JP5805244B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP5805244B2
JP5805244B2 JP2014052521A JP2014052521A JP5805244B2 JP 5805244 B2 JP5805244 B2 JP 5805244B2 JP 2014052521 A JP2014052521 A JP 2014052521A JP 2014052521 A JP2014052521 A JP 2014052521A JP 5805244 B2 JP5805244 B2 JP 5805244B2
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groove
tread
grooves
inclined groove
tire
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JP2014139080A (en
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幸洋 木脇
幸洋 木脇
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Bridgestone Corp
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Bridgestone Corp
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    • 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
    • B60C11/0302—Tread patterns directional pattern, i.e. with main rolling direction

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  • Mechanical Engineering (AREA)
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Description

本発明は、空気入りタイヤ、なかでも雪道を走行する自動車に用いる空気入りタイヤに関するものであり、特に氷上性能と雪上性能とを高い次元で両立させる技術を提案するものである。   The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire used for an automobile traveling on a snowy road, and particularly proposes a technique for achieving both high performance on ice and high performance on snow.

従来の空気入りタイヤでは、例えば特許文献１に記載のように、湿潤路面における排水性と乾燥路面における操縦安定性の向上させるために、トレッド踏面に、タイヤ赤道付近からタイヤショルダー端にまで延びる傾斜溝と、この傾斜溝に交差してタイヤ周方向に延びる周方向溝とを有することが一般的であった。   In a conventional pneumatic tire, for example, as described in Patent Document 1, in order to improve drainage performance on a wet road surface and handling stability on a dry road surface, an inclination extending from the vicinity of the tire equator to the tire shoulder end on the tread surface It is common to have a groove and a circumferential groove extending in the tire circumferential direction across the inclined groove.

しかるに、このようなタイヤで、雪上を走行すると、走行中に傾斜溝内等で踏み固めた雪が傾斜溝を経てトレッド端側に逃げてしまい、踏み固めた雪による高い雪柱剪断力を得ることができないため、雪上性能の不足が否めなかった。   However, when running on snow with such tires, the snow that has been stepped on in the inclined groove during running will escape to the tread end side through the inclined groove, and high snow column shearing force due to the solidified snow will be obtained. Since it was not possible, the lack of performance on snow could not be denied.

特開平１０−２４７０６号公報Japanese Patent Laid-Open No. 10-24706

そこで、本発明は、氷上性能を低減させることなく、特に雪上性能を向上させた空気入りタイヤを提供する。   Accordingly, the present invention provides a pneumatic tire that is particularly improved on snow performance without reducing on-ice performance.

本発明に係る空気入りタイヤは、トレッド踏面に、タイヤ赤道面付近からそれぞれのトレッド端に向けて、相互に離隔する方向に傾斜して延びるそれぞれの傾斜溝を配設してなるものであって、各傾斜溝の溝底に複数の凹部を設け、各傾斜溝に、トレッド周方向のいずれか一方に延在して陸部内で終了する、タイヤ表面視で略三角形状の副溝を傾斜溝より溝幅を狭くして配設し、前記副溝の溝底を傾斜溝の凹部と連続させ、各傾斜溝に、前記副溝を傾斜溝に沿って３本配設してなることを特徴とするものである。
また、本発明に係る空気入りタイヤは、トレッド踏面に、タイヤ赤道面付近からそれぞれのトレッド端に向けて、相互に離隔する方向に傾斜して延びるそれぞれの傾斜溝を配設してなるものであって、各傾斜溝の溝底に複数の凹部を設け、各傾斜溝に、トレッド周方向のいずれか一方に延在して陸部内で終了する、タイヤ表面視で略三角形状の副溝を傾斜溝より溝幅を狭くして配設し、前記副溝の溝底を傾斜溝の凹部と連続させ、各傾斜溝に、前記副溝を傾斜溝に沿って複数本配設するとともに、傾斜溝内で隣り合う前記副溝を交互にトレッド周方向に逆向きに延在させてなることを特徴とするものである。
The pneumatic tire according to the present invention is formed by disposing each inclined groove extending on the tread surface from the vicinity of the tire equatorial plane toward the respective tread ends in an inclining direction away from each other. , a plurality of recesses in the groove bottom of each inclined groove is provided, on each of the inclined grooves, the tread circumferential extend to either direction ends at the land portion, the inclined groove minor groove of a substantially triangular shape in a tire surface when viewed The groove width is narrower, the bottom of the sub-groove is continuous with the concave portion of the inclined groove, and each of the inclined grooves is provided with three sub-grooves along the inclined groove. It is what.
Further, the pneumatic tire according to the present invention is formed by disposing each inclined groove extending on the tread surface from the vicinity of the tire equatorial plane toward each tread end in an inclined direction in a mutually separated direction. A plurality of recesses are provided at the bottom of each inclined groove, and each inclined groove has a substantially triangular sub-groove as viewed from the tire surface , extending in one of the tread circumferential directions and ending within the land portion. The groove width is narrower than that of the inclined groove, the groove bottom of the auxiliary groove is connected to the recessed portion of the inclined groove, and each of the inclined grooves is provided with a plurality of auxiliary grooves along the inclined groove. The sub-grooves adjacent in the groove are alternately extended in the tread circumferential direction in the opposite direction.

