JP2004188858A - Method for manufacturing pneumatic tire - Google Patents
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、二つ割りタイプの金型を用いて加硫成形する空気入りタイヤの製造方法において、加硫後にタイヤが金型から離型する際のトレッド欠けを軽減する製造方法に関する。
【０００２】
【従来の技術】
従来、二つ割りタイプの金型を用いて空気入りタイヤの製造する場合、加硫後のタイヤの離型性に起因しトレッド欠けを生ずるという問題があった。タイヤを加硫した後、タイヤを加硫金型から取出す際、上金型と下金型の二つの加硫金型は上下に相互に離れるように移動する。これはタイヤの幅方向に金型が移動することを意味する。この場合、トレッド部のリブパターンあるいはブロックパターンの凸部は、タイヤ幅方向に変形歪が生じ、凸部は部分的に欠けが生ずることになる。特に深溝タイプのトレッドパターンの場合、変形歪が著しくトレッド欠けが激しくなる。
【０００３】
このようなトレッド欠けの問題を解消するため、加硫金型を円周方向に複数のセグメントに分割し、加硫後にはこれらセグメントがタイヤのラジアル方向に移動するマルチセグメントタイプの金型が使用されている。この金型はトレッド溝方向に沿って移動する為、トレッド部の凸部に変形歪を生ずることがなくトレッド欠けの問題を生じない。しかしながら、この種の金型は二つ割りタイプの金型に較べ、金型の製作費用が高く汎用性が少ない問題がある。
【０００４】
そこで二つ割りタイプの金型で加硫成形する場合において、トレッドゴムに高温で伸び率の高いゴムを用いたり、トレッド溝の形状を工夫したりしてタイヤ幅方向の変形歪に対して損傷が発生しない技術が検討されていた。また、加硫後の１００℃破断時伸びが３００％〜７００％の未加硫ゴム組成物からなる薄膜をグリーンタイヤのトレッド面に被覆し、該グレーンタイヤを二つ割りタイプの金型で加硫成形する空気入りタイヤの製造方法が提案されている（特許文献１参照）。しかしながらこの技術はタイヤの初期摩耗性および操縦安定性が必ずしも満足できるものではない。
【０００５】
【特許文献１】
特開平１０−２７２７０６号公報
【０００６】
【発明が解決しようとする課題】
本発明は上記問題を解決するもので、二つ割りタイプの金型を用いて加硫成形する空気入りタイヤの製造方法において、加硫後にタイヤが金型から離型する際のトレッド欠けを軽減し、かつ操縦安定性を改善した空気入りタイヤの製造方法を提案する。
【０００７】
【課題を解決するための手段】
本発明は二つ割りタイプの金型を用いて加硫成形する空気入りタイヤの製造方法において、ジエン系ゴム１００質量部に対して、充填剤の配合量が６５質量部未満であるトレッドゴム組成物の表面を、ジエン系ゴム１００質量部に対して充填剤が６５質量部以上のゴム組成物で、厚さが０．５〜４．０ｍｍで加硫後の破断強度（ＴB）が２０ＭＰａ以上で１００ＭＰａ以下の未加硫の帯状シートで被覆し、加硫成形したことを特徴とする空気入りタイヤの製造方法である。
【０００８】
前記未加硫帯状シートの幅はタイヤトレッド幅の６０％以下であり、加硫後の帯状シートの破断強度（ＴB）が２２ＭＰａ以上で５０ＭＰａ以下であることが好ましい。
【０００９】
【発明の実施の形態】
＜タイヤ構造＞
本発明の空気入りタイヤは、トラック／バス用タイヤ、ライトトラック用タイヤ、乗用車用タイヤ等のすべてのカテゴリーに適用できる。本発明の乗用車用空気入りタイヤを、図１に示す断面図の右半分、そのトレッド部の部分拡大図を示す図２にしたがって説明する。図１及び図２において空気入りタイヤ１は、左右一対のビードコア４の間に装架され両端が前記ビードコア４とその外側のビードエーペックス５を包むようにタイヤ内側から外側にかけて折り返されて係止されたカーカス２を備えている。そしてタイヤクラウン部外側には二層のプライよりなる環状のベルト層３がタイヤ円周方向に配置されている。そしてトレッド部６にはトレッド溝７が形成されており、ほぼ一定の厚さ（Ｔ）の帯状シート８がトレッドの外側輪郭線に沿って配置されている。
【００１０】
＜帯状シート＞
