JP5164730B2 - Precure tread and retreaded tire using the same - Google Patents

Precure tread and retreaded tire using the same Download PDF

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JP5164730B2
JP5164730B2 JP2008206035A JP2008206035A JP5164730B2 JP 5164730 B2 JP5164730 B2 JP 5164730B2 JP 2008206035 A JP2008206035 A JP 2008206035A JP 2008206035 A JP2008206035 A JP 2008206035A JP 5164730 B2 JP5164730 B2 JP 5164730B2
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tread
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precure tread
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groove
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修 藤原
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Bridgestone Corp
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Description

本発明は、タイヤを更生する際に用いるプレキュアトレッド、特に、トレッド接地面に形成した周方向溝に起因した気柱共鳴音の低減を可能とするプレキュアトレッドおよびこれを用いた更生タイヤに関するものである。   TECHNICAL FIELD The present invention relates to a precure tread used for retreading a tire, and more particularly to a precure tread that enables reduction of air column resonance caused by a circumferential groove formed on a tread contact surface and a retread tire using the precure tread. Is.

近年の車両の静粛化に伴って、自動車騒音におけるタイヤ騒音の占める割合が相対的に大きくなっているため、そのタイヤ騒音の低減が大きな課題となっている。なかでも、１０００Ｈｚ前後のタイヤ騒音は車外騒音の主な要因となっており、この騒音は、環境問題の点からも早急な対策が望まれている。   With the recent quietness of vehicles, the proportion of tire noise in automobile noise has become relatively large, so reducing tire noise has become a major issue. Among these, tire noise around 1000 Hz is a major factor of noise outside the vehicle, and an immediate countermeasure is desired for this noise from the viewpoint of environmental problems.

ところで、一般的なトラックやバスにおいて、５００〜２０００Ｈｚの周波数帯域に属するタイヤ騒音は、タイヤの接地面内で、トレッドに形成した周方向溝と路面とによって区画される気柱が共鳴すること、いわゆる気柱共鳴によって発生することが知られている。
すなわち、周方向溝を有するタイヤが接地した状態において、該周方向溝の溝壁と、接地面との間に接地長と同じ長さの管が形成され、タイヤの走行に伴い、気柱共鳴音と呼ばれるノイズが発生する。この気柱共鳴音の周波数ｆ０は、音速をｃとし、管の長さ、すなわち、周方向溝の長さに開口端補正量を足したものをＬとすると、
ｆ０＝ｃ／２Ｌ
で表わされる一定の周波数である。なお、開口端補正量とは、通常は実験によって求められるものであり、管が円筒形の場合、管の内側の半径に定数を乗じたものとなる。 By the way, in general trucks and buses, tire noise belonging to a frequency band of 500 to 2000 Hz is caused by resonance of air columns defined by circumferential grooves and road surfaces formed in the tread within the tire contact surface. It is known to occur by so-called air column resonance.
In other words, when a tire having a circumferential groove is in contact with the ground, a tube having the same length as the contact length is formed between the groove wall of the circumferential groove and the contact surface. Noise called sound is generated. The frequency f 0 of the air column resonance sound is defined as L, where the speed of sound is c, the length of the tube, that is, the length of the circumferential groove and the opening end correction amount is added.
f 0 = c / 2L
It is a constant frequency represented by The opening end correction amount is normally obtained by experiment, and when the tube is cylindrical, it is obtained by multiplying the radius inside the tube by a constant.

この気柱共鳴音は高いピークを有し、周波数帯域も広いため、騒音の中でもタイヤ起因の直接音となる主要な要因のひとつである。また、人間の聴覚は、人間の聴覚感度特性を反映したＡ特性と呼ばれる周波数補正特性で示されるように、１０００Ｈｚ前後の周波数帯域で敏感であり、この気柱共鳴音の低減は車室内の静粛性向上および道路近傍の騒音低減に非常に有効である。   This air column resonance sound has a high peak and a wide frequency band, and is one of the main factors that cause a direct sound due to tires among noises. In addition, human hearing is sensitive in a frequency band around 1000 Hz, as indicated by a frequency correction characteristic called A characteristic that reflects human auditory sensitivity characteristics, and this reduction in air column resonance is quiet in the passenger compartment. It is very effective for improving the performance and reducing the noise near the road.

