JP4841516B2 - Pneumatic tire and manufacturing method thereof - Google Patents

Pneumatic tire and manufacturing method thereof Download PDF

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JP4841516B2
JP4841516B2 JP2007207858A JP2007207858A JP4841516B2 JP 4841516 B2 JP4841516 B2 JP 4841516B2 JP 2007207858 A JP2007207858 A JP 2007207858A JP 2007207858 A JP2007207858 A JP 2007207858A JP 4841516 B2 JP4841516 B2 JP 4841516B2
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tire
rubber
carcass ply
bead
buttress portion
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JP2009040237A (en
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兼一 山下
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Priority to PCT/JP2008/057722 priority patent/WO2009019912A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/72—Side-walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/30—Applying the layers; Guiding or stretching the layers during application
    • B29D30/3028—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum axis, to form an annular element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/58—Applying bands of rubber treads, i.e. applying camel backs
    • B29D30/60—Applying bands of rubber treads, i.e. applying camel backs by winding narrow strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
    • B60C13/02—Arrangement of grooves or ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0025—Modulus or tan delta

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Tyre Moulding (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Description

本発明は、泥濘路、砂利道、未舗装路などの悪路の走行を目的とした空気入りタイヤ及びその製造方法に関し、より詳細には、悪路走行時に接地するバットレス部に突起を備え悪路での性能が向上された空気入りタイヤ及びその製造方法に関する。   The present invention relates to a pneumatic tire intended for traveling on rough roads such as mud roads, gravel roads, and unpaved roads, and a method for manufacturing the same. The present invention relates to a pneumatic tire with improved road performance and a method for manufacturing the same.

悪路の走行を目的とする空気入りタイヤでは、平坦な道路を走行しているときは接地しないバットレス部に突起を設けている。凹凸があり平坦でない悪路を走行する場合、突起が路面と接触するので、悪路での駆動性能や制動性能が向上する。   In a pneumatic tire intended for traveling on a rough road, a protrusion is provided on a buttress portion that does not contact when traveling on a flat road. When running on rough roads with unevenness and unevenness, the projections come into contact with the road surface, so that driving performance and braking performance on rough roads are improved.

一方、特許文献１には、リムプロテクターバーと呼ばれる、ビード側のサイドウォールに設けられた突起物を備えた空気入りタイヤの製造方法が開示されている。この製造方法では、生タイヤを拡径する前に、成型ドラムに貼り付けられた生タイヤに、突起物を形成する帯状のゴムを巻き付けている。
特開２００６−３０５８９１号公報（図１） On the other hand, Patent Document 1 discloses a method for manufacturing a pneumatic tire including a protrusion provided on a bead side sidewall, which is called a rim protector bar. In this manufacturing method, before expanding the diameter of the raw tire, a belt-like rubber forming a protrusion is wound around the raw tire attached to the molding drum.
JP 2006-305891 A (FIG. 1)

上記のタイヤでバットレス部に悪路を走行する場合、十分な駆動性能や制動性能を得るため、所定の空気圧より低くして、バットレス部の突起を積極的に接地させることがある。バットレス部の突起は、サイドウォールゴムから成型されているので、十分なグリップを得ることができず、バットレス部が悪路路面から損傷を受けやすく耐久性が低下する問題もあった。   When traveling on a bad road to the buttress portion with the tire described above, in order to obtain sufficient driving performance and braking performance, the protrusion of the buttress portion may be positively grounded at a pressure lower than a predetermined air pressure. Since the protrusion of the buttress portion is molded from the sidewall rubber, a sufficient grip cannot be obtained, and there is a problem that the buttress portion is easily damaged from a rough road surface and durability is lowered.

特許文献１の製造方法により、バットレス部に突起を備えた空気入りタイヤを製造する場合、バットレス部のゴムの厚さ均一にならず、ゴムの厚さが薄い箇所が発生する。これは、生タイヤを拡径する際、バットレス部の拡径率がビード付近に比べて大きいためである。   When a pneumatic tire having protrusions on the buttress portion is manufactured by the manufacturing method of Patent Document 1, the rubber thickness of the buttress portion is not uniform, and a portion having a small rubber thickness is generated. This is because the diameter expansion rate of the buttress portion is larger than that in the vicinity of the bead when expanding the diameter of the raw tire.

