JP2005262743A - Manufacturing method of tire - Google Patents

Manufacturing method of tire Download PDF

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JP2005262743A
JP2005262743A JP2004080891A JP2004080891A JP2005262743A JP 2005262743 A JP2005262743 A JP 2005262743A JP 2004080891 A JP2004080891 A JP 2004080891A JP 2004080891 A JP2004080891 A JP 2004080891A JP 2005262743 A JP2005262743 A JP 2005262743A
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tire
tread ring
tread
bead
tire base
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JP4490712B2 (en
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Takashi Tanaka
尚 田中
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress accumulation of air, a bite of an outer edge of a tread ring or the like in case of jointing a green tire base body and a tread ring. <P>SOLUTION: The cylindrical green tire base body 2 having a bead portion 4 locked with a clamp 14 of a former 10 is toroidally expanded by pushing pressure of a rubber bladder 12 and is plastered on the inner surface of the tread ring 3. The clamp 14 has an extension portion 23 protruding to a facing direction and capable of throttling a root portion 12A1 of the expanded portion 12A during expansion of the bladder 12, thereby forming a diameter-reduced expansion portion 24 in which the diameter R1 on the tread side is smaller than the diameter R2 of the inner surface of the tread ring 3 around the equator of the tire in the green tire base body 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、特にトレッド曲率半径が小な自動二輪車用タイヤの製造に好適であり、生タイヤ基体をトロイド状に膨張させてトレッドリングに貼着する際の、トレッドリング外端での噛み込み、及びトレッドリングと生タイヤ基体との間のエアー溜まりの発生などを抑制しうるタイヤ製造方法に関する。   The present invention is particularly suitable for manufacturing a motorcycle tire having a small tread radius of curvature, and biting at the outer end of the tread ring when the raw tire base is inflated and attached to the tread ring, The present invention also relates to a tire manufacturing method capable of suppressing the occurrence of air accumulation between a tread ring and a green tire base.

所謂２ステージ成型法により生タイヤを形成する場合、予め第１成形（ファーストステージ）によって形成されたカーカスを含む円筒状の生タイヤ基体ａを、図６（Ａ）に示すように、フォーマｂに移し換えて保持し、ビード部ａ１、ａ１間を接近させながらゴムブラダｃを介してトロイド状に膨張させることにより、前記生タイヤ基体ａを、その半径方向外側で待機させたトレッドゴムを含むトレッドリングｔにドッキングさせている。   When forming a raw tire by the so-called two-stage molding method, a cylindrical raw tire base a including a carcass previously formed by first molding (first stage) is formed into a former b as shown in FIG. A tread ring including a tread rubber that holds the raw tire base a on the outside in the radial direction by holding the raw tire base a in a toroidal shape through a rubber bladder c while moving and holding the beads a1 and a1 close to each other. docked at t.

他方、自動二輪車用タイヤでは、車体を大きくバンクさせて旋回する特性上、トレッド部は四輪用タイヤに比して曲率半径が非常に小さい円弧状プロファイルで形成されている。そのため、自動二輪車用の生タイヤのトレッドリングｔは、加硫後の製品タイヤのトレッドプロファイルに近似させた小円弧状に形成されている。   On the other hand, in a motorcycle tire, the tread portion is formed with an arcuate profile having a very small radius of curvature compared to a four-wheel tire due to the characteristic of turning the vehicle body in a large bank. Therefore, a tread ring t of a raw tire for a motorcycle is formed in a small arc shape approximated to a tread profile of a product tire after vulcanization.

しかしこのことは、前記２ステージ成型法において、トレッドリングｔを生タイヤ基体ａにドッキングさせる際、トレッドリングｔ内面の曲率半径ｒ２が生タイヤ基体ａの膨張部の曲率半径ｒ１よりも小さくなる傾向を生む。その結果、トレッドリングｔと生タイヤ基体ａとの間にエアー溜まりｘが発生しやすくなるなど歩留まりの悪化を招く。又膨張過程で、図６（Ｂ）の如く、先にトレッドリングｔの外端ｔｅが生タイヤ基体ａと接触して、トレッドリングｔとのセンターずれ（オフセンタ）を起こすほか、トレッドリングｔの外端ｔｅが噛み込まれてタイヤ外表面にベア（凹状の傷）を生じさせるなど、ユニフォミティーや外観品質を低下させるという問題も生じる。   However, this means that when the tread ring t is docked to the raw tire base a in the two-stage molding method, the radius of curvature r2 of the inner surface of the tread ring t tends to be smaller than the radius of curvature r1 of the expansion portion of the raw tire base a. Give birth. As a result, the yield is deteriorated, for example, an air pool x is easily generated between the tread ring t and the green tire base a. In the expansion process, as shown in FIG. 6 (B), the outer end te of the tread ring t comes into contact with the raw tire base a first to cause a center shift (off-center) from the tread ring t. There is also a problem that the uniformity and appearance quality are deteriorated, for example, the outer end te is bitten and a bear (concave scratch) is generated on the outer surface of the tire.

