JPH07205620A - Radial tire for car - Google Patents

Radial tire for car

Info

Publication number
JPH07205620A
JPH07205620A JP6007168A JP716894A JPH07205620A JP H07205620 A JPH07205620 A JP H07205620A JP 6007168 A JP6007168 A JP 6007168A JP 716894 A JP716894 A JP 716894A JP H07205620 A JPH07205620 A JP H07205620A
Authority
JP
Japan
Prior art keywords
rubber thickness
bead
radial
carcass
tire
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
JP6007168A
Other languages
Japanese (ja)
Inventor
Yukinori Nagata
幸則 永田
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.)
Ohtsu Tire and Rubber Co Ltd
Original Assignee
Ohtsu Tire and Rubber Co Ltd
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 Ohtsu Tire and Rubber Co Ltd filed Critical Ohtsu Tire and Rubber Co Ltd
Priority to JP6007168A priority Critical patent/JPH07205620A/en
Publication of JPH07205620A publication Critical patent/JPH07205620A/en
Pending legal-status Critical Current

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  • Tires In General (AREA)

Abstract

PURPOSE:To provide a radial tire for a car which is easy in the assembling of rims and excellent in disassembling thereof. CONSTITUTION:A radial tire T for a car is provided with a radial carcass 2 for connecting one of beadcores 1 to the other bead-core 1 and both ends of the carcass 2 are folded up on the bead-core 1 and the folded-up end 4 is positioned at the side wall 5 having the maximum tire width and tread plies 6 are arranged at the outer periphery corresponding to the tread of radial carcass 2. When the length of radial carcass 2 from one bead to another bead is BPP and the width of tread ply 6 is A, A/BPP is set at 0.40-0.45 and the first rubber thickness E of the side wall 5 at the folded-up end 4 is set at 2.5-3.5mm. And further, the second rubber thickness I at the edge of tread ply 6 is set at 9.0-10.0mm and the second rubber thickness I is thicker by 6.0-8.0mm against the first rubber thickness E.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、乗用車用ラジアルタイ
ヤに係り、リム組が容易でありながらリム外れ性を向上
したものに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radial tire for a passenger car, which has an improved rim dismounting property while facilitating rim assembly.

【0002】[0002]

【従来の技術】乗用車用ラジアルタイヤTとして、図1
に示す如く、一方のビードコア1と他方のビードコア1
とを連結するラジアルカーカス2を備え、該カーカス2
の両端をビードコア1に巻上げてその巻上げ端4をタイ
ヤ最大幅のサイドウオール部5に位置させ、前記ラジア
ルカーカス2のトレッド対応部分の外周にトレッドプラ
イ6を配置しているものがあり、左右一対のビード部7
をリム8のビード着座部9に嵌合するとともに、ハンプ
10によってリムずれを防止している。
2. Description of the Related Art As a radial tire T for passenger cars, FIG.
As shown in, one bead core 1 and the other bead core 1
The carcass 2 is provided with a radial carcass 2 connecting the
Both ends of the radial carcass 2 are wound on the bead core 1 and the winding ends 4 are positioned on the side wall portion 5 having the maximum tire width, and the tread ply 6 is arranged around the tread corresponding portion of the radial carcass 2. Bead part 7
Is fitted to the bead seat portion 9 of the rim 8, and the hump 10 prevents the rim from being displaced.

【0003】[0003]

【発明が解決しようとする課題】タイヤ、特に、チュー
ブレス空気入りタイヤTにおいて重要なことはリム8か
らタイヤTが外れるのを防止することであり、このた
め、ビードコア1の内径を小さくすると、リム組が困難
となる。また、リム8のビード着座部9に対してビード
部7の接触する部分のゴム摩擦係数を大きくしてリム外
れを防止する対策を講じたとしてもリム組が困難であ
る。一方、特に、重心高、重量大なる特殊車両において
は上述の対策を講じたからといってリム外れ防止効果は
あまり期待できないのである。
In a tire, especially in a tubeless pneumatic tire T, what is important is to prevent the tire T from coming off the rim 8. Therefore, if the inner diameter of the bead core 1 is reduced, Pairing becomes difficult. Further, even if measures are taken to prevent the rim from coming off by increasing the rubber friction coefficient of the portion where the bead portion 7 contacts the bead seat portion 9 of the rim 8, it is difficult to assemble the rim. On the other hand, especially in a special vehicle having a high center of gravity and a large weight, the effect of preventing rim detachment cannot be expected so much even if the above-mentioned measures are taken.

