JP2009119922A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2009119922A
JP2009119922A JP2007293308A JP2007293308A JP2009119922A JP 2009119922 A JP2009119922 A JP 2009119922A JP 2007293308 A JP2007293308 A JP 2007293308A JP 2007293308 A JP2007293308 A JP 2007293308A JP 2009119922 A JP2009119922 A JP 2009119922A
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tire
circumferential direction
blocks
tire circumferential
width
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Tetsuo Ikegami
哲生 池上
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire that reduces circumferential eccentric wear of the tire even if lengths in the tire circumferential direction of blocks are different from each other. <P>SOLUTION: Each non-penetrating part 1d between blocks 1c, in which circumferential lengths in the tire of the blocks 1c circumferentially adjacent to each other in the tire are small, is formed so as to have a larger width in the tire width direction than that of each non-penetrating part 1d between blocks 1c in which circumferential lengths of the tire of the blocks 1c circumferentially adjacent to each other in the tire are large. Even if circumferential lengths in the tire of the blocks 1c are different from each other, therefore, a rigidity of each block 1c is made almost uniform over the tire circumferentially. Thus, eccentric wear is reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば乗用車、トラック、バス等に用いられる空気入りタイヤに関するものである。   The present invention relates to a pneumatic tire used in, for example, passenger cars, trucks, buses and the like.

従来、この種の空気入りタイヤとしては、タイヤ周方向に延びる縦溝と、タイヤ幅方向に延びる横溝と、縦溝と横溝との間に形成されるブロックとを有し、タイヤ周方向の長さの異なるブロックをタイヤ周方向に配列することにより、ブロックと路面との接触によるノイズが特定の周波数で大きくならないようにして騒音の低減を図るようにしたものが知られている(例えば、特許文献1参照。)。また、タイヤ周方向に隣り合うブロック間に、横溝のタイヤ幅方向一端側が縦溝に貫通しないようにブロックの一部と連続する非貫通部を設け、非貫通部によってブロックの倒れ込みを抑制することにより、いわゆるヒールアンドトゥ摩耗を低減するようにしたものが知られている(例えば、特許文献2参照。)。
特開平11−291714号公報 特開2005−138678号公報
Conventionally, this type of pneumatic tire has a longitudinal groove extending in the tire circumferential direction, a lateral groove extending in the tire width direction, and a block formed between the longitudinal groove and the lateral groove, and is long in the tire circumferential direction. It is known that noise is reduced by arranging different blocks in the tire circumferential direction so that noise due to contact between the blocks and the road surface does not increase at a specific frequency (for example, patents). Reference 1). Also, between the blocks adjacent in the tire circumferential direction, a non-penetrating portion that is continuous with a part of the block is provided so that one end side in the tire width direction of the horizontal groove does not penetrate the vertical groove, and the collapse of the block is suppressed by the non-penetrating portion. Is known to reduce so-called heel and toe wear (see, for example, Patent Document 2).
JP 11-291714 A JP 2005-138678 A

ところで、前記空気入りタイヤにおいて、タイヤ周方向の長さの異なるブロックを配列した場合には、タイヤ周方向の長さが大きいブロックの剛性が高く、タイヤ周方向の長さが小さいブロックの剛性が低くなるため、ブロックの剛性の違いによりタイヤ周方向の偏摩耗を生ずるという問題点があった。また、非貫通部を設けたものにおいても、ブロックの剛性差による偏摩耗の発生は防止することができなかった。   By the way, in the pneumatic tire, when blocks having different lengths in the tire circumferential direction are arranged, the rigidity of the blocks having a large length in the tire circumferential direction is high, and the rigidity of the blocks having a small length in the tire circumferential direction is set. Therefore, there is a problem that uneven wear occurs in the tire circumferential direction due to the difference in rigidity of the blocks. Moreover, even in the case where the non-penetrating portion is provided, the occurrence of uneven wear due to the difference in the rigidity of the block cannot be prevented.

