JP2002347409A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JP2002347409A JP2002347409A JP2001156427A JP2001156427A JP2002347409A JP 2002347409 A JP2002347409 A JP 2002347409A JP 2001156427 A JP2001156427 A JP 2001156427A JP 2001156427 A JP2001156427 A JP 2001156427A JP 2002347409 A JP2002347409 A JP 2002347409A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- tip
- cord
- carcass layer
- layer
- 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 claims abstract description 29
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 27
- 239000010410 layer Substances 0.000 description 104
- 239000000835 fiber Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000004760 aramid Substances 0.000 description 3
- 229920003235 aromatic polyamide Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Tires In General (AREA)
- Tyre Moulding (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、一対の環状のビー
ドで両端が巻き返されたカーカス層のビード間の本体部
がラジアルであり、巻き返し部がビード部の剛性を向上
させるべくコード角を傾斜させてある空気入りタイヤに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire that is inclined.
【０００２】[0002]
【従来の技術】現在、空気入りタイヤの主流となってい
るラジアルタイヤは、一対の環状のビード間を補強し、
複数のコードがタイヤ半径方向（子午線方向）に配列す
るカーカス層と、トレッドの下方に位置するカーカス層
をタガ効果で補強し、コードがタイヤ周方向に対し傾斜
した複数のベルト層とを備えた構造が一般的である。ま
た、カーカス層の両端部は、ビードにて外側に巻き返さ
れており、その巻き返し部のコードについてもタイヤ半
径方向に配列しているのが通常であった。2. Description of the Related Art At present, radial tires, which are the mainstream of pneumatic tires, reinforce a space between a pair of annular beads.
A carcass layer in which a plurality of cords are arranged in the tire radial direction (meridian direction), and a plurality of belt layers in which the carcass layer located below the tread is reinforced by a tag effect and the cords are inclined with respect to the tire circumferential direction. The structure is common. In addition, both ends of the carcass layer were wrapped outward by beads, and the cords of the wrapped portion were usually arranged in the tire radial direction.
【０００３】そして、ビード部の剛性を高める目的で、
ビード周りのカーカス層に加えて、長繊維や短繊維で補
強された補強層を設けた空気入りタイヤが、各種知られ
ている。また、このような補強層を設けずに、カーカス
層の巻き返し部のコードをタイヤ半径方向から傾斜させ
ることにより、ビード部の剛性を高めた空気入りタイヤ
も知られている（特開平１１−１７０８０７号公報、特
開平１０−３０５４９３号公報等）。In order to increase the rigidity of the bead portion,
Various types of pneumatic tires provided with a reinforcing layer reinforced with long fibers or short fibers in addition to a carcass layer around a bead are known. Also, a pneumatic tire in which the rigidity of the bead portion is increased by inclining the cord of the rewind portion of the carcass layer from the tire radial direction without providing such a reinforcing layer is also known (JP-A-11-170807). JP-A-10-305493, etc.).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、後者の
ように巻き返し部のコードをタイヤ半径方向から傾斜さ
せると、ビード部の剛性が向上して操縦安定性は改善さ
れるものの、カーカス層の本体部と巻き返し部とで（２
層のカーカス層をバイアス状にした場合は２層間で）コ
ード角度が異なるため、巻き返し部のコードの先端から
コードが剥離し易く、過酷な走行条件では耐久性が低下
するという問題がある。つまり、隣接するコードのコー
ド角度が異なると、走行中に屈曲が生じるタイヤサイド
近傍で、傾斜したコードに角度変化が生じ、隣接するコ
ード間に介在するゴム部に大きな剪断歪と剪断応力が発
生し、疲労破壊によってコードの先端からコードが剥離
し易くなる。However, when the cord of the rewinding portion is inclined from the tire radial direction as in the latter case, the rigidity of the bead portion is improved and the steering stability is improved, but the body portion of the carcass layer is improved. And the rewinding part (2
When the carcass layer is biased, the cord angles are different (between the two layers), so that the cord is apt to peel off from the end of the cord at the rewinding portion, and there is a problem that durability is reduced under severe running conditions. In other words, if the cord angles of adjacent cords are different, an angle change occurs in the inclined cord near the tire side where bending occurs during running, and large shear strain and shear stress occur in the rubber part interposed between adjacent cords In addition, the cord is easily peeled from the tip of the cord due to fatigue fracture.
【０００５】そして、このような剥離現象は、カーカス
層の巻き返し端が、タイヤ断面高さの３０〜７０％に位
置する空気入りタイヤで特に発生し易い傾向がある。[0005] Such a peeling phenomenon tends to occur particularly in a pneumatic tire in which the rewind end of the carcass layer is located at 30 to 70% of the tire section height.
【０００６】そこで、本発明の目的は、カーカス層の巻
き返し部によってビード部付近の剛性を高めながら、し
かも巻き返し部の先端からコードが剥離し難い空気入り
タイヤを提供することにある。Accordingly, an object of the present invention is to provide a pneumatic tire in which the rigidity near the bead portion is increased by the rewinding portion of the carcass layer, and the cord is hardly peeled off from the tip of the rewinding portion.
