JP2012020695A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2012020695A
JP2012020695A JP2010161210A JP2010161210A JP2012020695A JP 2012020695 A JP2012020695 A JP 2012020695A JP 2010161210 A JP2010161210 A JP 2010161210A JP 2010161210 A JP2010161210 A JP 2010161210A JP 2012020695 A JP2012020695 A JP 2012020695A
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tread
groove
wall surface
tread groove
pneumatic tire
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JP5569207B2 (en
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Takahiro Yamakawa
貴弘 山川
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of achieving both ice performance and snow performance.SOLUTION: In the pneumatic tire, a tread 10 includes a tread groove 12 and a land 14 divided by the tread groove 12, and a sipe 18 is formed on a tread surface 16 that is the surface of the land 14. Small holes 22 which are recessed by ≥2 mm in a direction perpendicular to an extension surface of the tread surface 16 and by a depth shallower than the tread groove 12 and appear on the tread surface 16 during the wear of the tread 10 are provided in a wall surface 20 of the tread groove 12 dividing the land 14.

Description

本発明は、トレッド部に、トレッド溝と、このトレッド溝により区画された陸部とを備え、前記陸部の表面であるトレッド面にサイプが形成された空気入りタイヤに関する。   The present invention relates to a pneumatic tire that includes a tread groove in a tread portion and a land portion defined by the tread groove, and a sipe is formed on a tread surface that is a surface of the land portion.

従来、冬用タイヤ（スタッドレスタイヤ）は、リブパターンを採用することで接地面積を増加させ、ブロックパターンを採用することでブロックによるエッジ効果を確保し、ブロックやリブのトレッド面にサイプを設けることでサイプによるエッジ効果を確保し、それらにより氷上性能の向上を図っている。
一方、トレッド溝の溝体積を大きくとることで雪中せん断力を確保し、ブロックパターンの採用によりトレッド溝を多く確保し、それらにより雪上性能の向上を図っている。
また、氷上性能や雪上性能を向上させるため、トレッド溝の壁面に微小な小孔を設けたタイヤ（特許文献１）や、トレッド面の特定形状部分に小孔を設けたタイヤ（特許文献２）も提供されている。 Conventionally, winter tires (studless tires) use a rib pattern to increase the contact area, and use a block pattern to secure the edge effect of the block and provide a sipe on the tread surface of the block or rib. The edge effect by sipe is secured, and the performance on ice is improved by them.
On the other hand, by increasing the groove volume of the tread groove, a shearing force in the snow is secured, and by adopting a block pattern, a large number of tread grooves are secured, thereby improving the performance on snow.
Further, in order to improve the performance on ice and the performance on snow, a tire (Patent Document 1) provided with minute holes on the wall surface of the tread groove, and a tire (Patent Document 2) provided with holes provided in a specific shape portion of the tread surface. Is also provided.

特許３９９８５７４号Japanese Patent No. 3998574 特許４３８１８６９号Japanese Patent No. 4381869

しかしながら氷上性能と雪上性能は、溝体積を増加させると雪上性能は向上するが、接地面積が減少するため氷上性能が悪化するといった背反関係にある。
本発明は前記事情に鑑み案出されたものであって、本発明の目的は、氷上性能と雪上性能の両立を可能とした空気入りタイヤを提供することにある。 However, the performance on ice and the performance on snow are in a trade-off relationship that the performance on snow improves when the groove volume is increased, but the performance on ice deteriorates because the contact area decreases.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a pneumatic tire that can achieve both performance on ice and performance on snow.

前記目的を達成するため、本発明は、レッド部に、トレッド溝と、このトレッド溝により区画された陸部とを備え、前記陸部の表面であるトレッド面にサイプが形成された空気入りタイヤにおいて、前記トレッド溝の壁面に、前記トレッド面の延長面に対して直交する方向に２ｍｍ以上かつ前記トレッド溝よりも浅い深さで窪みトレッド部の摩耗によりトレッド面に出現する小孔が設けられていることを特徴とする。   In order to achieve the above object, the present invention provides a pneumatic tire comprising a tread groove in a red portion and a land portion partitioned by the tread groove, and a sipe formed on a tread surface which is a surface of the land portion. The tread groove has a small hole that appears in the tread surface due to wear of the recessed tread portion at a depth of 2 mm or more in a direction orthogonal to the extension surface of the tread surface and shallower than the tread groove. It is characterized by.

