JP4141540B2 - Pneumatic tire - Google Patents
Pneumatic tire Download PDFInfo
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- JP4141540B2 JP4141540B2 JP22023398A JP22023398A JP4141540B2 JP 4141540 B2 JP4141540 B2 JP 4141540B2 JP 22023398 A JP22023398 A JP 22023398A JP 22023398 A JP22023398 A JP 22023398A JP 4141540 B2 JP4141540 B2 JP 4141540B2
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- Prior art keywords
- tire
- isosceles
- circumferential
- circumferential groove
- groove
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1384—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block corners
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は空気入りタイヤに関するもので、特に、タイヤ周方向に平行または実質的に平行に延びる少なくとも１本の周方向溝をタイヤの赤道線近傍に備えた、主として乗用車または軽トラックなどに使用される空気入りタイヤに関するものである。
【０００２】
【従来の技術】
一般的に言って、空気入りタイヤの運動性能に対してトレッド・パターンの及ぼす影響は大きなものであって、特に、優れた運動性能の空気入りタイヤを得るためには、タイヤの赤道線近傍の剛性が高いトレッド・パターンが強く求められる。
そこで、本発明が対象とする空気入りタイヤ、すなわち、タイヤの周方向に平行または実質的に平行に延びる、少なくとも１本の周方向溝をタイヤの赤道線近傍に備えた空気入りタイヤでは、従来、この周方向溝に開口するような横方向溝を配置することを避ける設計手法が採用されている。換言すれば、周方向に連続して延びるリブをセンター部の周方向主溝に隣接して配置し、タイヤの赤道線近傍の剛性を確保しているわけである。
【０００３】
【発明が解決しようとする課題】
しかしながら、タイヤの周方向に平行または実質的に平行に延びる、少なくとも１本の周方向溝をタイヤの赤道線近傍に備えた空気入りタイヤで、優れた運動性能を確保するために、上記のように、この周方向主溝に隣接して周方向に連続して延びるリブを配置すると、接地面内で周方向主溝以外に空気の逃げ場がないために、気柱管共鳴を起こしてタイヤの騒音（パターン・ノイズ）レベルが悪化するという不具合が生じる。
【０００４】
本発明の目的は、タイヤの周方向に平行または実質的に平行に延びる、少なくとも１本の周方向溝をタイヤの赤道線近傍に備えた空気入りタイヤにおいて、上記のような従来技術の不具合を解消して、運動性能を低下することなく、タイヤの騒音（パターン・ノイズ）レベルの悪化を防止または抑制した空気入りタイヤを提供することである。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、本発明の空気入りタイヤは、タイヤ周方向に平行または実質的に平行に延びる、少なくとも１本の周方向溝をタイヤの赤道線近傍に備えた空気入りタイヤにおいて、（１）該周方向溝に隣接して、二等辺またはほぼ二等辺の三角形領域が、周方向に間隔を置いて多数形成され、（２）該二等辺三角形領域の頂点および二等辺のうちの一つの辺が該周方向溝の溝壁上に位置し、（３）該二等辺三角形領域の頂点から底辺に向けて、面取り深さが徐々に浅くなるように、５ｍｍ以上の長さにわたって面取りされていて、（４）該二等辺三角形領域の頂点の頂角は５乃至４０度であり、（５）該周方向溝に開口し周方向に傾斜した方向に延びる多数の傾斜サイプが周方向に間隔を置いて配置され、該周方向溝と該傾斜サイプとによって該二等辺三角形領域が形成され、該二等辺三角形領域の二等辺のうちの他方の辺が該傾斜サイプ上に位置していることを特徴とするトレッド・パターンを備えた空気入りタイヤである。
【０００６】
上記の目的を達成するために、本発明の空気入りタイヤでは、
該周方向溝は２ｍｍ以上の溝幅を有すること、および／または
該二等辺三角形領域の頂点が該周方向溝の溝底のレベルに位置すること、
が好ましい。
【０００７】
上記の目的を達成するために、本発明の空気入りタイヤでは、
該二等辺三角形領域が曲面状に面取りされていてもよいが平面状に面取りされていてもよい。
【０００８】
上記目的を達成するために、本発明の空気入りタイヤでは、該傾斜サイプは、周方向に対して傾斜して延びる部分のタイヤ赤道面に近い側が先に接地して、赤道面に遠い側が後に接地するように、車両に装着する際のタイヤの回転（正転）方向が指定されている、いわゆる方向性トレッド・パターンが形成される方向性傾斜サイプであることが好ましい。
【０００９】
本明細書において、「方向性傾斜サイプ」とは、周方向に対して傾斜して延びるサイプであって、該サイプの傾斜して延びる部分のタイヤ赤道面に近い側が先に接地して、赤道面に遠い側が後に接地するように車両に装着する際のタイヤの回転（正転）方向が指定されている、いわゆる方向性トレッド・パターンが形成される方向性サイプを意味する。
【００１０】
上記目的を達成するために、本発明の空気入りタイヤでは、
該周方向溝、該傾斜サイプおよび該二等辺三角形領域などによって形成されるトレッド・パターンが、タイヤの赤道線上の点に関して点対称のトレッド・パターンであること、および／または
該周方向溝に隣接し、該二等辺三角形領域が形成されている陸部が、実質的に周方向連続性を損なわない周方向リブであること
が好ましい。
【００１１】