このような気柱共鳴の抑制のために、特許文献１、２には、トレッド接地面に周方向に連続して延びる周方向溝を設けるとともに、周方向溝から離れた位置で陸部表面に開口する気室部とこの気室部を前記周方向溝に連通させる枝溝とからなる、いわゆるヘルムホルツ共鳴器となる分岐溝を配設したタイヤが提案されている。
ヘルムホルツ共鳴器は、図１に模式的に示すように、音速をｃ、枝溝に対応する管状部１の長さをｌ、管状部１の断面積をＳ、管状部１の半径をｒ、気室部２の体積をＶとすると、減音する周波数ｆは、

Figure 0005164730
で表されることが分かっている。 In order to suppress such air column resonance, Patent Documents 1 and 2 provide a circumferential groove extending continuously in the circumferential direction on the tread ground surface, and on the land surface at a position away from the circumferential groove. There has been proposed a tire provided with a branch groove that is a so-called Helmholtz resonator, which is composed of an open air chamber portion and a branch groove that communicates the air chamber portion with the circumferential groove.
As schematically shown in FIG. 1, the Helmholtz resonator has a sound velocity of c, a length of the tubular portion 1 corresponding to the branch groove, l, a cross-sectional area of the tubular portion 1, S, a radius of the tubular portion 1 r, Assuming that the volume of the air chamber 2 is V, the frequency f to be reduced is
Figure 0005164730
 It is known that

また、特許文献３、４には、トレッド接地面に周方向に連続して延びる周方向溝と、この周方向溝に連通しトレッド内部に埋設されたヘルムホルツ共鳴器とを具えるタイヤが提案されている。   Further, Patent Documents 3 and 4 propose a tire including a circumferential groove continuously extending in the circumferential direction on the tread contact surface and a Helmholtz resonator embedded in the tread in communication with the circumferential groove. ing.

ところで、近年、環境問題に配慮するために、タイヤをリサイクルする需要が高まってきている。リサイクルしたタイヤは、更生タイヤとして広く知られている。更生タイヤは使用済みのタイヤからトレッド又はトレッドと一部のベルト層を削除して台タイヤとし、この台タイヤにトレッド部として新しい素材を張りつけたものをいう。更生タイヤの製造方法には、台タイヤに未加硫トレッドゴムを張り合わせて金型内で加硫する方法と、トレッドゴムを予め長尺のモールドでパターン付けおよび加硫を行って、プレキュアトレッドを形成し、かかるプレキュアトレッドを台タイヤに比較的低温かつ接着面において低圧状態で加硫接着する方法とがある（例えば、特許文献５を参照）。
特開平５−３３８４１１号公報 特開２００７−２６９１４４号公報 特開２０００−１１８２０７号公報 特開２００１−２３９８０９号公報 特開平１０−１１９０５４号公報 By the way, in recent years, in order to consider environmental problems, the demand for recycling tires has increased. Recycled tires are widely known as retreaded tires. A retread tire is a tire obtained by removing a tread or a tread and a part of a belt layer from a used tire to form a base tire, and a new material is attached to the base tire as a tread portion. The retreaded tire manufacturing method includes a method in which an unvulcanized tread rubber is laminated to a base tire and vulcanized in a mold, and the tread rubber is previously patterned and vulcanized with a long mold, and a pre-cured tread is obtained. And vulcanizing and bonding the precure tread to the base tire at a relatively low temperature and a low pressure state on the bonding surface (see, for example, Patent Document 5).
Japanese Patent Laid-Open No. 5-338411 JP 2007-269144 A JP 2000-118207 A Japanese Patent Laid-Open No. 2001-239809 JP-A-10-119054

ここで、更生タイヤにおいても、上述した例と同様に、騒音の低減は必要とされてきたが、未だ操縦安定性および摩耗性能を損なうことなく、騒音を十分に低減させた例は提案されていない。
それゆえ、本発明の目的は、タイヤの更生に用いるプレキュアトレッドにおいて、周方向溝に起因した気柱共鳴音を低減する方途を与え、さらにこのプレキュアトレッドおよびこれを用いた更生タイヤを提供することにある。 Here, in the retreaded tire, as in the example described above, noise reduction has been required, but an example in which noise has been sufficiently reduced without impairing steering stability and wear performance has been proposed. Absent.
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for reducing air column resonance caused by a circumferential groove in a precure tread used for tire retreading, and further to provide this precure tread and a retread tire using the precure tread. There is to do.