小孔をトレッド溝の壁面に設けると、雪を掻き込む際のトレッド溝の体積が増加するので、雪中せん断力を増加させ、雪上性能を向上することが可能となる。
また、トレッド面の面積を減少させることがないので、接地面積を確保し、かつ、サイプによるエッジ効果により氷上性能を向上する上で有利となる。
さらに、トレッド部の摩耗時において、小孔がトレッド面に出現するので、サイプに加え小孔によってもエッジ効果と除水機能が発揮され、タイヤ新品時から摩耗後まで氷上性能を向上する上で有利となる。 When the small hole is provided in the wall surface of the tread groove, the volume of the tread groove when the snow is scraped increases, so that the shear force in snow can be increased and the performance on snow can be improved.
Further, since the area of the tread surface is not reduced, it is advantageous in securing a ground contact area and improving the performance on ice by the edge effect by sipe.
In addition, a small hole appears on the tread surface when the tread is worn, so the edge effect and water removal function are exhibited by the small hole in addition to the sipe. It will be advantageous.

トレッドパターンの説明図である。It is explanatory drawing of a tread pattern. 小孔が形成されたトレッド溝の壁面の説明図で、（Ａ）は壁面の斜視図、（Ｂ）は（Ａ）のＢＢ断面図、（Ｃ）はトレッド部の摩耗後の壁面の斜視図、（Ｄ）は（Ｂ）のＤＤ断面図である。It is explanatory drawing of the wall surface of the tread groove in which the small hole was formed, (A) is a perspective view of a wall surface, (B) is BB sectional drawing of (A), (C) is a perspective view of the wall surface after abrasion of a tread part. (D) is DD sectional drawing of (B). 小孔が形成されたトレッド溝の壁面の断面図である。It is sectional drawing of the wall surface of the tread groove in which the small hole was formed. 底面に対する角度がトレッド溝の延在方向に沿って変化している壁面の斜視図である。It is a perspective view of the wall surface in which the angle with respect to a bottom face is changing along the extension direction of a tread groove. （Ａ）はセンターリブの拡大図、（Ｂ）はセンターリブを区画するトレッド溝の壁面の斜視図である。(A) is an enlarged view of a center rib, (B) is a perspective view of the wall surface of the tread groove which divides the center rib. 雪上操縦安定性、タイヤ新品時の氷上制動性、４０％摩耗後の氷上制動性についての試験結果を示す図である。It is a figure which shows the test result about snow handling stability, the braking performance on ice when a tire is new, and the braking performance on ice after 40% wear.

図１に示すように、スタッドレスタイヤのトレッド部１０に、トレッド溝１２と、このトレッド溝１２により区画された陸部１４が設けられている。
より詳細に説明すると、トレッド溝１２は、タイヤ周方向に延在する複数の縦溝１２Ａと、タイヤ幅方向に延在する横溝１２Ｂとを含んで構成されている。
本実施の形態では、縦溝１２Ａは、タイヤ赤道の両側に位置する一対の第１縦溝１２Ａー１、一対の第１縦溝１２Ａー１の両側に位置する一対の第２縦溝１２Ａー２、第１縦溝１２Ａー１と第２の溝１２Ａー１の間に位置する細幅な第３縦溝１２Ａー３を含んで構成されている。
また、横溝１２Ｂはトレッド部１０のショルダー部から第１縦溝１２Ａー１に接続する第１横溝１２Ｂー１と、トレッド部１０のショルダー部から第３縦溝１２Ａー３に連通する第２横溝１２Ｂー２を含んで構成されている。 As shown in FIG. 1, a tread portion 10 of a studless tire is provided with a tread groove 12 and a land portion 14 partitioned by the tread groove 12.
More specifically, the tread groove 12 includes a plurality of vertical grooves 12A extending in the tire circumferential direction and lateral grooves 12B extending in the tire width direction.
In the present embodiment, the longitudinal grooves 12A include a pair of first longitudinal grooves 12A-1 located on both sides of the tire equator and a pair of second longitudinal grooves 12A located on both sides of the pair of first longitudinal grooves 12A-1. 2. A narrow third vertical groove 12A-3 located between the first vertical groove 12A-1 and the second groove 12A-1 is included.
The lateral groove 12B includes a first lateral groove 12B-1 connected from the shoulder portion of the tread portion 10 to the first longitudinal groove 12A-1, and a second lateral groove communicated from the shoulder portion of the tread portion 10 to the third longitudinal groove 12A-3. 12B-2 is included.