なおここにおける、傾斜溝は、直線状の延在形態のみならず、ジグザグ状、波形状、クランク状等の形態で延在させることもできる。   In addition, the inclined groove | channel here can also be extended in forms, such as not only a linear extended form but zigzag shape, a wave shape, and a crank shape.

ところで、トレッド踏面の接地状態での溝の総面積Ｓ１に対する傾斜溝の面積Ｓ２の比Ｓ２／Ｓ１が０．６〜１の範囲を満たすことが好ましい。   By the way, it is preferable that the ratio S2 / S1 of the area S2 of the inclined groove to the total area S1 of the groove in the ground contact state of the tread surface satisfies the range of 0.6-1.

本発明に係る空気入りタイヤでは、タイヤ赤道面付近からトレッド端に向けて傾斜して延びる各傾斜溝の溝底に複数の凹部を設けることで、雪道を走行する際にタイヤが転動するのに伴って、傾斜溝、ひいては凹部に雪が入り込み、特に溝の容積が大きい凹部で多くの雪を押し固めるとともに、傾斜溝で押し固めた雪が凹部に留まることになり、押し固めた雪（雪柱）を傾斜溝等の溝壁が剪断する雪柱剪断力を効果的に得ることができる。その結果、雪上駆動性を向上させることができる。   In the pneumatic tire according to the present invention, by providing a plurality of concave portions at the bottom of each inclined groove extending inclinedly from the vicinity of the tire equatorial plane toward the tread end, the tire rolls when traveling on a snowy road. As a result, snow enters the inclined grooves and eventually the recesses, and in particular, a large amount of snow is pressed in the recesses with a large volume of the groove, and the snow that has been pressed by the inclined grooves remains in the recesses. It is possible to effectively obtain a snow column shearing force for shearing a column) by a groove wall such as an inclined groove. As a result, the drivability on snow can be improved.

（ａ）本発明の空気入りタイヤの一の実施形態を示すトレッドパターンの部分展開図であり、（ｂ）は（ａ）のＢ−Ｂ線に沿う拡大端面図である。(A) It is the partial expanded view of the tread pattern which shows one Embodiment of the pneumatic tire of this invention, (b) is an enlarged end elevation in alignment with the BB line of (a). （ａ）本発明の空気入りタイヤの他の実施形態を示すトレッドパターンの部分展開図であり、（ｂ）は（ａ）のＢ−Ｂ線に沿う拡大端面図である。(A) It is the partial expanded view of the tread pattern which shows other embodiment of the pneumatic tire of this invention, (b) is an enlarged end elevation in alignment with the BB line of (a).

以下に、図面を参照しながら本発明の空気入りタイヤを詳細に説明する。
図１は、（ａ）本発明の空気入りタイヤの一の実施形態を示すトレッドパターンの部分展開図であり、（ｂ）は（ａ）のＢ−Ｂ線に沿う拡大端面図である。
ここで、タイヤ内部の補強構造は、一般的なラジアルタイヤまたはバイアスタイヤのそれと同様であるので、図示を省略する。 Hereinafter, the pneumatic tire of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a partial development view of a tread pattern showing an embodiment of a pneumatic tire according to the present invention, and FIG. 1B is an enlarged end view taken along line BB in FIG.
Here, the reinforcing structure inside the tire is the same as that of a general radial tire or bias tire, and therefore illustration is omitted.

図中１はトレッド踏面の全体を示し、このトレッド踏面１には、図ではタイヤ赤道面にトレッド周方向に延在する一本の周溝２を配設し、この周溝２からそれぞれのトレッド端に向けて相互に離隔する方向に、傾斜角度２０〜８５°で弧状に傾斜して延びる複数の傾斜溝３を配設する。   In the figure, reference numeral 1 denotes the entire tread surface. In the tread surface 1, a single circumferential groove 2 extending in the tread circumferential direction is disposed on the tire equator surface, and each tread is provided from the circumferential groove 2 in the figure. A plurality of inclined grooves 3 extending in an arc shape at an inclination angle of 20 to 85 ° are arranged in directions away from each other toward the end.

