JP3158060B2 - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JP3158060B2 JP3158060B2 JP32693696A JP32693696A JP3158060B2 JP 3158060 B2 JP3158060 B2 JP 3158060B2 JP 32693696 A JP32693696 A JP 32693696A JP 32693696 A JP32693696 A JP 32693696A JP 3158060 B2 JP3158060 B2 JP 3158060B2
- Authority
- JP
- Japan
- Prior art keywords
- groove
- tread
- tire
- linear
- groove wall
- 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.)
- Expired - Fee Related
Links
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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Tires In General (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、トレッド部におい
てベアの発生を防止しう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 capable of preventing occurrence of bears in a tread portion.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】空気入
りタイヤは、加硫金型を用いた加硫工程により、トレッ
ド面の形状が決定される。加硫工程では、タイヤ生カバ
ーが加硫金型のタイヤ成形面に向けて強い圧力で押し当
てられまた加熱される。この際、加硫金型とタイヤ生カ
バーとの間に空気が残存していると、加硫後のタイヤに
は、残存空気が占める空間により表面が陥没したベアが
発生し、タイヤの外観不良を招くという問題がある。2. Description of the Related Art The shape of a tread surface of a pneumatic tire is determined by a vulcanizing process using a vulcanizing mold. In the vulcanizing step, the green tire cover is pressed against the tire molding surface of the vulcanizing mold with a strong pressure and heated. At this time, if air remains between the vulcanizing mold and the raw tire cover, the vulcanized tire has a bear whose surface is depressed due to the space occupied by the remaining air, and the tire has poor appearance. There is a problem of inviting.
【０００３】従来、図８に示す如く、加硫金型ａとタイ
ヤ生カバーｂとの間の空気は、加硫金型のトレッド成形
面に形成された多数のベントホールｃから外部に排出さ
れる。ところが、ベントホールｃは、トレッドゴムゲー
ジの厚い部分、すなわちトレッド面の接地部ｄを成形す
る位置に設けられることが多い。Conventionally, as shown in FIG. 8, air between a vulcanizing mold a and a raw tire cover b is discharged outside through a large number of vent holes c formed on a tread molding surface of the vulcanizing mold. You. However, the vent hole c is often provided at a thick portion of the tread rubber gauge, that is, at a position where the ground contact portion d on the tread surface is formed.
【０００４】このため、加硫中にトレッド溝の溝壁成形
部ｆとタイヤ生カバーｂとの間に空気が残存した場合に
は、この空気がベントホールｃに到達するまでに時間を
要し、その間に加硫反応が進むと前記空気の排出ができ
なくなり、前記ベアが生じてしまう。[0004] Therefore, if air remains between the groove wall forming portion f of the tread groove and the raw tire cover b during vulcanization, it takes time for the air to reach the vent hole c. If the vulcanization reaction proceeds during that time, the air cannot be discharged, and the bear is generated.
【０００５】特にトレッド溝が、溝壁の傾斜がなだらか
でかつ広範囲にわたるような溝形状を有する空気入りタ
イヤにおいては、かかる溝壁にベアが生じやすくなる。[0005] In particular, in a pneumatic tire in which the tread groove has a groove shape in which the inclination of the groove wall is gentle and wide, a bear is likely to be formed on the groove wall.
【０００６】なお、金型の溝壁成形部ｆにベントホール
ｃを設けることも考えられる。しかしながら、ベントホ
ールｃには加硫中の生ゴムも流れ込み、これが加硫後の
タイヤの外表面から突出する小さな柱状の突起（以下、
「スピュー」という）として多数残存する。It is conceivable to provide a vent hole c in the groove wall forming portion f of the mold. However, the raw rubber during vulcanization also flows into the vent hole c, and this is a small columnar projection (hereinafter, referred to as “projection”) that protrudes from the outer surface of the vulcanized tire.
"Spyu").
【０００７】このスピューを除去することは可能であ
る。しかし、スピューは、通常仕上げ工程においてタイ
ヤを工具に接触させながら回転させることにより除去さ
れるため、溝壁から突出するスピューを除去するのは困
難である。It is possible to remove this spew. However, since the spew is usually removed by rotating the tire in contact with the tool in the finishing step, it is difficult to remove the spew protruding from the groove wall.
