JP4684059B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP4684059B2
JP4684059B2 JP2005272439A JP2005272439A JP4684059B2 JP 4684059 B2 JP4684059 B2 JP 4684059B2 JP 2005272439 A JP2005272439 A JP 2005272439A JP 2005272439 A JP2005272439 A JP 2005272439A JP 4684059 B2 JP4684059 B2 JP 4684059B2
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row
land
land portion
pitches
pneumatic tire
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JP2007083771A (en
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一人 藤田
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Bridgestone Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03Tread patterns
    • B60C11/0318Tread patterns irregular patterns with particular pitch sequence

Description

本発明は、周方向の主溝によってトレッド面に複数の陸部列を形成し、幅方向の副溝によってこれらの陸部列に所望のピッチで陸部(ブロック)を形成した空気入りタイヤに関する。   The present invention relates to a pneumatic tire in which a plurality of land portion rows are formed on a tread surface by a main groove in the circumferential direction, and land portions (blocks) are formed at a desired pitch in these land portion rows by sub grooves in the width direction. .

下記の各特許文献には空気入りタイヤが記載されている。   Each of the following patent documents describes a pneumatic tire.

また、図5は従来の空気入りタイヤのトレッドパターン501を示している。このトレッドパターン501では、周方向の4本の主溝503によって陸部列01、陸部列02、陸部列03、陸部列04、陸列部05を形成し、各陸部列01,02,03,04,05に幅方向の副溝505によって同数のブロック507が形成され、同数のピッチ個数64が与えられている。   FIG. 5 shows a tread pattern 501 of a conventional pneumatic tire. In this tread pattern 501, a land portion row 01, a land portion row 02, a land portion row 03, a land portion row 04, and a land row portion 05 are formed by four circumferential main grooves 503, and each land portion row 01, The same number of blocks 507 are formed in the sub-grooves 505 in the width direction in 02, 03, 04, and 05, and the same number of pitches 64 is given.

従来の空気入りタイヤでは、主に騒音(パターンノイズ)の低減を目的として上記のようにタイヤの周上に配列される多数のブロック507(陸部)の繰り返し単位であるピッチ個数を変化させる(所定の個数に選定する)ことにより、騒音を分散させ、低減させている。   In a conventional pneumatic tire, the number of pitches, which is a repeating unit of a large number of blocks 507 (land portions) arranged on the circumference of the tire as described above, is mainly changed for the purpose of reducing noise (pattern noise) ( By selecting a predetermined number, noise is dispersed and reduced.

また、操縦性と安定性(操縦安定性)に関しては、中心の陸部列(上記の場合は陸部列03)におけるリブ列またはブロック列の剛性を高めるように設計し、騒音の低減効果に加えて、高い操縦安定性を実現させようとしている。
特開昭59−140104号公報 特開昭63−61608号公報 特開昭63−159110号公報
In addition, with regard to maneuverability and stability (steering stability), it is designed to increase the rigidity of the rib row or the block row in the central land row (land portion row 03 in the above case) to reduce noise. In addition, it is trying to achieve high handling stability.
JP 59-140104 JP JP 63-61608 JP JP 63-159110 JP

ところが、ブロックのピッチ個数選定と剛性強化によって騒音を低減させ操縦安定性を向上させる上記の手法には限界があり、騒音低減に重きを置けば操縦安定性が損なわれ、操縦安定性に重きを置けば騒音が増加する。   However, there is a limit to the above-mentioned method of reducing noise and improving steering stability by selecting the number of block pitches and strengthening the rigidity.If the emphasis is on noise reduction, steering stability will be impaired, and steering stability will be emphasized. If placed, noise will increase.

本発明は、上記のような従来の課題に鑑みて成されたものであり、低騒音(パターンノイズ)と優れた操縦安定性とを両立させた空気入りタイヤの提供を目的としている。   The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a pneumatic tire that achieves both low noise (pattern noise) and excellent steering stability.

請求項1の発明は、前輪、または、後輪の少なくとも一方のキャンバー角度設定がネガティブ角度であるサスペンションを備えた車両の前記ネガティブキャンバーサスペンションに装着され、前記車両に対する装着方向が決められており、トレッド面にタイヤ周方向に延びる複数の主溝を設け、前記主溝によってタイヤ幅方向に総数が5である複数の陸部列を区画形成し、これらの陸部列にタイヤ幅方向に延びる副溝またはサイプをタイヤ周方向に沿って所定のピッチで配置した空気入りタイヤにおいて、前記副溝またはサイプによって区分したピッチ数を各陸部列で相違させ、陸部列を車両装着内側から順に陸部列1、陸部列2……陸部列5としたときの各陸部列におけるピッチ個数を、陸部列3>陸部列2>陸部列4>陸部列1>陸部列5としたことを特徴とする。 The invention of claim 1 is mounted on the negative camber suspension of a vehicle having a suspension in which the camber angle setting of at least one of the front wheels or the rear wheels is a negative angle, and the mounting direction with respect to the vehicle is determined, A plurality of main grooves extending in the tire circumferential direction are provided on the tread surface, and a plurality of land portion rows having a total number of 5 in the tire width direction are defined by the main grooves, and sub-portions extending in the tire width direction are formed in these land portion rows. In a pneumatic tire in which grooves or sipes are arranged at a predetermined pitch along the tire circumferential direction, the number of pitches divided by the sub-grooves or sipes is made different for each land portion row, and the land portion row is landed in order from the inside of the vehicle. part column 1, the pitch number in each land row when the land row 2 ...... land row 5, land row 3> land row 2> land row 4> land row 1> land row And said that the content was.

請求項2の発明は、請求項1に記載された空気入りタイヤであって、各陸部列での陸部のピッチを、ランダム配列にしたことを特徴とする。   The invention according to claim 2 is the pneumatic tire according to claim 1, characterized in that the pitch of the land portions in each land portion row is a random array.

