JP4234468B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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Publication number
JP4234468B2
JP4234468B2 JP2003064409A JP2003064409A JP4234468B2 JP 4234468 B2 JP4234468 B2 JP 4234468B2 JP 2003064409 A JP2003064409 A JP 2003064409A JP 2003064409 A JP2003064409 A JP 2003064409A JP 4234468 B2 JP4234468 B2 JP 4234468B2
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JP
Japan
Prior art keywords
tire
protrusion
belt
pneumatic tire
pneumatic
Prior art date
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Expired - Fee Related
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JP2003064409A
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JP2004268809A (en
Inventor
洋 飯塚
由紀夫 加賀
幸雄 兎沢
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Priority to JP2003064409A priority Critical patent/JP4234468B2/en
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【０００１】
【発明の属する技術分野】
本発明は、重荷重用として好適な空気入りタイヤに関し、さらに詳しくは、高負荷荷重で長期にわたって使用されるときにショルダー部に生じる疲労故障を防止するようにした空気入りタイヤに関する。
【０００２】
【従来の技術】
トラックやバス等に装着される重荷重用空気入りタイヤは、高負荷荷重で長期にわたって使用されると、ショルダー部の繰り返し変形に起因して疲労故障が起き易くなっている。
【０００３】
ところで、重荷重用空気入りタイヤの耐久性を改善する手法として、例えば、トレッド部のコンパウンドを適正化することが行われている（例えば、特許文献１参照。）。しかしながら、トレッド部のコンパウンドの改良するだけでは、上記のようにショルダー部の繰り返し変形に起因する疲労故障を防止することは困難であった。
【０００４】
【特許文献１】
特開２００２−１９４１８号公報
【０００５】
【発明が解決しようとする課題】
本発明の目的は、高負荷荷重で長期にわたって使用される場合であっても、ショルダー部における疲労故障を効果的に防止することを可能にした空気入りタイヤを提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を解決するための本発明の空気入りタイヤは、トレッド部におけるカーカス層の外周側にベルト層を埋設した空気入りタイヤにおいて、タイヤ軸に平行であって前記ベルト層の外周中央点を通る直線とタイヤ外表面との交点にて規定されるベルト投影位置とタイヤ最大幅位置との間の領域に、タイヤ外表面から突出する複数個の突起をタイヤ周方向に沿って断続的に形成し、前記ベルト投影位置と前記タイヤ最大幅位置とのタイヤ径方向の距離Ｒに対して、前記突起を前記ベルト投影位置から距離Ｒの３０〜４０％の位置まで配置したことを特徴とするものである。
【０００７】
このようにベルト投影位置とタイヤ最大幅位置との間の領域に、タイヤ外表面から突出する複数個の突起をタイヤ周方向に沿って断続的に形成したので、ショルダー部の変形を抑制し、空気入りタイヤが高負荷荷重で長期にわたって使用される場合であっても、ショルダー部における疲労故障を効果的に防止することができる。
【０００８】
上記突起はショルダー部の変形を効果的に抑制するためにベルト投影位置に近接することが望まれる。つまり、ベルト投影位置とタイヤ最大幅位置とのタイヤ径方向の距離Ｒに対して、突起をベルト投影位置から距離Ｒの３０〜４０％の位置まで配置する。
【０００９】
同様の理由から、突起の厚さは突起幅方向中央部から両外側へ徐々に薄くすることが好ましい。特に、突起のタイヤ子午線断面形状は半円形にすると良い。また、突起の個数は３０〜１５０個とし、突起のタイヤ周方向長さは５〜５０ｍｍとし、突起の最大厚さは５〜５０ｍｍとすることが好ましい。
【００１０】
【発明の実施の形態】
以下、本発明の構成について添付の図面を参照して詳細に説明する。
【００１１】
図１は本発明の実施形態からなる重荷重用空気入りタイヤを示し、図２及び図３はその要部を示すものである。図１において、１はトレッド部、２はサイドウォール部、３はビード部である。左右一対のビード部３，３間にはカーカス層４が装架されている。カーカス層４のタイヤ幅方向の両端部はそれぞれビードコア５の廻りにタイヤ内側から外側へ折り返されている。また、トレッド部１におけるカーカス層４の外周側には複数のベルトプライを含むベルト層６が埋設されている。
【００１２】
上記空気入りタイヤにおいて、タイヤ軸に平行であってベルト層６の外周中央点Ｃを通る直線とタイヤ外表面との交点にて規定されるベルト投影位置Ｐ1 とタイヤ最大幅位置Ｐ2 との間の領域には、図１〜図３に示すように、半円形の断面形状を有すると共にタイヤ外表面から突出する複数個の突起７がタイヤ周方向に沿って断続的に形成されている。
【００１３】
このようにベルト投影位置Ｐ1 とタイヤ最大幅位置Ｐ2 との間の領域にタイヤ周方向に沿って断続的な突起７を設けた場合、ショルダー部の剛性が高くなるので、ショルダー部の変形を抑制し、その部分におけるカーカスコードの歪みを小さくすることができる。そのため、空気入りタイヤが高負荷荷重で長期にわたって使用される場合であっても、ショルダー部における疲労故障を効果的に防止することができる。但し、上記領域にタイヤ周方向に連続的に延在する突起を形成すると、ショルダー部の放熱性が悪化し、故障の原因になる。そのため、突起７はタイヤ周方向に不連続であることが必要がある。
【００１４】