【０００８】なお従来、金型ａとタイヤ生カバーｂとの
間の空気を抜く方法として、例えば特開平５−１７７６
４４号公報は、加硫金型の成形面に多数の突起を設ける
ことを提案しているが、この方法では、金型の加工費が
上昇する他、タイヤの外観が悪化するという問題があ
る。Conventionally, as a method of bleeding air between the mold a and the tire raw cover b, for example, Japanese Patent Application Laid-Open No.
No. 44 proposes providing a large number of protrusions on a molding surface of a vulcanization mold, but this method has problems that the processing cost of the mold increases and the tire appearance deteriorates. .
【０００９】本発明は、上記の問題点に鑑み案出された
もので、トレッド部、とりわけトレッド溝も溝壁におい
てベアの発生を防止しうる空気入りタイヤを提供するこ
とを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a pneumatic tire capable of preventing occurrence of a bear on a tread portion, especially a tread groove, at a groove wall.
【００１０】[0010]
【課題を解決するための手段】本発明のうち請求項１記
載の発明は、トレッド面を凹ませたトレッド溝が形成さ
れるとともに、トレッド面の接地部とこの接地部に連な
るトレッド溝の溝壁とを継いで線状にのびる線状突起を
加硫金型により成形してなる空気入りタイヤである。According to the first aspect of the present invention, a tread groove having a recessed tread surface is formed, and a ground portion of the tread surface and a groove of the tread groove connected to the ground portion are provided. This is a pneumatic tire formed by molding a linear projection extending linearly by connecting it to a wall using a vulcanizing mold.
【００１１】また、請求項２記載の発明は、前記線状突
起が、高さＨが０．３〜０．８mm、巾Ｗが０．３〜１．
０mmであることを特徴とする。In the invention according to claim 2, the linear projection has a height H of 0.3 to 0.8 mm and a width W of 0.3 to 1.0.
It is characterized by being 0 mm.
【００１２】また、請求項３記載の発明は、前記トレッ
ド面が、前記線状突起の上又はその近傍にスピュー又は
このスピューを切削したスピュー痕を有することを特徴
とする。The invention according to claim 3 is characterized in that the tread surface has a spew or a spew mark obtained by cutting the spew on or near the linear projection.
【００１３】なお線状突起の「線状」とは、実質的な巾
を有しないもので少なくとも１．５mm以下の巾とする。The term "linear" of the linear projection has no substantial width and has a width of at least 1.5 mm or less.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の一形態を図
面に基づき説明する。本発明の空気入りタイヤは、図１
〜３に示す如く、トレッド面２を凹ませたトレッド溝Ｔ
Ｇが形成されるとともに、トレッド面２の接地部４とこ
の接地部４に連なるトレッド溝ＴＧの溝壁３ｉとを継い
で線状にのびる線状突起５を加硫金型Ｍにより成形した
ことを特徴としている。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a pneumatic tire according to the present invention.
As shown in FIGS. 3 to 3, a tread groove T having a recessed tread surface 2
G is formed, and a linear projection 5 is formed by a vulcanizing mold M to extend linearly by connecting the ground portion 4 of the tread surface 2 and the groove wall 3i of the tread groove TG connected to the ground portion 4. It is characterized by.
【００１５】本実施形態では、図１に示す如く、空気入
りタイヤとして、有機繊維コードをほぼタイヤ半径方向
に沿って配列したラジアル構造のカーカス６と、このカ
ーカス６を締め付けるスチールコードからなる２枚のベ
ルトプライ７Ａ、７Ｂを重ね合わせたベルト層７とを具
えた乗用車用ラジアルタイヤを例示している。In this embodiment, as shown in FIG. 1, a pneumatic tire is composed of a radially structured carcass 6 in which organic fiber cords are arranged substantially in the tire radial direction, and a steel cord for fastening the carcass 6. A radial tire for a passenger car comprising a belt layer 7 in which the belt plies 7A and 7B are overlapped with each other is illustrated.
