JP2018079736A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2018079736A
JP2018079736A JP2016221739A JP2016221739A JP2018079736A JP 2018079736 A JP2018079736 A JP 2018079736A JP 2016221739 A JP2016221739 A JP 2016221739A JP 2016221739 A JP2016221739 A JP 2016221739A JP 2018079736 A JP2018079736 A JP 2018079736A
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Prior art keywords
bead
tire
bead core
width direction
wire
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JP6804942B2 (en
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和貴 大田
Kazuki Ota
和貴 大田
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Priority to JP2016221739A priority Critical patent/JP6804942B2/en
Priority to CN201710644614.7A priority patent/CN108068560A/en
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    • 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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • 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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B60C2015/048—Polygonal cores characterised by the winding sequence

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Ropes Or Cables (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire that hardly generates bead wire jumping and hardly causes rubber separation around a bead core even when the pneumatic tire torsionally deforms.SOLUTION: A pneumatic tire includes a bead core 1 annually formed by winding a bead wire 11 a plurality of times. In the bead core 1, an initial winding end 12 of the bead wire 11 is positioned on an inside in a tire radial direction and on an inside in a tire width direction from a bead core center C and a terminal winding end 13 of the bead wire 11 is positioned on an outside in the tire radial direction and on an outside in the tire width direction from the bead core center C.SELECTED DRAWING: Figure 2

Description

本発明は空気入りタイヤに関する。   The present invention relates to a pneumatic tire.

空気入りタイヤのビードコアには、主に、シングルストランドビードと呼ばれるものと、グロメットビードと呼ばれるものがある。このうちシングルストランドビードは、１本のビードワイヤが円環状に複数周巻かれて製造されたものである（例えば特許文献１〜３参照）。   The bead core of a pneumatic tire mainly includes a so-called single strand bead and a grommet bead. Among these, the single strand bead is manufactured by winding a single bead wire in a plurality of circular shapes (see, for example, Patent Documents 1 to 3).

図４示すように、従来のシングルストランドビードとしてのビードコア１０１では、ビードワイヤの巻き終わり端１１３がタイヤ径方向外側かつタイヤ幅方向内側の角部に位置するのが一般的であった。   As shown in FIG. 4, in the bead core 101 as a conventional single strand bead, the winding end 113 of the bead wire is generally located at the corner on the tire radial direction outer side and the tire width direction inner side.

特開２０１６−８８２５８号公報Japanese Patent Laid-Open No. 2006-88258 国際公開（再公表）ＷＯ２０１２／１７６４４７号公報International Publication (Republication) WO2012 / 176447 特開平８−１０８７１４号公報JP-A-8-108714

ところで、空気入りタイヤの加硫成型中に、カーカスプライ１０３のビードコア１０１よりタイヤ幅方向内側の部分にタイヤ径方向外側に向かう力が加わり（この力が加わる方向を図４に矢印で示す）、カーカスプライ１０３がタイヤ径方向外側へずれるいわゆるプライずれが生じることがある。上記のようにビードワイヤの巻き終わり端１１３がタイヤ径方向外側かつタイヤ幅方向内側の角部に位置する場合は、プライずれが生じるとビードワイヤの巻き終わり端１１３がカーカスプライ１０３に引っ張られてタイヤ径方向外側へ浮き上がるいわゆるビードワイヤージャンピングが生じることがあった。   By the way, during the vulcanization molding of the pneumatic tire, a force toward the outer side in the tire radial direction is applied to the inner portion in the tire width direction from the bead core 101 of the carcass ply 103 (the direction in which this force is applied is indicated by an arrow in FIG. 4). There may be a so-called ply shift in which the carcass ply 103 is shifted outward in the tire radial direction. As described above, when the winding end 113 of the bead wire is located at the outer corner in the tire radial direction and the inner corner in the tire width direction, when the ply deviation occurs, the winding end 113 of the bead wire is pulled by the carcass ply 103 and the tire diameter So-called bead wire jumping that floats outward in the direction may occur.

また、空気入りタイヤにねじり変形が生じた場合に、ビードワイヤの巻き始め端や巻き終わり端１１３を起点としてビードコア１０１の周りでゴムのセパレーションが生じることがあった。   Further, when torsional deformation occurs in the pneumatic tire, rubber separation may occur around the bead core 101 starting from the winding start end or winding end end 113 of the bead wire.