本発明は前記問題点に鑑みてなされたものであり、その目的とするところは、ブロックのタイヤ周方向の長さが異なっていても、タイヤ周方向の偏摩耗を低減することのできる空気入りタイヤを提供することにある。   The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a pneumatic system capable of reducing uneven wear in the tire circumferential direction even if the length of the block in the tire circumferential direction is different. To provide tires.

本発明は前記目的を達成するために、タイヤ周方向に延びる縦溝と、タイヤ幅方向に延びる横溝と、タイヤ周方向の長さが異なるように形成されたブロックとを備え、タイヤ周方向に隣り合うブロック間に、横溝のタイヤ幅方向一端側が縦溝に貫通しないようにブロックの一部と連続する非貫通部を設けた空気入りタイヤにおいて、タイヤ周方向に隣り合うブロックのタイヤ周方向の長さが小さいブロック間の非貫通部を、タイヤ周方向に隣り合うブロックのタイヤ周方向の長さが大きいブロック間の非貫通部よりもタイヤ幅方向の幅が大きくなるように形成している。   In order to achieve the above object, the present invention comprises a longitudinal groove extending in the tire circumferential direction, a lateral groove extending in the tire width direction, and a block formed so that the length in the tire circumferential direction is different, and in the tire circumferential direction. In a pneumatic tire provided with a non-penetrating part continuous with a part of the block so that one end side in the tire width direction of the lateral groove does not penetrate the longitudinal groove between adjacent blocks, the tire circumferential direction of the block adjacent to the tire circumferential direction is provided. The non-penetrating portion between the blocks having a small length is formed so that the width in the tire width direction is larger than the non-penetrating portion between the blocks having a large length in the tire circumferential direction of blocks adjacent in the tire circumferential direction. .

これにより、タイヤ周方向の長さの小さいブロック間の非貫通部のタイヤ幅方向の幅を、タイヤ周方向の長さの大きいブロック間の非貫通部のタイヤ幅方向の幅と等しくした場合に比べ、タイヤ周方向の長さの小さいブロックの剛性が高くなることから、ブロックのタイヤ周方向の長さが異なっていても、各ブロックの剛性がタイヤ周方向に亘ってほぼ均一になる。   As a result, when the width in the tire width direction of the non-penetrating portion between the blocks having a small length in the tire circumferential direction is made equal to the width in the tire width direction of the non-penetrating portion between the blocks having a large length in the tire circumferential direction. In comparison, since the rigidity of a block having a small length in the tire circumferential direction is increased, the rigidity of each block is substantially uniform in the tire circumferential direction even if the length of the block in the tire circumferential direction is different.

本発明によれば、ブロックのタイヤ周方向の長さが異なっていても、各ブロックの剛性をタイヤ周方向に亘ってほぼ均一にすることができるので、偏摩耗の低減を図ることができる。   According to the present invention, even if the lengths of the blocks in the tire circumferential direction are different, the rigidity of each block can be made substantially uniform over the tire circumferential direction, so that uneven wear can be reduced.

図1乃至図5は本発明の第1の実施形態を示すもので、図1は空気入りタイヤの部分正面断面図、図2はトレッド部の部分平面展開図、図3はその部分概略側面図、図4は試験タイヤのブロック長を示す図、図5は試験結果を示す図である。   1 to 5 show a first embodiment of the present invention. FIG. 1 is a partial front sectional view of a pneumatic tire, FIG. 2 is a partial plan view of a tread portion, and FIG. 3 is a partial schematic side view thereof. 4 is a diagram showing the block length of the test tire, and FIG. 5 is a diagram showing the test result.