なお特許文献１には、生タイヤ基体を、フロファイルデッキを用いて加硫タイヤのトレッドプロファイルに近い形状に膨張せしめ、このフロファイルデッキに支持させた生タイヤ基体に、直接にバンドやトレッドゴムなどのトレッド構成部材を添設することが提案されいる。しかしこのものは、タイヤサイズ毎のフロファイルデッキが必要であり、又生産効率にも不利を招く。   In Patent Document 1, a raw tire base is inflated into a shape close to a tread profile of a vulcanized tire using a profile deck, and a band or a tread rubber is directly applied to the raw tire base supported by the profile deck. It has been proposed to attach tread components such as the above. However, this requires a profile deck for each tire size, and also has a disadvantage in production efficiency.

特開平２００３−１１８０１１号公報Japanese Patent Application Laid-Open No. 2003-118011

本発明は、フォーマのクランプ具に延長部を突設し、ゴムブラダの膨張に際しての膨張部の根元部分を絞ることを基本として、前記生タイヤ基体のトレッド側半径を、トレッドリングのタイヤ赤道付近の内面半径よりも小に減じることができ、生タイヤ基体の頂部からのトレッドリングへの当接を可能とし、トレッドリングと生タイヤ基体との間のエアー溜まりの発生、トレッドリング外端の噛み込み、センターずれなどを抑制しうるタイヤ製造方法を提供することを目的としている。   The present invention is based on the fact that an extension part is projected from the former clamp tool and the base part of the inflating part is squeezed when the rubber bladder is inflated, and the tread side radius of the green tire base is set near the tire equator of the tread ring. It can be reduced to be smaller than the inner radius, allowing contact with the tread ring from the top of the raw tire base, generating air traps between the tread ring and the raw tire base, and biting the outer end of the tread ring An object of the present invention is to provide a tire manufacturing method capable of suppressing center deviation and the like.

前記目的を達成するために、本願請求項１の発明は、フォーマにより保持された生タイヤ基体と、該生タイヤ基体の半径方向外側に配置されかつ生タイヤ基体のトロイド状の膨張とともにこの生タイヤ基体に一体に貼着されるトレッドリングとにより生タイヤを形成する第２成形を有する２ステージ成型法による生タイヤを用いたタイヤ製造方法であって、
前記第２成形には、前記フォーマによりビード部がロックされた円筒状の生タイヤ基体を、前記ビード部間の軸方向への接近移動とともにその内面を押圧してトロイド状に膨張させるゴムブラダが用いられ、
かつ該ゴムブラダは、このゴムブラダの向き合う各内側面を保持する両側のインナクランプと、各外側面を保持する両側のアウタクランプとからなるクランプ具により気密に固定されるとともに、
前記クランプ具に、このクランプ具から向き合う側に突出し前記ゴムブラダに当接しうる延長部を形成し、該延長部により前記ゴムブラダの膨張に際しての膨張部の根元部分を絞ることによって、タイヤ軸を含む子午断面において、前記生タイヤ基体のトレッド側の半径Ｒ１を、前記トレッドリングのタイヤ赤道付近の内面の半径Ｒ２よりも小に減じた減径膨張部を生タイヤ基体に形成することを特徴としている。 In order to achieve the above object, the invention according to claim 1 of the present application is a raw tire base held by a former, and the raw tire is disposed with a toroidal expansion of the raw tire base and disposed radially outside the raw tire base. A tire manufacturing method using a raw tire by a two-stage molding method having a second molding that forms a raw tire with a tread ring that is integrally attached to a substrate,
In the second molding, a rubber bladder is used that expands a cylindrical raw tire base body, whose bead portion is locked by the former, in the axial direction between the bead portions and presses the inner surface thereof to form a toroid. And
And the rubber bladder is hermetically fixed by a clamp tool composed of inner clamps on both sides for holding the inner side surfaces of the rubber bladder and outer clamps on both sides for holding the outer side surfaces,
An extension portion is formed on the clamp tool so as to protrude from a side facing the clamp tool so as to contact the rubber bladder. By the extension portion, a root portion of the expansion portion when the rubber bladder is expanded is squeezed. In the cross section, the raw tire base is formed with a reduced diameter inflating portion in which the radius R1 on the tread side of the raw tire base is reduced to be smaller than the radius R2 of the inner surface near the tire equator of the tread ring.

又請求項２の発明では、前記ビード部は、前記アウタクランプの外周面に形成されかつ前記ビード部の底面が着座する着座面とビード部の内側面が当接する当接面とを有するビード支持部にロックされるとともに、該アウタクランプに前記延長部を形成したことを特徴としている。   According to a second aspect of the present invention, the bead portion has a bead support formed on an outer peripheral surface of the outer clamp and having a seating surface on which a bottom surface of the bead portion is seated and a contact surface on which an inner surface of the bead portion abuts. The extension portion is formed on the outer clamp and is locked to the outer clamp.

又請求項３の発明では、前記減径膨張部と前記トレッドリングのショルダ部の内面とは、前記減径膨張部の頂部が前記トレッドリングのタイヤ赤道付近で当接した後、接触位置がショルダ側に移動することにより、前記減径膨張部とトレッドリングのショルダ部の内面とが接触することを特徴としている。   According to a third aspect of the present invention, the reduced diameter expansion portion and the inner surface of the shoulder portion of the tread ring are in contact with the shoulder after the top of the reduced diameter expansion portion abuts near the tire equator of the tread ring. By moving to the side, the reduced diameter expansion portion and the inner surface of the shoulder portion of the tread ring are in contact with each other.

