
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、低騒音化を促進しうる
空気入りラジアルタイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic radial tire capable of promoting noise reduction.
【0002】[0002]
【従来の技術】近年、車両の静粛性の向上に伴い、タイ
ヤが発生する騒音の車両全体への寄与率が大となり、そ
の低減が要求され、特に160Hz、250Hzの低い
周波領域と800Hz以上の高周波領域との両域におけ
る騒音の低減が望まれる。高い周波数領域の主要な音源
として気柱共鳴によるポンピングノイズがある。さらに
低い周波領域で生じる音源には、走行時においてトレッ
ド部の弾性変化によって生じるタイヤ自体の振動による
騒音がある。2. Description of the Related Art In recent years, the contribution of noise generated by tires to the entire vehicle has increased with the improvement of the quietness of the vehicle, and it has been required to reduce it. In particular, the low frequency range of 160 Hz, 250 Hz and 800 Hz or more are required. It is desired to reduce noise in both high frequency region and high frequency region. Pumping noise due to air column resonance is a main sound source in the high frequency region. The sound source generated in the lower frequency region includes noise due to vibration of the tire itself caused by elasticity change of the tread portion during traveling.
【0003】タイヤトレッドには、ウエットグリップを
維持するため一般にタイヤ周方向に連続する複数の周方
向溝が配置される。このようなタイヤは、接地面におい
て、地面との周方向溝とで一種の気柱を形成し、転動中
のタイヤトレッドの変形により、この気柱中に空気が流
動し、それによって、特定波長の音が発生する。この現
象は、気柱共鳴と呼ばれ縦溝を有するタイヤの騒音の主
たる音源となる。例えば、周方向溝の、接地長が20cm
であるとき、約900Hzの音が発生する。この音はタ
イヤの速度によらずほぼ一定周波数の音となり、車内音
及び車外音を増加させる。In order to maintain a wet grip, the tire tread is generally provided with a plurality of circumferential grooves which are continuous in the tire circumferential direction. Such a tire forms a kind of air column with the circumferential groove with the ground at the ground contact surface, and the deformation of the tire tread during rolling causes air to flow into the air column, thereby identifying the air column. Sound of wavelength is generated. This phenomenon is called air column resonance and is the main source of noise in tires having vertical grooves. For example, the contact length of the circumferential groove is 20 cm
, A sound of about 900 Hz is generated. This sound becomes a sound having a substantially constant frequency regardless of the speed of the tire, and increases the sound inside the vehicle and the sound outside the vehicle.
【0004】他方、トレッドゴムがブロック化されてい
る場合で、その剛性変化によって走行時にトレッド部と
サイドウォール部とが加振され、その振動が空気ノイズ
となる。On the other hand, in the case where the tread rubber is blocked, the tread portion and the sidewall portion are vibrated during traveling due to the change in rigidity, and the vibrations cause air noise.
【0005】[0005]
【発明が解決しようとする課題】この気柱共鳴を防止す
る手段として、前記周方向溝の接地長の0.3〜0.4
倍に相当する円周ピッチで周方向溝に遮蔽物を設け、気
柱共鳴を防止する技術が提案されているが、このような
周方向溝内の遮蔽物は気柱共鳴を防止させるとはいえ、
水流を妨げ周方向溝本来の目的であるウエットグリップ
性能を低下させるという問題がある。As means for preventing this air column resonance, the ground contact length of the circumferential groove is 0.3 to 0.4.
A technique has been proposed for preventing air column resonance by providing a shield in the circumferential groove at a circumferential pitch equivalent to twice, but it is said that the shield in such a circumferential groove prevents air column resonance. House,
There is a problem of impeding the water flow and deteriorating the wet grip performance which is the original purpose of the circumferential groove.
【0006】又、タイヤ自体の振動を抑制する手段とし
て、トレッド部、サイドウォール部の断面厚さを厚くす
る、又はトレッドゴム、サイドウォール部のゴム硬度を
高くする等の方法が考えられるが、このようなタイヤ基
体の剛性増大は、乗心地、走行性能の低下を招くことと
なる。As means for suppressing the vibration of the tire itself, a method of increasing the sectional thickness of the tread portion or the sidewall portion, or increasing the rubber hardness of the tread rubber or the sidewall portion can be considered. Such an increase in the rigidity of the tire base body causes a decrease in riding comfort and running performance.