同図に示す空気入りタイヤは、タイヤ外周面側に形成されるトレッド部1と、タイヤ幅方向両側に形成される一対のサイドウォール部2と、タイヤ幅方向両側に形成される一対のビード部3とから構成され、ビード部3にはビードコア3aが埋設されている。   The pneumatic tire shown in the figure includes a tread portion 1 formed on the tire outer peripheral surface side, a pair of sidewall portions 2 formed on both sides in the tire width direction, and a pair of bead portions formed on both sides in the tire width direction. 3, and a bead core 3 a is embedded in the bead portion 3.

トレッド部1は、タイヤ周方向に延びる複数の縦溝1aと、タイヤ幅方向に延びる複数の横溝1bと、縦溝1aと横溝1bの間に形成される複数のブロック1cとからなり、各ブロック1cはタイヤ周方向の長さが互いに異なる3通りの長さA,B,Cの何れかに形成されている。また、タイヤ周方向に隣り合うブロック1c間には、横溝1bのタイヤ幅方向一端側が縦溝1aに貫通しないようにブロック1cの一部と接地面が面一に連続する非貫通部1dが設けられ、タイヤ周方向に隣り合うブロック1cのタイヤ周方向の長さが小さいブロック1c間の非貫通部1dは、タイヤ周方向に隣り合うブロック1cのタイヤ周方向の長さが大きいブロック1c間の非貫通部1dよりもタイヤ幅方向の幅が大きくなるように形成されている。即ち、タイヤ周方向に隣り合うブロック1cのタイヤ周方向の長さの和をL1 、L2 、L3 、…Ln とし、ブロック1c間の非貫通部1dのタイヤ幅方向の幅をそれぞれW1 、W2 、W3 、…Wn とした場合、L1 >L2 >L3 >…>Ln であれば、W1 <W2 <W3 <…Wn となるように各非貫通部1dが形成されている。尚、各横溝1bのタイヤ周方向の幅は全て同一の幅であってもよく、ブロック1cのタイヤ周方向の長さに応じて異なる幅に形成されていてもよい。   The tread portion 1 includes a plurality of vertical grooves 1a extending in the tire circumferential direction, a plurality of horizontal grooves 1b extending in the tire width direction, and a plurality of blocks 1c formed between the vertical grooves 1a and the horizontal grooves 1b. 1c is formed in any one of three lengths A, B, and C having different tire circumferential lengths. Further, between the blocks 1c adjacent to each other in the tire circumferential direction, a non-penetrating portion 1d in which a part of the block 1c and the ground contact surface are flush with each other is provided so that one end in the tire width direction of the lateral groove 1b does not penetrate the vertical groove 1a. The non-penetrating portion 1d between the blocks 1c having a small length in the tire circumferential direction of the blocks 1c adjacent in the tire circumferential direction is between the blocks 1c having a large length in the tire circumferential direction of the blocks 1c adjacent in the tire circumferential direction. The width in the tire width direction is larger than that of the non-penetrating portion 1d. That is, the sum of the lengths in the tire circumferential direction of adjacent blocks 1c in the tire circumferential direction is L1, L2, L3,... Ln, and the width in the tire width direction of the non-penetrating portion 1d between the blocks 1c is W1, W2,. When W3,..., Wn, if L1> L2> L3> ...> Ln, the non-penetrating portions 1d are formed so that W1 <W2 <W3 <... Wn. In addition, the width in the tire circumferential direction of each lateral groove 1b may be the same width, or may be formed in different widths depending on the length of the block 1c in the tire circumferential direction.

