JP4094571B2 - Pneumatic radial tire - Google Patents

Pneumatic radial tire Download PDF

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JP4094571B2
JP4094571B2 JP2004059163A JP2004059163A JP4094571B2 JP 4094571 B2 JP4094571 B2 JP 4094571B2 JP 2004059163 A JP2004059163 A JP 2004059163A JP 2004059163 A JP2004059163 A JP 2004059163A JP 4094571 B2 JP4094571 B2 JP 4094571B2
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sipe
wide portion
pneumatic radial
tread surface
radial tire
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JP2005247105A (en
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稔之 大橋
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Description

本発明は、トレッド表面にサイプにサイプが刻まれた空気入りラジアルタイヤに関し、より詳しくはアイス性能と摩耗性能の両立を図った空気入りラジアルタイヤに関する。   The present invention relates to a pneumatic radial tire having a sipe engraved on a tread surface, and more particularly to a pneumatic radial tire that achieves both ice performance and wear performance.

空気入りタイヤにおいて、主溝や横溝の他にトレッド表面に更に幅の狭いサイプを切り刻んで、排水性を向上させてきた。また、氷雪路の走行を目的としたスタッドレスタイヤにおいては、更に多くのサイプを刻み、該サイプのエッジ効果を発揮させ、制動・駆動性能及び旋回性能を向上させてきた。   In a pneumatic tire, in addition to main grooves and lateral grooves, a narrower sipe has been cut on the tread surface to improve drainage. Further, in studless tires intended for running on icy and snowy roads, more sipes have been cut and the edge effect of these sipes has been demonstrated to improve braking / driving performance and turning performance.

図１（ｂ）に示すように、サイプ１は一定の厚みで刻まれることが多かった。例えば、タイヤ幅方向に刻まれたサイプは、制動時になどにおいて負荷される前後力によりサイプ一様に閉塞してしまう。その結果、サイプが本来発揮すべきエッジ効果や除水効果が低下する。このような問題を解決すべく、特許文献１に開示された空気入りタイヤにおいては、図１（ｃ）に示すように、厚みを他の部分より厚くした幅広部２をサイプ１に設け、エッジ効果や除水効果の向上を図っている。
特開平９−２７２３１２号公報 As shown in FIG. 1B, the sipe 1 was often engraved with a constant thickness. For example, a sipe carved in the tire width direction is uniformly blocked by a longitudinal force applied during braking or the like. As a result, the edge effect and the water removal effect that the sipe should demonstrate are reduced. In order to solve such a problem, in the pneumatic tire disclosed in Patent Document 1, as shown in FIG. 1 (c), a wide portion 2 having a thickness larger than other portions is provided in the sipe 1, and the edge The improvement of the effect and water removal effect is aimed at.
Japanese Patent Laid-Open No. 9-272312

特許文献１に係る空気入りタイヤにおいては、サイプ１の開口部３の閉塞を防止できエッジ効果や除水効果が向上する。しかし、幅広部２はトレッド表面Ｔからサイプ底４まで延びているので、サイプ１が刻まれたブロック（陸部）の剛性が低下する。その結果、サイプ１が倒れ込み易くなり接地面積の低下を招き、アイス性能が低下したり偏摩耗が発生することがあった。   In the pneumatic tire according to Patent Literature 1, the opening 3 of the sipe 1 can be prevented from being blocked, and the edge effect and the water removal effect are improved. However, since the wide portion 2 extends from the tread surface T to the sipe bottom 4, the rigidity of the block (land portion) in which the sipe 1 is engraved is lowered. As a result, the sipe 1 tends to fall down, resulting in a decrease in the ground contact area, resulting in a decrease in ice performance or uneven wear.

したがって、本発明の目的は、サイプの開口部の閉塞を抑制しエッジ効果や除水効果を確保し、アイス性能と摩耗性能を向上することにある。   Accordingly, an object of the present invention is to suppress clogging of the opening of the sipe, ensure an edge effect and a water removal effect, and improve ice performance and wear performance.

