JP4549074B2 - Pneumatic radial tire - Google Patents

Pneumatic radial tire Download PDF

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JP4549074B2
JP4549074B2 JP2004040459A JP2004040459A JP4549074B2 JP 4549074 B2 JP4549074 B2 JP 4549074B2 JP 2004040459 A JP2004040459 A JP 2004040459A JP 2004040459 A JP2004040459 A JP 2004040459A JP 4549074 B2 JP4549074 B2 JP 4549074B2
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land portion
narrow groove
depth
pneumatic radial
radial tire
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JP2005231420A (en
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明彦 新開
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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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
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0348—Narrow grooves, i.e. having a width of less than 4 mm
    • 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
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0353—Circumferential grooves characterised by width
    • 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
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0355—Circumferential grooves characterised by depth

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Description

本発明は、空気入りラジアルタイヤに関し、より詳しくは騒音低減と偏摩耗の抑制に関する。   The present invention relates to a pneumatic radial tire, and more particularly to noise reduction and suppression of uneven wear.

横溝に区画された陸部を備えた空気入りラジアルタイヤにおいて、当該陸部の踏み込み側と蹴り出し側において、圧力と変位の積の接地過程における累積で表される摩擦エネルギーの差が生じる。その結果、周方向の段差偏摩耗（トウアンドヒール偏摩耗）が発生し、特に制動時に圧力が高くなるショルダー領域において顕著となる。また、横溝によって区画された陸部を備えた場合、接地踏み込み端における打撃音が大きくなる。そのため、ショルダー領域に周方向に連なる細溝を設けて、偏摩耗の抑制及び騒音性能の低減を図ってきた。   In a pneumatic radial tire having a land portion divided into lateral grooves, a difference in friction energy expressed by accumulation in the contact process of the product of pressure and displacement occurs on the stepping side and the kicking side of the land portion. As a result, circumferential uneven step wear (toe and heel uneven wear) occurs, and is particularly noticeable in the shoulder region where the pressure increases during braking. Moreover, when the land part divided by the horizontal groove is provided, the striking sound at the contact step is increased. Therefore, a narrow groove continuous in the circumferential direction is provided in the shoulder region to suppress uneven wear and reduce noise performance.

例えば、特許文献１に開示された空気入りタイヤにおいては、ショルダー領域に縦副溝を刻んで偏摩耗の抑制を図っている。
特開平６−８７３０３号公報 For example, in the pneumatic tire disclosed in Patent Document 1, longitudinal sub-grooves are cut in the shoulder region to suppress uneven wear.
JP-A-6-87303

制動時において、蹴り出し側の摩擦エネルギーが踏み込み側より高いため、蹴り出し側の摩耗が大きくなる段差偏摩耗が発生しやすいことが知られている。しかし、タイヤの回転方向が指定された場合、タイヤを交換するまで、蹴り出し側と踏み込み側は固定されたままである。そのため、段差偏摩耗が発生しやすく、騒音性能も悪化する。   During braking, it is known that uneven wear on the kicking side tends to occur because the frictional energy on the kicking side is higher than that on the stepping side, and wear on the kicking side becomes large. However, if the direction of rotation of the tire is specified, the kicking side and the stepping side remain fixed until the tire is replaced. For this reason, uneven uneven wear is likely to occur, and noise performance is also deteriorated.

本発明の目的は、回転方向が指定された場合において、騒音低減と偏摩耗抑制とを両立させた空気入りラジアルタイヤを提供することにある。   An object of the present invention is to provide a pneumatic radial tire that achieves both noise reduction and uneven wear suppression when a rotational direction is specified.

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、回転方向が指定された空気入りラジアルタイヤにおいて、
トレッドのショルダー領域に刻まれた周方向に連なる細溝と、前記細溝に連通する横溝と、前記細溝と前記横溝とによって区画された陸部を備え、
周方向に連続する複数の前記陸部において、最も踏み込み側にある前記陸部の踏み込み側から、最も蹴り出し側にある前記陸部の蹴り出し側にかけて、前記細溝の深さが徐々に深くなっていることを特徴とする空気入りラジアルタイヤとした。 To solve the above problem, a result of intensive studies, the invention according to claim 1, in the pneumatic radial tire rotation direction is specified,
A narrow groove continuous in the circumferential direction carved in the shoulder region of the tread, a lateral groove communicating with the narrow groove, and a land portion defined by the narrow groove and the lateral groove,
In the plurality of land portions that are continuous in the circumferential direction, the depth of the narrow groove gradually increases from the stepping side of the land portion closest to the stepping side to the kicking side of the land portion closest to the kicking side. It was set as the pneumatic radial tire characterized by becoming.

