JP4191936B2 - Pneumatic tire manufacturing method and pneumatic tire - Google Patents

Pneumatic tire manufacturing method and pneumatic tire Download PDF

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JP4191936B2
JP4191936B2 JP2002037979A JP2002037979A JP4191936B2 JP 4191936 B2 JP4191936 B2 JP 4191936B2 JP 2002037979 A JP2002037979 A JP 2002037979A JP 2002037979 A JP2002037979 A JP 2002037979A JP 4191936 B2 JP4191936 B2 JP 4191936B2
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groove
tire
pneumatic tire
groove bottom
belt
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JP2003236949A (en
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透 生方
一夫 林
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Bridgestone Corp
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Bridgestone Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、空気入りタイヤの製造方法、及び空気入りタイヤに係り、特に、トレッドに周方向に延びる溝を備えた空気入りタイヤの製造方法、及び空気入りタイヤに関する。
【０００２】
【従来の技術】
近年、排水性向上のニーズが高く、技術的対応として、排水溝を比較的幅広で深く、タイヤ周方向に直線的に配置することが行われている。
【０００３】
【発明が解決しようとする課題】
ところで、溝幅を広くすると、従来の比較的平坦な成形生トレッドでは、モールドの溝型（リブ、骨部とも呼ぶ）が加硫時に成形生トレッドを押圧するため、溝底直下のベルトやカーカスが波打ってしてしまい、これが原因でタイヤの接地性能等の基本性能が損なわれる場合がある。
【０００４】
このベルトやカーカスの波打ちを改善するため、従来より、モールドの溝型が当る部分に予め溝を形成した溝付き生トレッドを用いる技術があるが、従来の生タイヤの製造過程では、生トレッドをタイヤケース（バンド組立体）に貼り付ける際、比較的平坦で幅広の押圧ステッチャーで生トレッドを押圧するため、生トレッドの溝部に圧力が作用せず、生トレッドとタイヤケースとの間に介在したエアが溝部の直下では抜けきらない、という問題があった。
【０００５】
このエア入り不良に対応する方法として、従来では、溝付き生トレッドの溝の形状を工夫することで対応していたが、結局は溝深さを浅くして押圧ステッチャーによる押圧効果を高めるようになるため、ベルトやカーカスの波打ち防止との両立が困難であった。
【０００６】
本発明は上記事実を考慮し、排水性に優れた空気入りタイヤ、及び生タイヤ製造時のエア入りを防止しつつ、排水性に優れた空気入りタイヤを製造可能な空気入りタイヤの製造方法を提供することが目的である。
【０００７】
【課題を解決するための手段】
請求項１に記載の発明は、少なくとも一対のビードコア、一方のビードコアと他方のビードコアとに跨るカーカス、及び前記カーカスの外周面に設けられる補強層とを備えたバンド組立体の外周面に、タイヤ周方向に対応する方向に延びる溝が形成された未加硫の帯状トレッド部材を貼り付けて生タイヤを形成し、前記溝と対向するように製品タイヤのトレッドに周方向溝を形成するための骨部を内周面に設けた加硫用モールド用いて前記生タイヤを加硫形成する空気入りタイヤの製造方法であって、前記帯状トレッド部材を前記バンド組立体に貼りつけた後に、前記溝の溝底の幅と同等以下の幅寸法に設定された溝底ステッチャーロールを回転させながら前記溝の溝底を長手方向沿って押圧する、ことを特徴としている。
【０００８】
次に、請求項１に記載の空気入りタイヤの製造方法の作用を説明する。
【０００９】
生タイヤは、少なくとも一対のビードコア、一方のビードコアと他方のビードコアとに跨るカーカス、及びカーカスの外周面に設けられる補強層とを備えたバンド組立体の外周面に、タイヤ周方向に対応する方向に延びる溝が形成された未加硫の帯状トレッド部材を貼り付けて形成される。