【０００７】[0007]
【課題を解決するための手段】上記目的は、下記の如き
本発明により達成できる。即ち、本発明の空気入りタイ
ヤは、一対の環状のビードで両端が巻き返された１層以
上のカーカス層を備え、そのカーカス層のビード間の本
体部はコードとタイヤ周方向とのなすコード角が８５〜
９０°である空気入りタイヤにおいて、前記カーカス層
の巻き返し部は、前記コード角が８５〜９０°である先
端部と、その先端部よりタイヤ内周側に配置され前記コ
ード角が３０〜８０°である傾斜部とを有することを特
徴とする。本発明において、コード角はコードとタイヤ
周方向とのなす鋭角側の角度を指す。The above object can be achieved by the present invention as described below. That is, the pneumatic tire of the present invention includes at least one carcass layer in which both ends are wrapped by a pair of annular beads, and a main body portion between the beads of the carcass layer is a cord formed by the cord and the tire circumferential direction. The angle is 85-
In the pneumatic tire that is 90 °, the rewinding portion of the carcass layer has a tip portion having the cord angle of 85 to 90 ° and a cord angle of 30 to 80 ° which is disposed on the tire inner circumferential side from the tip portion. And an inclined portion that is: In the present invention, the cord angle indicates an acute angle between the cord and the tire circumferential direction.
【０００８】上記において、前記巻き返し部の先端位置
が、タイヤ断面高さの３０〜７０％の高さの位置である
ことが好ましい。[0008] In the above, it is preferable that the front end position of the rewinding portion is a position at a height of 30 to 70% of the tire section height.
【０００９】また、前記巻き返し部の長さに占める前記
先端部の長さの割合が、５０％以下であり、前記先端部
の長さが５ｍｍ以上であることが好ましい。It is preferable that the ratio of the length of the tip to the length of the rewinding portion is 50% or less, and the length of the tip is 5 mm or more.
【００１０】更に、コード補強された補強層をタイヤ断
面高さの３０〜７０％の高さの位置にタイヤ外周側の端
辺が位置するように前記巻き返し部に積層し、その補強
層の先端部の前記コード角を８５〜９０°としてあるこ
とが好ましい。[0010] Further, a reinforcing layer reinforced with cords is laminated on the rewinding portion so that an end on the tire outer peripheral side is located at a height of 30 to 70% of a tire sectional height, and a tip of the reinforcing layer is provided. It is preferable that the cord angle of the portion is 85 to 90 °.
【００１１】［作用効果］本発明の空気入りタイヤによ
ると、カーカス層の巻き返し部にコード角が傾斜した傾
斜部とを有するため、周方向の補強成分が増加し、ま
た、カーカス層の本体部とでコードを拘束し合うため、
ビード部付近の剛性を高めることができる。また、巻き
返し部の先端部のコードが殆ど傾斜していないため、本
体部のコードとの間に介在するゴム部に大きな剪断歪や
剪断応力が発生しにくく、コード先端からの剥離が生じ
難くなる。その結果、カーカス層の巻き返し部によって
ビード部付近の剛性を高めながら、しかも巻き返し部の
先端からコードが剥離し難い空気入りタイヤを提供する
ことができる。[Function and Effect] According to the pneumatic tire of the present invention, since the carcass layer has a rewinding portion and an inclined portion having an inclined cord angle, the reinforcing component in the circumferential direction is increased, and the carcass layer has a main body. To bind the code with
The rigidity near the bead portion can be increased. In addition, since the cord at the tip of the rewinding portion is hardly inclined, large shear strain and shear stress are less likely to be generated in the rubber portion interposed between the cord and the main body, and peeling from the cord tip is less likely to occur. . As a result, a pneumatic tire can be provided in which the rigidity near the bead portion is increased by the rewinding portion of the carcass layer, and the cord is hardly peeled off from the tip of the rewinding portion.
【００１２】また、前記巻き返し部の先端位置が、タイ
ヤ断面高さの３０〜７０％の高さの位置である場合、前
述したコード剥離の問題が生じ易くなるところ、上記の
如き作用効果を有する本発明が特に有用になる。When the tip of the rewinding portion is located at a height of 30 to 70% of the tire cross-section height, the above-described problem of cord peeling is likely to occur. The invention will be particularly useful.
【００１３】前記巻き返し部の長さに占める前記先端部
の長さの割合が、５０％以下であり、前記先端部の長さ
が５ｍｍ以上である場合、先端部によるコードの剥離防
止効果が十分となり、しかも先端部が長すぎて、傾斜部
による補強効果を損ないにくいものとなる。When the ratio of the length of the tip to the length of the rewinding portion is 50% or less and the length of the tip is 5 mm or more, the effect of preventing the cord from being peeled off by the tip is sufficient. In addition, the tip is too long, so that the reinforcing effect of the inclined portion is not easily impaired.
【００１４】コード補強された補強層をタイヤ断面高さ
の３０〜７０％の高さの位置にタイヤ外周側の端辺が位
置するように前記巻き返し部に積層し、その補強層の先
端部の前記コード角を８５〜９０°としてある場合、補
強層によってビード部付近の剛性を更に高めることがで
き、しかも、巻き返し部の場合と同様に、補強層のコー
ド先端からの剥離を生じ難くすることができる。[0014] A reinforcing layer reinforced with cords is laminated on the rewinding portion so that an end on the tire outer peripheral side is located at a height of 30 to 70% of a tire cross-sectional height. When the cord angle is 85 to 90 °, the rigidity in the vicinity of the bead portion can be further increased by the reinforcing layer, and the peeling of the reinforcing layer from the cord tip is less likely to occur as in the case of the rewinding portion. Can be.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を参照しながら説明する。図１は本発明の空気
入りタイヤの一例を示す部分断面図であり、図２（ａ）
はそのカーカス層を模式的に示す側面図、図２（ｂ）は
カーカス層のコードの配置を模式的に示す説明図であ
る。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing an example of the pneumatic tire of the present invention, and FIG.