陸部１４は、タイヤ周方向に延在するリブ１４Ａのみで、または、ブロック１４Ｂがタイヤ周方向に並べられたブロック列１４Ｃのみで、または、それらリブ１４Ａとブロック列１４Ｃを含んで構成されている。
本実施の形態では、陸部１４は、センターリブ１４Ａと、第１ブロック列１４Ｃー１と、第２ブロック列１４Ｃー２と、第３ブロック列１４Ｃー３とで構成されている。
センターリブ１４Ａは、一対の第１縦溝１２Ａー１により区画されタイヤ周方向に延在している。第１ブロック列１４Ｃー１は、第１縦溝１２Ａー１と第３縦溝１２Ａー３と第１横溝１２Ｂー１で区画された第１ブロック１４Ｂー１が周方向に並べられて構成されている。第２ブロック列１４Ｃー２は、第３縦溝１２Ａー３と第２縦溝１２Ａー２と第１横溝１２Ｂー１と第２横溝１２Ｂー２で区画された第２ブロック１４Ｂー２がタイヤ周方向に並べられて構成されている。第３ブロック列１４Ｃー３は、第２縦溝１２Ａー２と第１横溝１２Ｂー１と第２横溝１２Ｂー２で区画された第３ブロック１４Ｂー３がタイヤ周方向に並べられて構成されている。 The land portion 14 is configured with only the ribs 14A extending in the tire circumferential direction, or only with the block rows 14C in which the blocks 14B are arranged in the tire circumferential direction, or including the ribs 14A and the block rows 14C. Yes.
In the present embodiment, the land portion 14 includes a center rib 14A, a first block row 14C-1, a second block row 14C-2, and a third block row 14C-3.
The center rib 14A is partitioned by the pair of first vertical grooves 12A-1 and extends in the tire circumferential direction. The first block row 14C-1 is configured by arranging the first blocks 14B-1 partitioned by the first vertical grooves 12A-1, the third vertical grooves 12A-3, and the first horizontal grooves 12B-1 in the circumferential direction. ing. In the second block row 14C-2, the second block 14B-2 defined by the third vertical groove 12A-3, the second vertical groove 12A-2, the first horizontal groove 12B-1, and the second horizontal groove 12B-2 is a tire. They are arranged in the circumferential direction. The third block row 14C-3 is configured by arranging the third blocks 14B-3 partitioned by the second vertical grooves 12A-2, the first horizontal grooves 12B-1, and the second horizontal grooves 12B-2 in the tire circumferential direction. ing.

また、陸部１４の表面であるトレッド面１６の少なくとも一部にサイプ１８が形成され、または、サイプ１８と小孔（不図示）が形成されている。本実施の形態では、陸部１４のトレッド面１６の全域に、すなわち、センターリブ１４Ａのトレッド面１６とブロック１４Ｂのトレッド面１６の全域にサイプ１８が形成されている。   Moreover, the sipe 18 is formed in at least one part of the tread surface 16 which is the surface of the land part 14, or the sipe 18 and a small hole (not shown) are formed. In the present embodiment, sipes 18 are formed over the entire tread surface 16 of the land portion 14, that is, over the entire tread surface 16 of the center rib 14A and the tread surface 16 of the block 14B.

図２に示すように、陸部１４を区画するトレッド溝１２の壁面２０に、トレッド部１０の摩耗によりトレッド面１６に出現する小孔２２が設けられている。
本実施の形態では、小孔２２は、センターリブ１４Ａを区画する両側の第１の縦溝１２Ａの壁面２０に設けられている。また小孔２２は、第１ブロック１４Ｂー１を区画する第１縦溝１２Ａー１の壁面２０、第１横溝１２Ｂー１の壁面２０に設けられている。また、小孔２２は、第２ブロック１４Ｂー２を区画する第２縦溝１２Ａー２の壁面２０、第１横溝１２Ｂー１の壁面２０、第２横溝１２Ｂー２の壁面２０に設けられている。また小孔２２は、第３ブロック１４Ｂー３を区画する第２縦溝１２Ａー２の壁面２０、第１横溝１２Ｂー１の壁面２０、第２横溝１２Ｂー２の壁面２０に設けられている。 As shown in FIG. 2, a small hole 22 that appears in the tread surface 16 due to wear of the tread portion 10 is provided in the wall surface 20 of the tread groove 12 that partitions the land portion 14.
In the present embodiment, the small holes 22 are provided in the wall surfaces 20 of the first vertical grooves 12A on both sides that define the center rib 14A. The small holes 22 are provided in the wall surface 20 of the first vertical groove 12A-1 and the wall surface 20 of the first horizontal groove 12B-1 that define the first block 14B-1. The small holes 22 are provided in the wall surface 20 of the second vertical groove 12A-2, the wall surface 20 of the first horizontal groove 12B-1, and the wall surface 20 of the second horizontal groove 12B-2 that define the second block 14B-2. Yes. The small holes 22 are provided in the wall surface 20 of the second vertical groove 12A-2, the wall surface 20 of the first horizontal groove 12B-1, and the wall surface 20 of the second horizontal groove 12B-2 that define the third block 14B-3. .