そこで本発明は、ビードワイヤージャンピングが生じにくく、また、空気入りタイヤにねじり変形が生じてもビードコアの周りでゴムのセパレーションが生じにくい空気入りタイヤを提供することを課題とする。   Therefore, an object of the present invention is to provide a pneumatic tire in which bead wire jumping is unlikely to occur and rubber separation is unlikely to occur around the bead core even if torsional deformation occurs in the pneumatic tire.

本実施形態の空気入りタイヤは、ビードワイヤが複数回巻かれて環状になされて形成されたビードコアであって、前記ビードワイヤの巻き始め端がビードコア中心よりタイヤ径方向内側かつタイヤ幅方向内側にあり、前記ビードワイヤの巻き終わり端がビードコア中心よりタイヤ径方向外側かつタイヤ幅方向外側にあるビードコアを備えることを特徴とする。   The pneumatic tire of the present embodiment is a bead core formed by winding a bead wire a plurality of times, and the winding wire has a winding start end on the inner side in the tire radial direction and the inner side in the tire width direction from the bead core center, The winding end of the bead wire includes a bead core located on the outer side in the tire radial direction and the outer side in the tire width direction from the bead core center.

本実施形態によれば、ビードワイヤの巻き終わり端がビードコア中心よりタイヤ径方向外側かつタイヤ幅方向外側にあるためにビードワイヤージャンピングが生じにくくい。また、ビードワイヤの巻き始め端がビードコア中心よりタイヤ径方向内側かつタイヤ幅方向内側にあり、ビードワイヤの巻き終わり端がビードコア中心よりタイヤ径方向外側かつタイヤ幅方向外側にあるため、空気入りタイヤにねじり変形が生じてもビードコアの周りでゴムのセパレーションが生じにくい。   According to this embodiment, the bead wire jumping hardly occurs because the winding end of the bead wire is on the outer side in the tire radial direction and the outer side in the tire width direction from the bead core center. Also, the winding start end of the bead wire is inside the tire radial direction and inside the tire width direction from the bead core center, and the winding end end of the bead wire is outside the tire radial direction and outside the tire width direction from the bead core center. Even if the deformation occurs, rubber separation does not easily occur around the bead core.

本実施形態の空気入りタイヤのビード部１０近傍のタイヤ幅方向断面図。The tire width direction sectional view of the bead part 10 vicinity of the pneumatic tire of this embodiment. 本実施形態のビードコア１のタイヤ幅方向断面図。The tire width direction sectional view of bead core 1 of this embodiment. （ａ）比較例１の空気入りタイヤのビードコアのタイヤ幅方向断面図。（ｂ）比較例２の空気入りタイヤのビードコアのタイヤ幅方向断面図。（ｃ）比較例３の空気入りタイヤのビードコアのタイヤ幅方向断面図。（ｄ）実施例１の空気入りタイヤのビードコアのタイヤ幅方向断面図。（ｅ）実施例２の空気入りタイヤのビードコアのタイヤ幅方向断面図。(A) Tire width direction sectional drawing of the bead core of the pneumatic tire of the comparative example 1. FIG. (B) Tire width direction sectional drawing of the bead core of the pneumatic tire of the comparative example 2. FIG. (C) Tire width direction sectional drawing of the bead core of the pneumatic tire of the comparative example 3. FIG. (D) Tire width direction sectional drawing of the bead core of the pneumatic tire of Example 1. FIG. (E) Tire width direction sectional drawing of the bead core of the pneumatic tire of Example 2. FIG. 従来の一般的な空気入りタイヤのビードコア１０１近傍のタイヤ幅方向断面図。The tire width direction sectional drawing of the bead core 101 vicinity of the conventional general pneumatic tire.

本実施形態の空気入りタイヤについて図面に基づき説明する。なお本実施形態は例示であって、発明の範囲はこれに限定されない。本実施形態に対して発明の要旨を逸脱しない範囲で様々な変更を行うことができる。   The pneumatic tire of this embodiment will be described with reference to the drawings. This embodiment is an exemplification, and the scope of the invention is not limited to this. Various modifications can be made to the present embodiment without departing from the scope of the invention.