ここで帯状シートの加硫後の厚さ（Ｔ）は０．５ｍｍ以上で４．０ｍｍ以下である。帯状シートの厚さ（Ｔ）が０．５ｍｍ未満の場合、トレッド欠けの防止の効果は少なく、一方、４．０ｍｍを超えると操縦安定性あるいはグリップ性などの基本特性が犠牲になる可能性がある。好ましくは帯状シートの厚さ（Ｔ）は１．０〜３．０ｍｍの範囲である。
【００１１】
次に帯状シートは加硫後の破断強度（ＴB）が２０ＭＰａ以上で１００ＭＰａ以下である。前記破断強度（ＴB）が２０ＭＰａ未満の場合、タイヤを加硫後に金型から取出す際に、トレッド溝近傍での変形量が大きくなりトレッド欠けが有効に防止できない。一方、１００ＭＰａを超えるとゴムの剛性が高くなり、トレッド溝近傍の変形量が小さくタイヤを金型から取出す際の変形に追随できずトレッド欠けが効果的に防止できない。前記破断強度（ＴB）は、好ましくは２２〜５０ＭＰａの範囲である。
【００１２】
帯状シートは、ジエン系ゴム１００質量部に対して充填剤が６５質量部以上のゴム組成物で構成する。ここで充填剤として、カーボンブラック、重質炭酸カルシウム、軽微法炭酸カルシウム、特殊タンカル、塩基性炭酸マグネシウム、石英粉末、合成無水珪酸、合成含水珪酸、合成珪酸カルシウム、合成珪酸アルミニウム、カオリンクレー、焼成クレー、タルク、微分タルク、マイカ、水酸化アルミニウム、水酸化マグネシウム、硫酸バリウムなどを使用できる。ここで充填剤を６５質量部以上配合することで、帯状シートの加硫後の破断強度（ＴB）が前述の範囲のものが得られる。充填剤の配合量は、好ましくは７５〜１００質量部の範囲である。
【００１３】
次に前記ジエン系ゴムは、天然ゴム、ポリブタジエンゴム、スチレン−ブタジエンゴム、ポリイソプレンゴム、ブチルゴム、ＥＰＤＭなどが使用される。なお上記ジエン系ゴム成分中、２０質量％以下の範囲でジエン系ゴム以外のゴム成分を混合することができる。
【００１４】
また、ゴム組成物には通常トレッドゴムに配合される一般的な配合剤、例えば、補強剤、可塑剤、軟化剤、老化防止剤、加硫促進剤、硫黄、加硫助剤などを適宜配合できる。
【００１５】
更に前記未加硫帯状シートの幅（Ｌ）はタイヤトレッド幅（ＴＷ）の６０％以下が好ましい。ここでトレッド幅（ＴＷ）はショルダー部の輪郭線の延長線Ｒ2と、トレッド部の輪郭線の延長線Ｒ1の交点を仮想トレッド端Ｅとして、仮想トレッド端Ｅの間の距離ＴＷとして定義される。そして（Ｌ／ＴＷ×１００）は６０％以下、特に好ましくは２０〜６０％の範囲である。
【００１６】
帯状シートはトレッド部の中央部近傍に配置されることが重要であり、タイヤを金型から取出す際、トレッド部のこの領域での離型性が悪く、しかも変形歪が激しくトレッド欠けを生じやすいからである。一方、トレッド端部近傍ではタイヤの離型性が良く、また変形歪も比較的少ないので帯状シートの配置は必須ではない。乗用車タイヤでは、帯状シートの幅（Ｌ）は通常、５０〜１２０ｍｍの範囲のものが使用される。
【００１７】
＜トレッドゴム＞
本発明の空気入りタイヤのトレッドゴム組成物は、ジエン系ゴム１００質量部に対して、充填剤が６５質量部未満配合される。ウエットグリップ性及び乗り心地性などを指向した空気入りタイヤのトレッド部のゴム配合は、一般に軟らくする必要があり充填剤の配合量は少ない。この場合、加硫後のタイヤの離型性が悪くトレッド欠けの問題が生じる。本発明は充填剤を６５質量部未満、好ましくは５０〜６３質量部としてウエットグリップ性及び乗り心地性などに優れた空気入りタイヤに好適に適用し得る。なおトレッドゴムの破断強度（ＴB）は、１５〜２５ＭＰａの範囲のものが採用される。
【００１８】
トレッドゴム組成物は、通常のゴム配合が採用できる。即ち、天然ゴム、ブタジエンゴム、スチレン−ブタジエンゴム、ポリイソプレンゴムなどのジエン系ゴムに、カーボンブラック、シリカなどの充填剤のほか、可塑剤、軟化剤、老化防止剤、加硫剤および加硫助剤などがトレッドゴムの要求特性に応じて所定量配合される。
【００１９】
＜空気入りタイヤの製造方法＞
本発明は従来の方法で、ビードコア、カーカス、ベルト層及びトレッドゴムをドラム上で成形し、トロイド状のグリーンタイヤを製作する。そのトレッド部の中央部付近に未加硫の帯状シートをグリーンタイヤの円周方向に配置し、加硫金型で、通常の加硫をする。帯状シートはタイヤ加硫後に前述の破断強度を有するためトレッド部の凸部の変形歪が生じても欠けの問題を生じない。なお未加硫の帯状シートはグリーンタイヤをトロイド状にする前の円筒形状において配置することもでき、また帯状シートを未加硫状態から部分加硫状態にして配置することもできる。