以上のように構成された空気入りタイヤにおいては、タイヤ周方向の長さの異なるブロック1cがタイヤ周方向に配列されていることから、ブロックと路面との接触によるノイズが特定の周波数で大きくなることがなく、走行時の騒音が低減される。この場合、タイヤ周方向に隣り合うブロック1cのタイヤ周方向の長さが小さいブロック1c間の非貫通部1dは、タイヤ周方向に隣り合うブロック1cのタイヤ周方向の長さが大きいブロック間1cの非貫通部1dよりもタイヤ幅方向の幅が大きくなるように形成されているので、隣り合うブロック1cの長さが小さくなるほどブロック1c間の非貫通部1dのタイヤ幅方向の幅が大きくなる。これにより、タイヤ周方向の長さの小さいブロック1c間の非貫通部1dのタイヤ幅方向の幅を、タイヤ周方向の長さの大きいブロック1c間の非貫通部1dのタイヤ幅方向の幅と等しくした場合に比べ、タイヤ周方向の長さの小さいブロック1cの剛性が高くなることから、ブロック1cのタイヤ周方向の長さが異なっていても、各ブロック1cの剛性がタイヤ周方向に亘ってほぼ均一になる。   In the pneumatic tire configured as described above, since the blocks 1c having different lengths in the tire circumferential direction are arranged in the tire circumferential direction, noise due to contact between the blocks and the road surface increases at a specific frequency. This reduces noise during travel. In this case, the non-penetrating portion 1d between the blocks 1c having a small length in the tire circumferential direction of the blocks 1c adjacent in the tire circumferential direction is an inter-block 1c having a large length in the tire circumferential direction of the blocks 1c adjacent in the tire circumferential direction. Since the width in the tire width direction is larger than the non-penetrating portion 1d, the width of the non-penetrating portion 1d between the blocks 1c in the tire width direction increases as the length of the adjacent block 1c decreases. . Accordingly, the width in the tire width direction of the non-penetrating portion 1d between the blocks 1c having a small length in the tire circumferential direction is set to the width in the tire width direction of the non-penetrating portion 1d between the blocks 1c having a large length in the tire circumferential direction. Since the rigidity of the block 1c having a small length in the tire circumferential direction is higher than that in the case where they are equal, even if the length of the block 1c in the tire circumferential direction is different, the rigidity of each block 1c extends over the tire circumferential direction. Almost uniform.

ここで、本発明の実施例1及び比較例について、耐偏摩耗性の試験を行ったところ、図5に示す結果が得られた。実施例1には、隣り合うブロック1cのタイヤ周方向の長さの和L1 、L2 、L3 、…L6 に対し、ブロック1c間の非貫通部1dのタイヤ幅方向の幅をそれぞれW1 、W2 、W3 、…W6 がそれぞれ異なるものを用い、比較例には非貫通部1dのタイヤ幅方向の幅が全て同一のものを用いた。また、実施例1及び比較例には何れも横溝1bのタイヤ周方向の幅が7mmのものを用いた。例えば、L3 はタイヤ周方向の長さが最も大きいブロック1cの長さAと、タイヤ周方向の長さが最も小さいブロック1cの長さCとの和となる。   Here, when Example 1 and Comparative Example of the present invention were tested for uneven wear resistance, the results shown in FIG. 5 were obtained. In Example 1, the widths of the non-penetrating portions 1d between the blocks 1c in the tire width direction are W1, W2, and L6 in the tire circumferential direction of adjacent blocks 1c, respectively. W3,..., W6 are different from each other, and in the comparative example, the non-penetrating portion 1d has the same width in the tire width direction. Further, in each of Example 1 and Comparative Example, a lateral groove 1b having a width in the tire circumferential direction of 7 mm was used. For example, L3 is the sum of the length A of the block 1c having the largest length in the tire circumferential direction and the length C of the block 1c having the smallest length in the tire circumferential direction.

本試験では、タイヤサイズ235/45R17のタイヤを排気量2500ccの国産車に装着し、一周90mの8の字旋回路を旋回時最大横加速度0.8Gにて500周走行させた後、偏摩耗量を測定してその逆数を指数化し、比較例を100として実施例1を評価した。この場合、指数の値が大きいほど優位性があるとして評価した。試験の結果、実施例1は比較例に対し、耐偏摩耗性に優れている結果が得られた。   In this test, a tire with a tire size of 235 / 45R17 was mounted on a domestic car with a displacement of 2500 cc, and an 8-turn circuit with a circumference of 90 m was run for 500 laps at a maximum lateral acceleration of 0.8 G during turning. The quantity was measured and its reciprocal number was indexed, and Example 1 was evaluated using Comparative Example 100. In this case, it was evaluated that the larger the index value, the more superior. As a result of the test, Example 1 was superior to the comparative example in that it was superior in uneven wear resistance.

