JP5790213B2 - Rehabilitated tire and manufacturing method thereof - Google Patents

Rehabilitated tire and manufacturing method thereof Download PDF

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JP5790213B2
JP5790213B2 JP2011148149A JP2011148149A JP5790213B2 JP 5790213 B2 JP5790213 B2 JP 5790213B2 JP 2011148149 A JP2011148149 A JP 2011148149A JP 2011148149 A JP2011148149 A JP 2011148149A JP 5790213 B2 JP5790213 B2 JP 5790213B2
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tread
tire
precure tread
precure
groove
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JP2013014215A (en
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毅 功刀
毅 功刀
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Yokohama Rubber Co Ltd
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Description

本発明は、更生タイヤ及びその製造方法に関し、更に詳しくは、更生タイヤにおけるユニフォミティ及び摩耗中期以降のウェット性能を向上すると共に、プレキュアトレッドを台タイヤに巻き付ける際の作業性を向上することを可能にした更生タイヤ及びその製造方法に関する。 The present invention relates to a further raw tire and a manufacturing method thereof, and more particularly, as well as improved uniformity and wear after the middle period of the wet performance in the retreaded tire, to improve the workability in winding the precured tread to the base tire possible further relates raw tire and a manufacturing method thereof in.

使用済みタイヤのトレッドを研削した台タイヤに、加硫ゴムの表面にパターンを形成したプレキュアトレッドを貼り付けて更生タイヤとして再使用することが行われている。このようなプレキュアトレッドでは、プレキュアトレッドと台タイヤとの接合面に対する加工が容易であるため、この接合面に溝やサイプを形成することで、摩耗中期以降に更生タイヤのトレッド表面に露出する隠し溝や隠しサイプを設け、これにより摩耗中期以降の低騒音化やウェット性能の向上を可能にする提案がなされている(特許文献1参照)。   A precure tread having a pattern formed on the surface of a vulcanized rubber is pasted on a base tire obtained by grinding a tread of a used tire and reused as a retread tire. In such a pre-cured tread, it is easy to process the joint surface between the pre-cured tread and the base tire. By forming grooves and sipes on this joint surface, it is exposed on the tread surface of the retread tire after the middle period of wear. There has been a proposal to provide a hidden groove and a hidden sipe, which can reduce noise and improve wet performance after the middle stage of wear (see Patent Document 1).

しかし、プレキュアトレッドの台タイヤとの接合面に溝を設けると、加硫時の加圧と加熱により、プレキュアトレッドと台タイヤとを接着するためのクッションゴムがこの溝内に流れ込み、溝近傍のクッションゴムが薄くなり、プレキュアトレッドと台タイヤとの接着を阻害され易くなるという問題がある。   However, if a groove is provided on the joint surface of the precure tread with the base tire, the cushion rubber for bonding the precure tread and the base tire flows into the groove due to pressure and heating during vulcanization, and the groove There is a problem that the nearby cushion rubber becomes thin, and adhesion between the precure tread and the base tire is likely to be hindered.

また、更生タイヤを製造するとき、板状のプレキュアトレッドを台タイヤの周方向に巻付けることで、プレキュアトレッドの外面と台タイヤとの接合面との間にプレキュアトレッドの厚さに起因する周長差が生じる。一方、台タイヤの研削面(バフ面)はタイヤ幅方向に対しても湾曲しているため、板状のプレキュアトレッドを巻き付けた際に、台タイヤのセンター部とショルダー部との径差に起因してプレキュアトレッドの幅方向にも周長差が生じる。これら周長差に因って、プレキュアトレッドを台タイヤに巻き付ける際にタイヤ幅方向両端部のプレキュアトレッドが大きく圧縮される為、作業性が悪化したり、それに伴ってトレッド部材の惰行等が発生し易くなる為、製造される更生タイヤのユニフォミティが損なわれ易くなるという問題がある。   In addition, when manufacturing retreaded tires, the thickness of the precure tread is reduced between the outer surface of the precure tread and the joint surface of the pedestal tire by winding a plate-shaped precure tread in the circumferential direction of the pedestal tire. The resulting circumference difference occurs. On the other hand, since the ground surface (buff surface) of the base tire is also curved in the tire width direction, when the plate-shaped pre-cured tread is wound, there is a difference in diameter between the center portion and the shoulder portion of the base tire. As a result, a circumferential length difference also occurs in the width direction of the precure tread. Due to these circumferential length differences, when the precure tread is wound around the base tire, the precure tread at both ends in the tire width direction is greatly compressed, so that the workability is deteriorated and the tread member is coasted accordingly. Therefore, there is a problem that the uniformity of the manufactured retreaded tire is easily impaired.

特開平08−104108号公報Japanese Patent Laid-Open No. 08-104108

本発明の目的は、上述する問題点を解決するもので、プレキュアトレッドと台タイヤとの接着性を阻害することなく更生タイヤの摩耗中期以降のウェット性能を向上し、かつ周長差に起因する圧縮を解消してプレキュアトレッドを台タイヤに巻き付ける際の作業性を向上すると共に、得られる更生タイヤのユニフォミティを改善することを可能にした更生タイヤ及びその製造方法に関する。 The object of the present invention is to solve the above-mentioned problems, improve wet performance after the middle stage of wear of the retread tire without impairing the adhesion between the precure tread and the base tire, and originate from the difference in circumference with eliminating the compression that by improving the workability in winding the precured tread to the base tire further relates raw tire and a manufacturing method thereof enabling to improve the uniformity of retreaded tires obtained.

上記目的を達成するための本発明の更生タイヤは、タイヤ周方向に延びる複数本の主溝を有するプレキュアトレッドと台タイヤとからなる更生タイヤにおいて、前記プレキュアトレッドの前記台タイヤとの接合面の少なくとも前記プレキュアトレッドの幅方向端部と前記プレキュアトレッドの幅方向最外側に配置された最外側主溝との間のショルダー部に前記プレキュアトレッドの幅方向に延びる切り欠き部を設け、該切り欠き部を前記幅方向端部と少なくとも前記最外側主溝とに開口させると共に、前記切り欠き部を前記プレキュアトレッドを前記台タイヤに巻き付けたときに前記プレキュアトレッド内部を貫通する孔として残る空間部と該空間部から前記接合面側に延び前記接合面に開口する開口部とから構成したプレキュアトレッドを接着層を介して台タイヤの外周面に接着して構成され、トレッド内部をタイヤ幅方向に貫通する孔を有し、前記プレキュアトレッドに設けた切り欠き部の開口部が閉じた状態にあることを特徴とする。 Retread tire of the present invention for achieving the above object, in a retread tire comprising a precured tread and the base tire to have a major groove of the plurality of extending in the tire circumferential direction, and said base tire of the precured tread A notch portion extending in the width direction of the precure tread at a shoulder portion between at least a width direction end portion of the precure tread and an outermost main groove disposed at the outermost width direction of the precure tread of the joint surface And opening the notch into the width direction end and at least the outermost main groove, and the notch is formed inside the precure tread when the precure tread is wound around the base tire. the flop Les tread which is composed of the opening portion that is opened in the bonding surface extending from the space portion and a space portion that remains as a hole passing through the junction surface Through the adhesive layer is configured to adhere to the outer peripheral surface of the base tire, having a hole therethrough tread in the tire width direction, in a state in which the opening of the notch portion provided in the precured tread is closed It is characterized by that.

