JPS62199503A - Pneumatic radial tire - Google Patents
Pneumatic radial tireInfo
- Publication number
- JPS62199503A JPS62199503A JP61041457A JP4145786A JPS62199503A JP S62199503 A JPS62199503 A JP S62199503A JP 61041457 A JP61041457 A JP 61041457A JP 4145786 A JP4145786 A JP 4145786A JP S62199503 A JPS62199503 A JP S62199503A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- carcass layer
- straight line
- radial
- side outer
- 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.)
- Granted
Links
- 239000011324 bead Substances 0.000 abstract description 14
- 238000000926 separation method Methods 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 5
- 238000004804 winding Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 241000254043 Melolonthinae Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012821 model calculation Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- B60C13/003—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof characterised by sidewall curvature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
- Tires In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、空気入りラジアルタイヤ、特に重荷重用空気
入りラジアルタイヤの外表面形状の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in the outer surface shape of a pneumatic radial tire, particularly a heavy-duty pneumatic radial tire.
重荷重用空気入りラジアルタイヤは、一般にタイヤ１本
当りに作用する荷重が高く、耐久性の面で種々の問題が
ある。すなわち、タイヤ部位別にみると、ベルト部のベ
ルトエツジでのセパレーション、サイド部付近のカーカ
ス層におけるコードとその周辺ゴム（クッションゴム、
フィラーゴム）との剥離現象、さらに、ビード部のビー
ドコア廻りでのカーカス層巻き上げ端末からのセパレー
ション等の多くの問題がある。Pneumatic radial tires for heavy loads generally have a high load acting on each tire, and have various problems in terms of durability. In other words, looking at each part of the tire, there is separation at the belt edge of the belt, cords and surrounding rubber in the carcass layer near the side parts (cushion rubber,
There are many problems such as peeling off from the carcass layer (filler rubber) and separation from the winding end of the carcass layer around the bead core at the bead portion.
このため、従来、例えばビード部でのセパレーションの
発生を抑制するために、ビード部にいわゆる補強層（チ
ェーファ−）を配置しているが、十分に満足の行くもの
ではない（特開昭４９−９０２号公報、特開昭４９−１
１３３０３号公報、特開昭５０−６３６０１号公報等）
。For this reason, conventionally, for example, a so-called reinforcing layer (chafer) has been disposed at the bead portion in order to suppress the occurrence of separation at the bead portion, but this is not fully satisfactory (Japanese Unexamined Patent Application Publication No. 49/1989). Publication No. 902, JP-A-49-1
13303, JP-A-50-63601, etc.)
.
本発明は、タイヤサイド外表面形状を特定することによ
り耐久性を向上させた空気入りラジアルタイヤを提供す
ることを目的とする。An object of the present invention is to provide a pneumatic radial tire with improved durability by specifying the outer surface shape of the tire side.
このため、本発明は、カーカス層の上にベルト層を有す
るラジアルタイヤの放射方向断面形状において、タイヤ
サイド外表面のタイヤ最大幅位置の表面をタイヤ回転軸
にほぼ直交する直線となすと共に他の表面を複数の直線
とし、該直線と直線との交点をタイヤ断面外方に凸状に
形成したことを特徴とする空気入りラジアルタイヤを要
旨とするものである。Therefore, in the radial cross-sectional shape of a radial tire having a belt layer on a carcass layer, the surface of the tire side outer surface at the tire maximum width position is a straight line substantially perpendicular to the tire rotation axis, and other The gist of the present invention is a pneumatic radial tire characterized by having a plurality of straight lines on its surface, and the intersections of the straight lines being formed in a convex shape outward in the cross section of the tire.
以下、図を参照して本発明の構成について詳しく説明す
る。Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.
第４図は、従来のラジアルタイヤの一例の放射方向半断
面説明図である。この第４図において、１はトレッド、
２は左右一対のビードコア４．４間に装架されたカーカ
ス層であり、トレッド１においてはこのカーカス層２の
外周を取り囲むようにベルト層３が配置されている。ま
た、ビードコア４の上にはビードフィラー５が配置され
、ビード部６におけるカーカス層巻き上げ端末２ａの外
側には、チェーファ−７が設けられており、タイヤはリ
ム９に嵌合されている。図中１ａはトレッド端部を、９
ａはタイヤがリム９より露出する境界部を、Ｗはタイヤ
最大幅をそれぞれ示す。FIG. 4 is a radial half-sectional explanatory diagram of an example of a conventional radial tire. In this Fig. 4, 1 is a tread;
2 is a carcass layer mounted between a pair of left and right bead cores 4.4, and in the tread 1, a belt layer 3 is arranged so as to surround the outer periphery of this carcass layer 2. Further, a bead filler 5 is arranged on the bead core 4, a chafer 7 is provided outside the carcass layer winding end 2a at the bead portion 6, and the tire is fitted onto a rim 9. In the figure, 1a indicates the tread end, 9
a indicates the boundary where the tire is exposed from the rim 9, and W indicates the maximum width of the tire.