より詳細に説明すると、トレッド溝１２は底面２４と、この底面２４の両側から起立する壁面２０とで構成され、小孔２２は、陸部１４を区画するトレッド溝１２の壁面２０に設けられている。   More specifically, the tread groove 12 is composed of a bottom surface 24 and wall surfaces 20 rising from both sides of the bottom surface 24, and the small holes 22 are provided on the wall surface 20 of the tread groove 12 that partitions the land portion 14. Yes.

このような小孔２２をトレッド溝１２の壁面２０に設けると、雪を掻き込む際のトレッド溝１２の体積が小孔２２により増加するので、雪中せん断力を増加させ、雪上性能を向上することが可能となる。
また、トレッド溝１２の体積の増加は小孔２２によりなされ、トレッド面１６の面積を減少させることがないので、接地面積を確保し、かつ、サイプ１８によるエッジ効果により氷上性能を向上する上で有利となる。
さらに、トレッド部１０の摩耗時において、図２（Ｃ）、（Ｄ）に示すように、小孔２２がトレッド面１６に出現するので、サイプ１８に加え小孔２２によってもエッジ効果と除水機能が発揮され、タイヤ新品時から摩耗後まで氷上性能を確保する上で有利となる。
この場合、小孔２２は、雪上性能の向上が図れ、トレッド部１０の摩耗時においてトレッド面１６に出現してエッジ効果や除水機能が発揮される観点からすると、図２（Ｂ）に示すように、トレッド面１６の延長面１６Ａに対して直交する方向に窪み、深さＤが２．０ｍｍ以上必要であり、また、陸部１４の剛性を確保する観点から、トレッド溝１２の底面２４よりも浅いことが必要である。 When such a small hole 22 is provided in the wall surface 20 of the tread groove 12, the volume of the tread groove 12 when the snow is scraped increases by the small hole 22, thereby increasing the shear force in snow and improving the performance on snow. It becomes possible.
Further, since the volume of the tread groove 12 is increased by the small holes 22 and the area of the tread surface 16 is not reduced, the ground contact area is secured and the on-ice performance is improved by the edge effect by the sipe 18. It will be advantageous.
Further, when the tread portion 10 is worn, the small holes 22 appear on the tread surface 16 as shown in FIGS. 2C and 2D, so that the edge effect and water removal are also achieved by the small holes 22 in addition to the sipe 18. The function is demonstrated, and it is advantageous in securing on-ice performance from when a tire is new to after wear.
In this case, the small hole 22 can improve the performance on the snow, and is shown in FIG. 2B from the viewpoint of appearing on the tread surface 16 when the tread portion 10 is worn and exhibiting the edge effect and the water removal function. As described above, the bottom surface 24 of the tread groove 12 is recessed from a direction orthogonal to the extended surface 16A of the tread surface 16 and a depth D of 2.0 mm or more is required, and the rigidity of the land portion 14 is ensured. It is necessary to be shallower.

また、陸部１４の剛性を確保しつつ、雪中せん断力を十分に発揮させる観点からすると、小孔２２の断面積は、０．２〜１０ｍｍ２の範囲内にあることが好ましい。
また、小孔２２の断面形状は、円形や多角形など任意であるが、円形にすると、前後左右の陸部１４の剛性変化が最小限に抑えられ、操縦安定性や耐摩耗性能を確保しつつ氷雪性能を向上させる上で有利となる。
また、陸部１４の剛性を確保する観点から、小孔２２が設けられる壁面２０は、図３に示すように、トレッド溝１２の底面２４の法線Ｌ１に対して１０度以上の角度θ１を持って傾斜しており、かつ底面２４に対して直交する方向から見て、壁面２０と底面２４とが交わる箇所から壁面２０とトレッド面１６とが交わる箇所までの長さである壁面２０の幅Ｗが２．０ｍｍ以上であることが好ましい。
また、小孔２２の深さの方向は、タイヤ加硫後の金型からの抜けや、雪の排出性能を考慮すると、トレッド面１６の延長面１６Ａの法線Ｌ２に対しての角度θ２が±１０°の範囲であることが好ましい。 Further, from the viewpoint of sufficiently exerting the shearing force in snow while securing the rigidity of the land portion 14, the cross-sectional area of the small hole 22 is preferably in the range of 0.2 to 10 mm 2 .
In addition, the cross-sectional shape of the small hole 22 is arbitrary, such as a circle or a polygon, but if it is a circle, the change in rigidity of the land portion 14 on the front, rear, left and right is minimized, ensuring steering stability and wear resistance. However, it is advantageous in improving the snow and ice performance.
Further, from the viewpoint of securing the rigidity of the land portion 14, the wall surface 20 provided with the small holes 22 has an angle θ1 of 10 degrees or more with respect to the normal L1 of the bottom surface 24 of the tread groove 12, as shown in FIG. The width of the wall surface 20 that is the length from the location where the wall surface 20 and the bottom surface 24 intersect to the location where the wall surface 20 and the tread surface 16 intersect when viewed from the direction orthogonal to the bottom surface 24. W is preferably 2.0 mm or more.
The direction of the depth of the small hole 22 is determined so that the angle θ2 with respect to the normal line L2 of the extended surface 16A of the tread surface 16 is determined in consideration of the escape from the mold after tire vulcanization and the snow discharge performance. A range of ± 10 ° is preferable.

