JPH0769010A - Pneumatic tire - Google Patents

Pneumatic tire

Info

Publication number
JPH0769010A
JPH0769010A JP5238891A JP23889193A JPH0769010A JP H0769010 A JPH0769010 A JP H0769010A JP 5238891 A JP5238891 A JP 5238891A JP 23889193 A JP23889193 A JP 23889193A JP H0769010 A JPH0769010 A JP H0769010A
Authority
JP
Japan
Prior art keywords
bead
rim
tire
base
ridges
Prior art date
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.)
Pending
Application number
JP5238891A
Other languages
Japanese (ja)
Inventor
Jun Makino
純 牧野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP5238891A priority Critical patent/JPH0769010A/en
Publication of JPH0769010A publication Critical patent/JPH0769010A/en
Pending legal-status Critical Current

Links

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  • Tires In General (AREA)

Abstract

PURPOSE:To improve resistance against coming off from a rim while avoiding difficulty of rim assembling by forming many inclined ridges which fall down on the outside in the tire axial direction in relation to a normal to a rotation axis of the tire, on a surface of a bead base. CONSTITUTION:A rubber outer skin 52 which covers a carcass and folds back in the circumference of a bead core 20 is formed of a bead heel 54 which fits in a recessed section at a round corner of a rim, a bead base 56, and a bead tow 58. Many ridges consisting of inclined ridges 60 which fall down on the outside in the tire axial direction relative to an equatorial plane of the tire are arranged on a surface of the baed base 56. Consequently, it is possible to improve resistance against coming off from the rim while avoiding difficulty of rim assembling.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、リム外れを防止した
空気入りタイヤに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire which prevents the rim from coming off.

【0002】[0002]

【従来の技術】空気入りタイヤは、傾斜ビードシートと
リムフランジと両者の間に介在する隅丸凹部とを有する
リムに対して緊密嵌合するビード部を備えている。この
ビード部とは、ビードコアとこのコアの周りを折り返す
ことで端部を係止されているカーカスと、さらにこれら
を覆うゴム外皮を主たる構成としており、該ゴム外皮
は、リムの隅丸凹部に嵌合する隅丸凸形状のビードヒー
ルと、リムの傾斜ビードシートに比してタイヤ回転軸に
対する傾斜角度を部分的または全体的に大きくすること
によって締め代を与えたビードベースと、ビードベース
とサイドウォール下方部分の内壁との交差によって形成
されるビードトゥを形成しており、上記したようにリム
と嵌合するのである。
2. Description of the Related Art A pneumatic tire is provided with a bead portion which tightly fits to a rim having an inclined bead seat, a rim flange and a rounded corner recess interposed therebetween. The bead portion is mainly composed of a bead core, a carcass whose ends are locked by folding back around the core, and a rubber outer cover that further covers the carcass. Fitted bead heel with rounded corners, bead base with side or side tightened by increasing the angle of inclination with respect to the tire rotation axis compared to the inclined bead seat of the rim, and the bead base and side A bead toe is formed by intersecting the inner wall of the lower part of the wall, and fits with the rim as described above.

【0003】通常走行時には、充填された内圧とビード
ベースの締め代によってタイヤのリム外れは生じないも
のの、内圧が低下した場合には締め付けは弱くなり、リ
ム外れが生じやすくなることから、この耐リム外れ性を
向上させるために種々の提案がなされている。
During normal running, the tire does not come off the rim due to the filled internal pressure and the tightening margin of the bead base, but when the internal pressure decreases, the tightening becomes weak and the rim comes off easily. Various proposals have been made to improve the rim detachability.

【0004】上記提案のうち、ビードコアの径を小さく
したり、ビードコアの断面積を大きくしたりして、リム
への締め付け力を強める方法があるが、この場合、タイ
ヤのリム組みが困難となってしまうという問題点があっ
た。
Among the above proposals, there is a method of increasing the tightening force to the rim by decreasing the diameter of the bead core or increasing the cross-sectional area of the bead core, but in this case, it becomes difficult to assemble the tire on the rim. There was a problem that it would end up.