【００２０】
【実施例】
実施例１、２及び比較例１
表１の配合Ｂに示すゴム組成物をトレッドゴムに用いて、タイヤサイズ１７５Ｒ１４ＰＲで図１に示す構造の空気入りタイヤを製作した。
【００２１】
表１の配合Ａでカーボンブラックを変量してゴム組成物を調整して、シート幅が１００ｍｍ（Ｌ／ＴＷ×１００＝６０％）で厚さ２ｍｍの未加硫ゴムシートを製作し、トロイド状グリ−ンタイヤのトレッド部の円周方向に配置し、加硫金型で１７０℃で８分間加硫した。帯状シートの破断強度、タイヤのデモールド性の評価は以下の方法で行なった。
【００２２】
（１） 破断強度（ＴB）の測定
ＪＩＳ−Ｋ６２５１に準じて３号ダンベル試験片を作成し、引っ張り試験を行なって破断時の強度を測定した。
【００２３】
（２）デモールド性
実施例ごとに１０本のタイヤを製作し、加硫金型からタイヤを取出す際のトレッド欠けの状態を目視で評価した。評価基準は次のとおりである。
【００２４】
○ ：トレッド欠けは発生しなかった。
△ ：トレッド欠けは１〜４ヶ所認められた。
【００２５】
× ：トレッド欠けは５ヶ所以上認められた。
表２にカーボンブラック配合量、破断強度とデモールド性の評価結果を示す。表２において帯状シートのカーボンブラックの配合量が、６５質量部（実施例１）、７５重量部（実施例２）は、５５重量部（比較例１）よりもデモールド性に優れていることが判る。
【００２６】
【表１】
【表２】
実施例３〜５及び比較例２
帯状シートの厚さとデモールド性の関係を表３に示す。帯状シートの厚さ以外はすべて実施例２と同じ仕様のタイヤを用いた。
【００２９】
【表３】
表３において、帯状シートの厚さが、０．５ｍｍ（実施例３）、２ｍｍ（実施例４）、３ｍｍ（実施例５）は、０．３ｍｍ（比較例２）よりもデモールド性に優れている。
【００３１】
実施例６〜１１
帯状シートの幅（Ｌ）と操縦安定性の関係を表４に示す。帯状シートは二種類の厚さのものについて示している。帯状シートの幅以外はすべて実施例２と同じ仕様のタイヤを用いた。
【００３２】
ここで操縦安定性は、実施例の各タイヤを実車走行し、ハンドル応答性を評価した。実施例６を６点として相対評価をした。数値が大きいほうが操縦安定性に優れている。
【００３３】
【表４】
表４において、Ｌ／ＴＷ×１００が６０％以下の場合、特に操縦安定性に優れていることがわかる。
【００３５】
【発明の効果】
上述の如く本発明は、トレッド部の表面に二つ割りタイプの金型を用いて加硫成形する空気入りタイヤの製造方法において、充填剤の配合量が６５質量部未満であるトレッドゴム組成物の表面を、６５質量部以上のゴム組成物で、厚さが０．５以上で４．０ｍｍ以下で、加硫後の破断強度（ＴB）が２０ＭＰａ以上で１００ＭＰａ以下の未加硫の帯状シートで被覆したため、トレッド欠けを効果的に軽減することができる。
【図面の簡単な説明】
【図１】本発明に基づく空気入りタイヤの右半分の断面図である。
【図２】図１のトレッド部の部分拡大図である。
【符号の説明】
１ 空気入りタイヤ、２ カーカス、３ ベルト層、４ ビードコア、５ ビードエーペックス、６ トレッド部、７ トレッド溝、８ 帯状シート。[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for manufacturing a pneumatic tire that is vulcanized and molded using a split mold, and relates to a method for reducing chipping of a tread when the tire is released from the mold after vulcanization.
[0002]
[Prior art]
