JP2011031446A - Method for manufacturing tire, and tire - Google Patents

Method for manufacturing tire, and tire Download PDF

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JP2011031446A
JP2011031446A JP2009178780A JP2009178780A JP2011031446A JP 2011031446 A JP2011031446 A JP 2011031446A JP 2009178780 A JP2009178780 A JP 2009178780A JP 2009178780 A JP2009178780 A JP 2009178780A JP 2011031446 A JP2011031446 A JP 2011031446A
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reinforcing layer
tire
belt reinforcing
tread
rubber strip
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JP5320201B2 (en
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Norio Imayama
則生 今山
Akihiro Tsuzura
章広 廿楽
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress occurrence of air entry between a belt reinforcing layer and a tread when a rubber strip is laminated on the belt reinforcing layer formed in a divided state to form the tread having a base part and a cap part. <P>SOLUTION: The belt reinforcing layer 80 is divided in its width direction and reinforcing members 82 are superposed on the belt reinforcing layer 80 at the divided position D of the belt reinforcing layer 80 to be formed on the outer periphery of an object to be molded. Rubber strips G1 are laminated on the belt reinforcing layer 80 excepting the non-laminated range H including level differences of the superposed part of the belt reinforcing layer 80 and a base part 11 is formed without covering the superposed part of the belt reinforcing layer 80. Rubber strips G2 are successively superposed and laminated along the outer periphery of the base part 11 to form a cap part 12. The lamination interval of the rubber strips G2 is altered during the formation of the cap part 12 and made narrower than another range in the non-laminated range H of the base part 11 and the rubber strips G2 large in angle of lamination are laminated on the belt reinforcing layer 80. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ベルト補強層にゴムストリップを積層してトレッドを形成し、未加硫タイヤを成形するタイヤ製造方法と、このタイヤ製造方法により製造されたタイヤに関する。   The present invention relates to a tire manufacturing method in which a rubber strip is laminated on a belt reinforcing layer to form a tread, and an unvulcanized tire is molded, and a tire manufactured by the tire manufacturing method.

空気入りタイヤ等のタイヤでは、ベルトと外周面のトレッドとの間に、タイヤ周方向に延びるコードを有するベルト補強層を配置し、ベルトを補強して高速耐久性等のタイヤ性能を向上させることが行われている。また、従来、トレッドに、発熱性が高く厚さの薄い内面側のベース部と、トレッド性能に主に寄与する外面側のキャップ部とを設け、要求性能を確保したタイヤが使用されている。   In a tire such as a pneumatic tire, a belt reinforcing layer having a cord extending in the tire circumferential direction is disposed between the belt and the tread of the outer peripheral surface, and the belt is reinforced to improve tire performance such as high-speed durability. Has been done. Conventionally, a tire is used which has a tread with a base portion on the inner surface side, which has high heat generation and a small thickness, and a cap portion on the outer surface side which mainly contributes to the tread performance, and ensures required performance.

ところで、ベルト補強層を形成する際、コードをゴムで被覆等した補強部材の巻き付け手段を複数設け、被成形体に複数の補強部材を同時に螺旋状に巻き付けてベルト補強層を形成する装置が知られている(特許文献1参照)。
また、従来、リボン状のゴムストリップを螺旋状に巻き付けて積層し、ベース部、及び、その外周に重なるキャップ部を順に形成して、トレッドを所定の断面形状及び構造に形成するタイヤ製造方法が知られている(特許文献2参照)。
By the way, there is known an apparatus for forming a belt reinforcing layer by providing a plurality of reinforcing member winding means for covering a cord with rubber or the like and forming a belt reinforcing layer by simultaneously winding a plurality of reinforcing members spirally around a molded object. (See Patent Document 1).
Further, conventionally, there is a tire manufacturing method in which a ribbon-shaped rubber strip is wound in a spiral shape and laminated, and a base portion and a cap portion that overlaps the outer periphery thereof are sequentially formed to form a tread in a predetermined cross-sectional shape and structure. It is known (see Patent Document 2).

図5は、このようにベルト補強層とトレッドを形成する従来のタイヤ製造方法の例を示す模式図であり、タイヤ幅方向断面の要部を拡大して示している。
ここでは、図示のように、未加硫タイヤ成形の所定段階で、ベルト71を配置した被成形体70の外周に、ベルト補強層80とトレッド90とを順に形成する。ベルト補強層80(図5A参照)は、回転する被成形体70に対して、サイド部72から所定幅の補強部材の巻き付けを開始し(矢印M1)、同時に、タイヤ赤道面CL付近からも補強部材の巻き付けを開始する(矢印M2)。このように、ベルト補強層80を幅方向に分割し、それぞれ補強部材を螺旋状に巻き付けて形成し、その分割位置Dで、分割形成したベルト補強層80A、80Bの補強部材同士を重ねて、1つのベルト補強層80を被成形体70に形成する。
FIG. 5 is a schematic view showing an example of a conventional tire manufacturing method for forming a belt reinforcing layer and a tread in this manner, and shows an enlarged main part of a tire width direction cross section.
Here, as shown in the figure, a belt reinforcing layer 80 and a tread 90 are sequentially formed on the outer periphery of the molded body 70 on which the belt 71 is disposed at a predetermined stage of unvulcanized tire molding. The belt reinforcing layer 80 (see FIG. 5A) starts winding a reinforcing member having a predetermined width from the side portion 72 around the rotating molded body 70 (arrow M1), and at the same time, reinforces from the vicinity of the tire equatorial plane CL. The winding of the member is started (arrow M2). In this way, the belt reinforcing layer 80 is divided in the width direction, and the reinforcing members are respectively wound in a spiral shape, and at the dividing position D, the reinforcing members of the belt reinforcing layers 80A and 80B that are separately formed are overlapped, One belt reinforcing layer 80 is formed on the molded body 70.

これに対し、トレッド90(図5B参照)は、ベース部91のゴムストリップを、回転する被成形体70のサイド部72間に亘って螺旋状に連続して巻き付け(矢印M3)、ベルト補強層80の外周全体に積層して、ベース部91が形成される。続いて、ベース部91の外周に沿って、キャップ部92のゴムストリップを螺旋状に巻き付けて順に積層し(矢印M4)、キャップ部92を形成して、トレッド90の形成が完了する。   On the other hand, the tread 90 (see FIG. 5B) continuously wraps the rubber strip of the base portion 91 spirally between the side portions 72 of the rotating molded body 70 (arrow M3). A base portion 91 is formed by laminating the entire outer periphery of 80. Subsequently, along the outer periphery of the base portion 91, the rubber strip of the cap portion 92 is spirally wound and laminated in order (arrow M4), the cap portion 92 is formed, and the formation of the tread 90 is completed.

