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JP2013035345A - Tire - Google Patents

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JP2013035345A
JP2013035345A JP2011171173A JP2011171173A JP2013035345A JP 2013035345 A JP2013035345 A JP 2013035345A JP 2011171173 A JP2011171173 A JP 2011171173A JP 2011171173 A JP2011171173 A JP 2011171173A JP 2013035345 A JP2013035345 A JP 2013035345A
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narrow groove
groove portion
tire
side wall
circumferential
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JP5829859B2 (en
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Koyo Kiwaki
幸洋 木脇
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Bridgestone Corp
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Bridgestone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a tire capable of suppressing uneven wear of a circumferential land portion while inhibiting biting from being caused by a small stone and the like.SOLUTION: A width-direction narrow groove 100 elongated along a tread width direction is formed on a circumferential land portion 20 of the pneumatic tire 10. The width-direction narrow groove 100 includes a first narrow groove portion 110, and a second narrow groove portion 120 communicating with the first narrow groove portion 110. One side wall of the first narrow groove portion 110 is inclined in such a manner that the groove depth of the first narrow groove portion 110 becomes shallower as it gets further away from the other side wall of the first narrow groove portion 110 along the circumferential direction of the tire. A side wall, which is one side wall of the second narrow groove portion 120 and which is formed on the opposite side of the one side wall of the first narrow groove portion 110, is inclined in such a manner that the groove depth of the second narrow groove portion 120 becomes shallower as it gets further away from the other side wall of the second narrow groove portion 120 along the circumferential direction of the tire.

Description

本発明は、タイヤ周方向に沿って延びる周方向陸部を備えるタイヤに関し、特に、周方向陸部の偏摩耗を抑制したタイヤに関する。   The present invention relates to a tire including a circumferential land portion extending along the tire circumferential direction, and more particularly to a tire in which uneven wear of the circumferential land portion is suppressed.

従来、自動車などの車両に装着される空気入りタイヤ（以下、タイヤ）では、偏摩耗の抑制を考慮した様々なトレッドパターンが用いられている。   Conventionally, in a pneumatic tire (hereinafter referred to as a tire) that is mounted on a vehicle such as an automobile, various tread patterns are used in consideration of suppression of uneven wear.

例えば、陸部ブロックの偏摩耗を抑制するため、陸部の高さが角部に向けて減少する面取り部が形成されるとともに、当該面取り部における陸部高さが所定の数式を満足するように徐々に減少したタイヤが知られている（例えば、特許文献１）。   For example, in order to suppress uneven wear of the land block, a chamfered portion in which the height of the land portion decreases toward the corner portion is formed, and the land height in the chamfered portion satisfies a predetermined formula. A tire that gradually decreases is known (for example, Patent Document 1).

このようなタイヤによれば、陸部ブロックの角部の接地圧が適度に低下するため、陸部ブロックの偏摩耗（ヒール・アンド・トゥ摩耗）が抑制される。   According to such a tire, the ground contact pressure at the corners of the land block is appropriately reduced, so that uneven wear (heel and toe wear) of the land block is suppressed.

特開２００６−９６０６２号公報（第３図）Japanese Patent Laying-Open No. 2006-96062 (FIG. 3)

しかしながら、上述した従来のタイヤには、次のような問題があった。すなわち、一般的な乗用自動車よりも高い荷重がタイヤに掛かる、いわゆるSport Utility Vehicle（SUV）向けのタイヤでは、特に、トレッド幅方向におけるセンター領域における偏摩耗（強制摩耗）が激しい問題がある。   However, the conventional tire described above has the following problems. In other words, tires for so-called Sport Utility Vehicles (SUVs), in which a higher load is applied to the tires than general passenger cars, are particularly problematic in uneven wear (forced wear) in the center region in the tread width direction.