上記課題を解決するため、鋭意検討した結果、請求項１に記載の発明は、トレッド表面にサイプが刻まれた空気入りラジアルタイヤにおいて、前記サイプは厚みが他の部分より厚い第１幅広部を備え、前記第１幅広部は、トレッド表面から深さ方向に延び前記サイプの底部に至る途中で閉塞し、前記第１幅広部の長さは、前記サイプ全体の長さより短い空気入りラジアルタイヤとした。 As a result of intensive studies to solve the above-described problems, the invention according to claim 1 is directed to a pneumatic radial tire in which a sipe is engraved on a tread surface. The sipe has a first wide portion whose thickness is thicker than other portions. The first wide portion extends in the depth direction from the tread surface and is closed on the way to the bottom of the sipe, and the length of the first wide portion is a pneumatic radial tire shorter than the entire length of the sipe. did.

タイヤ幅方向に刻まれたサイプの場合、制動時などに前後力がサイプに負荷されるとサイプの開口部が閉塞する。しかし、第１幅広部は他の部分より厚いので、第１幅広部の開口部は完全に閉塞せず、サイプによるエッジ効果や除水効果が確保される。また、当該第１幅広部はトレッド表面から延びるがサイプ底まで達していないので、サイプが刻まれた陸部の剛性の低下を抑えられ、接地面積の低下を招くことない。その結果、アイス性能が低下することもなく、段差偏摩耗を抑止することができる。   In the case of a sipe carved in the tire width direction, when a longitudinal force is applied to the sipe during braking, the sipe opening is closed. However, since the first wide portion is thicker than the other portions, the opening of the first wide portion is not completely closed, and the edge effect and water removal effect by sipe are ensured. Further, since the first wide portion extends from the tread surface but does not reach the sipe bottom, it is possible to suppress a decrease in rigidity of the land portion on which the sipe is engraved, and a reduction in the ground contact area is not caused. As a result, uneven uneven wear can be suppressed without lowering the ice performance.

請求項２に記載の発明は、前記サイプは更に厚みが他の部分より厚い第２幅広部を備え、前記第２幅広部は、前記第１幅広部の底部と同じ高さ又はトレッド表面側にある位置からサイプ底まで延び、前記第２幅広部の長さは、前記サイプ全体の長さより短く、前記第１幅広部と前記第２幅広部は、サイプ長さ方向において互いに異なる位置にある請求項１に記載の空気入りラジアルタイヤとした。 According to a second aspect of the present invention, the sipe further includes a second wide portion having a thickness greater than that of the other portion, and the second wide portion is at the same height as the bottom of the first wide portion or on the tread surface side. The length of the second wide portion extends from a certain position to the sipe bottom, and the length of the second wide portion is shorter than the entire length of the sipe, and the first wide portion and the second wide portion are in different positions in the sipe length direction. The pneumatic radial tire according to Item 1 was obtained.

摩耗により第１幅広部が消滅しても第２幅広部が出現するので、サイプの開口部が完全に閉塞することがない。その結果、同様にサイプによるエッジ効果や除水効果が確保される。   Even if the first wide portion disappears due to wear, the second wide portion appears, so that the opening of the sipe is not completely blocked. As a result, the edge effect and the water removal effect by sipe are similarly secured.

本発明によれば、サイプに幅広部を設け、当該幅広部はいずれもトレッド表面からサイプ底まで延びていない構造としたので、サイプの開口部が完全に閉塞することを防止し、サイプによるエッジ効果や除水効果が確保される。また、陸部の剛性低下が抑えられ、サイプの倒れ込みが抑制されるので、アイス性能が低下することもなく、段差偏摩耗を抑止することができる。   According to the present invention, since the sipe is provided with a wide portion, and the wide portion has a structure that does not extend from the tread surface to the sipe bottom, the sipe opening is prevented from being completely closed, and the sipe edge Effectiveness and water removal effect are secured. Moreover, since the rigidity reduction of a land part is suppressed and the fall of a sipe is suppressed, an ice performance does not fall and a step uneven wear can be suppressed.