図6は、このように形成したベルト補強層80とトレッド90を示す要部断面図であり、タイヤ赤道面CLを中心にした一部を模式的に示している。また、図7は、図6のZ範囲を拡大して模式的に示す断面図である。
このベルト補強層80は、図示のように、複数本(図では6本)の並列したコード81(図7参照)を未加硫ゴムで被覆した帯状の補強部材82からなり、補強部材82を側面を当接させてタイヤ周方向に沿って巻き付け、2層積層して形成される。その際、2つの補強部材82を同時に巻き付け、ベルト補強層80を幅方向に分割して形成することで、ベルト補強層80を効率的に形成して形成時間を短縮している。ただし、この場合には、分割形成したベルト補強層80A、80B間に隙間ができるのを防止するため、分割位置Dで各補強部材82を重ね合わせる必要があり、ベルト補強層80A、80Bの重ねた部分に段差が生じる。
FIG. 6 is a main part sectional view showing the belt reinforcing layer 80 and the tread 90 formed as described above, and schematically shows a part around the tire equatorial plane CL. FIG. 7 is a sectional view schematically showing the Z range of FIG. 6 in an enlarged manner.
As shown in the figure, the belt reinforcing layer 80 is composed of a belt-like reinforcing member 82 in which a plurality (six in the figure) of parallel cords 81 (see FIG. 7) are covered with unvulcanized rubber. The side surfaces are brought into contact with each other and wound along the tire circumferential direction to form two layers. At that time, the two reinforcing members 82 are wound simultaneously, and the belt reinforcing layer 80 is divided and formed in the width direction, whereby the belt reinforcing layer 80 is efficiently formed and the formation time is shortened. However, in this case, in order to prevent a gap from being formed between the separately formed belt reinforcing layers 80A and 80B, it is necessary to overlap the reinforcing members 82 at the dividing position D, and the belt reinforcing layers 80A and 80B are overlapped. There is a difference in level.

トレッド90(図6参照)は、このベルト補強層80の外周に、ゴムストリップG1、G2(G1にはハッチングを付す)を互いに重ね合わせて積層して、ベース部91とキャップ部92が順に形成される。その際、ベース部91とキャップ部92は、ゴム成形の無駄を省く等のため、同じ幅に成形されたゴムストリップG1、G2により形成され、ベース部91では、ゴムストリップG1の積層間隔を広くして、その重なり幅と積層角度を小さくし、ゲージ(厚さ)が薄く形成される。一方、キャップ部92では、ゴムストリップG2の積層間隔を狭くして、その重なり幅と積層角度を大きくし、ゲージを厚くして、トレッド90を必要なゴムゲージに形成する。   In the tread 90 (see FIG. 6), rubber strips G1 and G2 (G1 is hatched) are stacked on each other on the outer periphery of the belt reinforcing layer 80, and a base portion 91 and a cap portion 92 are sequentially formed. Is done. At this time, the base portion 91 and the cap portion 92 are formed by rubber strips G1 and G2 formed to have the same width in order to eliminate waste of rubber molding. In the base portion 91, the lamination interval of the rubber strips G1 is widened. Then, the overlap width and the stacking angle are reduced, and the gauge (thickness) is formed thin. On the other hand, in the cap portion 92, the tread 90 is formed in a necessary rubber gauge by narrowing the stacking interval of the rubber strips G2, increasing the overlap width and stacking angle, and increasing the gauge.

ところが、以上のようにトレッド90を形成すると、ベース部91のゴムストリップG1がタイヤ幅方向に沿うように配置され、この相対的に幅が広いゴムストリップG1により、上記したベルト補強層80A、80Bの重ねた部分の段差が覆われることがある。その結果、段差が埋まらずに、幅広なゴムストリップG1により、ベルト補強層80の分割位置の重ねた部分(図7参照)にエアが閉じ込められて、段差付近に空隙Vが生じる虞がある。また、このように空隙Vが生じると、ゴムストリップG1によりエアの排出が妨げられて、エアが溜まり易くなる虞もある。従って、ベルト補強層80とトレッド90間のエア入りの発生を抑制する観点から、トレッド90のゴムゲージの不足を防止しつつ、エアの閉じ込めに対処することが求められている。   However, when the tread 90 is formed as described above, the rubber strip G1 of the base portion 91 is disposed along the tire width direction, and the belt reinforcing layers 80A and 80B described above are formed by the relatively wide rubber strip G1. The steps of the overlapped parts may be covered. As a result, air is trapped in the overlapping portion (see FIG. 7) where the belt reinforcing layer 80 is divided by the wide rubber strip G1 without filling the step, and there is a possibility that a gap V is generated near the step. In addition, when the air gap V is generated in this way, the rubber strip G1 prevents air from being discharged, and air may easily accumulate. Therefore, from the viewpoint of suppressing the occurrence of air entering between the belt reinforcing layer 80 and the tread 90, it is required to cope with air confinement while preventing the rubber gauge of the tread 90 from being insufficient.

特開平7−314574号公報JP-A-7-314574 特開2006−130880号公報JP 2006-130880 A

本発明は、このような従来の問題に鑑みなされたものであって、その目的は、分割形成したベルト補強層にゴムストリップを積層してベース部とキャップ部とを有するトレッドを形成するとき、トレッドのゴムゲージを確保しつつ、ベルト補強層の分割位置の重ねた部分にエアが閉じ込められるのを防止し、ベルト補強層とトレッド間のエア入りの発生を抑制することである。   The present invention has been made in view of such conventional problems, and its purpose is to form a tread having a base portion and a cap portion by laminating a rubber strip on a separately formed belt reinforcing layer. While securing the rubber gauge of the tread, it is to prevent air from being trapped in the overlapped portion of the belt reinforcing layer and to suppress the occurrence of air entering between the belt reinforcing layer and the tread.

本発明は、被成形体の外周にベルト補強層を挟んでゴムストリップを積層し、ベース部とキャップ部とを有するトレッドを形成して未加硫タイヤを成形するタイヤ製造方法であって、ベルト補強層を幅方向に分割して、かつ、分割位置で互いに重ねて被成形体の外周に形成する工程と、ベルト補強層の少なくとも重ねた部分を覆わずに、ベルト補強層にゴムストリップを積層してベース部を形成する工程と、ベース部の外周に沿って、ゴムストリップを順次重ね合わせて積層してキャップ部を形成する工程と、キャップ部の形成中にゴムストリップの積層間隔を変更し、ベース部のゴムストリップを積層していない範囲で他の範囲よりも積層間隔を狭くする工程と、を有することを特徴とする。
また、本発明は、ゴムストリップにより形成されたトレッドを備えたタイヤであって、幅方向に分割して、かつ、分割位置で互いに重ねて形成され、トレッドの内側に配置されたベルト補強層を備え、トレッドが、ベルト補強層の少なくとも重ねた部分を覆わずに、ベルト補強層にゴムストリップを積層して形成されたベース部と、ベース部の外周に沿ってゴムストリップを順次重ね合わせて積層して形成され、ベース部のゴムストリップを積層していない範囲のゴムストリップの積層間隔が他の範囲の積層間隔よりも狭いキャップ部と、を有することを特徴とする。
The present invention relates to a tire manufacturing method for forming an unvulcanized tire by forming a tread having a base portion and a cap portion by laminating rubber strips with a belt reinforcing layer sandwiched around the outer periphery of a molded body, The step of dividing the reinforcing layer in the width direction and overlapping each other at the dividing position to form the outer periphery of the molded body, and laminating the rubber strip on the belt reinforcing layer without covering at least the overlapped portion of the belt reinforcing layer Forming the base part, forming a cap part by sequentially laminating and laminating rubber strips along the outer periphery of the base part, and changing the lamination interval of the rubber strips during the formation of the cap part. And a step of narrowing the stacking interval in the range where the rubber strip of the base portion is not stacked, compared to other ranges.
Further, the present invention is a tire provided with a tread formed of a rubber strip, and is divided into a width direction and overlapped with each other at a division position, and a belt reinforcing layer disposed inside the tread is provided. Provided, the tread does not cover at least the overlapped portion of the belt reinforcing layer, and the base portion formed by laminating the rubber strip on the belt reinforcing layer and the rubber strip are sequentially laminated along the outer periphery of the base portion. And a cap portion in which the rubber strips in the range where the rubber strips in the base portion are not laminated are narrower than the lamination intervals in the other ranges.