本発明の要旨は、以下のとおりである。
（１）タイヤの接地面側となる表面と台タイヤに貼り付ける側となる背面とを有するプレキュアトレッドにおいて、
前記表面にタイヤ周方向に沿って延びる少なくとも１本の周方向溝を有し、さらに、該周方向溝に連通するとともに前記プレキュアトレッドの厚み方向内側に設けた少なくとも１つの共鳴器を具え、
前記共鳴器が、前記周方向溝に一端が開口する管状部と、該管状部の他端に接続し、該管状部の断面積よりも大きな断面積を有する気室部とを具え、
前記気室部が、前記背面に開口し、トレッド部接地面の摩耗の進行に伴って該トレッド部接地面に露出する背面溝を区切ることで形成されることを特徴とするプレキュアトレッド。 The gist of the present invention is as follows.
(1) In a precure tread having a surface that is a ground contact surface side of a tire and a back surface that is a side to be attached to a base tire,
It has at least one circumferential groove extending along the tire circumferential direction on the surface, and further includes at least one resonator that communicates with the circumferential groove and is provided on the inner side in the thickness direction of the precure tread,
The resonator includes a tubular portion having one end opened in the circumferential groove, and an air chamber portion connected to the other end of the tubular portion and having a cross-sectional area larger than the cross-sectional area of the tubular portion,
The air chamber portion, the opening on the back, up-les tread that with the progress of the tread portion contact surface wear, characterized in that it is formed by separating the rear groove is exposed to the tread portion a ground plane.

（２）前記管状部が、前記周方向溝の溝底に開口することを特徴とする上記（１）に記載のプレキュアトレッド。 ( 2 ) The precure tread as described in (1) above, wherein the tubular portion opens at a groove bottom of the circumferential groove.

（３）前記管状部が、吸音層を有することを特徴とする上記（１）または（２）に記載のプレキュアトレッド。 ( 3 ) The precure tread as described in (1) or (2) above, wherein the tubular portion has a sound absorbing layer.

（４）前記共鳴器が複数であって、各共鳴器の共鳴周波数が異なることを特徴とする上記（１）〜（３）のいずれかに記載のプレキュアトレッド。 ( 4 ) The precure tread according to any one of the above (1) to ( 3 ), wherein the resonator has a plurality of resonators, and each resonator has a different resonance frequency.

（５）上記（１）〜（４）のいずれかに記載のプレキュアトレッドを台タイヤに接着して用いることを特徴とする更生タイヤ。 ( 5 ) A retread tire characterized in that the precure tread according to any one of (1) to ( 4 ) is adhered to a base tire.

本発明によれば、周方向溝に起因した気柱共鳴音を低減したプレキュアトレッドおよびこれを用いた更生タイヤを提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the precure tread which reduced the air column resonance sound resulting from the circumferential groove | channel, and a retreaded tire using the same can be provided.