このように、本実施形態によれば、タイヤ周方向に隣り合うブロック1cのタイヤ周方向の長さが小さいブロック1c間の非貫通部1dを、タイヤ周方向に隣り合うブロック1cのタイヤ周方向の長さが大きいブロック1c間の非貫通部1dよりもタイヤ幅方向の幅が大きくなるように形成したので、ブロック1cのタイヤ周方向の長さが異なっていても、各ブロック1cの剛性をタイヤ周方向に亘ってほぼ均一にすることができ、偏摩耗の低減を図ることができる。   Thus, according to this embodiment, the non-penetrating portion 1d between the blocks 1c having a small length in the tire circumferential direction of the blocks 1c adjacent in the tire circumferential direction is replaced with the tire circumferential direction of the block 1c adjacent in the tire circumferential direction. Since the width in the tire width direction is larger than the non-penetrating portion 1d between the blocks 1c having a large length, the rigidity of each block 1c is increased even if the length in the tire circumferential direction of the block 1c is different. It can be made substantially uniform in the tire circumferential direction, and uneven wear can be reduced.

また、タイヤ周方向に隣接するブロック1cのタイヤ周方向の長さの和をL1 、L2 、L3 、…Ln とし、ブロック1c間の非貫通部1dのタイヤ幅方向の幅をそれぞれW1 、W2 、W3 、…Wn とした場合、L1 >L2 >L3 >…Ln であれば、W1 <W2 <W3 <…Wn となるように形成したので、ブロック1cの長さが小さくなるほどブロック1c間の非貫通部1dのタイヤ幅方向の幅が大きくなり、ブロック1cのタイヤ周方向の長さが3つの異なる長さに形成されていても、各ブロック1cの剛性をタイヤ周方向に亘ってほぼ均一にすることができる。   Further, the sum of the circumferential lengths of the blocks 1c adjacent in the tire circumferential direction is L1, L2, L3,... Ln, and the width in the tire width direction of the non-penetrating portion 1d between the blocks 1c is W1, W2,. When W3,..., Wn, if L1> L2> L3> ... Ln, W1 <W2 <W3 <... Wn, the non-penetration between the blocks 1c becomes smaller as the length of the block 1c becomes smaller. Even if the width of the portion 1d in the tire width direction is increased and the length of the block 1c in the tire circumferential direction is formed in three different lengths, the rigidity of each block 1c is made substantially uniform over the tire circumferential direction. be able to.

図6及び図8は本発明の第2の実施形態を示すもので、図6はトレッド部の部分概略側面図、図7はブロックの踏込側と蹴出側を示すタイヤの概略側面図、図8は試験結果を示す図である。尚、前記実施形態と同等の構成部分には同一の符号を付して示す。   6 and 8 show a second embodiment of the present invention. FIG. 6 is a partial schematic side view of a tread portion. FIG. 7 is a schematic side view of a tire showing a stepping side and a kicking side of a block. 8 is a diagram showing test results. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