又請求項４の発明では、前記延長部は、前記ビード支持部の当接面からの軸方向の突出長さＷを１０〜６５ｍｍとしたことを特徴としている。   According to a fourth aspect of the present invention, the extension portion is characterized in that the protruding length W in the axial direction from the contact surface of the bead support portion is 10 to 65 mm.

又請求項５の発明では、前記タイヤが自動二輪車用タイヤであることを特徴としている。   The invention according to claim 5 is characterized in that the tire is a motorcycle tire.

本発明は叙上の如く構成しているため、トレッドリングと生タイヤ基体との貼り付けに際してのエアー溜まりの発生、トレッドリング外端の噛み込み、センターずれなどを効果的に抑制でき、歩留まりを高めうるとともに、ユニフォミティーや外観品質を向上させることができる。   Since the present invention is configured as described above, it is possible to effectively suppress the occurrence of air accumulation when the tread ring is attached to the green tire base, biting of the outer end of the tread ring, center deviation, etc. In addition to being able to improve, uniformity and appearance quality can be improved.

以下、本発明の実施の一形態を、図示例とともに説明する。
本発明のタイヤ製造方法は、所謂２ステージ成型法によって形成された生タイヤ１を、金型内で加硫成形することにより製品タイヤを製造する製造方法であって、前記２ステージ成型法では、図１に示すように、フォーマ１０により保持された生タイヤ基体２と、その半径方向外側で待機させたトレッドリング３とを、前記生タイヤ基体２のトロイド状の膨張とともに貼着する第２成形を具える。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The tire manufacturing method of the present invention is a manufacturing method for manufacturing a product tire by vulcanizing a raw tire 1 formed by a so-called two-stage molding method in a mold, and in the two-stage molding method, As shown in FIG. 1, a second molding is performed in which a green tire base 2 held by a former 10 and a tread ring 3 that is kept on the outside in the radial direction are bonded together with the toroidal expansion of the green tire base 2. With

本例では、前記製品タイヤが自動二輪車用タイヤである場合を例示している。この自動二輪車用タイヤでは、図５にその一例を示すように、トレッド面ｔｓ上のタイヤ赤道点ｐｃからトレッド端ｐｅまでの間の、タイヤ軸方向の距離Ｌｘと半径方向の距離Ｌｙとの比であるキャンバー値Ｌｙ／Ｌｘが、例えば０．３以上（通常０．５以上）であるなど、四輪車用タイヤに比して曲率半径が小な円弧状のトレッドプロファイルを有する。   In this example, the case where the product tire is a motorcycle tire is illustrated. In this motorcycle tire, as shown in FIG. 5 as an example, the ratio between the tire axial distance Lx and the radial distance Ly between the tire equator point pc on the tread surface ts and the tread end pe. The camber value Ly / Lx is, for example, 0.3 or more (usually 0.5 or more), and has an arc-shaped tread profile having a smaller radius of curvature than that of a four-wheeled vehicle tire.

又この自動二輪車用タイヤの生タイヤ１を形成するための前記トレッドリング３は、予め周知のプロファイルデッキ上でトレッドゴムを含むトレッド部材を巻装することにより、前記トレッド面ｔｓに近似した小円弧状プロファイルで形成される。トレッド部材としては他に、タイヤコードをタイヤ周方向に平行配列させたバンドプライ、交差配列させたベルトプライなどを含めることができる。又前記生タイヤ基体２も、従来と同様、予め周知の円筒状の第１フォーマ上で、カーカスプライを含むタイヤ部材を巻装することにより円筒状に形成される。タイヤ部材としては他に、インナーライナゴム、ビードコア、ビードエーペックスゴム、サイドウォールゴムなどを含めることができる。   The tread ring 3 for forming the raw tire 1 of the motorcycle tire is a small circle that approximates the tread surface ts by winding a tread member including a tread rubber on a known profile deck in advance. Formed with an arcuate profile. In addition, the tread member may include a band ply in which tire cords are arranged in parallel in the tire circumferential direction, a belt ply in which crossed arrangement is made, and the like. The green tire base 2 is also formed in a cylindrical shape by winding a tire member including a carcass ply on a well-known cylindrical first former in the same manner as in the past. Other examples of the tire member include inner liner rubber, bead core, bead apex rubber, and sidewall rubber.

そして、この円筒状の生タイヤ基体２が、第２フォーマである前記フォーマ１０に移載された後、前記トレッドリング３との接合工程である第２成形が行れる。   And after this cylindrical raw tire base | substrate 2 is transferred to the said former 10 which is a 2nd former, the 2nd shaping | molding which is a joining process with the said tread ring 3 is performed.

ここで前記フォーマ１０は、図１の如く、円筒状の前記生タイヤ基体２を、そのビード部４、４をロックして保持するビード支持部１１と、保持された生タイヤ基体２の前記ビード部４、４が軸方向に接近移動する際に、生タイヤ基体２の内面を押圧してトロイド状に膨張させるゴムブラダー１２と、該ゴムブラダー１２のタイヤ軸方向両側部をそれぞれ気密に固着保持する左右一対のクランプ体１３からなるクランプ具１４とを具える。そして前記ビード支持部１１は、各クランプ体１３に設けられるとともに、このクランプ体１３は、回転自在な主軸１５に、該主軸１５とは一体回転可能にかつ他方のクランプ体１３とは軸方向に向かって相対的に近離移動可能に支持される。   Here, as shown in FIG. 1, the former 10 includes a bead support portion 11 that holds the cylindrical raw tire base 2 by locking the bead portions 4 and 4, and the bead of the held raw tire base 2. When the parts 4 and 4 move close to each other in the axial direction, the rubber bladder 12 that presses the inner surface of the raw tire base 2 and expands in a toroid shape, and the left and right sides that tightly hold the both sides of the rubber bladder 12 in the axial direction of the tire A clamp tool 14 including a pair of clamp bodies 13 is provided. The bead support portion 11 is provided on each clamp body 13, and the clamp body 13 is rotatably connected to the main shaft 15, can rotate integrally with the main shaft 15, and is axially connected to the other clamp body 13. It is supported so as to be relatively movable toward and away.