請求項3の発明は、請求項1又は請求項2に記載された空気入りタイヤであって、ピッチ個数を最小にした陸部列に対し、他の陸部列のピッチ個数を、前記最小のピッチ個数より2箇以上とし、且つ、2倍未満にしたことを特徴とする。 The invention according to claim 3 is the pneumatic tire according to claim 1 or claim 2 , wherein the number of pitches of the other land portion rows is set to the minimum value with respect to the land portion row having the smallest number of pitches. The number of pitches is two or more and less than twice.

発明の作用及び効果Effects and effects of the invention

本発明の空気入りタイヤは、タイヤの周方向に形成される各陸部列においてブロック(陸部)配列の繰り返し単位であるピッチ個数を変化させる(所望のピッチ個数を選定する)ことによって騒音を分散し低減させながら、下記のように、ピッチ個数が大きい程タイヤ(トレッド部又はベルト部)の曲げ剛性が小さくなるという事実(知見)に基づいて、トレッドの幅方向に形成した3、4、5または6列の陸部列の中央部側の陸部列での陸部(ブロック)のピッチ個数を、端部側の陸部列でのピッチ個数より大きく設定し、剛性を適度に下げることにより、下記のように、コーナリング走行時(旋回走行時)の操縦安定性を向上させている。   In the pneumatic tire according to the present invention, noise is generated by changing the number of pitches (repeating a desired number of pitches) which is a repeating unit of a block (land portion) arrangement in each land portion row formed in the circumferential direction of the tire. Based on the fact (knowledge) that the bending stiffness of the tire (tread part or belt part) becomes smaller as the number of pitches becomes larger as described below while being dispersed and reduced, 3, 4, Set the number of land (block) pitches in the land part row on the center side of the land part row of 5 or 6 rows larger than the number of pitches in the land part row on the end side, and reduce the rigidity moderately. As a result, the steering stability during cornering (turning) is improved as described below.

周知のように、車両がコーナリング走行するときは、タイヤのスリップ角の大小に拘わらず、コーナリングフォースFが大きい程操縦安定性は高くなる。   As is well known, when the vehicle is cornering, the steering stability increases as the cornering force F increases, regardless of the tire slip angle.

(A)緩カーブでのコーナリングのように、直進状態から僅かにハンドルを切ったとき、例えば、1レーン程度のレーン変更をするときのように、タイヤのスリップ角が小さくコーナリングフォースが線形に変化する線形変化領域のコーナリング走行時は、
コーナリングフォースF=(ベルト部またはトレッド部の剛性)×(接地長)×(接地長)で与えられ、
(B)急カーブでのコーナリング時のように、タイヤのスリップ角が大きいコーナリング走行時は、
コーナリングフォースF=μ×接地面積×接地圧で与えられる。(μはトレッド面と路面の間の摩擦係数)
このように、大きなコーナリングフォースFを得るには、タイヤのトレッド部やベルト部の剛性、タイヤの接地長、摩擦係数μ、接地面積、接地圧などが支配要因になる。
(A) When turning the steering wheel slightly from the straight state, such as cornering on a gentle curve, for example, when changing the lane by about one lane, the tire slip angle is small and the cornering force changes linearly. When cornering in the linear change area
Cornering force F = (Rigidity of belt portion or tread portion) × (contact length) × (contact length)
(B) When cornering with a large tire slip angle, such as when cornering on a sharp curve,
Cornering force F = μ × ground area × ground pressure. (Μ is the coefficient of friction between the tread surface and the road surface)
Thus, in order to obtain a large cornering force F, the rigidity of the tire tread and belt, the contact length of the tire, the friction coefficient μ, the contact area, the contact pressure, and the like become the controlling factors.

次に、図3と図4によってコーナリング走行時のタイヤ接地形状の変化と、そのとき得られるコーナリングフォースFとの関係を説明する。   Next, the relationship between the change in the tire ground contact shape during cornering traveling and the cornering force F obtained at that time will be described with reference to FIGS.

図3は、タイヤのスリップ角が小さいコーナリング走行時(上記のAに相当する)の接地形状を示しており、この接地形状は、タイヤのセンター部で接地長がやや長く(長さL1)なっている。   FIG. 3 shows a ground contact shape during cornering traveling with a small tire slip angle (corresponding to A above). This ground contact shape has a slightly longer contact length (length L1) at the center of the tire. ing.

上記のように、上記(A)の場合のコーナリングフォースFに対しては二乗で影響する接地長が支配的であり、接地長が僅かに長くなってもそれだけ大きなコーナリングフォースFが得られ、1レーン程度のレーン変更時はレーンチェンジ性(操縦安定性)が大きく向上する。   As described above, the cornering force F in the case of the above (A) is dominated by the ground contact length that is influenced by the square, and even when the ground contact length is slightly increased, a cornering force F that is larger is obtained. When changing lanes, the lane changeability (steering stability) is greatly improved.

また、タイヤの接地長は剛性を下げると長くなるから、センター部での接地長は、この部分でタイヤトレッド部を周方向に曲げる剛性(周方向面外曲げ剛性:周方向曲げ変形図)を適度に下げると、スリップ角が小さいコーナリング走行時において大きなコーナリングフォースFが得られるから、操縦安定性やレーンチェンジ性を向上させるために大きな効果がある。   In addition, since the ground contact length of the tire becomes longer when the rigidity is lowered, the ground contact length at the center portion is the rigidity that bends the tire tread portion in the circumferential direction at this portion (circumferential bending curvature in the circumferential direction: circumferential bending deformation diagram). When it is lowered appropriately, a large cornering force F can be obtained during cornering traveling with a small slip angle, and therefore, there is a great effect in improving steering stability and lane changeability.