このようなセンター領域における偏摩耗を抑制するためには、センター領域に設けられ、タイヤ周方向に延びる周方向陸部に、トレッド幅方向に延びる細溝を適当な間隔で形成することが考えられる。しかしながら、このような細溝を形成すると、当該細溝に小石など噛み込み易くなる別の問題を引き起こす。   In order to suppress such uneven wear in the center region, it is conceivable to form narrow grooves extending in the tread width direction at appropriate intervals in the circumferential land portion provided in the center region and extending in the tire circumferential direction. . However, when such a narrow groove is formed, another problem that makes it easy to bite pebbles or the like into the narrow groove is caused.

そこで、本発明は、このような状況に鑑みてなされたものであり、小石など噛み込みを抑制しつつ、周方向陸部の偏摩耗を抑制し得るタイヤの提供を目的とする。   Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a tire that can suppress uneven wear of a circumferential land portion while suppressing biting of pebbles and the like.

本発明の特徴は、路面に接地し、タイヤ周方向（タイヤ周方向DC）に沿って延びる周方向陸部（周方向陸部20）を備えるタイヤ（空気入りタイヤ10）であって、前記周方向陸部には、トレッド幅方向（トレッド幅方向DT）に沿って延びる幅方向細溝（幅方向細溝100）が形成され、前記幅方向細溝は、第１細溝部（第１細溝部110）と、前記第１細溝部に連通する第２細溝部（第２細溝部120）とを含み、前記第１細溝部の一方の側壁（側壁111）は、前記第１細溝部の溝深さがタイヤ周方向に沿って前記第１細溝部の他方の側壁（側壁112）から遠ざかるに連れて浅くなるように傾斜し、前記第２細溝部の一方の側壁であって、前記第１細溝部の一方の側壁とは逆側に形成される側壁（側壁121）は、前記第２細溝部の溝深さがタイヤ周方向に沿って前記第２細溝部の他方の側壁（側壁122）から遠ざかるに連れて浅くなるように傾斜することを要旨とする。 A feature of the present invention is a tire (pneumatic tire 10) including a circumferential land portion (circumferential land portion 20) that contacts a road surface and extends along a tire circumferential direction (tire circumferential direction D C ), A width direction narrow groove (width direction narrow groove 100) extending along the tread width direction (tread width direction D T ) is formed in the circumferential land portion, and the width direction narrow groove is a first narrow groove portion (first A narrow groove portion 110) and a second narrow groove portion (second narrow groove portion 120) communicating with the first narrow groove portion, and one side wall (side wall 111) of the first narrow groove portion is formed of the first narrow groove portion. The groove depth is inclined so as to become shallower as it goes away from the other side wall (side wall 112) of the first narrow groove portion along the tire circumferential direction, and is formed on one side wall of the second narrow groove portion, The side wall (side wall 121) formed on the side opposite to the one side wall of the one narrow groove portion has a groove depth of the second narrow groove portion along the tire circumferential direction. That inclined so that shallower as it gets farther away from the other side wall of the second groove fine (sidewall 122) and gist.

本発明の特徴によれば、小石など噛み込みを抑制しつつ、周方向陸部の偏摩耗を抑制し得るタイヤを提供することができる。   According to the characteristics of the present invention, it is possible to provide a tire that can suppress uneven wear of a circumferential land portion while suppressing biting of pebbles and the like.

本発明の実施形態に係る空気入りタイヤ10の概略斜視図である。1 is a schematic perspective view of a pneumatic tire 10 according to an embodiment of the present invention. 図１に示したF2枠線内の周方向陸部20の一部拡大図である。FIG. 2 is a partially enlarged view of a circumferential land portion 20 within the F2 frame shown in FIG. 1. 本発明の実施形態に係る幅方向細溝100の拡大斜視図である。1 is an enlarged perspective view of a width direction narrow groove 100 according to an embodiment of the present invention. 図３に示したF4-F4線に沿った周方向陸部20の断面図である。FIG. 4 is a cross-sectional view of a circumferential land portion 20 taken along line F4-F4 shown in FIG. 図３に示したF5-F5線に沿った周方向陸部20の断面図である。FIG. 4 is a cross-sectional view of the circumferential land portion 20 along the F5-F5 line shown in FIG. 3. 図３に示したF6-F6線に沿った周方向陸部20の断面図である。FIG. 4 is a cross-sectional view of a circumferential land portion 20 taken along line F6-F6 shown in FIG.