以下、図面を参照しながら本発明を詳細に説明する。
図２（ａ）は本発明のプレキュアトレッドの斜視図であり、図２（ｂ）は本発明のプレキュアトレッドの断面図である。このプレキュアトレッド１０は、タイヤの接地面側となる表面１０ａと台タイヤに貼り付ける側となる背面１０ｂとを有し、表面１０ａにタイヤ周方向に沿って延びる少なくとも１本、図示例では４本の周方向溝１１と、この周方向溝１１に連通するとともにこのプレキュアトレッド１０の厚み方向内側に設けた少なくとも１つの共鳴器３とを具える。共鳴器３は、周方向溝１１に一端が開口する管状部１と、管状部１の他端に接続し、管状部１の断面積よりも大きな断面積を有する気室部２とを具える。
このように、ヘルムホルツ型の共鳴器３をプレキュアトレッド１０の周方向溝１１に設けることにより、このプレキュアトレッド１０を用いた更生タイヤにおいて騒音を低減することが可能となる。また、プレキュアトレッド１０は共鳴器３をプレキュアトレッド１０の厚み方向内側に有するため、共鳴器３によって表面１０ａのトレッドパターンを変更する必要はない。それゆえ、本発明のプレキュアトレッド１０を台タイヤに接着して更生タイヤとした際、この更生タイヤはトレッドパターンによる良好な操縦安定性および摩耗性能を維持することができる。
なお、図２の例ではヘルムホルツ型の共鳴器３を説明したが、共鳴器３はサイドブランチ型とすることもできる。 Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 2A is a perspective view of the precure tread of the present invention, and FIG. 2B is a cross-sectional view of the precure tread of the present invention. The precure tread 10 has a surface 10a that is a tire contact surface side and a back surface 10b that is affixed to a base tire. At least one that extends along the tire circumferential direction on the surface 10a, 4 in the illustrated example. A circumferential groove 11 of the book and at least one resonator 3 that communicates with the circumferential groove 11 and is provided on the inner side in the thickness direction of the precure tread 10 are provided. The resonator 3 includes a tubular portion 1 having one end opened in the circumferential groove 11 and an air chamber portion 2 connected to the other end of the tubular portion 1 and having a cross-sectional area larger than the cross-sectional area of the tubular portion 1. .
As described above, by providing the Helmholtz type resonator 3 in the circumferential groove 11 of the precure tread 10, noise can be reduced in a retread tire using the precure tread 10. Further, since the precure tread 10 has the resonator 3 on the inner side in the thickness direction of the precure tread 10, it is not necessary to change the tread pattern on the surface 10a by the resonator 3. Therefore, when the precure tread 10 of the present invention is bonded to a base tire to obtain a retread tire, the retread tire can maintain good steering stability and wear performance due to the tread pattern.
Although the Helmholtz type resonator 3 has been described in the example of FIG. 2, the resonator 3 may be a side branch type.

ここで、図３に示した本発明のその他のプレキュアトレッドのように、気室部２が背面１０ｂに開口することが好適である。すなわち、トレッドゴムを加硫するための金型にあらかじめ凸部を設けることによって、背面１０ｂに開口する気室部２を容易に形成することができる。さらにこの気室部２と周方向溝１１とを連通する管状部１も容易に形成することができるため、周方向溝１１に連通する共鳴器３を製造する上で有利である。   Here, like the other precure tread of the present invention shown in FIG. 3, it is preferable that the air chamber portion 2 opens to the back surface 10b. That is, the air chamber part 2 opened to the back surface 10b can be easily formed by providing a convex part in the mold for vulcanizing the tread rubber in advance. Furthermore, since the tubular portion 1 that communicates the air chamber portion 2 and the circumferential groove 11 can be easily formed, it is advantageous in manufacturing the resonator 3 that communicates with the circumferential groove 11.

また、図４に示した本発明のその他のプレキュアトレッドのように、気室部が、トレッド部接地面の摩耗の進行に伴ってトレッド部接地面に露出する背面溝であることが好適である。このような構成とすることにより、背面溝１２は、トレッド部接地面の摩耗初期段階で周方向溝１１に起因する気柱共鳴音を低減するためのヘルムホルツ共鳴器の気室部として働き、トレッド部接地面の摩耗後期段階で周方向溝として働くことから、摩耗初期から末期に至るまで良好なウェット性能を達成することが可能となる。
なお、複数の管状部１によって１本の周方向溝１１と気室部である背面溝１２とを接続しているため、管状部１の本数をｎ本とすると、減音される共鳴周波数ｆは、上記した式（１）を用いて

Figure 0005164730
として表される。 Further, like the other precure tread of the present invention shown in FIG. 4, it is preferable that the air chamber portion is a back groove that is exposed to the tread portion grounding surface as the tread portion grounding surface wears. is there. With such a configuration, the back groove 12 functions as an air chamber of a Helmholtz resonator for reducing air column resonance caused by the circumferential groove 11 in the initial stage of wear of the tread portion grounding surface. Since it acts as a circumferential groove at the later stage of wear of the partial ground contact surface, it is possible to achieve good wet performance from the early stage to the late stage of wear.
In addition, since the one circumferential groove | channel 11 and the back surface groove | channel 12 which is an air chamber part are connected by the some tubular part 1, if the number of the tubular parts 1 is n, the resonance frequency f to which sound is reduced Using the above equation (1)
Figure 0005164730
 Represented as:

また、気室部は、例えばゴム壁で背面溝１２を区切ることで形成されることが好適である。この場合、ゴム壁で背面溝１２を区切る間隔を調整することによって、気室部の体積を調整できるため、所望の共鳴周波数を低減することができる。   In addition, the air chamber portion is preferably formed by dividing the back groove 12 with, for example, a rubber wall. In this case, since the volume of the air chamber can be adjusted by adjusting the interval that divides the back groove 12 by the rubber wall, the desired resonance frequency can be reduced.