【００１０】
ここで、帯状トレッド部材をバンド組立体に貼りつけた後に、溝底の幅と同等以下の幅寸法に設定された溝底ステッチャーロールを回転させながら溝底を長手方向沿って押圧することにより、帯状トレッド部材とバンド組立体との間の溝底付近のエアを確実に押し出すことができる。
【００１１】
このようにして形成された生タイヤは、加硫用モールドに装填され、従来通り加硫モールドに設けられたブラダーが膨張して生タイヤの外周面が加硫モールドの内周面に押圧され、所定温度所定時間加硫されて製品タイヤとなる。
【００１２】
また、生のトレッドに形成された溝に加硫モールドの骨部を対向させて押圧することにより、ベルトやカーカスの波打ちを防止することが出来る。
【００１３】
請求項２に記載の発明は、請求項１に記載の空気入りタイヤの製造方法において、前記溝の溝底を前記溝底ステッチャーロールで押圧した後、前記溝以外の部分を押圧する、ことを特徴としている。
【００１４】
次に、請求項２に記載の空気入りタイヤの製造方法の作用を説明する。
【００１５】
請求項２に記載の空気入りタイヤの製造方法では、ステッチャーのかかり難い帯状トレッド部材の溝の溝底を溝底ステッチャーロールで押圧した後、帯状トレッド部材の溝以外の部分を押圧するので、帯状トレッド部材とバンド組立体との間のエアを効率的に押し出すことができる。
【００１６】
請求項３に記載の発明は、請求項１または請求項２に記載の空気入りタイヤの製造方法において、前記溝の溝深さをｄ、前記帯状トレッド部材のゲージをＴとしたときに、前記溝深さｄを前記ゲージＴの１０〜８０％の範囲内に設定した、ことを特徴としている。
【００１７】
次に、請求項３に記載の空気入りタイヤの製造方法の作用を説明する。
【００１８】
帯状トレッド部材の溝の深さｄが帯状トレッド部材のゲージＴの１０％未満になると、溝底直下のベルト、カーカスの波打ちを解消出来なくなる。
【００１９】
一方、帯状トレッド部材の溝の深さｄが帯状トレッド部材のゲージＴの８０％を越えると、帯状トレッド部材の溝底ゲージが薄すぎて成型作業時の作業性が悪化する（こし無く、しわより等の原因となる。）
請求項４に記載の発明は、請求項１乃至請求項３の何れか１項に記載の空気入りタイヤの製造方法において、前記帯状トレッド部材には、前記溝の溝底に前記帯状トレッド部材を貫通するエア抜き孔が形成されている、ことを特徴としている。
【００２０】
次に、請求項４に記載の空気入りタイヤの製造方法の作用を説明する。
【００２１】
帯状トレッド部材の溝底に帯状トレッド部材を貫通するエア抜き孔を形成すると、溝底を溝底ステッチャーロールで押圧した際に、帯状トレッド部材とバンド組立体との間のエア抜き孔を介して排出し易くなる。
【００２２】
請求項５に記載の発明は、請求項１乃至請求項４の何れか1項に記載の空気入りタイヤの製造方法において、前記溝の溝底は実質上平坦であり、前記溝底ステッチャーロールは軸方向に一定径である、ことを特徴としている。
【００２３】
次に、請求項５に記載の空気入りタイヤの製造方法の作用を説明する。
【００２４】
軸方向に一定径である溝底ステッチャーロールを回転させながら実質上平坦とされた溝底を押圧することで、溝底全体を均一に押圧することができる。
【００２７】
【発明の実施の形態】
本発明の空気入りタイヤの製造方法の一実施形態を図１乃至図５にしたがって説明する。
【００２８】
図１に示すように、本実施形態の空気入りタイヤ１０のトレッド１２には、タイヤ周方向に沿って直線状に延びる周方向主溝１４及び周方向主溝１６が形成されている。
【００２９】
本実施形態のトレッド１２は、踏面側のキャップゴム１２Ａと、キャップゴム１２Ａのタイヤ径方向内側に配置されるベースゴム１２Ｂとからなる、所謂キャップ・ベース構造である。
【００３０】
トレッド１２のタイヤ径方向内側には、複数枚のベルトプライからなるベルト１８、カーカス２０、及びインナーライナー２２が設けられている。
【００３１】
次に、この空気入りタイヤ１０の製造方法を説明する。
【００３２】
図２に示す符号２４は、ベルト１８、一対のビードコア（図示せず）、一方のビードコアと他方のビードコアとに跨るカーカス２０、インナーライナー２２等からなるバンド組立体である。
【００３３】
未加硫のトレッド１２は、下側が未加硫のベースゴム１２Ｂ、上側が未加硫のキャップゴム１２Ａである。
【００３４】
未加硫のトレッド１２には、周方向に沿って延びる第１の溝２６、及び第２の溝２８が形成されている。
【００３５】
なお、第１の溝２６の溝底、及び第２の溝２８の溝底は、平坦であることが好ましい。
【００３６】
図３に示すように、未加硫のトレッド１２はバンド組立体２４の外周面に貼り付けられる。