図１に示すように、実施形態の空気入りタイヤは、ビードコア１及びビードフィラー２を有するビード部１０を備える。２つのビード部１０の間ではカーカスプライ３がタイヤの骨格を形成している。カーカスプライ３はビード部１０を包むようにタイヤ幅方向内側から外側へ折り返されてタイヤ径方向外側へ巻き上げられている。カーカスプライ３のタイヤの骨格を形成している部分のタイヤ径方向外側には、ベルト層やトレッドゴムが配置されている。またカーカスプライ３のタイヤ幅方向外側にはサイドウォールゴムが配置されている。これらの他、リムストリップ、補強層その他の必要に応じた様々な部材が配置されている。   As shown in FIG. 1, the pneumatic tire of the embodiment includes a bead portion 10 having a bead core 1 and a bead filler 2. Between the two bead portions 10, the carcass ply 3 forms a tire skeleton. The carcass ply 3 is folded from the inner side in the tire width direction to the outer side so as to wrap the bead portion 10 and wound up outward in the tire radial direction. A belt layer and a tread rubber are disposed on the outer side in the tire radial direction of the portion of the carcass ply 3 that forms the tire skeleton. Further, sidewall rubber is disposed outside the carcass ply 3 in the tire width direction. In addition to these, rim strips, reinforcing layers, and other various members as required are arranged.

図１及び図２に示すように、本実施形態のビードコア１の断面形状は六角形である。ビードコア１のタイヤ径方向内側面１４及びタイヤ径方向外側面１５はタイヤ幅方向に対して所定角度θで傾斜している。この所定角度θは例えば１５°程度である。この傾斜方向（図２における矢印Ｘ方向）をビードコア１の幅方向と定義し、ビードコア１の前記幅方向の長さをビードコア１の幅と定義する。ただし、タイヤ径方向内側面１４及びタイヤ径方向外側面１５はタイヤ幅方向に対して傾斜していなくても良く、その場合は、タイヤ幅方向をビードコア１の幅方向と定義し、ビードコア１のタイヤ幅方向の長さをビードコア１の幅と定義する。   As shown in FIG.1 and FIG.2, the cross-sectional shape of the bead core 1 of this embodiment is a hexagon. The tire radial inner side surface 14 and the tire radial outer side surface 15 of the bead core 1 are inclined at a predetermined angle θ with respect to the tire width direction. This predetermined angle θ is, for example, about 15 °. This inclination direction (the arrow X direction in FIG. 2) is defined as the width direction of the bead core 1, and the length of the bead core 1 in the width direction is defined as the width of the bead core 1. However, the tire radial direction inner side surface 14 and the tire radial direction outer side surface 15 may not be inclined with respect to the tire width direction. In this case, the tire width direction is defined as the width direction of the bead core 1, and The length in the tire width direction is defined as the width of the bead core 1.

ビードコア１は、１本のビードワイヤ１１が環状に複数周巻かれることにより形成されている。ビードワイヤ１１は鋼線がゴムで被覆されたものである。図２に示すように、本実施形態のビードコア１では、ビードワイヤ１１の巻き始め端１２がビードコア中心Ｃよりタイヤ径方向内側かつタイヤ幅方向内側にあり、ビードワイヤ１１の巻き終わり端１３がビードコア中心Ｃよりタイヤ径方向外側かつタイヤ幅方向外側にある。ここで、ビードコア中心Ｃとは、ビードコア１の最大幅位置におけるビードコア１の幅方向両端部を結ぶ線の中心のことである。なおタイヤ径方向内側面１４及びタイヤ径方向外側面１５はビードコア１の最大幅位置とならない。   The bead core 1 is formed by winding a plurality of bead wires 11 in a ring shape. The bead wire 11 is a steel wire covered with rubber. As shown in FIG. 2, in the bead core 1 of this embodiment, the winding start end 12 of the bead wire 11 is on the inner side in the tire radial direction and the tire width direction from the bead core center C, and the winding end end 13 of the bead wire 11 is on the bead core center C. More outside in the tire radial direction and outside in the tire width direction. Here, the bead core center C is the center of a line connecting both end portions in the width direction of the bead core 1 at the maximum width position of the bead core 1. Note that the tire radial direction inner side surface 14 and the tire radial direction outer side surface 15 do not become the maximum width position of the bead core 1.