【0007】本発明は、走行性能及びウエットグリップ
性能を維持しつつ、低周波域及び高周波域において全般
的に騒音の音圧を下げ、タイヤ騒音を低減しうる空気入
りラジアルタイヤの提供を目的とする。An object of the present invention is to provide a pneumatic radial tire capable of reducing tire sound pressure and lowering tire noise generally in a low frequency region and a high frequency region while maintaining running performance and wet grip performance. To do.
【0008】[0008]
【課題を解決するための手段】本発明は、トレッド部か
らサイドウォール部を通りビード部のビードコアの周り
を折返すとともにラジアル配列のカーカスコードからな
るカーカスと、トレッド部の内部かつカーカスの半径方
向外側に配されるベルト層と、前記ベルト層の半径方向
外側に配されトレッド面をなすトレッドゴム層とを具
え、しかも前記トレッド面に周方向にのびる複数の周方
向溝を設けた空気入りラジアルタイヤであって、前記ベ
ルト層は全芳香族ポリエステル繊維からなるベルトコー
ドを用いたベルトプライによって形成されるとともに、
トレッドゴム層は、前記各周方向溝のタイヤ半径方向内
方かつ該周方向溝の溝底面にのみ露出するとともに発泡
倍率が20%以上かつ100%以下の発泡ゴムが設けら
れたことを特徴とする空気入りラジアルタイヤである。SUMMARY OF THE INVENTION The present invention is directed to a carcass formed of a carcass cord having a radial arrangement and folding back around a bead core of a bead part through a tread part, a sidewall part, and a carcass inside the tread part and in a radial direction of the carcass. A pneumatic radial provided with a belt layer arranged on the outer side and a tread rubber layer arranged on the outer side in the radial direction of the belt layer and forming a tread surface, and further having a plurality of circumferential grooves extending in the circumferential direction on the tread surface. A tire, wherein the belt layer is formed by a belt ply using a belt cord made of wholly aromatic polyester fiber,
The tread rubber layer is provided with a foamed rubber having a foaming ratio of 20% or more and 100% or less, which is exposed only inward in the tire radial direction of each circumferential groove and only on a groove bottom surface of the circumferential groove. It is a pneumatic radial tire that does.
【0009】[0009]
【作用】本発明によれば、トレッドゴム層の外周面に
は、タイヤ周方向に連続してのびる周方向溝を形成する
ことにより、タイヤの接地時における連続した排水路を
確保でき、ウエットグリップを維持しうる。According to the present invention, by forming a circumferential groove extending continuously in the tire circumferential direction on the outer peripheral surface of the tread rubber layer, a continuous drainage channel can be secured when the tire is in contact with the ground, and a wet grip is provided. Can be maintained.
【0010】全芳香族ポリエステル繊維は、ベンゼン環
及びベンゼン環が複数縮合した環をもつ芳香族化合物を
エステル結合(−O−CO)した例えば化1に示す分子
構造を有する剛直性の高性能有機繊維であって、いわゆ
るポリアリレート繊維として知られている。The wholly aromatic polyester fiber is a rigid, high-performance organic compound having a molecular structure shown in Chemical formula 1, for example, in which an aromatic compound having a benzene ring and a ring in which a plurality of benzene rings are condensed is ester-bonded (--O--CO). Fibers are known as so-called polyarylate fibers.
【0011】[0011]
【化1】 Embedded image
【0012】[0012]
【表1】 [Table 1]
【0013】[0013]
【表2】 [Table 2]
【0014】このものは表1に示すように、他の高性能
有機繊維として知られる芳香族ポリアミド繊維、いわゆ
るパラ型アラミド繊維(PPAT)とほぼ同程度の高い
引張強度、引張弾性率と低破断伸度とを有し、従ってベ
ルトプライ数の増加を招くことなく十分なベルト層の強
度を保持しうる。又このものは耐屈曲疲労性、即ち例え
ば曲げ角度130度かつ屈曲回数1万回の屈曲テストを
1500d/1、80t/mの短繊維に行った場合の強
力保持率は、表2に示すように全芳香族ポリアミド繊維
が51%であるのに対し全芳香族ポリエステル繊維は9
7%と極めて大である。従ってタイヤの繰返し変形の際
にトレッド部の振動を、騒音域の略全域に亘って低減で
き、タイヤ騒音を低減しうる。As shown in Table 1, this fiber has a high tensile strength, a tensile elastic modulus and a low breaking strength which are almost the same as those of aromatic polyamide fiber known as another high performance organic fiber, so-called para-aramid fiber (PPAT). Elongation, and therefore, sufficient belt layer strength can be maintained without increasing the number of belt plies. Further, this product has flexural fatigue resistance, that is, the tenacity retention ratio when a flexing test of 1500 d / 1, 80 t / m of a short fiber was carried out at a flexing angle of 130 degrees and a flexing number of 10,000 times, as shown in Table 2. The wholly aromatic polyamide fiber is 51%, while the wholly aromatic polyester fiber is 9%.