また、トレッド溝１２の壁面２０のトレッド溝１２の底面２４に対する角度θ３が変化している場合、例えば、壁面２０のトレッド溝１２の底面２４に対する角度θ３が、図４に示すように、トレッド溝１２の延在方向に沿って変化している場合、または、角度θ３が底面２４からトレッド面１６に向かう方向に沿って変化している場合、壁面２０における小孔２２の密度を、角度θ３の増加に伴い高く形成することも可能である。
壁面２０の角度θ３を滑らかに変化させると、陸部１４の不連続な剛性変化が無く、操縦安定性、耐摩耗性を向上する上で有利となるが、この場合、壁面２０の角度θ３が大きくなるほど、陸部１４の剛性が高くなるため、小孔２２の密度を高く形成することが可能となり、このような密度で小孔２２を設けると、雪上性能を向上する上で有利となる。なお、小孔２２の密度の調整は、壁面２０の単位面積当たりの小孔２２の個数を変えることで、あるいは、小孔２２の断面積を変えることでなされる。 Further, when the angle θ3 of the wall surface 20 of the tread groove 12 with respect to the bottom surface 24 of the tread groove 12 changes, for example, the angle θ3 of the wall surface 20 with respect to the bottom surface 24 of the tread groove 12 changes as shown in FIG. 12, or when the angle θ 3 changes along the direction from the bottom surface 24 toward the tread surface 16, the density of the small holes 22 in the wall surface 20 is changed to the angle θ 3. It is possible to increase the height as the number increases.
If the angle θ3 of the wall surface 20 is smoothly changed, there is no discontinuous rigidity change of the land portion 14, which is advantageous in improving the steering stability and wear resistance. In this case, the angle θ3 of the wall surface 20 is The larger the size, the higher the rigidity of the land portion 14, so that the density of the small holes 22 can be increased. Providing the small holes 22 at such a density is advantageous in improving the performance on snow. The density of the small holes 22 is adjusted by changing the number of small holes 22 per unit area of the wall surface 20 or by changing the cross-sectional area of the small holes 22.

例えば、図５（Ａ）に拡大図で示すように、センターリブ１４Ａの両側にはそれぞれエッジ効果により氷上性能を向上させるための切り欠き２４がタイヤ周方向に間隔をおいて設けられている。そして、この各切り欠き２４の箇所においてトレッド溝１２の壁面２０の、トレッド溝１２の底面２４に対する角度θ３（図３参照）がトレッド溝１２の延在方向に沿って変化する３次元形状の壁面２０となっている。したがって、センターリブ１４Ａの両側には、この３次元形状の壁面２０がトレッド溝１２の延在方向に複数並べられて構成されていることになる。
このような場合、図５（Ｂ）に示すように、３次元形状の壁面２０に設ける小孔２２の密度を、角度θ３の増加に伴い高く形成すると、雪上性能を向上する上で有利となる。 For example, as shown in an enlarged view in FIG. 5A, notches 24 are provided on both sides of the center rib 14A at intervals in the tire circumferential direction for improving the performance on ice by the edge effect. A three-dimensional wall surface in which the angle θ3 (see FIG. 3) of the wall surface 20 of the tread groove 12 with respect to the bottom surface 24 of the tread groove 12 changes along the extending direction of the tread groove 12 at each notch 24. It is 20. Therefore, a plurality of the three-dimensional wall surfaces 20 are arranged in the extending direction of the tread groove 12 on both sides of the center rib 14A.
In such a case, as shown in FIG. 5B, if the density of the small holes 22 provided in the three-dimensional wall surface 20 is increased as the angle θ3 increases, it is advantageous in improving the performance on snow. .