【0005】[0005]

【発明が解決しようとする課題】そこで、この発明にお
いては、リム組み困難を回避しながら耐リム外れ性を向
上させることを目的とする。
Therefore, it is an object of the present invention to improve the rim detachment resistance while avoiding the difficulty of assembling the rim.

【0006】[0006]

【課題を解決するための手段】この発明は、傾斜ビード
シートとリムフランジと両者の間に介在する隅丸凹部と
を有するリムに対して緊密嵌合するビード部を備えてお
り、該ビード部が、ビードコアとこのコアの周りを折り
返すことで係止されているカーカスと、さらにこれらを
覆うゴム外皮からなり、該ゴム外皮が、リムの隅丸凹部
に嵌合する隅丸凸形状のビードヒールと、リムの傾斜ビ
ードシートに比してタイヤ回転軸に対する傾斜角度を部
分的または全体的に大きくして締め代を有するビードベ
ースと、ビードベースとサイドウォール部の内壁との交
差によって形成されるビードトゥとを形成する空気入り
タイヤにおいて、上記ビードベース表面に多数のリッヂ
を有し、該リッヂがタイヤ回転軸に対する法線に対して
タイヤ軸方向外側へ倒れ込む傾斜リッヂからなることを
特徴とする空気入りタイヤである。
SUMMARY OF THE INVENTION The present invention comprises a bead portion which fits tightly to a rim having an inclined bead seat, a rim flange and a rounded corner recess interposed between the bead portion and the rim flange. Consists of a bead core, a carcass that is locked by folding back around the core, and a rubber outer covering that covers these, and the rubber outer covering is a rounded convex bead heel that fits into the rounded rounded recess of the rim. A bead base formed by intersecting a bead base and an inner wall of a sidewall portion with a bead base having a tightening margin by partially or wholly increasing an inclination angle with respect to a tire rotation axis as compared to an inclined bead seat of a rim. A pneumatic tire forming a tire having a plurality of lids on the surface of the bead base, the lids being axially outside with respect to a normal line to the tire rotation axis. A pneumatic tire, characterized in that it consists collapses inclined Riddji.

【0007】[0007]

【作用】この発明では、ビードベースにおいてタイヤ回
転軸に対する法線に対してタイヤ軸方向外側へ倒れ込む
傾斜リッヂを有しているため、タイヤ軸方向外側から内
側に向けてリム外れの外力が働いたときに、それぞれの
傾斜リッヂが抵抗し耐リム外れ性が向上する。また、リ
ム組み時においては、傾斜リッヂの傾斜方向ゆえにリッ
ヂは抵抗せず、リム組みに困難を伴わない。
In the present invention, since the bead base has the inclined ridge which falls outward in the tire axial direction with respect to the normal line to the tire rotation axis, the external force acting on the rim disengages from the outside in the axial direction of the tire. At the same time, the respective inclined ridges resist and the rim detachment resistance is improved. Further, when the rim is assembled, the ridge does not resist because of the inclination direction of the inclined ridge, and there is no difficulty in assembling the rim.

【0008】[0008]

【実施例】図1に示した構造に従う、サイズ155SR13 の
空気入りタイヤ10を試作した。このタイヤは通常の空気
入りラジアルタイヤの構造を有しており、すなわち、1
対のビードコア20と、この周りをタイヤ内側から外側に
折り返されることによって係止されるとともにトロイド
状に延びるカーカス30と、カーカス30のクラウン部に2
枚の積層配置になるベルト40を有している。
EXAMPLE A pneumatic tire 10 of size 155SR13 having the structure shown in FIG. 1 was manufactured as a prototype. This tire has the structure of a normal pneumatic radial tire, ie 1
A pair of bead cores 20, a carcass 30 that is locked by being folded back from the inside of the tire to the outside of the tire, and extends in a toroidal shape, and a carcass 30 has a crown portion 2
The belt 40 has a laminated arrangement of sheets.