本発明によれば、分割形成したベルト補強層にゴムストリップを積層してベース部とキャップ部とを有するトレッドを形成するとき、トレッドのゴムゲージを確保しつつ、ベルト補強層の分割位置の重ねた部分にエアが閉じ込められるのを防止でき、ベルト補強層とトレッド間のエア入りの発生を抑制できる。   According to the present invention, when forming a tread having a base portion and a cap portion by laminating rubber strips on the separately formed belt reinforcing layer, the belt reinforcing layer is divided at the divided positions while ensuring the rubber gauge of the tread. Air can be prevented from being trapped in the portion, and the occurrence of air entering between the belt reinforcing layer and the tread can be suppressed.

本実施形態のタイヤ製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the tire manufacturing method of this embodiment. 本実施形態のタイヤ製造方法により形成したベルト補強層とトレッドを示す要部断面図である。It is principal part sectional drawing which shows the belt reinforcement layer and tread which were formed with the tire manufacturing method of this embodiment. 図2のY範囲を拡大して示す断面図である。It is sectional drawing which expands and shows the Y range of FIG. 積層間隔を変更して積層したゴムストリップを模式的に示す断面図である。It is sectional drawing which shows typically the rubber strip laminated | stacked by changing the lamination | stacking space | interval. 従来のタイヤ製造方法の例を示す模式図である。It is a schematic diagram which shows the example of the conventional tire manufacturing method. 従来のベルト補強層とトレッドの例を示す要部断面図である。It is principal part sectional drawing which shows the example of the conventional belt reinforcement layer and a tread. 図6のZ範囲を拡大して示す断面図である。It is sectional drawing which expands and shows the Z range of FIG.

以下、本発明のタイヤ製造方法とタイヤの一実施形態について、図面を参照して説明する。
本実施形態のタイヤ製造方法では、被成形体の外周にベルト補強層を挟んでゴムストリップを積層し、ベース部とキャップ部とを有するトレッド(トレッドゴム)を形成して未加硫タイヤを成形する。その際、ここでは、上記と同様に、ベルト補強層を、複数本の並列したコードを未加硫ゴムで被覆した帯状の補強部材により形成する。また、トレッドのベース部とキャップ部を、互いに異なる種類や特性のゴムからなり、同じ幅に成形された各ゴムストリップにより形成する。
Hereinafter, a tire manufacturing method and a tire according to an embodiment of the present invention will be described with reference to the drawings.
In the tire manufacturing method of the present embodiment, a rubber strip is laminated on the outer periphery of the molded body, and a tread (tread rubber) having a base portion and a cap portion is formed to form an unvulcanized tire. To do. At this time, in the same manner as described above, the belt reinforcing layer is formed by a band-shaped reinforcing member in which a plurality of parallel cords are covered with unvulcanized rubber. Further, the base portion and the cap portion of the tread are formed of rubber strips made of different types and characteristics of rubber and molded to the same width.

ここで、被成形体は、例えば、成形途中段階の未加硫タイヤ、タイヤケース等の中間成形体、又は、タイヤからトレッドを取り除いた更生前の台タイヤであり、タイヤ成形の所定段階でベルト補強層とトレッドが形成される。ただし、被成形体は、ベルトとトレッドの組立体を成形する成形ドラムであってもよく、その構成は特に限定されず、少なくともベルト補強層とトレッドを形成する対象物であればよい。被成形体が成形ドラムであるときには、成形後のベルト・トレッド組立体を、その内側に配置される他の部材の外周に接合等して未加硫タイヤが成形される。また、未加硫タイヤは、未加硫のトレッドが設けられたタイヤであり、生タイヤに加えて、新たに未加硫のトレッドを配置した加硫前の更生タイヤを含む。以下では、成形途中段階の未加硫タイヤにベルト補強層とトレッドを形成して、生タイヤを成形する場合を例に採り説明する。   Here, the molded body is, for example, an unvulcanized tire in the middle of molding, an intermediate molded body such as a tire case, or a base tire before rehabilitation from which the tread is removed from the tire, and the belt is formed at a predetermined stage of tire molding. A reinforcing layer and a tread are formed. However, the molding object may be a molding drum for molding an assembly of a belt and a tread, and its configuration is not particularly limited as long as it is an object that forms at least a belt reinforcing layer and a tread. When the molded body is a molding drum, an unvulcanized tire is molded by bonding the molded belt / tread assembly to the outer periphery of another member disposed inside the molded body. The unvulcanized tire is a tire provided with an unvulcanized tread, and includes a retreaded tire before vulcanization in which an unvulcanized tread is newly arranged in addition to a raw tire. Hereinafter, a case where a raw tire is molded by forming a belt reinforcing layer and a tread on an unvulcanized tire in the middle of molding will be described as an example.

図1は、本実施形態のタイヤ製造方法を説明するための模式図であり、タイヤ幅方向断面の要部を拡大して示している。また、図2は、このタイヤ製造方法により形成したベルト補強層とトレッドを示す要部断面図であり、タイヤ赤道面CLを中心にした一部を模式的に示している。図3は、図2のY範囲を拡大して模式的に示す断面図である。   FIG. 1 is a schematic diagram for explaining the tire manufacturing method of the present embodiment, and shows an enlarged main portion of a cross section in the tire width direction. FIG. 2 is a cross-sectional view of a main part showing a belt reinforcing layer and a tread formed by this tire manufacturing method, and schematically shows a part centering on the tire equatorial plane CL. FIG. 3 is a cross-sectional view schematically showing the Y range of FIG. 2 in an enlarged manner.