バットレス部にゴムの厚さが薄い箇所があると、ダイナミックアンバランスの原因となりタイヤの性能が低下する。また、カーカスプライのコードの密度が密な部分と疎な部分ができるので、タイヤの耐久性が低下するという問題点がある。   If there is a thin rubber part in the buttress part, it will cause dynamic imbalance and tire performance will be reduced. Further, since the density of the carcass ply cord is dense and sparse, there is a problem that the durability of the tire is lowered.

本発明の目的は、ダイナミックアンバランスが低減され、耐久性が高められた空気入りタイヤを製造する方法を提供することにある。   An object of the present invention is to provide a method for manufacturing a pneumatic tire with reduced dynamic imbalance and increased durability.

本願発明の空気入りタイヤは、ビードコアとビードフィラーを備えた一対のビードと、端部が各ビードを巻き上げるように折り返されてトロイダル状に成形されたカーカスプライと、前記カーカスプライのサイド部を覆うサイドウォールゴムと、前記カーカスプライのクラウン部を覆うトレッドゴムとを備えた空気入りタイヤであって、
トレッドゴムのショルダー部はスクエア形状であって、
バッドレス部に突起を備え、前記トレッドゴム及び前記突起の抗張積は１５０００〜１８０００（ＭＰａ・％）であり、前記サイドウォールゴムの抗張積は１００００〜１２０００（ＭＰａ・％）であることを特徴とする。 The pneumatic tire of the present invention covers a pair of beads provided with a bead core and a bead filler, a carcass ply that is folded back so that each bead winds up each bead, and formed into a toroidal shape, and covers a side portion of the carcass ply A pneumatic tire comprising a sidewall rubber and a tread rubber covering a crown portion of the carcass ply,
The tread rubber shoulder has a square shape,
Protrusions are provided in the paddle part, the tensile product of the tread rubber and the projections is 15000 to 18000 (MPa ·%), and the tensile product of the sidewall rubber is 10,000 to 12000 (MPa ·%) Features.

バッドレス部に設けられた突起の抗張積は、トレッドゴムと同様に、サイドウォールゴムよりも大きいので、当該突起が接地した際には、十分なグリップが発生する。その結果、悪路で十分な駆動性能や制動性能を得ることができる。また、突起を含むバットレス部は路面からの損傷を受けにくくなるので、タイヤの耐久性も向上する。なお、本願では、抗張積は、２５℃で測定された値を言う。   As the tread rubber, the tensile product of the protrusion provided on the padless portion is larger than that of the sidewall rubber, so that a sufficient grip is generated when the protrusion is grounded. As a result, sufficient driving performance and braking performance can be obtained on rough roads. Further, since the buttress portion including the protrusion is less susceptible to damage from the road surface, the durability of the tire is also improved. In the present application, the tensile product refers to a value measured at 25 ° C.

本願発明タイヤは、バッドレス部に突起を備えた空気入りタイヤの製造方法であって、
成形ドラムにインナーライナーを貼り付け、前記インナーライナーの外側にカーカスプライを貼り付け、ビードコアとビードフィラーを備えた一対のビードを前記カーカスプライの両端に載置し、前記カーカスプライの端部が各ビードを巻き上げるように前記カーカスプライの両端を折り返し、
前記カーカスプライの外側に、加硫後の抗張積が１００００〜１２０００（ＭＰａ・％）であるサイドウォールゴムを貼り付け、
前記成形ドラムを拡径した後、前記カーカスプライのクラウン部に相当する位置の外側にベルト層及び加硫後の抗張積が１５０００〜１８０００（ＭＰａ・％）であるトレッドゴムを貼り付けて、生タイヤを成形し、
前記生タイヤのバットレス部に、加硫後の抗張積が１５０００〜１８０００（ＭＰａ・％）である帯状ゴム部材を貼り付けて環状突起部を形成し、前記生タイヤを金型で加硫成型することで製造される。 The tire of the present invention is a method for manufacturing a pneumatic tire provided with a projection on a paddle part,
An inner liner is affixed to the molding drum, a carcass ply is affixed to the outside of the inner liner, a pair of beads having a bead core and a bead filler are placed on both ends of the carcass ply, and the ends of the carcass ply Fold both ends of the carcass ply to wind up the bead,
A sidewall rubber having a tensile product after vulcanization of 10,000 to 12000 (MPa ·%) is attached to the outside of the carcass ply,
After expanding the diameter of the molding drum, a belt layer and a tread rubber having a tensile product after vulcanization of 15,000 to 18000 (MPa ·%) are attached to the outside of the position corresponding to the crown portion of the carcass ply, Molding raw tires,
A band-shaped rubber member having a tensile product after vulcanization of 15,000 to 18000 (MPa ·%) is pasted on the buttress portion of the green tire to form an annular protrusion, and the green tire is vulcanized with a mold. It is manufactured by doing .

