JP4689402B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP4689402B2
JP4689402B2 JP2005231612A JP2005231612A JP4689402B2 JP 4689402 B2 JP4689402 B2 JP 4689402B2 JP 2005231612 A JP2005231612 A JP 2005231612A JP 2005231612 A JP2005231612 A JP 2005231612A JP 4689402 B2 JP4689402 B2 JP 4689402B2
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sipe
ridges
zigzag
block
pneumatic tire
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JP2007045316A (en
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稔之 大橋
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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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
    • B60C11/12Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C11/1218Three-dimensional shape with regard to depth and extending direction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Description

本発明は、少なくとも1本のサイプを形成したブロック又はリブなどの陸部を有するトレッドパターンを備えた空気入りタイヤに関し、特にスタッドレスタイヤとして有用である。   The present invention relates to a pneumatic tire including a tread pattern having a land portion such as a block or a rib having at least one sipe, and is particularly useful as a studless tire.

従来より、スタッドレスタイヤのアイス性能を向上させる目的で、タイヤパターンの各部(センター部、メディエイト部、ショルダー部)に複数のサイプを配置したものが知られている。かかるサイプの形状としては、サイプの深さ方向に形状が変化しない平面又は波型のサイプが従来は一般的であった。このようなサイプをブロックに形成することにより、エッジ効果、除水効果、及び凝着効果が向上するため、サイプの本数は近年増加する傾向にあった。   Conventionally, in order to improve the ice performance of a studless tire, a tire pattern in which a plurality of sipes are arranged in each part (center part, mediate part, shoulder part) is known. As a shape of such a sipe, a flat or corrugated sipe whose shape does not change in the depth direction of the sipe has been generally used. By forming such sipes in blocks, the edge effect, the water removal effect, and the adhesion effect are improved, so the number of sipes has tended to increase in recent years.

しかし、サイプの本数を増やしてサイプ密度を高めていくと、エッジ数は増えるものの、ブロック全体の剛性が低下してサイプが過度に倒れ込むことにより、逆にエッジ効果が小さくなり、アイス性能も低下するという問題が生じる。このため、サイプの形状を深さ方向で変化させて、サイプの倒れ込みを抑制した、いわゆる3次元サイプが近年注目されている。   However, increasing the number of sipe and increasing the sipe density increases the number of edges, but the rigidity of the entire block decreases and the sipe collapses excessively, conversely the edge effect decreases and ice performance also decreases Problem arises. For this reason, attention has recently been paid to so-called three-dimensional sipe, in which the shape of the sipe is changed in the depth direction to suppress the sipe collapse.

これまで3次元サイプの形状としては、種々のものが提案されており、幾つかのタイプに分けることができるが、そのうちの1つとして波型サイプの振幅を深さによって変えたもの(例えば、特許文献1参照)や、波型サイプの内壁面の凹凸列(丘陵)の方向を陸部踏面の法線方向から斜めに傾斜させたもの(例えば、特許文献2参照)などが存在する。これらは何れも、ブロックとサイプが倒れ込む際に、斜め方向に延びたサイプ内壁面の凸条と凹条とが係合する作用により、倒れ込みを抑制するものである。   Various types of three-dimensional sipes have been proposed so far and can be divided into several types. One of them is the one in which the amplitude of the wave-shaped sipes is changed according to the depth (for example, Patent Document 1), and those in which the concave / convex row (hills) of the inner wall surface of the corrugated sipe is inclined obliquely from the normal direction of the land tread (see Patent Document 2, for example). In any case, when the block and the sipe fall down, the fall of the sipe inner wall surface extending in an oblique direction is suppressed by the action of engagement between the ridge and the concave stripe.

しかしながら、上記特許文献1に記載のサイプでは、凸条の方向を全体的に傾斜させにくいため係合作用が小さいという問題がある。また、上記特許文献2に記載のように、凹凸列が斜め方向に傾斜したサイプでは、ブロック内で接地圧が不均一となり、これよりアイス路面での制動性能や耐偏摩耗性能が十分改善できないという問題がある。   However, the sipe described in Patent Document 1 has a problem that the engaging action is small because the direction of the ridges is difficult to be inclined as a whole. In addition, as described in Patent Document 2, in a sipe in which the concavo-convex row is inclined in an oblique direction, the contact pressure is not uniform in the block, and thus braking performance and uneven wear resistance performance on the ice road surface cannot be sufficiently improved. There is a problem.

一方、下記の特許文献3には、ブロック表面から深さ方向に、縦断面形状がジグザグ形状又は波形状であるサイプを設けた空気入りタイヤが開示されている。このサイプでは、サイプの溝内表面に凹凸が有るため、制動時のように前後力が生じる場合に、凹部と凸部が係合してブロック片(サイプ)が倒れ込みにくくなる可能性がある。   On the other hand, PTL 3 below discloses a pneumatic tire provided with a sipe having a zigzag shape or a wave shape in the longitudinal cross-section in the depth direction from the block surface. In this sipe, since the groove inner surface of the sipe has irregularities, there is a possibility that the block piece (sipe) will not easily fall down due to the engagement between the concave and convex portions when a longitudinal force is generated as in braking.