この第４図に示す従来のラジアルタイヤにおいては、放
射方向断面形状において、トレッド端部１ａと境界部９
ａとの間で区画されたタイヤサイド外表面Ｔはい（つか
の円弧を連続的に連結したような丸みを帯びた状態とな
っている。In the conventional radial tire shown in FIG. 4, in the radial cross-sectional shape, the tread end 1a and the boundary 9
The tire side outer surface T defined between a and a is rounded as if several circular arcs were connected continuously.
すなわち、タイヤサイド外表面Ｔは、形状的に連続性を
有する。一方、タイヤ内部構造では、ベルト部のベルト
エツジ３ａｓカーカス層巻き上げ端末２ａ、さらにはサ
イド部８におけるカーカス層２とクッションゴム又はフ
ィラーゴム上端との境界８ａ、８ｂにおいて構造上剛性
的に不連続である。このため、これらのベルトエツジ３
ａ、カーカス層巻き上げ端末２ａ、サイド部の境界８ａ
、８ｂの箇所においてセパレーションの発生が散見され
る。特にサイド部の境界８ａ、８ｂの付近は、タイヤ走
行時における屈曲が大であるため、かかる剛性の不連続
性がセバレ・−ジョンの大きな要因となる。That is, the tire side outer surface T has continuity in shape. On the other hand, in the tire internal structure, there is a structural rigidity discontinuity at the belt edge 3as of the belt portion, the carcass layer winding terminal 2a, and further at the boundaries 8a and 8b between the carcass layer 2 and the upper end of the cushion rubber or filler rubber in the side portion 8. . For this reason, these belt edges 3
a, carcass layer winding terminal 2a, side part boundary 8a
, 8b, the occurrence of separation is observed here and there. Particularly in the vicinity of the boundaries 8a and 8b of the side portions, there is a large degree of bending when the tire runs, so such discontinuity in rigidity is a major factor in the separation.
本発明はかかる剛性の不連続性を周辺ゴム厚を増大する
ことにより解消し、構造上剛性的に不連続となりにくい
サイド部８、特にタイヤ最大幅位置のゴム厚を減少する
ことにより走行中のタイヤの屈曲を主としてこの部分に
分担させ、これによりタイヤ全体として、耐久性を向上
せんとしたものである。The present invention eliminates such discontinuity in rigidity by increasing the peripheral rubber thickness, and reduces the rubber thickness at the side portion 8, where discontinuity in rigidity is difficult due to the structure, especially at the maximum width position of the tire. The bending of the tire is mainly shared by this portion, thereby improving the durability of the tire as a whole.
そして本発明タイヤの特徴とするところは、タイヤ内部
構造に変更を与えずにタイヤサイド外表面形状を改良す
ることにより耐久性を改良することにある。第１図は、
本発明のラジアルタイヤの一例の放射方向半断面説明図
である。The tire of the present invention is characterized in that durability is improved by improving the outer surface shape of the tire side without changing the internal structure of the tire. Figure 1 shows
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a radial half-sectional explanatory diagram of an example of a radial tire of the present invention.
この第１図においては、第４図におけると同様の箇所は
同一の番号および記号で表わす。カーカス層２は少なく
とも１層配置されればよく、また、カーカス層２のコー
ドの材質としては、スチール、又はナイロン、ポリエス
テル等のを機繊維を用いればよい。ベルトＭ３は少なく
とも１層、通常は３〜４層積層配置される。ベルト層３
のコードとしては、主にスチールコードが用いられるが
、アラミツド（芳香族ポリアミド繊維コード）等を用い
てもよい。In FIG. 1, the same parts as in FIG. 4 are represented by the same numbers and symbols. At least one carcass layer 2 may be disposed, and the cords of the carcass layer 2 may be made of steel or woven fibers such as nylon or polyester. The belt M3 is arranged in at least one layer, usually three to four layers. belt layer 3
As the cord, a steel cord is mainly used, but aramid (aromatic polyamide fiber cord) or the like may also be used.
