JP2004230941A - Structure of tire bead section, and pneumatic tire having tire bead section - Google Patents

Structure of tire bead section, and pneumatic tire having tire bead section Download PDF

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Publication number
JP2004230941A
JP2004230941A JP2003018966A JP2003018966A JP2004230941A JP 2004230941 A JP2004230941 A JP 2004230941A JP 2003018966 A JP2003018966 A JP 2003018966A JP 2003018966 A JP2003018966 A JP 2003018966A JP 2004230941 A JP2004230941 A JP 2004230941A
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Prior art keywords
tire
bead
tire bead
core
section
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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JP2003018966A
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Japanese (ja)
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JP4246509B2 (en
Inventor
Tsukasa Nakagawa
司 中川
Tatsuzo Nakano
辰三 中野
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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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
    • B60C2015/048—Polygonal cores characterised by the winding sequence

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  • Tires In General (AREA)
  • Tyre Moulding (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a tire bead section capable of improving productivity of a bead core, preventing jumping of a tow section inside the tire bead section, and improving stability and durability of the tire bead section, and a pneumatic tire having the tire bead section. <P>SOLUTION: In the bead core 6 buried in the tire bead section 5, a core body 6a located in a heel section 8a outside the tire bead section and a projection 6b located in the toe section 8b inside the tire bead section are integrally formed of one bead wire as shown in the Fig. The tire bead section is manufactured in one process by winding, like ring by one rubberized bead wire, the large angular core body 6a located in the heel section 8a and the small angular projection 6b located in the toe section 8b connecting to it. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、タイヤビード部の構造及びそのタイヤビード部を備えた空気入りタイヤにかかわり、更に詳しくは重荷重空気入りラジアルタイヤのタイヤビード部内側のトウ部に位置するタイヤビード部の跳ね上がりを防止すると共に、タイヤビード部の生産性の向上とビード部の安定性及び耐久性を向上させたタイヤビード部の構造及びそのタイヤビード部を備えた空気入りタイヤに関するものである。
【０００２】
【従来の技術】
従来、重荷重空気入りラジアルタイヤのタイヤビード部の構造としては、例えば、図４に示すように、カーカスプライ１１を、トレッド部からサイドウォール部を経てビード部１２まで延在させ、その各端末部域をビード部１２に埋設した六角ビード１３の廻りでタイヤの内側から外側へ巻き返して埋設し、固定する方法が一般的である。
【０００３】
ところで、タイヤビード部における耐久性を改善してリムずれや、へたり、或いはカーカスプライ巻き返し部分でのセパレーションの発生等を回避させるために、近年ではビードコアとサブビードコアとを二分割し、タイヤビード部外側のヒール部とタイヤビード部内側のトウ部に配設したものが知られている（例えば、特許文献１参照）。
【０００４】
【特許文献１】
特開２０００−３０１９１７号公報（第２頁〜第４頁、図１）。
【０００５】
【発明が解決しようとする課題】
然しながら、このような従来のタイヤビード部の構造は、タイヤビード部外側のヒール部のビードコアと、タイヤビード部内側のトウ部のサブビードコアとをそれぞれ別途に埋設させて剛性を持たせる構造になっているため、組立工数も多く、生産性の向上を図ることが出来ないばかりか、安価に製作できないと言う問題があった。
【０００６】