本願発明タイヤは、バッドレス部に突起を備えた空気入りタイヤの製造方法であって、
成形ドラムにインナーライナーを貼り付け、前記インナーライナーの外側にカーカスプライを貼り付け、ビードコアとビードフィラーを備えた一対のビードを前記カーカスプライの両端に載置し、前記カーカスプライの端部が各ビードを巻き上げるように前記カーカスプライの両端を折り返し、
前記カーカスプライの外側に、加硫後の抗張積が１００００〜１２０００（ＭＰａ・％）であるサイドウォールゴムを貼り付け、
前記成形ドラムを拡径した後、前記カーカスプライのクラウン部に相当する位置の外側にベルト層及び加硫後の抗張積が１５０００〜１８０００（ＭＰａ・％）であるトレッドゴムを貼り付けて、生タイヤを成形し、
前記生タイヤのバットレス部に、加硫後の抗張積が１５０００〜１８０００（ＭＰａ・％）であるリボン状ゴム部材を複数回巻きつけて環状突起部を形成し、前記生タイヤを金型で加硫成型することで製造される。 The tire of the present invention is a method for manufacturing a pneumatic tire provided with a projection on a paddle part,
An inner liner is affixed to the molding drum, a carcass ply is affixed to the outside of the inner liner, a pair of beads having a bead core and a bead filler are placed on both ends of the carcass ply, and the ends of the carcass ply Fold both ends of the carcass ply to wind up the bead,
A sidewall rubber having a tensile product after vulcanization of 10000 to 12000 (MPa ·%) is attached to the outside of the carcass ply,
After expanding the diameter of the molding drum, a belt layer and a tread rubber having a tensile product after vulcanization of 15,000 to 18000 (MPa ·%) are attached to the outside of the position corresponding to the crown portion of the carcass ply, Molding raw tires,
A ribbon-like rubber member having a tensile product after vulcanization of 15,000 to 18000 (MPa ·%) is wound around the buttress portion of the green tire a plurality of times to form an annular protrusion, and the green tire is molded with a mold. Manufactured by vulcanization molding.

本願発明の製造方法では、生タイヤを拡径した後にバットレス部に環状突起部を設けているので、環状突起部の厚さが変化することなく形成される。その結果、成型後のタイヤにおいて、ダイナミックアンバランスが低減される。カーカスプライのコードの密度が密な部分と疎な部分が発生せず、タイヤの耐久性が低下することがない。また、成型するバットレス部に成型された突起により、悪路での駆動性能や制動性能が向上する。   In the manufacturing method of the present invention, since the annular protrusion is provided in the buttress portion after expanding the raw tire, the thickness of the annular protrusion is not changed. As a result, dynamic imbalance is reduced in the molded tire. The dense and sparse portions of the carcass ply cord are not generated, and the durability of the tire is not lowered. Further, the driving performance and braking performance on rough roads are improved by the projections molded on the buttress portion to be molded.