図では、周溝２と二本の傾斜溝３で略四角形となるブロック４を区画し、周溝２を挟んで両側に位置するブロックはトレッド周方向に略半ピッチずらして配置する。   In the figure, the circumferential groove 2 and the two inclined grooves 3 divide a block 4 having a substantially rectangular shape, and the blocks located on both sides of the circumferential groove 2 are arranged so as to be shifted by approximately a half pitch in the tread circumferential direction.

それぞれの傾斜溝３には、トレッド周方向に延在して略三角形状の副溝５を、傾斜溝３に沿って三本配設し、この副溝はブロック４内で終了する。   In each inclined groove 3, three substantially triangular sub-grooves 5 extending in the tread circumferential direction are arranged along the inclined groove 3, and the sub-grooves end in the block 4.

そしてこの空気入りタイヤではさらに、各傾斜溝３の溝底に複数、図では三個の凹部６を設け、好ましくは、副溝５の溝底が傾斜溝の凹部と連続する。   Further, in this pneumatic tire, a plurality of, in the figure, three recesses 6 are provided in the groove bottom of each inclined groove 3, and preferably the groove bottom of the sub-groove 5 is continuous with the recess of the inclined groove.

図２は、（ａ）本発明の空気入りタイヤの他の実施形態を示すトレッドパターンの部分展開図であり、（ｂ）は（ａ）のＢ−Ｂ線に沿う拡大端面図である。   FIG. 2: is the partial expanded view of the tread pattern which shows other embodiment of the pneumatic tire of (a) this invention, (b) is an enlarged end elevation in alignment with the BB line of (a).

この実施形態では、図中１１はトレッド踏面の全体を示し、このトレッド踏面１１には、図ではタイヤ赤道面にトレッド周方向に延在する一本の周溝１２を配設し、この周溝１２からそれぞれのトレッド端に向けて相互に離隔する方向に、傾斜角度３０〜６０°で略直線状に傾斜して延びる複数の傾斜溝１３を配設する。   In this embodiment, reference numeral 11 in the drawing shows the entire tread surface, and the tread surface 11 is provided with a single circumferential groove 12 extending in the tread circumferential direction on the tire equator surface in the figure. A plurality of inclined grooves 13 extending in a substantially linear manner with an inclination angle of 30 to 60 ° are arranged in directions away from 12 toward the respective tread ends.

図では、周溝１２と二本の傾斜溝１３で略四角形となるブロック１４を区画し、周溝を挟んで両側に位置するブロック１４はトレッド周方向に略半ピッチずらして配置する。   In the figure, a substantially rectangular block 14 is defined by the circumferential groove 12 and the two inclined grooves 13, and the blocks 14 located on both sides of the circumferential groove are arranged with a substantially half pitch shift in the tread circumferential direction.

それぞれの傾斜溝１３には、トレッド幅方向に延在する副溝１５を、傾斜溝１３に沿ってトレッド半幅に二本配設し、この副溝１５はトレッド幅方向に隣接する傾斜溝と交差し、ブロック１４内で終了する。   Each inclined groove 13 is provided with two sub-grooves 15 extending in the tread width direction in the tread half width along the inclined groove 13, and the sub-grooves 15 intersect with the inclined grooves adjacent in the tread width direction. And the process ends in block 14.

そしてこの空気入りタイヤではさらに、各傾斜溝１３の溝底、図では傾斜溝の溝底の凹部１６と、傾斜溝１３と副溝１５の溝底にわたる凹部１７とを設ける。   Further, in this pneumatic tire, a groove bottom of each inclined groove 13, a concave portion 16 at the bottom of the inclined groove in the figure, and a concave portion 17 that extends over the bottom of the inclined groove 13 and the auxiliary groove 15 are provided.

この実施形態では、副溝１５内を移動した雪が傾斜溝１３で衝突して、特に雪柱が逃げないように傾斜溝１３と副溝１５の交差点で保持されるために、その交差位置で一層雪を強く踏み固めることができ、溝内の雪柱の剪断強度が増し、高い雪柱剪断力が得ることができる。   In this embodiment, the snow that has moved in the sub-groove 15 collides with the inclined groove 13 and is held at the intersection of the inclined groove 13 and the sub-groove 15 so that the snow column does not escape in particular. Snow can be strongly stepped and solidified, the shear strength of the snow column in the groove is increased, and a high snow column shear force can be obtained.