【００１６】前記トレッド溝ＴＧは、本例では、タイヤ
赤道Ｃの両側に位置して実質的に円周方向に連続して直
線状でのびる排水用の２本の縦溝３Ａ、３Ａと、この縦
溝３Ａに交わる向きにのびる多数の横溝３Ｂとを含んで
構成される。In the present embodiment, the tread grooves TG are two longitudinal grooves 3A, 3A for drainage which are located on both sides of the tire equator C and extend substantially linearly in the circumferential direction. It is configured to include a large number of horizontal grooves 3B extending in a direction crossing the vertical grooves 3A.
【００１７】前記縦溝３Ａは、本実施形態では、タイヤ
軸方向外側に位置する外の溝壁３ｏと、タイヤ軸方向内
側に位置する内の溝壁３ｉと、これらに接続される溝底
３ｂとを含み、前記内の溝壁３ｉが、タイヤ赤道Ｃ側か
らトレッド端側に向けてなだらかに下降して傾斜するも
のを例示する。これによって、図１、２に示す如く、前
記内の溝壁３ｉのタイヤ軸方向長さＬが、縦溝３Ａの溝
巾Ｇｗの５０％以上の広範囲を占めるものを例示してい
る。In the present embodiment, the vertical groove 3A includes an outer groove wall 3o located outside in the tire axial direction, an inner groove wall 3i located inside in the tire axial direction, and a groove bottom 3b connected to these. An example is shown in which the inner groove wall 3i gradually descends and slopes from the tire equator C side toward the tread end side. Thereby, as shown in FIGS. 1 and 2, the tire axial length L of the inner groove wall 3i occupies a wide range of 50% or more of the groove width Gw of the vertical groove 3A.
【００１８】この例示の空気入りタイヤは、正規リムに
リム組みしかつ正規荷重を付加したときに路面と接地す
る接地部４が、接地領域Ｃｒ、Ｓｈ、Ｓｈとなる。そし
て、空気入りタイヤは、前記接地領域Ｃｒ、Ｓｈ間に巾
広でしかも溝容積の大なる前記縦溝３Ａが通ることによ
り、ウエット性能、特に耐ハイドロプレーニング性能を
高めうる点で好ましい。In the pneumatic tire of this example, the ground contact portion 4 that is rim-assembled to the normal rim and that comes into contact with the road surface when a normal load is applied is the contact regions Cr, Sh, and Sh. The pneumatic tire is preferred in that the wide vertical groove 3A having a large groove volume passes between the ground contact areas Cr and Sh, whereby wet performance, particularly hydroplaning resistance, can be enhanced.
【００１９】また、前記縦溝３Ａの内の溝壁３ｉは、タ
イヤ赤道Ｃからなだらかに下降して傾斜することによ
り、外部から容易に視認されるため、かかる溝壁３ｉに
ベアが生じていると著しくタイヤの見映えを損ない商品
価値を失いやすい。The groove wall 3i in the vertical groove 3A is easily seen from the outside by gently descending and inclining from the tire equator C, so that a bear is formed on the groove wall 3i. And the appearance of the tire is significantly impaired, and the commercial value is easily lost.
【００２０】そこで、本実施形態では、トレッド面２の
接地領域Ｃｒと、この接地領域Ｃｒに連なる縦溝３Ａの
溝壁３ｉとを継いで１本の線状にのびる線状突起５を加
硫金型Ｍにより成形することにより、前記内の溝壁３ｉ
でベアが発生するのを防止している。Therefore, in the present embodiment, one linear projection 5 extending in a linear manner is formed by connecting the ground region Cr of the tread surface 2 and the groove wall 3i of the vertical groove 3A connected to the ground region Cr. By molding with the mold M, the inner groove wall 3i is formed.
To prevent the occurrence of bears.