上述した図示例では、管状部１は周方向溝１１の溝壁に開口しているが、管状部１は周方向溝１１の溝底に開口することが好適である。なぜなら、トレッド部接地面の摩耗が進行しても共鳴器３が共鳴器として機能することができるからである。   In the illustrated example described above, the tubular portion 1 opens in the groove wall of the circumferential groove 11, but the tubular portion 1 preferably opens in the groove bottom of the circumferential groove 11. This is because the resonator 3 can function as a resonator even when wear on the tread portion ground contact surface proceeds.

また、管状部１の壁面に吸音層、例えば不織布、発泡ゴム、発泡ウレタンを設けることが好適である。共鳴器３内の粒子速度は管状部１の入り口側程高く、気室部２内では低い。粒子速度が高い管状部１に吸音層を設けることにより、共鳴器３の減衰特性を効果的に高めることができ、その結果、幅広い帯域での音圧レベルの減衰が可能となる。   Further, it is preferable to provide a sound absorbing layer such as a nonwoven fabric, foamed rubber, or foamed urethane on the wall surface of the tubular portion 1. The particle velocity in the resonator 3 is higher at the inlet side of the tubular portion 1 and lower in the air chamber portion 2. By providing the sound absorbing layer in the tubular portion 1 having a high particle velocity, the attenuation characteristics of the resonator 3 can be effectively enhanced, and as a result, the sound pressure level can be attenuated in a wide band.

また、共鳴器３を複数設けて、各共鳴器３の共鳴周波数が異なるように、各共鳴器３の管状部１の長さｌ、断面積Ｓ、半径ｒおよび気室部２の体積Ｖを調整することが好適である。なぜなら、１種類の共鳴器を用いた場合には、その共鳴周波数でのみ大きく減音し、その共鳴周波数の前後の周波数では音圧が悪化するが、共鳴周波数が異なる共鳴器を多数用いることにより、悪化帯域がなくなり、その周波数帯域に亘って騒音を低減することができるためである。   Also, a plurality of resonators 3 are provided, and the length l, the cross-sectional area S, the radius r, and the volume V of the air chamber 2 are set so that the resonance frequency of each resonator 3 is different. It is preferable to adjust. This is because when one type of resonator is used, the sound is greatly reduced only at the resonance frequency, and the sound pressure deteriorates at frequencies before and after the resonance frequency, but by using many resonators having different resonance frequencies. This is because there is no worse band and noise can be reduced over the frequency band.

また、複数の共鳴器３を設ける場合は、図５（ａ）（ｂ）にプレキュアトレッドの背面図を示すように、共鳴器３は整列している必要はなく、分散して配置することが可能である。
さらに、共鳴器３の気室部２は、その断面が、図６（ａ）に示すような長方形の場合だけでなく、図６（ｂ）に示すような円形や、図８（ｃ）に示すような任意の形とすることもできる。 Further, when a plurality of resonators 3 are provided, the resonators 3 do not need to be aligned and are dispersedly arranged as shown in the rear views of the precure tread in FIGS. 5 (a) and 5 (b). Is possible.
Furthermore, the air chamber portion 2 of the resonator 3 is not only in the case of a rectangle as shown in FIG. 6A, but also in a circle as shown in FIG. It can be in any shape as shown.

本発明のプレキュアトレッド、従来例のプレキュアトレッドおよび比較例のプレキュアトレッドを、後述する仕様のもとに試作し、性能の評価を行った。   The precure tread of the present invention, the precure tread of the conventional example, and the precure tread of the comparative example were prototyped under the specifications described later, and the performance was evaluated.