陸部を区画する横溝が周方向に連なる細溝に連通するため、当該陸部の打撃音が緩和され、騒音性能が低減される。また、踏み込み側に比べて、当該陸部の蹴り出し側の細溝の深さがより深いので、当該陸部の蹴り出し側の剛性が低下する。その結果、蹴り出し側において、陸部の圧力が低下し滑りが抑制され、摩擦エネルギーが小さくなる。逆に、踏み込み側において、陸部の圧力が上昇し滑りが発生し、摩擦エネルギーが大きくなる。したがって、蹴り出し側と踏み込み側での陸部の摩擦エネルギーが均一化されるので、陸部内の段差偏摩耗が抑制される。   Since the horizontal groove that divides the land portion communicates with the narrow groove that is continuous in the circumferential direction, the hitting sound of the land portion is alleviated and the noise performance is reduced. Moreover, since the depth of the narrow groove on the kicking side of the land portion is deeper than that on the stepping side, the rigidity on the kicking side of the land portion is reduced. As a result, on the kicking side, the pressure in the land portion is reduced, slippage is suppressed, and the friction energy is reduced. On the other hand, on the stepping side, the pressure in the land portion increases, slipping occurs, and the friction energy increases. Accordingly, the frictional energy of the land portion on the kicking side and the stepping side is made uniform, so that uneven wear in the land portion is suppressed.

なお、当該細溝の深さは、陸部の踏み込み側から陸部の蹴り出し側へと徐々に深くなる構造が好ましい。また、１つの陸部ごとに細溝の深さが変化してもよく、連続する複数の陸部内で細溝の深さが変化してもよい。   In addition, it is preferable that the depth of the narrow groove gradually increases from the stepping side of the land portion to the kicking side of the land portion. Further, the depth of the narrow groove may change for each land portion, and the depth of the narrow groove may change within a plurality of continuous land portions.

請求項２に記載の発明は、周方向に連続する複数の前記陸部において、最も蹴り出し側にある前記陸部の蹴り出し側の前記細溝の深さが、最も踏み込み側にある前記陸部の踏み込み側の前記細溝の深さの１．２倍〜５倍である請求項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, in the plurality of land portions that are continuous in the circumferential direction, the depth of the narrow groove on the kick-out side of the land portion that is closest to the kick-out side is the land that is closest to the step-on side. 2. The pneumatic radial tire according to claim 1, which is 1.2 to 5 times the depth of the narrow groove on the stepping side of the portion.

特に、陸部の蹴り出し側の細溝の深さが、陸部の踏み込み側の細溝の深さの１．２倍〜５倍であると、段差偏摩耗の抑制が高まる。当該深さの比が１．２倍未満であると、蹴り出し側と踏み込み側との摩擦エネルギーの均一化が図れず、偏摩耗抑制の効果が得られない。また、５倍を超えると、陸部の蹴り出し側の剛性が過度に低下し、摩擦エネルギーが低下しすぎて、摩擦エネルギーの均一化が図れない。   In particular, when the depth of the narrow groove on the kicking side of the land portion is 1.2 to 5 times the depth of the narrow groove on the stepping side of the land portion, the suppression of uneven uneven wear increases. If the depth ratio is less than 1.2 times, the frictional energy between the kicking side and the stepping side cannot be made uniform, and the effect of suppressing uneven wear cannot be obtained. On the other hand, if it exceeds five times, the rigidity on the kicking side of the land portion is excessively decreased, the friction energy is excessively decreased, and the friction energy cannot be made uniform.