FIG. 2 is a side view schematically showing the carcass layer, and FIG. 2B is an explanatory view schematically showing the arrangement of the cords of the carcass layer.
【００１６】本発明の空気入りタイヤは、図１に示すよ
うに、一対の環状のビード１ａで両端が巻き返された１
層以上のカーカス層１０を備える。なお、空気入りタイ
ヤは、赤道線ＣＬで対称又は略対称な構造になってい
る。本実施形態ではカーカス層１０が１層で構成されて
いる例を示す。As shown in FIG. 1, the pneumatic tire of the present invention has a pair of annular beads 1a having both ends wrapped.
It has a carcass layer 10 of at least one layer. The pneumatic tire has a structure symmetric or substantially symmetric with respect to the equator line CL. In the present embodiment, an example in which the carcass layer 10 is formed of one layer will be described.
【００１７】カーカス層１０のビード１ａ間の本体部１
１は、図２に示すように、コード１１ａとタイヤ周方向
ＰＤとのなすコード角θ1 が８５〜９０°である。この
点は通常のラジアルタイヤと同じであり、ベルト層６と
あいまって、ラジアルタイヤの乗り心地性、耐久性、運
動性能などを好適に発現することができる。カーカス層
１０を構成するコードとしては、ポリエステル、ポリア
ミド、芳香族ポリアミド等の有機繊維、又はスチール等
が挙げられる。The main body 1 between the beads 1a of the carcass layer 10
As shown in FIG. 2, the cord angle 1 of the cord 11a and the tire circumferential direction PD is 85 to 90 °. This point is the same as that of a normal radial tire, and in combination with the belt layer 6, the riding comfort, durability, exercise performance, and the like of the radial tire can be suitably exhibited. Examples of cords that constitute the carcass layer 10 include organic fibers such as polyester, polyamide, and aromatic polyamide, and steel.
【００１８】ベルト層６は、上層６ｂと下層６ａとの２
層構成のものが例示できるが、各層を構成するコードの
タイヤ赤道線ＣＬに対する角度は１０〜３５°が好まし
い。また、上層６ｂの上面に更に周方向にコードを配置
した繊維補強層を設けてもよい。ベルト層６を構成する
コード材は、スチールや芳香族ポリアミド等の有機繊維
など、従来よりベルト層６に用いられる材料がいずれも
使用できる。The belt layer 6 includes an upper layer 6b and a lower layer 6a.
Although a layer structure can be exemplified, the angle of the cord constituting each layer with respect to the tire equator line CL is preferably 10 to 35 °. Further, a fiber reinforcing layer in which cords are further arranged in the circumferential direction may be provided on the upper surface of the upper layer 6b. As the cord material constituting the belt layer 6, any of the materials conventionally used for the belt layer 6, such as organic fibers such as steel and aromatic polyamide, can be used.
【００１９】本発明の空気入りタイヤは、図２に示すよ
うに、カーカス層１０の巻き返し部１２は、コード１２
ａのコード角θ2 が８５〜９０°である先端部１２Ａ
と、その先端部１２Ａよりタイヤ内周側に配置され、コ
ード１２ｂのコード角θ3 が３０〜８０°である傾斜部
１２Ｂとを有することを特徴とする。コード角θ3 は、
ビード部付近の剛性を高める上で、４０〜７０°が好ま
しい。In the pneumatic tire according to the present invention, as shown in FIG.
a 12A having a code angle θ 2 of 85 to 90 °
When disposed in the tire inner circumferential side of the distal end 12A, the code angle theta 3 code 12b is characterized by having an inclined portion 12B is 30 to 80 °. The code angle θ 3 is
In order to increase the rigidity near the bead portion, the angle is preferably 40 to 70 °.
【００２０】この先端部１２Ａの長さは、巻き返し部
（最内周端から先端まで）の長さに占める先端部１２Ａ
の長さの割合で５０％以下で、かつ５ｍｍ以上であるこ
とが好ましい。先端部１２Ａの長さが５ｍｍ未満である
と、コード先端の剥離防止効果が不十分となり、先端部
１２Ａの長さの割合が５０％を超えると、先端部１２Ａ
が長すぎて、傾斜部１２Ｂによる補強効果が減少する傾
向がある。The length of the tip 12A is the length of the tip 12A occupying the length of the rewinding portion (from the innermost end to the tip).
It is preferable that the length ratio is 50% or less and 5 mm or more. If the length of the distal end portion 12A is less than 5 mm, the effect of preventing peeling of the cord distal end becomes insufficient, and if the ratio of the length of the distal end portion 12A exceeds 50%, the distal end portion 12A
Is too long, and the reinforcing effect of the inclined portion 12B tends to decrease.