しかしながら、実際に前後力により凹部と凸部が係合するとき、両者の接触状態が面接触と言うより線接触に近いものとなるため、ブロック片の倒れ込みの抑制効果が十分とは言えず、これを更に改善する余地があった。また、旋回時のように横力が生じた場合、深さ方向に形状が変化しない通常の波形サイプと比較して、ブロック全体の剪断変形が生じ易くなり、接地圧が不均一になるという問題が生じる場合があった。   However, when the concave portion and the convex portion are actually engaged by the longitudinal force, the contact state between the two becomes closer to the line contact rather than the surface contact, so the effect of suppressing the collapse of the block piece cannot be said to be sufficient. There was room for further improvement. In addition, when a lateral force is generated as in turning, the shear pressure of the entire block is likely to occur and the contact pressure becomes non-uniform compared to a normal waveform sipe whose shape does not change in the depth direction. May occur.

また、下記の特許文献4には、サイプがトレッド面においてジグザグ形状をなし、ブロック内部ではタイヤ径方向の2箇所以上でタイヤ周方向に屈曲してタイヤ幅方向に連なる屈曲部を形成し、かつ該屈曲部においてタイヤ周方向に振幅をもったジグザグ形状を形成した空気入りタイヤが提案されている。   Further, in Patent Document 4 below, the sipe has a zigzag shape on the tread surface, and in the block, a bent portion that is bent in the tire circumferential direction at two or more locations in the tire radial direction and is continuous in the tire width direction, and There has been proposed a pneumatic tire in which a zigzag shape having an amplitude in the tire circumferential direction is formed at the bent portion.

しかし、この文献に開示されているサイプは、いずれも3次元サイプがブロック表面まで連続したものであり、このため制動時などにおいて、ブロック片の倒れ込みが極度に小さくなり、かえってアイス路面での制動性能が低下する場合があり、サイプ加工も困難となる。   However, all of the sipes disclosed in this document are three-dimensional sipes that continue to the surface of the block. For this reason, during braking, etc., the block piece collapses to an extremely low level. The performance may be reduced, and sipe processing becomes difficult.

特開昭59−193306号公報JP 59-193306 A 特開平10−258615号公報Japanese Patent Laid-Open No. 10-258615 特開平4−310407号公報JP-A-4-310407 特開2005−126055号公報Japanese Patent Laid-Open No. 2005-126055

そこで、本発明の目的は、前後力によるブロック片の倒れ込みを適度に抑制して、アイス路面での制動性能や耐偏摩耗性能が改善可能であると共に、横力によるブロックの剪断変形も生じにくい空気入りタイヤを提供することにある。   Therefore, an object of the present invention is to moderately suppress the block pieces from falling due to longitudinal force, and to improve braking performance and uneven wear resistance performance on an ice road surface, and to prevent shear deformation of the block due to lateral force. It is to provide a pneumatic tire.

上記目的は、下記の如き本発明により達成できる。
即ち、本発明の空気入りタイヤは、少なくとも1本のサイプを形成した陸部を有するトレッドパターンを備えた空気入りタイヤにおいて、前記サイプの何れか一方の内壁面には、サイプ幅方向に連続して延びて深さ方向に振幅を有するジグザグ状又は波状の凸条を備え、他方の内壁面には前記凸条に係合可能な凹条を備えると共に、陸部表面から前記凸条及び前記凹条までのサイプ領域は、横断面形状がジグザグ状又は波状で且つ深さ方向に形状が変化しないサイプで形成されていて、前記凸条及び前記凹条におけるジグザグ状又は波状の周期を、陸部表面から前記凸条及び前記凹条までのサイプ領域における横断面形状のジグザグ状又は波状の周期に合わせてあり、陸部表面から前記凸条及び前記凹条までのサイプ領域における凸部と、前記凸条の陸部表面に向かって突き出した頂部とが一致することを特徴とする。
The above object can be achieved by the present invention as described below.
That is, the pneumatic tire according to the present invention is a pneumatic tire having a tread pattern having a land portion in which at least one sipe is formed, and is continuous with the inner wall surface of any one of the sipe in the sipe width direction. depth extending Te to comprise a zigzag or wavy ridges with amplitude, with the other inner wall surface provided with engageable concave on the ridges, said ridges and said concave from the land portion surface The sipe region up to the strip is formed by a sipe whose cross-sectional shape is zigzag or corrugated and whose shape does not change in the depth direction, and the zigzag or corrugated period of the convex strip and the concave strip is It is matched with the zigzag or wavy period of the cross-sectional shape in the sipe region from the surface to the ridge and the recess, and the projection in the sipe region from the land surface to the ridge and the recess, and the front A top portion protruding toward the land portion surface of the ridges, characterized in that match.