図4は、タイヤのスリップ角が大きい急コーナリング走行時(上記のBに相当する)の接地形状を示しており、この場合、接地形状はオムスビ状の三角形になっている。   FIG. 4 shows a ground contact shape at the time of sharp cornering traveling (corresponding to B described above) with a large tire slip angle. In this case, the ground contact shape is an Omusubi triangle.

上記のように、(B)の場合のコーナリングフォースFは摩擦係数μと接地圧が大きく、また、接地面積が広い程大きなコーナリングフォースFが得られ、急カーブや限界走行時の車両挙動安定性が向上する。   As described above, the cornering force F in the case of (B) has a larger coefficient of friction μ and a contact pressure, and a larger cornering force F is obtained as the contact area is larger. Will improve.

また、接地面の幅方向外側ではコーナリングフォースFによる曲げ入力や圧縮入力によって接地圧が大きく減少するバックリング変形が生じるから、幅方向外側では陸部列の剛性が高い程このような変形が少なくなり、大きなコーナリングフォースFが得られる。   In addition, buckling deformation in which the ground pressure is greatly reduced by bending input or compression input by the cornering force F occurs on the outer side in the width direction of the ground contact surface. Thus, a large cornering force F is obtained.

そこで、請求項1の空気入りタイヤは、トレッド面に幅方向に形成した3、4、5または6列の陸部列において、ピッチ個数を、
陸部列2>陸部列1=陸部列3 (N=3の場合)
陸部列2=陸部列3>陸部列1=陸部列4 (N=4の場合)
陸部列3>陸部列2=陸部列4>陸部列1=陸部列5(N=5の場合)
陸部列3=陸部列4>陸部列2=陸部列5>陸部列1=陸部列6
(N=6の場合)
としており、このように、中央部側の陸部列で陸部のピッチ個数を大きくし、端部側の陸部列で陸部のピッチ個数をそれより小さくしたことによって騒音を分散させ、低減させており、さらに、中央部側の陸部列はピッチ個数を大きくすることによって剛性を適度に下げており、端部側の他の陸部列はピッチ個数を小さくすることによって剛性をそれより上げている。
Therefore, in the pneumatic tire of claim 1, the number of pitches in the 3, 4, 5, or 6 land portion rows formed in the width direction on the tread surface
Land part row 2> Land part row 1 = Land part row 3 (when N = 3)
Land part row 2 = Land part row 3> Land part row 1 = Land part row 4 (when N = 4)
Land part row 3> Land part row 2 = Land part row 4> Land part row 1 = Land part row 5 (when N = 5)
Land part row 3 = Land part row 4> Land part row 2 = Land part row 5> Land part row 1 = Land part row 6
(N = 6)
In this way, noise is distributed and reduced by increasing the number of land part pitches in the central part of the land part row and decreasing the number of land part pitch numbers in the end part side land part row. Furthermore, the rigidity of the land portion row on the center side is appropriately lowered by increasing the number of pitches, and the rigidity of the other land portion rows on the end side is reduced by reducing the number of pitches. Raised.

その結果、トレッドのセンター部が主に接地する緩いコーナリング走行時は、中央部側で陸部列の剛性を下げたことにより、トレッドの接地長が長くなって大きなコーナリングフォースFが得られ、操縦安定性やレーンチェンジ性が向上する。   As a result, at the time of loose cornering where the center of the tread is mainly grounded, the ground contact length of the tread is increased and the large cornering force F is obtained by reducing the rigidity of the land section row at the center. Stability and lane change are improved.

また、端部側の陸部列が接地する急カーブのコーナリング時は、端部側陸部列の剛性を大きくしたことにより、曲げ入力や圧縮入力によって接地圧が減少するバックリング変形が軽減されて大きなコーナリングフォースFが得られ、急カーブや限界走行時の車両挙動安定性が向上する。   Also, during cornering of sharp curves where the land part row on the end side contacts the ground, buckling deformation that reduces the contact pressure due to bending input or compression input is reduced by increasing the rigidity of the end side land portion row. A large cornering force F can be obtained, and the vehicle behavior stability at the time of a sharp curve and limit driving is improved.

請求項2の空気入りタイヤは、請求項1の構成と同等の効果が得られる。   The pneumatic tire of claim 2 can achieve the same effect as the structure of claim 1.

また、請求項2の構成は、各陸部列における陸部のピッチが互いにランダムになるように配列されている。   Moreover, the structure of Claim 2 is arranged so that the pitch of the land part in each land part row | line | column becomes mutually random.

各陸部列において陸部を形成する副溝(サイプ)がタイヤの幅方向に一直線に揃うと、この部分でのパターンノイズが大きくなるが、請求項2の構成では副溝(サイプ)をタイヤの幅方向に揃はないようにランダム配列したことにより、大きなパターンノイズの発生を防止し、騒音低減効果をさらに向上させている。   If the sub-grooves (sipes) forming the land portions in each land portion row are aligned in a straight line in the width direction of the tire, pattern noise at this portion increases. By arranging them randomly so that they are not aligned in the width direction, generation of large pattern noise is prevented, and the noise reduction effect is further improved.