【００２１】本発明は、特に巻き返し部１２の先端位置
ＰＥが、タイヤ断面高さＨの３０〜７０％の高さの位置
である場合に有効である。また、カーカス層１０が１層
の場合、図１に示すように、本体部１１と巻き返し部１
２とが部分的に隣接された構造の場合に、前述したコー
ド剥離の問題が生じやすいため、本発明が特に有用とな
る。The present invention is particularly effective when the front end position PE of the rewinding portion 12 is at a height of 30 to 70% of the tire sectional height H. When the carcass layer 10 is a single layer, as shown in FIG.
In the case where the structure 2 is partially adjacent to the structure 2, the above-described problem of cord peeling is likely to occur, so that the present invention is particularly useful.
【００２２】本実施形態では、タイヤ最大幅Ｗの位置Ｐ
Ｗよりタイヤ内周側に先端位置ＰＥが配置されている
が、巻き返し部１２の先端位置ＰＥは位置ＰＷの近傍や
タイヤ外周側に配置してもよい。なお、カーカス層が２
層以上の場合、各層の何れかの先端位置ＰＥが、タイヤ
断面高さＨの３０〜７０％の高さの位置である場合に有
効となる。In this embodiment, the position P of the tire maximum width W
Although the distal end position PE is disposed on the inner peripheral side of the tire with respect to W, the distal end position PE of the rewinding portion 12 may be disposed near the position PW or on the outer peripheral side of the tire. The carcass layer is 2
In the case where the number of layers is equal to or more than the number of layers, it is effective when any one of the tip positions PE of the respective layers is located at a height of 30 to 70% of the tire sectional height H.
【００２３】上記の点以外は、通常のラジアルタイヤと
略同じ構造を有している。即ち、図１に示すように、カ
ーカス層１０の両端は、ビード１ａで折り返され、カー
カス層１０の折り返し部１２と本体部１１との間にはゴ
ム硬度が高いビードフィラー１ｂが配置され、ビード部
１が形成されている。また、通常のタイヤと同様にカー
カス層１０の外側にはサイドウォールゴム２ａ、内側に
はインナーライナゴム３が配置され、ベルト層６の外側
にはトレッドゴム４等が配置され、トレッドゴム４の外
周面には所定のパターンが形成される。Except for the above points, the tire has the same structure as that of a normal radial tire. That is, as shown in FIG. 1, both ends of the carcass layer 10 are folded back with beads 1 a, and a bead filler 1 b having a high rubber hardness is arranged between the folded portion 12 of the carcass layer 10 and the main body 11, A part 1 is formed. Further, similarly to a normal tire, the side wall rubber 2a is disposed outside the carcass layer 10, the inner liner rubber 3 is disposed inside the carcass layer 10, the tread rubber 4 and the like are disposed outside the belt layer 6, and the tread rubber 4 is formed. A predetermined pattern is formed on the outer peripheral surface.
【００２４】本発明の空気入りタイヤは、カーカス層の
巻き返し部のコード角度をタイヤ径方向より部分的に変
えたカーカス用プライを使用すること以外は、通常の空
気入りタイヤと同様の製造方法で製造できる。上記のカ
ーカス用プライは円筒状に成型され、例えばビードの配
設後、チューブ状エアバッグが挿入され、内圧によりド
ーナツ状にシェーピングされた後、ベルト層６が常法に
より形成される。The pneumatic tire of the present invention is manufactured in the same manner as a normal pneumatic tire except that a carcass ply is used in which the cord angle of the rewinding portion of the carcass layer is partially changed from the tire radial direction. Can be manufactured. The above-mentioned carcass ply is molded into a cylindrical shape. For example, after disposing a bead, a tubular airbag is inserted and shaped into a donut shape by internal pressure, and then the belt layer 6 is formed by a conventional method.
【００２５】上記のカーカス用プライは、例えば、ゴム
被覆したコードを供給しながら、駆動する貼り付けロー
ラによってコードの先端を、トレイに所望の経路にて貼
り付ける装置を用いたり、また、特開平８−２４４１３
５号公報に記載の製造方法において、カーカス用プライ
の両端（カーカス先端部）をコード角をラジアルにする
ことで作製することができる。For the carcass ply, for example, a device is used in which a rubber-coated cord is supplied and the leading end of the cord is attached to a tray by a driving attaching roller along a desired path. 8-24413
In the manufacturing method described in Japanese Patent Publication No. 5 (1993), both ends (carcass tip) of the carcass ply can be manufactured by making the cord angle radial.
【００２６】［他の実施形態］以下、本発明の他の実施
の形態について説明する。[Other Embodiments] Hereinafter, other embodiments of the present invention will be described.
【００２７】（１）前述の実施形態では、カーカス層１
０が１層で構成されている例を示したが、本発明では、
図３〜図４に示すように、２層以上のカーカス層１０を
設けてもよい。(1) In the above embodiment, the carcass layer 1
Although an example in which 0 is composed of one layer has been described, in the present invention,
As shown in FIGS. 3 and 4, two or more carcass layers 10 may be provided.