本発明の空気入りタイヤによると、サイプ内の係合可能な凸条及び凹条が、サイプ幅方向にジグザグ状又は波状に延びているため、両者の係合が線接触に近い状態であっても、それがジグザグ状又は波状になって接触面積が大きくなるので、前後力によるブロック片の倒れ込みを適度に抑制して、アイス路面での制動性能や耐偏摩耗性能を更に改善することができる。また、凸条及び凹条が直線状でないため、横力が生じた際に凸条と凹条の係合が効果的に生じるので、ブロックの剪断変形も生じにくくなる。更に、陸部表面から前記凸条及び前記凹条までのサイプ領域は、横断面形状がジグザグ状又は波状のサイプで形成されているため、前後力によるブロック片の倒れ込みを適度に生じさせることができ、エッジ効果、除水効果、及び凝着効果を発現しながら、内部のサイプによって、前記のようにブロック片の倒れ込みを適度に抑制することができる。   According to the pneumatic tire of the present invention, the engaging ridges and ridges in the sipe extend in a zigzag shape or a wave shape in the sipe width direction. However, since it becomes zigzag or corrugated and the contact area becomes large, it is possible to moderately suppress the block pieces from falling by the longitudinal force, and to further improve the braking performance and uneven wear resistance performance on the ice road surface. . In addition, since the ridges and the recesses are not linear, the engagement between the ridges and the recesses effectively occurs when a lateral force is generated, so that the shear deformation of the block is less likely to occur. Furthermore, since the sipe region from the land surface to the ridge and the ridge is formed with a sipe having a zigzag or wavy cross-sectional shape, it may cause the block pieces to fall down due to longitudinal force. In addition, while the edge effect, the water removal effect, and the adhesion effect are expressed, the falling of the block piece can be appropriately suppressed by the internal sipe as described above.

上記において、前記サイプの何れか一方の内壁面には、サイプ幅方向に延びるジグザグ状又は波状の凸条及び凹条を備え、他方の内壁面には前記凸条に係合可能な凹条及び前記凹条に係合可能な凸条を備えることが好ましい。この構成により、係合箇所が2列になるため、前後力によるブロック片の倒れ込みを適度に抑制して、アイス路面での制動性能や耐偏摩耗性能をより改善することができる。また、凸条の方向が前後の両方になるため、制動時と発進時との両者について、ブロック片の倒れ込みを適度に抑制することができる。   In the above, the inner wall surface of any one of the sipe is provided with zigzag or wavy ridges and ridges extending in the sipe width direction, and the other inner wall surface is provided with a ridge that can be engaged with the ridges and It is preferable to provide a ridge that can be engaged with the ridge. With this configuration, since the engagement locations are in two rows, it is possible to moderately prevent the block pieces from falling due to the longitudinal force and further improve the braking performance and uneven wear resistance performance on the ice road surface. Moreover, since the direction of the ridges is both forward and backward, the block pieces can be appropriately prevented from falling down during both braking and starting.

更に、最も深い部分のサイプ領域は、平面サイプで形成されていることが好ましい。このように、最も深い部分を平面サイプとすることで、ブロック片のチャンクアウト(破断、脱落)を効果的に防止することができる。   Further, the deepest sipe region is preferably formed by a plane sipe. Thus, by making the deepest part into a plane sipe, chunk-out (breaking, dropping off) of the block piece can be effectively prevented.

以下、本発明の実施の形態について、図面を参照しながら説明する。図1は、本発明の空気入りタイヤにおけるトレッドパターンの陸部の一例を示す斜視図であり、ブロックの一部を拡大して、一部破断によりサイプ内壁面を示している。図2は、本発明の空気入りタイヤにおけるサイプ内壁面の寸法等を示す説明図である。本発明において、図中の「+」は凸形状を示し、「−」は凹形状を示している。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a land portion of a tread pattern in a pneumatic tire according to the present invention, in which a part of a block is enlarged and a sipe inner wall surface is shown by partial breakage. FIG. 2 is an explanatory view showing dimensions and the like of the sipe inner wall surface in the pneumatic tire of the present invention. In the present invention, “+” in the figure indicates a convex shape, and “−” indicates a concave shape.

本発明の空気入りタイヤは、少なくとも1本のサイプを形成した陸部を有するトレッドパターンを備えるものである。本実施形態では、図1に示すように、陸部表面から波形サイプ11、凸条部12、凹条部13、平面サイプ14からなるサイプ10がブロック1に形成されている例を示す。   The pneumatic tire according to the present invention includes a tread pattern having a land portion in which at least one sipe is formed. In the present embodiment, as shown in FIG. 1, an example is shown in which a sipe 10 including a corrugated sipe 11, a convex strip portion 12, a concave strip portion 13, and a planar sipe 14 is formed in the block 1 from the land surface.

トレッドパターンのブロック1以外の部分は、何れのパターンでもよいが、例えばブロック1の左右にブロックを設けたものが挙げられる。ブロック1は、この形状に限らず、長方形、平行四辺形、V字型、5角形、多角形又は曲線基調のブロックなど何れでもよい。   The portion other than the block 1 of the tread pattern may be any pattern, and examples include a block provided on the left and right sides of the block 1. The block 1 is not limited to this shape, and may be any of a rectangular shape, a parallelogram shape, a V shape, a pentagon shape, a polygonal shape, or a curved base block.