詳しくは、前記ゴムブラダー１２は、周知構造をなすゴム膜体であって、図２に略示する如く、無負荷の自然状態において円筒状をなすブラダ胴部３０の軸方向両端に、本例では、該両端から半径方向内方に小長さで折れ曲がるブラダ側部３１を介して開口部３２を形成している。   Specifically, the rubber bladder 12 is a rubber film body having a well-known structure, and as shown schematically in FIG. 2, in the present example, at both ends in the axial direction of a cylindrical cylinder body 30 in a natural state without load. An opening 32 is formed through a bladder side portion 31 that is bent at a small length radially inward from both ends.

又前記クランプ体１３は、図３に拡大して示す如く、前記ブラダ側部３１の内側面を保持するインナクランプ１６と、ブラダ側部３１の外側面を保持するアウタクランプ１７とから形成される。   The clamp body 13 is formed of an inner clamp 16 that holds the inner surface of the bladder side portion 31 and an outer clamp 17 that holds the outer surface of the bladder side portion 31, as shown in an enlarged view in FIG. .

前記インナクランプ１６は、本例では、前記主軸１５に支持される円盤状のクランプ本体１６Ａを具え、このクランプ本体１６Ａの半径方向外方には、軸方向内向きに折返されたブラダ側部３１の先端部分３１Ａ（開口縁部分３１Ａという場合がある）を嵌入する凹部１８、及びこの凹部１８に連なりかつ前記折返されたブラダ側部３１とブラダ胴部３０との間に介在する凸部１９を形成している。なお凸部１９はその外周面を、前記ゴムブラダー１２が自然状態の円筒状に縮径した際のブラダ胴部３０の内面を受ける受け面１９Ｓとして形成している。   In this example, the inner clamp 16 includes a disc-shaped clamp main body 16A supported by the main shaft 15, and a bladder side portion 31 folded inward in the axial direction is formed radially outward of the clamp main body 16A. A concave portion 18 into which the front end portion 31A (which may be referred to as an opening edge portion 31A) is inserted, and a convex portion 19 connected to the concave portion 18 and interposed between the folded bladder side portion 31 and the bladder trunk portion 30. Forming. In addition, the convex part 19 forms the outer peripheral surface as the receiving surface 19S which receives the inner surface of the bladder trunk | drum 30 when the said rubber bladder 12 is diameter-reduced to the cylindrical shape of a natural state.

又前記アウタクランプ１７は、本例では、前記クランプ本体１６Ａにボルト等によって取付く円盤状のクランプ本体１７Ａと、このクランプ本体１７Ａに連なりかつ前記折返されたブラダ側部３１をインナクランプ１６との間で狭圧して保持する狭持部２０とを具える。又アウタクランプ１７には、前記狭持部２０から半径方向外方に向かって軸方向内向きに傾斜してのびる案内面２１Ｓを有する案内部２１を介して前記ビード支持部１１が形成される。なお本例では、前記案内面２１Ｓが、曲率半径５０ｍｍ以上、好ましくは８０ｍｍ以上の大きな凸円弧で形成され、ビード部４をビード支持部１１に滑らかに案内するものを例示しているが、傾斜面であっても良い。   Further, in this example, the outer clamp 17 includes a disc-shaped clamp body 17A attached to the clamp body 16A with a bolt or the like, and the bladder side portion 31 that is connected to the clamp body 17A and folded back to the inner clamp 16. And a holding portion 20 that holds the pressure between them. Further, the bead support portion 11 is formed on the outer clamp 17 via a guide portion 21 having a guide surface 21 </ b> S extending from the pinching portion 20 inward in the radial direction outward in the radial direction. In this example, the guide surface 21S is formed by a large convex arc having a radius of curvature of 50 mm or more, preferably 80 mm or more, and smoothly guides the bead part 4 to the bead support part 11. It may be a surface.

又前記ビード支持部１１は、前記案内面２１Ｓに滑らかに連なりかつビード部４の底面を着座させて保持する着座面１１Ａと、この着座面１１Ａの軸方向内端から半径方向外方に立上がり前記ビード部４の内側面と当接することで前記ビード部４を位置決めする当接面１１Ｂとを具える。なお該ビード支持部１１は、前記凸部１９の上方に位置するとともに、このビード支持部１１と凸部１９との間には、前記ブラダ胴部３０が通る隙間Ｄが形成される。又前記クランプ本体１６Ａ、１７Ａの一方には、空気供給源に接続され、該空気供給源からの空気供給によりゴムブラダー１２を膨張させる空気流路を設けている。   The bead support portion 11 is smoothly connected to the guide surface 21S and seated on the bottom surface of the bead portion 4 to hold it, and rises radially outward from the axially inner end of the seating surface 11A. A contact surface 11B for positioning the bead portion 4 by contacting the inner surface of the bead portion 4 is provided. The bead support portion 11 is located above the convex portion 19, and a gap D through which the bladder trunk portion 30 passes is formed between the bead support portion 11 and the convex portion 19. One of the clamp bodies 16A and 17A is provided with an air flow path that is connected to an air supply source and expands the rubber bladder 12 by supplying air from the air supply source.