好ましい形態としては、図２に示すように、ビードワイヤ１１の巻き始め端１２がビードコア１のタイヤ径方向内側面１４におけるタイヤ幅方向の一番内側の位置にあり、ビードワイヤ１１の巻き終わり端１３がビードコア１のタイヤ径方向外側面１５におけるタイヤ幅方向の一番外側の位置にある。   As a preferred form, as shown in FIG. 2, the winding start end 12 of the bead wire 11 is at the innermost position in the tire width direction on the tire radial inner side surface 14 of the bead core 1, and the winding end end 13 of the bead wire 11 is The bead core 1 is at the outermost position in the tire width direction on the outer side surface 15 in the tire radial direction.

図２のビードコア１の断面図上では、ビードワイヤ１１がビードコア１の幅方向に列をなして並び、このような列がビードコア１の径方向に何層にも重ねられている。ビードワイヤ１１がこのように並んだビードコア１は例えば次のように製造される。まず、ビードコア１のタイヤ径方向内側のビードワイヤ１１の列を形成するように、ビードワイヤ１１が螺旋巻きされる。このときの巻き始めの位置はタイヤ幅方向内側の位置である。その後続けて、内径側から２列目のビードワイヤ１１の列を形成するように、先に螺旋巻きされたビードワイヤ１１の上に、ビードワイヤ１１が螺旋巻きされる。これが繰り返されて、図２に示すような、ビードワイヤ１１のタイヤ幅方向の列がタイヤ径方向に何層にも重ねられたビードコア１が完成する。ここで、巻き終わりの位置はタイヤ幅方向外側の位置である。   In the cross-sectional view of the bead core 1 in FIG. 2, the bead wires 11 are arranged in rows in the width direction of the bead core 1, and such rows are stacked in layers in the radial direction of the bead core 1. The bead core 1 in which the bead wires 11 are arranged in this way is manufactured as follows, for example. First, the bead wire 11 is spirally wound so as to form a row of bead wires 11 inside the bead core 1 in the tire radial direction. The winding start position at this time is a position on the inner side in the tire width direction. Subsequently, the bead wire 11 is spirally wound on the bead wire 11 that has been spirally wound so as to form a second row of bead wires 11 from the inner diameter side. This is repeated, and the bead core 1 in which the rows of the bead wires 11 in the tire width direction are stacked in layers in the tire radial direction as illustrated in FIG. 2 is completed. Here, the winding end position is a position on the outer side in the tire width direction.

ここで、図２に示すように、ビードワイヤ１１の巻き終わり端１３におけるビードワイヤ１１の中心からビードコア中心Ｃまでのビードコア１の幅方向の距離をｌｅ、ビードワイヤ１１の巻き始め端１２におけるビードワイヤ１１の中心からビードコア中心Ｃまでのビードコア１の幅方向の距離をｌｓ、ビードコア１の最大幅をＬとする。そして、ビードワイヤ１１の巻き始め端１２がビードコア中心Ｃよりタイヤ径方向内側かつタイヤ幅方向内側にあり、ビードワイヤ１１の巻き終わり端１３がビードコア中心Ｃよりタイヤ径方向外側かつタイヤ幅方向外側にあることを前提として、ｌｅ／Ｌ≦０．３０の関係が成立することが好ましい。また、ビードワイヤ１１の巻き始め端１２がビードコア中心Ｃよりタイヤ径方向内側かつタイヤ幅方向内側にあり、ビードワイヤ１１の巻き終わり端１３がビードコア中心Ｃよりタイヤ径方向外側かつタイヤ幅方向外側にあることを前提として、ｌｓ／Ｌ≦０．３５の関係が成立することが好ましい。   Here, as shown in FIG. 2, the distance in the width direction of the bead core 1 from the center of the bead wire 11 to the bead core center C at the winding end end 13 of the bead wire 11 is le, and the center of the bead wire 11 is at the winding start end 12 of the bead wire 11. The distance in the width direction of the bead core 1 from the bead core center C to ls, and the maximum width of the bead core 1 as L. And the winding start end 12 of the bead wire 11 is in the tire radial direction inner side and the tire width direction inner side from the bead core center C, and the winding end end 13 of the bead wire 11 is in the tire radial direction outer side and the tire width direction outer side from the bead core center C. As a premise, it is preferable that the relationship of le / L ≦ 0.30 is established. Further, the winding start end 12 of the bead wire 11 is in the tire radial direction inner side and the tire width direction inner side from the bead core center C, and the winding end end 13 of the bead wire 11 is in the tire radial direction outer side and the tire width direction outer side from the bead core center C. As a premise, it is preferable that the relationship of ls / L ≦ 0.35 is established.