請求項3の空気入りタイヤは、キャンバー角度がネガティブに設定されたサスペンション(車両の前後から見てタイヤをハの字型に傾斜して取り付ける設定のサスペンション)に装着される空気入りタイヤであって、トレッド面に幅方向に形成した3、4、5または6列の陸部列において、ピッチ個数を、
陸部列2>陸部列1>陸部列3 (N=3の場合)
陸部列2>陸部列3>陸部列1>陸部列4 (N=4の場合)
陸部列3>陸部列2>陸部列4>陸部列1>陸部列5(N=5の場合)
陸部列3>陸部列4>陸部2列>陸部列5>陸部列1>陸部列6
(N=6の場合)
としており、このように、陸部のピッチ個数を、中央部側の陸部列で最も大きくし、端部側に配列される陸部列程小さくしたことにより、請求項1の構成と同様に、騒音を分散させ、低減させており、さらに、中央部側の陸部列はピッチ個数を大きくすることによって剛性を適度に下げ、他の陸部列は、端部側の陸部列程ピッチ個数を小さくして剛性を徐々に上げると共に、車両内側の陸部列では外側の陸部列より剛性が小さくなるようにしている。
The pneumatic tire according to claim 3 is a pneumatic tire to be mounted on a suspension in which the camber angle is set to be negative (a suspension in which the tire is mounted in a C-shape when viewed from the front and rear of the vehicle). In the land portion row of 3, 4, 5 or 6 rows formed in the width direction on the tread surface,
Land part row 2> Land part row 1> Land part row 3 (when N = 3)
Land part row 2> Land part row 3> Land part row 1> Land part row 4 (when N = 4)
Land part row 3> Land part row 2> Land part row 4> Land part row 1> Land part row 5 (when N = 5)
Land part row 3> Land part row 4> Land portion 2 row> Land portion row 5> Land portion row 1> Land portion row 6
(N = 6)
As described above, the number of land pitches is maximized in the land portion row on the center side and smaller in the land portion row arranged on the end side, so that the same as in the configuration of claim 1. In addition, the noise is dispersed and reduced, and the rigidity of the land portion row on the center side is appropriately lowered by increasing the number of pitches, and the other land portion rows are pitched as much as the land portion row on the end side. The rigidity is gradually increased by decreasing the number, and the rigidity in the land portion row on the inner side of the vehicle is smaller than that in the outer land portion row.

その結果、トレッドのセンター部付近が主に接地する緩いコーナリング走行時は、中央部側で陸部列の剛性を下げたことにより、トレッドの接地長が長くなって大きなコーナリングフォースFが得られ、操縦安定性やレーンチェンジ性が向上する。   As a result, at the time of loose cornering where the center portion of the tread is mainly grounded, the ground contact length of the tread is increased and the large cornering force F is obtained by reducing the rigidity of the land portion row on the center side. Steering stability and lane change are improved.

また、端部側の陸部列が接地する急カーブのコーナリング走行時は、端部側陸部列の剛性を大きくしたことにより、曲げ入力や圧縮入力によって接地圧が減少するバックリング変形が軽減されて大きなコーナリングフォースFが得られ、急カーブや限界走行時の車両挙動安定性が向上する。   In addition, during cornering of sharp curves where the land side row on the end side contacts the ground, buckling deformation that reduces the ground pressure due to bending input or compression input is reduced by increasing the rigidity of the end side land portion row As a result, a large cornering force F is obtained, and the vehicle behavior stability at the time of a sharp curve or limit driving is improved.

また、ネガティブキャンバー角のサスペンションに装着される請求項3の空気入りタイヤは、直進走行時には剛性が小さい内側の陸部列側が路面と接触するから、直進走行時と緩カーブ時にはトレッドの接地長がさらに長くなり、それだけ大きなコーナリングフォースFが得られ、操縦安定性やレーンチェンジ性がさらに向上する。   In the pneumatic tire of claim 3, which is mounted on a suspension having a negative camber angle, since the land side of the inner land where the rigidity is small is in contact with the road surface when traveling straight, the contact length of the tread is constant when traveling straight and when traveling slowly. The longer cornering force F is obtained, and the steering stability and lane changeability are further improved.

また、急カーブ時は、タイヤのバンプに伴うキャンバー角の変化にも影響されるが、急カーブ時の車重(荷重)移動によって、剛性が最も小さい中央の陸部列側に接地面が移動するから、剛性の低下に伴ってそれだけ接地面積が広くなり、広い接地面積と摩擦係数μとによってタイヤのグリップ力が大きくなるから、大きなコーナリングフォースFが得られ、急カーブや限界走行時の車両挙動安定性がさらに向上する。   Also, during sharp curves, it is affected by changes in camber angle due to tire bumps, but the ground contact surface moves to the central land row side where the rigidity is the smallest due to vehicle weight (load) movement during sharp curves Therefore, as the rigidity decreases, the ground contact area increases accordingly, and the gripping force of the tire increases due to the large ground contact area and the friction coefficient μ. Therefore, a large cornering force F can be obtained, and the vehicle at the time of a sharp curve or limit running The behavioral stability is further improved.

請求項4の空気入りタイヤは、請求項3の構成と同等の効果が得られる。   The pneumatic tire of claim 4 can achieve the same effect as the structure of claim 3.

また、請求項4の構成は、請求項2の構成と同様に、副溝(サイプ)がタイヤの幅方向に揃はないように各陸部列の陸部をランダム配列することにより、大きなパターンノイズの発生を防止し、騒音低減効果をさらに向上させている。   Further, the configuration of claim 4 is similar to the configuration of claim 2 in that the land portions of each land portion row are randomly arranged so that the sub-grooves (sipes) are not aligned in the tire width direction. The generation of noise is prevented and the noise reduction effect is further improved.

請求項5の発明は、請求項1〜請求項4の構成と同等の効果が得られる。   The invention according to claim 5 can achieve the same effects as the configurations of claims 1 to 4.

また、ピッチ個数が最小の陸部列に対して、他の陸部列のピッチ個数が2箇以上多く、また、2倍未満であると、各陸部列のピッチ数が実質的に同一になり、本発明の効果が薄くなる恐れがあるが、請求項5の構成では、ピッチ個数最小の陸部列に対して他の陸部列のピッチ個数をこの最小ピッチ個数より2箇多くし、且つ、2倍未満にしたことによって、本発明の上記のような効果が明確に得られる。   In addition, when the number of pitches of the other land portion rows is two or more and less than twice the number of pitches of the land portion row having the smallest number of pitches, the number of pitches of each land portion row is substantially the same. The effect of the present invention may be reduced, but in the configuration of claim 5, the number of pitches of the other land portion rows is increased by two from the minimum number of pitches with respect to the land portion row having the minimum number of pitches. And by making it less than 2 times, the above effects of the present invention can be clearly obtained.

