JP2004276536A - Method for manufacturing retreaded tire, and retreaded tire - Google Patents

Method for manufacturing retreaded tire, and retreaded tire Download PDF

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Publication number
JP2004276536A
JP2004276536A JP2003074494A JP2003074494A JP2004276536A JP 2004276536 A JP2004276536 A JP 2004276536A JP 2003074494 A JP2003074494 A JP 2003074494A JP 2003074494 A JP2003074494 A JP 2003074494A JP 2004276536 A JP2004276536 A JP 2004276536A
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JP
Japan
Prior art keywords
tire
retreaded
rim
retreaded tire
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003074494A
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Japanese (ja)
Inventor
Kazuo Teramoto
一雄 寺元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP2003074494A priority Critical patent/JP2004276536A/en
Publication of JP2004276536A publication Critical patent/JP2004276536A/en
Pending legal-status Critical Current

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  • Tires In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Tyre Moulding (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a retreaded tire with improved air fillability and the retreaded tire produced by the method. <P>SOLUTION: The retreaded tire is produced by disposing a rubber for tread on the tread part of a platform tire 3, inserting the platform tire 3 into a retreading mold 1 and then curing by heating. The tire is mounted on a 15° tapered rim. The bead heel interval W of the retreading mold 1 is set to be 1.15-1.40 time the width of the rim used. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、更生タイヤの製造方法および更生タイヤに関し、さらに詳しくは、エア充填性を改善した更生タイヤの製造方法および更生タイヤに関する。
【0002】
【従来の技術】
一般に、更生タイヤは、空気入りタイヤのトレッドの残溝が寿命に達すると、そのトレッド面を切削、バフ掛けし、その残されたタイヤ本体を台タイヤとして、再び新しいトレッド用ゴムをそれに貼り付けることにより、製造されている(例えば、特許文献1参照)。
【0003】
しかし、台タイヤの左右のビード間隔が、走行時の熱等の影響によって使用リム幅よりも狭く変形してしまい、チューブレスタイヤの場合には得られた更生タイヤをリムに嵌合させる際に、更生タイヤのビード部がリムに密着しにくくなって、エア充填性が悪化してしまうという問題があった。エア充填性が悪化した更生タイヤについては、吸引手段でタイヤビード部両側から負圧を掛けて、強制的にリムに押し付けるインフレーターという装置が必要となったり、このインフレーターを用いても、リムに嵌合させることができない場合もあった。
【0004】
【特許文献1】
特開平9−239865号公報
【0005】
【発明が解決しようとする課題】
従って、本発明の課題は、エア充填性を改善した更生タイヤの製造方法および更生タイヤを提供することにある。
【0006】
【課題を解決するための手段】
本発明によれば、台タイヤのトレッド部にトレッド用ゴムを配置し、この台タイヤを更生金型に挿入し加熱加硫して製造される15°テーパーリムに装着される更生タイヤの製造方法において、前記更生金型のビードヒール間隔が使用リム幅の1.15〜1.40倍である更生タイヤの製造方法が提供される。
【0007】
また、本発明によれば、台タイヤのトレッド部にトレッド用ゴムを配置し、この台タイヤを更生金型に挿入し加熱加硫して製造される15°テーパーリムに装着される更生タイヤにおいて、前記更生金型のビードヒール間隔が使用リム幅の1.15〜1.40倍である更生タイヤが提供される。
【0008】
【発明の実施の形態】
以下、本発明の構成について図面を参照しながら詳細に説明する。図1は、台タイヤ、更生タイヤとその更生金型のビード部付近の位置関係を示した子午線方向部分断面図である。本発明では、更生金型1の左右のビードヒール点P同士の距離であるビードヒール間隔Wを、製造される更生タイヤ2の使用リム幅(リムのビードヒール点同士の距離)の1.15〜1.40倍とする。すなわち、加硫前の台タイヤ3は、上述したように左右のビード間隔が狭くなっているが、これを使用リム幅よりも広げた状態で更生金型1に挿入し、加熱加硫することによって、更生タイヤ2のビードヒール間隔Wk(ビードヒール点Pk同士の距離)が、台タイヤ3のビードヒール間隔Wd(ビードヒール点Pd同士の距離)よりも広くなる。すると、更生タイヤ2をリムへ嵌合させると、ビードヒール間隔Wkが十分に広がっているので、更生タイヤ2がリムによく密着し、エア充填性が改善される。
【0009】
本発明の更生金型1のビードヒール間隔Wは、使用リム幅の1.15〜1.40倍、好ましくは1.20〜1.35倍であるが、この値が小さすぎると十分なエア充填性の改善効果が得られず、逆に大きすぎると台タイヤ3に対する変形量が大きくなりすぎて、台タイヤ3の変形が更生金型1のプロファイルに追従できずにサイドトレッド部のライト故障(表面ゴム流れ不良)やカーカス折れ等の製造故障の原因となってしまう。また、この値は、一般的に使用されている15°テーパーリム、すなわちJATMAやJISなどに15°深底リムとして、リムベースのタイヤ軸方向に対するテーパ角が15°のリムに装着される更生タイヤに適用可能である。
【0010】
台タイヤのトレッド部に配置するトレッド用ゴムとしては、未加硫のリトレッドゴムでもよいし、表面にトレッドパターンを設けた更生用プレキュアトレッドであってもよい。
【0011】
使用リムとは、更生タイヤを嵌合させて使用するリムであるが、例えば、JATMA2002年版記載の標準リム、及び適用リムの中で最もリム幅の狭いものであればよい。
【0012】
【実施例】
以下、実施例によって本発明をさらに説明するが、本発明の範囲をこれらの実施例に限定するものではない。
実施例1〜4及び比較例1〜4
下記表1に示すように、台タイヤ、更生タイヤ、更生金型の各ビードヒール間隔Wd、Wk、W、および、(更生金型のビードヒール間隔)/(使用リム幅)の比を異ならせてタイヤサイズ11R22.5の重荷重用空気入り更生タイヤを製造した。得られた各更生タイヤについて、以下の各評価を行った。
【0013】
エア充填性
リム幅7.5インチのリム(JATMA2002年版記載の許容リム)に更生タイヤを嵌合させ、インフレーターを用いずにエア充填ができたものを○、エア充填不可であったものを×とした。
【0014】
製造故障の有無
製造された更生タイヤについて、サイドトレッド部のライト故障(表面ゴム流れ不良)やカーカス折れ等の加硫故障の有無を観察した。
【0015】
【表1】