本発明においては、第１図に示すように、タイヤ最大幅
位置の表面Ａをタイヤ回転軸にほぼ直交する直線となす
と共に他の表面Ｃ−Ｅを複数の直線で形成している。表
面Ａをタイヤ回転軸にほぼ直交する直線としたのは、構
造上、剛性的に不連続とならない表面Ａの中央部のタイ
ヤ壁肉厚を薄くすることによりタイヤ走行時の変電なる
屈曲による応力を集中させるためである。ここで、トレ
ッド表面Ｂは、曲率大なる円弧状に形成されることは従
来のタイヤと同様である。本発明タイヤは、タイヤ壁の
剛性の変化を減少させるため、タイヤサイド外表面Ｔを
直線の組み合わせとすることにより、この表面形状の不
連続性で前述したタイヤ内部構造の不連続性（ベルト部
のベルトエツジ３ａ、カーカス層巻き上げ端末２ａ、サ
イド部の境界８ａ、８ｂ）を相殺したものである。直線
の数は、特に限定されることはないが、タイヤの片側の
サイド外表面について３本以上とすることが好ましい。In the present invention, as shown in FIG. 1, the surface A at the tire maximum width position is a straight line substantially perpendicular to the tire rotation axis, and the other surfaces CE are formed by a plurality of straight lines. Surface A is made into a straight line that is almost perpendicular to the axis of rotation of the tire.For structural reasons, the thickness of the tire wall at the center of surface A, which is not discontinuous in terms of rigidity, is made thinner to reduce the stress caused by bending caused by electrical transformation when the tire is running. This is to concentrate. Here, the tread surface B is formed in an arcuate shape with a large curvature, as in conventional tires. In order to reduce changes in the rigidity of the tire wall, the tire of the present invention has a combination of straight lines on the outer surface T of the tire side. The belt edge 3a, the carcass layer winding end 2a, and the side boundaries 8a and 8b) are offset. Although the number of straight lines is not particularly limited, it is preferable that the number of straight lines is three or more on one side outer surface of the tire.
これは、３本未満であるとカーカス層２からタイヤサイ
ド外表面Ｔまでの厚さが必要以上に大となる箇所が生じ
てしまうからである。This is because if there are less than three, the thickness from the carcass layer 2 to the tire side outer surface T will be larger than necessary.
また、本発明においては、タイヤサイド外表面Ｔにおけ
る直線と直線との交点はタイヤ断面外方に凸状に形成さ
れる。このようにしたのは（換言すれば、この箇所での
タイヤ厚みを厚くしたこと）、上述した表面形状の不連
続性でタイヤ内部構造の不連続性を相殺する効果を向上
させるためである。Further, in the present invention, the intersection of two straight lines on the tire side outer surface T is formed in a convex shape outward in the tire cross section. The reason for doing this (in other words, increasing the tire thickness at this location) is to improve the effect of offsetting the discontinuity in the internal structure of the tire with the discontinuity in the surface shape described above.
このように、タイヤ内部構造不連続箇所に相当する位置
の外表面厚さを厚くすることにより、不連続性の相殺効
果を向上させ、せん断歪を軽減させることができ、ひい
てはタイヤ耐久性を高めることができる。このことは、
第２図および第３図に示すような簡単なモデル計算から
も確認することができる。In this way, by increasing the thickness of the outer surface at locations corresponding to discontinuities in the tire's internal structure, it is possible to improve the effect of offsetting discontinuities and reduce shear strain, which in turn increases tire durability. be able to. This means that
This can also be confirmed by simple model calculations as shown in FIGS. 2 and 3.
第２図は、ビード部付近のカーカス層２およびカーカス
層巻き上げ端末２ａと外表面ゴムの ４゜厚さδをモデ
ル化したモデルを示す。ｈはタイヤ厚みである。このモ
デルに曲げモーメントＭを作用させたときのカーカス層
巻き上げ端末２ａ点のせん断歪δｘｙを外表面ゴムの厚
さδを種々変化させて求めた値を第３図にプロットした
。FIG. 2 shows a model in which the carcass layer 2 near the bead portion, the carcass layer winding end 2a, and the 4° thickness δ of the outer surface rubber are modeled. h is the tire thickness. The shear strain δxy at the point 2a of the winding end of the carcass layer when a bending moment M is applied to this model is plotted in FIG. 3 by varying the thickness δ of the outer surface rubber.
第３図は、カーカス層巻き上げ端末２ａ点のせん断歪δ
ｘｙと外表面ゴムの厚さの大きさδ／ｈとの関係図であ
る。この第３図から、内部剛性不連続箇所での外表面ゴ
ムの厚さを大きくすると、カーカス層巻き上げ端末２３
点でのせん断歪を小さくできることが判る。したがって
、これにより、端末２ａ点でのセパレーションを抑制す
ることが可能となる。Figure 3 shows the shear strain δ at the carcass layer winding end point 2a.