第1実施形態First embodiment

図1と表1によって空気入りタイヤ101(本発明の第1実施形態)の説明をする。   A pneumatic tire 101 (first embodiment of the present invention) will be described with reference to FIG. 1 and Table 1.

[空気入りタイヤ101の特徴]
空気入りタイヤ101のトレッド面には、図1のように、タイヤの周方向に設けられた4本の主溝103によって陸部列1、陸部列2、陸部列3、陸部列4、陸部列5が形成されており、さらに、陸部列1、陸部列2、陸部列3、陸部列4、陸部列5では、それぞれ所定の間隔で配置されたタイヤ幅方向の副溝(サイプ)105,107,109,111,113によって陸部115,117,119,121,123がそれぞれ形成されている。
[Features of pneumatic tire 101]
On the tread surface of the pneumatic tire 101, as shown in FIG. 1, a land portion row 1, a land portion row 2, a land portion row 3, and a land portion row 4 are formed by four main grooves 103 provided in the circumferential direction of the tire. The land portion row 5 is formed, and the land portion row 1, the land portion row 2, the land portion row 3, the land portion row 4, and the land portion row 5 are respectively arranged in the tire width direction at predetermined intervals. Land portions 115, 117, 119, 121, and 123 are formed by sub-grooves (sipes) 105, 107, 109, 111, and 113, respectively.

各副溝105,107,109,111,113の間隔によって各陸部115,117,119,121,123のピッチ個数はそれぞれ、43、64、85、64、43に設定されており、このピッチ個数は請求項1の構成で、陸部列数N=5の場合の構成である陸部列3>陸部列2=陸部列4>陸部列1=陸部列5の条件を満たしている。   The pitch numbers of the land portions 115, 117, 119, 121, and 123 are set to 43, 64, 85, 64, and 43, respectively, depending on the interval between the sub grooves 105, 107, 109, 111, and 113. The number is the configuration according to claim 1 and satisfies the condition of land portion row 3> land portion row 2 = land portion row 4> land portion row 1 = land portion row 5 which is a constitution in the case where the number of land portion rows N = 5. ing.

このように、トレッドセンター125を通る陸部列3のピッチ個数85は、両脇の陸部列2,4のピッチ個数64より大きくされ、また、陸部列2,4のピッチ個数64は最外側の陸部列1,5のピッチ個数より大きくされており、各陸部列1、2,3,4,5の剛性はそれぞれのピッチ個数が大きい程小さくなっている。   Thus, the pitch number 85 of the land portion row 3 passing through the tread center 125 is larger than the pitch number 64 of the land portion rows 2 and 4 on both sides, and the pitch number 64 of the land portion rows 2 and 4 is the maximum. It is made larger than the number of pitches of the outer land portion rows 1 and 5, and the rigidity of each of the land portion rows 1, 2, 3, 4, and 5 is smaller as the number of pitches is larger.

また、ピッチ個数最小の陸部列1に対し、他の陸部列2、3、4のピッチ個数64、85、64はこの最小ピッチ個数43より2箇以上多く、且つ、2倍未満にされている。   Also, with respect to the land portion row 1 having the smallest number of pitches, the pitch numbers 64, 85, 64 of the other land portion rows 2, 3, 4 are more than two and less than twice the minimum pitch number 43. ing.

(評価試験結果)
表1の評価試験結果が示すように、実施形態1の空気入りタイヤ101(実施例1)は、比較例と較べ、パターンノイズ及び操縦安定性については実車上で良好な評価が得られると共に、大小のスリップ角度のいずれにおいても、大きなコーナリングフォースFを発生していることが確認された。
(Evaluation test results)
As shown in the evaluation test results of Table 1, the pneumatic tire 101 of the first embodiment (Example 1) has a good evaluation on the actual vehicle for pattern noise and steering stability, as compared with the comparative example. It was confirmed that a large cornering force F was generated at both large and small slip angles.

(空気入りタイヤ101の作用及び効果)
上記のように、空気入りタイヤ101では、中央部の陸部列3で陸部119のピッチ個数を大きくし、端部側の陸部列1,2,4,5で各陸部115,117,121,123のピッチ個数をそれより小さくしたことによって騒音が分散し低減されている。
(Operation and effect of the pneumatic tire 101)
As described above, in the pneumatic tire 101, the number of pitches of the land portions 119 is increased in the land portion row 3 in the central portion, and the land portions 115, 117 in the land portion rows 1, 2, 4, and 5 on the end side. , 121, 123, the noise is dispersed and reduced by making the number of pitches smaller than that.

さらに、中央部の陸部列3ではピッチ個数を大きくすることによって剛性を適度に下げており、端部側の陸部列1,2,4,5ではピッチ個数を小さくすることによって剛性をそれより上げている。   Furthermore, the rigidity is moderately lowered by increasing the number of pitches in the land portion row 3 in the central portion, and the rigidity is reduced by reducing the number of pitches in the land portion rows 1, 2, 4, and 5 on the end side. It is raising more.

その結果、トレッドセンター125の陸部列3が主に接地する緩いコーナリング走行時は、陸部列3の剛性を下げたことにより、接地長が長くなって大きなコーナリングフォースFが得られ、操縦安定性やレーンチェンジ性が向上している。   As a result, at the time of loose cornering where the land section row 3 of the tread center 125 mainly touches down, the rigidity of the land section row 3 is lowered, so that the contact length becomes longer and a large cornering force F is obtained, thereby stabilizing the steering. And lane change are improved.

また、端部側の陸部列1,2,4,5が接地する急カーブのコーナリング時は、これらの剛性を大きくしたことにより、バックリング変形が軽減されて大きなコーナリングフォースFが得られ、急カーブや限界走行時の車両挙動安定性が向上している。   In addition, when cornering a sharp curve where the land row 1, 2, 4, 5 on the end side contacts the ground, buckling deformation is reduced and a large cornering force F is obtained by increasing these rigidity. The vehicle behavior stability at the time of sharp curve and limit driving is improved.