なお図ではビードワイヤ１１の巻き始め端１２と巻き終わり端１３とがタイヤ幅方向の同一断面上に描かれているが、巻き始め端１２と巻き終わり端１３とがタイヤ幅方向の同一断面上に無い場合もあり得る。   In the figure, the winding start end 12 and the winding end end 13 of the bead wire 11 are drawn on the same cross section in the tire width direction, but the winding start end 12 and the winding end end 13 are on the same cross section in the tire width direction. There may be no.

本実施形態では、ビードワイヤ１１の巻き終わり端１３がビードコア中心Ｃよりタイヤ径方向外側かつタイヤ幅方向外側にあるため、カーカスプライ３のプライずれが生じてもビードワイヤ１１の巻き終わり端１３がその影響を受けにくい。そのためビードワイヤージャンピングが生じにくい。また本実施形態では、ビードワイヤ１１の巻き始め端１２がビードコア中心Ｃよりタイヤ径方向内側かつタイヤ幅方向内側にあり、かつ、ビードワイヤ１１の巻き終わり端１３がビードコア中心Ｃよりタイヤ径方向外側かつタイヤ幅方向外側にあることにより、空気入りタイヤにねじり変形が生じてもビードコア１の周りでゴムのセパレーションが生じにくくなっている。   In the present embodiment, since the winding end 13 of the bead wire 11 is on the outer side in the tire radial direction and on the outer side in the tire width direction with respect to the bead core center C, the winding end 13 of the bead wire 11 is affected even if the ply shift of the carcass ply 3 occurs. It is hard to receive. Therefore, bead wire jumping hardly occurs. Further, in the present embodiment, the winding start end 12 of the bead wire 11 is on the inner side in the tire radial direction and the inner side in the tire width direction from the bead core center C, and the winding end end 13 of the bead wire 11 is on the outer side in the tire radial direction from the bead core center C. By being on the outer side in the width direction, even if torsional deformation occurs in the pneumatic tire, rubber separation hardly occurs around the bead core 1.

特に、ビードワイヤ１１の巻き始め端１２がビードコア１のタイヤ径方向内側面１４におけるタイヤ幅方向の一番内側の位置にあり、ビードワイヤ１１の巻き終わり端１３がビードコア１のタイヤ径方向外側面１５におけるタイヤ幅方向の一番外側の位置にある場合、上記の各効果が大きくなる。   In particular, the winding start end 12 of the bead wire 11 is at the innermost position in the tire width direction on the tire radial direction inner side surface 14 of the bead core 1, and the winding end end 13 of the bead wire 11 is on the tire radial direction outer side surface 15 of the bead core 1. When it exists in the outermost position of a tire width direction, said each effect becomes large.

ここで、上記のｌｅ／Ｌ≦０．３０の関係が成立する場合、空気入りタイヤにねじり変形が生じたときのビードコア１の周りでのゴムのセパレーションが特に生じにくい。また、上記のｌｓ／Ｌ≦０．３５の関係が成立する場合、ビードワイヤ１１の巻き始め端１２がカーカスプライ３のプライずれの影響を受けにくく、ビードワイヤージャンピングが特に生じにくい。   Here, when the relationship of le / L ≦ 0.30 is established, rubber separation around the bead core 1 when torsional deformation occurs in the pneumatic tire is particularly difficult to occur. Further, when the above relationship of ls / L ≦ 0.35 is established, the winding start end 12 of the bead wire 11 is hardly affected by the ply shift of the carcass ply 3, and bead wire jumping is not particularly likely to occur.

本実施形態の効果を確認するため、表１及び図３に示す実施例及び比較例の空気入りタイヤでの、ビードワイヤージャンピングの発生率と、ビードコアの周りでのゴムのセパレーションの有無を調べた。   In order to confirm the effect of this embodiment, the occurrence rate of bead wire jumping and the presence or absence of rubber separation around the bead core in the pneumatic tires of the examples and comparative examples shown in Table 1 and FIG. 3 were examined. .