前述のように、本発明が対象にする空気入りタイヤ、すなわち、タイヤの周方向に平行または実質的に平行に延びる、少なくとも１本の周方向溝をタイヤの赤道線近傍に備えた空気入りタイヤでは、優れた運動性能を確保するために周方向主溝に隣接して周方向に連続して延びるリブを配置すると、接地面内で周方向主溝以外に空気の逃げ場がないために、気柱管共鳴を起こしてタイヤの騒音（パターン・ノイズ）レベルが悪化するという不具合が生じる。本発明の空気入りタイヤは上記のような構成であり、特に、（１）該周方向溝に隣接して、二等辺またはほぼ二等辺の三角形領域が、周方向に間隔を置いて多数形成され、（２）該二等辺三角形領域の頂点および二等辺のうちの一つの辺が該周方向溝の溝壁上に位置し、（３）該二等辺三角形領域の頂点から底辺に向けて、面取り深さが徐々に浅くなるように、少なくとも５ｍｍ以上の長さにわたって面取りされていて、（４）該二等辺三角形領域の頂点の頂角は５乃至４０度であり、（５）該周方向溝に開口し周方向に傾斜した方向に延びる多数の傾斜サイプが周方向に間隔を置いて配置され、該周方向溝と該傾斜サイプとによって該二等辺三角形領域が形成され、該二等辺三角形領域の二等辺のうちの他方の辺が該傾斜サイプ上に位置しているので、嘴状の切り欠きすなわち面取りされた二等辺三角形領域の切り欠きが周方向溝に隣接して周方向に間隔を置いて多数形成されていることになり、その結果、この嘴状の切り欠きによって気柱管共鳴の発生を押さえ、同時に、空気の逃げ道が作られるので、音圧が低下して、タイヤの騒音（パターン・ノイズ）レベルの悪化が防止または抑制される。
【００１２】
【発明の実施の形態】
以下、図面を参照しながら、本発明に基づく実施例のタイヤ、比較例のタイヤおよび従来例のタイヤについて説明する。タイヤ・サイズは、いずれも、１８５／７０ Ｒ１４である。
【００１３】
図１は、本発明に基づく実施例のタイヤのトレッド・パターンの一部を示す図面である。
図１に示す本発明に基づく実施例のタイヤは、タイヤ周方向に平行に延びる周方向リブ１を挟んで、同じくタイヤ周方向に平行に延びる左右一対の周方向溝２をタイヤの赤道線Ｅ近傍に備え、周方向溝２に隣接して、二等辺の三角形領域３が、周方向に間隔を置いて多数形成され、この二等辺三角形領域３の頂点３１および二等辺のうちの一つの辺が該周方向溝２の溝壁上に位置し、Ａ−Ａ断面図に示すように二等辺三角形領域３の頂点から底辺に向けて、面取り深さが徐々に浅くなるように約１５ｍｍの長さＬにわたって面取りされていて、二等辺三角形領域３の頂点３１の頂角θは約２０度である。
周方向溝２の溝幅は約７ｍｍである。二等辺三角形領域３の頂点３１が周方向溝２の溝底のレベルの約８０％に位置している。
Ａ−Ａ断面図に示すように、この二等辺三角形領域３は曲面状に面取りされている。
【００１４】
従来例のタイヤは、二等辺三角形領域３を備えていないことおよび周方向溝２の外側に隣接して周方向に連続して延びるリブが配置された、リブ・タイプのトレッド・パターンを備えていることを除いて、上記実施例のタイヤとほぼ同じタイヤである。
【００１５】
比較例のタイヤは、二等辺三角形領域３を備えていないことおよび周方向溝２に開口する横方向溝が多数配置された、ブロック・タイプのトレッド・パターンを備えていることを除いて、上記実施例のタイヤとほぼ同じタイヤである。
【００１６】
本発明に基づく上記実施例のタイヤ、上記比較例のタイヤおよび上記従来例のタイヤについて、タイヤの運動性能およびタイヤの騒音性能の評価試験を実施した。
【００１７】
タイヤの運動性能の評価試験は、乾燥した路面での操縦安定性能の評価試験であって、乾燥した状態のサーキット・コースを各種走行モードによりスポーツ走行したときのテスト・ドライバーによるフィーリングで１０点満点で評価したものである。
上記の運動性能の評価試験の結果では、上記従来例のタイヤが６．０で、上記実施例のタイヤが６．０で、上記比較例のタイヤが５．５であった。
【００１８】
タイヤの騒音性能の評価試験は、タイヤの騒音性能は、室内でタイヤ単体を回転するドラムの上に荷重をかけて押し付け、８０ｋｍ／ｈの速度におけるタイヤの騒音を測定するものである。
上記の騒音性能の評価試験の結果では、上記従来例のタイヤの騒音レベルが７４ｄＢ（Ａ）で、上記実施例のタイヤの騒音レベルが７１ｄＢ（Ａ）で、上記比較例のタイヤの騒音レベルが６９ｄＢ（Ａ）であった。
【００１９】
上記の評価試験の結果を表１に示す。
【００２０】
【表１】
【発明の効果】
上記の結果から、本発明によって、運動性能を低下することなく騒音性能に優れた空気入りタイヤが得られることことがわかる。
【図面の簡単な説明】
【図１】本発明によるタイヤのトレッド・パターンの一部拡大正面図である。
【符号の説明】
１ 周方向リブ
２ 周方向溝
３ 二等辺三角形領域[0001]
[Industrial application fields]
The present invention relates to a pneumatic tire, and in particular, is mainly used for a passenger car or a light truck provided with at least one circumferential groove extending in the vicinity of the equator line of the tire in parallel or substantially parallel to the tire circumferential direction. This relates to a pneumatic tire.
[0002]
[Prior art]
Generally speaking, the tread pattern has a great influence on the dynamic performance of pneumatic tires. Especially, in order to obtain pneumatic tires with excellent dynamic performance, A highly rigid tread pattern is strongly demanded.