従来例のプレキュアトレッドは、図７（ａ）に示す表面のトレッドパターンと、図７（ｂ）に示す背面のパターンを有する。従来例のプレキュアトレッドは、表面１０ａに４本の周方向溝１１ａ〜１１ｄを有し、２本の周方向溝１１ａ、１１ｂおよび周方向溝１１ｃ、１１ｄをそれぞれラグ溝１３で接続している。また、従来例のプレキュアトレッドは背面１０ｂに２本の背面溝１２を有し、各背面溝１２はそれぞれ周方向溝１１ａと１１ｂとの間、および周方向溝１１ｃと１１ｄとの間に配置されている。
比較例のプレキュアトレッドは、図８（ａ）に示す表面のトレッドパターンと、図８（ｂ）に示す背面のパターンを有する。比較例のプレキュアトレッドは、表面１０ａに４本の周方向溝１１ａ〜１１ｄを有し、２本の周方向溝１１ａと１１ｂとの間に、周方向溝１１ａに連通するラグ溝１４を有し、２本の周方向溝１１ｃと１１ｄとの間に、周方向溝１１ｄに連通するラグ溝１４を有する。ラグ溝１４は、路面と接地することでヘルムホルツ型の共鳴器を構成する。また、比較例のプレキュアトレッドの背面１０ｂは、従来例のプレキュアトレッドの背面１０ｂと同様の構造である。 The precure tread of the conventional example has a tread pattern on the front surface shown in FIG. 7A and a pattern on the back surface shown in FIG. 7B. The precure tread of the conventional example has four circumferential grooves 11a to 11d on the surface 10a, and the two circumferential grooves 11a and 11b and the circumferential grooves 11c and 11d are connected by the lug grooves 13, respectively. . The conventional precure tread has two back grooves 12 on the back surface 10b, and each back surface groove 12 is disposed between the circumferential grooves 11a and 11b and between the circumferential grooves 11c and 11d, respectively. Has been.
The precure tread of the comparative example has a tread pattern on the surface shown in FIG. 8A and a back pattern shown in FIG. The precure tread of the comparative example has four circumferential grooves 11a to 11d on the surface 10a, and has a lug groove 14 communicating with the circumferential groove 11a between the two circumferential grooves 11a and 11b. In addition, a lug groove 14 communicating with the circumferential groove 11d is provided between the two circumferential grooves 11c and 11d. The lug groove 14 constitutes a Helmholtz resonator by being in contact with the road surface. The backside 10b of the precure tread of the comparative example has the same structure as the backside 10b of the precure tread of the conventional example.

参考例および発明例２〜５のプレキュアトレッドは、図９（ａ）〜図１１（ａ）に示すように同一の表面のトレッドパターンを有し、図９（ｂ）〜図１１（ｂ）に示す背面のパターンをそれぞれ有する。
参考例のプレキュアトレッドは、図９（ｂ）に示すように、背面１０ｂに２本の背面溝１２を有し、この背面溝１２は複数の管状部１で周方向溝１１ｂと１１ｃとに接続されている。
発明例２、３のプレキュアトレッドは、図１０（ｂ）に示すように、参考例のプレキュアトレッドの背面溝１２をゴム壁１５で区切ることで複数の気室部とし、各気室部ごとに１つの管状部１を設け、この管状部１が気室部と周方向溝１１ｂあるいは１１ｃとを接続している。発明例２では、周方向溝１１ｂ、１１ｃの溝底に管状部１が連通し、発明例３では、周方向溝１１ｂ、１１ｃの溝壁に管状部１が連通している。
発明例４のプレキュアトレッドは、図１１（ｂ）に示すように、背面溝１２をゴム壁１５で区切って異なる体積の気室部を形成している。
発明例５のプレキュアトレッドは、発明例２のプレキュアトレッドの構造を有し、管状部１に不織布を設けている。 The precure treads of Reference Examples and Invention Examples 2 to 5 have tread patterns on the same surface as shown in FIGS. 9 (a) to 11 (a), and FIGS. 9 (b) to 11 (b). Each has a back pattern as shown in FIG.
As shown in FIG. 9B, the precure tread of the reference example has two back surface grooves 12 on the back surface 10b. The back surface groove 12 is a plurality of tubular portions 1 and is formed into circumferential grooves 11b and 11c. It is connected.
As shown in FIG. 10 (b), the precure treads of Invention Examples 2 and 3 have a plurality of air chamber portions by dividing the back groove 12 of the precure tread of the reference example by rubber walls 15, and each air chamber portion. One tubular portion 1 is provided for each, and this tubular portion 1 connects the air chamber portion and the circumferential groove 11b or 11c. In Invention Example 2, the tubular portion 1 communicates with the groove bottoms of the circumferential grooves 11b and 11c, and in Invention Example 3, the tubular portion 1 communicates with the groove walls of the circumferential grooves 11b and 11c.
In the precure tread of Invention Example 4, as shown in FIG. 11B, the back groove 12 is divided by a rubber wall 15 to form air chamber portions having different volumes.
The precure tread of Invention Example 5 has the structure of the precure tread of Invention Example 2, and the tubular portion 1 is provided with a nonwoven fabric.