【0004】そこで本発明者は、リム外れのメカニズム
を鋭意研究した処、タイヤTのサイドウオール部5特
に、バットレス部5Aの変形が大きくなると、カーカス
2がビードコア1を引上げる力が作用し、この結果、リ
ム外れが生じていることを知見し、このため、バットレ
ス部5Aの変形を抑えることによってリム組性能を損う
ことなくリム外れ性能を向上できる乗用車用ラジアルタ
イヤの提供に成巧したのである。
The inventor of the present invention has conducted extensive studies on the mechanism of rim disengagement, and when the deformation of the side wall portion 5 of the tire T, particularly the buttress portion 5A, becomes large, the carcass 2 exerts a force to pull up the bead core 1, As a result, it was found that the rim disengagement had occurred. Therefore, the present invention was successful in providing a radial tire for a passenger vehicle capable of improving the rim disengagement performance without impairing the rim assembly performance by suppressing the deformation of the buttress portion 5A. Of.

【0005】[0005]

【課題を解決するための手段】本発明は、一方のビード
コア1と他方のビードコア1とを連結するラジアルカー
カス2を備え、該カーカス2の両端をビードコア1に巻
上げてその巻上げ端4をタイヤ最大幅のサイドウオール
部5に位置させ、前記ラジアルカーカス2のトレッド対
応部分の外周にトレッドプライ6を配置している乗用車
用ラジアルタイヤTにおいて、前述の目的を達成するた
めに、次の技術的手段を講じている。
The present invention is provided with a radial carcass 2 for connecting one bead core 1 and the other bead core 1, and both ends of the carcass 2 are wound on the bead core 1 and the hoisting end 4 is wound on the tire core. In a radial tire T for a passenger vehicle in which a tread ply 6 is arranged on the outer wall of a portion corresponding to the tread of the radial carcass 2 in a large side wall portion 5, in order to achieve the above object, the following technical means are provided. Are taking.

【0006】すなわち、本発明は、トレッドプライ6の
エッジが位置するバットレス部5Aの第2ゴム厚みIを
前記サイドウオール部5に位置する巻上げ端4の第1ゴ
ム厚みEに対して増厚していることを特徴とするもので
ある。更に、本発明は、前記ラジアルカーカス2のビー
ドからビードまでの長さをBPPとし、かつ、前記トレ
ッドプライ6の幅をAとしたとき、A/BPPの値を
0.40〜0.45に設定し、前記巻上げ端4における
サイドウオール部5の第1ゴム厚みEを2.5〜3.5
mmに設定しており、更に、前記トレッドプライ6のエ
ッジにおける第2ゴム厚みIを9.0〜10.0mmに
設定しているとともに、前記第2ゴム厚みIが第1ゴム
厚みEに対して6.0mm〜8.0mmの増厚とされて
いることを特徴とするものである。
That is, according to the present invention, the second rubber thickness I of the buttress portion 5A on which the edge of the tread ply 6 is located is increased with respect to the first rubber thickness E of the winding end 4 located on the side wall portion 5. It is characterized by that. Further, in the present invention, when the length from the bead to the bead of the radial carcass 2 is BPP and the width of the tread ply 6 is A, the value of A / BPP is 0.40 to 0.45. The first rubber thickness E of the side wall portion 5 at the winding end 4 is set to 2.5 to 3.5.
mm, the second rubber thickness I at the edge of the tread ply 6 is set to 9.0 to 10.0 mm, and the second rubber thickness I is relative to the first rubber thickness E. It is characterized in that the thickness is increased to 6.0 mm to 8.0 mm.

【0007】[0007]

【作用】本発明に係るタイヤTを乗用車に装着して走行
するとき、バットレス部5Aにおける変形が抑制されて
ビードコア1をカーカス2が引上げる力は小さく、リム
外れを防止する。
When the tire T according to the present invention is mounted on a passenger vehicle and travels, the deformation of the buttress portion 5A is suppressed and the carcass 2 pulls up the bead core 1 with a small force to prevent the rim from coming off.