以下、図面を用いて、本発明に係る空気入りラジアルタイヤの実施形態を説明する。図１（ａ）は、本発明に係る空気入りラジアルタイヤに刻まれたサイプを示す斜視図である。直線状のサイプ１はブロックやリブなどの陸部に刻まれ、サイプ１の全体の長さに比べて長さが短い、第１幅広部２ａと第２幅広部２ｂを備えている。第１幅広部２ａはトレッド表面Ｔからサイプ底４に至る途中まで延びている。第２幅広部２ｂは第１幅広部２ａの底部５ａと同じ高さ、またはそれよりトレッド表面Ｔ側にある位置からサイプ底４まで延びている。 Hereinafter, embodiments of a pneumatic radial tire according to the present invention will be described with reference to the drawings. Fig.1 (a) is a perspective view which shows the sipe carved in the pneumatic radial tire which concerns on this invention. The straight sipe 1 is engraved in a land portion such as a block or a rib, and includes a first wide portion 2a and a second wide portion 2b that are shorter than the entire length of the sipe 1 . The first wide portion 2 a extends halfway from the tread surface T to the sipe bottom 4. The second wide portion 2b extends to the sipe bottom 4 from the same height as the bottom portion 5a of the first wide portion 2a or from a position on the tread surface T side.

図２（ａ）は、サイプ１がブロック１０に刻まれた様子を示す。トレッド表面Ｔにおいては、第１幅広部２ａが出現しているが、第２幅広部２ｂは出現していない。幅広部２ａ、２ｂはブロック１０の端部から離して互いに間隔をおいて配置されている。   FIG. 2A shows a state in which the sipe 1 is cut into the block 10. On the tread surface T, the first wide portion 2a appears, but the second wide portion 2b does not appear. The wide portions 2a and 2b are spaced apart from the end of the block 10 and spaced from each other.

例えば、サイプ１がタイヤ幅方向に刻まれているとする。制動時などに前後力がサイプ１に負荷されると、サイプ１の開口部３が閉塞する。第１幅広部２ａがあるため、第１幅広部の開口部３ａは完全に閉塞せず、サイプ１によるエッジ効果や除水効果が確保される。タイヤの摩耗が進行して第１幅広部２ａが消滅しても、第２幅広部２ｂが出現するので、同様に、サイプ１によるエッジ効果や除水効果が確保される。   For example, assume that the sipe 1 is carved in the tire width direction. When a longitudinal force is applied to the sipe 1 during braking or the like, the opening 3 of the sipe 1 is closed. Since there is the first wide portion 2a, the opening 3a of the first wide portion is not completely closed, and the edge effect and water removal effect by the sipe 1 are ensured. Even if the wear of the tire progresses and the first wide portion 2a disappears, the second wide portion 2b appears, so that the edge effect and water removal effect by the sipe 1 are similarly secured.

また、幅広部２ａ及び２ｂはトレッド表面Ｔからサイプ底４まで延びていないので、ブロック１０の剛性が低下することがない。その結果、サイプ１に前後力が負荷されてもサイプ１の倒れ込みを抑えられ、接地面積の低下を招くことなく、アイス性能が低下することもない。   Further, since the wide portions 2a and 2b do not extend from the tread surface T to the sipe bottom 4, the rigidity of the block 10 does not decrease. As a result, even if a longitudinal force is applied to the sipe 1, the sipe 1 can be prevented from falling down, the contact area is not reduced, and the ice performance is not lowered.