Therefore, in a pneumatic tire targeted by the present invention, that is, a pneumatic tire provided with at least one circumferential groove in the vicinity of the equator line of the tire that extends parallel or substantially parallel to the circumferential direction of the tire. A design technique is employed to avoid disposing a lateral groove that opens in the circumferential groove. In other words, ribs extending continuously in the circumferential direction are arranged adjacent to the circumferential main groove of the center portion to ensure rigidity in the vicinity of the equator line of the tire.
[0003]
[Problems to be solved by the invention]
However, in order to ensure excellent exercise performance in a pneumatic tire provided with at least one circumferential groove extending in the vicinity of the equator line of the tire and extending in parallel or substantially parallel to the circumferential direction of the tire, as described above. In addition, when a rib extending continuously in the circumferential direction is disposed adjacent to the circumferential main groove, there is no air escape area other than the circumferential main groove within the ground contact surface. There is a problem that the noise (pattern noise) level deteriorates.
[0004]
It is an object of the present invention to provide a pneumatic tire having at least one circumferential groove in the vicinity of the equator line of the tire that extends parallel or substantially parallel to the circumferential direction of the tire. An object of the present invention is to provide a pneumatic tire that eliminates the problem and prevents or suppresses the deterioration of the tire noise (pattern noise) level without deteriorating the exercise performance.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the pneumatic tire of the present invention is a pneumatic tire provided with at least one circumferential groove in the vicinity of the equator line of the tire, extending in parallel or substantially parallel to the tire circumferential direction. (1) Adjacent to the circumferential groove, a large number of isosceles or substantially isosceles triangular regions are formed at intervals in the circumferential direction, and (2) of the vertices and isosceles of the isosceles triangular region One side is located on the groove wall of the circumferential groove, and (3) the chamfer extends over a length of 5 mm or more so that the chamfer depth gradually decreases from the apex to the base of the isosceles triangle region. (4) The apex angle of the apex of the isosceles triangle region is 5 to 40 degrees, and (5) a large number of inclined sipes that open in the circumferential groove and extend in the circumferentially inclined direction are circumferential. Spaced apart from each other, the circumferential groove and the inclined support The isosceles triangle region formed by the flop, a pneumatic tire having a tread pattern that the other side of the isosceles said isosceles triangle region is characterized by being located on the inclined sipes It is.