また、上記目的を達成するための本発明の更生タイヤの製造方法は、タイヤ周方向に延びる複数本の主溝を有するプレキュアトレッドと台タイヤとからなる更生タイヤの製造方法において、前記プレキュアトレッドの前記台タイヤとの接合面の少なくとも前記プレキュアトレッドの幅方向端部と前記プレキュアトレッドの幅方向最外側に配置された最外側主溝との間のショルダー部に前記プレキュアトレッドの幅方向に延びる切り欠き部を設け、該切り欠き部を前記幅方向端部と少なくとも前記最外側主溝とに開口させると共に、前記切り欠き部を前記プレキュアトレッドを前記台タイヤに巻き付けたときに前記プレキュアトレッド内部を貫通する孔として残る空間部と該空間部から前記接合面側に延び前記接合面に開口する開口部とから構成したプレキュアトレッドを前記台タイヤの外周面に接着層を介して巻付け、該巻き付けたプレキュアトレッドの長手方向両端部を接合して環状にし、該環状のプレキュアトレッドを前記台タイヤの外周面に圧着することで、前記プレキュアトレッドに設けた切り欠き部の開口部を閉じてトレッド内部をタイヤ幅方向に貫通する孔を設けたことを特徴とする。 In addition , a method for producing a retread tire according to the present invention for achieving the above object is the method for producing a retread tire comprising a precure tread having a plurality of main grooves extending in the tire circumferential direction and a base tire, and the precure The precure tread is formed on a shoulder portion between at least a width direction end portion of the precure tread and a outermost main groove disposed on the outermost side in the width direction of the precure tread on a joint surface of the tread with the base tire. When providing a notch extending in the width direction, opening the notch in the width direction end and at least the outermost main groove, and winding the precure tread around the pedestal tire with the notch A space remaining as a hole penetrating the inside of the precure tread and an opening extending from the space toward the bonding surface and opening to the bonding surface. The winding via an adhesive layer on the outer circumferential surface of said platform tire precured tread, by joining the longitudinal ends of the precured tread wound the circularized, the outer periphery of said platform tire on the annularly-shaped precured tread It is characterized in that a hole penetrating the inside of the tread in the tire width direction is provided by crimping to the surface to close the opening of the notch provided in the precure tread.

プレキュアトレッドの台タイヤとの接合面の少なくともプレキュアトレッドの幅方向端部と最外側主溝との間のショルダー部にプレキュアトレッドの幅方向に延びる切り欠き部を設け、この切り欠き部を幅方向端部と少なくとも最外側主溝とに開口させると共に、切り欠き部をプレキュアトレッドを台タイヤに巻き付けたときにプレキュアトレッド内部を貫通する孔として残る空間部とこの空間部から接合面側に延び接合面に開口する開口部とから構成したので、空間部が更生タイヤにおいてトレッド内部をタイヤ幅方向に貫通する孔となり、主溝内の水がこの孔を通じてショルダー部から排水されるのでウェット性能を向上することが出来、更に、この孔は摩耗中期から終期にかけてトレッド表面に出現して溝又はサイプとして機能するので、摩耗中期以降におけるウェット性能も向上することが出来る。また、プレキュアトレッドを台タイヤに巻き付ける際に、開口部が閉じるように変形してプレキュアトレッドを容易に台タイヤの外周面の湾曲に沿った形状にすることが出来る。その結果、プレキュアトレッドを台タイヤに巻き付ける際の作業性を向上することが出来、かつ製造される更生タイヤのユニフォミティを改善することが出来る。   A cutout portion extending in the width direction of the precure tread is provided at the shoulder portion between at least the width direction end portion of the precure tread and the outermost main groove on the joint surface of the precure tread with the base tire. Is opened at the width direction end and at least the outermost main groove, and the notch is joined to the space remaining as a hole penetrating the inside of the precure tread when the precure tread is wound around the base tire. Since it is composed of an opening extending to the surface side and opening to the joint surface, the space portion becomes a hole penetrating the inside of the tread in the tire width direction in the retreaded tire, and water in the main groove is drained from the shoulder portion through this hole. Therefore, the wet performance can be improved, and furthermore, this hole appears on the tread surface from the middle to the end of wear and functions as a groove or sipe. , Wet performance in wear after the middle period can also be improved. Further, when the precure tread is wound around the base tire, the precure tread can be easily formed into a shape along the curve of the outer peripheral surface of the base tire by being deformed so that the opening is closed. As a result, workability when winding the precure tread around the base tire can be improved, and the uniformity of the manufactured retread tire can be improved.

本発明の更生タイヤ及びその製造方法においては、接合面における切り欠き部の最大幅w及び切り欠き部の個数nを、プレキュアトレッドを台タイヤに巻き付けた際にプレキュアトレッドの厚さTにより生じるプレキュアトレッドの外面と接合面との間の周長差α及び台タイヤのセンター部とショルダー部との径差dにより生じるプレキュアトレッドの幅方向中央部と幅方向端部との間の周長差βに対して、下記式を満たすように設定することが好ましい。
0.3×(α+β)≦w×n≦0.6×(α+β)
(但し、α=2T×π,β=2d×π)
In the retreaded tire and the manufacturing method thereof according to the present invention, the maximum width w of the notch portion and the number n of the notch portions on the joint surface are determined by the thickness T of the precure tread when the precure tread is wound around the base tire. The circumferential length difference α between the outer surface and the joining surface of the precured tread that occurs and the radial difference d between the center portion and the shoulder portion of the base tire between the widthwise central portion and the widthwise end portion of the precured tread. The circumference difference β is preferably set to satisfy the following formula.
0.3 × (α + β) ≦ w × n ≦ 0.6 × (α + β)
(However, α = 2T × π, β = 2d × π)

このように切り欠き部の最大幅w、切り欠き部の個数n、及び周長差α,βを設定することにより、プレキュアトレッドを台タイヤに巻き付ける際に、切り欠き部の開口部が閉じるので、接着層のゴムが切り欠き部内に入ることを防ぐことが出来、ウェット性能を高めると共にプレキュアトレッドと台タイヤとの接着性を向上することが出来る。また、このように設定することで、より容易にプレキュアトレッドを台タイヤの形状に沿わせることが出来るので、プレキュアトレッドを台タイヤに巻き付ける際の作業性を向上することが出来る。また、製造される更生タイヤにおいて、ユニフォミティを向上すると共に、切り欠き部の開口部を閉じてトレッドの剛性を維持することが出来る。   Thus, by setting the maximum width w of the notch, the number n of notches, and the circumferential length differences α and β, the opening of the notch is closed when the precure tread is wound around the base tire. Therefore, it can prevent that the rubber | gum of an contact bonding layer enters into a notch part, can improve wet performance, and can improve the adhesiveness of a precure tread and a base tire. Further, by setting in this way, the precure tread can be more easily conformed to the shape of the base tire, so that the workability when winding the precure tread around the base tire can be improved. Moreover, in the retread tire manufactured, while improving a uniformity, the opening part of a notch part can be closed and the rigidity of a tread can be maintained.

本発明の更生タイヤ及びその製造方法においては、両側の最外側主溝の間のセンター部に切り欠き部を設け、この切り欠き部が主溝に開口するようにすることが好ましい。これにより、トレッド全面に孔(空間部)が形成されるので、溝内の水をこの孔(空間部)を通じて排水することが出来、更に摩耗中期以降にこの孔(空間部)がセンター部表面に出現して溝又はサイプとして機能するのでウェット性能を向上することが出来る。また、プレキュアトレッドを台タイヤに巻き付ける際にプレキュアトレッドが全体的に湾曲し易くなるので作業性及び製造されたタイヤのユニフォミティを高めることが出来る。 In the retreaded tire and the manufacturing method thereof according to the present invention, it is preferable that a notch is provided in the center between the outermost main grooves on both sides, and the notch is opened to the main groove. As a result, a hole (space part) is formed on the entire surface of the tread, so that the water in the groove can be drained through the hole (space part). Appearing on the surface and function as a groove or sipe, so that the wet performance can be improved. Further, when the precure tread is wound around the base tire, the precure tread is easily bent as a whole, so that workability and uniformity of the manufactured tire can be improved.