【００２１】前記線状突起５は、横溝３Ｂから、これに
タイヤ周方向で隣り合う横溝３Ｂまでのトレッド単位模
様を１ピッチとした場合、１ピッチ当たり１本かつ前記
横溝３Ｂ、３Ｂ間のほぼ中央位置でタイヤ軸方向にのび
る如く形成されている。また、線状突起５は、タイヤ赤
道Ｃを通る細溝８から前記溝壁３ｉのタイヤ軸方向外端
まで連続してのびるものを例示している。When the pitch of the tread unit pattern from the lateral groove 3B to the lateral groove 3B adjacent in the tire circumferential direction is one pitch, the linear projection 5 is one per pitch and almost one pitch between the lateral grooves 3B, 3B. It is formed so as to extend in the tire axial direction at the center position. In addition, the linear projection 5 exemplarily extends from the narrow groove 8 passing through the tire equator C to the outer end of the groove wall 3i in the tire axial direction.
【００２２】前記線状突起５は、図５に示す如く、加硫
金型Ｍの線状凹部１５により加硫成形される。加硫金型
Ｍは、トレッド２を成形するトレッド成形面１０を有
し、この成形面１０に前記縦溝３Ａを成形しうる縦溝成
形部１２が設けられている。As shown in FIG. 5, the linear projection 5 is vulcanized and formed by the linear concave portion 15 of the vulcanizing mold M. The vulcanizing mold M has a tread forming surface 10 for forming the tread 2, and a vertical groove forming portion 12 capable of forming the vertical groove 3A is provided on the forming surface 10.
【００２３】前記縦溝成形部１２は、外の溝壁成形部１
２ｏと、溝底成形部１２ｂと、内の溝壁成形部１２ｉと
を含むとともに、内の溝壁成形部１２ｉに前記線状突起
５を成形するための前記線状凹部１５が刻設される。な
お、この線状凹部１５の刻設は容易に行える。The vertical groove forming section 12 is provided with the outer groove wall forming section 1.
2o, a groove bottom forming part 12b, and an inner groove wall forming part 12i, and the linear recess 15 for forming the linear protrusion 5 is formed in the inner groove wall forming part 12i. . The linear recess 15 can be easily carved.
【００２４】このような線状凹部１５は、加硫工程にお
いて未加硫ゴムが充填されるまでの時間が他の部分より
も長くかかるため、タイヤ生カバーの内の溝壁３ｉと内
の溝壁成形面１２ｉとの間に空気が残存しても前記線状
凹部１５を空気通路として利用してトレッド面２のタイ
ヤ赤道側などの接地部４側へと排気することが可能とな
る。また、トレッド面の接地部４には、通常、多数のベ
ントホール１６が形成されていることにより、トレッド
面２の接地部４に導かれた空気は、このベントホール１
６から容易に排気されることにより、内の溝壁３ｉでベ
アが生じるのを防止しうる。Since the time required for filling the unvulcanized rubber in the vulcanizing step is longer than that of the other portions, the linear concave portion 15 is formed between the groove wall 3i of the raw tire cover and the inner groove. Even if air remains between the wall forming surface 12i, the air can be exhausted to the tread surface 2 side such as the tire equator side of the tread surface 2 by using the linear recess 15 as an air passage. Further, since a large number of vent holes 16 are formed in the ground contact portion 4 of the tread surface, the air guided to the ground contact portion 4 of the tread surface 2 is generally exposed to the vent holes 1.
By easily evacuating from 6, it is possible to prevent the occurrence of bears on the inner groove wall 3i.
【００２５】以上の作用効果をさらに確実とし、かつ効
率の良いものとするためには、加硫済タイヤにおいて、
図４に示す如く前記線状突起５のタイヤ半径方向の高さ
Ｈが０．３〜０．８mm、巾Ｗが０．３〜１．０mmである
ことが最も好ましい。In order to further assure the above-mentioned functions and effects and to improve the efficiency, in a vulcanized tire,
As shown in FIG. 4, it is most preferable that the height H of the linear protrusion 5 in the tire radial direction is 0.3 to 0.8 mm and the width W is 0.3 to 1.0 mm.