そして本実施形態では、前記アウタクランプ１７に、前記ビード支持部１１から向き合う側（軸方向内側）に突出する延長部２３を形成している。   In the present embodiment, the outer clamp 17 is formed with an extension portion 23 that protrudes to the side facing the bead support portion 11 (inward in the axial direction).

この延長部２３は、前記ゴムブラダー１２が膨張する際の外表面と当接して、該ゴムブラダー１２における膨張部１２Ａの根元部分１２Ａ１を絞ることができる。その結果、図１に示すように、この膨張部１２Ａに押圧されてトロイド状に膨張する生タイヤ基体２に、そのトレッド側外面の半径Ｒ１（タイヤ軸を含む子午断面における半径Ｒ１）を、前記トレッドリング３のタイヤ赤道付近３ｃの内面の半径Ｒ２よりも小に減じた減径膨張部２４を形成することができる。そしてこの減径膨張部２４の形成により、図４（Ａ）〜（Ｃ）に示すように、生タイヤ基体２とトレッドリング３とがドッキングする際、まず始めに前記減径膨張部２４の頂部２４ｃを、前記トレッドリング３のタイヤ赤道付近３ｃと当接せしめ、しかる後、接触位置をショルダ側に次第に移動させることが可能となり、これによって、トレッドリング３と生タイヤ基体２との間のエアー溜まりの発生を防止しうるとともに、トレッドリング３の外端３ｅが先に生タイヤ基体２に接触することに起因する、該外端３ｅの噛み込み、及びトレッドリング３と生タイヤ基体２とのセンターずれなどを抑制しうる。   The extension 23 abuts on the outer surface of the rubber bladder 12 when it is inflated, and can narrow down the root portion 12A1 of the inflatable portion 12A of the rubber bladder 12. As a result, as shown in FIG. 1, the raw tire base 2 that is pressed by the inflating portion 12A and expands in a toroidal shape has a radius R1 (radius R1 in a meridional section including the tire axis) of the tread side outer surface. A diameter-reduced expansion portion 24 that is smaller than the radius R2 of the inner surface of the tire equator vicinity 3c of the tread ring 3 can be formed. When the green tire base 2 and the tread ring 3 are docked by the formation of the reduced diameter expansion part 24, as shown in FIGS. 4A to 4C, first, the top of the reduced diameter expansion part 24 is formed. 24 c is brought into contact with the tire equator vicinity 3 c of the tread ring 3, and then the contact position can be gradually moved toward the shoulder, whereby the air between the tread ring 3 and the green tire base body 2 can be moved. The occurrence of accumulation can be prevented, and the outer end 3e of the tread ring 3 comes into contact with the raw tire base 2 first, and the engagement of the outer end 3e and the tread ring 3 and the raw tire base 2 Center deviation can be suppressed.

なお図４（Ａ）は、ビード部４、４を接近させながら、例えば１００ｋＰａ以下、好ましくは４０〜８０ｋＰａの低内圧を充填し、ゴムブラダー１２を膨張させる初期状態を示している。このとき、ゴムブラダー１２の膨張部１２Ａは、その根元部分１２Ａ１が前記延長部２３によって絞られる。そのため、この膨張部１２Ａに押圧されて膨張する生タイヤ基体２の膨張部を、トレッドリング３との接触に先がけて、そのトレッド側外面の半径Ｒ１が、前記トレッドリング３のタイヤ赤道付近３ｃの内面の半径Ｒ２よりも小さい減径膨張部２４として形成することができる。   FIG. 4A shows an initial state in which the rubber bladder 12 is expanded by filling the bead portions 4 and 4 with a low internal pressure of, for example, 100 kPa or less, preferably 40 to 80 kPa. At this time, the base portion 12A1 of the inflating portion 12A of the rubber bladder 12 is squeezed by the extension portion 23. Therefore, prior to contact with the tread ring 3, the inflated portion of the raw tire base body 2 that is pressed and inflated by the inflating portion 12A has a radius R1 of the outer surface of the tread side of the tire equator vicinity 3c of the tread ring 3. It can be formed as a reduced diameter expansion portion 24 smaller than the radius R2 of the inner surface.

又図４（Ｂ）は、ビード部４、４を所定位置Ｑの近傍までさらに近接させた状態を示し、Ｒ１＜Ｒ２ であることにより、まず最初に前記減径膨張部２４の頂部２４ｃがトレッドリング３のタイヤ赤道付近３ｃで当接する。   FIG. 4B shows a state in which the bead portions 4 and 4 are brought closer to the vicinity of the predetermined position Q. When R1 <R2, first, the top 24c of the reduced diameter expansion portion 24 is tread. The ring 3 abuts at the tire equator vicinity 3c.