【００２８】本実施形態では、カーカス層１０が外層の
本体部１４と折り返し部１６、及び内層の本体部１３と
折り返し部１５の２層で構成されている。各層の折り返
し部１６と折り返し部１５は、コード１５ａ，１６ａの
コード角θ2 が８５〜９０°である先端部１５Ａ，１６
Ａと、その先端部１５Ａ，１６Ａよりタイヤ内周側に配
置され、コード１５ｂ，１６ｂのコード角θ3 が３０〜
８０°である傾斜部１５Ｂ，１６Ｂとを、外層又は内層
の何れかで有していればよい。但し、内外の両層におい
て、各層の折り返し部１６と折り返し部１５が、コード
角θ2 が８５〜９０°である先端部１５Ａ，１６Ａと、
コード角θ3 が３０〜８０°である傾斜部１５Ｂ，１６
Ｂとを有するのが好ましい。更に好ましくは、図４
（ａ）に示すように、傾斜部１５Ｂと傾斜部１６Ｂとが
逆向きに傾斜している場合（好ましくは子午線に対称）
である。In the present embodiment, the carcass layer 10 is composed of two layers: a main body portion 14 and a folded portion 16 of the outer layer, and a main body portion 13 and a folded portion 15 of the inner layer. Folded portion 16 and the folded portion 15 of each layer, the code 15a, the code angle of 16a theta 2 is 85-90 ° tip 15A, 16
And A, the tip portion 15A, are arranged in the tire circumferential side than 16A, code 15b, 16b code angle theta 3 is 30 the
It is only necessary to have the inclined portions 15B and 16B of 80 ° in either the outer layer or the inner layer. However, in both layers of the inner and outer folded portions 16 and the folded portion 15 of each layer, tip 15A code angle theta 2 is 85-90 °, and 16A,
Inclined portion 15B code angle theta 3 is 30 to 80 °, 16
And B is preferable. More preferably, FIG.
As shown in (a), when the inclined part 15B and the inclined part 16B are inclined in the opposite directions (preferably symmetric with the meridian).
It is.
【００２９】各層の折り返し部１６，１５の先端位置Ｐ
Ｅ１，ＰＥ２は、一致していてもよいが、応力の集中を
避ける上で、先端位置ＰＥ１と先端位置ＰＥ２をズラす
ことが好ましい。特に図３に示すように、先端位置ＰＥ
１から若干タイヤ内周側に先端位置ＰＥ２を配置するの
が更に好ましい。The tip position P of the folded portions 16 and 15 of each layer
E1 and PE2 may be the same, but it is preferable to shift the tip position PE1 and the tip position PE2 in order to avoid concentration of stress. In particular, as shown in FIG.
It is more preferable to arrange the tip end position PE2 slightly from 1 to the inner circumferential side of the tire.
【００３０】（２）本発明では、図５〜図６に示すよう
に、ビード部１に補強層２０を有していてもよく、補強
層２０としては、短繊維やコードで補強されたシート状
物が挙げられる。使用されるコードとしては、ポリエス
テル、ポリアミド、芳香族ポリアミド等の有機繊維、又
はスチール等が挙げられる。本発明では、コード補強さ
れた補強層２０をタイヤ断面高さＨの３０〜７０％の高
さの位置にタイヤ外周側の端辺ＰＲが位置するように巻
き返し部１２に積層するのが好ましい。(2) In the present invention, as shown in FIGS. 5 and 6, the bead portion 1 may have a reinforcing layer 20, and the reinforcing layer 20 may be a sheet reinforced with short fibers or cords. State. Examples of the cord used include organic fibers such as polyester, polyamide, and aromatic polyamide, and steel. In the present invention, it is preferable that the reinforcing layer 20 reinforced with cords is laminated on the rewinding portion 12 such that the end side PR on the tire outer peripheral side is located at a height of 30 to 70% of the tire sectional height H.
【００３１】このような補強層２０の先端部２０Ａは、
コード２０ａのコード角θ4 を８５〜９０°としてある
のが好ましい。また、補強層２０は、先端部２０Ａより
タイヤ内周側に配置され、コード２０ｂのコード角θ5
が３０〜８０°である傾斜部２０Ｂとを有することが好
ましい。The tip portion 20A of the reinforcing layer 20 is
The code 20a code angle theta 4 of preferably are a 85-90 °. Further, the reinforcing layer 20 is disposed on the inner circumferential side of the tire from the tip end portion 20A, and the cord angle θ 5 of the cord 20b is set.
Preferably has an inclined portion 20B of 30 to 80 °.
【００３２】このような補強層２０は、カーカス層１０
が１層の場合に特に有効であり、補強層２０のコード配
置は、カーカス層１０の傾斜部１２Ｂと傾斜部２０Ｂと
が逆向きに傾斜することが好ましく、更に好ましくは子
午線に対称である。The reinforcing layer 20 is formed of the carcass layer 10
Is particularly effective in the case of a single layer, and the arrangement of the cords of the reinforcing layer 20 is preferably such that the inclined portion 12B and the inclined portion 20B of the carcass layer 10 are inclined in opposite directions, and more preferably are symmetrical about the meridian.
【００３３】補強層２０のタイヤ外周側の端辺ＰＲは、
折り返し部１２の先端位置ＰＥと一致していてもよい
が、応力の集中を避ける上で、先端位置ＰＥからズラす
ことが好ましい。特に図５に示すように、先端位置ＰＥ
から若干タイヤ内周側に、補強層２０のタイヤ外周側の
端辺ＰＲを配置するのが更に好ましい。The end PR of the reinforcing layer 20 on the tire outer peripheral side is:
It may coincide with the end position PE of the folded portion 12, but it is preferable to shift from the end position PE in order to avoid concentration of stress. In particular, as shown in FIG.