本発明では、図1に示すように、サイプ10の何れか一方の内壁面Sには、サイプ幅方向WDに延びるジグザグ状又は波状の凸条S1を備え、他方の内壁面には前記凸条S1に係合可能な凹条S2を備える。本実施形態では、更に、一方の内壁面Sには、サイプ幅方向WDに延びるジグザグ状又は波状の凹条S3を備え、他方の内壁面には前記凹条S3に係合可能な凸条S4を備える例を示す。本発明では、凸条S1と凹条S2とによって、サイプの凸条部12が形成され、凹条S3と凸条S4とによって、サイプの凹条部13が形成されている。   In the present invention, as shown in FIG. 1, any one of the inner wall surfaces S of the sipe 10 is provided with a zigzag or wavy convex strip S1 extending in the sipe width direction WD, and the other inner wall surface is provided with the convex strip. A recess S2 that can be engaged with S1 is provided. In the present embodiment, the one inner wall surface S is further provided with a zigzag-shaped or wavy-shaped groove S3 extending in the sipe width direction WD, and the other inner wall surface is a protrusion S4 that can be engaged with the groove S3. An example comprising: In the present invention, the sipe convex strip portion 12 is formed by the convex strip S1 and the concave strip S2, and the sipe concave strip portion 13 is formed by the concave strip S3 and the convex strip S4.

サイプの凸条部12およびサイプの凹条部13の形状は、ジグザグ状又は波状であるが、正弦波に近い波状に限られず、直線と曲線とを交互に組み合わせた波線や矩形波に近いもの等、何れの形状でもよい。   The shape of the sipe ridges 12 and the sipe ridges 13 is zigzag or wavy, but is not limited to a wave close to a sine wave, but close to a wavy line or a rectangular wave in which straight lines and curves are combined alternately Any shape may be used.

図2における寸法等として、サイプの凸条部12およびサイプの凹条部13の周期SCは、波形サイプ11と合わせることが好ましく、例えば、周期SCが1〜6mmが好ましく、1.5〜4mmがより好ましい。また、サイプの凸条部12およびサイプの凹条部13の上下の振幅SAは、0.5〜3mmが好ましい。   As the dimensions in FIG. 2, the cycle SC of the sipe convex portion 12 and the sipe concave portion 13 is preferably matched with the corrugated sipe 11. For example, the cycle SC is preferably 1 to 6 mm, and 1.5 to 4 mm. Is more preferable. The upper and lower amplitudes SA of the sipe ridges 12 and the sipe ridges 13 are preferably 0.5 to 3 mm.

サイプの凸条部12およびサイプの凹条部13は、高さ又は深さが0.5〜2mmが好ましい。0.5mmより小さいと係合効果が小さくなり、2mmより大きいとモールド釜抜け時に抵抗が大きくなる傾向がある。   The sipe ridges 12 and the sipe ridges 13 preferably have a height or depth of 0.5 to 2 mm. If it is smaller than 0.5 mm, the engagement effect is small, and if it is larger than 2 mm, the resistance tends to increase when the mold is removed.

また、サイプの凸条部12およびサイプの凹条部13の幅SWは0.5〜2.5mmが好ましい。幅SWが0.5mmより小さいとブロック片の倒れ込みが大きくなる傾向があり、2.5mmより大きいと間隔が取れなくなる傾向がある。   Further, the width SW of the sipe convex portion 12 and the sipe concave portion 13 is preferably 0.5 to 2.5 mm. When the width SW is smaller than 0.5 mm, the block pieces tend to fall down, and when the width SW is larger than 2.5 mm, there is a tendency that the interval cannot be taken.

また、サイプの凸条部12およびサイプの凹条部13がジグザク状である場合の傾斜角度θは、20〜60°が好ましく、30〜50°がより好ましい。傾斜角度θが20°未満では、角度が鋭角になりすぎて、サイプブレードの作製が困難になり、60°より大きいと、ジグザグ状にする効果が小さくなり、アイス性能の改善効果が小さくなる傾向がある。   Moreover, 20-60 degrees is preferable and 30-50 degrees is more preferable when the sipe convex part 12 and the sipe concave part 13 are zigzag-shaped. If the inclination angle θ is less than 20 °, the angle becomes too acute and it becomes difficult to produce a sipe blade, and if it is more than 60 °, the effect of zigzag is reduced and the effect of improving ice performance tends to be reduced. There is.

上側のサイプの凸条部12の基準線BLの位置は、サイプ10の深さに対して、陸部表面から15〜85%の位置に設けるのが好ましい。これが15%より浅い位置であると、大振幅形状が設定できなくなり、85%より深い位置であると、タイヤ表面付近での倒れこみが大きくなる傾向がある。   The position of the reference line BL of the ridge portion 12 of the upper sipe is preferably provided at a position 15 to 85% from the land surface with respect to the depth of the sipe 10. If the position is shallower than 15%, a large amplitude shape cannot be set. If the position is deeper than 85%, the collapse near the tire surface tends to increase.