本実施形態の非貫通部1eは、前記実施形態と同様、タイヤ周方向の長さの小さいブロック1c間の非貫通部1eのタイヤ幅方向の幅が、タイヤ周方向の長さの大きいブロック1c間の非貫通部1eよりもタイヤ幅方向の幅が大きくなるように形成されている。また、本実施形態のタイヤは、車両前進方向に対するタイヤ回転方向が特定されている。この場合、非貫通部1eに隣接するブロック1cのうち、車両前進方向において先に接地するブロック1c側の非貫通部1eのタイヤ幅方向の幅が、後に接地するブロック1c側の非貫通部1eのタイヤ幅方向の幅よりも小さくなるように非貫通部1eの端部が斜めに形成されている。これにより、非貫通部1eは、横溝1bを間にして一方のブロック1cの蹴出側(図中K部)となる方が、他方のブロック1cの踏込側(図中F部)となる方よりもタイヤ幅方向の幅が小さくなっている。即ち、タイヤ周方向の長さの和がL1 、L2 、L3 、…Ln となるブロック1c間の踏込側の非貫通部1eのタイヤ幅方向の幅をそれぞれW1-1 、W2-1 、W3-1 、…Wn-1 とし、蹴出側の非貫通部1eのタイヤ幅方向の幅をそれぞれW1-2 、W2-2 、W3-2 、…Wn-2 とすると、W1-1 >W1-2 、W2-1 >W2-2 、W3-1 >W3-2 、…Wn-1 >Wn-2 となるように形成されている。   The non-penetrating portion 1e of this embodiment is a block 1c in which the width in the tire width direction of the non-penetrating portion 1e between the blocks 1c having a small length in the tire circumferential direction is large in the tire circumferential direction, as in the above embodiment. It is formed so that the width in the tire width direction is larger than the non-penetrating portion 1e therebetween. Moreover, the tire rotation direction with respect to the vehicle forward direction is specified for the tire of this embodiment. In this case, of the blocks 1c adjacent to the non-penetrating portion 1e, the width in the tire width direction of the non-penetrating portion 1e on the block 1c side that contacts the ground first in the vehicle forward direction is the non-penetrating portion 1e on the block 1c side that contacts the ground later. The end portion of the non-penetrating portion 1e is formed obliquely so as to be smaller than the width in the tire width direction. As a result, the non-penetrating portion 1e becomes the stepping side (F portion in the figure) of the other block 1c when the non-penetrating portion 1e becomes the kicking side (K portion in the drawing) of one block 1c with the lateral groove 1b in between. The width in the tire width direction is smaller than that. That is, the width in the tire width direction of the non-penetrating portion 1e on the stepping side between the blocks 1c where the sum of the lengths in the tire circumferential direction is L1, L2, L3,... Ln is W1-1, W2-1, W3-, respectively. 1,..., Wn-1 and assuming that the width in the tire width direction of the non-penetrating portion 1e on the kick side is W1-2, W2-2, W3-2,. , W2-1> W2-2, W3-1> W3-2,... Wn-1> Wn-2.

ところで、一つのブロックに着目した場合、踏込側よりも蹴出側の方が摩耗し易いことが知られている。これは、接地面の剪断摩擦力が踏込側よりも蹴出側の方が大きくなりやすいためであるが、踏込側ブロック剛性を蹴出側よりも高くすれば、接地面の剪断摩擦力の差を小さくすることができる。   By the way, when paying attention to one block, it is known that the kicking side is more easily worn than the stepping side. This is because the shear frictional force on the ground contact surface tends to be larger on the kicking side than on the stepping side, but if the stepping block rigidity is higher than that on the kicking side, the difference in shear frictional force on the grounding surface Can be reduced.

本実施形態では、横溝1bを間にして一方のブロック1cの蹴出側となる方の非貫通部1eのタイヤ幅方向の幅が踏込側となる方の幅よりも小さくなっているので、その分だけブロック1cにおける蹴出側の剛性が低く、踏込側の剛性が高くなる。これにより、蹴出側の摩耗が少なくなり、ブロック1cの踏込側と蹴出側の摩耗をほぼ均一にすることができる。   In the present embodiment, since the width in the tire width direction of the non-penetrating portion 1e that is the kicking side of one block 1c with the lateral groove 1b in between is smaller than the width that is the stepping side, The kicking side rigidity of the block 1c is low and the stepping side rigidity is high. Thereby, wear on the kicking side is reduced, and wear on the stepping side and kicking side of the block 1c can be made substantially uniform.