FIG. 3 is a relationship diagram between xy and the thickness δ/h of the outer surface rubber. From FIG. 3, it can be seen that if the thickness of the outer surface rubber at the internal rigidity discontinuity point is increased, the carcass layer winding terminal 23
It can be seen that the shear strain at a point can be reduced. Therefore, this makes it possible to suppress separation at the terminal 2a point.
以上説明したように本発明によれば、タイヤ外表面形状
を特定したために、タイヤ内部で剛性的に不連続性が生
ずる箇所でのセパレーションの発生を防止でき、タイヤ
耐久性を向上させることができる。As explained above, according to the present invention, since the shape of the tire's outer surface is specified, it is possible to prevent separation from occurring at locations where rigidity discontinuities occur inside the tire, thereby improving tire durability. .
第１図は本発明のラジアルタイヤの一例の放射方向半断
面説明図、第２図はビード部付近のカーカス層およびカ
ーカス層巻き上げ端末と外表面ゴムの厚さをモデル化し
た説明図、第３図はカーカス層巻き上げ端末点のせん断
歪と外表面ゴムの厚さの大きさとの関係図、第４図は従
来のラジアルタイヤの一例の放射方向半断面説明図であ
る。
１・・・トレッド、２・・・カーカス層、３・・・ベル
ト層、４・・・ビードコア、５・・・ビードフィラー、
６・・・ビード部、７・・・チェーファ−１８・・・サ
イド部、Ｔ・・・タイヤサイド外表面。Fig. 1 is a radial half cross-sectional explanatory diagram of an example of the radial tire of the present invention, Fig. 2 is an explanatory diagram modeling the carcass layer near the bead, the carcass layer winding end, and the thickness of the outer surface rubber. The figure is a diagram showing the relationship between the shear strain at the carcass layer winding end point and the thickness of the outer surface rubber, and FIG. 4 is a radial half-sectional explanatory diagram of an example of a conventional radial tire. 1... Tread, 2... Carcass layer, 3... Belt layer, 4... Bead core, 5... Bead filler,
6... Bead part, 7... Chafer-18... Side part, T... Tire side outer surface.
Claims (1)
射方向断面形状において、タイヤサイド外表面のタイヤ
最大幅位置の表面をタイヤ回転軸にほぼ直交する直線と
なすと共に他の表面を複数の直線とし、該直線と直線と
の交点をタイヤ断面外方に凸状に形成したことを特徴と
する空気入りラジアルタイヤ。In the radial cross-sectional shape of a radial tire having a belt layer on the carcass layer, the tire side outer surface at the tire maximum width position is a straight line substantially perpendicular to the tire rotation axis, and the other surfaces are a plurality of straight lines, A pneumatic radial tire characterized in that the intersection of the two straight lines is formed in a convex shape outward of the cross section of the tire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61041457A JPH0717123B2 (en) | 1986-02-28 | 1986-02-28 | Pneumatic radial tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61041457A JPH0717123B2 (en) | 1986-02-28 | 1986-02-28 | Pneumatic radial tires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62199503A true JPS62199503A (en) | 1987-09-03 |
| JPH0717123B2 JPH0717123B2 (en) | 1995-03-01 |
Family
ID=12608901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61041457A Expired - Lifetime JPH0717123B2 (en) | 1986-02-28 | 1986-02-28 | Pneumatic radial tires |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0717123B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04218413A (en) * | 1990-12-19 | 1992-08-10 | Bridgestone Corp | Pneumatic tire |
| JP2003136918A (en) * | 2001-11-07 | 2003-05-14 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2003136919A (en) * | 2001-11-07 | 2003-05-14 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| KR101087369B1 (en) * | 2009-10-27 | 2011-11-25 | 금호타이어 주식회사 | Pneumatic Tire with Straight Shape Side Pert |
-
1986
- 1986-02-28 JP JP61041457A patent/JPH0717123B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04218413A (en) * | 1990-12-19 | 1992-08-10 | Bridgestone Corp | Pneumatic tire |
| JP2003136918A (en) * | 2001-11-07 | 2003-05-14 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2003136919A (en) * | 2001-11-07 | 2003-05-14 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| KR101087369B1 (en) * | 2009-10-27 | 2011-11-25 | 금호타이어 주식회사 | Pneumatic Tire with Straight Shape Side Pert |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0717123B2 (en) | 1995-03-01 |
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