本発明では、陸部表面から凸条S1及び凹条S2までのサイプ領域は、横断面形状が波形サイプ11(ジグザグ状でもよい)で形成されている。この波形サイプ11は、従来と同様のものであればよい。また、波形サイプ11と凸条部12とを同期させて形成するのが好ましい。例えば、図1に示すように、波形サイプ11の凸部と、凸条部12の頂部(山部)とが一致するようにするのが好ましい。   In the present invention, the sipe region from the land surface to the ridges S1 and the ridges S2 is formed with a corrugated sipe 11 (may be a zigzag shape). The waveform sipe 11 may be the same as the conventional one. Moreover, it is preferable to form the corrugated sipe 11 and the ridge portion 12 in synchronization. For example, as shown in FIG. 1, it is preferable that the convex part of the corrugated sipe 11 and the top part (mountain part) of the convex strip part 12 coincide.

波形サイプ11は、波形サイプの特性を発揮する上で、周期(例えば凸−凸頂部間の距離)が1〜6mmが好ましく、1.5〜4mmがより好ましい。また、振幅(両側頂部の高さの和)は0.5〜3mmが好ましい。   The waveform sipe 11 is preferably 1 to 6 mm in period (for example, the distance between the convex and convex apexes) and more preferably 1.5 to 4 mm in order to exhibit the characteristics of the waveform sipe. The amplitude (the sum of the heights of the tops on both sides) is preferably 0.5 to 3 mm.

また、本実施形態では、最も深い部分のサイプ領域は、平面サイプ14で形成されている例を示す。   Further, in the present embodiment, an example is shown in which the deepest sipe region is formed by a plane sipe 14.

サイプ10の溝幅は、各部において同じ幅でも、多少異なっていてもよいが、十分なエッジ効果や除水効果を得る上で、0.2〜0.6mmが好ましい。   The groove width of the sipe 10 may be the same width or slightly different in each part, but is preferably 0.2 to 0.6 mm in order to obtain a sufficient edge effect and water removal effect.

また、サイプ10の溝深さは、主溝深さの30〜80%が好ましい。サイプ10は、ブロック表面に対して垂直になるように形成されるのが一般的であるが、ブロック表面の法線に対してサイプが若干(例えば15°以下)傾斜していてもよい。   Further, the groove depth of the sipe 10 is preferably 30 to 80% of the main groove depth. The sipe 10 is generally formed so as to be perpendicular to the block surface, but the sipe may be slightly inclined (for example, 15 ° or less) with respect to the normal line of the block surface.

本発明では、ブロック1の倒れ込み抑制効果が大きいため、サイプ10の本数を増やしてサイプ密度を高めることで、エッジ数を増やしてエッジ効果を更に高めることができる。このような観点から本発明では、サイプ密度0.05〜0.2mm/mm2 が好ましい。 In the present invention, since the fall-in suppressing effect of the block 1 is large, the edge effect can be further enhanced by increasing the number of edges by increasing the number of sipes 10 and increasing the sipe density. From such a viewpoint, in the present invention, a sipe density of 0.05 to 0.2 mm / mm 2 is preferable.

サイプ10は通常、1つのブロック1に対して複数形成されるが、隣接するサイプ10同士は、同一形状でも異なる波形状、傾斜角度、凹凸の周期、振幅であってもよい。但し、加硫成型後の脱型性を良好にするうえで、隣接するサイプ10同士が同一形状であることが、好ましい。   A plurality of sipes 10 are usually formed for one block 1. However, adjacent sipes 10 may have the same shape or different wave shapes, inclination angles, uneven periods, and amplitudes. However, in order to improve the demoldability after vulcanization molding, it is preferable that adjacent sipes 10 have the same shape.

本発明の空気入りタイヤは、上記の如きトレッドパターンを備える以外は、通常の空気入りタイヤと同等であり、従来公知の材料、形状、構造、製法などが何れも本発明に採用できる。   The pneumatic tire of the present invention is the same as a normal pneumatic tire except that it includes the tread pattern as described above, and any conventionally known material, shape, structure, manufacturing method, and the like can be employed in the present invention.

本発明の空気入りタイヤは、前後力によるブロック片の倒れ込みを適度に抑制して、アイス路面での制動性能や耐偏摩耗性能が改善可能であると共に、横力によるブロックの剪断変形も生じにくいトレッドパターンを備えるため、特にスタッドレスタイヤ(冬用タイヤ)として有用である。   The pneumatic tire of the present invention moderately suppresses the falling of the block piece due to the longitudinal force, can improve the braking performance and uneven wear resistance performance on the ice road surface, and is less likely to cause shear deformation of the block due to lateral force. Since it has a tread pattern, it is particularly useful as a studless tire (winter tire).

[他の実施形態]
以下、本発明の他の実施の形態について説明する。
[Other Embodiments]
Hereinafter, other embodiments of the present invention will be described.

(1)前述の実施形態では、波状サイプがブロックに形成されている例を示したが、本発明における陸部は、タイヤ周方向に延びるリブや、タイヤ周方向にジグザグに延びるリブなどであってもよい。また、サイプのタイプも両側オープンサイプに限らず、片側オープンサイプやクローズドサイプであってもよい。   (1) In the above-described embodiment, an example in which the wavy sipe is formed in the block is shown. However, the land portion in the present invention is a rib extending in the tire circumferential direction, a rib extending zigzag in the tire circumferential direction, or the like. May be. Also, the sipe type is not limited to the open sipe on both sides, and may be an open sipe on one side or a closed sipe.