以下、図面を用いて、本発明に係る空気入りタイヤの製造方法の実施の形態を説明する。まず、図１（ａ）において、成形ドラム１の円筒側面にインナープライ１１とカーカスプライ１２が貼り付けられている。カーカスプライ１２の両端には、ビードコア１３とビードフィラー１４からなる、一対のビード１５が配置され、カーカスプライ１２の両端は、ビード１５を巻き上げるように折り曲げられている。インナープライ１１とカーカスプライ１２の成形ドラム１への貼り付け、ビード１５の巻上げは、公知の製造方法で行なうことができる。次に、図１（ｂ）に示すように、サイドウォールゴム１７を貼り付けて、拡径前の生タイヤＧが完成する。なお、カーカスプライ１２は必要に応じて枚数を増やしてもよい。また、その他必要な部材を拡径前に貼り付けておいてもよい。   Hereinafter, an embodiment of a method for manufacturing a pneumatic tire according to the present invention will be described with reference to the drawings. First, in FIG. 1A, an inner ply 11 and a carcass ply 12 are attached to the cylindrical side surface of the forming drum 1. A pair of beads 15 including a bead core 13 and a bead filler 14 are disposed at both ends of the carcass ply 12, and both ends of the carcass ply 12 are bent so as to wind up the beads 15. The inner ply 11 and the carcass ply 12 can be attached to the forming drum 1 and the bead 15 can be wound up by a known manufacturing method. Next, as shown in FIG.1 (b), the side wall rubber 17 is affixed and the raw tire G before diameter expansion is completed. Note that the number of carcass plies 12 may be increased as necessary. Further, other necessary members may be pasted before the diameter expansion.

図２は、拡径された生タイヤＧを示す断面図である。拡径は、公知の拡径ドラム（図示しない）で行なわれる。拡径された生タイヤＧのカーカスプライ１２のクラウン部に相当する位置の外側にベルト層１９及びトレッドゴム１８を貼り付けて、次いで生タイヤＧのバットレス部Ｂに、断面が三角形である帯状ゴム部材２１を周方向に貼り付ける。したがって、図３に示すように、帯状ゴム部材２１を貼り付けた後の生タイヤＧでは、バットレス部に環状突起部２２が形成される。その後、生タイヤＧは金型（図示しない）により加硫成型される。このとき、金型のバットレス部を成型する成型面に所定の形状の凹部を設けることにより、生タイヤＧのバットレス部に所望の形状の突起が形成される。なお、帯状ゴム部材２１は、成型するバットレス部の突起の形状により、その断面形状を適宜変更することができる。なお、ベルト層１９は必要に応じて枚数を増やしてもよい。   FIG. 2 is a cross-sectional view showing the raw tire G having an enlarged diameter. The diameter expansion is performed with a known diameter expansion drum (not shown). The belt layer 19 and the tread rubber 18 are attached to the outside of the position corresponding to the crown portion of the carcass ply 12 of the enlarged raw tire G, and then the belt-like rubber having a triangular cross section on the buttress portion B of the raw tire G The member 21 is pasted in the circumferential direction. Therefore, as shown in FIG. 3, in the raw tire G after the band-shaped rubber member 21 is attached, the annular protrusion 22 is formed in the buttress portion. Thereafter, the raw tire G is vulcanized by a mold (not shown). At this time, by providing a recess having a predetermined shape on the molding surface for molding the buttress portion of the mold, a protrusion having a desired shape is formed on the buttress portion of the raw tire G. Note that the cross-sectional shape of the belt-like rubber member 21 can be appropriately changed depending on the shape of the projection of the buttress portion to be molded. The number of belt layers 19 may be increased as necessary.

生タイヤＧを拡径した後にバットレス部に環状突起部２２を設けているので、環状突起部２２の厚さが変化することなく形成される。その結果、成型後のタイヤにダイナミックアンバランスが低減される。カーカスプライ１２のコードの密度が密な部分と疎な部分が発生せず、タイヤの耐久性が低下することがない。また、成型するバットレス部に成型された突起により、悪路での駆動性能や制動性能が向上する。   Since the annular protrusion 22 is provided in the buttress portion after expanding the raw tire G, the thickness of the annular protrusion 22 is formed without changing. As a result, dynamic imbalance is reduced in the molded tire. Neither the dense part nor the sparse part of the cord density of the carcass ply 12 is generated, and the durability of the tire is not lowered. Further, the driving performance and braking performance on rough roads are improved by the projections molded on the buttress portion to be molded.

図４は、拡径された生タイヤＧを示す断面図である。成形された生タイヤＧのバットレス部に、リボン状ゴム部材３１を複数回巻きつけて、環状突起部３２が形成されている。その後、同様に生タイヤＧは金型（図示しない）により加硫成型され、バットレス部に所望の形状の突起が形成される。   FIG. 4 is a cross-sectional view showing the raw tire G having an enlarged diameter. An annular protrusion 32 is formed by winding a ribbon-like rubber member 31 a plurality of times around the buttress portion of the molded green tire G. Thereafter, similarly, the green tire G is vulcanized and molded by a mold (not shown) to form a protrusion having a desired shape on the buttress portion.