It is more preferable to arrange the end PR of the reinforcing layer 20 on the tire outer peripheral side slightly to the tire inner peripheral side.
【００３４】（３）前述の実施形態では、カーカス層の
両端がビードで外側に巻き返されている例を示したが、
本発明では、カーカス層の両端がビードで内側に巻き返
されていてもよい。その場合でも、カーカス層の巻き返
し部は、コード角が８５〜９０°である先端部と、その
先端部よりタイヤ内周側に配置されコード角が３０〜８
０°である傾斜部とを有することにより、外側に巻き返
す場合と同等の効果が得られる。(3) In the above-described embodiment, an example is shown in which both ends of the carcass layer are wrapped outward with beads.
In the present invention, both ends of the carcass layer may be wrapped inward with beads. Even in that case, the rewinding portion of the carcass layer has a tip portion having a cord angle of 85 to 90 ° and a cord angle of 30 to 8 which is disposed on the tire inner circumferential side from the tip portion.
By having the inclined portion at 0 °, the same effect as in the case of rewinding outward can be obtained.
【００３５】（４）前述の実施形態では、カーカス層の
巻き返し部が、先端部と傾斜部とで構成されている例を
示したが、先端部と傾斜部は徐々にコード角を変化させ
るように中間領域を介在させた方が好ましい。(4) In the above-described embodiment, the example in which the rewinding portion of the carcass layer is constituted by the tip portion and the inclined portion is shown. However, the tip portion and the inclined portion gradually change the cord angle. It is preferable that an intermediate region is interposed between the two.
【００３６】（５）前述の実施形態では、１層の補強層
を巻き返し部の外側に積層する例を示したが、補強層の
配置は、カーカス層の本体部と巻き返し部との間に介在
させたり、ビードフィラーと巻き返し部との間に介在さ
せる等してもよい。また、２層以上の補強層を設けた
り、２箇所以上に補強層を設けてもよい。(5) In the above-described embodiment, an example is shown in which one reinforcing layer is laminated outside the rewinding portion. However, the reinforcing layer is disposed between the main body of the carcass layer and the rewinding portion. Or may be interposed between the bead filler and the rewind portion. Further, two or more reinforcing layers may be provided, or two or more reinforcing layers may be provided.
【００３７】[0037]
【実施例】以下、本発明の構成と効果を具体的に示す実
施例等について説明する。なお、操縦安定性及び亀裂長
さは、次のようにして測定した。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and the like specifically showing the configuration and effects of the present invention will be described below. In addition, the steering stability and the crack length were measured as follows.
【００３８】（１）操縦安定性 実施例等で得られたサイズ２０５／５５Ｒ１６の空気入
りタイヤを空気圧２２０ｋＰａにてリム組み（リム：
６．５Ｊ）して実車に装着し、ドライ時のテストコース
において、パネラーによる実車フィーリングテストを実
施し、その結果を比較例１のタイヤを１００とする指数
値で評価した。この値が大きいほど、操縦性が優れてい
る。(1) Steering stability The pneumatic tire of size 205 / 55R16 obtained in the examples and the like was assembled on a rim at an air pressure of 220 kPa (rim:
6.5J) and mounted on an actual vehicle. On a dry test course, an actual vehicle feeling test was conducted by panelists, and the result was evaluated by an index value with the tire of Comparative Example 1 being 100. The greater this value, the better the maneuverability.
【００３９】（２）亀裂長さ 上記と同じ条件で実車５万ｋｍ走行後に各タイヤを解体
し、カーカス層の巻き返し部の先端の亀裂（セパ）長さ
を測定した。測定は、最も亀裂の長い部分について行っ
た。測定値は小さい程、耐久性が良いことを示す。(2) Crack length Each tire was disassembled after running 50,000 km on an actual vehicle under the same conditions as above, and the length of the crack (separ) at the tip of the rewinding portion of the carcass layer was measured. The measurement was performed on the longest part of the crack. The smaller the measured value, the better the durability.
【００４０】実施例１〜３ ポリエステル１６７０ｄｔｅｘ／２、５２本／５ｃｍの
カーカス用プライを用いて、本体部がコード角９０°、
巻き返し部がコード角６０°の傾斜部とコード角９０°
の先端部（長さは表１の通り）とからなり、巻き返し部
の先端がタイヤ断面高さの６０％となるようにビードで
外側に巻き返したカーカス層を形成し、他の部分は通常
のラジアルタイヤと同様にして、図１に示すようなタイ
ヤサイズ２０５／５５Ｒ１６の空気入りタイヤを試作し
た。Examples 1 to 3 Using a carcass ply of polyester 1670 dtex / 2, 52 pieces / 5 cm, the main body portion had a cord angle of 90 °,
Rewinding part is inclined part with cord angle 60 ° and cord angle 90 °
(The length is as shown in Table 1), and a carcass layer is formed by beading outside with a bead so that the tip of the rewinding portion is 60% of the tire cross-section height, and the other portions are normal. A pneumatic tire having a tire size of 205 / 55R16 as shown in FIG. 1 was prototyped in the same manner as the radial tire.