Conventionally, in the case of manufacturing a pneumatic tire using a split mold, there has been a problem in that a tread is chipped due to the releasability of the vulcanized tire. After the tire is vulcanized, when the tire is removed from the vulcanization mold, the two vulcanization molds, the upper mold and the lower mold, move vertically apart from each other. This means that the mold moves in the width direction of the tire. In this case, deformation of the rib pattern or block pattern of the tread portion occurs in the tire width direction, and the protrusion is partially chipped. In particular, in the case of a tread pattern of a deep groove type, deformation distortion is remarkable, and tread chipping becomes severe.
[0003]
In order to solve such a problem of chipping of the tread, a vulcanization mold is divided into a plurality of segments in the circumferential direction, and after vulcanization, a multi-segment type mold is used in which these segments move in the radial direction of the tire. Have been. Since the mold moves along the direction of the tread groove, deformation of the protrusion of the tread portion does not occur, and the problem of chipping of the tread does not occur. However, this type of mold has a problem that the production cost of the mold is high and the versatility is low as compared with the split mold.
[0004]
Therefore, when performing vulcanization molding with a split mold, damage is caused by deformation strain in the tire width direction by using a rubber with high elongation at high temperature as the tread rubber or devising the shape of the tread groove. Not a technology was being considered. Further, a thin film made of an unvulcanized rubber composition having an elongation at break of 100 ° C. after vulcanization at 300 ° C. is coated on a tread surface of a green tire, and the green tire is vulcanized and molded with a two-part mold. A pneumatic tire manufacturing method has been proposed (see Patent Document 1). However, this technique does not always provide satisfactory initial wear and steering stability of the tire.