次に、本発明に係るタイヤ（空気入りタイヤ）の実施形態について、図面を参照しながら説明する。なお、以下の図面の記載において、同一または類似の部分には、同一または類似の符号を付している。ただし、図面は模式的なものであり、各寸法の比率などは現実のものとは異なることに留意すべきである。   Next, an embodiment of a tire (pneumatic tire) according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

したがって、具体的な寸法などは以下の説明を参酌して判断すべきである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれ得る。   Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

（１）空気入りタイヤの全体概略構成
図１は、空気入りタイヤ10の概略斜視図である。図１に示すように、空気入りタイヤ10は、路面に接地し、タイヤ周方向DCに沿って延びる周方向陸部20を備える。周方向陸部20は、タイヤ赤道線CLを含む位置に形成される。なお、空気入りタイヤ10には、空気に代えて、窒素ガスなどの不活性ガスを充填してもよい。 (1) Overall Schematic Configuration of Pneumatic Tire FIG. 1 is a schematic perspective view of a pneumatic tire 10. As shown in FIG. 1, the pneumatic tire 10 is grounded on the road surface, provided with a circumferential land portion 20 extending along the tire circumferential direction D C. The circumferential land portion 20 is formed at a position including the tire equator line CL. The pneumatic tire 10 may be filled with an inert gas such as nitrogen gas instead of air.

図２は、図１に示したF2枠線内の周方向陸部20の一部拡大図である。図２に示すように、周方向陸部20は、外側陸部30、中央陸部40及び外側陸部50によって構成される。外側陸部30及び外側陸部50は、中央陸部40のトレッド幅方向DTに設けられ、タイヤ周方向DCに沿って延びる。また、外側陸部30及び外側陸部50には、トレッド幅方向DTに延びる細溝31及び細溝51が形成される。細溝31及び細溝51は、サイプであり、本実施形態では、０．７ｍｍに設定される。 FIG. 2 is a partially enlarged view of the circumferential land portion 20 in the F2 frame shown in FIG. As shown in FIG. 2, the circumferential land portion 20 includes an outer land portion 30, a central land portion 40, and an outer land portion 50. The outer land portion 30 and the outer land portion 50, is provided in the tread width direction D T of the central land portion 40, extending along the tire circumferential direction D C. Further, the outer land portion 30 and the outer land portion 50 are formed with a narrow groove 31 and a narrow groove 51 extending in the tread width direction DT . The narrow groove 31 and the narrow groove 51 are sipes, and are set to 0.7 mm in this embodiment.

周方向陸部20には、トレッド幅方向DTに沿って延びる幅方向細溝100が形成される。幅方向細溝100は、第１細溝部110と第２細溝部120とを含む。 The circumferential land portion 20 is formed with a width direction narrow groove 100 extending along the tread width direction DT . The width direction narrow groove 100 includes a first narrow groove portion 110 and a second narrow groove portion 120.

また、本実施形態では、細溝31及び細溝51と、幅方向細溝100とによって、ヘルムホルツ共鳴器が構成される。具体的には、細溝31と第１細溝部110とによって第１のヘルムホルツ共鳴器が形成される。細溝31の幅は、第１細溝部110の幅よりも狭い。同様に、細溝51と第２細溝部120とによって第２のヘルムホルツ共鳴器が形成される。細溝51の幅は、第１細溝部110の幅よりも狭い。   In the present embodiment, the narrow groove 31, the thin groove 51, and the width direction narrow groove 100 constitute a Helmholtz resonator. Specifically, a first Helmholtz resonator is formed by the narrow groove 31 and the first narrow groove portion 110. The width of the narrow groove 31 is narrower than the width of the first narrow groove portion 110. Similarly, a second Helmholtz resonator is formed by the narrow groove 51 and the second narrow groove portion 120. The width of the narrow groove 51 is narrower than the width of the first narrow groove portion 110.