【００３７】
未加硫のトレッド１２をバンド組立体２４の外周面に貼り付けた後、先ず最初に、溝底ステッチャーロール３０を回転させながら第１の溝２６の溝底、及び第２の溝２８の溝底が、各々溝長手方向に順次押圧されて行く。
【００３８】
これにより、未加硫のトレッド１２とバンド組立体２４との間の溝底付近のエアが押し出される。
【００３９】
この溝底ステッチャーロール３０は、軸方向に一定径であり、かつ幅ｔ（図３参照）が溝底の幅ｗの３０〜１００％の範囲内に設定されている。
【００４０】
第１の溝２６の、及び第２の溝２８溝の溝深さｄは、未加硫のトレッド１２のゲージＴの１０〜８０％の範囲内に設定することが好ましい。
【００４１】
図２に示すように、未加硫のトレッド１２の第１の溝２６の溝底、及び第２の溝２８の溝底には、未加硫のトレッド１２を貫通するエア抜き孔２９が溝長手方向に沿って複数形成されている。
【００４２】
エア抜き孔２９は、径を０．５〜１．５ｍｍ、溝長手方向の配設ピッチを５〜５０ｍｍに設定することが好ましい。
【００４３】
エア抜き孔２９を適宜設けることにより、溝底ステッチャーロール３０により未加硫のトレッド１２の溝底を押圧する際に、未加硫のトレッド１２とバンド組立体２４との間の溝底付近のエアをエア抜き孔２９を介して外部へ押し出し易くなる。
【００４４】
第１の溝２６の溝底、及び第２の溝２８の溝底を、溝底ステッチャーロール３０を回転させながら押圧した後、図４に示すように、幅広のステッチャーロール３２を回転させながらトレッド１２の全体を押圧し、未加硫のトレッド１２とバンド組立体２４との間の溝底付近以外の部分のエアを押し出す。
【００４５】
なお、溝底ステッチャーロール３０の外周面、及びステッチャーロール３２の外周面は、未加硫のゴムが付着し難いように平滑にすることが好ましい。
【００４６】
これにより、未加硫のトレッド１２とバンド組立体２４との間のエアを全て押し出すことができる。
【００４７】
その後、図５に示すように、トレッド１２とバンド組立体２４とを一体化させた生タイヤ１０’をモールド３４に装填し、従来通りの方法で加硫成形を行う。
【００４８】
なお、モールド３４の内周面には、周方向主溝１４を形成するためのリブ状の骨部３６、及び周方向主溝１６を形成するためのリブ状の骨部３８が形成されている。
【００４９】
加硫工程では、生タイヤ１０’の内側に設けられたブラダー４０が膨張して生タイヤ１０’の外周面がモールド３４の内周面に押圧され、予め設定された所定時間所定温度にて加硫が行われる。
【００５０】
生のトレッド１２には、骨部３６に対向して第１の溝２６、骨部３８に対向して第２の溝２８が予め形成されているので、骨部３６及び骨部３８に生のトレッド１２が押圧されてもベルト１８やカーカス２０が波打つことが無く、ユニフォミティの優れた製品タイヤが得られる。
【００５１】
なお、エア抜き孔２９は、加硫時の圧力により潰れて消滅するため製品タイヤに残ることは無い。
【００５２】
【発明の効果】
以上説明したように本発明の空気入りタイヤの製造方法によれば、生タイヤ製造時のエア入りを防止しつつ、排水性及びユニフォミティに優れた空気入りタイヤを効率的に製造できる、という優れた効果を有する。
【００５３】
また、本発明の空気入りタイヤは、排水性及びユニフォミティに優れている。
【図面の簡単な説明】
【図１】本発明の空気入りタイヤの製造方法によって得られた空気入りタイヤのトレッドの断面図である。
【図２】未加硫のトレッドとバンド組立体の貼り付け前の断面図である。
【図３】生タイヤの溝底部分を溝底ステッチャーロールで押圧している様子を示すトレッドの断面図である。
【図４】生タイヤの踏面部分をステッチャーロールで押圧している様子を示すトレッドの断面図である。
【図５】生タイヤとモールドの断面図である。
【符号の説明】
１０ 空気入りタイヤ
１０’ 生タイヤ
１２ トレッド
１４ 帯状トレッド部材
１６ 周方向主溝
１８ ベルト（補強層）
２０ カーカス
２４ バンド組立体
２６ 第１の溝（溝）
２８ 第２の溝（溝）
２９ エア抜き孔
３０ 溝底ステッチャーロール
３４ モールド（加硫用モールド）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a pneumatic tire and a pneumatic tire, and more particularly to a method for manufacturing a pneumatic tire provided with a groove extending in a circumferential direction on a tread, and a pneumatic tire.