It is extremely large at 7%. Therefore, when the tire is repeatedly deformed, the vibration of the tread portion can be reduced over almost the entire noise range, and the tire noise can be reduced.
【0015】又、トレッドゴム層は前記各周方向溝の少
なくとも溝底面のみに露出するとともに発泡倍率が20
%以上かつ100%以下の発泡ゴムが設けられている。The tread rubber layer is exposed only at least on the groove bottom surface of each circumferential groove and has a foaming ratio of 20.
% Or more and 100% or less of foamed rubber is provided.
【0016】このような発泡ゴムは、周方向溝内を通過
する空気をその発泡気泡を通じて発泡ゴム内に吸収で
き、気柱共鳴音を低減しうる。Such foamed rubber can absorb air passing through the circumferential groove into the foamed rubber through the foamed bubbles, and can reduce air column resonance noise.
【0017】さらにこの発泡ゴムは、タイヤ走行時にお
いて、トレッドゴムの振動を吸収でき、前記構成のベル
ト層と協同してサイドウォール部の共振を抑制し、タイ
ヤ振動による騒音を抑制しうる。Further, the foamed rubber can absorb the vibration of the tread rubber when the tire is running, and can suppress the resonance of the sidewall portion in cooperation with the belt layer having the above-mentioned structure and the noise due to the tire vibration.
【0018】発泡倍率が20%未満では、周方向溝を通
る空気の流れによる気柱共鳴を発泡ゴムが吸収し得ず騒
音の低減に劣り、又100%をこえるとトレッド部にお
いて周方向溝近傍の剛性が低下することにより操縦安定
性の低下を招く。なお発泡倍率は25%以上かつ80%
以下の範囲とするのがより好ましい。If the expansion ratio is less than 20%, the foamed rubber cannot absorb air column resonance due to the flow of air through the circumferential groove, resulting in poor noise reduction. If it exceeds 100%, the tread portion near the circumferential groove. The reduction in the rigidity of the vehicle causes a decrease in steering stability. The expansion ratio is 25% or more and 80%
The following range is more preferable.
【0019】周方向溝の側壁面に発泡ゴムを設けること
は生産上、容易ではないが溝底に限定して配置すること
は後述するように比較的容易に実施することが出来る。
又、側壁面まで発泡ゴムを延設した場合には、タイヤ走
行時において周方向溝の断面形状が変動し、走行安定性
を低下させ、又石噛時に周方向溝が破損する危険があ
る。Providing the foamed rubber on the side wall surface of the circumferential groove is not easy in production, but arranging it only at the groove bottom can be performed relatively easily as described later.
Further, when the foamed rubber is extended to the side wall surface, the cross-sectional shape of the circumferential groove changes when the tire is running, the running stability is reduced, and there is a risk that the circumferential groove is damaged when stone is caught.
【0020】このように、本発明は、前記各構成要件が
有機的かつ一体的に結合することにより略全音域に亘っ
て騒音を低減しうるのである。As described above, the present invention can reduce the noise over substantially the entire sound range by organically and integrally combining the above constituent elements.
【0021】[0021]
【実施例】以下本発明の一実施例を図面に基づき説明す
る。図1、2において、空気入りラジアルタイヤ1は、
トレッド部2とその両側からタイヤ半径方向内方にのび
る一対のサイドウォール部3と、該サイドウォール部3
の内方にのびるビード部4とを有する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, the pneumatic radial tire 1 is
The tread portion 2 and a pair of sidewall portions 3 extending inward in the tire radial direction from both sides thereof, and the sidewall portion 3
And a bead portion 4 extending inward.