【0008】[0008]

【実施例】以下、図1を参照して本発明の実施例を説明
するが、既述した構成と共通する部分は共通符号を付し
ている。図ではタイヤ赤道線0−0の右半分を示してい
るが左半分もほぼ同じ構成である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1, and the portions common to the above-mentioned constitutions will be designated by common reference numerals. The figure shows the right half of the tire equator line 0-0, but the left half has almost the same configuration.

【0009】図ではトレッドプライ6は、幅Aとされて
いる第1トレッドプライ6Aとこれより幅狭とされてい
る第2トレッドプライ6Bよりなっていて、このプライ
6のエッジにおける第2ゴム厚さIを有してバットレス
部5Aとされている。カーカス2は一方のビードから他
方のビードに亘る長さがBPPとされていて、トレッド
プライ6の幅Aとカーカス2の長さBPPは、A/BP
Pが0.40〜0.45とされている。
In the figure, the tread ply 6 comprises a first tread ply 6A having a width A and a second tread ply 6B having a width narrower than the width A, and a second rubber thickness at an edge of the ply 6. The buttress portion 5A has a size I. The length of the carcass 2 from one bead to the other bead is BPP, and the width A of the tread ply 6 and the length BPP of the carcass 2 are A / BP.
P is set to 0.40 to 0.45.

【0010】ここで、A/BPPが0.40以下である
とカーカス2の変形を抑制する効果が少なくなってリム
外れ性は向上しないし、A/BPPが0.45以上にな
ると乗心地におけるショックの強さが悪化して実用に適
さなく、最適値は0.41程度である。更に、巻上げ端
4における第1ゴム厚みEは2.5mm〜3.5mmと
されていて、この厚みEに対して前述した第2ゴム厚み
Iは9.0mm〜10.0mmとされており、第1ゴム
厚みEに対して第2ゴム厚みIは6.0mm〜8.0m
mの増厚とされている。
When A / BPP is 0.40 or less, the effect of suppressing the deformation of the carcass 2 is reduced and the rim detachability is not improved, and when A / BPP is 0.45 or more, the ride comfort is improved. The shock strength deteriorates and it is not suitable for practical use, and the optimum value is about 0.41. Further, the first rubber thickness E at the winding end 4 is 2.5 mm to 3.5 mm, and the second rubber thickness I described above is 9.0 mm to 10.0 mm with respect to this thickness E, The second rubber thickness I is 6.0 mm to 8.0 m with respect to the first rubber thickness E.
It is said that the thickness is increased by m.

【0011】増厚量が6.0mm以下であればバットレ
ス部5Aの変形を抑制する効果が少なく、逆に、8.0
mm以上の増厚であると剛性が高くなりすぎて乗心地が
悪くなり、望ましくは第1ゴム厚みEは2.5mm、第
2ゴム厚みIは9.0mmとされる。次に、タイヤサイ
ズ155/65R13 73Sを対象として従来例、本
発明実施例、比較例についての試験データの結果は下記
の表1に示す。
When the thickness increase amount is 6.0 mm or less, the effect of suppressing the deformation of the buttress portion 5A is small, and conversely, it is 8.0.
When the thickness is more than or equal to mm, the rigidity becomes too high and the riding comfort deteriorates. Desirably, the first rubber thickness E is 2.5 mm and the second rubber thickness I is 9.0 mm. Next, the results of the test data for the tire size 155 / 65R13 73S for the conventional example, the present invention example, and the comparative example are shown in Table 1 below.

【0012】但し、タイヤ内圧は2.0kg/cm2
ある。
However, the tire internal pressure is 2.0 kg / cm 2 .

【0013】[0013]

【表1】 [Table 1]

【0014】上記の表1において、従来例はリム外れ内
圧は1.5kg/cm2 であったのに対し、本発明実施
例および比較例はいずれも1.2kg/cm2 であり、
リム外れ性能が向上している。一方、比較例は操安性、
乗心地が悪くなっている。
In Table 1 above, the rim detachment internal pressure was 1.5 kg / cm 2 in the conventional example, whereas it was 1.2 kg / cm 2 in both the inventive example and the comparative example.
Rim removal performance is improved. On the other hand, the comparative example is
The riding comfort is getting worse.

【0015】[0015]

【発明の効果】以上詳述したように、本発明によれば、
操安性、乗心地性およびリム組性をいずれも損うことな
くリム外れ性を向上できる。
As described in detail above, according to the present invention,
It is possible to improve the rim detachability without impairing the handling stability, riding comfort and rim assembly property.