(2)前述の実施形態では、図1のような、波形サイプ11、凸条部12、凹条部13、平面サイプ14からなるサイプ10を形成する例を示したが、本発明では、図3(a)〜(c)に示すように、種々の形態のサイプを形成することができる。   (2) In the above-described embodiment, an example in which the sipe 10 including the corrugated sipe 11, the protruding strip portion 12, the concave strip portion 13, and the planar sipe 14 as shown in FIG. 1 is shown. As shown in 3 (a) to (c), various forms of sipes can be formed.

図3(a)に示す例は、陸部表面から、波形サイプ11、凸条部12、凹条部13、平面サイプ14からなるサイプ10を形成する例である。この例では、波形サイプ11の凸部が1つおきに、凸条部12の頂部(山部)と一致するように形成している。また、凸条部12と凹条部13とをジグザグ状に形成している。   The example shown to Fig.3 (a) is an example which forms the sipe 10 which consists of the waveform sipe 11, the protruding item | line part 12, the recessed item part 13, and the plane sipe 14 from the land part surface. In this example, every other convex portion of the corrugated sipe 11 is formed so as to coincide with the top portion (mountain portion) of the convex strip portion 12. Further, the protruding strip portion 12 and the concave strip portion 13 are formed in a zigzag shape.

図3(b)に示す例は、陸部表面から、波形サイプ11、波状の凸条部12、波形サイプ11からなるサイプ10を形成する例である。本発明では、このように、少なくとも1本のジグザグ状又は波状の凸条部12を設ければよい。図示した例では、上側の波形サイプ11と下側の波形サイプ11とが、同じ周期と位相で形成されているが、これらが異なっていてもよい。   The example shown in FIG. 3B is an example in which a sipe 10 including a corrugated sipe 11, a corrugated ridge 12, and a corrugated sipe 11 is formed from the land surface. In the present invention, at least one zigzag or wavy ridge 12 may be provided as described above. In the illustrated example, the upper waveform sipe 11 and the lower waveform sipe 11 are formed with the same period and phase, but they may be different.

図3(c)に示す例は、平面サイプ14に対して、間隔を開けて2本の短い凸条部12を形成すると共に、凸条部12の上方にのみ波形サイプ11を設けた例である。本発明では、このように、凸条部12がサイプ幅方向の両端まで連続する必要はなく、また、同方向に凸となる凸条部12のみを複数設けてもよい。また、陸部表面付近において、波形サイプ11はサイプ長さの一部のみであってもよい。   The example shown in FIG. 3C is an example in which two short ridges 12 are formed at an interval with respect to the plane sipe 14 and the waveform sipe 11 is provided only above the ridges 12. is there. In the present invention, it is not necessary for the ridges 12 to continue to both ends in the sipe width direction, and only a plurality of ridges 12 that are convex in the same direction may be provided. Further, in the vicinity of the land surface, the waveform sipe 11 may be only a part of the sipe length.

(3)前述の実施形態では、サイプの中央線(基準線)がタイヤ幅方向に形成されている例を示したが、サイプの中央線はタイヤ幅方向に対して、傾斜していてもよく、その場合、傾斜角度が45°以内が好ましい。   (3) In the above-described embodiment, an example in which the center line (reference line) of the sipe is formed in the tire width direction is shown, but the center line of the sipe may be inclined with respect to the tire width direction. In that case, the inclination angle is preferably within 45 °.

(4)前述の実施形態では、図1に示すように、サイプがブロック表面に対して垂直になるように形成された例を示したが、陸部表面の法線に対してサイプの基準面が若干(例えば15°以下)傾斜していてもよい。   (4) In the above-described embodiment, as shown in FIG. 1, the sipe is formed so as to be perpendicular to the block surface. However, the sipe reference plane with respect to the normal of the land surface is shown. May be slightly inclined (for example, 15 ° or less).

以下、本発明の構成と効果を具体的に示す実施例等について説明する。なお、タイヤの各性能評価は、次のようにして行った。   Examples and the like specifically showing the configuration and effects of the present invention will be described below. In addition, each performance evaluation of the tire was performed as follows.

(1)アイス制動性能
タイヤを実車(国産3000ccクラスのFRセダン)に装着し、1名乗車の荷重条件にて、凍結した路面を走行させ、速度40km/hで制動力をかけてABSを作動させた際の制動距離を指数で評価した。なお、評価は従来品(比較例1)を100としたときの指数表示で示し、数値が大きいほど良好な結果を示す。
(1) Ice braking performance Tires are mounted on a real vehicle (domestic 3000cc class FR sedan), run on a frozen road under the load condition of one passenger, and ABS is applied by applying braking force at a speed of 40km / h. The braking distance was evaluated with an index. In addition, evaluation is shown by an index display when the conventional product (Comparative Example 1) is set to 100, and a larger value indicates a better result.

(2)耐摩耗性能
舗装道路を8000km走行したときの段差摩耗量(摩耗によるサイプとサイプとの段差)を測定し、指数で評価した。なお、評価は従来品(比較例1)を100としたときの指数表示で示し、数値が大きいほど良好な結果を示す。
(2) Wear resistance performance The amount of step wear (step difference between sipe and sipe due to wear) when traveling on a paved road for 8000 km was measured and evaluated by an index. In addition, evaluation is shown by an index display when the conventional product (Comparative Example 1) is set to 100, and a larger value indicates a better result.