第2実施形態Second embodiment

図2と表1によって空気入りタイヤ201(本発明の第2実施形態)の説明をする。   A pneumatic tire 201 (second embodiment of the present invention) will be described with reference to FIG. 2 and Table 1.

[空気入りタイヤ201の特徴]
空気入りタイヤ201はキャンバー角度がネガティブに設定されたサスペンション(車両の前後から見てタイヤをハの字型に傾斜して取り付ける設定のサスペンション)に装着された空気入りタイヤであって、そのトレッド面には、図2のように、タイヤの周方向に設けられた4本の主溝203によって陸部列10、陸部列20、陸部列30、陸部列40、陸部列50が形成されており、さらに、陸部列10、陸部列20、陸部列30、陸部列40、陸部列50では、それぞれ所定の間隔で配置されたタイヤ幅方向の副溝(サイプ)205,207,209,211,213によって陸部215,217,219,221,223がそれぞれ形成されている。
[Features of the pneumatic tire 201]
The pneumatic tire 201 is a pneumatic tire mounted on a suspension in which the camber angle is set to be negative (a suspension in which the tire is inclined and attached in a C shape when viewed from the front and rear of the vehicle), and the tread surface thereof As shown in FIG. 2, the land portion row 10, the land portion row 20, the land portion row 30, the land portion row 40, and the land portion row 50 are formed by four main grooves 203 provided in the circumferential direction of the tire. Further, in the land portion row 10, the land portion row 20, the land portion row 30, the land portion row 40, and the land portion row 50, sub-grooves (sipes) 205 in the tire width direction arranged at predetermined intervals, respectively. , 207, 209, 211, 213 form land portions 215, 217, 219, 221, 223, respectively.

各副溝205,207,209,211,213の間隔によって各陸部215,217,219,221,223のピッチ個数はそれぞれ、53、75、85、64、43に設定されており、このピッチ個数は請求項3の構成で、陸部列数N=5の場合の構成である陸部列30>陸部列20>陸部列40>陸部列10>陸部列50の条件を満たしている。   The number of pitches of the land portions 215, 217, 219, 221, and 223 is set to 53, 75, 85, 64, and 43 according to the interval between the sub grooves 205, 207, 209, 211, and 213, respectively. The number is the configuration of claim 3 and satisfies the condition of land portion row 30> land portion row 20> land portion row 40> land portion row 10> land portion row 50, which is a constitution when the number of land portion rows N = 5. ing.

このように、トレッドセンター225を通る陸部列30のピッチ個数85は、車両内側に隣接した陸部列20のピッチ個数75より大きく、陸部列20のピッチ個数75は車両外側で陸部列30と隣接した陸部列40のピッチ個数64より大きく、陸部列40のピッチ個数64は車両の最も内側の陸部列10のピッチ個数53より大きく、陸部列10のピッチ個数53は車両の最も外側の陸部列50のピッチ個数43より大きくされており、各陸部列10,20,30,40,50の剛性はそれぞれのピッチ個数が大きい程小さくなっている。   Thus, the pitch number 85 of the land portion row 30 passing through the tread center 225 is larger than the pitch number 75 of the land portion row 20 adjacent to the inside of the vehicle, and the pitch number 75 of the land portion row 20 is outside the vehicle. 30 is larger than the pitch number 64 of the land portion row 40, the pitch number 64 of the land portion row 40 is larger than the pitch number 53 of the innermost land portion row 10 of the vehicle, and the pitch number 53 of the land portion row 10 is the vehicle. The outermost land portion row 50 has a larger number of pitches 43, and the rigidity of each land portion row 10, 20, 30, 40, 50 becomes smaller as the number of pitches increases.

また、ピッチ個数最小の陸部列50に対し他の陸部列10,20,30,40のピッチ個数53、75、85、64はこの最小ピッチ個数43より2箇以上多く、且つ、2倍未満にされている。   Further, the number of pitches 53, 75, 85, and 64 of the other land portion rows 10, 20, 30, and 40 is two or more more than this minimum pitch number 43 and doubles the land portion row 50 having the smallest number of pitches. Has been less than.

また、各陸部列10,20,40,50において各陸部215,217,219,221,223は、互いに周方向にランダムになるように配列されている。   Moreover, in each land part row | line | column 10,20,40,50, each land part 215,217,219,221,223 is arranged so that it may become random mutually in the circumferential direction.

(評価試験結果)
表1に示した評価試験の結果、実施例2の空気入りタイヤ201は、パターンノイズ及び操縦安定性及びコーナリングフォースFについて、比較例と較べて、また、実施例1と較べても、さらに良好な評価が得られ、ネガティブキャンバー角度での空気入りタイヤ201の優秀性が確認された。
(Evaluation test results)
As a result of the evaluation test shown in Table 1, the pneumatic tire 201 of Example 2 is even better than the comparative example and the pattern noise, steering stability, and cornering force F compared to the comparative example. Evaluation was obtained, and the superiority of the pneumatic tire 201 at the negative camber angle was confirmed.

(空気入りタイヤ201の作用及び効果)
上記のように、空気入りタイヤ201では、中央部の陸部列30で陸部119のピッチ個数を大きくすることによって剛性を適度に下げ、他の陸部列20,40,10,50はこの順でピッチ個数を小さくして剛性を上げると共に、車両の内側(陸部列10側)の剛性が外側端部(陸部列50側)の剛性より小さくなるようにして、騒音を分散し低減させている。
(Operation and effect of the pneumatic tire 201)
As described above, in the pneumatic tire 201, the rigidity is appropriately lowered by increasing the number of the pitches of the land portions 119 in the land portion row 30 in the central portion, and the other land portion rows 20, 40, 10, and 50 are In order to increase the rigidity by decreasing the number of pitches in order, the rigidity on the inner side (land section row 10 side) of the vehicle is made smaller than the rigidity on the outer end (land section row 50 side) to disperse and reduce noise. I am letting.