また、中央陸部40には、トレッド幅方向DTに沿って延びる幅方向サイプ140が形成される。幅方向サイプ140は、２つの幅方向細溝100の間に形成される。幅方向サイプ140の溝幅は、幅方向細溝100の溝幅よりも狭い。 Further, a width direction sipe 140 extending along the tread width direction D T is formed in the central land portion 40. The width direction sipe 140 is formed between the two width direction narrow grooves 100. The groove width of the width direction sipe 140 is narrower than the groove width of the width direction narrow groove 100.

（２）幅方向細溝100の詳細形状
次に、図３〜図６を参照して、幅方向細溝100の詳細形状、特に、幅方向細溝100の形状について説明する。図３は、幅方向細溝100の拡大斜視図である。図４は、図３に示したF4-F4線に沿った周方向陸部20の断面図である。図５は、図３に示したF5-F5線に沿った周方向陸部20の断面図である。図６は、図３に示したF6-F6線に沿った周方向陸部20の断面図である。 (2) Detailed shape of width direction narrow groove 100 Next, with reference to FIGS. 3-6, the detailed shape of the width direction narrow groove 100, especially the shape of the width direction narrow groove 100 is demonstrated. FIG. 3 is an enlarged perspective view of the narrow groove 100 in the width direction. FIG. 4 is a cross-sectional view of the circumferential land portion 20 along line F4-F4 shown in FIG. FIG. 5 is a cross-sectional view of the circumferential land portion 20 along line F5-F5 shown in FIG. FIG. 6 is a cross-sectional view of the circumferential land portion 20 along the line F6-F6 shown in FIG.

幅方向細溝100は、第１細溝部110、第２細溝部120及び周方向細溝部130によって構成される。   The width direction narrow groove 100 includes a first narrow groove portion 110, a second narrow groove portion 120, and a circumferential direction narrow groove portion 130.

第１細溝部110の一方の側壁111、及び第２細溝部120の一方の側壁121は、タイヤ周方向DC及びタイヤ径方向DRに沿った断面において、曲線状である。 One side wall 121 of one of the side walls 111, and the second narrow groove 120 of the first narrow groove 110, in cross-section along the tire circumferential direction D C and the tire radial direction D R, is curved.

側壁111は、第１細溝部110の溝深さがタイヤ周方向DCに沿って第１細溝部110の側壁112から遠ざかるに連れて浅くなるように傾斜する。同様に、第２細溝部120の一方の側壁であって、第１細溝部110の側壁111とは逆側に形成される側壁121は、第２細溝部120の溝深さがタイヤ周方向DCに沿って第２細溝部120の側壁122から遠ざかるに連れて浅くなるように傾斜する。 Sidewalls 111, groove depth of the first narrow groove 110 is inclined so that shallower as it gets farther away from the sidewall 112 of the first narrow groove 110 along the tire circumferential direction D C. Similarly, one side wall of the second narrow groove portion 120 and the side wall 121 formed on the side opposite to the side wall 111 of the first narrow groove portion 110 has a groove depth of the second narrow groove portion 120 in the tire circumferential direction D. It inclines so that it may become shallow as it goes away from the side wall 122 of the 2nd narrow groove part 120 along C. As shown in FIG.

一方、第１細溝部110の他方の側壁112、及び第２細溝部120の他方の側壁122は、傾斜することなく、タイヤ周方向DCと略平行に立ち上がっている。 On the other hand, the other side wall 122 of the other side wall 112, and the second narrow groove 120 of the first narrow groove 110, without tilting, rises in parallel to the tire circumferential direction D C approximately.

周方向細溝部130は、タイヤ周方向に沿って延びる。周方向細溝部130の溝幅は、本実施形態では、０．４ｍｍに設定される。周方向細溝部130の一端は、第１細溝部110連通する。また、周方向細溝部130の他端は、第２細溝部120と連通する。   The circumferential narrow groove portion 130 extends along the tire circumferential direction. In this embodiment, the groove width of the circumferential narrow groove portion 130 is set to 0.4 mm. One end of the circumferential narrow groove portion 130 communicates with the first narrow groove portion 110. Further, the other end of the circumferential narrow groove portion 130 communicates with the second narrow groove portion 120.