本発明の空気入りラジアルタイヤは、陸部を区画する横溝が周方向に連なる細溝に連通するため、当該陸部の打撃音が緩和され、騒音性能が低減される。また、踏み込み側に比べて、当該陸部の蹴り出し側の細溝の深さがより深いので、蹴り出し側と踏み込み側との陸部の摩擦エネルギーが均一化され、陸部内の段差偏摩耗が抑制される。   In the pneumatic radial tire of the present invention, the lateral grooves that define the land portion communicate with the narrow grooves that are continuous in the circumferential direction, so that the impact sound of the land portion is alleviated and the noise performance is reduced. In addition, since the depth of the narrow groove on the kicking side of the land portion is deeper than that on the stepping side, the frictional energy of the land portion on the kicking side and stepping side is made uniform, and uneven wear in the land portion is uneven. Is 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は、本発明に係る空気入りラジアルタイヤのパターンを示す概略図である。図において、トレッド１のショルダー領域ＳＨに周方向に連なる細溝４が刻まれている。横溝２、３は細溝４に連通し、横溝２、３及び細溝４によって陸部１１が区画されている。センター領域ＣＥには主溝１０が刻まれている。なお、タイヤの回転方向Ｒは指定されている。   Hereinafter, embodiments of a pneumatic radial tire according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a pattern of a pneumatic radial tire according to the present invention. In the figure, a narrow groove 4 continuous in the circumferential direction is carved in the shoulder region SH of the tread 1. The lateral grooves 2 and 3 communicate with the narrow groove 4, and the land portion 11 is defined by the lateral grooves 2 and 3 and the narrow groove 4. A main groove 10 is carved in the center region CE. The tire rotation direction R is specified.

陸部１１を区画する横溝２、３が周方向に連なる細溝４に連通するため、陸部１１の打撃音が緩和され、騒音性能が低減される。さらに、ショルダー領域ＳＨに刻まれた細溝４の深さは変化していて、陸部１１の蹴り出し側５の深さは陸部１１の踏み込み側６に比べて深くなっているので、陸部１１の蹴り出し側５の剛性が低下する。その結果、蹴り出し側５において、陸部１１の圧力が低下し滑りが抑制され、摩擦エネルギーが小さくなる。一方、踏み込み側６において、陸部１１の圧力が上昇し滑りが発生し、摩擦エネルギーが大きくなる。したがって、蹴り出し側５と踏み込み側６での陸部１１の摩擦エネルギーが均一化されるので、陸部１１内の段差偏摩耗が抑制される。また、陸部１１の接地踏み込み端における打撃音も緩和されるので、騒音性能も低減される。   Since the lateral grooves 2 and 3 that divide the land portion 11 communicate with the narrow grooves 4 that are continuous in the circumferential direction, the striking sound of the land portion 11 is alleviated and the noise performance is reduced. Furthermore, since the depth of the narrow groove 4 carved in the shoulder region SH has changed and the depth of the kicking side 5 of the land portion 11 is deeper than that of the stepping side 6 of the land portion 11, The rigidity of the kicking side 5 of the part 11 is lowered. As a result, on the kick-out side 5, the pressure of the land portion 11 is reduced, slippage is suppressed, and the friction energy is reduced. On the other hand, on the stepping side 6, the pressure of the land portion 11 rises to cause a slip, and the friction energy increases. Accordingly, the frictional energy of the land portion 11 on the kicking side 5 and the stepping side 6 is made uniform, so that uneven uneven wear in the land portion 11 is suppressed. Moreover, since the striking sound at the grounding stepping edge of the land portion 11 is reduced, the noise performance is also reduced.