各試作プレキュアトレッドを用いて、摩耗した１１Ｒ２２．５のタイヤを通常の方法で更生した。これらの更生タイヤを７．２×２２．５Ｊのリムに組み付けてタイヤ車輪とし、タイヤ内圧を９００ｋＰａに調整し、操縦安定性能、偏摩耗性能および騒音低減性能の試験を実施した。その結果を表１に示す。   Using each prototype precure tread, a worn 11R22.5 tire was rehabilitated in the usual manner. These retreaded tires were assembled on a 7.2 × 22.5J rim to form a tire wheel, the tire internal pressure was adjusted to 900 kPa, and tests for steering stability performance, uneven wear performance, and noise reduction performance were performed. The results are shown in Table 1.

＜操縦安定性能試験＞
各更生タイヤを、２−Ｄ・４軸形式の大型トラックの駆動輪に装着し、荷重を積荷で与え、ドライバーによるフィーリング評価を１０段階で行った。この数値が大きいほど操縦安定性能が良好であることを意味している。 <Steering stability test>
Each retread tire was mounted on the driving wheel of a 2-D / 4-axis large truck, the load was applied as a load, and the driver evaluated the feeling in 10 stages. The larger this value, the better the steering stability performance.

＜偏摩耗試験＞
各更生タイヤを、２−Ｄ・４軸形式の大型トラックの駆動輪に装着し、荷重を積荷で与え、１００００ｋｍ走行した後に、ラグ溝を配置した２本のリブ内でタイヤ幅方向摩耗量差を左右輪で平均し、従来例を１００とした指数で評価した。この数値が小さいほど偏摩耗が小さいことを意味している。数値が３以上異なるときに優位差がある。 <Uneven wear test>
Each rehabilitated tire is mounted on the driving wheel of a 2-D / 4-axis large truck, and the load is applied as a load. After running 10,000 km, the difference in the tire width direction wear amount between the two ribs in which the lug grooves are arranged Was averaged with the left and right wheels, and the index was evaluated using an index with the conventional example as 100. It means that uneven wear is so small that this figure is small. There is a dominant difference when the numbers differ by 3 or more.

＜騒音試験＞
各更生タイヤに、荷重０％（空車）、５０％、７５％、１００％（最大負荷能力に対する割合）を与え、欧州タイヤ単体騒音規制（Detective2001/43/EC）に定められている実車蛇行試験法の条件（Ｃ３条件）にて騒音試験を行った。
また、各更生タイヤを５０％摩耗させた状態で、荷重７５％を与えて、同様の試験を行った。なお、この５０％摩耗時には、いずれの更生タイヤも背面溝は露出していない。 <Noise test>
Each rehabilitated tire is given a load of 0% (empty car), 50%, 75%, and 100% (percentage of maximum load capacity), and an actual vehicle meandering test stipulated in the European Tire Unit Noise Regulation (Detective2001 / 43 / EC) A noise test was conducted under the conditions of the method (C3 condition).
Further, the same test was performed with a load of 75% applied in a state where each retread tire was worn 50%. At the time of this 50% wear, the rear groove is not exposed in any of the retreaded tires.

Figure 0005164730
Figure 0005164730

表１より、参考例および発明例２〜５のプレキュアトレッドは、従来例と比較して、同等の操縦安定性能および偏摩耗性能を維持しながら、５０％摩耗時も含めて全ての荷重において、騒音レベルが低減していることが分かる。
以上より、操縦安定性能および偏摩耗性能を損なうことなく、周方向溝に起因した気柱共鳴音を低減したプレキュアトレッドおよびこれを用いた更生タイヤを提供すること可能となった。 From Table 1, the precure treads of the reference examples and invention examples 2 to 5 maintain the same steering stability performance and uneven wear performance as compared with the conventional examples, and at all loads including 50% wear. It can be seen that the noise level is reduced.
As described above, it has become possible to provide a precure tread with reduced air column resonance sound caused by the circumferential groove and a retread tire using the same without impairing the steering stability performance and the uneven wear performance.