このタイヤ製造方法では、図示のように、未加硫タイヤ成形の所定段階で、2層のベルト71を配置した被成形体70の外周に、補強部材82からなるベルト補強層80と、ゴムストリップG1、G2(G1にはハッチングを付す)からなるトレッド10とを順に形成する。その際、例えば、ベルト補強層80は、補強部材82の供給手段や巻付手段(図示せず)により形成され、トレッド10は、ゴムストリップG1、G2の押出機や積層手段(図示せず)により形成される。即ち、補強部材82(図2参照)は、供給手段から連続して供給されて、巻付手段の押圧ローラにより回転する被成形体70に押圧しつつ巻き付けられ、被成形体70の外面に沿って徐々に移動する押圧ローラにより、被成形体70の所定位置に圧着して配置される。また、ゴムストリップG1、G2は、押出機により未加硫ゴムを押し出して連続して成形されて、積層手段の積層ローラにより被成形体70に押圧しつつ巻き付けられ、被成形体70の外面に沿って徐々に移動する積層ローラにより、被成形体70の所定位置に圧着して積層される。本実施形態では、補強部材82の供給手段と巻付手段を2組設けて、2つの補強部材82によりベルト補強層80を形成する。また、一方のゴムストリップG1の押出機と積層手段を2組設けて、2つのゴムストリップG1によりトレッド10のベース部11を形成するとともに、1つのゴムストリップG2によりキャップ部12を形成する。   In this tire manufacturing method, as shown in the figure, at a predetermined stage of unvulcanized tire molding, a belt reinforcing layer 80 made of a reinforcing member 82 and a rubber strip are provided on the outer periphery of a molded body 70 on which two belts 71 are arranged. A tread 10 composed of G1 and G2 (G1 is hatched) is formed in order. At that time, for example, the belt reinforcing layer 80 is formed by a supplying means or a winding means (not shown) of the reinforcing member 82, and the tread 10 is an extruder or a laminating means (not shown) of the rubber strips G1 and G2. It is formed by. That is, the reinforcing member 82 (see FIG. 2) is continuously supplied from the supply means, wound around the object 70 to be rotated by the pressing roller of the winding means, and wound along the outer surface of the object 70. The pressure roller that gradually moves is pressed against a predetermined position of the molded body 70 and disposed. Further, the rubber strips G1 and G2 are continuously formed by extruding unvulcanized rubber by an extruder, wound around the molding body 70 while being pressed by a laminating roller of a laminating means, and wound around the outer surface of the molding body 70. The laminated rollers that move gradually along the side are pressed and laminated at predetermined positions on the molded body 70. In the present embodiment, two sets of supplying means and winding means for the reinforcing member 82 are provided, and the belt reinforcing layer 80 is formed by the two reinforcing members 82. Further, two sets of extruders and laminating means for one rubber strip G1 are provided, and the base portion 11 of the tread 10 is formed by two rubber strips G1, and the cap portion 12 is formed by one rubber strip G2.

ベルト補強層80(図1A参照)は、被成形体70を回転手段により回転させ、その外周に対して、サイド部72から補強部材82の巻き付けを開始し(矢印M1)、同時に、タイヤ赤道面CL付近からも補強部材82の巻き付けを開始する(矢印M2)。これら2つの補強部材82を、タイヤ周方向に沿って配置しながらタイヤ幅方向に徐々に変位させ、それぞれ側面を順に当接させつつ回転する被成形体70に螺旋状に巻き付け、タイヤ赤道面CLとサイド部72まで積層する。これにより、タイヤ赤道面CLを中心にベルト補強層80を幅方向に分割して同時に形成し、これら被成形体70の外周面の異なる範囲に、それぞれ補強部材82を1層又は複数層(ここでは2層)積層する。また、タイヤ赤道面CLの分割位置D(図3参照)で、分割形成されたベルト補強層80A、80Bの補強部材82同士を重ねて、それらが一体化された1つのベルト補強層80を被成形体70に形成(図2参照)する。   The belt reinforcing layer 80 (see FIG. 1A) rotates the molding 70 by rotating means, starts winding of the reinforcing member 82 from the side portion 72 around the outer periphery (arrow M1), and at the same time, the tire equatorial plane The winding of the reinforcing member 82 is also started from the vicinity of CL (arrow M2). These two reinforcing members 82 are gradually displaced in the tire width direction while being arranged along the tire circumferential direction, and are spirally wound around the object 70 to be rotated while abutting the side surfaces in order, and the tire equatorial plane CL And the side part 72 is laminated. As a result, the belt reinforcing layer 80 is divided and formed simultaneously in the width direction around the tire equatorial plane CL, and one or more reinforcing members 82 (here, Then, two layers) are stacked. Further, at the division position D (see FIG. 3) of the tire equatorial plane CL, the reinforcement members 82 of the belt reinforcement layers 80A and 80B that are separately formed are overlapped with each other to cover one belt reinforcement layer 80 in which they are integrated. It forms in the molded object 70 (refer FIG. 2).

このように、ベルト補強層80を幅方向に2以上(ここでは2つ)に分割して、かつ、分割位置Dで側部(補強部材82)を互いに重ねて被成形体70の外周に形成し、被成形体70に、タイヤ周方向に螺旋状に延びるコード81が複数並列したベルト補強層80を配置する。次に、ベルト補強層80を形成した被成形体70の外周に、トレッド10のベルト補強層80と接する内面側のベース部11と、トレッドパターンが形成される外面側のキャップ部12を順に形成する。これにより、ベルト補強層80を含む被成形体70の外周の所定範囲に、薄いベース部11と、厚いキャップ部12とを有するトレッド10を所定形状に形成する。   In this way, the belt reinforcing layer 80 is divided into two or more (here, two) in the width direction, and the side portions (reinforcing members 82) are overlapped with each other at the dividing position D and formed on the outer periphery of the molded body 70 Then, a belt reinforcing layer 80 in which a plurality of cords 81 spirally extending in the tire circumferential direction are arranged in parallel is disposed on the molded body 70. Next, the base portion 11 on the inner surface side that contacts the belt reinforcing layer 80 of the tread 10 and the cap portion 12 on the outer surface side where the tread pattern is formed are sequentially formed on the outer periphery of the molded body 70 on which the belt reinforcing layer 80 is formed. To do. Thereby, the tread 10 having the thin base portion 11 and the thick cap portion 12 is formed in a predetermined shape in a predetermined range on the outer periphery of the molded body 70 including the belt reinforcing layer 80.

まず、ベース部11(図1B参照)は、回転する被成形体70に対して、その両サイド部72から、ベース部11を構成するゴムストリップG1の積層を開始し(矢印S1、S2)、2つのゴムストリップG1を同時に積層する。これら2つのゴムストリップG1を、タイヤ周方向に沿って配置しながらタイヤ幅方向に徐々に変位させて螺旋状に連続して巻き付け、それぞれタイヤ赤道面CL近傍まで、互いに所定範囲を重ね合わせて積層する。これにより、ベルト補強層80A、80Bの重ねた部分の段差(図3参照)を挟んで、両側にゴムストリップG1を積層し、タイヤ幅方向に分断されたベース部11A、11Bを同時に形成する。   First, the base portion 11 (see FIG. 1B) starts the lamination of the rubber strip G1 constituting the base portion 11 from both side portions 72 of the rotating molded body 70 (arrows S1 and S2). Two rubber strips G1 are laminated simultaneously. These two rubber strips G1 are arranged along the tire circumferential direction, gradually displaced in the tire width direction and continuously wound in a spiral manner, and laminated with a predetermined range overlapping each other up to the vicinity of the tire equatorial plane CL. To do. Thus, the rubber strips G1 are laminated on both sides of the stepped portion (see FIG. 3) where the belt reinforcing layers 80A and 80B are overlapped, and the base portions 11A and 11B divided in the tire width direction are simultaneously formed.