このような空気入りタイヤにおいてより好ましくは、各傾斜溝３，１３に、トレッド周方向またはトレッド幅方向に延在する副溝５，１５を傾斜溝３，１３より溝幅を狭くして配設し、副溝５，１５の溝底を傾斜溝３，１３の凹部と連続させることで、傾斜溝３，１３と副溝５，１５内の雪が踏み固められ、特にその交差位置で一層強く踏み固められるので、溝内の雪柱の剪断強度が増し、高い雪柱剪断力が得ることができる。   In such a pneumatic tire, more preferably, the auxiliary grooves 5 and 15 extending in the tread circumferential direction or the tread width direction are arranged in the inclined grooves 3 and 13 with a groove width narrower than the inclined grooves 3 and 13. In addition, by making the bottoms of the sub-grooves 5 and 15 continuous with the recesses of the slant grooves 3 and 13, the snow in the slant grooves 3 and 13 and the sub-grooves 5 and 15 can be stepped on, especially at the intersections. Since it is hardened, the shear strength of the snow column in the groove increases, and a high snow column shear force can be obtained.

また好ましくは、トレッド踏面の接地状態での溝の総面積Ｓ１に対する傾斜溝３，１３の面積Ｓ２の比Ｓ２／Ｓ１が０．６〜１を満たし、この範囲とすることで、傾斜溝３，１３内の雪の流れを低減することができるとともに、傾斜溝３，１３内の押し固められた雪の雪柱剪断力を向上させることができる。   Preferably, the ratio S2 / S1 of the area S2 of the inclined grooves 3, 13 to the total area S1 of the grooves in the ground contact state of the tread tread satisfies 0.6 to 1, and by setting this range, the inclined grooves 3, It is possible to reduce the flow of snow in the snow 13 and to improve the snow column shear force of the snow that has been compacted in the inclined grooves 3 and 13.

そしてまた好ましくは、凹部の周溝２，１２または傾斜溝３，１３の溝底からの深さｈ１，ｈ２は、周溝２，１２または傾斜溝３，１３の、トレッド踏面からの溝高さｔ１，ｔ２の１／２以上〜１以下であり、この範囲とすることで、凹部内に積極的に雪が入り込んで傾斜溝３，１３の雪の流れを止めることができる。 And preferably, the depths h 1 and h 2 from the groove bottoms of the circumferential grooves 2 and 12 or the inclined grooves 3 and 13 of the recess are the grooves from the tread surface of the circumferential grooves 2 and 12 or the inclined grooves 3 and 13. The heights t 1 and t 2 are ½ or more to 1 or less of the height t 1 , and by setting the height within this range, snow can actively enter the recess and stop the flow of snow in the inclined grooves 3 and 13.

次に、図１に示すような構造を有する、サイズが２２５／４５Ｒ１７のサイズのタイヤを試作し、表１に示すように、それぞれの諸元を変化させた実施例タイヤ１，２および、比較例タイヤとのそれぞれにつき、雪上路面の駆動性能および氷上路面の制動性能を測定した。
なお、比較例タイヤは、トレッド部以外の構造については改変を要しないため、実施例タイヤに準ずるものとした。 Next, tires having a structure as shown in FIG. 1 and having a size of 225 / 45R17 were prototyped, and as shown in Table 1, tires 1 and 2 in which various specifications were changed and comparisons were made. For each example tire, the driving performance on the snow road surface and the braking performance on the ice road surface were measured.
In addition, since the comparative example tire does not require modification about structures other than the tread portion, it was assumed to conform to the example tire.

Figure 0005805244
Figure 0005805244

〔雪上路面の駆動性能〕
実施例タイヤ１，２および、比較例タイヤとのそれぞれにつき、サイズ１７×７Ｊのリムに組み付け、内圧２４０ｋＰａとして、車両に装着し、雪上を１０ｋｍ／ｈから４５ｋｍ／ｈまで加速する際の時間を指数評価し、その評価結果を表２に示す。
なお、表中の指数が大きいほど、雪上路面の駆動性能に優れていることを示す。 [Driving performance on snowy road surface]
For each of the example tires 1 and 2 and the comparative example tire, it was assembled on a rim having a size of 17 × 7 J, mounted on the vehicle with an internal pressure of 240 kPa, and the time required to accelerate from 10 km / h to 45 km / h Index evaluation was performed, and the evaluation results are shown in Table 2.
In addition, it shows that it is excellent in the drive performance of the road surface on snow, so that the index | exponent in a table | surface is large.

