JP2007245822A - Tire for agriculture - Google Patents

Tire for agriculture Download PDF

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Publication number
JP2007245822A
JP2007245822A JP2006069498A JP2006069498A JP2007245822A JP 2007245822 A JP2007245822 A JP 2007245822A JP 2006069498 A JP2006069498 A JP 2006069498A JP 2006069498 A JP2006069498 A JP 2006069498A JP 2007245822 A JP2007245822 A JP 2007245822A
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lug
groove
tire
specified
agricultural
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Eiji Koyama
栄治 小山
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Priority to JP2006069498A priority Critical patent/JP2007245822A/en
Publication of JP2007245822A publication Critical patent/JP2007245822A/en
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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
    • B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
    • B60C11/0316—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation further characterised by the groove cross-section

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire for agriculture capable of reducing vibration in travelling, etc. by reducing a rigidity difference between a part on the equatorial surface side of a lug and a part on the side wall part side. <P>SOLUTION: A groove 12 having specified depth is formed along the cross direction X of a tire main body 2 on a rear surface 8 of the lug 4, relation of 0.3W≤B≤O.7W holds good when length of the groove in the cross direction X of the tire main body 2 is specified as B and length in the cross direction X of the lug 4 is specified as W, relation of 0.1D≤C≤0.3D holds good when a constant distance from a top surface 9 of the lug 4 to the groove 12 is specified as C and height on an outside surface of the lug 4 is specified as D, relation of 0.2F≤E≤0.3F holds good when depth of the groove is specified as E and length of the top surface 9 of the lug 4 is specified as F and relation of 0.02D≤G≤0.04D holds good when width of the groove is specified as G. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、例えばトラクタ等の農作業用車両に用いられる農業用タイヤに関する。   The present invention relates to an agricultural tire used for an agricultural vehicle such as a tractor.

従来、農業用タイヤには、圃場等で十分な牽引力を発揮できるように、トレッド面に複数のラグが突出して形成されている（例えば特許文献１参照）。
これらのラグは、タイヤのサイドウォール部から赤道面にわたって設けられており、それぞれタイヤの周方向に間隔をおいて形成されている。
例えば、特許文献１の図１に示すように、農業用タイヤのトレッド面は、タイヤの半径方向外方に凸となるように形成されている。このようなトレッド面に形成されたラグは、赤道面に近い部分においてラグ頂面とトレッド面との距離が短く、赤道面からサイドウォール部に向かうにつれて、ラグの頂面からトレッド面までの距離が大きくなっている。すなわち、従来の農業用タイヤのラグは、赤道面からサイドウォール部に向かうにつれて、その頂面とトレッド面との距離が徐徐に大きくなるような形状になっている。
特開２００４−１８２０４３号公報 2. Description of the Related Art Conventionally, a plurality of lugs project from a tread surface so that a sufficient traction force can be exhibited in agricultural fields or the like in agricultural tires (see, for example, Patent Document 1).
These lugs are provided from the sidewall portion of the tire to the equator plane, and are formed at intervals in the circumferential direction of the tire.
For example, as shown in FIG. 1 of Patent Document 1, the tread surface of an agricultural tire is formed to be convex outward in the radial direction of the tire. The lug formed on such a tread surface has a short distance between the top surface of the lug and the tread surface near the equator surface, and the distance from the top surface of the lag to the tread surface as it goes from the equator surface to the sidewall portion. Is getting bigger. That is, the lugs of conventional agricultural tires are shaped so that the distance between the top surface and the tread surface gradually increases from the equator surface toward the sidewall portion.
JP 2004-182043 A

従来の農業用タイヤは、赤道面からサイドウォール部に向かうにつれて、ラグ頂面からトレッド面までの距離が徐徐に大きくなっていたため、赤道面からサイドウォール部に向かうにつれて、ラグに用いれるゴム量が多くなっている。
このようなラグは、タイヤ赤道面側近傍の部分よりも、サイドウォール部側の部分の方が剛性が高いものとなる。 In conventional agricultural tires, the distance from the top surface of the lug to the tread surface gradually increased from the equator surface to the sidewall portion. Has increased.
Such lugs have higher rigidity in the side wall portion than in the vicinity of the tire equatorial plane side.