突起７は、ベルト投影位置Ｐ1 とタイヤ最大幅位置Ｐ2 とのタイヤ径方向の距離をＲとしたとき、ベルト投影位置Ｐ1 から距離Ｒの３０〜４０％の位置まで配置すると良い。つまり、突起７の上端をベルト投影位置Ｐ1 とし、突起７のタイヤ径方向の長さＨを距離Ｒの３０〜４０％にすると良い。この部位に突起７を配置することで、高負荷荷重条件でのショルダー部の変形をより効果的に抑制することができる。ここで、突起７のタイヤ径方向の長さＨが距離Ｒの３０％に未満であるとショルダー部の剛性が不足し、逆に４０％を超えるとショルダー部の放熱性が悪化する。
【００１５】
突起７の厚さは、突起幅方向中央部から両外側へ徐々に薄くすると良い。突起７の厚さを両外側に向けて徐々に薄くした場合、ショルダー部の撓みをより効果的に抑制することができる。突起７のタイヤ子午線断面形状としては、例えば、台形や半円形が可能であるが、図示のような半円形が最も好ましい。
【００１６】
突起７の個数は、タイヤ周上で３０〜１５０個、より好ましくは５０〜８０個にすると良い。突起７の個数が少な過ぎて各突起の寸法が大きくなるとショルダー部の放熱性が悪化し、逆に多過ぎて各突起の寸法が小さくなるとショルダー部の剛性が不足する。
【００１７】
突起７のタイヤ周方向長さＬは、５〜５０ｍｍにすると良い。突起７のタイヤ周方向長さＬが５ｍｍ未満であるとショルダー部の剛性が不足し、逆に５０ｍｍを超えるとショルダー部の放熱性が悪化する。
【００１８】
突起７の最大厚さＴは、５〜５０ｍｍとすると良い。突起７の最大厚さＴが５ｍｍ未満であるとショルダー部の剛性が不足し、逆に５０ｍｍを超えるとショルダー部の放熱性が悪化する。
【００１９】
なお、本発明はショルダー部の形状に基づいて疲労故障に対する耐久性を改善するものであるので、カーカス層やベルト層等のタイヤ構造は上記実施形態に限定されるものではない。
【００２０】
【実施例】
タイヤサイズ１２Ｒ２２．５で、図１のタイヤ構造を有し、タイヤ周方向に断続的な複数個の突起をショルダー部に設けた空気入りタイヤ（実施例）を製作した。但し、ベルト投影位置とタイヤ最大幅位置とのタイヤ径方向の距離Ｒに対して、突起をベルト投影位置から距離Ｒの３６％の位置まで配置した。また、タイヤ周上での突起の個数を７５個とし、突起のタイヤ周方向長さを２０ｍｍとし、突起の相互間隔を２０ｍｍとし、突起の最大厚さを２０ｍｍとした。
【００２１】
また、比較のため、上記突起を設けていないこと以外は、実施例を同じ構造を有する空気入りタイヤ（従来例）を製作した。
【００２２】
上記２種類の空気入りタイヤについて、ＪＡＴＭＡに規定される最大空気圧を充填し、最大負荷能力の１４０％の荷重を負荷し、ドラム試験機により速度４５ｋｍ／ｈでショルダー部が破壊するまでの走行距離を測定した。その結果を、従来例を１００とする指数で示すと、実施例の走行距離は概ね１５０であった。
【００２３】
【発明の効果】
以上説明したように本発明によれば、タイヤ軸に平行であってベルト層の外周中央点を通る直線とタイヤ外表面との交点にて規定されるベルト投影位置とタイヤ最大幅位置との間の領域に、タイヤ外表面から突出する複数個の突起をタイヤ周方向に沿って断続的に形成し、前記ベルト投影位置と前記タイヤ最大幅位置とのタイヤ径方向の距離Ｒに対して、前記突起を前記ベルト投影位置から距離Ｒの３０〜４０％の位置まで配置したから、空気入りタイヤが高負荷荷重で長期にわたって使用される場合であっても、ショルダー部における疲労故障を効果的に防止することができる。従って、本発明の空気入りタイヤは、特に重荷重用空気入りタイヤとして好適である。
【図面の簡単な説明】
【図１】本発明の実施形態からなる重荷重用空気入りタイヤを示すタイヤ子午線半断面図である。
【図２】図１の重荷重用空気入りタイヤの要部を示す側面図である。
【図３】図１の重荷重用空気入りタイヤに設けた突起を拡大して示す斜視図である。
【符号の説明】
１ トレッド部
２ サイドウォール部
３ ビード部
４ カーカス層
５ ビードコア
６ ベルト層
７ 突起
Ｐ1 ベルト投影位置、
Ｐ2 タイヤ最大幅位置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic tire suitable for heavy loads, and more particularly to a pneumatic tire that prevents fatigue failure that occurs in a shoulder portion when used for a long time under a high load load.
[0002]
[Prior art]
Heavy duty pneumatic tires mounted on trucks, buses, etc., are prone to fatigue failure due to repeated deformation of the shoulder when used over a long period of time with a high load.
[0003]
By the way, as a technique for improving the durability of a heavy duty pneumatic tire, for example, optimization of a compound in a tread portion is performed (see, for example, Patent Document 1). However, it has been difficult to prevent fatigue failure due to repeated deformation of the shoulder portion as described above only by improving the compound of the tread portion.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-19418
[Problems to be solved by the invention]
An object of the present invention is to provide a pneumatic tire that can effectively prevent fatigue failure in a shoulder portion even when used for a long time under a high load.