【0009】図2は、図1におけるビード部50の拡大図
である。ビード部50は、ビードコア20とこのコアの周り
を折り返すことで係止されているカーカス30と、さらに
これらを覆うゴム外皮52からなり、該ゴム外皮は、リム
の隅丸凹部に嵌合する隅丸凸形状のビードヒール54と、
リムの傾斜ビードシートに比してタイヤ回転軸に対する
傾斜角度を部分的または全体的に大きくして締め代を有
するビードベース56と、ビードベース56とサイドウォー
ル部の内壁との交差によって形成されるビードトゥ58と
を形成している。
FIG. 2 is an enlarged view of the bead portion 50 in FIG. The bead portion 50 is composed of a bead core 20, a carcass 30 that is locked by folding back around the core, and a rubber outer skin 52 that covers these, and the rubber outer skin is a corner that fits into a rounded concave portion of the rim. Round convex bead heel 54,
The rim is formed by intersecting the bead base 56 and the inner wall of the sidewall part with a bead base 56 having a tightening margin by partially or entirely increasing the inclination angle with respect to the tire rotation axis as compared to the inclined bead seat. It forms a bead toe 58.

【0010】上記ビードコア20は、この試作タイヤにお
いては、1列5本のスチールワイヤのゴム引き層を4回
巻き回して形成したいわゆるストランドビードコアを用
いているが、1本のスチールワイヤを多数回巻き回した
モノワイヤビードコア等、この他のビードコアでもよ
い。また、ビードヒール54は曲率半径がおよそ6.5mm の
円弧で形成されており、この円弧がビード部外側端から
タイヤ軸方向内側6.5mmの位置まで延びて、これよりタ
イヤ軸方向内側に向けては多数のリッヂが配置されてい
る。
The bead core 20 used in this prototype tire is a so-called strand bead core formed by winding a rubberized layer of five steel wires in one row four times, but one steel wire is used many times. Other bead cores such as a wound monowire bead core may be used. Further, the bead heel 54 is formed by an arc having a radius of curvature of about 6.5 mm, and this arc extends from the outer end of the bead portion to a position 6.5 mm inward in the tire axial direction. Ridge is arranged.

【0011】該リッヂは、タイヤ赤道面に対してタイヤ
軸方向外側へ倒れ込む傾斜リッヂ60からなっており、傾
斜リッヂの中心軸mとタイヤ回転軸に対する法線nとの
なす角度αは、タイヤが嵌合するリムの傾斜ビードシー
トの傾斜角度によって好適となる範囲は異なるものの、
10°〜80°であればよく、このタイヤでは40°としてい
る。また、傾斜リッヂ60の先端間の距離Pは0.05〜3mm
であればよく、このタイヤでは0.3mm としている。さら
に、傾斜リッヂ60の振幅Nは0.01〜0.5mm であればよ
く、このタイヤでは0.1mm としている。
The ridge includes an inclined ridge 60 which is inclined outward in the tire axial direction with respect to the equatorial plane of the tire. The angle α between the central axis m of the inclined ridge and the normal line n to the tire rotation axis is Although the suitable range differs depending on the angle of inclination of the bead seat that is fitted to the rim to be fitted,
It should be 10 ° to 80 °, and 40 ° for this tire. Also, the distance P between the tips of the inclined lid 60 is 0.05 to 3 mm.
If it is, it is 0.3mm for this tire. Further, the amplitude N of the inclined lid 60 may be 0.01 to 0.5 mm, and is 0.1 mm for this tire.

【0012】この傾斜リッヂ60の振幅の中心を結んでで
きるラインは、後述する従来タイヤのビードベース表面
のラインと同じであり、タイヤ回転軸に対してほぼ15°
に傾斜した直線となっている。
The line formed by connecting the centers of the amplitudes of the inclined ridges 60 is the same as the line on the bead base surface of a conventional tire, which will be described later, and is approximately 15 ° with respect to the tire rotation axis.
It is a straight line inclined to.

【0013】比較として、図3に示すビード部50の構造
に従う同サイズのタイヤについても試作した。この従来
タイヤと上記発明タイヤと異なるのは、ビードベース表
面における傾斜リッヂの有無である。
As a comparison, a tire of the same size having the structure of the bead portion 50 shown in FIG. The difference between this conventional tire and the above-mentioned invention tire is the presence or absence of an inclined ridge on the bead base surface.