図２（ｂ）は、図２（ａ）のＹ１−Ｙ２断面を示す。図において、横溝２、３に区画された陸部１１ごとに、細溝４の深さが踏み込み側６のｄ２から蹴り出し側５のｄ１へと徐々に深くなる構造となっている。図２（ｃ）及び（ｄ）では、それぞれ連続する２個及び３個の陸部１１内において、細溝４の深さが踏み込み側６のｄ２から蹴り出し側５のｄ１へと徐々に深くなる構造である。図２（ｅ）では、陸部１１ごとに、細溝４の深さが踏み込み側６のｄ２から蹴り出し側５のｄ１へと３段階に深くなる構造となっている。段階的に深さが変化させた構造であると、摩耗が進行し急激に細溝４の深さが変化してしまうので、徐々に深さを変化させた構造がより好ましい。   FIG. 2B shows a Y1-Y2 cross section of FIG. In the drawing, the depth of the narrow groove 4 is gradually increased from d2 on the stepping side 6 to d1 on the kicking side 5 for each land portion 11 partitioned into the lateral grooves 2 and 3. 2 (c) and 2 (d), the depth of the narrow groove 4 gradually increases from d2 on the stepping side 6 to d1 on the kicking side 5 in two and three consecutive land portions 11, respectively. It is the structure which becomes. In FIG. 2 (e), the depth of the narrow groove 4 is deepened in three stages from d2 on the stepping side 6 to d1 on the kicking side 5 for each land portion 11. When the depth of the structure is changed stepwise, the wear progresses and the depth of the narrow groove 4 changes abruptly. Therefore, a structure in which the depth is gradually changed is more preferable.

陸部１１の蹴り出し側５の細溝４の深さが、陸部１１の踏み込み側６の細溝４の深さの１．２倍〜５倍が好ましい。最も浅い陸部１１の踏み込み側６の深さは１ｍｍ以上が好ましい。１ｍｍ未満であると、打撃音の緩和効果が小さく騒音を低減することができない。また、細溝４の幅は特に限定されないが０．５ｍｍ〜３ｍｍが好ましい。   The depth of the narrow groove 4 on the kicking side 5 of the land portion 11 is preferably 1.2 to 5 times the depth of the narrow groove 4 on the stepping side 6 of the land portion 11. The depth of the stepping side 6 of the shallowest land portion 11 is preferably 1 mm or more. If it is less than 1 mm, the impact sound mitigating effect is small and noise cannot be reduced. Moreover, although the width | variety of the narrow groove 4 is not specifically limited, 0.5 mm-3 mm are preferable.

なお、ショルダー領域ＳＨとは接地幅ＴＷをタイヤ幅方向に三等分した領域のうち、両側の領域を言う。ここで、接地幅ＴＷは、ＥＴＲＴＯ規格に準じた正規リムに組み込み、正規内圧を充填し、平板上に設計最大荷重の７０％の負荷を与えたときにタイヤ幅方向に接地している最大幅である。   The shoulder region SH is a region on both sides of a region obtained by dividing the ground contact width TW into three equal parts in the tire width direction. Here, the contact width TW is the maximum width that is grounded in the tire width direction when it is incorporated in a normal rim conforming to the ETRTO standard, filled with normal internal pressure, and a load of 70% of the design maximum load is applied on the flat plate. It is.

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比較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。実施例及び比較例２は図１に示すパターンを有するタイヤである。表１に示すように、実施例の細溝の深さは変化しているが、比較例２の細溝の深さは一定である。比較例１は図３に示すパターンを有するタイヤで、細溝を備えず横溝１２、１３は、陸部１１内のタイヤ幅方向中心側で閉塞している。なお、タイヤサイズは２２５／４５ＺＲ１７で、空気圧を２２０ｋＰａとして２５００ｃｃ乗用車に装着して、２名乗車の荷重条件で性能評価を行った。   As an example, a pneumatic radial tire according to the present invention and a pneumatic radial tire according to a comparative example were prototyped and performance evaluation was performed. Example and Comparative Example 2 are tires having the pattern shown in FIG. As shown in Table 1, the depth of the narrow groove of the example is changing, but the depth of the narrow groove of Comparative Example 2 is constant. The comparative example 1 is a tire having the pattern shown in FIG. The tire size was 225 / 45ZR17, the air pressure was set to 220 kPa, and it was mounted on a 2500 cc passenger car, and performance evaluation was performed under the load condition of two passengers.

摩耗評価は、１００００ｋｍ走行後の段差偏摩耗量の逆数を比較例１を１００とした指数で表している。騒音評価は、４つの速度モード（４０ｋｍ／ｈ、８０ｋｍ／ｈ、１２０ｋｍ／ｈ及び４０ｋｍから０ｋｍ）での騒音の官能評価値を新品時の比較例１を１００とした指数で示している。したがって、いずれの評価においても数値が大きいほど性能が良いことを示す。   In the wear evaluation, the reciprocal of the uneven uneven wear amount after traveling 10,000 km is represented by an index with Comparative Example 1 as 100. In the noise evaluation, the sensory evaluation value of noise in the four speed modes (40 km / h, 80 km / h, 120 km / h, and 40 km to 0 km) is indicated by an index with Comparative Example 1 at the time of new article as 100. Therefore, in any evaluation, it shows that performance is so good that a numerical value is large.