[0006]
[Means for Solving the Problems]
The pneumatic tire of the present invention for solving the above object is a pneumatic tire in which a belt layer is embedded on the outer peripheral side of the carcass layer in the tread portion, and is parallel to the tire axis and passes through the outer peripheral center point of the belt layer. A plurality of protrusions protruding from the tire outer surface are intermittently formed along the tire circumferential direction in a region between the belt projection position and the tire maximum width position defined by the intersection of the straight line and the tire outer surface. The protrusion is arranged from the belt projection position to a position 30 to 40% of the distance R with respect to a distance R in the tire radial direction between the belt projection position and the tire maximum width position. is there.
[0007]
Thus, in the region between the belt projection position and the tire maximum width position, a plurality of protrusions protruding from the outer surface of the tire are intermittently formed along the tire circumferential direction, so that deformation of the shoulder portion is suppressed, Even when the pneumatic tire is used over a long period of time with a high load, fatigue failure in the shoulder portion can be effectively prevented.
[0008]
It is desirable that the projection be close to the belt projection position in order to effectively suppress deformation of the shoulder portion. That is, with respect to the tire radial distance R of the belt projection position and the tire maximum width position, to place the protrusion from the belt projecting position to 30-40% of the positions of the distance R.
[0009]
For the same reason, it is preferable that the thickness of the protrusion is gradually reduced from the center in the protrusion width direction toward both outer sides. In particular, the tire meridian cross-sectional shape of the protrusion is preferably semicircular. The number of protrusions is preferably 30 to 150, the length of the protrusions in the tire circumferential direction is preferably 5 to 50 mm, and the maximum thickness of the protrusions is preferably 5 to 50 mm.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0011]
FIG. 1 shows a heavy-duty pneumatic tire according to an embodiment of the present invention, and FIGS. 2 and 3 show an essential part thereof. In FIG. 1, 1 is a tread portion, 2 is a sidewall portion, and 3 is a bead portion. A carcass layer 4 is mounted between the pair of left and right bead portions 3 and 3. Both ends of the carcass layer 4 in the tire width direction are folded around the bead core 5 from the tire inner side to the outer side. A belt layer 6 including a plurality of belt plies is embedded on the outer peripheral side of the carcass layer 4 in the tread portion 1.