この発明はかかる従来の問題点に着目し、ビードコアの生産性を向上させることが出来ると共に、タイヤビード部内側のトウ部の跳ね上がり防止させ、タイヤビード部の安定性及び耐久性を向上させることが出来るタイヤビード部の構造及びそのタイヤビード部を備えた空気入りタイヤを提供することを目的とするものである。
【０００７】
【課題を解決するための手段】
この発明は上記目的を達成するため、この発明のタイヤビード部の構造は、一本のビードワイヤーを連続的に巻付けてリング状のビードコアに形成したタイヤビード部の構造であって、前記ビードコアを、タイヤビード部外側のヒール部に位置するコア本体と、タイヤビード部内側のトウ部に位置する突起部とを一体的に形成したことを要旨とするものである。
【０００８】
ここで、前記ビードコアの断面形状は、タイヤビード部内側のトウ部に向かって末広がりとなるように形成するものである。
【０００９】
このように、一本のビードワイヤーを連続的に巻付けてリング状のビードコアに形成するので、ビードコアの生産性を向上させることが出来ると共に、タイヤビード部内側のトウ部の跳ね上がり防止させることが出来るものである。
【００１０】
また、この発明の上記タイヤビード部を備えた空気入りタイヤは、タイヤビード部に、タイヤビード部外側のヒール部に位置するコア本体と、タイヤビード部内側のトウ部に位置する突起部とを一本のビードワイヤーにより一体的に形成したビードコアを埋設したことを要旨とするものである。
【００１１】
このような構造の空気入りタイヤとするので、タイヤビード部の安定性及び耐久性を向上させることが出来るものである。
【００１２】
【発明の実施の形態】
以下、添付図面に基づき、この発明の実施形態を説明する。
【００１３】
図１は、この発明を実施した重荷重用の空気入りラジアルタイヤの半断面図を示し、この空気入りラジアルタイヤ１は、少なくとも一枚以上のカーカスプライ２を、トレッド部３からサイドウォール部４を経てタイヤビード部５に埋設したビードコア６の廻りで巻き返した構成となっている。なお、７はタイヤビード部５に装着したタイヤリムを示している。
【００１４】
前記タイヤビード部５に埋設したビードコア６は、図２に示すように、タイヤビード部外側のヒール部８ａに位置するコア本体６ａと、タイヤビード部内側のトウ部８ｂに位置する突起部６ｂとを一本のビードワイヤーにより一体的に形成してある。
【００１５】
即ち、この実施形態では、ヒール部８ａに位置する大きい山形状のコア本体６ａと、これに連続してトウ部８ｂに位置する小さい山形状の突起部６ｂとを一本のゴム引きしたビードワイヤーによりリング状に巻付けながら１回の工程で製造するものである。
【００１６】
ビードワイヤーの巻付け工程としては、図２の巻付け線図Ｘに示すように、ビードコア６の裾部となる一端Ｓａ側から巻付けを開始し、順次積層させて大小２山のコア本体６ａと突起部６ｂとを連続的、かつ一体的に製造するので、ビードワイヤーの端末部Ｓａ，Ｓｂは２箇所しか存在しないビードコア６とすることが出来るものである。
【００１７】
なお、ビードコア６の断面形状としては、上記の実施形態に限定されず、例えば、図３に示すようなタイヤビード部内側のトウ部８ｂに向かって末広がりとなるように略三角形状や、また図示しないが略台形状等、種々の形態が考えられるものである。
【００１８】
このように、一本のビードワイヤーを連続的に巻付けて大小２山の形態を有するリング状のビードコア６に形成するので、ビードコア６の生産性を向上させることが出来ると共に、タイヤビード部内側のトウ部８ｂの跳ね上がり防止させることが出来るものである。
【００１９】
また、この発明のタイヤビード部５を備えた空気入りタイヤは、タイヤビード部５に、タイヤビード部外側のヒール部８ａに位置するコア本体６ａと、タイヤビード部内側のトウ部８ｂに位置する突起部６ｂとを一本のビードワイヤーにより一体的に形成したビードコア６を埋設してあるので、タイヤビード部５の安定性及び耐久性を向上させることが出来、重荷重用の空気入りラジアルタイヤの耐久性も向上させることが出来るものである。
【００２０】
【発明の効果】
この発明は、上記のように一本のビードワイヤーを連続的に巻付けてリング状のビードコアに形成したタイヤビード部の構造であって、前記ビードコアを、タイヤビード部外側のヒール部に位置するコア本体と、タイヤビード部内側のトウ部に位置する突起部とを一体的に形成したので、ビードコアの生産性を向上させることが出来ると共に、タイヤビード部内側のトウ部の跳ね上がり防止させることが出来る効果がある。
【００２１】
また、この発明のタイヤビード部を備えた空気入りタイヤは、タイヤビード部に、タイヤビード部外側のヒール部に位置するコア本体と、タイヤビード部内側のトウ部に位置する突起部とを一本のビードワイヤーにより一体的に形成したビードコアを埋設したので、タイヤビード部の安定性及び耐久性を向上させることが出来ると共に、重荷重用の空気入りラジアルタイヤの耐久性も向上させることが出来る効果がある。
【図面の簡単な説明】
【図１】この発明を実施した重荷重用の空気入りラジアルタイヤの半断面図である。
【図２】図１のＡ部の拡大説明図である。
【図３】他の実施形態を示す図２と同様な図である。
【図４】従来の重荷重用空気入りタイヤのビード部の断面図である。
【符号の説明】
１ 空気入りラジアルタイヤ ２ カーカスプライ
３ トレッド部 ４ サイドウォール部
５ タイヤビード部 ６ ビードコア
６ａ コア本体 ６ｂ 突起部
７ タイヤリム ８ａ ヒール部
８ｂ トウ部 Ｘ 巻付け線図
Ｓａ，Ｓｂ ビードワイヤーの端末部
１１ カーカスプライ １２ ビード部
１３ 六角ビード[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure of a tire bead portion and a pneumatic tire having the tire bead portion, and more specifically, to prevent a tire bead portion located on a toe portion inside a tire bead portion of a heavy-duty pneumatic radial tire from jumping up. In addition, the present invention relates to a structure of a tire bead portion in which productivity of a tire bead portion is improved and stability and durability of the bead portion are improved, and a pneumatic tire having the tire bead portion.