【００２６】前記線状突起５の高さＨ又は巾Ｗが小さす
ぎると、空気を排気する効果が相対的に低下する傾向に
あり、逆に線状突起５の高さＨ又は巾Ｗが大きすぎる
と、未加硫ゴムが早期に加硫金型の線状凹部１５に流れ
込み易くなるため、空気通路としての機能が相対的に低
下する傾向にある。If the height H or the width W of the linear projections 5 is too small, the effect of exhausting air tends to decrease relatively, and conversely, the height H or the width W of the linear projections 5 increases. If it is too much, the unvulcanized rubber tends to flow into the linear concave portion 15 of the vulcanization mold early, and the function as an air passage tends to relatively decrease.
【００２７】なお、前記線状突起５の断面は、図４に示
す如く隅部分を円弧で形成することにより、かかる線状
突起５でのベアを防止することも好ましく採用しうる。The cross section of the linear projection 5 may be preferably formed by forming a corner portion with a circular arc as shown in FIG. 4 to prevent a bear at the linear projection 5.
【００２８】また、図５に示した前記加硫金型Ｍは、前
記線状凹部１５の溝上及びその近傍を含む位置に、金型
内部の空気を外部に排気しうるベントホール１６を含む
ことが望ましい。本実施形態では、ベントホール１６Ａ
は、前記線状凹部１５の溝上で、しかも線状凹部１５の
金型赤道側の端部に設けられている。したがって、タイ
ヤ生カバーの加硫中、線状凹部１５を通る空気は、ゴム
ゲージの厚い箇所を加硫する金型赤道側へと導かれた
後、直ちにこのベントホールから排気される点で最も好
ましいものとなる。The vulcanizing mold M shown in FIG. 5 includes a vent hole 16 at a position including the groove of the linear concave portion 15 and a position including the vicinity thereof, which can exhaust air inside the mold to the outside. Is desirable. In this embodiment, the vent hole 16A
Is provided on the groove of the linear concave portion 15 and at the end of the linear concave portion 15 on the mold equator side. Therefore, during vulcanization of the raw tire cover, air passing through the linear concave portion 15 is most preferable in that it is guided to the mold equator for vulcanizing a thick portion of the rubber gauge and then immediately exhausted from the vent hole. It will be.
【００２９】さらに図５に示すベントホール１６Ｂは、
線状凹部１５から微少距離Ｓを隔てた近傍で、しかも線
状凹部１５の金型赤道側の端部に設けられている。前記
微少距離Ｓは、好ましくは５mm以内、さらに好ましくは
３mm以内、より好ましくは１mm以内とするのが望まし
い。これにより、前記ベントホール１６Ｂは、線状凹部
１５を通ってきた空気を排気することが可能となる。Further, the vent hole 16B shown in FIG.
The linear recess 15 is provided in the vicinity of a minute distance S from the linear recess 15 and at the end of the linear recess 15 on the mold equator side. The minute distance S is preferably within 5 mm, more preferably within 3 mm, and more preferably within 1 mm. Thereby, the vent hole 16B can exhaust the air that has passed through the linear concave portion 15.
【００３０】なお加硫金型Ｍは、線状凹部１５から離れ
たベントホール１６Ｃを含むことができ、このベントホ
ールもベアの発生防止に役立つ。ただし、本実施形態で
は、加硫金型Ｍにおいて、トレッド溝を成形する成形部
にはベントホール１６を設けていない。Note that the vulcanizing mold M can include a vent hole 16C remote from the linear concave portion 15, and this vent hole also helps to prevent the occurrence of bears. However, in the present embodiment, in the vulcanizing mold M, no vent hole 16 is provided in a molding portion for molding a tread groove.
【００３１】このような加硫金型Ｍは、タイヤ生カバー
を加硫する際に、前記内の溝壁３ｉと内の溝壁成形部１
２ｉとの間の空気を、未加硫ゴムが遅れて進入する線状
凹部１５を利用してベントホール１６に導いて外部に排
気しうる結果、内の溝壁３ｉでのベアの発生を効果的に
防止し、タイヤの見映えを向上する。When the vulcanizing mold M is vulcanized, the inner groove wall 3i and the inner groove wall forming portion 1
2i can be guided to the vent hole 16 by using the linear recess 15 into which the unvulcanized rubber enters with a delay, and the air can be exhausted to the outside. As a result, the generation of a bear on the inner groove wall 3i is effective. And improve the appearance of the tires.