本実施形態では、このトレッド10のベース部11を被成形体70の外周に形成するとき、ベルト補強層80の所定の非積層範囲(図2、図3の範囲H)を除いて、ベルト補強層80の外周にゴムストリップG1を隙間なく積層する。非積層範囲Hは、ベルト補強層80の重ねた部分の段差を含んで、それよりも広く設定され、その範囲Hのベルト補強層80と補強部材82の重ねた部分は、ゴムストリップG1が積層されずにベース部11から露出する。このように、ベース部11を、ベルト補強層80の少なくとも重ねた部分(ここでは、少なくとも重ねた部分を含む所定範囲)を覆わずに、ベルト補強層80にゴムストリップG1を積層して形成する。   In the present embodiment, when the base portion 11 of the tread 10 is formed on the outer periphery of the molded body 70, the belt reinforcement is performed except for a predetermined non-lamination range of the belt reinforcement layer 80 (range H in FIGS. 2 and 3). The rubber strip G1 is laminated on the outer periphery of the layer 80 without any gap. The non-lamination range H includes a step of the overlapping portion of the belt reinforcing layer 80 and is set wider than that. The overlapping portion of the belt reinforcing layer 80 and the reinforcing member 82 in the range H is laminated with the rubber strip G1. Without being exposed from the base portion 11. In this manner, the base portion 11 is formed by laminating the rubber strip G1 on the belt reinforcing layer 80 without covering at least the overlapping portion of the belt reinforcing layer 80 (here, at least a predetermined range including the overlapping portion). .

その際、分断したベース部11A、11Bの対向する端部を、トレッド10(図2の上段に仮想的に二点鎖線で示す)の溝13(ここではタイヤ周方向に延びる周方向溝)が形成される位置(溝形成位置M)に対して、タイヤ幅方向の内側又は外側(ここでは内側)に位置させる。即ち、ゴムストリップG1の積層時に、ベルト補強層80の重ねた部分を挟んだ両側(図2参照)のゴムストリップG1の端部F1、F2を、トレッド10の溝形成位置Mを外して、そのタイヤ半径方向内側からずれた位置に配置する。これにより、タイヤ赤道面CL及び非積層範囲Hを挟んで、両側のゴムストリップG1の端部F1、F2と溝形成位置Mとを異なるタイヤ幅方向位置に配置し、ゴムストリップG1の積層を終了してベース部11を形成する。次に、ベース部11に重ねて、トレッド10のキャップ部12を形成する。   At that time, the opposed end portions of the divided base portions 11A and 11B are provided with grooves 13 (here, circumferential grooves extending in the tire circumferential direction) of the tread 10 (virtually indicated by a two-dot chain line in the upper part of FIG. 2). It is located inside or outside (here, inside) in the tire width direction with respect to the formed position (groove forming position M). That is, when the rubber strip G1 is laminated, the ends F1 and F2 of the rubber strip G1 on both sides (see FIG. 2) sandwiching the overlapped portion of the belt reinforcing layer 80 are removed from the groove forming position M of the tread 10, It is arranged at a position shifted from the inside in the tire radial direction. As a result, the ends F1 and F2 of the rubber strip G1 on both sides and the groove forming position M are arranged at different tire width direction positions across the tire equatorial plane CL and the non-lamination range H, and the lamination of the rubber strip G1 is completed. Thus, the base portion 11 is formed. Next, the cap part 12 of the tread 10 is formed so as to overlap the base part 11.

キャップ部12(図1B参照)は、回転する被成形体70に対して、その一方のサイド部72から、キャップ部12を構成するゴムストリップG2の積層を開始する(矢印S3)。このゴムストリップG2を、タイヤ周方向に沿って配置しながらタイヤ幅方向に徐々に変位させて螺旋状に連続して巻き付け、他方のサイド部72まで、互いに所定範囲を重ね合わせて積層する。これにより、ベース部11の外周(ゴムストリップG1を積層していない範囲を含む)に沿って、その外周の全体に亘り、ゴムストリップG2を順次重ね合わせて積層してキャップ部12を形成し、被成形体70(図2、図3参照)の外周に所定形状のトレッド10を形成する。ただし、本実施形態では、このキャップ部12の形成中にゴムストリップG2の積層間隔を変更し、ベース部11のゴムストリップG1を積層していない非積層範囲Hで他の範囲(ゴムストリップG1の積層範囲)よりも積層間隔を狭くする。   The cap part 12 (see FIG. 1B) starts the lamination of the rubber strip G2 constituting the cap part 12 from one side part 72 of the rotating molded body 70 (arrow S3). The rubber strip G <b> 2 is gradually displaced in the tire width direction while being arranged along the tire circumferential direction and continuously wound in a spiral manner, and the predetermined range is overlapped and laminated to the other side portion 72. Thereby, along the outer periphery of the base portion 11 (including the range where the rubber strip G1 is not laminated), the rubber strip G2 is sequentially overlapped and laminated over the entire outer periphery to form the cap portion 12. A tread 10 having a predetermined shape is formed on the outer periphery of the molded body 70 (see FIGS. 2 and 3). However, in the present embodiment, the stacking interval of the rubber strips G2 is changed during the formation of the cap portion 12, and the other portions (the rubber strip G1 of the rubber strip G1) are not stacked in the non-stacking range H where the rubber strip G1 of the base portion 11 is not stacked. The stacking interval is made narrower than the stacking range.

図4は、積層間隔を変更して積層したゴムストリップG1、G2を模式的に示す断面図であり、A〜Cの順に積層間隔(P1>P2>P3)が狭くなっている。
ゴムストリップG1、G2は、図示のように、幅が同じときでも、積層間隔が狭くなるほど、重なり幅と被積層面に対する積層角度とが大きくなり、積層後の全体としてのゲージ(厚さ)が厚くなる。このように、積層間隔に応じてゴムゲージを変更でき、これを利用して、ベース部11とキャップ部12の各部を、それぞれ必要な各厚さに形成する。具体的には、ベース部11(図4A参照)は、ゴムストリップG1の積層間隔P1を広くして積層角度を小さくし、ゲージT1が薄く形成される。
FIG. 4 is a cross-sectional view schematically showing the rubber strips G1 and G2 laminated by changing the lamination interval, and the lamination interval (P1>P2> P3) becomes narrower in the order of A to C.
As shown in the figure, the rubber strips G1 and G2 have the same overlap width and stacking angle with respect to the stacked surface as the stacking interval is narrow, even when the width is the same, and the gauge (thickness) as a whole after stacking is increased. Become thicker. In this way, the rubber gauge can be changed according to the stacking interval, and by using this, each part of the base part 11 and the cap part 12 is formed in each necessary thickness. Specifically, in the base portion 11 (see FIG. 4A), the lamination interval P1 of the rubber strip G1 is widened to reduce the lamination angle, and the gauge T1 is thinly formed.