[0006]
In order to achieve the above object, in the pneumatic tire of the present invention,
The circumferential groove has a groove width of 2 mm or more and / or the apex of the isosceles triangular region is located at the level of the groove bottom of the circumferential groove;
Is preferred.
[0007]
In order to achieve the above object, in the pneumatic tire of the present invention,
The isosceles triangular region may be chamfered in a curved surface shape, or may be chamfered in a flat shape.
[0008]
In order to achieve the above object, in the pneumatic tire according to the present invention , the inclined sipe is configured such that the side closer to the tire equatorial plane of the portion extending inclined with respect to the circumferential direction is grounded first, and the side farther from the equatorial plane is later. A directional inclined sipe in which a so-called directional tread pattern is formed in which the rotation (forward rotation) direction of the tire when mounted on the vehicle is designated so as to be in contact with the ground.
[0009]
In the present specification, the “directional inclined sipe” is a sipe extending inclined with respect to the circumferential direction, and a side near the tire equatorial plane of the inclined extending portion of the sipe is grounded first, and the equator. This means a directional sipe in which a so-called directional tread pattern is formed, in which the direction of rotation (forward rotation) of the tire is specified when the vehicle is mounted so that the side far from the surface is grounded later.
[0010]
In order to achieve the above object, in the pneumatic tire of the present invention,
The tread pattern formed by the circumferential groove, the inclined sipe and the isosceles triangular region is a tread pattern that is point-symmetric with respect to a point on the tire equator line and / or is adjacent to the circumferential groove. And it is preferable that the land part in which this isosceles triangle area | region is formed is the circumferential direction rib which does not impair circumferential direction continuity substantially.
[0011]
As described above, a pneumatic tire targeted by the present invention, that is, a pneumatic tire provided with at least one circumferential groove in the vicinity of the equator line of the tire that extends parallel or substantially parallel to the circumferential direction of the tire. Then, in order to ensure excellent motion performance, if a rib extending continuously in the circumferential direction is arranged adjacent to the circumferential main groove, there is no air escape space other than the circumferential main groove in the ground plane, There arises a problem that the noise (pattern noise) level of the tire deteriorates due to column tube resonance. The pneumatic tire of the present invention is configured as described above. In particular, (1) a large number of isosceles or substantially isosceles triangular regions are formed at intervals in the circumferential direction adjacent to the circumferential groove. (2) the vertex of the isosceles triangle region and one of the isosceles sides are located on the groove wall of the circumferential groove, and (3) chamfering from the vertex of the isosceles triangle region toward the bottom. as depth becomes gradually shallower, it has been chamfered over a length of more than at least 5 mm, (4) the apex angle of the apex of the isosceles triangle region Ri 5 to 40 degrees der, (5) the circumferential direction A large number of inclined sipes opening in the groove and extending in the direction inclined in the circumferential direction are arranged at intervals in the circumferential direction, and the isosceles triangle region is formed by the circumferential groove and the inclined sipes, and the isosceles triangle The other side of the isosceles of the region is located on the inclined sipe There Runode, will be notched beak shaped notch i.e. chamfered isosceles triangle regions are formed a large number at intervals in the circumferential direction adjacent to the circumferential groove such that the beak The occurrence of air columnar resonance is suppressed by the notch, and at the same time, an air escape passage is created, so that the sound pressure is reduced and the deterioration of the tire noise (pattern noise) level is prevented or suppressed.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, tires of examples, comparative examples, and conventional tires according to the present invention will be described with reference to the drawings. Both tire sizes are 185/70 R14.
[0013]
FIG. 1 is a view showing a part of a tread pattern of a tire according to an embodiment of the present invention.
The tire of the embodiment according to the present invention shown in FIG. 1 has a pair of left and right
The groove width of the
As shown in the AA sectional view, the isosceles
[0014]
The tire of the conventional example is provided with a rib-type tread pattern in which the isosceles
[0015]
The tire of the comparative example is not provided with the
[0016]
The tires of the above examples, the comparative examples, and the conventional tires according to the present invention were subjected to evaluation tests of tire movement performance and tire noise performance.
[0017]
The tire movement performance evaluation test is an evaluation test of steering stability performance on a dry road surface, and 10 points are given by the test driver when driving on a dry circuit course in various driving modes. It was evaluated with a perfect score.