(3)アイス旋回性能
タイヤを上記と同じ実車に装着し、1名乗車の荷重条件で同じ路面をレムニスケート曲線(8の字曲線:R=25m円)にて走行し、そのラップタイムを指数で評価した。なお、評価は従来品(比較例1)を100としたときの指数表示で示し、数値が大きいほど良好な結果を示す。
(3) Ice turning performance The tire is mounted on the same actual vehicle as above, and the same road surface is run on the Remnis skate curve (eight curve: R = 25m yen) under the load condition of one passenger, and the lap time is evaluated by an index. did. In addition, evaluation is shown by an index display when the conventional product (Comparative Example 1) is set to 100, and a larger value indicates a better result.

比較例1(従来品)
図4(a)に示す平面サイプ14を有する正方形ブロック(縦30mm、横30mm、両側オープンサイプ)を全面(5列)に備えたトレッドパターンにおいて、サイプを下記のサイズで形成してサイズ205/65R15のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表1に示す。サイプ深さを8mm、溝幅を0.3mm、サイプ間隔5mmとした。
Comparative example 1 (conventional product)
In a tread pattern having a square block (30 mm long, 30 mm wide, open sipes on both sides) on the entire surface (5 rows) having a flat sipe 14 shown in FIG. A 65R15 radial tire was produced. Table 1 shows the results of each performance evaluation described above using this tire. The sipe depth was 8 mm, the groove width was 0.3 mm, and the sipe interval was 5 mm.

比較例2(従来品)
図4(b)に示すように平面サイプ14と凸条部12と凹条部13とからなるサイプ10を有する正方形ブロック(縦30mm、横30mm、両側オープンサイプ)を全面(5列)に備えたトレッドパターンにおいて、サイプを下記のサイズで形成してサイズ205/65R15のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表1に示す。全体としてのサイプ深さを8mm、溝幅を0.3mm、サイプ間隔5mmとし、凸条部12の幅2mm、高さ1mm、凹条部13の幅2mm、高さ1mmとした。
Comparative example 2 (conventional product)
As shown in FIG. 4B, the entire surface (5 rows) is provided with a square block (30 mm long, 30 mm wide, both sides open sipe) having a sipe 10 composed of a plane sipe 14, a ridge 12, and a recess 13. A radial tire having a size of 205 / 65R15 was manufactured by forming a sipe with the following size in the tread pattern. Table 1 shows the results of each performance evaluation described above using this tire. The sipe depth as a whole was 8 mm, the groove width was 0.3 mm, the sipe interval was 5 mm, the width of the ridge 12 was 1 mm, the height was 1 mm, the width of the ridge 13 was 2 mm, and the height was 1 mm.

実施例1
図1に示すように波形サイプ11と凸条部12と凹条部13と平面サイプ14からなるサイプ10を有する正方形ブロック(ブロック形状は同じ)を全面に備えたトレッドパターン(サイプ以外は比較例1と同じ)とにおいて、サイプを下記のサイズで形成してサイズ205/65R15のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表1に示す。全体としてのサイプ深さを8mm、溝幅を0.3mm、サイプ間隔5mmとし、波形サイプ11の周期4mm、振幅2mm、凸条部12の幅1.4mm、高さ1mm、周期4mm、振幅2mm、凹条部13も同じ、とした。
Example 1
As shown in FIG. 1, a tread pattern having a square block (same block shape) having a sipe 10 composed of a corrugated sipe 11, a convex ridge 12, a concave ridge 13, and a planar sipe 14 (a comparative example except for the sipe) 1), a sipe was formed in the following size to produce a radial tire of size 205 / 65R15. Table 1 shows the results of each performance evaluation described above using this tire. The sipe depth as a whole is 8 mm, the groove width is 0.3 mm, the sipe interval is 5 mm, the cycle of the corrugated sipe 11 is 4 mm, the amplitude is 2 mm, the width of the ridge 12 is 1.4 mm, the height is 1 mm, the cycle is 4 mm, and the amplitude is 2 mm. The groove 13 is the same.

比較例3
実施例1において、陸部表面付近に波形サイプを設ける代わりに、凸条部と凹条部とを交互に陸部表面まで連続して形成したこと以外は、実施例1と同じ条件でサイズ205/65R15のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表1に示す。
Comparative Example 3
In Example 1, instead of providing a corrugated sipe in the vicinity of the land surface, a size 205 is formed under the same conditions as in Example 1 except that the convex strips and the concave strips are alternately formed continuously up to the land surface. / 65R15 radial tire was manufactured. Table 1 shows the results of each performance evaluation described above using this tire.

比較例4
実施例1において、陸部表面付近に波形サイプを設ける代わりに、平面サイプで形成したこと以外は、実施例1と同じ条件でサイズ205/65R15のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表1に示す。
Comparative Example 4
In Example 1, a radial tire of size 205 / 65R15 was manufactured under the same conditions as in Example 1 except that a flat sipe was used instead of providing a corrugated sipe near the land surface. Table 1 shows the results of each performance evaluation described above using this tire.