【００３２】また空気が排気された後は、未加硫ゴムが
前記加硫金型Ｍの線状凹部１５に進入して加硫され、完
成タイヤのトレッド面に、接地部４とこの接地部４に連
なるトレッド溝ＴＧの溝壁とを継いで線状にのびる線状
突起が形成される。After the air is exhausted, the unvulcanized rubber enters the linear concave portion 15 of the vulcanizing mold M and is vulcanized, and the grounding portion 4 and the grounding portion are formed on the tread surface of the completed tire. A linear projection extending linearly is formed by joining with the groove wall of the tread groove TG connected to 4.
【００３３】また、前記加硫金型Ｍのベントホール１６
の位置では、未加硫ゴムもベントホール内に進入する結
果、完成タイヤにスピューとして現れる。したがって、
本実施形態では、図３に示す如く、前記トレッド面は、
前記線状突起５の上又は線状突起５から前記微少距離を
隔てた近傍位置にスピューＳＰが形成されるが、このス
ピューＳＰは、トレッド面２においては、いずれも接地
部４に設けられる。Further, the vent hole 16 of the vulcanizing mold M is used.
In the position, the unvulcanized rubber also enters the vent hole and appears as spew on the finished tire. Therefore,
In the present embodiment, as shown in FIG.
A spew SP is formed on the linear projection 5 or at a position close to the minute distance from the linear projection 5, and the spew SP is provided on the tread surface 2 on the tread surface 4.
【００３４】したがって、スピューＳＰは、タイヤを回
転させかつ工具に接触させることにより、容易に除去で
き、本実施形態では、トレッド面２の前記位置にスピュ
ーＳＰを切削したスピュー痕を有する。Therefore, the spew SP can be easily removed by rotating the tire and bringing it into contact with the tool. In the present embodiment, the spew mark obtained by cutting the spew SP at the position on the tread surface 2 is provided.
【００３５】図６には、本発明の他の実施の形態を示し
ている。この例では、前記と同じトレッドパターンで構
成されており、線状突起５が、前記１ピッチ当たり３本
設けられたものが例示される。FIG. 6 shows another embodiment of the present invention. In this example, it is configured with the same tread pattern as described above, and three linear projections 5 are provided per pitch.
【００３６】図７には、本発明の他の実施の形態を示し
ている。この例では、トレッド溝ＴＧが、タイヤ周方向
にのびる縦溝１９Ａと、タイヤ軸方向にのびる横溝１９
Ｂとを含み、縦溝１９Ａの溝壁２０ｉ、２０ｏが、溝底
２０ｂからほぼ垂直ないし垂直に対して小角度で急勾配
に立ち上がるものを例示している。FIG. 7 shows another embodiment of the present invention. In this example, the tread groove TG has a longitudinal groove 19A extending in the tire circumferential direction and a lateral groove 19A extending in the tire axial direction.
B, the groove walls 20i, 20o of the vertical groove 19A rise from the groove bottom 20b substantially vertically or steeply at a small angle with respect to the vertical.
【００３７】このような溝壁を有する空気入りタイヤに
ついても、線状突起５を設けることにより、溝壁２０
ｉ、２０ｏないし溝壁２０ｉ、２０ｏと接地部４との境
界などでベアの発生を好ましく防止しうるのは言うまで
もない。また、縦溝１９Ａの外の溝壁２０ｏと接地部４
とを継ぐようにも構成したものを示している。The pneumatic tire having such a groove wall is also provided with the linear projection 5 so that the groove wall 20 can be formed.
Needless to say, it is possible to preferably prevent the occurrence of bear at the boundary between i, 20o or the groove wall 20i, 20o and the ground part 4. Further, the groove wall 20o outside the vertical groove 19A and the grounding portion 4
It also shows a structure that is constructed so as to succeed the above.