As a result of the above-mentioned evaluation test of the kinematic performance, the tire of the above conventional example was 6.0, the tire of the above example was 6.0, and the tire of the above comparative example was 5.5.
[0018]
In the evaluation test of the tire noise performance, the tire noise performance is measured by measuring the tire noise at a speed of 80 km / h by pressing a load on a drum that rotates a single tire in a room.
As a result of the noise performance evaluation test, the noise level of the tire of the conventional example is 74 dB (A), the noise level of the tire of the example is 71 dB (A), and the noise level of the tire of the comparative example is It was 69 dB (A).
[0019]
The results of the evaluation test are shown in Table 1.
[0020]
[Table 1]
【The invention's effect】
From the above results, it can be seen that the present invention can provide a pneumatic tire excellent in noise performance without deteriorating exercise performance.
[Brief description of the drawings]
FIG. 1 is a partially enlarged front view of a tread pattern of a tire according to the present invention.
[Explanation of symbols]
1
Claims (8)
（１）該周方向溝に隣接して、二等辺またはほぼ二等辺の三角形領域が、周方向に間隔を置いて多数形成され、
（２）該二等辺三角形領域の頂点および二等辺のうちの一つの辺が該周方向溝の溝壁上に位置し、
（３）該二等辺三角形領域の頂点から底辺に向けて、面取り深さが徐々に浅くなるように、５ｍｍ以上の長さにわたって面取りされていて、
（４）該二等辺三角形領域の頂点の頂角は５乃至４０度であることを特徴とするトレッド・パターンを備え、
（５）該周方向溝に開口し周方向に傾斜した方向に延びる多数の傾斜サイプが周方向に間隔を置いて配置され、該周方向溝と該傾斜サイプとによって該二等辺三角形領域が形成され、該二等辺三角形領域の二等辺のうちの他方の辺が該傾斜サイプ上に位置していることを特徴とする空気入りタイヤ。In a pneumatic tire provided with at least one circumferential groove in the vicinity of the equator line of the tire, extending parallel or substantially parallel to the tire circumferential direction,
(1) Adjacent to the circumferential groove, a large number of isosceles or substantially isosceles triangular regions are formed at intervals in the circumferential direction;
(2) The vertex of the isosceles triangle region and one of the isosceles sides are located on the groove wall of the circumferential groove,
(3) The chamfer is chamfered over a length of 5 mm or more so that the chamfer depth gradually decreases from the apex to the base of the isosceles triangle region,
(4) A tread pattern characterized in that the apex angle of the vertex of the isosceles triangle region is 5 to 40 degrees ,
(5) A large number of inclined sipes opening in the circumferential groove and extending in a direction inclined in the circumferential direction are arranged at intervals in the circumferential direction, and the isosceles triangular region is formed by the circumferential groove and the inclined sipes. A pneumatic tire characterized in that the other of the isosceles sides of the isosceles triangular region is located on the inclined sipe .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22023398A JP4141540B2 (en) | 1998-08-04 | 1998-08-04 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22023398A JP4141540B2 (en) | 1998-08-04 | 1998-08-04 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000052715A JP2000052715A (en) | 2000-02-22 |
| JP4141540B2 true JP4141540B2 (en) | 2008-08-27 |
Family
ID=16747982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22023398A Expired - Fee Related JP4141540B2 (en) | 1998-08-04 | 1998-08-04 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4141540B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636802A (en) * | 2013-10-22 | 2016-06-01 | 住友橡胶工业株式会社 | Pneumatic tire |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002240513A (en) * | 2001-02-20 | 2002-08-28 | Bridgestone Corp | Pneumatic tire |
| JP4615969B2 (en) * | 2004-11-24 | 2011-01-19 | 株式会社ブリヂストン | Pneumatic tire |
| JP4925660B2 (en) * | 2005-12-21 | 2012-05-09 | 株式会社ブリヂストン | tire |
| JP5167982B2 (en) * | 2008-06-24 | 2013-03-21 | 横浜ゴム株式会社 | Pneumatic tire |
| JP5923125B2 (en) * | 2014-02-14 | 2016-05-24 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP6725009B2 (en) * | 2017-11-20 | 2020-07-15 | 横浜ゴム株式会社 | Pneumatic tire |
-
1998
- 1998-08-04 JP JP22023398A patent/JP4141540B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636802A (en) * | 2013-10-22 | 2016-06-01 | 住友橡胶工业株式会社 | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000052715A (en) | 2000-02-22 |
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