【0022】又空気入りラジアルタイヤ1には、トレッ
ド部2からサイドウォール部3をへてビード部4に至る
本体部6aにビードコア5の周りをタイヤ軸方向内側か
ら外側に向かって折返す折返し部6bを一体に具えるカ
ーカス6と、該カーカス6の外側かつトレッド部の内方
に配されるベルト層7と、このベルト層7の半径方向外
側に配され、かつトレッド面2Aをなすトレッドゴム層
9とを具え、本例では前記カーカス6の本体部6aと折
返し部6bとの間に配され断面三角形状かつ硬質のゴム
からなるビードエーペックス8とが設けられる。Further, in the pneumatic radial tire 1, a folded-back portion is formed by folding the bead core 5 around the body portion 6a from the tread portion 2 through the sidewall portion 3 to the bead portion 4 from the inner side to the outer side in the tire axial direction. A carcass 6 integrally provided with 6b, a belt layer 7 arranged outside the carcass 6 and inside the tread portion, and a tread rubber arranged radially outside the belt layer 7 and forming a tread surface 2A. In this example, a bead apex 8 having a triangular cross section and made of hard rubber is provided between the main body portion 6a of the carcass 6 and the folded portion 6b.
【0023】前記カーカス6は、本例では、1枚のカー
カスプライからなり、各カーカスプライは、ナイロン、
ポリエステル、レーヨン、芳香族ポリアミドなどの有機
繊維からなるカーカスコードをタイヤ赤道Cに対して7
5〜90°の角度で傾けて配列したラジアル、又はセミ
ラジアル配列として形成され、又各カーカスプライの間
では前記カーカスコードが互いに交差する向きに配され
る。In the present example, the carcass 6 is composed of one carcass ply, and each carcass ply is made of nylon,
Carcass cords made of organic fibers such as polyester, rayon, and aromatic polyamide are attached to the tire equator C at 7
The carcass cords are formed in a radial or semi-radial arrangement inclined at an angle of 5 to 90 °, and the carcass cords are arranged so as to intersect each other between the carcass plies.
【0024】ベルト層7は、本実施例では、カーカス6
の半径方向外側かつ該カーカス6に隣接して配される内
のベルトプライ7Aと、この内のベルトプライの外側に
配される外のベルトプライ7Bとからなり、各ベルトプ
ライ7A、7Bは、全芳香族ポリエステルからなる繊維
をタイヤ周方向に対して16〜24°の角度で傾けかつ
互いに逆に配列している。なおベルトプライ7A、7B
は、前記配列したベルトコードをトッピングゴムにより
被覆したカットプライからなる。The belt layer 7 is, in this embodiment, the carcass 6
Of the inner belt ply 7A arranged radially outside of and adjacent to the carcass 6 and an outer belt ply 7B arranged outside the inner belt ply, and each belt ply 7A, 7B is Fibers made of wholly aromatic polyester are inclined at an angle of 16 to 24 with respect to the tire circumferential direction and arranged in reverse. Belt ply 7A, 7B
Is a cut ply obtained by coating the arranged belt cords with a topping rubber.
【0025】ベルトコードは、前述の如く全芳香族ポリ
エステル繊維を用いたことにより、高い強力保持率を有
し、乗用車、小型トラック用のベルトプライに用いる場
合には、デニールが1200d/2〜1800d/2、
打込数が5cm当たり25〜50の範囲とするのが好まし
い。The belt cord has a high tenacity holding ratio by using the wholly aromatic polyester fiber as described above, and when it is used for a belt ply for passenger cars and light trucks, the denier is 1200d / 2 to 1800d. / 2,
The number of shots is preferably in the range of 25 to 50 per 5 cm.
【0026】トレッドゴム層9は、JISA硬度が55
〜70度のゴムからなり、トレッド面2Aを形成すると
ともに、そのトレッド面2Aには複数の本例では4条の
周方向溝10…を含む溝部が設けられる。The tread rubber layer 9 has a JISA hardness of 55.
The tread surface 2A is made of rubber having a hardness of about 70 degrees, and the tread surface 2A is provided with a plurality of groove portions including four circumferential grooves 10 in this example.
【0027】トレッドゴム層9には、前記周方向溝10
の半径方向内方に位置してかつその溝底面10Aに露出
して周回する発泡ゴム11が埋設される。この発泡ゴム
11は、例えば表3に示すゴム組成A乃至Dによって形
成される。In the tread rubber layer 9, the circumferential groove 10 is formed.