又図４（Ｃ）は、ビード部４、４を所定位置Ｑまでさらに近接させるとともに、充填内圧を例えば１００ｋＰａより大、好ましくは１３０〜２５０ｋＰａまで上昇させた状態を示す。この充填内圧の上昇により、前記膨張部１２Ａは、その根元部分１２Ａ１よりも半径方向外側において丸く膨らもうとし、軸方向外側にも大きく膨出する。即ち、膨張部１２Ａの軸方向巾Ｗ１が、延長部２３、２３間の軸方向距離Ｗ２を越えて増大し、前記接触位置がショルダ側に移動することにより、前記減径膨張部２４は、トレッドリング３のショルダー部３ｓ内面とも接触できる。   FIG. 4C shows a state in which the bead portions 4 and 4 are brought closer to the predetermined position Q and the filling internal pressure is increased to, for example, 100 kPa, preferably 130 to 250 kPa. Due to the increase in the filling internal pressure, the expanding portion 12A tends to swell rounder on the radially outer side than the root portion 12A1, and swells greatly on the axially outer side. That is, when the axial width W1 of the expansion portion 12A increases beyond the axial distance W2 between the extension portions 23 and 23, and the contact position moves to the shoulder side, the reduced diameter expansion portion 24 becomes tread. The inner surface of the shoulder 3s of the ring 3 can also be contacted.

このとき、前記膨張部１２Ａの軸方向最外端部位置は、トレッドリング３の外端３ｅからトレッドリング３の内面と直交する向きにのびる法線ｎに対し、該法線ｎを越えて軸方向外側に突出していることが好ましい。これは、前記最外端部位置が少なくとも前記法線ｎを軸方向外側に越えていれば、ビード部４の側で、生タイヤ基体２とゴムブラダー１２との間に空洞Ｈが発生している場合にも、生タイヤ基体２をトレッドリング３の外端３ｅまで確実に押し付けることができるからである。本例ではこの状態で、周知のステッチャー装置によるステッチャー工程を行い、トレッドリング３を生タイヤ基体２により強固に圧着し接合している。   At this time, the position of the axially outermost end portion of the inflating portion 12A is such that the normal line n extends from the outer end 3e of the tread ring 3 in a direction perpendicular to the inner surface of the tread ring 3 and exceeds the normal line n. It is preferable to protrude outward in the direction. This is because a cavity H is generated between the raw tire base 2 and the rubber bladder 12 on the bead portion 4 side when the outermost end position exceeds at least the normal line n outward in the axial direction. In this case, the raw tire base 2 can be reliably pressed to the outer end 3e of the tread ring 3. In this example, in this state, a stitcher process using a known stitcher device is performed, and the tread ring 3 is firmly pressed and bonded to the raw tire base 2.

なお前記延長部２３による本願の作用効果を有効に発揮させるためには、前記当接面１１Ｂからの、前記延長部２３の軸方向の突出長さＷ（図３に示す）を、１０〜６５ｍｍの範囲とするのが好ましい。１０ｍｍ未満では、Ｒ１＜Ｒ２ とすることが難しく、エアー溜まりの発生や、トレッドリング外端での噛み込み等の抑制効果を充分に発揮することができなくなる。又６５ｍｍを越えると、ゴムブラダー１２が絞り過ぎとなって、前記空洞Ｈが過大となり、生タイヤ基体２をトレッドリング３の外端３ｅ下まで充分に押し付けることができなくなる。従って、前記突出長さＷの下限値を１５ｍｍ以上、上限値を６０ｍｍ以下とするのがより好ましい。   In order to effectively exert the effect of the present application by the extension 23, the length W (shown in FIG. 3) of the extension 23 in the axial direction from the contact surface 11B is set to 10 to 65 mm. It is preferable to be in the range. If it is less than 10 mm, it is difficult to satisfy R1 <R2, and it is impossible to sufficiently exhibit the effect of suppressing the occurrence of air accumulation and the biting at the outer end of the tread ring. If it exceeds 65 mm, the rubber bladder 12 is excessively squeezed, the cavity H becomes excessive, and the raw tire base 2 cannot be sufficiently pressed down to the lower end 3 e of the tread ring 3. Therefore, it is more preferable that the lower limit value of the protrusion length W is 15 mm or more and the upper limit value is 60 mm or less.

以上、本発明の特に好ましい実施形態について詳述したが、本発明は図示の実施形態に限定されることなく、種々の態様に変形して実施しうる。例えばフォーマ１０において、アウタクランプ１７を主軸１５に支持させ、インナクランプ１６をアウタクランプ１７に取り付ける構成、及び一方のクランプ体１３を固定し、他方のクランプ体１３のみを接近移動可能に支持する構成、及びビード支持部１１を拡径可能とする構成など適宜に採用することができる。又前記延長部２３を取り替え自在とし、タイヤサイズやカテゴリに応じて突出長さＷを変化させることもできる。   As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect. For example, in the former 10, the outer clamp 17 is supported on the main shaft 15, the inner clamp 16 is attached to the outer clamp 17, and one clamp body 13 is fixed, and only the other clamp body 13 is supported so as to be movable. And the structure which makes the bead support part 11 diameter-expandable etc. are employable suitably. Further, the extension 23 can be replaced freely, and the protruding length W can be changed according to the tire size and category.