本発明の更生タイヤ及びその製造方法においては、切り欠き部をプレキュアトレッドの長手方向に等間隔で配置し、この切り欠き部の間隔Dをプレキュアトレッドの長手方向長さLに対してL/100≦D≦L/30の関係にすることが好ましい。これにより、孔(空間部)がタイヤ全体に均等に設けられるのでタイヤ全周に亘ってウェット性能を向上することが出来る。また、プレキュアトレッドを台タイヤの外周面に沿って均等に湾曲させることが出来るので、製造される更生タイヤのユニフォミティを向上することが出来る。 In the retreaded tire and the manufacturing method thereof according to the present invention, the notch portions are arranged at equal intervals in the longitudinal direction of the precure tread, and the interval D of the notch portions is set to L with respect to the longitudinal length L of the precure tread. It is preferable to have a relationship of / 100 ≦ D ≦ L / 30. Thereby, since a hole (space part) is provided uniformly in the whole tire, wet performance can be improved over the tire perimeter. Moreover, since the precure tread can be evenly curved along the outer peripheral surface of the base tire, the uniformity of the manufactured retread tire can be improved.

本発明の更生タイヤ及びその製造方法においては、空間部のプレキュアトレッドの外面側の端部がプレキュアトレッドに設けた溝の最大溝深さの1/2よりも接合面側に位置し、空間部の接合面側の端部が溝の溝底より外面側に位置するようにすることが好ましい。これにより、摩耗中期以降に空間部がトレッド面に露出するようになるので、摩耗中期以降のウェット性能を向上することが出来る。 In the retreaded tire of the present invention and the manufacturing method thereof, the end portion on the outer surface side of the precure tread in the space portion is located on the joining surface side than 1/2 of the maximum groove depth of the groove provided in the precure tread, It is preferable that the end of the space portion on the bonding surface side be positioned on the outer surface side from the groove bottom. Thereby, since a space part comes to be exposed to a tread surface after the middle stage of wear, wet performance after the middle stage of wear can be improved.

本発明の更生タイヤ及びその製造方法においては、プレキュアトレッドの長手方向断面において切り欠き部がプレキュアトレッドの長手方向の振幅を持ちながらプレキュアトレッドの厚さ方向に延在することが好ましい。これにより、開口部が存在することにより陸部の剛性が低下することを回避することが出来る。 In the retread tire and the manufacturing method thereof of the present invention, it is preferable that the notch portion extends in the thickness direction of the precure tread while having a longitudinal amplitude of the precure tread in the longitudinal section of the precure tread. Thereby, it can avoid that the rigidity of a land part falls by having an opening part.

本発明の実施形態からなる更生タイヤを示す子午線断面図である。It is meridian sectional drawing which shows the retreaded tire which consists of embodiment of this invention. 本発明の実施形態からなるプレキュアトレッドの一部を示す斜視図である。It is a perspective view which shows a part of precure tread which consists of embodiment of this invention. 図2のプレキュアトレッドにおける切り欠き部の作用を説明するための図であり、(a)はプレキュアトレッドの巻き付け前の状態を示す断面図であり、(b)はプレキュアトレッドの巻き付け後の状態を示す断面図である。It is a figure for demonstrating the effect | action of the notch part in the precure tread of FIG. 2, (a) is sectional drawing which shows the state before winding of a precure tread, (b) is after winding of a precure tread. It is sectional drawing which shows this state. 本発明の他の実施形態からなるプレキュアトレッドの一部を示す斜視図である。It is a perspective view which shows a part of precure tread which consists of other embodiment of this invention. 本発明のプレキュアトレッドに形成される種々の切り欠き部の接合面における配置を示し、(a)〜(d)はそれぞれプレキュアトレッドの接合面の正面図である。The arrangement | positioning in the junction surface of the various notch parts formed in the precure tread of this invention is shown, (a)-(d) is a front view of the junction surface of a precure tread, respectively. 本発明のプレキュアトレッドに形成される種々の切り欠き部の縦断面形状を示し、(a)〜(b)はそれぞれプレキュアトレッドの要部断面図である。The longitudinal cross-sectional shape of the various notch parts formed in the precure tread of this invention is shown, (a)-(b) is principal part sectional drawing of a precure tread, respectively. 本発明のプレキュアトレッドに形成される種々の切り欠き部の横断面形状を示し、(a)〜(h)はそれぞれプレキュアトレッドの要部断面図である。The cross-sectional shape of the various notch parts formed in the precure tread of this invention is shown, (a)-(h) is principal part sectional drawing of a precure tread, respectively. 本発明のプレキュアトレッドに形成される種々の切り欠き部の横断面形状を示し、(a)〜(b)はそれぞれプレキュアトレッドの要部断面図である。The cross-sectional shape of the various notch parts formed in the precure tread of this invention is shown, (a)-(b) is principal part sectional drawing of a precure tread, respectively.

以下、本発明の構成について添付の図面を参照しながら詳細に説明する。   Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

図1は、本発明の実施形態からなるプレキュアトレッド1を用いた更生タイヤ30を示す。プレキュアトレッド1は、加硫したゴム板の外面2に溝部3などからなるパターンを形成したものであり、台タイヤ10のトレッド部11に接着層20を介して貼り付けられる。   FIG. 1 shows a retread tire 30 using a precure tread 1 according to an embodiment of the present invention. The precure tread 1 is formed by forming a pattern made of a groove portion 3 and the like on the outer surface 2 of a vulcanized rubber plate, and is attached to the tread portion 11 of the base tire 10 via an adhesive layer 20.

台タイヤ10としては、一般的なタイヤの外周面に対してバフ掛けを施したものであれば良い。例えば、図1に示すように、使用済みのタイヤの外周面に対してバフ掛けが施されて形成されるトレッド部11と、タイヤ幅方向両側に形成されるサイドウォール部12と、サイドウォール部12のタイヤ径方向内側に形成されるビード部13とを備えている。左右一対のビード部13,13間にはカーカス層14が装架されている。このカーカス層14は、タイヤ径方向に延びる複数本の補強コードを含み、各ビード部13に配置されたビードコア15の廻りにタイヤ内側から外側に巻き上げられている。また、トレッド部11におけるカーカス層14の外周側にはスチールコードからなる4層のベルト層16が層間でコードが互いに交差するように配置されている。台タイヤ10は、このように一般的なタイヤの外周面を処理したものであれば良いので、図1に示す態様に限定されない。   As the base tire 10, what is necessary is just to buff the outer peripheral surface of a general tire. For example, as shown in FIG. 1, a tread portion 11 formed by buffing the outer peripheral surface of a used tire, sidewall portions 12 formed on both sides in the tire width direction, and sidewall portions And 12 bead portions 13 formed on the inner side in the tire radial direction. A carcass layer 14 is mounted between the pair of left and right bead portions 13. The carcass layer 14 includes a plurality of reinforcing cords extending in the tire radial direction, and is wound around the bead core 15 disposed in each bead portion 13 from the tire inner side to the outer side. Further, four belt layers 16 made of steel cords are arranged on the outer peripheral side of the carcass layer 14 in the tread portion 11 so that the cords cross each other. The base tire 10 is not limited to the embodiment shown in FIG. 1 because it is sufficient to process the outer peripheral surface of a general tire in this way.

一方、プレキュアトレッド1は、図2に示すように、台タイヤ10との接合面4において、少なくともプレキュアトレッド1の幅方向端部とプレキュアトレッド1の幅方向最外側に配置された最外側主溝3oとの間のショルダー部S(構成タイヤ30におけるショルダー部)に、プレキュアトレッド1の幅方向(構成タイヤ30におけるタイヤ幅方向)に延びる切り欠き部5が形成されている。この切り欠き部5はプレキュアトレッド1の幅方向端部と少なくとも最外側主溝3oとに開口している。また、切り欠き部5は、プレキュアトレッド1を台タイヤ10に巻き付けたときにプレキュアトレッド1内部を貫通する孔5a’として残る空間部5aと、この空間部5aから接合面4側に延び接合面4に開口する開口部5bとから構成されている。   On the other hand, as shown in FIG. 2, the precure tread 1 is arranged at least at the end portion in the width direction of the precure tread 1 and the outermost width direction of the precure tread 1 on the joint surface 4 with the base tire 10. A notch portion 5 extending in the width direction of the precure tread 1 (the tire width direction in the constituent tire 30) is formed in the shoulder portion S (the shoulder portion in the constituent tire 30) between the outer main groove 3o. The notch 5 is open to the width direction end of the precure tread 1 and at least the outermost main groove 3o. Further, the cutout portion 5 extends to the joint surface 4 side from the space portion 5a remaining as a hole 5a 'penetrating the inside of the precure tread 1 when the precure tread 1 is wound around the base tire 10. It is comprised from the opening part 5b opened to the joint surface 4. As shown in FIG.