Figure 2004276536
【0016】
上記表1に示すように、更生金型のビードヒール間隔を使用リム幅の1.15〜1.40倍に設定した実施例1〜4は、更生タイヤの製造故障もなく、エア充填性を改善することができるという良好な結果が得られた。
【0017】
【発明の効果】
本発明に従って、更生金型のビードヒール間隔を使用リム幅の1.15〜1.40倍とすることによって、エア充填性を改善した更生タイヤの製造方法および更生タイヤを得ることができる。
【図面の簡単な説明】
【図1】台タイヤ、更生タイヤとその更生金型のビード部付近の位置関係を示した子午線方向部分断面図である。
【符号の説明】
1 更生金型
2 更生タイヤ
3 台タイヤ
W 更生金型のビードヒール間隔
P 更生金型のビードヒール点
Wk 更生タイヤのビードヒール間隔
Pk 更生タイヤのビードヒール点
Wd 台タイヤのビードヒール間隔
Pd 台タイヤのビードヒール点[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a retreaded tire and a retreaded tire, and more particularly to a method for manufacturing a retreaded tire having improved air filling properties and a retreaded tire.
[0002]
[Prior art]
Generally, when the remaining groove of the tread of a pneumatic tire reaches the end of its life, the retreaded tire is cut and buffed, and the remaining tire body is used as a base tire, and a new tread rubber is attached to it again. Thus, it is manufactured (for example, see Patent Document 1).
[0003]
However, the bead spacing on the left and right of the base tire is deformed to be narrower than the used rim width due to the influence of heat during running, etc., and in the case of a tubeless tire, when fitting the obtained retreaded tire to the rim, There has been a problem that the bead portion of the retreaded tire does not easily adhere to the rim, and the air filling property deteriorates. For retread tires with poor air filling properties, a device called an inflator that applies negative pressure from both sides of the tire bead by suction means and forcibly presses it against the rim is required. In some cases, they could not be combined.
[0004]
[Patent Document 1]
JP-A-9-239865 [0005]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a method for manufacturing a retreaded tire having improved air filling properties and a retreaded tire.
[0006]
[Means for Solving the Problems]
According to the present invention, there is provided a method of manufacturing a retread tire mounted on a 15 ° taper rim manufactured by placing a tread rubber on a tread portion of a base tire, inserting the base tire into a retread mold, and heating and vulcanizing the base tire. And a method for manufacturing a retreaded tire in which a bead heel interval of the retreaded mold is 1.15 to 1.40 times the used rim width.
[0007]
Further, according to the present invention, a tread rubber is arranged on a tread portion of a base tire, and the base tire is inserted into a rehabilitation mold and heated and vulcanized. A retreaded tire is provided in which a bead heel interval of the retreading mold is 1.15 to 1.40 times a used rim width.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial sectional view in the meridian direction showing a positional relationship between a base tire, a retreaded tire, and a bead portion of the retreaded die. In the present invention, the bead heel interval W, which is the distance between the right and left bead heel points P of the rehabilitation mold 1, is set to 1.15 to 1.1 of the used rim width (the distance between the bead heel points of the rims) of the rehabilitated tire 2 to be manufactured. 40 times. That is, the base tire 3 before vulcanization has a narrow bead interval between the left and right as described above, but it is necessary to insert the bead into the rehabilitation mold 1 with the bead wider than the used rim width and heat and vulcanize it. Thereby, the bead heel interval Wk (distance between the bead heel points Pk) of the retreaded tire 2 becomes wider than the bead heel interval Wd (distance between the bead heel points Pd) of the base tire 3. Then, when the retreaded tire 2 is fitted to the rim, the bead heel interval Wk is sufficiently widened, so that the retreaded tire 2 adheres well to the rim, and the air filling property is improved.
[0009]
The bead heel interval W of the refining mold 1 of the present invention is 1.15 to 1.40 times, preferably 1.20 to 1.35 times the used rim width, but if this value is too small, sufficient air filling is performed. On the contrary, if it is too large, the deformation amount of the base tire 3 is too large, and the deformation of the base tire 3 cannot follow the profile of the rehabilitating mold 1 and the light failure of the side tread portion ( This may cause manufacturing failures such as poor surface rubber flow) and broken carcass. Further, this value is used for a retread tire mounted on a rim having a taper angle of 15 ° with respect to the tire axial direction of the rim base as a 15 ° taper rim generally used, that is, a 15 ° deep bottom rim according to JATMA or JIS. Applicable.
[0010]
The tread rubber to be arranged on the tread portion of the base tire may be an unvulcanized retread rubber or a retread precured tread provided with a tread pattern on the surface.
[0011]
The used rim is a rim used by fitting a retreaded tire. For example, any rim having the narrowest rim width among standard rims described in JATMA 2002 version and applicable rims may be used.
[0012]
【Example】
Hereinafter, the present invention will be further described with reference to examples, but the scope of the present invention is not limited to these examples.
Examples 1-4 and Comparative Examples 1-4
As shown in Table 1 below, the bead heel intervals Wd, Wk, W of the base tire, the retreaded tire, and the retread mold and the ratio of (bead heel interval of the retread mold) / (used rim width) were changed. A heavy-duty pneumatic retread tire having a size of 11R22.5 was manufactured. Each of the obtained retreaded tires was evaluated as follows.
[0013]
Air-filling property A retreaded tire is fitted to a rim with a rim width of 7.5 inches (permissible rim described in JATMA 2002 version), air-filled without using an inflator, ○: air-filled Was evaluated as x.
[0014]
Presence / absence of manufacturing failure For the manufactured retread tire, the presence / absence of vulcanization failure such as light failure of the side tread portion (defective surface rubber flow) and carcass breakage was observed.
[0015]
[Table 1]
Figure 2004276536
[0016]
As shown in Table 1 above, in Examples 1 to 4 in which the bead heel interval of the rehabilitation mold was set to 1.15 to 1.40 times the used rim width, there was no production failure of the rehabilitation tire and the air filling property was improved. Good results were obtained.
[0017]
【The invention's effect】
According to the present invention, by setting the bead heel interval of the retread die to 1.15 to 1.40 times the used rim width, it is possible to obtain a retread tire manufacturing method and a retread tire with improved air filling properties.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view in the meridian direction showing a positional relationship near a bead portion of a base tire, a retreaded tire, and a retreading die thereof.
[Explanation of symbols]
Reference Signs List 1 rehabilitation mold 2 rehabilitation tire 3 tires W rehabilitation mold bead heel interval P rehabilitation mold bead heel point Wk rehabilitation tire bead heel interval Pk rehabilitation tire bead heel Wd