実施例及び比較例の空気入りタイヤの特徴を表１及び図３に示す。比較例１〜３の空気入りタイヤのビードコアの断面を図３（ａ）〜（ｃ）に示し、実施例１〜２の空気入りタイヤのビードコアの断面を図３（ｄ）〜（ｅ）に示す。図３において、符号１２はビードワイヤ１１の巻き始め端を、符号１３はビードワイヤ１１の巻き終わり端を、それぞれ示している。図３から明らかなように、実施例及び比較例の各空気入りタイヤでは、ビードワイヤ１１の巻き始め端１２及びビードワイヤ１１の巻き終わり端１３の位置が異なる。また、表１におけるＬ、ｌｅ、ｌｓは、図３においてＬ、ｌｅ、ｌｓで示す箇所の長さである。   The characteristics of the pneumatic tires of Examples and Comparative Examples are shown in Table 1 and FIG. The cross section of the bead core of the pneumatic tire of Comparative Examples 1 to 3 is shown in FIGS. 3A to 3C, and the cross section of the bead core of the pneumatic tire of Examples 1 to 2 is shown in FIGS. Show. In FIG. 3, reference numeral 12 denotes a winding start end of the bead wire 11, and reference numeral 13 denotes a winding end end of the bead wire 11. As apparent from FIG. 3, the positions of the winding start end 12 of the bead wire 11 and the winding end end 13 of the bead wire 11 are different in the pneumatic tires of the example and the comparative example. Further, L, le, and ls in Table 1 are the lengths of portions indicated by L, le, and ls in FIG.

ビードワイヤージャンピングの発生率は次のようにして調べた。まず１００本の空気入りタイヤを製造した。空気入りタイヤのサイズは１１Ｒ２．５とした。次に、製造した空気入りタイヤにＸ線を当ててビードワイヤージャンピングの有無を調べた。そして、ビードワイヤージャンピングが発生している空気入りタイヤの本数を数え、その本数をビードワイヤージャンピングの発生率とした。   The incidence of bead wire jumping was examined as follows. First, 100 pneumatic tires were manufactured. The size of the pneumatic tire was 11R2.5. Next, X-rays were applied to the manufactured pneumatic tire to examine the presence or absence of bead wire jumping. Then, the number of pneumatic tires in which bead wire jumping occurred was counted, and the number was used as the occurrence rate of bead wire jumping.

ビードコアの周りでのゴムのセパレーションの有無は次のようにして調べた。サイズが１１Ｒ２．５である空気入りタイヤを、ＪＡＴＭＡ標準リムにリム組みし、ＪＡＴＭＡ標準空気圧とした。そして空気入りタイヤに前記空気圧に対応した最大荷重を負荷した。空気入りタイヤをドラム試験機上で時速１５ｋｍで転動させるとともに、−５度から＋５度の角度で揺動させて空気入りタイヤに対しねじり変形させる力を加えた。これを３３６時間行った後、ビードコアの周りでのゴムのセパレーションの有無を目視で確認した。   The presence or absence of rubber separation around the bead core was examined as follows. A pneumatic tire having a size of 11R2.5 was assembled to a JATMA standard rim to form a JATMA standard air pressure. A maximum load corresponding to the air pressure was applied to the pneumatic tire. The pneumatic tire was rolled on a drum tester at a speed of 15 km / h, and a force for twisting the pneumatic tire was applied by swinging the pneumatic tire at an angle of -5 degrees to +5 degrees. After performing this for 336 hours, the presence or absence of rubber separation around the bead core was visually confirmed.

結果は表１の通りで、実施例の空気入りタイヤは、比較例の空気入りタイヤよりも、ビードワイヤージャンピングの発生が低かった。また、比較例の空気入りタイヤではビードコアの周りでのゴムのセパレーションが生じたが、実施例の空気入りタイヤではビードコアの周りでのゴムのセパレーションが生じなかった。   The results are shown in Table 1, and the pneumatic tires of the examples were less susceptible to bead wire jumping than the pneumatic tires of the comparative examples. Moreover, in the pneumatic tire of the comparative example, rubber separation occurred around the bead core, but in the pneumatic tire of the example, rubber separation around the bead core did not occur.