突起を設けようとするバットレス部の半径方向外側と内側では直径が異なるので、帯状ゴム部材２１を貼り付ける場合、帯状ゴム部材２の縁部に皺が発生しやすく、空気が入ったり、ゴムの流れが悪くなることがある。しかし、リボン状ゴム部材３１を巻きつけることにより、皺が発生することなく環状突起部３２を形成することができる。なお、リボン状ゴム部材３１の寸法は特に限定されないが、幅１５ｍｍ〜３５ｍｍ、厚さ１．０ｍｍ〜３．０ｍｍが好ましい。   Since the diameter is different between the radially outer side and the inner side of the buttress portion where the protrusion is to be provided, when the belt-like rubber member 21 is attached, wrinkles are likely to occur at the edge of the belt-like rubber member 2, and air may enter or The flow may worsen. However, by winding the ribbon-like rubber member 31, the annular protrusion 32 can be formed without generating wrinkles. In addition, although the dimension of the ribbon-shaped rubber member 31 is not specifically limited, 15 mm-35 mm in width and 1.0 mm-3.0 mm in thickness are preferable.

本願でバットレス部とは、図５に示すようにトレッド幅方向接地端Ｅから、タイヤ半径方向内側に向かって、タイヤ断面で最大幅となる位置Ｗまでの範囲をいう。また、バットレス部の突起とは、間隔をおいて配置された突起のほか，環状に連なる突条も含むものとする。   In the present application, the buttress portion refers to a range from the tread width direction grounding end E to the position W where the tire cross-section has the maximum width inward in the tire radial direction as shown in FIG. Further, the protrusions of the buttress portion include not only protrusions arranged at intervals, but also annular protrusions.

なお、加硫後において、帯状ゴム部材２１やリボン状ゴム部材３１及びトレッドゴム１８の抗張積が１５０００〜１８０００（ＭＰａ・％）、サイドウォールゴム１７の抗張積が１００００〜１２０００（ＭＰａ・％）となるように、各ゴム部材の組成を調製しておくことが好ましい。突起３０が接地した際には、十分なグリップが発生する。その結果、悪路で十分な駆動性能や制動性能を得ることができる。また、突起３０を含むバットレス部Ｂは路面からの損傷を受けにくくなるので、タイヤの耐久性も向上する。   After vulcanization, the tensile product of the belt-like rubber member 21, the ribbon-like rubber member 31, and the tread rubber 18 is 15,000 to 18000 (MPa ·%), and the tensile product of the sidewall rubber 17 is 10,000 to 12000 (MPa · %), It is preferable to prepare the composition of each rubber member. When the protrusion 30 is grounded, a sufficient grip is generated. As a result, sufficient driving performance and braking performance can be obtained on rough roads. Further, since the buttress portion B including the protrusions 30 is not easily damaged from the road surface, the durability of the tire is also improved.

上記の抗張積を実現するための各ゴム部材の組成は、公知の組成で構わない。一般に、ゴム成分中の天然ゴムの成分比を高くしたり、高比表面積のカーボンブラックやシリカを多く配合することにより抗張積が高いゴムを実現することができる。   The composition of each rubber member for realizing the above tensile product may be a known composition. Generally, a rubber having a high tensile product can be realized by increasing the component ratio of natural rubber in the rubber component, or by blending a large amount of carbon black or silica having a high specific surface area.