[0002]
[Prior art]
In recent years, there is a great need for improving drainage, and as a technical response, the drainage grooves are relatively wide and deep, and are arranged linearly in the tire circumferential direction.
[0003]
[Problems to be solved by the invention]
By the way, when the groove width is widened, in the conventional relatively flat molded green tread, the mold groove mold (also referred to as rib or bone) presses the molded green tread during vulcanization. May be undulated, which may impair basic performance such as tire ground contact performance.
[0004]
In order to improve the waviness of this belt and carcass, there is a technology that uses a grooved raw tread in which grooves are formed in advance on the part where the groove shape of the mold hits, but in the conventional raw tire manufacturing process, a raw tread is used. When affixing to the tire case (band assembly), the raw tread is pressed by a relatively flat and wide pressing stitcher, so no pressure is applied to the groove of the raw tread, and it is interposed between the raw tread and the tire case. There was a problem that air could not be removed directly under the groove.
[0005]
In the past, as a method for dealing with this poor air entry, it was devised by devising the shape of the groove of the grooved raw tread, but eventually the depth of the groove was made shallow so as to enhance the pressing effect by the press stitcher. Therefore, it has been difficult to achieve both the belt and carcass undulation prevention.
[0006]
In consideration of the above facts, the present invention provides a pneumatic tire excellent in drainage and a pneumatic tire manufacturing method capable of manufacturing a pneumatic tire excellent in drainage while preventing air entry during production of a raw tire. The purpose is to provide.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a tire on an outer peripheral surface of a band assembly including at least a pair of bead cores, a carcass straddling one bead core and the other bead core, and a reinforcing layer provided on the outer peripheral surface of the carcass. An unvulcanized belt-shaped tread member formed with a groove extending in a direction corresponding to the circumferential direction is attached to form a raw tire, and a circumferential groove is formed in the tread of the product tire so as to face the groove A pneumatic tire manufacturing method for vulcanizing and forming the green tire using a vulcanization mold having a bone portion provided on an inner peripheral surface, wherein the groove is formed after the belt-shaped tread member is attached to the band assembly. The groove bottom of the groove is pressed along the longitudinal direction while rotating the groove bottom stitcher roll set to a width dimension equal to or less than the width of the groove bottom.
[0008]
Next, the operation of the pneumatic tire manufacturing method according to claim 1 will be described.
[0009]
The green tire has a direction corresponding to the tire circumferential direction on the outer peripheral surface of the band assembly including at least a pair of bead cores, a carcass straddling one bead core and the other bead core, and a reinforcing layer provided on the outer peripheral surface of the carcass. It is formed by pasting an unvulcanized belt-like tread member in which a groove extending in the direction is formed.
[0010]
Here, after affixing the band-shaped tread member to the band assembly, by pressing the groove bottom along the longitudinal direction while rotating the groove bottom stitcher roll set to a width dimension equal to or less than the width of the groove bottom, The air near the groove bottom between the belt-like tread member and the band assembly can be reliably pushed out.
[0011]
The green tire formed in this way is loaded into a vulcanization mold, the bladder provided in the vulcanization mold is expanded as usual, and the outer peripheral surface of the raw tire is pressed against the inner peripheral surface of the vulcanization mold, The product tire is vulcanized at a predetermined temperature for a predetermined time.
[0012]
Further, the undulation of the belt or the carcass can be prevented by pressing the vulcanization mold with the bone portion facing the groove formed in the raw tread.