[0012]
In the pneumatic tire, a belt projection position P 1 and a tire maximum width position P 2 defined by an intersection of a straight line that is parallel to the tire axis and passes through the outer peripheral center point C of the belt layer 6 and the tire outer surface. As shown in FIG. 1 to FIG. 3, a plurality of protrusions 7 having a semicircular cross-sectional shape and projecting from the outer surface of the tire are intermittently formed along the tire circumferential direction.
[0013]
In this way, when the intermittent projection 7 is provided along the tire circumferential direction in the region between the belt projection position P 1 and the tire maximum width position P 2 , the rigidity of the shoulder portion is increased, so that the deformation of the shoulder portion is increased. And the distortion of the carcass cord in that portion can be reduced. Therefore, even when the pneumatic tire is used for a long time with a high load load, fatigue failure in the shoulder portion can be effectively prevented. However, if protrusions extending continuously in the tire circumferential direction are formed in the region, the heat dissipation of the shoulder portion is deteriorated, causing a failure. Therefore, the protrusion 7 needs to be discontinuous in the tire circumferential direction.
[0014]
The protrusion 7 is preferably arranged from the belt projection position P 1 to a position 30 to 40% of the distance R, where R is the distance in the tire radial direction between the belt projection position P 1 and the tire maximum width position P 2 . That is, it is preferable that the upper end of the protrusion 7 is the belt projection position P 1 and the length H of the protrusion 7 in the tire radial direction is 30 to 40% of the distance R. By disposing the protrusion 7 at this portion, the deformation of the shoulder portion under a high load load condition can be more effectively suppressed. Here, if the length H of the protrusion 7 in the tire radial direction is less than 30% of the distance R, the rigidity of the shoulder portion is insufficient, and conversely if it exceeds 40%, the heat dissipation of the shoulder portion is deteriorated.
[0015]
The thickness of the protrusion 7 may be gradually decreased from the center in the protrusion width direction toward both outer sides. When the thickness of the protrusion 7 is gradually reduced toward both outer sides, the bending of the shoulder portion can be more effectively suppressed. The tire meridian cross-sectional shape of the protrusion 7 can be, for example, a trapezoid or a semicircular shape, but the semicircular shape as illustrated is most preferable.
[0016]
The number of protrusions 7 is 30 to 150, more preferably 50 to 80 on the tire circumference. If the number of projections 7 is too small and the size of each projection is increased, the heat dissipation of the shoulder portion is deteriorated. Conversely, if the number of projections is too large and the size of each projection is reduced, the rigidity of the shoulder portion is insufficient.
[0017]
The circumferential length L of the protrusion 7 is preferably 5 to 50 mm. If the length L in the tire circumferential direction of the protrusion 7 is less than 5 mm, the rigidity of the shoulder portion is insufficient, and conversely if it exceeds 50 mm, the heat dissipation of the shoulder portion is deteriorated.
[0018]
The maximum thickness T of the protrusion 7 is preferably 5 to 50 mm. If the maximum thickness T of the protrusion 7 is less than 5 mm, the rigidity of the shoulder portion is insufficient, and conversely if it exceeds 50 mm, the heat dissipation of the shoulder portion is deteriorated.
[0019]
In addition, since this invention improves the durability with respect to fatigue failure based on the shape of a shoulder part, tire structures, such as a carcass layer and a belt layer, are not limited to the said embodiment.
[0020]
【Example】
A pneumatic tire (Example) having a tire size of 12R22.5 and having the tire structure of FIG. 1 and having a plurality of intermittent protrusions on the shoulder in the tire circumferential direction was manufactured. However, with respect to the distance R in the tire radial direction between the belt projection position and the tire maximum width position, the protrusion was disposed from the belt projection position to a position 36% of the distance R. The number of protrusions on the tire circumference was 75, the length of the protrusions in the tire circumferential direction was 20 mm, the distance between the protrusions was 20 mm, and the maximum thickness of the protrusions was 20 mm.