このように少なくともショルダー部Sに切り欠き部5を設けることで、切り欠き部5の空間部5aは更生タイヤ30において孔5a’として残存するので、主溝3内に残存する水を孔5a’を通じて排水することが可能になりウェット性能を向上することが出来る。更に、この孔5a’は、摩耗中期以降にトレッド面に露出して溝又はサイプとして機能するので、摩耗中期以降のウェット性能についても向上することが出来る。また、切り欠き部5の開口部5bは当初は開いているが(図3(a)参照)、プレキュアトレッド1を台タイヤ10に巻き付ける際に、この開口部5bが閉じるように変形し、プレキュアトレッド1が湾曲するので(図3(b)参照)、プレキュアトレッド1を台タイヤ10の形状に沿うように変形することが可能になる。その結果、接合面4側に切り欠き部5を設けても、加硫時の加圧と加熱によってプレキュアトレッド1と台タイヤ10とを接着するための接着層20のゴムがこの溝内に流れ込むことを抑制することが出来、プレキュアトレッド1と台タイヤ10との接着を高度に維持することが出来る。また、プレキュアトレッド1を台タイヤ10に巻き付ける際の作業性を向上することが出来、かつそれに伴うプレキュアトレッド1の惰行等を防止して、製造される更生タイヤ30のユニフォミティを向上することが出来る。   By providing the notch portion 5 at least in the shoulder portion S in this way, the space portion 5a of the notch portion 5 remains as the hole 5a ′ in the retread tire 30, so that the water remaining in the main groove 3 is removed from the hole 5a ′. It becomes possible to drain through, and wet performance can be improved. Further, since the hole 5a 'is exposed on the tread surface after the middle stage of wear and functions as a groove or sipe, the wet performance after the middle stage of wear can be improved. In addition, the opening 5b of the notch 5 is initially open (see FIG. 3A), but when the precure tread 1 is wound around the base tire 10, the opening 5b is deformed so as to be closed, Since the precure tread 1 is curved (see FIG. 3B), the precure tread 1 can be deformed so as to follow the shape of the base tire 10. As a result, even if the notch 5 is provided on the joint surface 4 side, the rubber of the adhesive layer 20 for bonding the precure tread 1 and the base tire 10 by pressure and heating during vulcanization is in this groove. The inflow can be suppressed, and the adhesion between the precure tread 1 and the base tire 10 can be maintained at a high level. In addition, workability when winding the precure tread 1 around the base tire 10 can be improved, and coasting of the precure tread 1 associated therewith can be prevented to improve the uniformity of the manufactured retread tire 30 I can do it.

プレキュアトレッド1を台タイヤ10に巻き付ける際、プレキュアトレッド1の厚さTに因って、プレキュアトレッド1の外面2と接合面4との間に周長差αが生じる。また、台タイヤ10のセンター部とショルダー部との径差dに因って、プレキュアトレッド1の幅方向中央部と幅方向端部との間に周長差βが生じる。そのため、切り欠き部5の接合面4における最大幅w及び個数nを、周長差α,βに対して、下記式を満たすように設定することが好ましい。
0.3×(α+β)≦w×n≦0.6×(α+β)
(但し、α=2T×π,β=2d×π)
When the precure tread 1 is wound around the base tire 10, due to the thickness T of the precure tread 1, a circumferential length difference α is generated between the outer surface 2 and the joining surface 4 of the precure tread 1. Further, due to the diameter difference d between the center portion and the shoulder portion of the base tire 10, a circumferential length difference β occurs between the width direction center portion and the width direction end portion of the precure tread 1. Therefore, it is preferable that the maximum width w and the number n of the notch portions 5 on the joint surface 4 are set so as to satisfy the following expression with respect to the circumferential length differences α and β.
0.3 × (α + β) ≦ w × n ≦ 0.6 × (α + β)
(However, α = 2T × π, β = 2d × π)

即ち、各切り欠き部5の最大幅wの総和(w×n)を周長差の和(α+β)の0.3〜0.6倍にすることが好ましい。各切り欠き部5の最大幅wの総和(w×n)が周長差の和(α+β)の0.3倍より小さいと、プレキュアトレッド1を台タイヤ10の外周面の湾曲に対して充分に変形させることが難しくなるため、プレキュアトレッド1を巻き付ける際の作業性が悪化し、また、製造される更生タイヤ30のユニフォミティが低下する。各切り欠き部5の最大幅wの総和(w×n)が周長差の和(α+β)の0.6倍より大きいと、製造される更生タイヤ30において切り欠き部5の開口部5bが完全に閉じずに隙間が残留するため、加硫時に接着層20のゴムがこの隙間に流れ込み、開口部5b近傍の接着層20が薄くなり、プレキュアトレッド1と台タイヤ10との接着性が低下する。   That is, it is preferable that the total sum (w × n) of the maximum width w of each notch portion 5 is 0.3 to 0.6 times the sum of the circumferential length differences (α + β). If the total sum (w × n) of the maximum widths w of the notches 5 is smaller than 0.3 times the sum of the circumferential lengths (α + β), the precure tread 1 is made against the curvature of the outer peripheral surface of the base tire 10. Since it becomes difficult to sufficiently deform, the workability when winding the precure tread 1 is deteriorated, and the uniformity of the manufactured retread tire 30 is lowered. When the sum (w × n) of the maximum widths w of the notches 5 is larger than 0.6 times the sum of the circumferential lengths (α + β), the openings 5b of the notches 5 in the retread tire 30 to be manufactured. Since the gap remains without being completely closed, the rubber of the adhesive layer 20 flows into the gap during vulcanization, the adhesive layer 20 near the opening 5b becomes thin, and the adhesiveness between the precure tread 1 and the base tire 10 is improved. descend.

切り欠き部5は、図2に示すように、少なくともショルダー部Sのみに設けるだけでなく、図4に示すように、両側の最外側主溝3o,3o間のセンター部Cに設けて、切り欠き部5がセンター部Cに位置する主溝3iに開口するようにしても良い。図2のようにショルダー部Sのみに切り欠き部5を設けた場合であっても、図4のようにショルダー部S及びセンター部C、即ちプレキュアトレッドの幅方向全体に切り欠き部5を設けた場合であっても、この孔5a’を通じて主溝3内の水を効率よく排水することが出来るのでウェット性能を向上することが出来、更に摩耗中期以降にこの孔5a’がトレッド面に露出して溝又はサイプとして機能することでウェット性能を向上することが出来る。特に、図4のようにショルダー部S及びセンター部Cに切り欠き部5を設けることで、センター部Cの主溝3i内の水も排水可能になり、かつ摩耗中期以降に溝又はサイプとしてトレッド表面に出現する孔5a’が増加するので、ウェット性能をより向上することが出来る。   As shown in FIG. 2, the notch portion 5 is provided not only in at least the shoulder portion S but also in the center portion C between the outermost main grooves 3o and 3o on both sides as shown in FIG. You may make it the notch part 5 open to the main groove 3i located in the center part C. FIG. Even when the notch 5 is provided only in the shoulder S as shown in FIG. 2, the notch 5 is provided in the entire width direction of the shoulder S and the center C, that is, the precure tread as shown in FIG. Even if it is provided, the water in the main groove 3 can be efficiently drained through the hole 5a ′, so that the wet performance can be improved. Further, the hole 5a ′ is formed on the tread surface after the middle period of wear. The wet performance can be improved by exposing and functioning as a groove or sipe. In particular, as shown in FIG. 4, the notch 5 is provided in the shoulder portion S and the center portion C, so that water in the main groove 3i of the center portion C can be drained and tread as a groove or sipe after the middle period of wear. Since the number of holes 5a 'appearing on the surface increases, the wet performance can be further improved.