（３）作用・効果
空気入りタイヤ10では、側壁111は、第１細溝部110の溝深さがタイヤ周方向DCに沿って第１細溝部110の側壁112から遠ざかるに連れて浅くなるように傾斜する。同様に、第２細溝部120の一方の側壁であって、第１細溝部110の側壁111とは逆側に形成される側壁121は、第２細溝部120の溝深さがタイヤ周方向DCに沿って第２細溝部120の側壁122から遠ざかるに連れて浅くなるように傾斜する。 (3) In the operation and effect pneumatic tire 10, the sidewalls 111, such that the groove depth of the first narrow groove 110 becomes shallower as it gets farther away from the sidewall 112 of the first narrow groove 110 along the tire circumferential direction D C Inclined to. Similarly, one side wall of the second narrow groove portion 120 and the side wall 121 formed on the side opposite to the side wall 111 of the first narrow groove portion 110 has a groove depth of the second narrow groove portion 120 in the tire circumferential direction D. It inclines so that it may become shallow as it goes away from the side wall 122 of the 2nd narrow groove part 120 along C. As shown in FIG.

このため、幅方向細溝100に小石などが入り込んでも、傾斜した側壁111及び側壁121によって、入り込んだ小石が排出され易い。また、幅方向細溝100が複数形成されるため、トレッド幅方向DTにおけるセンター領域の偏摩耗を効果的に抑制し得る。 For this reason, even if pebbles and the like enter the width direction narrow groove 100, the inclined pebbles are easily discharged by the inclined side walls 111 and 121. In addition, since a plurality of widthwise narrow grooves 100 are formed, uneven wear in the center region in the tread width direction DT can be effectively suppressed.

また、外側陸部30及び外側陸部50には、上述したように細溝31及び細溝51がそれぞれ形成されるため、細溝31及び細溝51と、幅方向細溝100とによって、ヘルムホルツ共鳴器が構成され、気柱管共鳴音を低減する効果もある。   Further, since the narrow groove 31 and the narrow groove 51 are formed in the outer land portion 30 and the outer land portion 50, respectively, the Helmholtz is formed by the narrow groove 31 and the narrow groove 51 and the widthwise narrow groove 100 as described above. A resonator is formed, and there is an effect of reducing air column resonance noise.

本実施形態では、周方向細溝部130が設けられるため、幅方向細溝100に小石などが入り難い構造となっている。さらに、側壁111及び側壁121は曲線状である。このため、幅方向細溝100に小石が入り込んでも、容易に排出され易い。   In the present embodiment, since the circumferential narrow groove portion 130 is provided, it has a structure in which pebbles and the like do not easily enter the width narrow groove 100. Further, the side wall 111 and the side wall 121 are curved. For this reason, even if pebbles enter the width direction narrow groove 100, they are easily discharged.

（４）その他の実施形態
上述したように、本発明の実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかとなる。 (4) Other Embodiments As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it is understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. Should not. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

例えば、第１細溝部110の側壁111、及び第２細溝部120の側壁121は、タイヤ周方向DC及びタイヤ径方向DRに沿った断面において、曲線状ではなく、直線状であってもよい。また、周方向陸部20は、必ずしもセンター領域、具体的には、タイヤ赤道線CLを含む位置に形成されていなくても構わない。また、幅方向細溝100は、周方向細溝部130を含まない構成としてもよい。 For example, the side wall 121 of the side wall 111, and the second narrow groove 120 of the first narrow groove 110, in cross-section along the tire circumferential direction D C and the tire radial direction D R, rather than curved, be straight Good. Further, the circumferential land portion 20 does not necessarily have to be formed at the center region, specifically, at a position including the tire equator line CL. Further, the width direction narrow groove 100 may be configured not to include the circumferential direction narrow groove portion 130.