これに対し、キャップ部12(図4B、図4C参照)は、ゴムストリップG2の積層間隔P2、P3を狭くして積層角度を大きくし、ゲージT2、T3が厚く形成される。また、キャップ部12は、ベース部11のゴムストリップG1の積層範囲(図4B参照)では、ゴムストリップG2を積層間隔P2でベース部11上に積層し、非積層範囲H(図4C参照)では、積層間隔P3を相対的に狭くして、ゴムストリップG2をベルト補強層80上に積層する。このように、キャップ部12では、ゴムストリップG2を、非積層範囲Hと、その前後の範囲とで積層間隔を連続して変化させて積層し、非積層範囲Hでは狭い積層間隔P3で積層して、よりゲージT3を厚くする。これにより、ベース部11のゴムストリップG1がない部分(図2、図3参照)で、キャップ部12をベース部11のゲージT1に応じて厚くし、ベース部11とキャップ部12からなるトレッド10の全体の厚さを均一にして、必要なゴムゲージに形成している。併せて、非積層範囲H(図3参照)では、ゴムストリップG2の幅方向の側部を、ベルト補強層80の表面に合わせて配置し、その段差部にそれぞれ当接させて積層する。   On the other hand, in the cap portion 12 (see FIGS. 4B and 4C), the lamination intervals P2 and P3 of the rubber strip G2 are narrowed to increase the lamination angle, and the gauges T2 and T3 are formed thick. The cap portion 12 is formed by laminating the rubber strip G2 on the base portion 11 at the lamination interval P2 in the lamination range (see FIG. 4B) of the rubber strip G1 of the base portion 11, and in the non-lamination range H (see FIG. 4C). The rubber strip G2 is laminated on the belt reinforcing layer 80 by relatively narrowing the lamination interval P3. As described above, in the cap portion 12, the rubber strip G2 is laminated with the lamination interval continuously changed between the non-lamination range H and the range before and after the non-lamination range H, and the non-lamination range H is laminated with a narrow lamination interval P3. Thus, the gauge T3 is made thicker. As a result, the cap portion 12 is thickened according to the gauge T1 of the base portion 11 at a portion where the rubber strip G1 of the base portion 11 is not present (see FIGS. 2 and 3), and the tread 10 including the base portion 11 and the cap portion 12 is formed. The entire thickness of the rubber is made uniform to form the required rubber gauge. At the same time, in the non-lamination range H (see FIG. 3), the side portions in the width direction of the rubber strip G2 are arranged in accordance with the surface of the belt reinforcing layer 80, and are laminated in contact with the step portions.

これら各工程を経て成形された未加硫タイヤは、タイヤ加硫機の加硫モールド内に収納されて加硫成型される。これにより、トレッド10に、溝13(図2参照)等からなる所定のトレッドパターンが形成されて、空気入りタイヤ等の各種のタイヤが製造される。   The unvulcanized tire molded through these steps is housed in a vulcanization mold of a tire vulcanizer and vulcanized. Thereby, the predetermined tread pattern which consists of the groove | channel 13 (refer FIG. 2) etc. is formed in the tread 10, and various tires, such as a pneumatic tire, are manufactured.

製造後のタイヤは、トレッド部に、ゴムストリップG1、G2により形成されたトレッド10を備えるとともに、幅方向に分割して、かつ、分割位置Dで互いに重ねて形成され、トレッド10の内側に配置されたベルト補強層80を備える。また、トレッド10が、ベルト補強層80の少なくとも重ねた部分を覆わずに、ベルト補強層80にゴムストリップG1を積層して形成されたベース部11と、ベース部11の外周に沿ってゴムストリップG2を順次重ね合わせて積層して形成されたキャップ部12とを有する。このベース部11は、ベルト補強層80の重ねた部分の段差を含んで設定された非積層範囲Hを除いて、ベルト補強層80にゴムストリップG1を積層して形成される。また、このタイヤでは、ベース部11は、ベルト補強層80の重ねた部分を挟んだ両側のゴムストリップG1の端部F1、F2が、トレッド10の溝形成位置Mを外して配置される。一方、キャップ部12は、ベース部11のゴムストリップG1を積層していない範囲のゴムストリップG2の積層間隔P3が他の範囲の積層間隔P2よりも狭くなっている。   The manufactured tire is provided with a tread 10 formed of rubber strips G1 and G2 in the tread portion, and is divided in the width direction and overlapped with each other at the division position D, and is disposed inside the tread 10. The belt reinforcing layer 80 is provided. Further, the tread 10 does not cover at least the overlapped portion of the belt reinforcing layer 80, and the base portion 11 formed by laminating the rubber strip G1 on the belt reinforcing layer 80, and the rubber strip along the outer periphery of the base portion 11 And a cap portion 12 formed by sequentially laminating G2. The base portion 11 is formed by laminating a rubber strip G1 on the belt reinforcement layer 80 except for a non-lamination range H that is set to include a step in the overlapping portion of the belt reinforcement layer 80. Further, in this tire, in the base portion 11, the end portions F <b> 1 and F <b> 2 of the rubber strips G <b> 1 on both sides sandwiching the overlapping portion of the belt reinforcing layer 80 are arranged with the groove forming position M of the tread 10 being removed. On the other hand, in the cap portion 12, the lamination interval P3 of the rubber strip G2 in the range where the rubber strip G1 of the base portion 11 is not laminated is narrower than the lamination interval P2 in the other range.

以上説明したように、本実施形態では、ベルト補強層80を幅方向に分割して、かつ、分割位置Dで互いに重ねて被成形体70の外周に形成するため、ベルト補強層80を隙間なく効率的に形成して形成時間を短縮できる。また、トレッド10のベース部11をベルト補強層80の重ねた部分を覆わずに形成した後、ベース部11の外周に沿って、ゴムストリップG2を順次重ね合わせて積層してキャップ部12を形成する。そのため、ベース部11のゴムストリップG1により、ベルト補強層80の重ねた部分の段差が覆われることがなく、その付近にエアが閉じ込められずに、段差付近に空隙が生じるのを防止できる。   As described above, in the present embodiment, the belt reinforcing layer 80 is divided in the width direction and overlapped with each other at the dividing position D to be formed on the outer periphery of the molded body 70. The formation time can be shortened by forming efficiently. Further, after forming the base portion 11 of the tread 10 without covering the portion where the belt reinforcing layer 80 is overlapped, the rubber strip G2 is sequentially overlapped and laminated along the outer periphery of the base portion 11 to form the cap portion 12. To do. Therefore, the rubber strip G1 of the base portion 11 does not cover the step of the overlapped portion of the belt reinforcing layer 80, and air is not confined in the vicinity thereof, and it is possible to prevent a gap from being generated in the vicinity of the step.