また、ショルダー部Sがプレキュアトレッド1を台タイヤ10に巻き付ける際の湾曲が最も大きい箇所であるので、図2のように少なくともこの部位に切り欠き部5が設けられていれば、プレキュアトレッド1を台タイヤ10の形状に沿って変形し易くすることが出来るが、図4に示すようにショルダー部S及びセンター部C、即ちプレキュアトレッド1の幅方向全体に切り欠き部5を設けることでプレキュアトレッド1全体が変形し易くなるので、より台タイヤ10の形状に沿わせることが容易になり、作業性を高めることが出来る。   Further, since the shoulder portion S is a portion having the largest curvature when the precure tread 1 is wound around the base tire 10, if the notch portion 5 is provided at least in this portion as shown in FIG. 1 can be easily deformed along the shape of the base tire 10, but as shown in FIG. 4, the shoulder portion S and the center portion C, that is, the notch portion 5 is provided in the entire width direction of the precure tread 1. Therefore, since the entire precure tread 1 is easily deformed, it becomes easier to follow the shape of the base tire 10 and workability can be improved.

図2のように切り欠き部5をショルダー部Sに設ける場合、図5(a)のように左右両側の切り欠き部5同士は周方向に同じ位置に配置しても良いが、図5(b)のように左右両側の切り欠き部5同士が周方向にずれて配置されるようにしても良い。また、この場合、切り欠き部5は左右両側で配置する個数を同じにしても異ならせても良い。   When the cutout portion 5 is provided in the shoulder portion S as shown in FIG. 2, the cutout portions 5 on the left and right sides may be arranged at the same position in the circumferential direction as shown in FIG. As shown in b), the left and right cutouts 5 may be arranged so as to be shifted in the circumferential direction. In this case, the number of the notch portions 5 arranged on the left and right sides may be the same or different.

同様に、図4のように切り欠き部5をショルダー部S及びセンター部Cに設ける場合、図5(c)のようにプレキュアトレッド1の幅方向に連続的に延在する切り欠き部5を設けても良いが、図5(d)のようにプレキュアトレッド1の幅方向に不連続で主溝3を挟んで周方向にずれて配置するようにしても良い。この場合も、切り欠き部5はプレキュアトレッド1の幅方向端部と主溝3との間及び各主溝3の間に配置される個数を同じにしても異ならせても良い。   Similarly, when the notch portion 5 is provided in the shoulder portion S and the center portion C as shown in FIG. 4, the notch portion 5 extending continuously in the width direction of the precure tread 1 as shown in FIG. 5C. However, as shown in FIG. 5D, the precure tread 1 may be arranged discontinuously in the width direction and shifted in the circumferential direction with the main groove 3 interposed therebetween. Also in this case, the number of the cutout portions 5 may be the same or different between the end portions in the width direction of the precure tread 1 and the main grooves 3 and between the main grooves 3.

尚、図5(b),(d)に示すように、幅方向に連続しない複数列の切り欠き部5を設ける場合は、その各列の切り欠き部5の個数n’に基づき、各列における切り欠き部5の最大幅wの総和(w×n’)を周長差の和(α+β)の0.3〜0.6倍にすることが好ましい。   As shown in FIGS. 5B and 5D, when a plurality of rows of notch portions 5 that are not continuous in the width direction are provided, each row is based on the number n ′ of the notch portions 5 in each row. The total sum (w × n ′) of the maximum widths w of the notches 5 is preferably 0.3 to 0.6 times the sum of the circumferential length differences (α + β).

切り欠き部5は少なくとも1本設ければよいが、好ましくは、図3(a)に示すように、複数本をプレキュアトレッド1の長手方向に等間隔で配置し、配置する切り欠き部5の間隔Dを、プレキュアトレッド1の長手方向長さLに対してL/100≦D≦L/30の範囲に設定することが好ましい。これにより、孔5a’がタイヤ全体に均等に設けられるのでタイヤ全周に亘ってウェット性能を向上することが出来る。また、プレキュアトレッド1を台タイヤ10の外周面に沿って均等に湾曲させることが出来るので、製造される更生タイヤ30のユニフォミティを向上することが出来る。   At least one notch portion 5 may be provided. Preferably, as shown in FIG. 3A, a plurality of notch portions 5 are arranged at equal intervals in the longitudinal direction of the precure tread 1. Is preferably set in a range of L / 100 ≦ D ≦ L / 30 with respect to the longitudinal length L of the precure tread 1. As a result, the holes 5a 'are provided uniformly throughout the tire, so that the wet performance can be improved over the entire circumference of the tire. Moreover, since the precure tread 1 can be evenly curved along the outer peripheral surface of the base tire 10, the uniformity of the manufactured retread tire 30 can be improved.

空間部5aは切り欠き部5の終端であればどのように配置しても良いが、好ましくは、図6(a),(b)に示すように、空間部5aのプレキュアトレッド1の外面2側の端部がプレキュアトレッド1に設けた溝の最大溝深さDの1/2倍の位置よりも接合面4側に位置し、空間部5aの接合面4側の端部が溝底より外面2側に位置するようにすると良い。このように空間部5aを配置することで、摩耗中期以降に構成タイヤ30のトレッド面に露出し、溝又はサイプとして機能してウェット性能を向上することが出来る。空間部5aの外面2側の端部が溝の最大溝深さDの1/2倍の位置よりも外面2側に位置すると、溝面積が大きく減少していない摩耗初期に空間部5aがトレッド面に露出するためトレッド剛性が低下する。空間部5aの接合面4側の端部が溝底より接合面4側に位置すると、空間部5aが大きくなり過ぎるため耐久性が低下する。   The space 5a may be arranged in any way as long as it is the end of the notch 5, but preferably, as shown in FIGS. 6 (a) and 6 (b), the outer surface of the precure tread 1 in the space 5a. The end portion on the 2 side is located on the joining surface 4 side from a position that is 1/2 times the maximum groove depth D of the groove provided on the precure tread 1, and the end portion on the joining surface 4 side of the space portion 5a is the groove. It is preferable to be positioned on the outer surface 2 side from the bottom. By arranging the space portion 5a in this way, it is exposed to the tread surface of the constituent tire 30 after the middle period of wear, and functions as a groove or sipe, thereby improving the wet performance. If the end of the space portion 5a on the outer surface 2 side is located on the outer surface 2 side of the position that is 1/2 times the maximum groove depth D of the groove, the space portion 5a is treaded in the initial stage of wear when the groove area is not greatly reduced. Since it is exposed to the surface, the tread rigidity decreases. If the end portion of the space portion 5a on the bonding surface 4 side is positioned on the bonding surface 4 side from the groove bottom, the space portion 5a becomes too large and the durability is lowered.