[0013]
Invention of Claim 2 is a manufacturing method of the pneumatic tire of Claim 1, After pressing the groove bottom of the said groove | channel with the said groove bottom stitcher roll, it presses parts other than the said groove | channel. It is a feature.
[0014]
Next, the operation of the pneumatic tire manufacturing method according to claim 2 will be described.
[0015]
In the method for manufacturing a pneumatic tire according to claim 2, since the groove bottom of the belt-like tread member that is difficult to be stitched is pressed by the groove-bottom stitcher roll, the portion other than the groove of the belt-like tread member is pressed. Air between the tread member and the band assembly can be efficiently pushed out.
[0016]
Invention of Claim 3 WHEREIN: In the manufacturing method of the pneumatic tire of Claim 1 or Claim 2, when the groove depth of the said groove | channel is set to d and the gauge of the said strip | belt-shaped tread member is set to T, The groove depth d is set within a range of 10 to 80% of the gauge T.
[0017]
Next, the operation of the pneumatic tire manufacturing method according to claim 3 will be described.
[0018]
When the groove depth d of the belt-like tread member becomes less than 10% of the gauge T of the belt-like tread member, the undulation of the belt and the carcass just below the groove bottom cannot be eliminated.
[0019]
On the other hand, when the groove depth d of the belt-like tread member exceeds 80% of the gauge T of the belt-like tread member, the groove bottom gauge of the belt-like tread member is too thin and the workability at the time of molding deteriorates (no wrinkles and wrinkles). Cause more equality.)
According to a fourth aspect of the present invention, in the method for manufacturing a pneumatic tire according to any one of the first to third aspects, the belt-like tread member includes the belt-like tread member at the groove bottom of the groove. An air vent hole penetrating therethrough is formed.
[0020]
Next, the operation of the pneumatic tire manufacturing method according to claim 4 will be described.
[0021]
When an air vent hole that penetrates the belt-like tread member is formed at the groove bottom of the belt-like tread member, when the groove bottom is pressed by the groove bottom stitcher roll, the air vent hole between the belt-like tread member and the band assembly is interposed. It becomes easy to discharge.
[0022]
According to a fifth aspect of the present invention, in the method of manufacturing a pneumatic tire according to any one of the first to fourth aspects, the groove bottom of the groove is substantially flat, and the groove bottom stitcher roll is It is characterized by a constant diameter in the axial direction.
[0023]
Next, the operation of the pneumatic tire manufacturing method according to claim 5 will be described.
[0024]
By pressing the groove bottom that is substantially flat while rotating the groove bottom stitcher roll having a constant diameter in the axial direction, the entire groove bottom can be pressed uniformly.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a method for producing a pneumatic tire according to the present invention will be described with reference to FIGS.
[0028]
As shown in FIG. 1, a circumferential main groove 14 and a circumferential main groove 16 that extend linearly along the tire circumferential direction are formed in the tread 12 of the pneumatic tire 10 of the present embodiment.
[0029]
The tread 12 according to the present embodiment has a so-called cap-base structure including a tread-side cap rubber 12A and a base rubber 12B disposed on the inner side in the tire radial direction of the cap rubber 12A.
[0030]
On the inner side of the tread 12 in the tire radial direction, a belt 18 including a plurality of belt plies, a carcass 20, and an inner liner 22 are provided.
[0031]
Next, a method for manufacturing the pneumatic tire 10 will be described.
[0032]
Reference numeral 24 shown in FIG. 2 is a band assembly including a belt 18, a pair of bead cores (not shown), a carcass 20 straddling one bead core and the other bead core, an inner liner 22 and the like.
[0033]
The unvulcanized tread 12 has an unvulcanized base rubber 12B on the lower side and an unvulcanized cap rubber 12A on the upper side.
[0034]
The unvulcanized tread 12 is formed with a first groove 26 and a second groove 28 extending along the circumferential direction.
[0035]
The groove bottom of the first groove 26 and the groove bottom of the second groove 28 are preferably flat.
[0036]
As shown in FIG. 3, the unvulcanized tread 12 is attached to the outer peripheral surface of the band assembly 24.
[0037]
After the unvulcanized tread 12 is attached to the outer peripheral surface of the band assembly 24, first, the groove bottom of the first groove 26 and the groove of the second groove 28 are rotated while the groove bottom stitcher roll 30 is rotated. The bottom is sequentially pressed in the longitudinal direction of each groove.