Figure 0004689402
Figure 0004689402

表1の結果が示すように、実施例1ではアイス制動性能、耐摩耗性能、アイス旋回性能が、従来の3次元サイプ(比較例2)より大幅に向上した。これに対して、ブロックの表面まで3次元サイプとした比較例3では、アイス制動性能、アイス旋回性能が大きく向上しない。それは表面付近がジグザグでないため倒れ込みが少なく、適度な倒れ込みが得られにくいためであるまた、ブロックの表面付近に波形サイプを形成していない比較例4では、表面が動きすぎてアイス制動性能、アイス旋回性能が大きく向上しない。   As shown in the results of Table 1, in Example 1, the ice braking performance, the wear resistance performance, and the ice turning performance were significantly improved over the conventional three-dimensional sipe (Comparative Example 2). On the other hand, in Comparative Example 3 in which the three-dimensional sipe is formed up to the surface of the block, the ice braking performance and the ice turning performance are not greatly improved. This is because the surface area is not zigzag, so there is little falling down, and it is difficult to obtain a proper leveling down. In Comparative Example 4 where the corrugated sipe is not formed near the surface of the block, the surface moves too much and ice braking performance, The turning performance is not greatly improved.

本発明の空気入りタイヤにおける陸部の一例を示す斜視図The perspective view which shows an example of the land part in the pneumatic tire of this invention 本発明の空気入りタイヤにおけるサイプ内壁面の寸法等を示す説明図Explanatory drawing which shows the dimension of the sipe inner wall surface etc. in the pneumatic tire of this invention 本発明の空気入りタイヤにおけるサイプ内壁面の他の例を示す要部拡大図The principal part enlarged view which shows the other example of the sipe inner wall surface in the pneumatic tire of this invention 従来の空気入りタイヤにおけるサイプ内壁面の例を示す要部拡大図Main part enlarged view showing an example of a sipe inner wall surface in a conventional pneumatic tire

符号の説明Explanation of symbols

1 ブロック(陸部)
10 サイプ
11 波形サイプ
12 サイプの凸条部
13 サイプの凹条部
14 平面サイプ
S サイプ内壁面
S1 凸条
S2 凹条
S3 凹条
S4 凸条
WD サイプ幅方向
1 block (land)
DESCRIPTION OF SYMBOLS 10 Sipe 11 Wave shape sipe 12 Sipe convex part 13 Sipe concave part 14 Plane sipe S Sipe inner wall surface S1 Convex S2 Convex S3 Convex S4 Convex WD sipe width direction

Claims (3)

少なくとも1本のサイプを形成した陸部を有するトレッドパターンを備えた空気入りタイヤにおいて、
前記サイプの何れか一方の内壁面には、サイプ幅方向に連続して延びて深さ方向に振幅を有するジグザグ状又は波状の凸条を備え、他方の内壁面には前記凸条に係合可能な凹条を備えると共に、陸部表面から前記凸条及び前記凹条までのサイプ領域は、横断面形状がジグザグ状又は波状で且つ深さ方向に形状が変化しないサイプで形成されていて、
前記凸条及び前記凹条におけるジグザグ状又は波状の周期を、陸部表面から前記凸条及び前記凹条までのサイプ領域における横断面形状のジグザグ状又は波状の周期に合わせてあり、陸部表面から前記凸条及び前記凹条までのサイプ領域における凸部と、前記凸条の陸部表面に向かって突き出した頂部とが一致することを特徴とする空気入りタイヤ。
In a pneumatic tire provided with a tread pattern having a land portion forming at least one sipe,
Any one of the inner walls of the sipe is provided with zigzag or wavy ridges extending continuously in the sipe width direction and having an amplitude in the depth direction, and the other inner wall surface is engaged with the ridges. The sipe region from the land surface to the ridges and the ridges is formed with a sipe that has a zigzag or wavy cross-sectional shape and does not change in shape in the depth direction .
The zigzag or wavy period in the ridges and the recesses is matched to the zigzag or wavy period of the cross-sectional shape in the sipe region from the land surface to the ridges and the recesses, and the land surface A pneumatic tire characterized in that a convex portion in a sipe region from the ridge to the concave ridge coincides with a top portion protruding toward the land surface of the ridge .
前記サイプの何れか一方の内壁面には、サイプ幅方向に延びるジグザグ状又は波状の凸条及び凹条を備え、他方の内壁面には前記凸条に係合可能な凹条及び前記凹条に係合可能な凸条を備える請求項1記載の空気入りタイヤ。   Either one of the inner walls of the sipe is provided with zigzag-like or wavy ridges and ridges extending in the sipe width direction, and the other inner wall surface is engaged with the ridges and the ridges. The pneumatic tire according to claim 1, further comprising a ridge that can be engaged with the tire. 最も深い部分のサイプ領域は、平面サイプで形成されている請求項1又は2に記載の空気入りタイヤ。   The pneumatic tire according to claim 1 or 2, wherein the deepest sipe region is formed by a plane sipe.
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JP5249627B2 (en) * 2008-04-25 2013-07-31 株式会社ブリヂストン Pneumatic tire
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