Figure 0004549074
Figure 0004549074

表１に示す結果によれば、本発明に係る空気入りラジアルタイヤでは、比較例１、２に比べ段差偏摩耗が抑制されている。新品時において騒音性能が比較例２に比べやや劣化するが、摩耗が進行しても騒音性能の劣化が顕著ではない。したがって、騒音低減と段差偏摩耗の抑制とを両立させることができた。   According to the results shown in Table 1, uneven wear on the step is suppressed in the pneumatic radial tire according to the present invention as compared with Comparative Examples 1 and 2. Although the noise performance is slightly deteriorated as compared with Comparative Example 2 at the time of a new article, the deterioration of the noise performance is not remarkable even when wear progresses. Therefore, it was possible to achieve both noise reduction and suppression of uneven uneven wear.

本発明に係る空気入りラジアルタイヤのパターン展開図である。It is a pattern development view of a pneumatic radial tire according to the present invention. 細溝の断面を示す図である。It is a figure which shows the cross section of a narrow groove. 比較例１に係る空気入りラジアルタイヤのパターン展開図である。2 is a pattern development view of a pneumatic radial tire according to Comparative Example 1. FIG.

符号の説明Explanation of symbols

１ トレッド
２、３ 横溝
４ 細溝
１０ 主溝
１１ 陸部
1 Tread 2, 3 Horizontal groove 4 Narrow groove 10 Main groove 11 Land

Claims (2)

回転方向が指定された空気入りラジアルタイヤにおいて、
トレッドのショルダー領域に刻まれた周方向に連なる細溝と、前記細溝に連通する横溝と、前記細溝と前記横溝とによって区画された陸部を備え、
周方向に連続する複数の前記陸部において、最も踏み込み側にある前記陸部の踏み込み側から、最も蹴り出し側にある前記陸部の蹴り出し側にかけて、前記細溝の深さが徐々に深くなっていることを特徴とする空気入りラジアルタイヤ。 In the pneumatic radial tire rotation direction is specified,
A narrow groove continuous in the circumferential direction carved in the shoulder region of the tread, a lateral groove communicating with the narrow groove, and a land portion defined by the narrow groove and the lateral groove,
In the plurality of land portions that are continuous in the circumferential direction, the depth of the narrow groove gradually increases from the stepping side of the land portion closest to the stepping side to the kicking side of the land portion closest to the kicking side. Pneumatic radial tire characterized by 周方向に連続する複数の前記陸部において、最も蹴り出し側にある前記陸部の蹴り出し側の前記細溝の深さが、最も踏み込み側にある前記陸部の踏み込み側の前記細溝の深さの１．２倍〜５倍である請求項１に記載の空気入りラジアルタイヤ。 In the plurality of land portions that are continuous in the circumferential direction, the depth of the narrow groove on the kick-out side of the land portion that is closest to the kick-out side is the depth of the narrow groove on the push- down side of the land portion that is closest to the step-down side . The pneumatic radial tire according to claim 1, which is 1.2 to 5 times the depth.
JP2004040459A 2004-02-17 2004-02-17 Pneumatic radial tire Expired - Fee Related JP4549074B2 (en)

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JP4938316B2 (en) * 2006-01-20 2012-05-23 株式会社ブリヂストン Construction vehicle tires
JP2008184039A (en) * 2007-01-30 2008-08-14 Toyo Tire & Rubber Co Ltd Pneumatic tire
JP4754517B2 (en) 2007-03-13 2011-08-24 株式会社ブリヂストン Pneumatic radial tire
JP5519721B2 (en) * 2012-04-05 2014-06-11 株式会社ブリヂストン Pneumatic tire
DE102012108870A1 (en) * 2012-09-20 2014-03-20 Continental Reifen Deutschland Gmbh Vehicle tires
JP7106950B2 (en) * 2018-04-04 2022-07-27 住友ゴム工業株式会社 tire

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