[0038]
Thereby, the air near the groove bottom between the unvulcanized tread 12 and the band assembly 24 is pushed out.
[0039]
The groove bottom stitcher roll 30 has a constant diameter in the axial direction, and the width t (see FIG. 3) is set within a range of 30 to 100% of the width w of the groove bottom.
[0040]
The groove depth d of the first groove 26 and the second groove 28 is preferably set within a range of 10 to 80% of the gauge T of the unvulcanized tread 12.
[0041]
As shown in FIG. 2, an air vent hole 29 penetrating the unvulcanized tread 12 is formed in the groove bottom of the first groove 26 of the unvulcanized tread 12 and the groove bottom of the second groove 28. A plurality are formed along the longitudinal direction.
[0042]
The air vent holes 29 preferably have a diameter of 0.5 to 1.5 mm and a pitch in the groove longitudinal direction of 5 to 50 mm.
[0043]
By appropriately providing the air vent hole 29, when the groove bottom of the unvulcanized tread 12 is pressed by the groove bottom stitcher roll 30, the vicinity of the groove bottom between the unvulcanized tread 12 and the band assembly 24 is provided. It becomes easy to push air out through the air vent hole 29.
[0044]
After pressing the groove bottom of the first groove 26 and the groove bottom of the second groove 28 while rotating the groove bottom stitcher roll 30, the tread while rotating the wide stitcher roll 32 as shown in FIG. 12 is pressed, and air in portions other than the vicinity of the groove bottom between the unvulcanized tread 12 and the band assembly 24 is pushed out.
[0045]
In addition, it is preferable that the outer peripheral surface of the groove bottom stitcher roll 30 and the outer peripheral surface of the stitcher roll 32 are made smooth so that unvulcanized rubber hardly adheres.
[0046]
Thereby, all the air between the unvulcanized tread 12 and the band assembly 24 can be pushed out.
[0047]
Thereafter, as shown in FIG. 5, a green tire 10 ′ in which the tread 12 and the band assembly 24 are integrated is loaded into a mold 34 and vulcanized by a conventional method.
[0048]
A rib-like bone portion 36 for forming the circumferential main groove 14 and a rib-like bone portion 38 for forming the circumferential main groove 16 are formed on the inner peripheral surface of the mold 34. .
[0049]
In the vulcanization process, the bladder 40 provided inside the raw tire 10 'expands, the outer peripheral surface of the raw tire 10' is pressed against the inner peripheral surface of the mold 34, and is heated at a predetermined temperature for a preset predetermined time. Sulfur is performed.
[0050]
In the raw tread 12, the first groove 26 and the second groove 28 are formed in advance so as to face the bone portion 36 and the bone portion 38. Even if the tread 12 is pressed, the belt 18 and the carcass 20 do not wave, and a product tire with excellent uniformity can be obtained.
[0051]
In addition, since the air vent hole 29 is crushed and disappears due to the pressure during vulcanization, it does not remain in the product tire.
[0052]
【The invention's effect】
As described above, according to the method for producing a pneumatic tire of the present invention, it is possible to efficiently produce a pneumatic tire excellent in drainage and uniformity while preventing air entry during production of a raw tire. Has an effect.
[0053]
Moreover, the pneumatic tire of the present invention is excellent in drainage and uniformity.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tread of a pneumatic tire obtained by the method for manufacturing a pneumatic tire of the present invention.
FIG. 2 is a cross-sectional view of an unvulcanized tread and a band assembly before being attached.
FIG. 3 is a cross-sectional view of a tread showing a state in which a groove bottom portion of a raw tire is pressed by a groove bottom stitcher roll.
FIG. 4 is a cross-sectional view of a tread showing a state where a tread surface portion of a raw tire is pressed by a stitcher roll.