このように、本発明は、ここでは記載していない様々な実施の形態などを含むことは勿論である。したがって、本発明の技術的範囲は、上述の説明から妥当な特許請求の範囲に係る発明特定事項によってのみ定められる。   As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is determined only by the invention specifying matters according to the scope of claims reasonable from the above description.

10…空気入りタイヤ
20…周方向陸部
30…外側陸部
40…中央陸部
50…外側陸部
100…幅方向細溝
110…第１細溝部
111, 112…側壁
120…第２細溝部
121,122…側壁
130…周方向細溝部
140…幅方向サイプ 10 ... Pneumatic tire
20 ... Circumferential land
30 ... Outside land
40 ... Central land
50… Outer land
100: narrow groove in the width direction
110 ... 1st narrow groove
111, 112 ... sidewall
120 ... Second narrow groove
121,122… Sidewall
130: Circumferential narrow groove
140… Sipe in the width direction

Claims (5)

路面に接地し、タイヤ周方向に沿って延びる周方向陸部を備えるタイヤであって、
前記周方向陸部には、トレッド幅方向に沿って延びる幅方向細溝が形成され、
前記幅方向細溝は、
第１細溝部と、
前記第１細溝部に連通する第２細溝部と
を含み、
前記第１細溝部の一方の側壁は、前記第１細溝部の溝深さがタイヤ周方向に沿って前記第１細溝部の他方の側壁から遠ざかるに連れて浅くなるように傾斜し、
前記第２細溝部の一方の側壁であって、前記第１細溝部の一方の側壁とは逆側に形成される側壁は、前記第２細溝部の溝深さがタイヤ周方向に沿って前記第２細溝部の他方の側壁から遠ざかるに連れて浅くなるように傾斜するタイヤ。 A tire having a circumferential land portion that contacts the road surface and extends along the tire circumferential direction,
A width direction narrow groove extending along the tread width direction is formed in the circumferential land portion,
The widthwise narrow groove is
A first narrow groove,
A second narrow groove portion communicating with the first narrow groove portion,
One side wall of the first narrow groove portion is inclined so that the groove depth of the first narrow groove portion becomes shallower as the distance from the other side wall of the first narrow groove portion increases along the tire circumferential direction,
One side wall of the second narrow groove portion, which is formed on the side opposite to the one side wall of the first narrow groove portion, the groove depth of the second narrow groove portion is the tire circumferential direction along the tire circumferential direction. The tire which inclines so that it may become shallow as it distances from the other side wall of a 2nd narrow groove part. 前記周方向陸部には、タイヤ周方向に沿って延びる周方向細溝部が形成され、
前記周方向細溝部の一端は、前記第１細溝部と連通し、
前記周方向細溝部の他端は、前記第２細溝部と連通する請求項１に記載のタイヤ。 In the circumferential land portion, a circumferential narrow groove portion extending along the tire circumferential direction is formed,
One end of the circumferential narrow groove portion communicates with the first narrow groove portion,
The tire according to claim 1, wherein the other end of the circumferential narrow groove portion communicates with the second narrow groove portion. 前記第１細溝部の一方の側壁、及び前記第２細溝部の一方の側壁は、タイヤ周方向及びタイヤ径方向に沿った断面において、直線状である請求項１または２に記載のタイヤ。   The tire according to claim 1 or 2, wherein one side wall of the first narrow groove portion and one side wall of the second narrow groove portion are linear in a cross section along the tire circumferential direction and the tire radial direction. 前記第１細溝部の一方の側壁、及び前記第２細溝部の一方の側壁は、タイヤ周方向及びタイヤ径方向に沿った断面において、曲線状である請求項１または２に記載のタイヤ。   The tire according to claim 1 or 2, wherein one side wall of the first narrow groove portion and one side wall of the second narrow groove portion are curved in a cross section along the tire circumferential direction and the tire radial direction. 前記周方向陸部は、タイヤ赤道線を含む位置に形成される請求項１乃至４の何れか一項に記載のタイヤ。   The tire according to any one of claims 1 to 4, wherein the circumferential land portion is formed at a position including a tire equator line.
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