タイヤサイズ２２５／６５Ｒ１７で図１および下記に示すトレッドパターンを有する試験タイヤを排気量２０００ｃｃのＲＶ車に取り付け、小孔がトレッド溝の壁面に形成されていない従来例と、図６に示す小孔がトレッド溝の壁面に形成された実施例１〜５とについて、タイヤ新品時の雪上操縦安定性、タイヤ新品時の氷上制動性、４０％摩耗後の氷上制動性について試験を行なった。
リム：１７×７ＪＪ
荷重条件：４．５ｋＮ
試験空気圧：２３０ｋＰａ
雪上操縦安定性、氷上制動性の評価は、テストドライバーによる官能評価で行い、５回の測定で最大値と最小値を除いた中間の３回の値の平均値を算出し、それぞれ従来品を１００とする指数により表示し、数値が大きいほど雪上操縦安定性、氷上制動性に優れることを示す。 A test tire having a tread pattern shown in FIG. 1 and the tire size 225 / 65R17 is attached to an RV vehicle having a displacement of 2000 cc and a small hole is not formed in the wall surface of the tread groove, and the small hole shown in FIG. For Examples 1 to 5 formed on the wall surface of the tread groove, tests were conducted on snow handling stability when the tire was new, ice braking when the tire was new, and ice braking after 40% wear.
Rim: 17 × 7JJ
Load condition: 4.5kN
Test air pressure: 230kPa
Steering stability on snow and braking performance on ice are evaluated by sensory evaluation by a test driver, and the average value of three intermediate values excluding the maximum and minimum values is calculated by five measurements. The index is set to 100, and the larger the value, the better the snow handling stability and ice braking performance.

（従来例と実施例１〜５）
第１ブロック１４Ｂー１を区画する第１縦溝１２Ａー１の壁面２０の角度θ１＝１０°、壁面２０の幅W＝２mm
第１ブロック１４Ｂー１を区画する第１横溝１２Ｂー１の壁面２０の角度θ１＝１０°、壁面２０の幅W＝２mm
第２ブロック１４Ｂー２を区画する第２縦溝１２Ａー２の壁面２０の角度θ１＝８°、壁面２０の幅W＝２．２mm
第２ブロック１４Ｂー２を区画する第１横溝１２Ｂー１の壁面２０の角度θ１＝１０°、壁面２０の幅W＝２mm
第２ブロック１４Ｂー２を区画する第２横溝１２Ｂー２の壁面２０の角度θ１＝１０°、壁面２０の幅W＝２mm
第３ブロック１４Ｂー３を区画する第２縦溝１２Ａー２の壁面２０の角度θ１＝８°、壁面２０の幅W＝２．２mm
第３ブロック１４Ｂー３を区画する第１横溝１２Ｂー１の壁面２０の角度θ１＝１０°、壁面２０の幅W＝２mm
第３ブロック１４Ｂー３を区画する第２横溝１２Ｂー２の壁面２０の角度θ１＝１０°、壁面２０の幅W＝２mm
実施例１〜６では上記の壁面２０に小孔２２が形成されている。 (Conventional example and Examples 1 to 5)
The angle θ1 = 10 ° of the wall surface 20 of the first vertical groove 12A-1 that defines the first block 14B-1 and the width W = 2 mm of the wall surface 20
The angle θ1 = 10 ° of the wall surface 20 of the first transverse groove 12B-1 that defines the first block 14B-1 and the width W = 2 mm of the wall surface 20
The angle θ1 = 8 ° of the wall surface 20 of the second vertical groove 12A-2 that defines the second block 14B-2, and the width W of the wall surface 20 = 2.2 mm.
The angle θ1 = 10 ° of the wall surface 20 of the first lateral groove 12B-1 that defines the second block 14B-2, and the width W = 2 mm of the wall surface 20
The angle θ1 = 10 ° of the wall surface 20 of the second transverse groove 12B-2 that defines the second block 14B-2, and the width W = 2 mm of the wall surface 20
The angle θ1 = 8 ° of the wall surface 20 of the second vertical groove 12A-2 that defines the third block 14B-3, and the width W of the wall surface 20 = 2.2 mm.
The angle θ1 = 10 ° of the wall surface 20 of the first transverse groove 12B-1 partitioning the third block 14B-3, and the width W = 2 mm of the wall surface 20
The angle θ1 = 10 ° of the wall surface 20 of the second transverse groove 12B-2 that defines the third block 14B-3, and the width W = 2 mm of the wall surface 20
In the first to sixth embodiments, the small hole 22 is formed in the wall surface 20.