図３に示す構造をなしかつ表１の仕様のクランプ具を有するフォーマを用いて形成した生タイヤを加硫成形し、自動二輪車用タイヤ（１８０／５５ＺＲ１７）を試作した。そして各１００本の試供タイヤにおける、トレッドリング外端での噛み込みに起因するベアの発生数、及びトレッドリングと生タイヤ基体との間のエアー溜まりの発生数を評価した。   A raw tire formed using a former having the structure shown in FIG. 3 and having a clamp of the specifications shown in Table 1 was vulcanized to produce a motorcycle tire (180 / 55ZR17). Then, the number of bears generated due to biting at the outer end of the tread ring and the number of air pools between the tread ring and the green tire base in each of 100 sample tires were evaluated.

なおトレッドリングは、その内面における、タイヤ軸方向の内面巾ＴＷを１６５ｍｍ、内面半径Ｒ２を９８ｍｍ、かつ内面直径Ｄを６１１ｍｍとしている。   The tread ring has an inner surface width TW in the tire axial direction of 165 mm, an inner surface radius R2 of 98 mm, and an inner surface diameter D of 611 mm.

（１）ベアの発生数：
トレッドゴムとサイドウォールゴムとの境界位置におけるゴム流れ不良によるベア（凹状の傷）の発生の有無を目視によって検査した。タイヤ外表面に１ｍｍ以上の長さのベアが、タイヤ片側に２個以上有るものをベア発生とした。 (1) Number of bears generated:
The presence or absence of occurrence of bears (concave scratches) due to defective rubber flow at the boundary position between the tread rubber and the sidewall rubber was inspected visually. A bear having a length of 1 mm or more on the outer surface of the tire and two or more bears on one side of the tire was regarded as being generated.

（２）エアー溜まりの発生数：
加硫成形後のタイヤにおいて、エアー溜まりに起因するトレッド面の局部的な膨出変形の有無を、トレッド面ゲージを用いて目視検査し、膨出変形が１ヶ所以上あるものをエアー溜まりの発生とした。 (2) Number of air pools:
In the tire after vulcanization molding, the tread surface is visually inspected for the presence of local bulging deformation due to air accumulation, and a tread surface gauge is used for visual inspection. It was.

Figure 2005262743
Figure 2005262743

表１の如く、実施例のクランプ具を用いて形成した生タイヤでは、トレッドリングと生タイヤ基体との間のエアー溜まりの発生や、トレッドリング外端の噛み込み等が効果的に抑制されているのが確認できる。   As shown in Table 1, in the raw tire formed using the clamping device of the example, the occurrence of air accumulation between the tread ring and the raw tire base, the biting of the outer end of the tread ring, and the like are effectively suppressed. It can be confirmed.

本発明のタイヤ製造方法における第２成形の一実施例を説明する断面図である。It is sectional drawing explaining one Example of the 2nd shaping | molding in the tire manufacturing method of this invention. それに用いるゴムブラダーの無負荷の自然状態を例示する断面図である。It is sectional drawing which illustrates the unloaded natural state of the rubber bladder used for it. クランプ具を拡大して示す部分断面図である。It is a fragmentary sectional view which expands and shows a clamp tool. （Ａ）〜（Ｃ）は、本発明の作用効果を説明する線図である。(A)-(C) are the diagrams explaining the effect of this invention. 本発明の製造方法によって形成されたタイヤの一例を示す断面図である。It is sectional drawing which shows an example of the tire formed by the manufacturing method of this invention. （Ａ）、（Ｂ）は、従来技術及びその問題点を説明する線図である。(A), (B) is a diagram explaining a prior art and its problem.

符号の説明Explanation of symbols

１ 生タイヤ
２ 生タイヤ基体
３ トレッドリング
３ｃ タイヤ赤道付近
３ｓ ショルダ部
４ ビード部
１０ フォーマ
１１ ビード支持部
１１Ａ 着座面
１１Ｂ 当接面
１２ ゴムブラダ
１２Ａ 膨張部
１２Ａ１ 根元部分
１４ クランプ具
１６ インナクランプ
１７ アウタクランプ
２３ 延長部
２４ 減径膨張部 DESCRIPTION OF SYMBOLS 1 Raw tire 2 Raw tire base | substrate 3 Tread ring 3c Tire equator vicinity 3s Shoulder part 4 Bead part 10 Former 11 Bead support part 11A Seating surface 11B Abutting surface 12 Rubber bladder 12A Expansion part 12A1 Root part 14 Clamp tool 16 Inner clamp 17 Outer clamp 23 Extension part 24 Reduced diameter expansion part

Claims (5)