第１幅広部２ａと第２幅広部２ｂは、サイプ１に関して同じ側にあっても、互いに異なる側にあってもよい。また、図示したように幅広部２ａ、２ｂの長さが深さ方向に一定とするほか、長さが深さ方向に変化する形状としてもよい。例えば、厚さ方向に見た幅広部の形状を図示した長方形とするほか、三角形、逆三角形、台形としてもよい。 The first wide portion 2a and the second wide portion 2b may be on the same side with respect to the sipe 1 or on different sides. Further, as shown in the figure, the lengths of the wide portions 2a and 2b may be constant in the depth direction, or the length may be changed in the depth direction . For example, the shape of the wide portion viewed in the thickness direction may be a rectangular shape as illustrated, or may be a triangle, an inverted triangle, or a trapezoid.

タイヤの摩耗が進行しブロック１０の高さが低くなりブロック１０の剛性が高くなるので、トレッドに開口した第１幅広部２ａのみとしてもよい。新品時から摩耗が進行するまでは、サイプ１が刻まれたブロック１０が高いので剛性が小さいが、上述したようにサイプ１の倒れ込みを抑えられ、接地面積の低下を招くことなくアイス性能が低下するがない。   Since the wear of the tire progresses and the height of the block 10 decreases and the rigidity of the block 10 increases, only the first wide portion 2a opened in the tread may be provided. Since the block 10 with the sipe 1 is high from the beginning of the new product until the wear progresses, the rigidity is small, but as described above, the sipe 1 can be prevented from falling down and the ice performance is reduced without causing a reduction in the contact area. There is nothing to do.

幅広部２ａ、２ｂの厚みは特に限定されないが、例えばサイプ１の厚みは０．３ｍｍ〜０．５ｍｍに対して、幅広部２ａ、２ｂの厚みは０．６ｍｍ〜１．２ｍｍとすることが好ましく、０．６ｍｍ〜０．８ｍｍがより好ましい。また、サイプ１は図示したように両端が開口したオープンサイプのほか、両端が閉塞したクローズドサイプ、片端のみが開口した片オープンサイプでもよい。   The thickness of the wide portions 2a and 2b is not particularly limited. For example, the thickness of the sipe 1 is preferably 0.3 mm to 0.5 mm, and the thickness of the wide portions 2a and 2b is preferably 0.6 mm to 1.2 mm. 0.6 to 0.8 mm is more preferable. Further, the sipe 1 may be an open sipe having both ends opened as shown, a closed sipe having both ends closed, or a single open sipe having only one end opened.

実施例として本発明に係る空気入りラジアルタイヤ及び従来例に係る空気入りラジアルタイヤをそれぞれ試作して性能評価を行った。実施例に係るタイヤは図２（ａ）に示したブロックを備える。従来例１、２に係るタイヤは、それぞれ図２（ｂ）、（ｃ）に示したブロックを備える。サイプの形状及び寸法は表１に示すとおりで、タイヤサイズは１９５／６５Ｒ１５で、２０００ｃｃＦＦセダン型乗用車に装着して性能評価を行った。ある。   As an example, a pneumatic radial tire according to the present invention and a pneumatic radial tire according to a conventional example were prototyped and performance evaluation was performed. The tire according to the example includes the block shown in FIG. The tires according to the conventional examples 1 and 2 include the blocks shown in FIGS. 2B and 2C, respectively. The shape and dimensions of the sipe were as shown in Table 1. The tire size was 195 / 65R15, and the performance was evaluated by mounting it on a 2000 ccFF sedan type passenger car. is there.

表1において、アイス性能は新品時におけるアイス路面上を時速４０ｋｍからのＡＢＳ制動距離の逆数、摩耗性能はドライ路面を８０００ｋｍ走行した後の段差摩耗量の逆数である。いずれも、従来例１を１００とした指数で表し、数字が大きいほど性能が良いことを示す。   In Table 1, the ice performance is the reciprocal of the ABS braking distance from 40 km / h on the ice road surface when new, and the wear performance is the reciprocal of the step wear amount after running 8000 km on the dry road surface. Both are represented by an index with Conventional Example 1 being 100, and the larger the number, the better the performance.