ヘルムホルツ共鳴器の模式図である。It is a schematic diagram of a Helmholtz resonator. プレキュアトレッドの一例である。It is an example of the flops of tread. プレキュアトレッドの一例である。It is an example of the flops of tread. プレキュアトレッドの一例である。It is an example of the flops of tread. プレキュアトレッドの背面図である。It is a rear view of the flops of tread. 共鳴器の気室部を示す図である。It is a figure which shows the air chamber part of a resonator. 従来例のプレキュアトレッドを示す図である。It is a figure which shows the precure tread of a prior art example. 比較例のプレキュアトレッドを示す図である。It is a figure which shows the precure tread of a comparative example. 参考例のプレキュアトレッドを示す図である。It is a figure which shows the precure tread of a reference example . 発明例２、３、５のプレキュアトレッドを示す図である。It is a figure which shows the precure tread of invention example 2,3,5. 発明例４のプレキュアトレッドを示す図である。It is a figure which shows the precure tread of the example 4 of an invention.

符号の説明Explanation of symbols

１ 管状部
２ 気室部
３ 共鳴器
１０ プレキュアトレッド
１１ 周方向溝
１１ａ、１１ｂ、１１ｃ、１１ｄ 周方向溝
１２ 背面溝
１３、１４ ラグ溝
１５ ゴム壁 DESCRIPTION OF SYMBOLS 1 Tubular part 2 Air chamber part 3 Resonator 10 Precure tread 11 Circumferential groove 11a, 11b, 11c, 11d Circumferential groove 12 Back surface groove 13, 14 Lug groove 15 Rubber wall

Claims (5)

タイヤの接地面側となる表面と台タイヤに貼り付ける側となる背面とを有するプレキュアトレッドにおいて、
前記表面にタイヤ周方向に沿って延びる少なくとも１本の周方向溝を有し、さらに、該周方向溝に連通するとともに前記プレキュアトレッドの厚み方向内側に設けた少なくとも１つの共鳴器を具え、
前記共鳴器が、前記周方向溝に一端が開口する管状部と、該管状部の他端に接続し、該管状部の断面積よりも大きな断面積を有する気室部とを具え、
前記気室部が、前記背面に開口し、トレッド部接地面の摩耗の進行に伴って該トレッド部接地面に露出する背面溝を区切ることで形成されることを特徴とするプレキュアトレッド。 In a precure tread having a surface that is a ground contact surface side of a tire and a back surface that is a side to be attached to a base tire,
It has at least one circumferential groove extending along the tire circumferential direction on the surface, and further includes at least one resonator that communicates with the circumferential groove and is provided on the inner side in the thickness direction of the precure tread ,
The resonator includes a tubular portion having one end opened in the circumferential groove, and an air chamber portion connected to the other end of the tubular portion and having a cross-sectional area larger than the cross-sectional area of the tubular portion,
Precured tread wherein the air chamber is open to the rear, is formed by separating the rear groove is exposed to the tread portion contact surface with the progress of the tread portion contact surface wear, characterized in Rukoto. 前記管状部が、前記周方向溝の溝底に開口することを特徴とする請求項１に記載のプレキュアトレッド。 The precure tread according to claim 1 , wherein the tubular portion opens at a groove bottom of the circumferential groove. 前記管状部が、吸音層を有することを特徴とする請求項１または２に記載のプレキュアトレッド。 Precured tread according to claim 1 or 2, wherein the tubular portion, and having a sound-absorbing layer. 前記共鳴器が複数であって、各共鳴器の共鳴周波数が異なることを特徴とする請求項１〜３のいずれかに記載のプレキュアトレッド。 The precure tread according to any one of claims 1 to 3 , wherein the resonator has a plurality of resonators, and each resonator has a different resonance frequency. 請求項１〜４のいずれかに記載のプレキュアトレッドを台タイヤに接着して用いることを特徴とする更生タイヤ。 A retread tire using the precure tread according to any one of claims 1 to 4 adhered to a base tire.
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