また、トレッドセンター225の陸部列30付近が主に接地する緩カーブでのコーナリング走行時は、陸部列30の剛性を下げたことにより、接地長が長くなって大きなコーナリングフォースFが得られ、操縦安定性やレーンチェンジ性が向上する。   Also, when cornering running on a gentle curve where the land portion row 30 of the tread center 225 is mainly in contact with the ground, lowering the rigidity of the land portion row 30 increases the contact length and provides a large cornering force F. , Improve steering stability and lane changeability.

また、端部側の陸部列20,40,10,50が接地する急カーブのコーナリング時は、これらの剛性を大きくしたことにより、バックリング変形が軽減されて大きなコーナリングフォースFが得られ、急カーブや限界走行時の車両挙動安定性が向上する。   In addition, when cornering a sharp curve where the land portion row 20, 40, 10, 50 on the end side contacts the ground, by increasing these rigidity, buckling deformation is reduced and a large cornering force F is obtained, The vehicle behavior stability at the time of sharp curve and limit driving is improved.

また、ネガティブキャンバー角のサスペンションに装着された空気入りタイヤ201は、直進走行時に剛性が小さい陸部列10側が路面と接触するように装着されるから、直進走行時と緩カーブ時に、接地長がさらに長くなり、それだけ大きなコーナリングフォースFが得られ、操縦安定性やレーンチェンジ性がさらに向上する。   In addition, the pneumatic tire 201 mounted on the negative camber angle suspension is mounted so that the land portion row 10 side, which has low rigidity during straight traveling, is in contact with the road surface. The longer cornering force F is obtained, and the steering stability and lane changeability are further improved.

また、急カーブ時は、空気入りタイヤ201のバンプに伴うキャンバー角の変化にも影響されるが、急カーブに伴う車重(荷重)移動に伴って、剛性が最も小さい陸部列30側に接地面が移動するから、陸部列30の剛性を小さくしただけ接地面積が広くなり、広い接地面積と摩擦係数μとによってタイヤ201のグリップ力が大きくなるから、それだけ大きなコーナリングフォースFが得られ、急カーブや限界走行時の車両挙動安定性がさらに向上する。   Further, at the time of a sharp curve, it is influenced by a change in camber angle accompanying the bump of the pneumatic tire 201, but with the movement of the vehicle weight (load) accompanying the sharp curve, the rigidity toward the land portion row 30 side where the rigidity is the smallest. Since the ground contact surface moves, the ground contact area increases as the rigidity of the land row 30 is reduced, and the grip force of the tire 201 increases due to the wide contact area and the friction coefficient μ, so that a large cornering force F is obtained. In addition, the vehicle behavior stability at the time of a sharp curve and limit driving is further improved.

直進走行時に剛性の小さい陸部列10側を路面と接触させることによる空気入りタイヤ201の効果は、表1の評価試験結果での高評価にも現れている。   The effect of the pneumatic tire 201 by bringing the land portion row 10 side having low rigidity in contact with the road surface during straight traveling also appears in the high evaluation in the evaluation test results of Table 1.

また、陸部列10,20,40,50の陸部215,217,219,221,223を互いに周方向にランダム配列したことにより、大きなパターンノイズの発生が防止され、騒音低減効果がさらに向上している。   In addition, since the land portions 215, 217, 219, 221, and 223 of the land portion rows 10, 20, 40, and 50 are randomly arranged in the circumferential direction, generation of large pattern noise is prevented, and the noise reduction effect is further improved. is doing.

(評価試験結果)
表1に示すように、複数列の陸部列にそれぞれ所望のピッチで陸部を形成した実施形態1の空気入りタイヤ101(実施例1)及び実施形態2の空気入りタイヤ201(実施例2)と、複数列の陸部列に同一ピッチで陸部を形成した従来の空気入りタイヤ(比較例)とで、パターンノイズと操縦安定性を試験し、コーナリングフォースFを測定し、比較例を指数100として、各実施例1,2の評価を行った。
(Evaluation test results)
As shown in Table 1, the pneumatic tire 101 according to the first embodiment (Example 1) and the pneumatic tire 201 according to the second embodiment (Example 2) in which land portions are formed at a desired pitch in a plurality of land portion rows, respectively. ) And a conventional pneumatic tire (comparative example) in which land portions are formed in a plurality of land portion rows at the same pitch, pattern noise and steering stability are tested, cornering force F is measured, and a comparative example Each of Examples 1 and 2 was evaluated with an index of 100.

パターンノイズ及び操縦安定性は、各実施例1,2の空気入りタイヤをサイズ14×6JJのリムに装着し、空気圧を2.0kgf/cm2とし、2000CCの前輪駆動車に取り付けてテストコースで官能試験を行った。   The pattern noise and steering stability were measured on the test course by attaching the pneumatic tires of Examples 1 and 2 to a rim of size 14 × 6JJ, setting the air pressure to 2.0 kgf / cm2, and attaching it to a 2000CC front-wheel drive vehicle. A test was conducted.

また、コーナリングフォースFは、フラットベルトタイプの試験機を用い、それぞれ1°のネガティブキャンバー角度で、1°と5°のスリップ角度を与えたときのコーナリングフォースFを測定した。

Figure 0004684059
Further, the cornering force F was measured by using a flat belt type tester and giving a slip angle of 1 ° and 5 ° with a negative camber angle of 1 °.
Figure 0004684059

[本発明の範囲に含まれる他の態様]
なお、請求項1の構成は、請求項3の構成のように、キャンバー角を与えたサスペンションに装着してもよい。
[Other Embodiments Included within the Scope of the Present Invention]
The configuration of claim 1 may be mounted on a suspension having a camber angle as in the configuration of claim 3.