Figure 0004094571
Figure 0004094571

表1によれば、実施例ではサイプに幅広部が設けられいずれの幅広部もトレッド表面からサイプ底まで延びていないので、サイプの倒れ込みが抑えられ従来例２に比べてもアイス性能が向上している。また、タイヤの剛性が低下していないので、幅広部を備えていない従来例１と摩耗性能を確保している。   According to Table 1, in the example, the sipe has a wide portion, and none of the wide portions extend from the tread surface to the sipe bottom, so that the sipe collapse is suppressed and the ice performance is improved compared to the conventional example 2. ing. Further, since the rigidity of the tire is not lowered, the wear performance is ensured as compared with Conventional Example 1 that does not include the wide portion.

以上、サイプをタイヤ幅方向に刻んだ場合について説明したが、サイプをタイヤ周方向や斜め方向に刻んでもよい。タイヤ周方向のサイプの場合、横力に対してサイプの閉塞が抑制され旋回性能が向上する。斜め方向のサイプの場合、前後力及び横力に対してサイプの閉塞が抑制されるので、制動性能及び旋回性能が向上する。   The case where the sipe is cut in the tire width direction has been described above, but the sipe may be cut in a tire circumferential direction or an oblique direction. In the case of a sipe in the tire circumferential direction, blockage of the sipe with respect to lateral force is suppressed, and turning performance is improved. In the case of a sipe in an oblique direction, since the sipe is blocked against the longitudinal force and the lateral force, the braking performance and the turning performance are improved.

（ａ）は本発明に係る空気入りラジアルタイヤのサイプの斜視図、（ｂ）及び（ｃ）は従来例に係る空気入りラジアルタイヤのサイプの斜視図をそれぞれ示す。(A) is a perspective view of the sipe of the pneumatic radial tire which concerns on this invention, (b) and (c) each show the perspective view of the sipe of the pneumatic radial tire which concerns on a prior art example. サイプが刻まれたブロックを示す図で、（ａ）は実施例、（ｂ）は従来例１、（ｃ）は従来例２に係るブロックを示す。It is a figure which shows the block in which the sipe was carved, (a) is an Example, (b) is the prior art example 1, (c) shows the block which concerns on the prior art example 2. FIG.

符号の説明Explanation of symbols

１ サイプ
２ａ 第１幅広部
２ｂ 第２幅広部
３ 開口部
DESCRIPTION OF SYMBOLS 1 Sipe 2a 1st wide part 2b 2nd wide part 3 Opening part

Claims (2)

トレッド表面にサイプが刻まれた空気入りラジアルタイヤにおいて、
前記サイプは厚みが他の部分より厚い第１幅広部を備え、前記第１幅広部は、トレッド表面から深さ方向に延び前記サイプの底部に至る途中で閉塞し、前記第１幅広部の長さは、前記サイプ全体の長さより短い空気入りラジアルタイヤ。 In pneumatic radial tires with sipe carved on the tread surface,
The sipe includes a first wide portion that is thicker than other portions, and the first wide portion extends in a depth direction from the tread surface and closes on the way to the bottom of the sipe, and the length of the first wide portion. This is a pneumatic radial tire shorter than the entire length of the sipe . 前記サイプは更に厚みが他の部分より厚い第２幅広部を備え、前記第２幅広部は、前記第１幅広部の底部と同じ高さ又はトレッド表面側にある位置からサイプ底まで延び、前記第２幅広部の長さは、前記サイプ全体の長さより短く、前記第１幅広部と前記第２幅広部は、サイプ長さ方向において互いに異なる位置にある請求項１に記載の空気入りラジアルタイヤ。 The sipe further includes a second wide portion having a thicker thickness than other portions, and the second wide portion extends from the same height as the bottom of the first wide portion or the tread surface side to the sipe bottom , 2. The pneumatic radial tire according to claim 1 , wherein a length of the second wide portion is shorter than a length of the entire sipe, and the first wide portion and the second wide portion are located at different positions in the sipe length direction. .
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