（従来例と実施例１〜４）
従来例と実施例１〜４のセンターリブ１４の両側には切り欠き２４が形成されておらず、直線状に延在している。
センターリブ１４Ａを区画する両側の第１の縦溝１２Ａの壁面２０の角度θ１：１０°、壁面２０の幅W＝２mm
実施例１〜５では上記の壁面２０に小孔２２が形成されている。
（実施例５）
センターリブ１４の両側には図５に示すように切り欠き２４が形成され、センターリブ１４Ａを区画する両側の第１の縦溝１２Ａの壁面２０角度θ１は１０°〜１２°に変化、壁面２０の幅Wが２mmから４mmに変化
実施例５では上記の壁面２０に小孔２２が形成され、小孔２２の密度は角度θ３の増加に伴い高く形成されている。 (Conventional example and Examples 1-4)
Notches 24 are not formed on both sides of the center rib 14 of the conventional example and Examples 1 to 4, but extend linearly.
The angle θ1: 10 ° of the wall surface 20 of the first vertical groove 12A on both sides that divides the center rib 14A, and the width W of the wall surface 20 = 2 mm.
In the first to fifth embodiments, the small hole 22 is formed in the wall surface 20.
(Example 5)
As shown in FIG. 5, notches 24 are formed on both sides of the center rib 14, and the wall surface 20 angle θ1 of the first vertical grooves 12A on both sides that define the center rib 14A changes from 10 ° to 12 °. In Example 5, small holes 22 are formed in the wall surface 20, and the density of the small holes 22 is increased as the angle θ3 increases.

図６から実施例１〜５によれば、氷上性能を確保しつつ雪上性能を向上できることが明らかであり、また、４０％摩耗後の氷上制動性を向上できることが明らかである。   According to Examples 1 to 5 from FIG. 6, it is clear that the performance on snow can be improved while ensuring the performance on ice, and that the braking performance on ice after 40% wear can be improved.

１０……トレッド部、１２……トレッド溝、１２Ａ……縦溝、１２Ｂ……横溝、１４……陸部、１４Ａ……リブ、１４Ｂ……ブロック、１４Ｃ……ブロック列、１８……サイプ、２０……壁面、２２……小孔。   10 ... Tread part, 12 ... Tread groove, 12A ... Vertical groove, 12B ... Horizontal groove, 14 ... Land part, 14A ... Rib, 14B ... Block, 14C ... Block row, 18 ... Sipe, 20 ... wall, 22 ... small hole.

Claims (7)