切り欠き部5のプレキュアトレッドの長手方向における断面形状としては、例えば、図7(a)〜(c)に示すような空間部5aが円形のもの、図7(d)に示すような空間部5aが楕円形のもの、図7(e)に示すような空間部5aが四角形状のもの、図7(f)〜(h)に示すような空間部5aが三角形状のものなど、どのようなものであっても構わない。また、このような空間部5aに対して、開口部5bは、図7(a),(d)〜(g)に示すように、接合面4側から空間部5aまで一定の幅のもの、図7(b)に示すように、接合面4側から空間部5aに向かって徐々に幅が狭くなるものを適宜採用することが出来る。逆に、図7(c),(h)に示すように、空間部5aから接合面4側に向かって徐々に幅が狭くなるようにしても良い。更に、図7(h)のように、空間部5aの壁面と開口部5bの壁面とが段差を形成せずに滑らかに連続していても構わない。   As the cross-sectional shape in the longitudinal direction of the precure tread of the notch portion 5, for example, the space portion 5a as shown in FIGS. 7A to 7C is circular, and the space as shown in FIG. 7a, which has an elliptical shape, a space portion 5a having a square shape as shown in FIG. 7E, a space portion 5a having a triangular shape as shown in FIGS. You may be something like this. Further, with respect to such a space portion 5a, the opening portion 5b has a constant width from the joining surface 4 side to the space portion 5a, as shown in FIGS. 7 (a) and (d) to (g). As shown in FIG. 7B, it is possible to appropriately employ a material whose width gradually decreases from the joint surface 4 side toward the space portion 5a. Conversely, as shown in FIGS. 7C and 7H, the width may be gradually reduced from the space 5a toward the bonding surface 4 side. Further, as shown in FIG. 7H, the wall surface of the space 5a and the wall surface of the opening 5b may be smoothly continuous without forming a step.

いずれの場合であっても、加硫時に接着層20のゴムが切り欠き部5内に流入することを防ぐことが出来るが、図7(b)に示すように、開口部5bの幅が接合面4側から空間部5a側に向かって徐々に狭くなるものであれば、プレキュアトレッド1を台タイヤ10に巻き付ける際に、効率よく切り欠き部5を閉じることが出来る為より好ましい。   In any case, it is possible to prevent the rubber of the adhesive layer 20 from flowing into the notch 5 during vulcanization, but the width of the opening 5b is bonded as shown in FIG. It is more preferable that the width gradually decreases from the surface 4 side toward the space portion 5a side because the cutout portion 5 can be efficiently closed when the precure tread 1 is wound around the base tire 10.

また、開口部5bは、図8(a),(b)に示すようにプレキュアトレッド1の長手方向断面においてプレキュアトレッド1の長手方向の振幅を有してプレキュアトレッド1の厚さ方向に延在することが好ましい。具体的には、図8(a)に示すようなジグザグ状や、図8(b)に示すような波状とすることが出来る。このように構成することで、開口部5bが存在することによりトレッド剛性が低下することを回避することが出来る。   Further, the opening 5b has an amplitude in the longitudinal direction of the precure tread 1 in the longitudinal cross section of the precure tread 1, as shown in FIGS. It is preferable to extend to. Specifically, a zigzag shape as shown in FIG. 8A or a wave shape as shown in FIG. By comprising in this way, it can avoid that tread rigidity falls by the presence of the opening part 5b.

本発明の更生タイヤ30は、上述のプレキュアトレッド1を図1に示すように接着層20を介して台タイヤ10の外周面に接着して構成され、トレッド内部をタイヤ幅方向に貫通する孔5a’を有するものであれば、どのようなものであっても構わない。   The retread tire 30 of the present invention is configured by adhering the above-mentioned precure tread 1 to the outer peripheral surface of the base tire 10 via the adhesive layer 20 as shown in FIG. 1, and a hole penetrating the inside of the tread in the tire width direction. Any material having 5a 'may be used.

更生タイヤ30において、上述のプレキュアトレッド1を用いることでプレキュアトレッド1を台タイヤ10に巻き付ける際に切り欠き部5の開口部5bは閉じるので、加硫時に接着層2のゴムが切り欠き部5内に流入することを避けることが出来る。   In the retreaded tire 30, when the precure tread 1 is used to wind the precure tread 1 around the base tire 10, the opening 5 b of the notch 5 is closed, so that the rubber of the adhesive layer 2 is notched during vulcanization. Inflow into the part 5 can be avoided.

本発明の更生タイヤ30は、一般的な更生タイヤ30の製造方法において、上述の本発明のプレキュアトレッド1を使用することで製造される。具体的には、例えば、以下のようにして製造することが出来る。まず、使用済みタイヤに対してトレッドの外表面を削り取るバフ加工が施される。更に、バフ表面(外周面)に1次走行中に受けた損傷が残っている場合には、損傷個所を部分的に剥ぎ取るスカイビング及び穴埋めが行われ、台タイヤ10が形成される。次いで、この台タイヤ10の外周面に未加硫ゴムからなる接着層20を塗布する。そして、台タイヤ10の外周面にプレキュアトレッド1を巻き付け、巻き付けたプレキュアトレッド1の長手方向両端部を接合して環状にし、環状のプレキュアトレッド1を台タイヤ10の外周面に圧着する。この後、プレキュアトレッド1が圧着された台タイヤ10は加硫工程に供され、接着層20が加硫されて更生タイヤ30となる。   The retread tire 30 of the present invention is manufactured by using the precure tread 1 of the present invention described above in a general method for manufacturing a retread tire 30. Specifically, for example, it can be produced as follows. First, the used tire is buffed to scrape the outer surface of the tread. Further, when the damage received during the primary running remains on the buff surface (outer peripheral surface), skiving and hole filling for partially peeling the damaged portion are performed, and the base tire 10 is formed. Next, an adhesive layer 20 made of unvulcanized rubber is applied to the outer peripheral surface of the base tire 10. And the precure tread 1 is wound around the outer peripheral surface of the base tire 10, both ends in the longitudinal direction of the wound precure tread 1 are joined to form an annular shape, and the annular precure tread 1 is pressure-bonded to the outer peripheral surface of the base tire 10. . Thereafter, the base tire 10 to which the precure tread 1 is pressure-bonded is subjected to a vulcanization process, and the adhesive layer 20 is vulcanized to become a retread tire 30.

このとき、本発明のプレキュアトレッド1は、上述のように切り欠き部5として製造される更生タイヤ30において孔5a’として残る空間部5aと巻き付け時に閉じる開口部5bとから構成されているので、上記製造工程において接着層20のゴムが切り欠き部5内に流入することが防止できると共に、プレキュアトレッド1の台タイヤ10への巻き付けが容易になり作業性を向上することが出来る。   At this time, the precure tread 1 of the present invention is composed of the space portion 5a remaining as the hole 5a ′ in the retread tire 30 manufactured as the notch portion 5 as described above and the opening portion 5b that is closed when wound. In addition, it is possible to prevent the rubber of the adhesive layer 20 from flowing into the notch 5 in the above manufacturing process, and it is easy to wind the precure tread 1 around the base tire 10 and to improve workability.

タイヤサイズが11R22.5である空気入りタイヤの外表面に対してバフ掛けを施して製造した台タイヤに対して、接着層を介してプレキュアトレッドを圧着し、加硫して得た更生タイヤにおいて、プレキュアトレッドの仕様として、切り欠き部の有無、切り欠き部の長手方向断面形状、切り欠き部の配置、開口部の長手方向断面形状、溝底から1/2Dの位置に対する空間部上端の位置、溝底に対する空間部下端の位置、プレキュアトレッドの厚さT、台タイヤの径差d、周長差の和α+β、切り欠き部の最大幅w及び個数n、その積である切り欠き部の総幅w×n、切り欠き部の間隔Dを表1,2のように異ならせた従来例1、比較例1及び実施例1〜11の13種類の試験タイヤを製作した。尚、従来例1は切り欠き部を有さないタイヤであり、比較例1は空間部を有さず長手方向幅が一定の切り欠き部を幅方向全域に有するタイヤである。   Rehabilitated tire obtained by pressure bonding a precure tread through an adhesive layer and vulcanizing to a base tire manufactured by buffing the outer surface of a pneumatic tire having a tire size of 11R22.5 The specifications of the precure tread include the presence or absence of a notch, the longitudinal cross-sectional shape of the notch, the arrangement of the notch, the longitudinal cross-sectional shape of the opening, and the upper end of the space with respect to the position 1 / 2D from the groove bottom , The position of the lower end of the space with respect to the groove bottom, the thickness T of the precure tread, the diameter difference d of the base tire, the sum α + β of the circumferential length difference, the maximum width w and the number n of the notches, and the cut Thirteen types of test tires of Conventional Example 1, Comparative Example 1 and Examples 1 to 11 in which the total width w × n of the notch portions and the interval D of the notch portions were changed as shown in Tables 1 and 2 were manufactured. Conventional Example 1 is a tire that does not have a notch, and Comparative Example 1 is a tire that does not have a space and has a notch having a constant longitudinal width in the entire width direction.