ここで、本発明の実施例2及び比較例について、耐偏摩耗性の試験を行ったところ、図8に示す結果が得られた。実施例2には、踏込側の非貫通部1eのタイヤ幅方向の幅W1-1 、W2-1 、W3-1 、…W6-1 が蹴出側の非貫通部1eのタイヤ幅方向の幅W1-2 、W2-2 、W3-2 、…W6-2 よりも小さいものを用い、比較例には踏込側の非貫通部1eのタイヤ幅方向の幅W1-1 、W2-1 、W3-1 、…W6-1 と蹴出側の非貫通部1eのタイヤ幅方向の幅W1-2 、W2-2 、W3-2 、…W6-2 が同一のものを用いた。また、実施例2及び比較例には何れも横溝1bのタイヤ周方向の幅が7mmのものを用いた。   Here, when Example 2 and Comparative Example of the present invention were tested for uneven wear resistance, the results shown in FIG. 8 were obtained. In Example 2, the width W1-1, W2-1, W3-1,... W6-1 of the non-penetrating portion 1e on the stepping side is the width in the tire width direction of the non-penetrating portion 1e on the kicking side. W1-2, W2-2, W3-2,... Smaller than W6-2 are used, and in the comparative example, the width W1-1, W2-1, W3- 1,... W6-1 and the width W1-2, W2-2, W3-2,... W6-2 in the tire width direction of the non-penetrating portion 1e on the kicking side were used. Further, in each of Example 2 and Comparative Example, a lateral groove 1b having a width in the tire circumferential direction of 7 mm was used.

本試験では、第1の実施形態と同様の方法で試験を行った結果、実施例2は比較例に対し、耐偏摩耗性に優れている結果が得られた。   In this test, as a result of performing the test in the same manner as in the first embodiment, Example 2 was superior to the comparative example in terms of uneven wear resistance.

このように、本実施形態によれば、非貫通部1eに隣接するブロック1cのうち、車両前進方向において先に接地するブロック1c側の非貫通部1eのタイヤ幅方向の幅が、後に接地するブロック1c側の非貫通部1eのタイヤ幅方向の幅よりも小さくなるように非貫通部1eの端部を斜めに形成したので、前記実施形態と同様、タイヤ周方向全体としての偏摩耗を低減することができるとともに、各ブロック1cごとのタイヤ周方向の偏摩耗も低減することができ、耐偏摩耗性の向上に極めて有利である。   Thus, according to the present embodiment, the width in the tire width direction of the non-penetrating part 1e on the block 1c side that contacts the front in the vehicle forward direction among the blocks 1c adjacent to the non-penetrating part 1e is grounded later. Since the end of the non-penetrating portion 1e is formed obliquely so as to be smaller than the width in the tire width direction of the non-penetrating portion 1e on the block 1c side, as in the above-described embodiment, uneven wear as a whole in the tire circumferential direction is reduced. In addition, it is possible to reduce uneven wear in the tire circumferential direction for each block 1c, which is extremely advantageous for improving uneven wear resistance.

本発明の第1の実施形態を示す空気入りタイヤの部分正面断面図Partial front sectional view of the pneumatic tire showing the first embodiment of the present invention トレッド部の部分平面展開図Partial plan view of the tread トレッド部の部分概略側面図Partial schematic side view of the tread 試験タイヤのブロック長を示す図Diagram showing block length of test tire 試験結果を示す図Diagram showing test results 本発明の第2の実施形態を示すトレッド部の部分概略側面図The partial schematic side view of the tread part which shows the 2nd Embodiment of this invention ブロックの踏込側と蹴出側を示すタイヤの概略側面図Schematic side view of the tire showing the stepping side and kicking side of the block 試験結果を示す図Diagram showing test results

符号の説明Explanation of symbols

1a…縦溝、1b…横溝、1c…ブロック、1d,1e…非貫通部。   1a ... Vertical groove, 1b ... Horizontal groove, 1c ... Block, 1d, 1e ... Non-penetrating portion.