[0002]
[Prior art]
Conventionally, as a structure of a tire bead portion of a heavy-duty pneumatic radial tire, for example, as shown in FIG. 4, a carcass ply 11 is extended from a tread portion to a bead portion 12 via a sidewall portion, In general, a method is employed in which a region is wound around the hexagonal bead 13 embedded in the bead portion 12 from the inside to the outside of the tire, embedded and fixed.
[0003]
By the way, recently, in order to improve the durability at the tire bead portion and to avoid the occurrence of rim misalignment, settling, or separation at the carcass ply rewinding portion, the bead core and the sub-bead core have been divided into two in recent years. There has been known an arrangement in which a heel portion on the outer side and a toe portion on the inner side of the tire bead portion are provided (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2000-301917 (pages 2 to 4, FIG. 1).
[0005]
[Problems to be solved by the invention]
However, such a conventional tire bead structure has a structure in which a bead core on the heel portion outside the tire bead portion and a sub-bead core on the toe portion inside the tire bead portion are separately embedded to have rigidity. Therefore, there are many man-hours for assembling, so that not only cannot productivity be improved, but also it cannot be manufactured at low cost.
[0006]
The present invention focuses on such conventional problems, and can improve the productivity of the bead core, prevent the toe portion inside the tire bead portion from jumping up, and improve the stability and durability of the tire bead portion. It is an object of the present invention to provide a structure of a tire bead portion and a pneumatic tire having the tire bead portion.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a tire bead portion having a structure in which a single bead wire is continuously wound to form a ring-shaped bead core. The gist is that a core body located on the heel portion outside the tire bead portion and a protrusion located on the toe portion inside the tire bead portion are integrally formed.
[0008]
Here, the cross-sectional shape of the bead core is formed so as to widen toward the toe portion inside the tire bead portion.
[0009]
As described above, since one bead wire is continuously wound to form a ring-shaped bead core, the productivity of the bead core can be improved, and the toe portion inside the tire bead portion can be prevented from jumping up. You can do it.
[0010]
Further, the pneumatic tire provided with the tire bead portion of the present invention includes, in the tire bead portion, a core body located on the heel portion outside the tire bead portion, and a protrusion located on the toe portion inside the tire bead portion. The gist is to embed a bead core integrally formed by one bead wire.
[0011]
Since the pneumatic tire having such a structure is used, the stability and durability of the tire bead portion can be improved.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
FIG. 1 shows a half-sectional view of a pneumatic radial tire for heavy loads embodying the present invention. In this pneumatic radial tire 1, at least one or more carcass plies 2 are connected to a tread portion 3 to a sidewall portion 4. It is configured to be wrapped around a bead core 6 embedded in the tire bead portion 5 after passing through. Reference numeral 7 denotes a tire rim mounted on the tire bead portion 5.
[0014]
As shown in FIG. 2, the bead core 6 embedded in the tire bead portion 5 includes a core body 6a located on the heel portion 8a outside the tire bead portion, and a protrusion 6b located on the toe portion 8b inside the tire bead portion. Are integrally formed by one bead wire.
[0015]
That is, in this embodiment, a bead wire obtained by rubberizing a large mountain-shaped core body 6a located on the heel portion 8a and a small mountain-shaped projection portion 6b located on the toe portion 8b in succession to this. And is manufactured in a single process while being wound in a ring shape.
[0016]
In the bead wire winding process, as shown in a winding diagram X in FIG. 2, winding is started from one end Sa side which is a skirt portion of the bead core 6, and the core body 6a having two large and small cores is sequentially laminated. And the protrusion 6b are manufactured continuously and integrally, so that the bead core 6 having only two terminal portions Sa and Sb of the bead wire can be provided.
[0017]
The cross-sectional shape of the bead core 6 is not limited to the above-described embodiment, and may be, for example, a substantially triangular shape so as to expand toward the toe portion 8b inside the tire bead portion as shown in FIG. However, various forms such as a substantially trapezoidal shape are conceivable.