【００３８】以上詳述したが、本例では線状突起５は、
縦溝３Ａの内の溝壁３ｉとトレッド部２の接地部４とを
継ぐことにより、タイヤ軸方向にのびるものを説明した
が、横溝３Ｂの溝壁とトレッド面の接地部４とを継ぐこ
とにより、タイヤ周方向にのびるように形成することも
できる。また、線状突起５は、波状、ジグザグ状など適
宜屈曲させることもでき、さらには、１本が複数本に分
岐するものなど種々の形状に変形しうる。As described in detail above, in this example, the linear projections 5
Although the groove extending in the axial direction of the tire has been described by connecting the groove wall 3i of the vertical groove 3A and the grounding portion 4 of the tread portion 2, the groove wall of the lateral groove 3B and the grounding portion 4 of the tread surface are connected. Thereby, it can be formed so as to extend in the tire circumferential direction. In addition, the linear projection 5 can be appropriately bent such as a wavy shape or a zigzag shape, and further, can be deformed into various shapes such as a configuration in which one is branched into a plurality.
【００３９】[0039]
【実施例】タイヤサイズが２２５／５５Ｒ１６の空気入
りタイヤ（図１〜３に示す構造）について、本発明の線
状突起のないタイヤ（従来例、比較例）、線状突起を有
する本発明タイヤ（実施例１〜６）を金型で加硫成形し
ベアの発生を検査した。検査の結果を表１に示す。EXAMPLES A pneumatic tire having a tire size of 225 / 55R16 (the structure shown in FIGS. 1 to 3) has no linear projections of the present invention (conventional example, comparative example) and a tire of the present invention having linear projections. (Examples 1 to 6) were vulcanized and molded using a mold, and the occurrence of bare was inspected. Table 1 shows the results of the inspection.
【００４０】[0040]
【表１】 [Table 1]
【００４１】検査の結果、実施例１〜５は、いずれもベ
アが生じていないことが確認できた。なお、実施例６
は、線状突起にベアが１箇所生じていたが、内の溝壁に
は、ベアは生じていなかった。また、従来例、比較例で
は、概ね図３のＰ１、Ｐ２の位置の２箇所ベアが生じて
おり、タイヤの外観を著しく損ねていることが確認でき
た。As a result of the inspection, in Examples 1 to 5, it was confirmed that no bear was generated. Example 6
In (1), one bear was formed on the linear projection, but no bear was formed on the inner groove wall. In addition, in the conventional example and the comparative example, it was confirmed that two bears generally occurred at positions P1 and P2 in FIG. 3 and the appearance of the tire was significantly impaired.
【００４２】[0042]
【発明の効果】以上のように請求項１記載の発明では、
トレッド面の接地部と、トレッド溝の溝壁とを継いで線
状にのびる線状突起を加硫金型により成形しているた
め、タイヤ加硫の際、前記線状の突起を形成する金型の
線状凹部が空気通路の役割を果たし、溝壁面や、空気が
残留しやすいトレッド接地面とトレッド溝との境界部分
などの空気排出性を良好としてベアの発生を抑制しう
る。As described above, according to the first aspect of the present invention,
Since linear projections extending linearly by connecting the ground portion of the tread surface and the groove wall of the tread groove are formed by a vulcanizing mold, the metal forming the linear projections at the time of tire vulcanization is formed. The linear recess of the mold plays the role of an air passage, so that the air discharge property of the groove wall surface or the boundary between the tread ground surface and the tread groove where air tends to remain can be improved, thereby suppressing the occurrence of bears.
【００４３】また、請求項２記載の発明では、前記線状
突起の高さＨ及び巾Ｗを限定したことにより、空気排出
性をさらに良好とし、ベアの発生をより確実に防止しう
る。According to the second aspect of the present invention, the height H and the width W of the linear projection are limited, so that the air discharging property is further improved, and the occurrence of bears can be more reliably prevented.
【００４４】また、請求項３記載の発明では、トレッド
面の接地部は、前記線状突起の上又は近傍にスピュー又
はこのスピューを切削したをスピュー痕を有するため、
前記線状突起を形成する金型の線状凹部を通る空気が、
スピュ−を形作るベントホールから確実に排気される結
果、ベアの発生をさらに確実に防止しうる。According to the third aspect of the present invention, the ground contact portion on the tread surface has a spew mark on or in the vicinity of the linear projection, or a spew mark formed by cutting the spew.