【００４１】比較例１ 実施例１において、カーカス層の巻き返し部を全てコー
ド角９０°で形成し（コードが全ての位置でラジア
ル）、他の部分は通常のラジアルタイヤと同様にして、
タイヤサイズ２０５／５５Ｒ１６の空気入りタイヤを試
作した。COMPARATIVE EXAMPLE 1 In Example 1, all of the carcass layers were formed at a cord angle of 90 ° (cords were radial at all positions), and the other portions were formed in the same manner as a normal radial tire.
A prototype pneumatic tire having a tire size of 205 / 55R16 was produced.
【００４２】実施例４ 実施例１において、カーカス層の先端部の長さを巻き返
し部の６０％とし、他の部分は通常のラジアルタイヤと
同様にして、タイヤサイズ２０５／５５Ｒ１６の空気入
りタイヤを試作した。Example 4 A pneumatic tire having a tire size of 205 / 55R16 was prepared in the same manner as in Example 1, except that the length of the tip portion of the carcass layer was set to 60% of the rewind portion, and the other portions were the same as a normal radial tire. Prototype made.
【００４３】比較例２ 実施例１において、カーカス層の巻き返し部の先端部を
傾斜部と同じコード角で形成し（即ち傾斜部のみで形成
し）、他の部分は通常のラジアルタイヤと同様にして、
タイヤサイズ２０５／５５Ｒ１６の空気入りタイヤを試
作した。COMPARATIVE EXAMPLE 2 In Example 1, the tip of the rewinding portion of the carcass layer was formed at the same cord angle as the inclined portion (that is, formed only with the inclined portion), and the other portions were the same as those of a normal radial tire. hand,
A prototype pneumatic tire having a tire size of 205 / 55R16 was produced.
【００４４】以上の空気入りタイヤを用いて、前記評価
を行った結果を表１に示す。Table 1 shows the results of the above evaluations using the above pneumatic tires.
【００４５】[0045]
【表１】 表１の結果が示すように、本発明によると、カーカス層
の巻き返し部の先端部をラジアルにすることで、操縦安
定性を改善しながら、コード先端の剥離を防止して耐久
性を高めることができる。[Table 1] As shown in the results of Table 1, according to the present invention, the tip portion of the rewinding portion of the carcass layer is made radial, thereby improving the steering stability, preventing peeling of the cord tip, and increasing the durability. Can be.
【図１】本発明の空気入りタイヤの一例を示す部分断面
図FIG. 1 is a partial sectional view showing an example of a pneumatic tire of the present invention.
【図２】本発明の空気入りタイヤの要部を示す図であ
り、（ａ）はカーカス層を模式的に示す側面図、（ｂ）
はそのコードの配置を模式的に示す説明図FIG. 2 is a view showing a main part of the pneumatic tire of the present invention, wherein (a) is a side view schematically showing a carcass layer, and (b).
Is an explanatory diagram schematically showing the arrangement of the codes
【図３】本発明の空気入りタイヤの他の例を示す部分断
面図FIG. 3 is a partial sectional view showing another example of the pneumatic tire of the present invention.
【図４】本発明の空気入りタイヤの他の例の要部を示す
図であり、（ａ）はカーカス層を模式的に示す側面図、
（ｂ）はそのコードの配置を模式的に示す説明図FIG. 4 is a view showing a main part of another example of the pneumatic tire of the present invention, wherein (a) is a side view schematically showing a carcass layer,
(B) is an explanatory view schematically showing the arrangement of the codes.
【図５】本発明の空気入りタイヤの他の例を示す部分断
面図FIG. 5 is a partial sectional view showing another example of the pneumatic tire of the present invention.
【図６】本発明の空気入りタイヤの他の例の要部を示す
図であり、（ａ）はカーカス層を模式的に示す側面図、
（ｂ）はそのコードの配置を模式的に示す説明図FIG. 6 is a view showing a main part of another example of the pneumatic tire of the present invention, wherein (a) is a side view schematically showing a carcass layer,
(B) is an explanatory view schematically showing the arrangement of the codes.
１ａ ビード １０ カーカス層 １１ カーカス層の本体部 １２ カーカス層の巻き返し部 １２Ａ 先端部 １２Ｂ 傾斜部 １２ａ 先端部のコード １２ｂ 傾斜部のコード １３ 下層カーカス層の本体部 １４ 上層カーカス層の本体部 １５ 下層カーカス層の巻き返し部 １６ 上層カーカス層の巻き返し部 ２０ 補強層 ＰＥ 巻き返し部の先端位置 Ｈ タイヤ断面高さ ＰＤ タイヤ周方向 θ1 〜θ5 コード角1a Bead 10 Carcass Layer 11 Carcass Layer Main Body 12 Carcass Layer Rewinding Part 12A Tip 12B Inclined Part 12a Tip Cord 12b Inclined Cord 13 Lower Carcass Layer Main Body 14 Upper Carcass Layer Main Body 15 Lower Carcass rewinding unit 16 upper end position H tire section height rewinding portion 20 reinforcing layer PE rewinding of the carcass layer PD tire circumferential direction theta 1 through? 5 code angles of the layers
Claims (4)
た１層以上のカーカス層を備え、そのカーカス層のビー
ド間の本体部はコードとタイヤ周方向とのなすコード角
が８５〜９０°である空気入りタイヤにおいて、 前記カーカス層の巻き返し部は、前記コード角が８５〜
９０°である先端部と、その先端部よりタイヤ内周側に
配置され前記コード角が３０〜８０°である傾斜部とを
有することを特徴とする空気入りタイヤ。1. A carcass layer comprising at least one carcass layer having both ends wrapped by a pair of annular beads, and a main body portion between the beads of the carcass layer has a cord angle of 85 to 90 between a cord and a tire circumferential direction. °, the rewinding portion of the carcass layer has a cord angle of 85 to 85
A pneumatic tire comprising: a front end portion having a 90 ° angle; and an inclined portion disposed at an inner peripheral side of the front end portion with the cord angle being 30 to 80 °.