加えて、キャップ部12のゴムストリップG2の積層間隔を、ベース部11のゴムストリップG1を積層していない範囲で他の範囲よりも狭くすることで、上記のように、トレッド10の全体の厚さを均一にして、必要なゴムゲージに形成できる。また、積層角度が大きいゴムストリップG2の側部を、ベルト補強層80の段差部にそれぞれ当接させて積層できるため、ゴムストリップG2をベルト補強層80の表面に合わせて積層して段差を埋める効果が得られる。同時に、ベルト補強層80とキャップ部12間にエアが残っても、加硫成型時に、積層角度が大きい複数のゴムストリップG2間を通って、比較的容易にエアが外部に排出されるため、それらの間にエアが溜まるのを抑制できる。   In addition, the overall thickness of the tread 10 is reduced as described above by narrowing the stacking interval of the rubber strips G2 of the cap portion 12 in a range where the rubber strip G1 of the base portion 11 is not stacked, as described above. The thickness can be made uniform and the required rubber gauge can be formed. Further, since the side portions of the rubber strip G2 having a large lamination angle can be laminated in contact with the step portions of the belt reinforcement layer 80, the rubber strip G2 is laminated on the surface of the belt reinforcement layer 80 to fill the steps. An effect is obtained. At the same time, even if air remains between the belt reinforcing layer 80 and the cap portion 12, air is relatively easily discharged to the outside through the plurality of rubber strips G2 having a large lamination angle during vulcanization molding. It is possible to suppress the accumulation of air between them.

従って、本実施形態によれば、分割形成したベルト補強層80にゴムストリップG1、G2を積層してベース部11とキャップ部12とを有するトレッド10を形成するとき、トレッド10の必要なゴムゲージを確保して設定された断面形状に形成できる。また、ベルト補強層80の分割位置Dの重ねた部分にエアが閉じ込められるのを防止でき、ベルト補強層80とトレッド10間のエア入りの発生を抑制できる。更に、ここでは、ベルト補強層80の重ねた部分の段差を含んで非積層範囲Hを設定し、その範囲Hを除いてベルト補強層80にゴムストリップG1を積層する。その際、非積層範囲Hを、ベルト補強層80の補強部材82を重ねる範囲や位置の誤差や変動、又は、発生する段差の程度等に応じて適宜設定することで、ベルト補強層80の重ねた部分を確実に覆わずに、かつ、ゴムストリップG1を適切な範囲に積層できる。   Therefore, according to this embodiment, when the tread 10 having the base portion 11 and the cap portion 12 is formed by laminating the rubber strips G1 and G2 on the separately formed belt reinforcing layer 80, the necessary rubber gauge of the tread 10 is provided. The cross-sectional shape can be secured and set. In addition, air can be prevented from being trapped in the overlapped portion of the belt reinforcing layer 80 at the division position D, and the occurrence of air entering between the belt reinforcing layer 80 and the tread 10 can be suppressed. Further, here, a non-lamination range H is set including the step of the overlapped portion of the belt reinforcement layer 80, and the rubber strip G1 is laminated on the belt reinforcement layer 80 except for the range H. At that time, the non-lamination range H is appropriately set according to the range and position error or variation of the belt reinforcing layer 80 where the reinforcing members 82 are overlapped, or the degree of the level difference generated. The rubber strip G1 can be laminated in an appropriate range without reliably covering the covered portion.

ここで、ベース部11(図2参照)を形成する際に、ベルト補強層80の重ねた部分を挟んだ両側のゴムストリップG1の端部F1、F2を、トレッド10の溝形成位置M内に配置すると、加硫成型時に溝13の形成に伴う圧力が端部F1、F2に大きく作用する。また、溝13の形成に応じたゴムの流動の影響で、ゴムストリップG1の端部F1、F2に、位置を変動させる力が作用する。その結果、端部F1、F2が所定の配置位置から変位して、ベルト補強層80の段差部に接近し、或いは、ベース部11のゴムストリップG1のない範囲が所望範囲よりも広く、又は狭くなる虞がある。従って、ゴムストリップG1の端部F1、F2は、トレッド10の溝形成位置Mを外して配置するのが望ましい。ただし、ゴムストリップG1の端部F1、F2を溝形成位置M内に配置する必要があるときには、最も大きな力が作用する溝13の中心位置Nを外して配置することで、大きな変位の発生を抑制できる。   Here, when the base portion 11 (see FIG. 2) is formed, the end portions F1 and F2 of the rubber strips G1 on both sides sandwiching the overlapping portion of the belt reinforcing layer 80 are placed in the groove forming position M of the tread 10. If it arrange | positions, the pressure accompanying formation of the groove | channel 13 will act large on edge part F1, F2 at the time of a vulcanization molding. Further, due to the influence of the rubber flow according to the formation of the groove 13, a force for changing the position acts on the end portions F1 and F2 of the rubber strip G1. As a result, the end portions F1 and F2 are displaced from the predetermined arrangement positions to approach the stepped portion of the belt reinforcing layer 80, or the range without the rubber strip G1 of the base portion 11 is wider or narrower than the desired range. There is a risk of becoming. Therefore, it is desirable that the end portions F1 and F2 of the rubber strip G1 are arranged with the groove forming position M of the tread 10 removed. However, when it is necessary to arrange the end portions F1 and F2 of the rubber strip G1 in the groove forming position M, the center position N of the groove 13 on which the greatest force acts is removed, thereby generating a large displacement. Can be suppressed.

なお、本実施形態では、ベルト補強層80をタイヤ赤道面CLにおいて2つに分割して形成したが、ベルト補強層80は、タイヤ赤道面CL以外の位置で分割して形成してもよい。また、ベルト補強層80は、3つ以上に分割して形成してもよく、この場合には、各分割位置で、上記と同様にトレッド10のベース部11とキャップ部12を形成する。これに対し、トレッド10も、ベース部11とキャップ部12に加えて、両側部に沿って、サイド部等の他のゴム層を有するゴム部材であってもよい。   In the present embodiment, the belt reinforcing layer 80 is divided into two parts on the tire equatorial plane CL. However, the belt reinforcing layer 80 may be divided and formed at a position other than the tire equatorial plane CL. Further, the belt reinforcing layer 80 may be formed by being divided into three or more. In this case, the base portion 11 and the cap portion 12 of the tread 10 are formed in the same manner as described above at each division position. On the other hand, the tread 10 may also be a rubber member having another rubber layer such as a side portion along both side portions in addition to the base portion 11 and the cap portion 12.