実施例タイヤとしてバッドレス部に突起を備えた空気入りタイヤを本発明に係る製造方法により製造し、評価した。実施例１は、生タイヤを拡径した後にバットレス部に帯状ゴム部材（断面形状は、上辺３５ｍｍ、下辺１００ｍｍ、高さ９ｍｍの台形である。）を貼り付けて環状突起部を形成し、その後加硫成型したタイヤである。実施例２は、生タイヤを拡径した後にバットレス部にリボン状ゴム部材（幅２５ｍｍ、厚さ１．５ｍｍ）を１６回巻きつけて環状突起部を形成し、その後加硫成型したタイヤである。比較例１は、バットレス部に突起のないタイヤ、比較例２、４は実施例１、２と同じ突起を有するタイヤで、生タイヤを拡径する前（図１（ｂ）に相当する状態）にバットレス部に相当する位置に帯状ゴム部材（断面形状は、上辺３５ｍｍ、下辺１００ｍｍ、高さ１３ｍｍの台形である。）を貼り付けて、その後生タイヤを拡径し加硫成型したタイヤである。比較例３、５は実施例１、２と同じ突起を有するタイヤで、生タイヤを拡径する前（図１（ｂ）に相当する状態）にバットレス部に相当する位置にリボン状ゴム部材（実施例２と同じ）を２５回巻きつけて、その後生タイヤを拡径し加硫成型したタイヤである。   As an example tire, a pneumatic tire provided with a protrusion on a padless portion was manufactured and evaluated by the manufacturing method according to the present invention. In Example 1, after expanding the diameter of the raw tire, a band-shaped rubber member (the cross-sectional shape is a trapezoid having an upper side of 35 mm, a lower side of 100 mm, and a height of 9 mm) is pasted on the buttress portion to form an annular protrusion, and then This is a vulcanized tire. Example 2 is a tire obtained by expanding a green tire and then winding a ribbon-like rubber member (width: 25 mm, thickness: 1.5 mm) around the buttress part 16 times to form an annular protrusion, followed by vulcanization molding. . Comparative Example 1 is a tire having no protrusions on the buttress portion, Comparative Examples 2 and 4 are tires having the same protrusions as in Examples 1 and 2, and before expanding the raw tire (a state corresponding to FIG. 1B) A belt-like rubber member (a cross-sectional shape is a trapezoid having an upper side of 35 mm, a lower side of 100 mm, and a height of 13 mm) is attached to a position corresponding to the buttress portion, and then the raw tire is expanded in diameter and vulcanized. . Comparative Examples 3 and 5 are tires having the same protrusions as in Examples 1 and 2, and a ribbon-like rubber member (in a position corresponding to the buttress portion) before expanding the diameter of the raw tire (a state corresponding to FIG. 1B). The same tire as in Example 2 was wound 25 times, and then the raw tire was expanded and vulcanized.

環状突起部を形成するゴム部材の体積をほぼ等しくするために、拡径前にゴム部材を貼り付け又は巻きつけする場合と、拡径後にする場合では、帯状ゴム部材の高さ、又は、リボン状ゴム部材の巻き数を変化させている。   In order to make the volume of the rubber member forming the annular protrusion substantially equal, the height of the belt-like rubber member or the ribbon is applied when the rubber member is attached or wound before the diameter expansion and after the diameter expansion. The number of turns of the rubber member is changed.

なお、図５に示すように、バットレス部Ｂに形成された突起３０は、周方向幅１１０ｍｍ、半径方向幅５０ｍｍ、突起高さ１５ｍｍで、間隔３０ｍｍでタイヤ周方向環状に配置されている。なお、帯状ゴム部材及びリボン状ゴム部材は、サイドウォールゴムと同じ組成のゴムを使用した。いずれのタイヤのサイズもＬＴ３１５／７５Ｒ１６であった。また、実施例１、２、比較例２、３では帯状ゴム部材及びリボン状ゴム部材は、トレッドゴムと同じ組成のゴムを使用した。比較例４、５では帯状ゴム部材及びリボン状ゴム部材は、サイドウォールゴムと同じ組成のゴムを使用した。各ゴムの組成は表１のとおりであった。   As shown in FIG. 5, the protrusions 30 formed on the buttress portion B are arranged in an annular shape in the tire circumferential direction with a circumferential width of 110 mm, a radial width of 50 mm, a protrusion height of 15 mm, and an interval of 30 mm. In addition, the rubber | gum of the same composition as side wall rubber was used for the strip | belt-shaped rubber member and the ribbon-shaped rubber member. The size of any tire was LT315 / 75R16. In Examples 1 and 2 and Comparative Examples 2 and 3, the belt-like rubber member and the ribbon-like rubber member used rubber having the same composition as the tread rubber. In Comparative Examples 4 and 5, the belt-like rubber member and the ribbon-like rubber member used rubber having the same composition as the sidewall rubber. The composition of each rubber was as shown in Table 1.