Claims (3)

タイヤ周方向に延びる縦溝と、タイヤ幅方向に延びる横溝と、タイヤ周方向の長さが異なるように形成されたブロックとを備え、タイヤ周方向に隣り合うブロック間に、横溝のタイヤ幅方向一端側が縦溝に貫通しないようにブロックの一部と連続する非貫通部を設けた空気入りタイヤにおいて、
タイヤ周方向に隣り合うブロックのタイヤ周方向の長さが小さいブロック間の非貫通部を、タイヤ周方向に隣り合うブロックのタイヤ周方向の長さが大きいブロック間の非貫通部よりもタイヤ幅方向の幅が大きくなるように形成した
ことを特徴とする空気入りタイヤ。
A longitudinal groove extending in the tire circumferential direction, a transverse groove extending in the tire width direction, and a block formed to have a different length in the tire circumferential direction, and between the blocks adjacent to each other in the tire circumferential direction, the tire width direction of the lateral groove In a pneumatic tire provided with a non-penetrating part continuous with a part of the block so that one end side does not penetrate the vertical groove,
The non-penetrating portion between blocks having a small length in the tire circumferential direction of blocks adjacent in the tire circumferential direction is larger than the non-penetrating portion between blocks having a large length in the tire circumferential direction of blocks adjacent in the tire circumferential direction. A pneumatic tire characterized by being formed to have a larger width in the direction.
タイヤ周方向に隣り合うブロックのタイヤ周方向の長さの和をそれぞれL1 、L2 、L3 、…Ln とし、これらのブロック間の非貫通部のタイヤ幅方向の幅をそれぞれW1 、W2 、W3 、…Wn とした場合、L1 >L2 >L3 >…>Ln であれば、W1 <W2 <W3 <…Wn となるように形成した
ことを特徴とする請求項1記載の空気入りタイヤ。
The sum of the lengths in the tire circumferential direction of adjacent blocks in the tire circumferential direction is L1, L2, L3,... Ln, and the width in the tire width direction of the non-penetrating portion between these blocks is W1, W2, W3, respectively. 2. The pneumatic tire according to claim 1, wherein, when Wn, L1>L2>L3>...> Ln, W1 <W2 <W3 <.
車両前進方向に対するタイヤ回転方向が特定されるとともに、
前記非貫通部に隣接するブロックのうち、車両前進方向において先に接地するブロック側の非貫通部のタイヤ幅方向の幅が、後に接地するブロック側の非貫通部のタイヤ幅方向の幅よりも小さくなるように非貫通部の端部を斜めに形成した
ことを特徴とする請求項1または2記載の空気入りタイヤ。
The tire rotation direction relative to the vehicle forward direction is specified,
Of the blocks adjacent to the non-penetrating part, the width in the tire width direction of the non-penetrating part on the block side that contacts the ground first in the vehicle advancing direction is larger than the width in the tire width direction of the non-penetrating part on the block side that contacts later. The pneumatic tire according to claim 1 or 2, wherein an end portion of the non-penetrating portion is formed obliquely so as to be small.
JP2007293308A 2007-11-12 2007-11-12 Pneumatic tire Pending JP2009119922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007293308A JP2009119922A (en) 2007-11-12 2007-11-12 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007293308A JP2009119922A (en) 2007-11-12 2007-11-12 Pneumatic tire

Publications (1)

Publication Number Publication Date
JP2009119922A true JP2009119922A (en) 2009-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017071302A (en) * 2015-10-07 2017-04-13 株式会社ブリヂストン tire
US10546690B2 (en) 2014-05-19 2020-01-28 Murata Manufacturing Co., Ltd. Method of manufacturing winding-type electronic component

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10546690B2 (en) 2014-05-19 2020-01-28 Murata Manufacturing Co., Ltd. Method of manufacturing winding-type electronic component
JP2017071302A (en) * 2015-10-07 2017-04-13 株式会社ブリヂストン tire

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