【0014】かくして得られた供試タイヤをリム13×4.
5Jに組み付けて、下記の耐リム外れ性試験を行った。
The test tire thus obtained was rim 13 × 4.
After being assembled to 5J, the following rim detachment resistance test was conducted.

【0015】(耐リム外れ性試験1)この試験は、上記
タイヤ組立体に荷重500kgfをタイヤ側方からかけた状態
で内圧を下げていき、リム外れが生じたときの内圧を計
測したものである。
(Rim Release Test 1) This test measures the internal pressure when the rim comes off by lowering the internal pressure with a load of 500 kgf applied to the tire assembly from the side of the tire. is there.

【0016】(耐リム外れ性試験2)この試験は、上記
タイヤ組立体に内圧1.8kgf/cm2を充填した状態で、タイ
ヤ側方から荷重を上げながらかけていき、リム外れを生
じたときの荷重を計測したものである。
(Rim detachment resistance test 2) This test is conducted when the tire assembly is filled with an internal pressure of 1.8 kgf / cm 2 and the load is applied from the side of the tire to cause rim detachment. The load is measured.

【0017】いずれの試験も、指数評価にして従来タイ
ヤ100 に対して発明タイヤ105 であり(大きい方が良好
であることを示す)、発明タイヤが耐リム外れ性に優れ
ていることが明らかとなった。
In each of the tests, the invention tire 105 was index-evaluated with respect to the conventional tire 100 (the larger the better, the better), and it is clear that the invention tire has excellent rim detachment resistance. became.

【0018】また、供試タイヤを、自動リム組み機によ
る組み付けの際のリム組みトルク、リム組み後内圧充填
してビード部がリムの傾斜ビードシートに鎮座するに要
する内圧、およびビードベースをリム径にまで拡張した
ときに発生する力をそれぞれ計測したところ、従来タイ
ヤ、発明タイヤでほぼ同等であり、発明タイヤが従来タ
イヤ対比リム組みに困難を伴っていないことが明らかと
なった。
[0018] Further, the rim assembly torque when the test tire is assembled by an automatic rim assembly machine, the internal pressure required for the bead portion to be seated on the inclined bead seat of the rim by filling the internal pressure after the rim assembly, and the bead base. When the force generated when the tire was expanded to the diameter was measured, it was found that the conventional tire and the invention tire are almost the same, and it is clear that the invention tire has no difficulty in assembling the rim in comparison with the conventional tire.

【0019】[0019]

【発明の効果】この発明によれば、リム組み困難を回避
しながら耐リム外れ性を向上させることができる。
According to the present invention, it is possible to improve the rim detachment resistance while avoiding the difficulty of assembling the rim.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明に従うタイヤの幅方向断面図である。
この断面図はタイヤ赤道面に対して片面しか図示してい
ないが、図示されていない片面も同様の構造をなしてい
る。
FIG. 1 is a widthwise sectional view of a tire according to the present invention.
Although this cross-sectional view shows only one surface with respect to the equatorial plane of the tire, one surface not shown has a similar structure.

【図2】図1におけるビード部50の拡大図である。FIG. 2 is an enlarged view of a bead portion 50 in FIG.

【図3】従来タイヤにおけるビード部50の拡大断面図で
ある。
FIG. 3 is an enlarged sectional view of a bead portion 50 in a conventional tire.

【符号の簡単な説明】[Simple explanation of symbols]

10 空気入りタイヤ 20 ビードコア 50 ビード部 56 ビードベース 60 傾斜リッヂ 10 Pneumatic tire 20 Bead core 50 Bead section 56 Bead base 60 Inclined ridge