Figure 0004841516
Figure 0004841516

加硫成型後のトレッド、サイドウォール、突起の抗張積は表２に示す。なお、抗張積は、測定器（株式会社島津製作所製、型式：ＴＳ−１００）により、温度２５℃で測定した。   Table 2 shows the tensile product of the tread, sidewall, and protrusion after vulcanization molding. The tensile product was measured at a temperature of 25 ° C. using a measuring instrument (manufactured by Shimadzu Corporation, model: TS-100).

表２に評価結果を示す。悪路走破性は、ピックアップトラック（フォード社製、Ｆ１５０）にタイヤを装着して５ｋｍの悪路を走破するのに要した時間である。ダイナミックアンバランスは、ダイナミックバランス検査装置（国際計測器株式会社製、型式：Model FDB 6142）でダイナミックアンバランスを測定した結果である。いずれもの結果も比較例１を１００とした指数で表し、数字が大きいほど評価結果が良いことを示す。本願の製造方法により製造されたタイヤでは、悪路走破性を維持し、ダイナミックアンバランスを低減することができた。   Table 2 shows the evaluation results. The rough road running performance is the time required to drive a 5 km rough road with a tire mounted on a pickup truck (Ford F150). The dynamic unbalance is a result of measuring the dynamic unbalance with a dynamic balance inspection device (model: Model FDB 6142, manufactured by Kokusai Keiki Co., Ltd.). All the results are expressed as an index with Comparative Example 1 being 100, and the larger the number, the better the evaluation result. In the tire manufactured by the manufacturing method of the present application, it was possible to maintain the rough road running performance and reduce the dynamic imbalance.

Figure 0004841516
Figure 0004841516

本発明に係る空気入りタイヤの製造方法の各工程を示す図である。It is a figure which shows each process of the manufacturing method of the pneumatic tire which concerns on this invention. 生タイヤに環状突起部を形成する様子を示す図である。It is a figure which shows a mode that an annular projection part is formed in a green tire. 環状突起部が形成された生タイヤを示す図である。It is a figure which shows the green tire in which the annular protrusion part was formed. 環状突起部が形成された生タイヤを示す図である。It is a figure which shows the green tire in which the annular protrusion part was formed. 実施例・比較例のタイヤの突起を示す図である。It is a figure which shows the protrusion of the tire of an Example and a comparative example.

符号の説明Explanation of symbols

１ 成形ドラム
１１ インナーライナー
１２ カーカスプライ
１３ ビードコア
１４ ビードフィラー
１５ ビード
１７ サイドウォールゴム
１８ トレッドゴム
１９ ベルト層
３０ 突起 DESCRIPTION OF SYMBOLS 1 Molding drum 11 Inner liner 12 Carcass ply 13 Bead core 14 Bead filler 15 Bead 17 Side wall rubber 18 Tread rubber 19 Belt layer 30 Protrusion

Claims (1)

ビードコアとビードフィラーを備えた一対のビードと、端部が各ビードを巻き上げるように折り返されてトロイダル状に成形されたカーカスプライと、前記カーカスプライのサイド部を覆うサイドウォールゴムと、前記カーカスプライのクラウン部を覆うトレッドゴムとを備えた空気入りタイヤであって、
トレッドゴムのショルダー部はスクエア形状であって、
バッドレス部に突起を備え、前記トレッドゴム及び前記突起の抗張積は１５０００〜１８０００（ＭＰａ・％）であり、前記サイドウォールゴムの抗張積は１００００〜１２０００（ＭＰａ・％）であることを特徴とする空気入りタイヤ。 A pair of beads including a bead core and a bead filler, a carcass ply that is folded back so that each bead winds up each bead, and a sidewall rubber that covers a side portion of the carcass ply, and the carcass ply A pneumatic tire provided with a tread rubber covering the crown portion of
The tread rubber shoulder has a square shape,
Protrusions are provided in the paddle part, the tensile product of the tread rubber and the projections is 15,000 to 18000 (MPa ·%), and the tensile product of the sidewall rubber is 10,000 to 12000 (MPa ·%) A featured pneumatic tire.
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