このような場合、ラグには、赤道面側の部分と、サイドウォール部側の部分とに剛性差があり、これが原因となって、走行時に振動や突き上げが生じて乗り心地が悪くなるおそれがあった。
そこで、本発明は、ラグの赤道面側の部分とサイドウォール部側の部分との剛性差を小さくして、走行時の振動等を低減できる農業用タイヤを提供することを目的とする。 In such a case, there is a difference in rigidity between the equatorial plane side portion and the side wall portion side portion of the lug, which may cause vibration and push-up during traveling, resulting in poor ride comfort. there were.
Then, an object of this invention is to provide the agricultural tire which can reduce the vibration etc. at the time of driving | running | working by making small the rigidity difference of the part by the side of the equatorial plane and side wall part of a lug.

本発明は上記の課題を解決するために以下の技術的手段を講じた。
すなわち、タイヤ本体のトレッド面に複数のラグが周方向に間隔をおいて設けられた農業用タイヤにおいて、前記ラグは、タイヤ本体のサイドウォール部から赤道面にわたって形成されており、このラグの後面には、所定の深さを有する溝がタイヤ本体の幅方向に沿って形成されており、タイヤ本体の幅方向における溝の長さをＢとし、ラグの幅方向における長さをＷとしたとき、０．３Ｗ≦Ｂ≦０．７Ｗの関係にあり、ラグの頂面から溝までの一定距離をＣとし、ラグの外側面における高さをＤとしたとき、０．１Ｄ≦Ｃ≦０．３Ｄの関係にあり、溝の深さをＥとし、タイヤ本体の周方向におけるラグの頂面の長さをＦとしたとき、０．２Ｆ≦Ｅ≦０．３Ｆの関係にあり、溝の幅をＧとしたとき、０．０２Ｄ≦Ｇ≦０．０４Ｄの関係にあることを特徴とする。 In order to solve the above problems, the present invention has taken the following technical means.
That is, in the agricultural tire in which a plurality of lugs are provided on the tread surface of the tire body at intervals in the circumferential direction, the lugs are formed from the sidewall portion of the tire body to the equator plane, and the rear surface of the lugs The groove having a predetermined depth is formed along the width direction of the tire body, and when the length of the groove in the width direction of the tire body is B and the length of the lug in the width direction is W 0.3 W ≦ B ≦ 0.7 W, where C is a constant distance from the top surface of the lug to the groove and D is the height of the outer surface of the lug, and 0.1 D ≦ C ≦ 0. 3D relationship, where the depth of the groove is E and the length of the top surface of the lug in the circumferential direction of the tire body is F, the relationship is 0.2F ≦ E ≦ 0.3F, and the width of the groove Where G is 0.02D ≦ G ≦ 0.04D And wherein the door.

これによれば、ラグの後面にサイドウォール部から幅方向の中途部にかけて、所定の溝深さＥ、溝長さＢ、溝幅Ｇの溝を形成することによって、ラグの赤道面側の部分とラグのサイドウォール部側の部分との剛性差を小さくすることができる。したがって、ラグの剛性を均等化して、走行時の振動や突き上げ等を可及的に低減できる。
また、本発明に係る農業用タイヤは、前記溝の深さ方向と、タイヤ本体の半径方向とがなす角度θとしたとき、８０°≦θ≦１００°の関係にあることを特徴とする。 According to this, by forming a groove having a predetermined groove depth E, groove length B, and groove width G from the sidewall portion to the middle portion in the width direction on the rear surface of the lug, a portion on the equatorial plane side of the lug is formed. And the rigidity difference between the lug on the side wall portion side can be reduced. Accordingly, the rigidity of the lugs can be equalized, and vibrations and push-ups during traveling can be reduced as much as possible.
Further, the agricultural tire according to the present invention is characterized in that a relationship of 80 ° ≦ θ ≦ 100 ° is established when an angle θ formed by the depth direction of the groove and the radial direction of the tire body is set.