面高さの３０〜７０％の高さの位置である請求項１記載
の空気入りタイヤ。2. The pneumatic tire according to claim 1, wherein a tip position of the rewinding portion is a position at a height of 30 to 70% of a tire sectional height.
部の長さの割合が、５０％以下であり、前記先端部の長
さが５ｍｍ以上である請求項１又は２に記載の空気入り
タイヤ。3. The pneumatic pump according to claim 1, wherein the ratio of the length of the tip to the length of the rewinding portion is 50% or less, and the length of the tip is 5 mm or more. tire.
さの３０〜７０％の高さの位置にタイヤ外周側の端辺が
位置するように前記巻き返し部に積層し、その補強層の
先端部の前記コード角を８５〜９０°としてある請求項
１〜３いずれかに記載の空気入りタイヤ。4. A reinforcing layer reinforced with cords is laminated on the rewinding portion so that an end on the tire outer peripheral side is located at a height of 30 to 70% of a tire sectional height, and a tip of the reinforcing layer is provided. The pneumatic tire according to any one of claims 1 to 3, wherein the cord angle of the portion is 85 to 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001156427A JP4800504B2 (en) | 2001-05-25 | 2001-05-25 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001156427A JP4800504B2 (en) | 2001-05-25 | 2001-05-25 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002347409A true JP2002347409A (en) | 2002-12-04 |
| JP4800504B2 JP4800504B2 (en) | 2011-10-26 |
Family
ID=19000435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001156427A Expired - Fee Related JP4800504B2 (en) | 2001-05-25 | 2001-05-25 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4800504B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018076005A (en) * | 2016-11-10 | 2018-05-17 | 東洋ゴム工業株式会社 | Pneumatic tire |
| JP2019112004A (en) * | 2017-12-26 | 2019-07-11 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Pneumatic tire |
| JP2019112005A (en) * | 2017-12-26 | 2019-07-11 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Pneumatic tire |
| CN111163948A (en) * | 2017-10-02 | 2020-05-15 | 米其林集团总公司 | Tire with reinforced lower region |
| US12043066B2 (en) * | 2017-10-02 | 2024-07-23 | Compagnie Generale Des Etablissements Michelin | Tire having a reinforced lower zone |
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| JP2000229507A (en) * | 1999-02-10 | 2000-08-22 | Bridgestone Corp | Pneumatic radial tire |
| JP2001354013A (en) * | 2000-06-14 | 2001-12-25 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
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| JPS56135304A (en) * | 1980-03-27 | 1981-10-22 | Yokohama Rubber Co Ltd:The | Construction of radial tire |
| JPS59500169A (en) * | 1982-02-11 | 1984-02-02 | ヤ−ヌス ゲゼルシヤフト ミツト ベシユレンクテル ハフトウング | Radial tire and its manufacturing method and device |
| JPS6157405A (en) * | 1984-08-30 | 1986-03-24 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JPH06286410A (en) * | 1993-03-30 | 1994-10-11 | Bridgestone Corp | Pneumatic tire and tire pair for two wheeler |
| JPH07117420A (en) * | 1993-10-27 | 1995-05-09 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JPH08244135A (en) * | 1995-03-09 | 1996-09-24 | Bridgestone Corp | Pneumatic radial tire and production thereof |
| JPH10305493A (en) * | 1997-05-09 | 1998-11-17 | Sumitomo Rubber Ind Ltd | Manufacture of pneumatic radial tire |
| JPH11170807A (en) * | 1997-12-16 | 1999-06-29 | Sumitomo Rubber Ind Ltd | Tire for heavy load |
| JP2000094910A (en) * | 1998-09-21 | 2000-04-04 | Bridgestone Corp | Pneumatic tire and manufacture of pneumatic tire |
| JP2000229507A (en) * | 1999-02-10 | 2000-08-22 | Bridgestone Corp | Pneumatic radial tire |
| JP2001354013A (en) * | 2000-06-14 | 2001-12-25 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018076005A (en) * | 2016-11-10 | 2018-05-17 | 東洋ゴム工業株式会社 | Pneumatic tire |
| CN111163948A (en) * | 2017-10-02 | 2020-05-15 | 米其林集团总公司 | Tire with reinforced lower region |
| US12043066B2 (en) * | 2017-10-02 | 2024-07-23 | Compagnie Generale Des Etablissements Michelin | Tire having a reinforced lower zone |
| JP2019112004A (en) * | 2017-12-26 | 2019-07-11 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Pneumatic tire |
| JP2019112005A (en) * | 2017-12-26 | 2019-07-11 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Pneumatic tire |
| JP7011461B2 (en) | 2017-12-26 | 2022-01-26 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Pneumatic tires |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4800504B2 (en) | 2011-10-26 |
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