〔氷上路面の制動性能〕
実施例タイヤ１，２および、比較例タイヤとのそれぞれにつき、サイズ１７×７Ｊのリムに組み付け、内圧２４０ｋＰａとして、車両に装着し、氷上を３０ｋｍ／ｈの速度の走行状態からフル制動した時の制動距離を指数評価し、その評価結果を表２に示す。
なお、表中の指数が大きいほど、氷上路面の制動性能に優れていることを示す。 [Brake performance on ice surface]
Each of Example Tires 1 and 2 and Comparative Example Tire was assembled on a rim having a size of 17 × 7 J, mounted on a vehicle with an internal pressure of 240 kPa, and fully braked on the ice from a traveling state at a speed of 30 km / h. The braking distance is evaluated as an index, and the evaluation results are shown in Table 2.
In addition, it shows that it is excellent in the braking performance of the road surface on ice, so that the index | exponent in a table | surface is large.

Figure 0005805244
Figure 0005805244

表２の結果から、実施例タイヤ１は、比較例タイヤに対して、雪上路面の駆動性能および氷上路面の制動性能を向上させることができ、実施例タイヤ２は、比較例タイヤに対して、氷上路面の制動性能を低減させることなく雪上路面の駆動性能を向上させることができた。   From the results in Table 2, the example tire 1 can improve the driving performance of the road surface on snow and the braking performance of the road surface on ice with respect to the comparative example tire. The driving performance on the snowy road surface could be improved without reducing the braking performance on the snowy road surface.

１，１１ トレッド踏面
２，１２ 周溝
３，１３ 傾斜溝
４，１４ ブロック
５，１５ 副溝
６，１６，１７ 凹部 1,11 tread surface 2,12 circumferential groove 3,13 inclined groove 4,14 block 5,15 sub-groove 6,16,17 concave portion

Claims (3)

トレッド踏面に、タイヤ赤道面付近からそれぞれのトレッド端に向けて、相互に離隔する方向に傾斜して延びるそれぞれの傾斜溝を配設してなる空気入りタイヤにおいて、
各傾斜溝の溝底に複数の凹部を設け、
各傾斜溝に、トレッド周方向のいずれか一方に延在して陸部内で終了する、タイヤ表面視で略三角形状の副溝を傾斜溝より溝幅を狭くして配設し、前記副溝の溝底を傾斜溝の凹部と連続させ、
各傾斜溝に、前記副溝を傾斜溝に沿って３本配設してなることを特徴とする空気入りタイヤ。 In the pneumatic tire formed by disposing each inclined groove extending in a direction away from each other toward the tread end from the vicinity of the tire equatorial plane on the tread surface,
A plurality of recesses are provided at the bottom of each inclined groove,
In each inclined groove, a sub-groove having a substantially triangular shape as viewed from the tire surface and extending in one of the circumferential directions of the tread and having a narrower groove width than the inclined groove is disposed. The bottom of the groove is continuous with the recess of the inclined groove,
A pneumatic tire characterized in that each of the inclined grooves is provided with three sub-grooves along the inclined grooves. トレッド踏面に、タイヤ赤道面付近からそれぞれのトレッド端に向けて、相互に離隔する方向に傾斜して延びるそれぞれの傾斜溝を配設してなる空気入りタイヤにおいて、
各傾斜溝の溝底に複数の凹部を設け、
各傾斜溝に、トレッド周方向のいずれか一方に延在して陸部内で終了する、タイヤ表面視で略三角形状の副溝を傾斜溝より溝幅を狭くして配設し、前記副溝の溝底を傾斜溝の凹部と連続させ、
各傾斜溝に、前記副溝を傾斜溝に沿って複数本配設するとともに、傾斜溝内で隣り合う前記副溝を交互にトレッド周方向に逆向きに延在させてなることを特徴とする空気入りタイヤ。 In the pneumatic tire formed by disposing each inclined groove extending in a direction away from each other toward the tread end from the vicinity of the tire equatorial plane on the tread surface,
A plurality of recesses are provided at the bottom of each inclined groove,
In each inclined groove, a sub-groove having a substantially triangular shape as viewed from the tire surface and extending in one of the circumferential directions of the tread and having a narrower groove width than the inclined groove is disposed. The bottom of the groove is continuous with the recess of the inclined groove,
A plurality of the sub-grooves are arranged in each inclined groove along the inclined grooves, and the adjacent sub-grooves adjacent to each other in the inclined grooves are alternately extended in the tread circumferential direction. Pneumatic tire. トレッド踏面の接地状態での溝の総面積Ｓ１に対する傾斜溝の面積Ｓ２の比Ｓ２／Ｓ１が０．６〜１の範囲を満たしてなる請求項１または２に記載の空気入りタイヤ。   The pneumatic tire according to claim 1 or 2, wherein a ratio S2 / S1 of the area S2 of the inclined groove to the total area S1 of the groove in the ground contact state of the tread surface satisfies a range of 0.6-1.
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