これら13種類の試験タイヤについて、下記の評価方法により摩耗中期以降のウェット性能、プレキュアトレッドと台タイヤとの接着性、作業性及びユニフォミティを評価し、その結果を表1,2に併せて示した。   For these 13 types of test tires, wet performance after the middle period of wear, adhesion between precure tread and base tire, workability and uniformity were evaluated by the following evaluation methods, and the results are also shown in Tables 1 and 2. It was.

摩耗中期以降のウェット性能
各試験タイヤについて、70%摩耗時のタイヤを22.5×7.50のリムに装着し、空気圧700kPaを充填した後、大型車(2−D・4)に装着して散水したアスファルト路面を速度60km/hで走行している状態からブレーキ(フル制動)を付与し、停止するまでの制動距離を測定し、ウェット性能として評価した。得られた結果は従来例1を100とする指数値で示した。この指数値が大きい程、ウェット性能が優れることを意味する。
Wet performance after the middle wear period For each test tire, a 70% worn tire was mounted on a 22.5 × 7.50 rim, filled with air pressure 700 kPa, and then mounted on a large vehicle (2-D / 4). Brake (full braking) was applied from the state where the asphalt road surface sprinkled with water was run at a speed of 60 km / h, and the braking distance until stopping was measured and evaluated as wet performance. The obtained results are indicated by an index value in which Conventional Example 1 is 100. It means that wet performance is excellent, so that this index value is large.

プレキュアトレッドと台タイヤとの接着性
各試験タイヤについて、プレキュアトレッドと台タイヤとを互いに逆方向(180°)に引っ張ったときの剥離力を測定し、プレキュアトレッドと台タイヤとの接着性として評価した。得られた結果は従来例1の値を100とする指数値で表わした。この指数値が大きい程、接着性が優れることを意味する。
Adhesion between precure tread and pedestal tire For each test tire, the peel force when the precure tread and pedestal tire were pulled in opposite directions (180 °) was measured to bond the precure tread to the pedestal tire. Assessed as sex. The obtained result was expressed as an index value with the value of Conventional Example 1 being 100. It means that adhesiveness is excellent, so that this index value is large.

作業性
各試験タイヤについて、プレキュアトレッドを台タイヤに対して巻き付ける際の巻き始めから巻き終わりまでの所要時間を測定し、作業性として評価した。評価結果は従来例1の値の逆数を100とする指数値で表わした。この指数値が大きい程、所要時間が短く、作業性が優れることを意味する。
Workability For each test tire, the time required from winding start to winding end when winding the precure tread around the base tire was measured and evaluated as workability. The evaluation result was expressed as an index value with the reciprocal of the value of Conventional Example 1 being 100. The larger the index value, the shorter the required time and the better the workability.

ユニフォミティ
各試験タイヤのラジアルフォースバリエーション(RFV)を測定し、ユニフォミティとして評価した。評価結果は従来例1の値の逆数を100とする指数値で表わした。この指数値が大きい程、RFVが小さく、ユニフォミティが優れていることを意味する。
Uniformity The radial force variation (RFV) of each test tire was measured and evaluated as uniformity. The evaluation result was expressed as an index value with the reciprocal of the value of Conventional Example 1 being 100. The larger the index value, the smaller the RFV and the better the uniformity.

Figure 0005790213
Figure 0005790213

Figure 0005790213
Figure 0005790213

表1,2から判るように、実施例1〜11はいずれも切り欠き部を有さない従来例1、空間部を持たない切り欠き部を有する比較例1に対して、摩耗中期以降のウェット性能、プレキュアトレッドと台タイヤとの接着性、台タイヤにプレキュアトレッドを巻き付ける際の作業性、及び製造された更生タイヤのユニフォミティを向上した。   As can be seen from Tables 1 and 2, each of Examples 1 to 11 is wet after the middle stage of wear compared to Conventional Example 1 having no notch and Comparative Example 1 having a notch having no space. Performance, adhesion between the precure tread and the base tire, workability when winding the precure tread around the base tire, and uniformity of the manufactured retreaded tire have been improved.

1 プレキュアトレッド
2 外面
3 溝部
4 接合面
5 切り欠き部
5a 空間部
5b 開口部
5a’孔
10 台タイヤ
20 接着層
30 更生タイヤ
DESCRIPTION OF SYMBOLS 1 Precured tread 2 Outer surface 3 Groove part 4 Joint surface 5 Notch part 5a Space part 5b Opening part 5a 'hole 10 stand tire 20 Adhesive layer 30 Rehabilitation tire

Claims (12)