The foamed rubber 11 which is located radially inward and is exposed at the groove bottom surface 10A and circulates is embedded. The foamed rubber 11 is formed of, for example, the rubber compositions A to D shown in Table 3.
【0028】前記発泡ゴム11は、独立した気泡を有
し、発泡倍率は、20〜100%、好ましくは25〜8
0%である。この発泡倍率が小さすぎると吸音効果に劣
る一方、大きすぎると操縦安定性を悪化させる傾向が強
くなるからである。The foamed rubber 11 has independent cells, and the expansion ratio is 20 to 100%, preferably 25 to 8%.
It is 0%. This is because if the expansion ratio is too small, the sound absorbing effect is poor, while if it is too large, the steering stability tends to be worsened.
【0029】この発泡ゴムの半径方向のゴム厚さTは、
それが配される周方向溝10の溝深さGHの0.1倍以
上かつ0.5倍以下、しかもベルト層7との間にトレッ
ドゴム層9を介在させている。ゴム厚さTが溝深さGH
の0.1倍未満では吸音効果に劣り0.5倍をこえると
操縦安定性を阻害する危険があるからである。The rubber thickness T in the radial direction of this foamed rubber is
The tread rubber layer 9 is provided between the belt layer 7 and 0.1 times or more and 0.5 times or less the groove depth GH of the circumferential groove 10 in which it is arranged. Rubber thickness T is groove depth GH
If it is less than 0.1 times, the sound absorbing effect is inferior, and if it exceeds 0.5 times, there is a risk of impairing steering stability.
【0030】なお、発泡ゴム11のタイヤ軸方向の巾
は、溝底10Aの巾と略等しくするのが好ましいが周方
向溝10の溝巾を若干はみ出す寸法であってもよい。The width of the foamed rubber 11 in the axial direction of the tire is preferably substantially equal to the width of the groove bottom 10A, but may be slightly larger than the groove width of the circumferential groove 10.
【0031】このような発泡ゴムをトレッドゴム層に配
設するために、未加硫のトレッドゴムを押出しする際に
おいて、この発泡ゴムが嵌装される空所を予め設けて未
加硫のトレッドゴムを形成し、その空所に発泡ゴムを嵌
着させ、加硫処理により両者を一体化することにより得
られる。In order to dispose such a foamed rubber in the tread rubber layer, when the unvulcanized tread rubber is extruded, a space in which the foamed rubber is fitted is provided in advance and the unvulcanized tread is provided. It is obtained by forming rubber, fitting foamed rubber into the void, and integrating both by vulcanization.
【0032】[0032]
【具体例】タイヤサイズが、180/70R14であり
かつ表4に示す仕様にて試作する(実施例)とともに、
その性能についてテストを行った。なお従来構成のタイ
ヤ(従来例)及び本願構成外のタイヤ(比較例1、2)
についても併せてテストを行い性能の比較を行った。テ
スト方法は次の通り。SPECIFIC EXAMPLE A tire size is 180 / 70R14 and a prototype is produced according to the specifications shown in Table 4 (Example),
The performance was tested. In addition, tires having conventional configurations (conventional examples) and tires having configurations other than the configurations of the present application (comparative examples 1 and 2)
Also, a test was conducted to compare the performance. The test method is as follows.
【0033】イ)ロードノイズ 荒れたアスファルト路における速度50km/h時のオー
バオールの騒音をマイクロフォンを運転席中央側耳元に
置き測定した。A) Road noise The overall noise on a rough asphalt road at a speed of 50 km / h was measured by placing a microphone near the center ear of the driver's seat.
【0034】テスト結果を表4に示し、その騒音の周波
数分析を行った結果を図3に示す。The test results are shown in Table 4, and the results of frequency analysis of the noise are shown in FIG.
【0035】[0035]
【表4】 [Table 4]
【0036】テストの結果、実施例のものは従来例、比
較例のものに比べてロードノイズが低減され、かつその
低減は、低周波域、高周波域の何れにも及んでいること
が確認できた。As a result of the test, it was confirmed that the road noise of the example was lower than that of the conventional example and the comparative example, and that the reduction was in the low frequency region and the high frequency region. It was
【0037】[0037]
【発明の効果】叙上の如く、本発明のタイヤは、前記構
成を具えることにより、操縦安定性、ウエットグリップ
性、及び乗心地を保持しつつ走行時におけるタイヤから
生じる騒音を騒音周波数の略全域に亘って低減しうる。As described above, the tire of the present invention is provided with the above-mentioned constitution, so that the noise generated from the tire at the time of running can be suppressed while keeping the steering stability, the wet grip property, and the riding comfort. It can be reduced over almost the entire area.