FIG. 5 is a cross-sectional view of a green tire and a mold.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Pneumatic tire 10 'Raw tire 12 Tread 14 Band-shaped tread member 16 Circumferential main groove 18 Belt (reinforcing layer)
20 Carcass 24 Band assembly 26 First groove (groove)
28 Second groove (groove)
29 Air vent hole 30 Groove bottom stitcher roll 34 Mold (mold for vulcanization)

Claims (5)

少なくとも一対のビードコア、一方のビードコアと他方のビードコアとに跨るカーカス、及び前記カーカスの外周面に設けられる補強層とを備えたバンド組立体の外周面に、タイヤ周方向に対応する方向に延びる溝が形成された未加硫の帯状トレッド部材を貼り付けて生タイヤを形成し、前記溝と対向するように製品タイヤのトレッドに周方向溝を形成するための骨部を内周面に設けた加硫用モールド用いて前記生タイヤを加硫形成する空気入りタイヤの製造方法であって、
前記帯状トレッド部材を前記バンド組立体に貼りつけた後に、前記溝の溝底の幅と同等以下の幅寸法に設定された溝底ステッチャーロールを回転させながら前記溝の溝底を長手方向沿って押圧する、ことを特徴とする空気入りタイヤの製造方法。A groove extending in the direction corresponding to the tire circumferential direction on the outer peripheral surface of the band assembly including at least a pair of bead cores, a carcass straddling one bead core and the other bead core, and a reinforcing layer provided on the outer peripheral surface of the carcass A raw tire is formed by pasting an unvulcanized belt-shaped tread member formed with a rim, and a bone portion for forming a circumferential groove on the tread of the product tire is provided on the inner peripheral surface so as to face the groove. A method for producing a pneumatic tire by vulcanizing the green tire using a vulcanization mold,
After affixing the band-shaped tread member to the band assembly, the groove bottom of the groove is moved along the longitudinal direction while rotating a groove bottom stitcher roll set to a width dimension equal to or less than the width of the groove bottom of the groove. A method for manufacturing a pneumatic tire, characterized by pressing. 前記溝の溝底を前記溝底ステッチャーロールで押圧した後、前記溝以外の部分を押圧する、ことを特徴とする請求項１に記載の空気入りタイヤの製造方法。  The method for manufacturing a pneumatic tire according to claim 1, wherein after the groove bottom of the groove is pressed by the groove bottom stitcher roll, a portion other than the groove is pressed. 前記溝の溝深さをｄ、前記帯状トレッド部材のゲージをＴとしたときに、前記溝深さｄを前記ゲージＴの１０〜８０％の範囲内に設定した、ことを特徴とする請求項１または請求項２に記載の空気入りタイヤの製造方法。  The groove depth d is set within a range of 10 to 80% of the gauge T, where d is a groove depth of the groove and T is a gauge of the belt-shaped tread member. The manufacturing method of the pneumatic tire of Claim 1 or Claim 2. 前記帯状トレッド部材には、前記溝の溝底に前記帯状トレッド部材を貫通するエア抜き孔が形成されている、ことを特徴とする請求項１乃至請求項３の何れか１項に記載の空気入りタイヤの製造方法。  The air according to any one of claims 1 to 3, wherein the belt-like tread member has an air vent hole penetrating the belt-like tread member at a groove bottom of the groove. A method for manufacturing a tire. 前記溝の溝底は実質上平坦であり、前記溝底ステッチャーロールは軸方向に一定径である、ことを特徴とする請求項１乃至請求項４の何れか1項に記載の空気入りタイヤの製造方法。  5. The pneumatic tire according to claim 1, wherein a groove bottom of the groove is substantially flat, and the groove bottom stitcher roll has a constant diameter in an axial direction. Production method.
JP2002037979A 2002-02-15 2002-02-15 Pneumatic tire manufacturing method and pneumatic tire Expired - Fee Related JP4191936B2 (en)

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JP5626505B2 (en) * 2009-06-24 2014-11-19 横浜ゴム株式会社 Pneumatic tire manufacturing method
JP2012035499A (en) * 2010-08-06 2012-02-23 Bridgestone Corp Method of manufacturing tire, tread member and tire
CN103079802B (en) * 2010-08-06 2015-06-10 株式会社普利司通 Tire production method, tread member, and tire
JP5557647B2 (en) * 2010-08-11 2014-07-23 株式会社ブリヂストン Pneumatic tire manufacturing method and cylindrical body conveying device
FR2964603B1 (en) * 2010-09-14 2016-07-01 Soc De Tech Michelin PNEUMATIC AND MOLD COMPRISING A FLUIDIC PASSAGE
CN104684720B (en) * 2012-10-31 2017-05-17 米其林集团总公司 Method of retreading a tire
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