第1実施形態の空気入りタイヤ101のトレッド面を示す図面である。It is drawing which shows the tread surface of the pneumatic tire 101 of 1st Embodiment. 第2実施形態の空気入りタイヤ201のトレッド面を示す図面である。It is drawing which shows the tread surface of the pneumatic tire 201 of 2nd Embodiment. スリップ角が小さいコーナリング時のトレッド接地形状を示す図面である。It is drawing which shows the tread grounding shape at the time of cornering with a small slip angle. 限界コーナリング時のトレッド接地形状を示す図面である。It is drawing which shows the tread grounding shape at the time of limit cornering. 従来の空気入りタイヤのトレッド面を示す図面である。It is drawing which shows the tread surface of the conventional pneumatic tire.

符号の説明Explanation of symbols

1,2,3,4,5 陸部列
101 空気入りタイヤ
103 主溝
105,107,109,111,113 副溝(サイプ)
115,117,119,121,123 陸部
10,20,30,40,50 陸部列
201 空気入りタイヤ
203 主溝
205,207,209,211,213 副溝(サイプ)
215,217,219,221,223 陸部
1, 2, 3, 4, 5 Land part row 101 Pneumatic tire 103 Main groove 105, 107, 109, 111, 113 Sub groove (Sipe)
115, 117, 119, 121, 123 Land portion 10, 20, 30, 40, 50 Land portion row 201 Pneumatic tire 203 Main grooves 205, 207, 209, 211, 213 Sub grooves (sipe)
215, 217, 219, 221, 223 Land

Claims (3)

前輪、または、後輪の少なくとも一方のキャンバー角度設定がネガティブ角度であるサスペンションを備えた車両の前記ネガティブキャンバーサスペンションに装着され、
前記車両に対する装着方向が決められており、トレッド面にタイヤ周方向に延びる複数の主溝を設け、前記主溝によってタイヤ幅方向に総数が5である複数の陸部列を区画形成し、これらの陸部列にタイヤ幅方向に延びる副溝またはサイプをタイヤ周方向に沿って所定のピッチで配置した空気入りタイヤにおいて、
前記副溝またはサイプによって区分したピッチ数を各陸部列で相違させ、陸部列を車両装着内側から順に陸部列1、陸部列2……陸部列5としたときの各陸部列におけるピッチ個数を、陸部列3>陸部列2>陸部列4>陸部列1>陸部列5としたことを特徴とする空気入りタイヤ。
The camber angle setting of at least one of the front wheels or the rear wheels is attached to the negative camber suspension of the vehicle including a suspension having a negative angle,
The mounting direction with respect to the vehicle is determined, a plurality of main grooves extending in the tire circumferential direction are provided on the tread surface, and a plurality of land portion rows having a total number of 5 in the tire width direction are defined by the main grooves, and these In the pneumatic tire in which the sub-grooves or sipes extending in the tire width direction are arranged at a predetermined pitch along the tire circumferential direction,
The number of pitches obtained by dividing by the sub-grooves or sipes are made different from each land row, land row 1 a land row from the vehicle inner side in order, land row 2 ...... Each land portion when the land row 5 A pneumatic tire characterized in that the number of pitches in the row is land portion row 3> land portion row 2> land portion row 4> land portion row 1> land portion row 5 .
請求項1に記載された発明であって、
各陸部列での陸部のピッチを、ランダム配列にしたことを特徴とする空気入りタイヤ。
The invention according to claim 1,
A pneumatic tire characterized by a random arrangement of land pitches in each land row.
請求項1又は請求項2に記載された発明であって、
ピッチ個数を最小にした陸部列に対し、他の陸部列のピッチ個数を、前記最小のピッチ個数より2箇以上とし、且つ、2倍未満にしたことを特徴とする空気入りタイヤ。
The invention according to claim 1 or claim 2 ,
A pneumatic tire, wherein the number of pitches of the other land portion rows is set to two or more and less than twice the minimum number of pitches with respect to the land portion row having the minimum number of pitches.
JP2005272439A 2005-09-20 2005-09-20 Pneumatic tire Expired - Fee Related JP4684059B2 (en)

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US20110208488A1 (en) * 2008-09-18 2011-08-25 Bridgestone Corporation Method of designing tire and tire
US8170839B2 (en) * 2009-04-24 2012-05-01 Bridgestone Americas Tire Operations, Llc Method of designing a tire tread
WO2011090203A1 (en) * 2010-01-25 2011-07-28 株式会社ブリヂストン Tire
JP5452386B2 (en) * 2010-06-22 2014-03-26 株式会社ブリヂストン Pneumatic tire
JP5623864B2 (en) * 2010-10-19 2014-11-12 株式会社ブリヂストン Pneumatic tire
JP5440590B2 (en) * 2011-11-14 2014-03-12 横浜ゴム株式会社 Pneumatic tire
JP6514591B2 (en) * 2015-07-09 2019-05-15 住友ゴム工業株式会社 Heavy duty pneumatic tire
JP7296871B2 (en) * 2019-12-11 2023-06-23 株式会社ブリヂストン pneumatic tire

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JPS6361608A (en) * 1986-09-03 1988-03-17 Yokohama Rubber Co Ltd:The Pneumatic tire
JPS63159110A (en) * 1986-12-23 1988-07-02 Yokohama Rubber Co Ltd:The Fneumatic tire
JPH05221206A (en) * 1991-04-12 1993-08-31 Sumitomo Rubber Ind Ltd Vehicle tire

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JPS6361608A (en) * 1986-09-03 1988-03-17 Yokohama Rubber Co Ltd:The Pneumatic tire
JPS63159110A (en) * 1986-12-23 1988-07-02 Yokohama Rubber Co Ltd:The Fneumatic tire
JPH05221206A (en) * 1991-04-12 1993-08-31 Sumitomo Rubber Ind Ltd Vehicle tire

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