[0005]
[Patent Document 1]
JP 10-272706 A [0006]
[Problems to be solved by the invention]
The present invention solves the above problems, in a method of manufacturing a pneumatic tire vulcanized using a split mold, to reduce tread chipping when the tire is released from the mold after vulcanization, In addition, a method for manufacturing a pneumatic tire with improved steering stability is proposed.
[0007]
[Means for Solving the Problems]
The present invention relates to a method for producing a pneumatic tire which is vulcanized and molded by using a split mold, wherein a blending amount of a filler is less than 65 parts by mass with respect to 100 parts by mass of a diene rubber. the surface, in diene rubber filler 65 parts by mass or more of the rubber composition with respect to 100 parts by mass, breaking strength of a thickness of 0.5~4.0mm vulcanized (T B) is at least 20MPa A method for manufacturing a pneumatic tire, characterized by being coated with an unvulcanized belt-shaped sheet of 100 MPa or less and vulcanized and molded.
[0008]
The width of the unvulcanized belt-shaped sheet is preferably 60% or less of the tire tread width, and the breaking strength (T B ) of the vulcanized band-shaped sheet is preferably 22 MPa or more and 50 MPa or less.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
<Tire structure>
The pneumatic tire of the present invention can be applied to all categories such as truck / bus tires, light truck tires, and passenger car tires. The pneumatic tire for a passenger car according to the present invention will be described with reference to FIG. 2 which shows a right half of a cross-sectional view shown in FIG. 1 and a partially enlarged view of a tread portion thereof. 1 and 2, the
[0010]
<Band-shaped sheet>
Here, the thickness (T) of the belt-like sheet after vulcanization is 0.5 mm or more and 4.0 mm or less. When the thickness (T) of the belt-like sheet is less than 0.5 mm, the effect of preventing chipping of the tread is small. On the other hand, when the thickness exceeds 4.0 mm, basic characteristics such as steering stability and grip performance may be sacrificed. is there. Preferably, the thickness (T) of the band-shaped sheet is in the range of 1.0 to 3.0 mm.
[0011]
Next, the strip-shaped sheet has a breaking strength (T B ) after vulcanization of not less than 20 MPa and not more than 100 MPa. If the breaking strength (T B ) is less than 20 MPa, the amount of deformation in the vicinity of the tread groove increases when the tire is removed from the mold after vulcanization, so that tread chipping cannot be effectively prevented. On the other hand, if it exceeds 100 MPa, the rigidity of the rubber becomes high, the deformation amount near the tread groove is small, and it cannot follow the deformation at the time of removing the tire from the mold, and the tread chipping cannot be effectively prevented. The breaking strength (T B ) is preferably in the range of 22 to 50 MPa.
[0012]
The belt-shaped sheet is composed of a rubber composition in which the filler is 65 parts by mass or more based on 100 parts by mass of the diene rubber. Here, as filler, carbon black, heavy calcium carbonate, light calcium carbonate, special tanker, basic magnesium carbonate, quartz powder, synthetic anhydrous silicic acid, synthetic hydrous silicic acid, synthetic calcium silicate, synthetic aluminum silicate, kaolin clay, calcined Clay, talc, differential talc, mica, aluminum hydroxide, magnesium hydroxide, barium sulfate and the like can be used. Here, by blending the filler in an amount of at least 65 parts by mass, the strip-shaped sheet having a breaking strength (T B ) after vulcanization in the above-mentioned range can be obtained. The compounding amount of the filler is preferably in the range of 75 to 100 parts by mass.
[0013]
Next, as the diene rubber, natural rubber, polybutadiene rubber, styrene-butadiene rubber, polyisoprene rubber, butyl rubber, EPDM and the like are used. In the diene rubber component, a rubber component other than the diene rubber can be mixed in a range of 20% by mass or less.
[0014]
Also, the rubber composition is appropriately compounded with a general compounding agent usually compounded in the tread rubber, for example, a reinforcing agent, a plasticizer, a softening agent, an antioxidant, a vulcanization accelerator, sulfur, a vulcanization aid and the like. it can.