フォーマにより保持された生タイヤ基体と、該生タイヤ基体の半径方向外側に配置されかつ生タイヤ基体のトロイド状の膨張とともにこの生タイヤ基体に一体に貼着されるトレッドリングとにより生タイヤを形成する第２成形を有する２ステージ成型法による生タイヤを用いたタイヤ製造方法であって、
前記第２成形には、前記フォーマによりビード部がロックされた円筒状の生タイヤ基体を、前記ビード部間の軸方向への接近移動とともにその内面を押圧してトロイド状に膨張させるゴムブラダが用いられ、
かつ該ゴムブラダは、このゴムブラダの向き合う各内側面を保持する両側のインナクランプと、各外側面を保持する両側のアウタクランプとからなるクランプ具により気密に固定されるとともに、
前記クランプ具に、このクランプ具から向き合う側に突出し前記ゴムブラダに当接しうる延長部を形成し、該延長部により前記ゴムブラダの膨張に際しての膨張部の根元部分を絞ることによって、タイヤ軸を含む子午断面において、前記生タイヤ基体のトレッド側の半径Ｒ１を、前記トレッドリングのタイヤ赤道付近の内面の半径Ｒ２よりも小に減じた減径膨張部を生タイヤ基体に形成することを特徴とするタイヤ製造方法。 A raw tire is formed by a raw tire base held by a former and a tread ring that is disposed radially outside the raw tire base and is integrally attached to the raw tire base together with a toroidal expansion of the raw tire base. A tire manufacturing method using a raw tire by a two-stage molding method having a second molding,
In the second molding, a rubber bladder is used that expands a cylindrical raw tire base body, whose bead portion is locked by the former, in the axial direction between the bead portions and presses the inner surface thereof to form a toroid. And
And the rubber bladder is hermetically fixed by a clamp tool composed of inner clamps on both sides for holding the inner side surfaces of the rubber bladder and outer clamps on both sides for holding the outer side surfaces,
An extension portion is formed on the clamp tool so as to protrude from a side facing the clamp tool so as to contact the rubber bladder. By the extension portion, a root portion of the expansion portion when the rubber bladder is expanded is squeezed. A tire having a reduced-diameter inflating portion formed by reducing a radius R1 on the tread side of the green tire base in a cross section to be smaller than a radius R2 of an inner surface near the tire equator of the tread ring is formed on the green tire base. Production method. 前記ビード部は、前記アウタクランプの外周面に形成されかつ前記ビード部の底面が着座する着座面とビード部の内側面が当接する当接面とを有するビード支持部にロックされるとともに、該アウタクランプに前記延長部を形成したことを特徴とする請求項１記載のタイヤ製造方法。   The bead portion is locked to a bead support portion formed on an outer peripheral surface of the outer clamp and having a seating surface on which a bottom surface of the bead portion is seated and an abutting surface on which an inner surface of the bead portion abuts, The tire manufacturing method according to claim 1, wherein the extension portion is formed in an outer clamp. 前記減径膨張部と前記トレッドリングのショルダ部の内面とは、前記減径膨張部の頂部が前記トレッドリングのタイヤ赤道付近で当接した後、接触位置がショルダ側に移動することにより、前記減径膨張部とトレッドリングのショルダ部の内面とが接触することを特徴とする請求項１又は２記載のタイヤ製造方法。   The inner diameter of the reduced diameter expansion part and the inner surface of the shoulder part of the tread ring is such that the top of the reduced diameter expansion part abuts in the vicinity of the tire equator of the tread ring, and then the contact position moves to the shoulder side. The tire manufacturing method according to claim 1 or 2, wherein the reduced diameter expansion portion and the inner surface of the shoulder portion of the tread ring are in contact with each other. 前記延長部は、前記ビード支持部の当接面からの軸方向の突出長さＷを１０〜６５ｍｍとしたことを特徴とする請求項２記載のタイヤ製造方法。   3. The tire manufacturing method according to claim 2, wherein the extension portion has an axial projection length W of 10 to 65 mm from the contact surface of the bead support portion. 前記タイヤは自動二輪車用タイヤであることを特徴とする請求項１〜４の何れかに記載のタイヤ製造方法。   The tire manufacturing method according to claim 1, wherein the tire is a motorcycle tire.
JP2004080891A 2004-03-19 2004-03-19 Method for manufacturing motorcycle tire Expired - Fee Related JP4490712B2 (en)

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RU2455163C1 (en) * 2010-12-03 2012-07-10 Федеральное государственное унитарное предприятие "Научно-производственное предприятие "Прогресс" (ФГУП "НПП "Прогресс") Method of producing rubber-cord shells

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JPS50157475A (en) * 1974-06-13 1975-12-19
JPS5247877A (en) * 1975-10-15 1977-04-16 Mitsubishi Heavy Ind Ltd Tire molding apparatus
JPS57212046A (en) * 1981-06-24 1982-12-27 Yokohama Rubber Co Ltd:The Second stage green tire molding drum
JPH03126534A (en) * 1989-10-13 1991-05-29 Yokohama Rubber Co Ltd:The Molding method of radial tire
JP2003118011A (en) * 2001-10-10 2003-04-23 Sumitomo Rubber Ind Ltd Method and apparatus for manufacturing pneumatic tire

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Publication number Priority date Publication date Assignee Title
JPS50157475A (en) * 1974-06-13 1975-12-19
JPS5247877A (en) * 1975-10-15 1977-04-16 Mitsubishi Heavy Ind Ltd Tire molding apparatus
JPS57212046A (en) * 1981-06-24 1982-12-27 Yokohama Rubber Co Ltd:The Second stage green tire molding drum
JPH03126534A (en) * 1989-10-13 1991-05-29 Yokohama Rubber Co Ltd:The Molding method of radial tire
JP2003118011A (en) * 2001-10-10 2003-04-23 Sumitomo Rubber Ind Ltd Method and apparatus for manufacturing pneumatic tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455163C1 (en) * 2010-12-03 2012-07-10 Федеральное государственное унитарное предприятие "Научно-производственное предприятие "Прогресс" (ФГУП "НПП "Прогресс") Method of producing rubber-cord shells

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