Figure 2018079736
Figure 2018079736

Ｃ…ビードコア中心、１…ビードコア、２…ビードフィラー、３…カーカスプライ、１０…ビード部、１１…ビードワイヤ、１２…巻き始め端、１３…巻き終わり端、１４…タイヤ径方向内側面、１５…タイヤ径方向外側面、１０１…ビードコア、１０３…カーカスプライ、１１３…巻き終わり端 C: Bead core center, 1 ... Bead core, 2 ... Bead filler, 3 ... Carcass ply, 10 ... Bead part, 11 ... Bead wire, 12 ... Winding end, 13 ... Winding end, 14 ... Tire radial inner surface, 15 ... Tire radial outer surface 101: Bead core 103: Carcass ply 113 113 End of winding

Claims (2)

ビードワイヤが複数回巻かれて環状になされて形成されたビードコアであって、前記ビードワイヤの巻き始め端がビードコア中心よりタイヤ径方向内側かつタイヤ幅方向内側にあり、前記ビードワイヤの巻き終わり端がビードコア中心よりタイヤ径方向外側かつタイヤ幅方向外側にあるビードコアを備える空気入りタイヤ。   A bead core formed by winding a bead wire a plurality of times, wherein the bead wire has a winding start end on the inner side in the tire radial direction and a tire width direction from the bead core center, and the winding end of the bead wire is at the bead core center A pneumatic tire provided with a bead core that is further on the outer side in the tire radial direction and on the outer side in the tire width direction. 前記ビードワイヤの巻き始め端がビードコアのタイヤ径方向内側面におけるタイヤ幅方向の一番内側の位置にあり、前記ビードワイヤの巻き終わり端がビードコアのタイヤ径方向外側面におけるタイヤ幅方向の一番外側の位置にある、請求項１に記載の空気入りタイヤ。   The winding start end of the bead wire is at the innermost position in the tire width direction on the inner surface in the tire radial direction of the bead core, and the winding end end of the bead wire is on the outermost side in the tire width direction on the tire radial outer surface of the bead core. The pneumatic tire of claim 1 in position.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04143108A (en) * 1990-10-04 1992-05-18 Toyo Tire & Rubber Co Ltd Radial tire for car
JP2002019428A (en) * 2000-07-06 2002-01-23 Bridgestone Corp Bead core and pneumatic tire having same
JP2004082767A (en) * 2002-08-23 2004-03-18 Toyo Tire & Rubber Co Ltd Bead core for tire
US6786262B1 (en) * 1999-08-19 2004-09-07 The Goodyear Tire & Rubber Company Tire bead with locked end wire and its method of manufacture
JP2011245967A (en) * 2010-05-26 2011-12-08 Yokohama Rubber Co Ltd:The Bead core for tire and pneumatic tire
JP2014198565A (en) * 2014-07-29 2014-10-23 横浜ゴム株式会社 Pneumatic tire

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3459797B2 (en) * 1999-09-06 2003-10-27 住友ゴム工業株式会社 Pneumatic tire
JP2006256384A (en) * 2005-03-15 2006-09-28 Sumitomo Rubber Ind Ltd Tire for heavy load
JP5049050B2 (en) * 2007-05-14 2012-10-17 住友ゴム工業株式会社 Heavy duty tire
JP2010000827A (en) * 2008-06-18 2010-01-07 Bridgestone Corp Bead core for tire, pneumatic tire, and manufacturing method of bead core for tire
JP5297488B2 (en) * 2011-03-10 2013-09-25 住友ゴム工業株式会社 Pneumatic tire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04143108A (en) * 1990-10-04 1992-05-18 Toyo Tire & Rubber Co Ltd Radial tire for car
US6786262B1 (en) * 1999-08-19 2004-09-07 The Goodyear Tire & Rubber Company Tire bead with locked end wire and its method of manufacture
JP2002019428A (en) * 2000-07-06 2002-01-23 Bridgestone Corp Bead core and pneumatic tire having same
JP2004082767A (en) * 2002-08-23 2004-03-18 Toyo Tire & Rubber Co Ltd Bead core for tire
JP2011245967A (en) * 2010-05-26 2011-12-08 Yokohama Rubber Co Ltd:The Bead core for tire and pneumatic tire
JP2014198565A (en) * 2014-07-29 2014-10-23 横浜ゴム株式会社 Pneumatic tire

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