[0015]
Further, the width (L) of the unvulcanized belt-like sheet is preferably 60% or less of the tire tread width (TW). Here the tread width (TW) and the extension line R 2 contour of the shoulder portion, the intersection of the extension line R 1 of the tread portion of the contour line as a virtual tread end E, defined as the distance TW between the virtual tread end E Is done. And (L / TW × 100) is 60% or less, particularly preferably 20 to 60%.
[0016]
It is important that the belt-shaped sheet is disposed near the center of the tread portion, and when the tire is taken out of the mold, the releasability in this region of the tread portion is poor, and the deformation strain is severe and the tread is easily chipped. Because. On the other hand, in the vicinity of the end of the tread, the releasability of the tire is good and the deformation distortion is relatively small, so that the arrangement of the belt-like sheet is not essential. In passenger tires, the width (L) of the belt-shaped sheet is usually in the range of 50 to 120 mm.
[0017]
<Tread rubber>
The tread rubber composition of the pneumatic tire of the present invention contains less than 65 parts by mass of a filler with respect to 100 parts by mass of the diene rubber. The rubber compounding of the tread portion of a pneumatic tire aiming at wet grip properties and ride comfort generally needs to be soft, and the compounding amount of the filler is small. In this case, the releasability of the tire after vulcanization is poor, causing a problem of chipping of the tread. The present invention can be suitably applied to a pneumatic tire having a filler content of less than 65 parts by mass, preferably 50 to 63 parts by mass, and having excellent wet grip properties and ride comfort. The tread rubber has a breaking strength (T B ) in the range of 15 to 25 MPa.
[0018]
As the tread rubber composition, a usual rubber compounding can be adopted. That is, natural rubber, butadiene rubber, styrene-butadiene rubber, diene rubbers such as polyisoprene rubber, fillers such as carbon black and silica, plasticizers, softeners, antioxidants, vulcanizing agents and vulcanizing agents. An auxiliary agent and the like are blended in a predetermined amount according to the required characteristics of the tread rubber.
[0019]
<Production method of pneumatic tire>
In the present invention, a bead core, a carcass, a belt layer, and a tread rubber are formed on a drum by a conventional method to produce a toroidal green tire. An unvulcanized belt-shaped sheet is placed in the circumferential direction of the green tire near the center of the tread portion, and normal vulcanization is performed with a vulcanizing mold. Since the belt-shaped sheet has the above-described breaking strength after vulcanization of the tire, the problem of chipping does not occur even if deformation of the convex portion of the tread portion occurs. The unvulcanized band-shaped sheet can be arranged in a cylindrical shape before the green tire is formed into a toroidal shape, or the band-shaped sheet can be arranged from an unvulcanized state to a partially vulcanized state.
[0020]
【Example】
Examples 1 and 2 and Comparative Example 1
A pneumatic tire having a tire size of 175R14PR and a structure shown in FIG. 1 was manufactured using the rubber composition shown in Formulation B of Table 1 as a tread rubber.
[0021]
The rubber composition was adjusted by varying the amount of carbon black in Formulation A in Table 1, and an unvulcanized rubber sheet having a sheet width of 100 mm (L / TW × 100 = 60%) and a thickness of 2 mm was manufactured. The tire was placed in the circumferential direction of the tread portion of the green tire and vulcanized at 170 ° C. for 8 minutes using a vulcanizing mold. The evaluation of the breaking strength of the belt-shaped sheet and the demoldability of the tire was performed by the following methods.
[0022]
(1) Measurement of Breaking Strength (T B ) A No. 3 dumbbell test piece was prepared according to JIS-K6251 and a tensile test was performed to measure the strength at break.
[0023]
(2) Demoldability Ten tires were manufactured for each example, and the state of chipping of the tread when removing the tire from the vulcanization mold was visually evaluated. The evaluation criteria are as follows.