これによれば、溝の深さ方向とタイヤ本体の半径方向とがなす角度θを所定の範囲内で形成することによって、ラグのサイドウォール部側の剛性を低下させて、ラグの赤道面側の部分との剛性差を可及的に小さくでき、振動や突き上げを低減できる。   According to this, by forming the angle θ formed by the depth direction of the groove and the radial direction of the tire body within a predetermined range, the rigidity on the side wall portion side of the lug is reduced, and the equatorial plane side of the lug The difference in rigidity with the part can be made as small as possible, and vibration and push-up can be reduced.

本発明によれば、ラグの赤道面側の部分とサイドウォール部側の部分との剛性差を小さくして、走行時の振動等を低減できる。   ADVANTAGE OF THE INVENTION According to this invention, the vibration etc. at the time of driving | running | working can be reduced by making small the rigidity difference of the part of the equatorial plane side of a lug, and the part of a side wall part side.

以下、本発明を実施するための最良の形態を図面を参照しながら説明する。
図１〜３に示すように、本発明に係る農業用タイヤ１は、タイヤ本体２のトレッド面３に複数のラグ４を突出して形成したものである。農業用タイヤ１は、トラクタ等の車両に装着された状態において、図３、図４の矢印Ａの方向に回転（以下、この方向の回転を前回転という）したときに前進するようになっている。 The best mode for carrying out the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 3, the agricultural tire 1 according to the present invention is formed by projecting a plurality of lugs 4 on a tread surface 3 of a tire body 2. The agricultural tire 1 moves forward when rotated in the direction of arrow A in FIGS. 3 and 4 (hereinafter, this direction of rotation is referred to as pre-rotation) in a state where it is mounted on a vehicle such as a tractor. Yes.

前記ラグ４は、ゴム製で、タイヤ本体２の周方向（以下、単に、「周方向」という）に間隔をおいて形成されている。ここで、「周方向」とは、タイヤ本体２の円周方向をいう。なお、この実施の形態において、「幅方向」とは、タイヤ本体２の回転軸に平行な方向（図１において符号Ｘで示す方向）をいう。また、タイヤ本体２の半径方向（図２において符号Ｒで示す方向）において、回転軸（回転中心）に向かう方向を径方向内方といい、反対の方向を径方向外方という。   The lugs 4 are made of rubber and are formed at intervals in the circumferential direction of the tire body 2 (hereinafter simply referred to as “circumferential direction”). Here, the “circumferential direction” refers to the circumferential direction of the tire body 2. In this embodiment, the “width direction” refers to a direction parallel to the rotation axis of the tire body 2 (a direction indicated by a symbol X in FIG. 1). Further, in the radial direction of the tire body 2 (the direction indicated by R in FIG. 2), a direction toward the rotation axis (rotation center) is referred to as a radially inward direction, and the opposite direction is referred to as a radially outward direction.

前記ラグ４は、タイヤ本体２の一方のサイドウォール部５ａから赤道面ＥＰにわたって形成された第１ラグ４ａと、他方のサイドウォール部５ｂから赤道面ＥＰにわたって形成された第２ラグ４ｂを有している。第１ラグ４ａと第２ラグ４ｂは周方向に交互に形成されている。
各ラグ４（４ａ、４ｂ）は、図２、図３に示すように、側面視において台形状とされ、その基部から先端部に向かうにつれて先細り状となるように形成されている。 The lug 4 has a first lug 4a formed from one sidewall portion 5a of the tire body 2 to the equator plane EP, and a second lug 4b formed from the other sidewall portion 5b to the equator plane EP. ing. The first lugs 4a and the second lugs 4b are alternately formed in the circumferential direction.
As shown in FIGS. 2 and 3, each lug 4 (4a, 4b) has a trapezoidal shape when viewed from the side, and is formed so as to taper from the base toward the tip.