[0018]
As described above, since one bead wire is continuously wound to form the ring-shaped bead core 6 having a shape of two peaks, the productivity of the bead core 6 can be improved, and the tire bead portion inner side can be improved. Of the toe portion 8b.
[0019]
Further, the pneumatic tire provided with the tire bead portion 5 of the present invention is located on the tire bead portion 5, the core body 6a located on the heel portion 8a outside the tire bead portion, and the toe portion 8b located on the inside of the tire bead portion. Since the bead core 6 formed integrally with the protrusion 6b by one bead wire is embedded, the stability and durability of the tire bead 5 can be improved, and the pneumatic radial tire for heavy loads can be used. The durability can also be improved.
[0020]
【The invention's effect】
The present invention is a structure of a tire bead portion formed as a ring-shaped bead core by continuously winding one bead wire as described above, wherein the bead core is located at a heel portion outside the tire bead portion. Since the core body and the projection located at the toe portion inside the tire bead portion are integrally formed, the productivity of the bead core can be improved, and the toe portion inside the tire bead portion can be prevented from jumping up. There is an effect that can be done.
[0021]
In the pneumatic tire provided with the tire bead portion of the present invention, the tire bead portion includes a core body located on the heel portion outside the tire bead portion and a projection located on the toe portion inside the tire bead portion. Since the bead core formed integrally with the bead wire is embedded, the stability and durability of the tire bead can be improved, and the durability of the pneumatic radial tire for heavy loads can be improved. There is.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a pneumatic radial tire for heavy loads embodying the present invention.
FIG. 2 is an enlarged explanatory view of a portion A in FIG. 1;
FIG. 3 is a view similar to FIG. 2 showing another embodiment.
FIG. 4 is a sectional view of a bead portion of a conventional heavy duty pneumatic tire.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pneumatic radial tire 2 Carcass ply 3 Tread part 4 Side wall part 5 Tire bead part 6 Bead core 6a Core body 6b Projection part 7 Tire rim 8a Heel part 8b Toe part X Winding diagram Sa, Sb Bead wire terminal part 11 Carcass Ply 12 Bead section 13 Hexagon bead

Claims (3)

一本のビードワイヤーを連続的に巻付けてリング状のビードコアに形成したタイヤビード部の構造であって、
前記ビードコアを、タイヤビード部外側のヒール部に位置するコア本体と、タイヤビード部内側のトウ部に位置する突起部とを一体的に形成したことを特徴とするビードコアの構造。A structure of a tire bead portion formed by continuously winding one bead wire to form a ring-shaped bead core,
The bead core structure, wherein the bead core is formed integrally with a core body located at a heel portion outside a tire bead portion and a projection portion located at a toe portion inside a tire bead portion. 前記ビードコアの断面形状を、タイヤビード部内側のトウ部に向かって末広がりとなるように形成した請求項１に記載のタイヤビード部の構造。The structure of a tire bead portion according to claim 1, wherein the cross-sectional shape of the bead core is formed so as to expand toward the toe portion inside the tire bead portion. 少なくとも一枚以上のカーカスプライを、トレッド部からサイドウォール部を経てタイヤビード部に埋設したビードコアの廻りで巻き返して成るタイヤビード部を備えた空気入りタイヤにおいて、
前記タイヤビード部に、タイヤビード部外側のヒール部に位置するコア本体と、タイヤビード部内側のトウ部に位置する突起部とを一本のビードワイヤーにより一体的に形成したビードコアを埋設したことを特徴とするタイヤビード部を備えた空気入りタイヤ。At least one or more carcass plies, in a pneumatic tire having a tire bead portion wound around a bead core embedded in a tire bead portion from a tread portion through a sidewall portion,
In the tire bead portion, a bead core in which a core body located on the heel portion outside the tire bead portion and a protrusion located on the toe portion inside the tire bead portion are integrally formed by one bead wire is embedded. A pneumatic tire provided with a tire bead portion.
JP2003018966A 2003-01-28 2003-01-28 Structure of tire bead part, manufacturing method of tire bead part, and pneumatic tire provided with tire bead part Expired - Fee Related JP4246509B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009190470A (en) * 2008-02-12 2009-08-27 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2015157599A (en) * 2014-02-25 2015-09-03 住友ゴム工業株式会社 pneumatic tire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009190470A (en) * 2008-02-12 2009-08-27 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2015157599A (en) * 2014-02-25 2015-09-03 住友ゴム工業株式会社 pneumatic tire

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