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】傾斜ビードシートとリムフランジと両者の
間に介在する隅丸凹部とを有するリムに対して緊密嵌合
するビード部を備えており、該ビード部が、ビードコア
とこのコアの周りを折り返すことで係止されているカー
カスと、さらにこれらを覆うゴム外皮からなり、該ゴム
外皮が、リムの隅丸凹部に嵌合する隅丸凸形状のビード
ヒールと、リムの傾斜ビードシートに比してタイヤ回転
軸に対する傾斜角度を部分的または全体的に大きくして
締め代を有するビードベースと、ビードベースとサイド
ウォール部の内壁との交差によって形成されるビードト
ゥとを形成する空気入りタイヤにおいて、 上記ビードベース表面に多数のリッヂを有し、該リッヂ
がタイヤ回転軸に対する法線に対してタイヤ軸方向外側
へ倒れ込む傾斜リッヂからなることを特徴とする空気入
りタイヤ。
1. A bead portion for closely fitting to a rim having an inclined bead seat, a rim flange, and a rounded corner recess interposed therebetween, the bead portion including a bead core and a periphery of the core. A carcass that is locked by folding back, and a rubber outer covering that covers them, and the rubber outer covering is different from a bead heel with a rounded corner convex shape that fits into a rounded corner recessed portion of the rim, and an inclined bead seat of the rim. In a pneumatic tire forming a bead base having a tightening margin by partially or wholly increasing the inclination angle with respect to the tire rotation axis, and a bead toe formed by the intersection of the bead base and the inner wall of the sidewall portion. , The bead base has a large number of ridges, and the ridges are inclined ridges that fall outward in the tire axial direction with respect to the normal to the tire rotation axis A pneumatic tire characterized by the following.
JP5238891A 1993-08-31 1993-08-31 Pneumatic tire Pending JPH0769010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5238891A JPH0769010A (en) 1993-08-31 1993-08-31 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5238891A JPH0769010A (en) 1993-08-31 1993-08-31 Pneumatic tire

Publications (1)

Publication Number Publication Date
JPH0769010A true JPH0769010A (en) 1995-03-14

Family

ID=17036807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5238891A Pending JPH0769010A (en) 1993-08-31 1993-08-31 Pneumatic tire

Country Status (1)

Country Link
JP (1) JPH0769010A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0774368A1 (en) * 1995-11-14 1997-05-21 Sumitomo Rubber Industries Ltd. Pneumatic tyre
EP1149713A2 (en) * 2000-04-28 2001-10-31 The Goodyear Tire & Rubber Company A bead profile for pneumatic tires
KR100839734B1 (en) * 2007-03-30 2008-06-19 금호타이어 주식회사 Tire being provided with projection on surface of bead part
US8286680B2 (en) * 2009-04-28 2012-10-16 Bridgestone Americas Tire Operations, Llc Tire with circumferential grooves in the bead region
US8627866B2 (en) * 2009-01-09 2014-01-14 Bridgestone Americas Tire Operations, Llc Tire and wheel rim assembly
CN106114074A (en) * 2016-08-27 2016-11-16 厦门正新橡胶工业有限公司 Tire bead structure
JP2021074912A (en) * 2019-11-06 2021-05-20 Toyo Tire株式会社 Bead ring and tire vulcanizing mold

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0774368A1 (en) * 1995-11-14 1997-05-21 Sumitomo Rubber Industries Ltd. Pneumatic tyre
US5769981A (en) * 1995-11-14 1998-06-23 Sumitomo Rubber Industries, Ltd. Pneumatic tire with bead regions having circumferentially extending ribs
EP1149713A2 (en) * 2000-04-28 2001-10-31 The Goodyear Tire & Rubber Company A bead profile for pneumatic tires
EP1149713A3 (en) * 2000-04-28 2003-04-16 The Goodyear Tire & Rubber Company A bead profile for pneumatic tires
KR100839734B1 (en) * 2007-03-30 2008-06-19 금호타이어 주식회사 Tire being provided with projection on surface of bead part
US8627866B2 (en) * 2009-01-09 2014-01-14 Bridgestone Americas Tire Operations, Llc Tire and wheel rim assembly
US8286680B2 (en) * 2009-04-28 2012-10-16 Bridgestone Americas Tire Operations, Llc Tire with circumferential grooves in the bead region
CN106114074A (en) * 2016-08-27 2016-11-16 厦门正新橡胶工业有限公司 Tire bead structure
JP2021074912A (en) * 2019-11-06 2021-05-20 Toyo Tire株式会社 Bead ring and tire vulcanizing mold

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