Claims (2)

台タイヤのトレッド部にトレッド用ゴムを配置し、この台タイヤを更生金型に挿入し加熱加硫して製造される15°テーパーリムに装着される更生タイヤの製造方法において、前記更生金型のビードヒール間隔が使用リム幅の1.15〜1.40倍である更生タイヤの製造方法。A method for manufacturing a retread tire to be mounted on a 15 ° taper rim manufactured by placing a tread rubber on a tread portion of a pedestal tire and inserting the pedestal tire into a retread mold and heating and vulcanizing the retread mold, A method for manufacturing a retreaded tire in which a bead heel interval is 1.15 to 1.40 times the used rim width. 台タイヤのトレッド部にトレッド用ゴムを配置し、この台タイヤを更生金型に挿入し加熱加硫して製造される15°テーパーリムに装着される更生タイヤにおいて、前記更生金型のビードヒール間隔が使用リム幅の1.15〜1.40倍である更生タイヤ。Tread rubber is arranged on the tread portion of the base tire, and the base tire is inserted into a rehabilitation mold and heated and vulcanized. A retreaded tire that is 1.15 to 1.40 times the used rim width.
JP2003074494A 2003-03-18 2003-03-18 Method for manufacturing retreaded tire, and retreaded tire Pending JP2004276536A (en)

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Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011011429A (en) * 2009-07-01 2011-01-20 Sumitomo Rubber Ind Ltd Mold for retreaded tire, and method for manufacturing retreaded tire using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011011429A (en) * 2009-07-01 2011-01-20 Sumitomo Rubber Ind Ltd Mold for retreaded tire, and method for manufacturing retreaded tire using the same

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