タイヤ周方向に延びる複数本の主溝を有するプレキュアトレッドと台タイヤとからなる更生タイヤにおいて、
前記プレキュアトレッドの前記台タイヤとの接合面の少なくとも前記プレキュアトレッドの幅方向端部と前記プレキュアトレッドの幅方向最外側に配置された最外側主溝との間のショルダー部に前記プレキュアトレッドの幅方向に延びる切り欠き部を設け、該切り欠き部を前記幅方向端部と少なくとも前記最外側主溝とに開口させると共に、前記切り欠き部を前記プレキュアトレッドを前記台タイヤに巻き付けたときに前記プレキュアトレッド内部を貫通する孔として残る空間部と該空間部から前記接合面側に延び前記接合面に開口する開口部とから構成したプレキュアトレッドを接着層を介して台タイヤの外周面に接着して構成され、トレッド内部をタイヤ幅方向に貫通する孔を有し、前記プレキュアトレッドに設けた切り欠き部の開口部が閉じた状態にあることを特徴とする更生タイヤ
In retread tire comprising a precured tread and the base tire to have a major groove of the plurality of extending in the tire circumferential direction,
The pre-cured tread has a shoulder portion between at least a width direction end portion of the pre-cured tread and an outermost main groove disposed on the outermost side in the width direction of the pre-cured tread. A cutout portion extending in the width direction of the cure tread is provided, the cutout portion is opened in the widthwise end portion and at least the outermost main groove, and the cutout portion is used as the pre-tired tread on the base tire. through an adhesive layer flop Les tread which is composed of the opening portion that is opened in the bonding surface extending in the joint surface from the space and a space portion that remains as a hole penetrating the interior of the precured tread when wound An opening of a notch portion provided in the precure tread, having a hole that penetrates the inside of the tread in the tire width direction. Retread tire, characterized in that in the closed state.
前記接合面における前記切り欠き部の最大幅w及び前記切り欠き部の個数nを、前記プレキュアトレッドを前記台タイヤに巻き付けた際に前記プレキュアトレッドの厚さTにより生じる前記プレキュアトレッドの外面と前記接合面との間の周長差α及び前記台タイヤのセンター部とショルダー部との径差dにより生じる前記プレキュアトレッドの幅方向中央部と幅方向端部との間の周長差βに対して、下記式を満たすように設定したことを特徴とする請求項1に記載の更生タイヤ
0.3×(α+β)≦w×n≦0.6×(α+β)
(但し、α=2T×π,β=2d×π)
The maximum width w and the number n of the notch of the notch in the joint surface, wherein the precured tread thickness of the precured tread produced by T the precured tread when wound on said platform tire The circumferential length between the widthwise center portion and the widthwise end portion of the precure tread caused by the circumferential length difference α between the outer surface and the joint surface and the diameter difference d between the center portion and the shoulder portion of the base tire. The retreaded tire according to claim 1, wherein the tire is set to satisfy the following formula with respect to the difference β.
0.3 × (α + β) ≦ w × n ≦ 0.6 × (α + β)
(However, α = 2T × π, β = 2d × π)
両側の前記最外側主溝の間のセンター部に前記切り欠き部を設け、該切り欠き部が前記主溝に開口するようにしたことを特徴とする請求項1又は2に記載の更生タイヤThe rehabilitated tire according to claim 1 or 2, wherein the notched portion is provided in a center portion between the outermost main grooves on both sides, and the notched portion is opened to the main groove. 前記切り欠き部を前記プレキュアトレッドの長手方向に等間隔で配置し、該切り欠き部の間隔Dを前記プレキュアトレッドの長手方向長さLに対してL/100≦D≦L/30の関係にしたことを特徴とする請求項1,2又は3に記載の更生タイヤThe notch portions are arranged at equal intervals in the longitudinal direction of the precure tread, and the interval D of the notch portions is L / 100 ≦ D ≦ L / 30 with respect to the longitudinal length L of the precure tread. The retreaded tire according to claim 1, 2 or 3, wherein 前記空間部の前記プレキュアトレッドの外面側の端部が前記プレキュアトレッドに設けた溝の最大溝深さの1/2よりも前記接合面側に位置し、前記空間部の前記接合面側の端部が前記溝の溝底より前記外面側に位置するようにしたことを特徴とする請求項1〜4のいずれかに記載の更生タイヤAn end portion of the space portion on the outer surface side of the precure tread is located on the bonding surface side with respect to a half of the maximum groove depth of the groove provided in the precure tread, and the space portion is on the bonding surface side. The rehabilitated tire according to any one of claims 1 to 4, wherein an end portion of the groove is positioned on the outer surface side from a groove bottom of the groove. 前記プレキュアトレッドの長手方向断面において前記切り欠き部が前記プレキュアトレッドの長手方向の振幅を持ちながら前記プレキュアトレッドの厚さ方向に延在することを特徴とする請求項1〜5のいずれかに記載の更生タイヤThe cutout portion extends in the thickness direction of the precure tread while having a longitudinal amplitude of the precure tread in a longitudinal section of the precure tread. Rehabilitation tire according to crab. タイヤ周方向に延びる複数本の主溝を有するプレキュアトレッドと台タイヤとからなる更生タイヤの製造方法において、
前記プレキュアトレッドの前記台タイヤとの接合面の少なくとも前記プレキュアトレッドの幅方向端部と前記プレキュアトレッドの幅方向最外側に配置された最外側主溝との間のショルダー部に前記プレキュアトレッドの幅方向に延びる切り欠き部を設け、該切り欠き部を前記幅方向端部と少なくとも前記最外側主溝とに開口させると共に、前記切り欠き部を前記プレキュアトレッドを前記台タイヤに巻き付けたときに前記プレキュアトレッド内部を貫通する孔として残る空間部と該空間部から前記接合面側に延び前記接合面に開口する開口部とから構成したプレキュアトレッドを前記台タイヤの外周面に接着層を介して巻付け、該巻き付けたプレキュアトレッドの長手方向両端部を接合して環状にし、該環状のプレキュアトレッドを前記台タイヤの外周面に圧着することで、前記プレキュアトレッドに設けた切り欠き部の開口部を閉じてトレッド内部をタイヤ幅方向に貫通する孔を設けたことを特徴とする更生タイヤの製造方法。
In a method for manufacturing a retread tire comprising a precure tread having a plurality of main grooves extending in the tire circumferential direction and a base tire,
The pre-cured tread has a shoulder portion between at least a width direction end portion of the pre-cured tread and an outermost main groove disposed on the outermost side in the width direction of the pre-cured tread. A cutout portion extending in the width direction of the cure tread is provided, the cutout portion is opened in the widthwise end portion and at least the outermost main groove, and the cutout portion is used as the pre-tired tread on the base tire. the outer peripheral surface of said platform tire precured tread which is composed of said precured tread space remains as interior through holes and openings from the space portion opened to the joining surface extending in the joining surface side when wound said platform with wound through an adhesive layer, and joining the longitudinal ends of the precured tread wound said to cyclic, ring-shaped precured tread By crimping the outer peripheral surface of the tire manufacturing method of the retreaded tire, characterized in that a hole penetrating the inner tread to the tire widthwise direction to close the opening of the notch portion provided in the precured tread.
前記接合面における前記切り欠き部の最大幅w及び前記切り欠き部の個数nを、前記プレキュアトレッドを前記台タイヤに巻き付けた際に前記プレキュアトレッドの厚さTにより生じる前記プレキュアトレッドの外面と前記接合面との間の周長差α及び前記台タイヤのセンター部とショルダー部との径差dにより生じる前記プレキュアトレッドの幅方向中央部と幅方向端部との間の周長差βに対して、下記式を満たすように設定したことを特徴とする請求項7に記載の更生タイヤの製造方法。The maximum width w of the cutout portion and the number n of the cutout portions on the joint surface are determined by the thickness T of the precure tread when the precure tread is wound around the base tire. The circumferential length between the widthwise center portion and the widthwise end portion of the precure tread caused by the circumferential length difference α between the outer surface and the joint surface and the diameter difference d between the center portion and the shoulder portion of the base tire. The method for producing a retread tire according to claim 7, wherein the difference β is set to satisfy the following formula.
0.3×(α+β)≦w×n≦0.6×(α+β)0.3 × (α + β) ≦ w × n ≦ 0.6 × (α + β)
(但し、α=2T×π,β=2d×π)(However, α = 2T × π, β = 2d × π)
両側の前記最外側主溝の間のセンター部に前記切り欠き部を設け、該切り欠き部が前記主溝に開口するようにしたことを特徴とする請求項7又は8に記載の更生タイヤの製造方法。The rehabilitated tire according to claim 7 or 8, wherein the notched portion is provided in a center portion between the outermost main grooves on both sides, and the notched portion is opened to the main groove. Production method. 前記切り欠き部を前記プレキュアトレッドの長手方向に等間隔で配置し、該切り欠き部の間隔Dを前記プレキュアトレッドの長手方向長さLに対してL/100≦D≦L/30の関係にしたことを特徴とする請求項7,8又は9に記載の更生タイヤの製造方法。The notch portions are arranged at equal intervals in the longitudinal direction of the precure tread, and the interval D of the notch portions is L / 100 ≦ D ≦ L / 30 with respect to the longitudinal length L of the precure tread. The method for producing a retread tire according to claim 7, 8 or 9, wherein the relationship is established. 前記空間部の前記プレキュアトレッドの外面側の端部が前記プレキュアトレッドに設けた溝の最大溝深さの1/2よりも前記接合面側に位置し、前記空間部の前記接合面側の端部が前記溝の溝底より前記外面側に位置するようにしたことを特徴とする請求項7〜10のいずれかに記載の更生タイヤの製造方法。An end portion of the space portion on the outer surface side of the precure tread is located on the bonding surface side with respect to a half of the maximum groove depth of the groove provided in the precure tread, and the space portion is on the bonding surface side. The method for manufacturing a retread tire according to any one of claims 7 to 10, wherein an end portion of the groove is positioned on the outer surface side from a groove bottom of the groove. 前記プレキュアトレッドの長手方向断面において前記切り欠き部が前記プレキュアトレッドの長手方向の振幅を持ちながら前記プレキュアトレッドの厚さ方向に延在することを特徴とする請求項7〜11のいずれかに記載の更生タイヤの製造方法 The cutout portion extends in a thickness direction of the precure tread while having a longitudinal amplitude of the precure tread in a longitudinal section of the precure tread. The manufacturing method of the retreaded tire of crab .
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