トレッド部に、トレッド溝と、このトレッド溝により区画された陸部とを備え、前記陸部の表面であるトレッド面にサイプが形成された空気入りタイヤにおいて、
前記トレッド溝の壁面に、前記トレッド面の延長面に対して直交する方向に２ｍｍ以上かつ前記トレッド溝よりも浅い深さで窪みトレッド部の摩耗によりトレッド面に出現する小孔が設けられている、
空気入りタイヤ。 In the pneumatic tire in which a tread portion includes a tread groove and a land portion partitioned by the tread groove, and a sipe is formed on a tread surface which is a surface of the land portion.
On the wall surface of the tread groove, there is provided a small hole that appears in the tread surface due to wear of the recessed tread part at a depth of 2 mm or more in a direction orthogonal to the extended surface of the tread surface and shallower than the tread groove. ,
Pneumatic tire. 前記小孔の断面積は、０．２〜１０ｍｍ２の範囲内である、
請求項１または２記載の空気入りタイヤ。 The cross-sectional area of the small hole is within a range of 0.2 to 10 mm 2 .
The pneumatic tire according to claim 1 or 2. 前記小孔が設けられる壁面は、前記トレッド溝の底面の法線に対して１０度以上の角度を持って傾斜しており、かつ前記底面に対して直交する方向から見て、前記壁面と前記底面とが交わる箇所から前記壁面と前記トレッド面とが交わる箇所までの長さである前記壁面の幅が２．０ｍｍ以上である、
請求項１または２記載の空気入りタイヤ。 The wall surface on which the small hole is provided is inclined with an angle of 10 degrees or more with respect to the normal line of the bottom surface of the tread groove, and when viewed from a direction orthogonal to the bottom surface, The width of the wall surface, which is the length from the location where the bottom surface intersects to the location where the wall surface and the tread surface intersect, is 2.0 mm or more,
The pneumatic tire according to claim 1 or 2. 前記小孔の断面積は、円形を呈している、
請求項１乃至３に何れか１項記載の空気入りタイヤ。 The cross-sectional area of the small hole is circular,
The pneumatic tire according to any one of claims 1 to 3. 前記小孔の深さの方向は、トレッド面１６の延長面１６Ａの法線に対しての角度が±１０°の範囲である、
請求項１乃至４に何れか１項記載の空気入りタイヤ。 The direction of the depth of the small hole is such that an angle with respect to the normal line of the extended surface 16A of the tread surface 16 is ± 10 °.
The pneumatic tire according to any one of claims 1 to 4. 前記トレッド溝の壁面の前記トレッド溝の底面に対する角度は前記トレッド溝の延在方向に沿って、または、前記底面からトレッド面に向かう方向に沿って変化しており、
前記壁面における前記小孔の密度は、前記角度の増加に伴い高く形成されている、
請求項１乃至５に何れか１項記載の空気入りタイヤ。 The angle of the wall surface of the tread groove with respect to the bottom surface of the tread groove changes along the extending direction of the tread groove, or along the direction from the bottom surface toward the tread surface,
The density of the small holes in the wall surface is formed higher as the angle increases,
The pneumatic tire according to any one of claims 1 to 5. 前記陸部は、タイヤ幅方向に間隔をおきタイヤ周方向に延在する２つのトレッド溝で挟まれたタイヤ周方向に延在するリブを含んで構成され、
前記陸部に繋がる各トレッド溝の壁面は、トレッド溝の底面に対する角度がトレッド溝の延在方向に沿って変化する３次元形状の壁面が、トレッド溝の延在方向に複数並べられて構成され、
前記３次元形状の壁面における前記小孔の密度は、前記角度の増加に伴い高く形成されている、
請求項１乃至５に何れか１項記載の空気入りタイヤ。 The land portion includes a rib extending in the tire circumferential direction sandwiched between two tread grooves extending in the tire circumferential direction at intervals in the tire width direction,
The wall surface of each tread groove connected to the land portion is formed by arranging a plurality of three-dimensional wall surfaces whose angle with respect to the bottom surface of the tread groove changes along the extending direction of the tread groove in the extending direction of the tread groove. ,
The density of the small holes in the three-dimensional shape wall surface is formed to be higher as the angle increases,
The pneumatic tire according to any one of claims 1 to 5.
JP2010161210A 2010-07-16 2010-07-16 Pneumatic tire Expired - Fee Related JP5569207B2 (en)

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Cited By (5)

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WO2013114490A1 (en) 2012-02-02 2013-08-08 日本電気株式会社 Controller, load-balancing method, non-temporary computer-readable medium for storing program, computer system, and control device
WO2016152627A1 (en) * 2015-03-24 2016-09-29 コンパニー ゼネラール デ エタブリッスマン ミシュラン Tire tread and tire having tread
JP2017165406A (en) * 2013-05-13 2017-09-21 住友ゴム工業株式会社 Pneumatic tire
JP2019218056A (en) * 2019-08-30 2019-12-26 Ｔｏｙｏ Ｔｉｒｅ株式会社 Pneumatic tire
KR102340781B1 (en) * 2020-09-09 2021-12-17 넥센타이어 주식회사 A Tire which has an improved snow grip ability

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JP2008056057A (en) * 2006-08-30 2008-03-13 Bridgestone Corp Pneumatic tire
JP2008195101A (en) * 2007-02-08 2008-08-28 Toyo Tire & Rubber Co Ltd Pneumatic tire
EP2253485A1 (en) * 2009-05-20 2010-11-24 Continental Reifen Deutschland GmbH Run strip profile of a vehicle tyre

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013114490A1 (en) 2012-02-02 2013-08-08 日本電気株式会社 Controller, load-balancing method, non-temporary computer-readable medium for storing program, computer system, and control device
JP2017165406A (en) * 2013-05-13 2017-09-21 住友ゴム工業株式会社 Pneumatic tire
WO2016152627A1 (en) * 2015-03-24 2016-09-29 コンパニー ゼネラール デ エタブリッスマン ミシュラン Tire tread and tire having tread
CN107405958A (en) * 2015-03-24 2017-11-28 米其林企业总公司 Tire tread and the tire with tyre surface
JP2019218056A (en) * 2019-08-30 2019-12-26 Ｔｏｙｏ Ｔｉｒｅ株式会社 Pneumatic tire
KR102340781B1 (en) * 2020-09-09 2021-12-17 넥센타이어 주식회사 A Tire which has an improved snow grip ability

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