[0021]
For comparison, a pneumatic tire (conventional example) having the same structure as the example was manufactured except that the protrusion was not provided.
[0022]
For the above two types of pneumatic tires, the maximum air pressure specified by JATMA is filled, a load of 140% of the maximum load capacity is applied, and the travel distance until the shoulder part is destroyed at a speed of 45 km / h by a drum tester Was measured. When the result is indicated by an index with the conventional example being 100, the traveling distance of the example is approximately 150.
[0023]
【The invention's effect】
As described above, according to the present invention, between the belt projection position and the tire maximum width position defined by the intersection of the straight line that is parallel to the tire axis and passes through the outer peripheral center point of the belt layer and the tire outer surface. A plurality of protrusions protruding from the outer surface of the tire are intermittently formed in the tire circumferential direction, and the distance R in the tire radial direction between the belt projection position and the tire maximum width position is Since the protrusions are arranged from the belt projection position to a position 30 to 40% of the distance R , even when a pneumatic tire is used for a long time under a high load load, fatigue failure in the shoulder portion is effectively prevented. can do. Therefore, the pneumatic tire of the present invention is particularly suitable as a heavy duty pneumatic tire.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a tire meridian showing a heavy duty pneumatic tire according to an embodiment of the present invention.
2 is a side view showing a main part of the heavy duty pneumatic tire of FIG. 1; FIG.
3 is an enlarged perspective view showing a protrusion provided on the heavy duty pneumatic tire of FIG. 1; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Carcass layer 5 Bead core 6 Belt layer 7 Protrusion P 1 Belt projection position,
P 2 tire maximum width position

Claims (4)

トレッド部におけるカーカス層の外周側にベルト層を埋設した空気入りタイヤにおいて、タイヤ軸に平行であって前記ベルト層の外周中央点を通る直線とタイヤ外表面との交点にて規定されるベルト投影位置とタイヤ最大幅位置との間の領域に、タイヤ外表面から突出する複数個の突起をタイヤ周方向に沿って断続的に形成し、前記ベルト投影位置と前記タイヤ最大幅位置とのタイヤ径方向の距離Ｒに対して、前記突起を前記ベルト投影位置から距離Ｒの３０〜４０％の位置まで配置した空気入りタイヤ。In a pneumatic tire in which a belt layer is embedded on the outer peripheral side of the carcass layer in the tread portion, the belt projection defined by the intersection of a straight line that is parallel to the tire axis and passes through the outer peripheral center point of the belt layer and the outer surface of the tire A plurality of protrusions protruding from the outer surface of the tire intermittently along the tire circumferential direction in a region between the position and the tire maximum width position, and the tire diameter between the belt projection position and the tire maximum width position A pneumatic tire in which the protrusion is disposed from the belt projection position to a position 30 to 40% of the distance R with respect to a direction distance R. 前記突起の厚さを突起幅方向中央部から両外側へ徐々に薄くした請求項１に記載の空気入りタイヤ。The pneumatic tire according to claim 1 , wherein the thickness of the protrusion is gradually reduced from the center in the protrusion width direction toward both outer sides. 前記突起のタイヤ子午線断面形状を半円形にした請求項１に記載の空気入りタイヤ。The pneumatic tire according to claim 1 , wherein a tire meridian cross-sectional shape of the protrusion is a semicircular shape. 前記突起の個数を３０〜１５０個とし、前記突起のタイヤ周方向長さを５〜５０ｍｍとし、前記突起の最大厚さを５〜５０ｍｍとした請求項１〜３のいずれかに記載の空気入りタイヤ。The pneumatic according to any one of claims 1 to 3 , wherein the number of the protrusions is 30 to 150, the tire circumferential length of the protrusion is 5 to 50 mm, and the maximum thickness of the protrusion is 5 to 50 mm. tire.
JP2003064409A 2003-03-11 2003-03-11 Pneumatic tire Expired - Fee Related JP4234468B2 (en)

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JP5886532B2 (en) * 2011-02-25 2016-03-16 株式会社ブリヂストン tire
JP5482758B2 (en) * 2011-09-28 2014-05-07 横浜ゴム株式会社 Pneumatic tire
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