(タイヤ製造試験)
本発明の効果を確認するため、以上説明したタイヤ製造方法により、ベルト補強層80とトレッド10を形成して未加硫タイヤを成形した後、加硫成型してタイヤを製造した。このタイヤを、非破壊で内部の欠陥を特定可能な検査装置(ここでは、シアログラフィー)により検査し、エア入りの有無を確認した。試験では、JATMA YEAR BOOK(2009、日本自動車タイヤ協会規格)で定めるタイヤサイズ235/35R19、及び、235/40R18の乗用車用ラジアルプライタイヤを41本と30本製造し、それぞれエア入りを検査した。試験結果を、表1に示す。
(Tire manufacturing test)
In order to confirm the effect of the present invention, the belt reinforcing layer 80 and the tread 10 were formed by the tire manufacturing method described above to form an unvulcanized tire, and then the tire was manufactured by vulcanization molding. This tire was inspected by an inspection device (here, shearography) that can identify the internal defects non-destructively, and checked for the presence of air. In the test, 41 and 30 radial ply tires for passenger cars having tire sizes 235 / 35R19 and 235 / 40R18 defined by JATMA YEAR BOOK (2009, Japan Automobile Tire Association Standard) were manufactured, and each of them was inspected for air entry. The test results are shown in Table 1.

Figure 2011031446
Figure 2011031446

その結果、表1に示すように、全てのタイヤでエア入りは発生せず、検査合格率は、それぞれ41本中41本、30本中30本で100%であった。これより、本発明により、ベルト補強層80の分割位置Dの重ねた部分にエアが閉じ込められるのを防止でき、ベルト補強層80とトレッド10間のエア入りの発生を抑制できることが証明された。   As a result, as shown in Table 1, all tires were not inflated, and the inspection pass rates were 41% for 41 tires and 30% for 30 tires, respectively. As a result, it has been proved that the present invention can prevent air from being trapped in the overlapped portion of the dividing position D of the belt reinforcing layer 80 and suppress the occurrence of air entering between the belt reinforcing layer 80 and the tread 10.

10・・・トレッド、11・・・ベース部、12・・・キャップ部、70・・・被成形体、71・・・ベルト、80・・・ベルト補強層、81・・・コード、82・・・補強部材、CL・・・タイヤ赤道面、D・・・分割位置、G1、G2・・・ゴムストリップ。   DESCRIPTION OF SYMBOLS 10 ... Tread, 11 ... Base part, 12 ... Cap part, 70 ... Molded object, 71 ... Belt, 80 ... Belt reinforcement layer, 81 ... Cord, 82. ..Reinforcing member, CL: Tire equatorial plane, D: Dividing position, G1, G2: Rubber strip.

Claims (6)

被成形体の外周にベルト補強層を挟んでゴムストリップを積層し、ベース部とキャップ部とを有するトレッドを形成して未加硫タイヤを成形するタイヤ製造方法であって、
ベルト補強層を幅方向に分割して、かつ、分割位置で互いに重ねて被成形体の外周に形成する工程と、
ベルト補強層の少なくとも重ねた部分を覆わずに、ベルト補強層にゴムストリップを積層してベース部を形成する工程と、
ベース部の外周に沿って、ゴムストリップを順次重ね合わせて積層してキャップ部を形成する工程と、
キャップ部の形成中にゴムストリップの積層間隔を変更し、ベース部のゴムストリップを積層していない範囲で他の範囲よりも積層間隔を狭くする工程と、
を有することを特徴とするタイヤ製造方法。
A tire manufacturing method for forming an unvulcanized tire by forming a tread having a base portion and a cap portion by laminating a rubber strip with a belt reinforcing layer sandwiched on the outer periphery of a molded body,
Dividing the belt reinforcing layer in the width direction and forming the belt reinforcing layer on the outer periphery of the molding by overlapping each other at the dividing position;
Forming a base portion by laminating a rubber strip on the belt reinforcing layer without covering at least the overlapped portion of the belt reinforcing layer;
A process of forming a cap portion by sequentially laminating and laminating rubber strips along the outer periphery of the base portion;
Changing the lamination interval of the rubber strip during the formation of the cap portion, and making the lamination interval narrower than the other range in a range where the rubber strip of the base portion is not laminated;
A tire manufacturing method comprising:
請求項1に記載されたタイヤ製造方法において、
ベース部を形成する工程が、ベルト補強層の重ねた部分を挟んだ両側のゴムストリップの端部を、トレッドの溝形成位置を外して配置する工程を有することを特徴とするタイヤ製造方法。
In the tire manufacturing method according to claim 1,
The tire manufacturing method characterized in that the step of forming the base portion includes the step of disposing the ends of the rubber strips on both sides sandwiching the overlapped portion of the belt reinforcing layer with the groove forming position of the tread being removed.
請求項1又は2に記載されたタイヤ製造方法において、
ベース部を形成する工程が、ベルト補強層の重ねた部分の段差を含んで設定された非積層範囲を除いて、ベルト補強層にゴムストリップを積層する工程を有することを特徴とするタイヤ製造方法。
In the tire manufacturing method according to claim 1 or 2,
The method of manufacturing a tire characterized in that the step of forming the base portion includes a step of laminating a rubber strip on the belt reinforcement layer except for a non-lamination range set including a step of the overlapped portion of the belt reinforcement layer. .
ゴムストリップにより形成されたトレッドを備えたタイヤであって、
幅方向に分割して、かつ、分割位置で互いに重ねて形成され、トレッドの内側に配置されたベルト補強層を備え、
トレッドが、ベルト補強層の少なくとも重ねた部分を覆わずに、ベルト補強層にゴムストリップを積層して形成されたベース部と、ベース部の外周に沿ってゴムストリップを順次重ね合わせて積層して形成され、ベース部のゴムストリップを積層していない範囲のゴムストリップの積層間隔が他の範囲の積層間隔よりも狭いキャップ部と、を有することを特徴とするタイヤ。
A tire with a tread formed by a rubber strip,
A belt reinforcing layer that is divided in the width direction and overlapped with each other at the dividing position and is disposed inside the tread,
The tread does not cover at least the overlapped portion of the belt reinforcement layer, and the base portion formed by laminating the rubber strip on the belt reinforcement layer and the rubber strip are sequentially laminated and laminated along the outer periphery of the base portion. A tire having a cap portion that is formed and in which a rubber strip in a range where the rubber strip of the base portion is not laminated is narrower than a lamination interval in another range.
請求項4に記載されたタイヤにおいて、
ベース部は、ベルト補強層の重ねた部分を挟んだ両側のゴムストリップの端部が、トレッドの溝形成位置を外して配置されていることを特徴とするタイヤ。
In the tire according to claim 4,
The tire is characterized in that the base portion is arranged with the ends of the rubber strips on both sides sandwiching the overlapped portion of the belt reinforcing layer being removed from the tread groove forming position.
請求項4又は5に記載されたタイヤにおいて、
ベース部が、ベルト補強層の重ねた部分の段差を含んで設定された非積層範囲を除いて、ベルト補強層にゴムストリップを積層して形成されていることを特徴とするタイヤ。
In the tire according to claim 4 or 5,
A tire characterized in that a base portion is formed by laminating a rubber strip on a belt reinforcing layer except for a non-lamination range set including a step difference in a portion where belt reinforcing layers are overlapped.
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