【図1】本発明の一実施例を示す右半分断面図である。FIG. 1 is a right half sectional view showing an embodiment of the present invention.
【図2】その要部を拡大して示す断面図である。FIG. 2 is a cross-sectional view showing an enlarged main part thereof.
【図3】騒音の周波数分析を示すグラフである。FIG. 3 is a graph showing frequency analysis of noise.
【符号の説明】 2 トレッド部 2A トレッド面 3 サイドウォール部 4 ビード部 5 ビードコア 6 カーカス 7 ベルト層 9 トレッドゴム層 10 周方向溝 10A 溝底面 11 発泡ゴム[Explanation of symbols] 2 tread portion 2A tread surface 3 sidewall portion 4 bead portion 5 bead core 6 carcass 7 belt layer 9 tread rubber layer 10 circumferential groove 10A groove bottom surface 11 foam rubber
【表3】 [Table 3]
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 D02G 3/48 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location D02G 3/48
Claims (1)
ード部のビードコアの周りを折返すとともにラジアル配
列のカーカスコードからなるカーカスと、トレッド部の
内部かつカーカスの半径方向外側に配されるベルト層
と、前記ベルト層の半径方向外側に配されトレッド面を
なすトレッドゴム層とを具え、しかも前記トレッド面に
周方向にのびる複数の周方向溝を設けた空気入りラジア
ルタイヤであって、 前記ベルト層は全芳香族ポリエステル繊維からなるベル
トコードを用いたベルトプライによって形成されるとと
もに、トレッドゴム層は、前記各周方向溝のタイヤ半径
方向内方かつ該周方向溝の溝底面にのみ露出するととも
に発泡倍率が20%以上かつ100%以下の発泡ゴムが
設けられたことを特徴とする空気入りラジアルタイヤ。1. A carcass comprising a carcass cord of radial arrangement and folding around a bead core of a bead part through a sidewall part from a tread part, and a belt layer arranged inside the tread part and radially outside the carcass. A pneumatic radial tire having a tread rubber layer disposed on the outer side in the radial direction of the belt layer and forming a tread surface, and further having a plurality of circumferential grooves extending in the circumferential direction on the tread surface, wherein the belt layer Is formed by a belt ply using a belt cord made of wholly aromatic polyester fiber, and the tread rubber layer is exposed only inward in the tire radial direction of each circumferential groove and on the groove bottom surface of the circumferential groove. A pneumatic radial tire provided with a foamed rubber having a foaming ratio of 20% or more and 100% or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33023594A JP3354328B2 (en) | 1994-12-05 | 1994-12-05 | Pneumatic radial tire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33023594A JP3354328B2 (en) | 1994-12-05 | 1994-12-05 | Pneumatic radial tire |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08156526A true JPH08156526A (en) | 1996-06-18 |
JP3354328B2 JP3354328B2 (en) | 2002-12-09 |
Family
ID=18230379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP33023594A Expired - Fee Related JP3354328B2 (en) | 1994-12-05 | 1994-12-05 | Pneumatic radial tire |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3354328B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008037260A (en) * | 2006-08-07 | 2008-02-21 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
JP2010143521A (en) * | 2008-12-22 | 2010-07-01 | Bridgestone Corp | Tire |
CN108909376A (en) * | 2018-06-27 | 2018-11-30 | 安徽省中日农业环保科技有限公司 | A kind of agricultural equipment antiskid device for tyre |
-
1994
- 1994-12-05 JP JP33023594A patent/JP3354328B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008037260A (en) * | 2006-08-07 | 2008-02-21 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
JP2010143521A (en) * | 2008-12-22 | 2010-07-01 | Bridgestone Corp | Tire |
CN108909376A (en) * | 2018-06-27 | 2018-11-30 | 安徽省中日农业环保科技有限公司 | A kind of agricultural equipment antiskid device for tyre |
Also Published As
Publication number | Publication date |
---|---|
JP3354328B2 (en) | 2002-12-09 |
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