[0024]
: No tread chipping occurred.
Δ: 1-4 tread deficiencies were observed.
[0025]
×: Tread chipping was observed at 5 or more locations.
Table 2 shows the results of the evaluation of the blending amount of carbon black, breaking strength and demoldability. In Table 2, the blending amount of carbon black in the belt-shaped sheet is 65 parts by mass (Example 1), and 75 parts by weight (Example 2) is more excellent in demolding property than 55 parts by weight (Comparative Example 1). I understand.
[0026]
[Table 1]
[Table 2]
Examples 3 to 5 and Comparative Example 2
Table 3 shows the relationship between the thickness of the belt-shaped sheet and the demolding property. Except for the thickness of the belt-shaped sheet, all tires having the same specifications as in Example 2 were used.
[0029]
[Table 3]
In Table 3, the thickness of the belt-shaped sheet is 0.5 mm (Example 3), 2 mm (Example 4), and 3 mm (Example 5) are more excellent in demolding property than 0.3 mm (Comparative Example 2). I have.
[0031]
Examples 6 to 11
Table 4 shows the relationship between the width (L) of the belt-shaped sheet and the steering stability. The band-like sheets are shown for two thicknesses. Except for the width of the belt-shaped sheet, all tires having the same specifications as those in Example 2 were used.
[0032]
Here, the steering stability was evaluated by steering the responsiveness of each of the tires of the example while the vehicle was running in an actual vehicle. Relative evaluation was performed with Example 6 as six points. The larger the value, the better the steering stability.
[0033]
[Table 4]
In Table 4, it can be seen that when L / TW × 100 is 60% or less, the steering stability is particularly excellent.
[0035]
【The invention's effect】
As described above, the present invention relates to a method for manufacturing a pneumatic tire in which a tread portion is vulcanized and molded by using a split mold, wherein the amount of filler is less than 65 parts by mass. Is an unvulcanized belt-shaped sheet having a rubber composition of 65 parts by mass or more, a thickness of 0.5 or more and 4.0 mm or less, and a breaking strength (T B ) after vulcanization of 20 MPa or more and 100 MPa or less. Due to the covering, chipping of the tread can be effectively reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view of the right half of a pneumatic tire according to the present invention.
FIG. 2 is a partially enlarged view of a tread portion of FIG.
[Explanation of symbols]
1 Pneumatic tire, 2 carcass, 3 belt layers, 4 bead cores, 5 bead apex, 6 treads, 7 tread grooves, 8 belt-shaped sheets.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002360745A JP4262972B2 (en) | 2002-12-12 | 2002-12-12 | Pneumatic tire manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002360745A JP4262972B2 (en) | 2002-12-12 | 2002-12-12 | Pneumatic tire manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004188858A true JP2004188858A (en) | 2004-07-08 |
| JP4262972B2 JP4262972B2 (en) | 2009-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002360745A Expired - Fee Related JP4262972B2 (en) | 2002-12-12 | 2002-12-12 | Pneumatic tire manufacturing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009154791A (en) * | 2007-12-27 | 2009-07-16 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| EP2511308A1 (en) * | 2011-04-11 | 2012-10-17 | Continental Reifen Deutschland GmbH | Pneumatic tyres for a vehicle |
| JP2017042959A (en) * | 2015-08-25 | 2017-03-02 | 住友ゴム工業株式会社 | Manufacturing method for tire |
-
2002
- 2002-12-12 JP JP2002360745A patent/JP4262972B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009154791A (en) * | 2007-12-27 | 2009-07-16 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| EP2511308A1 (en) * | 2011-04-11 | 2012-10-17 | Continental Reifen Deutschland GmbH | Pneumatic tyres for a vehicle |
| JP2017042959A (en) * | 2015-08-25 | 2017-03-02 | 住友ゴム工業株式会社 | Manufacturing method for tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4262972B2 (en) | 2009-05-13 |
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