Air passing through the linear concave portion of the mold forming the linear projection,
As a result of the reliable exhaust from the vent hole forming the spew, the occurrence of bears can be more reliably prevented.
【図１】本発明の実施の一形態を示すタイヤ子午断面図
である。FIG. 1 is a meridional section of a tire showing one embodiment of the present invention.
【図２】そのトレッドパターンを展開した展開図であ
る。FIG. 2 is a developed view in which the tread pattern is developed.
【図３】そのトレッドパターンの部分斜視図であるFIG. 3 is a partial perspective view of the tread pattern.
【図４】図２のＡ−Ａ断面図である。FIG. 4 is a sectional view taken along line AA of FIG. 2;
【図５】加硫金型の部分斜視図であるFIG. 5 is a partial perspective view of a vulcanizing mold.
【図６】本発明の他の実施形態を示すトレッドパターン
の展開図である。FIG. 6 is a development view of a tread pattern showing another embodiment of the present invention.
【図７】本発明の他の実施形態を示すトレッド部の部分
斜視図である。FIG. 7 is a partial perspective view of a tread portion showing another embodiment of the present invention.
【図８】従来の技術を説明する断面図である。FIG. 8 is a cross-sectional view illustrating a conventional technique.
２ トレッド部 ３Ａ 縦溝 ３Ｂ 横溝 ３ｉ 縦溝の内の溝壁 ３ｏ 縦溝の外の溝壁 ３ｂ 縦溝の溝底 ４ 接地部 ５ 線状突起 Ｍ 加硫金型 ＴＧ トレッド溝 Ｃ タイヤ赤道 Ｃｒ、Ｓｈ 接地領域 Reference Signs List 2 tread portion 3A vertical groove 3B horizontal groove 3i groove wall inside vertical groove 3o groove wall outside vertical groove 3b groove bottom of vertical groove 4 grounding portion 5 linear projection M vulcanizing mold TG tread groove C tire equator Cr, Sh ground area
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B60C 11/00,11/13 B29C 33/02,35/02 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) B60C 11 / 00,11 / 13 B29C 33 / 02,35 / 02
Claims (3)
れるとともに、トレッド面の接地部とこの接地部に連な
るトレッド溝の溝壁とを継いで線状にのびる線状突起を
加硫金型により成形してなる空気入りタイヤ。A tread groove having a recessed tread surface is formed, and a linear projection extending linearly connecting a ground portion of the tread surface and a groove wall of a tread groove connected to the ground portion is formed by vulcanized gold. A pneumatic tire formed by a mold.
mm、巾Ｗが０．３〜１．０mmであることを特徴とする請
求項１記載の空気入りタイヤ。2. The linear projection has a height H of 0.3 to 0.8.
2. The pneumatic tire according to claim 1, wherein the width and the width are 0.3 to 1.0 mm.
その近傍にスピュー又はこのスピューを切削したスピュ
ー痕を有することを特徴とする請求項１又は２記載の空
気入りタイヤ。3. The pneumatic tire according to claim 1, wherein the tread surface has a spew or a spew mark obtained by cutting the spew on or near the linear projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32693696A JP3158060B2 (en) | 1996-12-06 | 1996-12-06 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32693696A JP3158060B2 (en) | 1996-12-06 | 1996-12-06 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10166814A JPH10166814A (en) | 1998-06-23 |
| JP3158060B2 true JP3158060B2 (en) | 2001-04-23 |
Family
ID=18193433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32693696A Expired - Fee Related JP3158060B2 (en) | 1996-12-06 | 1996-12-06 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3158060B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1075971B1 (en) * | 1999-02-26 | 2007-08-29 | Bridgestone Corporation | Pneumatic tire |
-
1996
- 1996-12-06 JP JP32693696A patent/JP3158060B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10166814A (en) | 1998-06-23 |
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