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

【図1】本発明実施例のタイヤ断面図である。FIG. 1 is a sectional view of a tire according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

T タイヤ 1 ビードコア 2 カーカス 4 巻上げ端 5 サイドウオール部 5A バットレス部 6 トッププライ E 第1ゴム厚み I 第2ゴム厚み T tire 1 bead core 2 carcass 4 hoisting end 5 side wall part 5A buttress part 6 top ply E first rubber thickness I second rubber thickness

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 一方のビードコア(1)と他方のビード
コア(1)とを連結するラジアルカーカス(2)を備
え、該カーカス(2)の両端をビードコア(1)に巻上
げてその巻上げ端(4)をタイヤ最大幅のサイドウオー
ル部(5)に位置させ、前記ラジアルカーカス(2)の
トレッド対応部分の外周にトレッドプライ(6)を配置
している乗用車用ラジアルタイヤ(T)において、 トレッドプライ(6)のエッジが位置するバットレス部
(5A)の第2ゴム厚み(I)を前記サイドウオール部
(5)に位置する巻上げ端(4)の第1ゴム厚み(E)
に対して増厚していることを特徴とする乗用車用ラジア
ルタイヤ。
1. A radial carcass (2) for connecting one bead core (1) to the other bead core (1) is provided, and both ends of the carcass (2) are wound around the bead core (1) and the winding end (4) is provided. ) Is located on the side wall portion (5) of the tire maximum width, and the tread ply (6) is arranged on the outer circumference of the tread corresponding portion of the radial carcass (2). The second rubber thickness (I) of the buttress portion (5A) where the edge of (6) is located is the first rubber thickness (E) of the winding end (4) located in the side wall portion (5).
Radial tires for passenger cars characterized by being thicker than
【請求項2】 前記ラジアルカーカス(2)のビードか
らビードまでの長さをBPPとし、かつ、前記トレッド
プライ(6)の幅をAとしたとき、A/BPPの値を
0.40〜0.45に設定し、前記巻上げ端(4)にお
けるサイドウオール部(5)の第1ゴム厚み(E)を
2.5〜3.5mmに設定しており、更に、前記トレッ
ドプライ(6)のエッジにおける第2ゴム厚み(I)を
9.0〜10.0mmに設定しているとともに、前記第
2ゴム厚み(I)が第1ゴム厚み(E)に対して6.0
mm〜8.0mmの増厚とされていることを特徴とする
請求項1記載の乗用車用ラジアルタイヤ。
2. When the bead-to-bead length of the radial carcass (2) is BPP and the width of the tread ply (6) is A, the value of A / BPP is 0.40 to 0. .45, the first rubber thickness (E) of the side wall portion (5) at the winding end (4) is set to 2.5 to 3.5 mm, and further the tread ply (6) of The second rubber thickness (I) at the edge is set to 9.0 to 10.0 mm, and the second rubber thickness (I) is 6.0 with respect to the first rubber thickness (E).
The radial tire for a passenger vehicle according to claim 1, wherein the radial tire has an increased thickness of mm to 8.0 mm.
JP6007168A 1994-01-26 1994-01-26 Radial tire for car Pending JPH07205620A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6007168A JPH07205620A (en) 1994-01-26 1994-01-26 Radial tire for car

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6007168A JPH07205620A (en) 1994-01-26 1994-01-26 Radial tire for car

Publications (1)

Publication Number Publication Date
JPH07205620A true JPH07205620A (en) 1995-08-08

Family

ID=11658562

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6007168A Pending JPH07205620A (en) 1994-01-26 1994-01-26 Radial tire for car

Country Status (1)

Country Link
JP (1) JPH07205620A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015190198A1 (en) * 2014-06-13 2015-12-17 株式会社ブリヂストン Tire
CN110167767A (en) * 2017-03-10 2019-08-23 横滨橡胶株式会社 Pneumatic tire and its manufacturing method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015190198A1 (en) * 2014-06-13 2015-12-17 株式会社ブリヂストン Tire
JP2016002810A (en) * 2014-06-13 2016-01-12 株式会社ブリヂストン tire
CN110167767A (en) * 2017-03-10 2019-08-23 横滨橡胶株式会社 Pneumatic tire and its manufacturing method
CN110167767B (en) * 2017-03-10 2021-04-09 横滨橡胶株式会社 Pneumatic tire and method for manufacturing same

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