前記ラグ４（４ａ、４ｂ）は、図２に示すように、側面視において、２つの立面７、８を有している。以下、これらの立面７、８のうち、前回転方向Ａ側の面を前面７といい、反対側の面を後面８という。
前面７と後面８はタイヤ本体２の法線方向（側面視において、タイヤ本体２の半径方向Ｒに直交する方向をいう。図２において符号Ｙで示す）に対して所定の角度で傾斜して形成されている（以下、この角度を傾斜角αという）。図２に示すように、ラグ４の前面７の傾斜角α１は、後面８の傾斜角α２よりも小さくされている。 As shown in FIG. 2, the lug 4 (4 a, 4 b) has two elevation surfaces 7, 8 in a side view. Hereinafter, of these standing surfaces 7 and 8, the surface on the front rotation direction A side is referred to as a front surface 7, and the opposite surface is referred to as a rear surface 8.
The front surface 7 and the rear surface 8 are inclined at a predetermined angle with respect to a normal direction of the tire body 2 (in a side view, a direction orthogonal to the radial direction R of the tire body 2, indicated by a symbol Y in FIG. 2). (Hereinafter, this angle is referred to as an inclination angle α). As shown in FIG. 2, the inclination angle α1 of the front surface 7 of the lug 4 is smaller than the inclination angle α2 of the rear surface 8.

この前面７と後面８の間でかつラグ４の突端には、タイヤ本体２の周方向に所定の長さＦを有する面（以下、この面をラグ４の頂面９という）が形成されている。ラグ４の頂面９は、図１に示すように、中途部がタイヤ本体２の幅方向Ｘとほぼ平行な平坦面とされている。また、ラグ４の頂面９のサイドウォール部５側の端部には、タイヤ本体２の幅方向Ｘに対して所定の角度で径方向内方に傾斜する傾斜面部１１が形成されている。   A surface having a predetermined length F in the circumferential direction of the tire body 2 (hereinafter, this surface is referred to as a top surface 9 of the lug 4) is formed between the front surface 7 and the rear surface 8 and at the protruding end of the lug 4. Yes. As shown in FIG. 1, the top surface 9 of the lug 4 is a flat surface whose midway portion is substantially parallel to the width direction X of the tire body 2. Further, an inclined surface portion 11 that is inclined inward in the radial direction at a predetermined angle with respect to the width direction X of the tire body 2 is formed at the end portion of the top surface 9 of the lug 4 on the side wall portion 5 side.

図４に示すように、平面視において、各ラグ４（４ａ、４ｂ）は、赤道面ＥＰに対して所定の角度で交差するように傾斜して形成されている。また、各ラグ４（４ａ、４ｂ）は、その中途部で折れ曲がり状に形成されている。各ラグ４（４ａ、４ｂ）は、図４に示す折曲点Ｊの１箇所で折れ曲がり状とされている。
タイヤ本体２のトレッド面３は、図１に示すように、径方向外方に向かって凸となるように膨出して形成されている。一方、ラグ４の頂面９は、その中途部がタイヤ本体２の幅方向Ｘとほぼ平行となるように形成されている。 As shown in FIG. 4, each lug 4 (4a, 4b) is formed to be inclined so as to intersect the equator plane EP at a predetermined angle in plan view. Moreover, each lug 4 (4a, 4b) is formed in the bent shape in the middle part. Each lug 4 (4a, 4b) is bent at one of the bending points J shown in FIG.
As shown in FIG. 1, the tread surface 3 of the tire body 2 is formed to bulge out so as to protrude outward in the radial direction. On the other hand, the top surface 9 of the lug 4 is formed so that the midway portion thereof is substantially parallel to the width direction X of the tire body 2.

したがって、タイヤ本体２の半径方向Ｒにおけるラグ４の頂面９とトレッド面３との距離は、赤道面ＥＰに近づくにつれて小さくなり、また、サイドウォール部５（５ａ、５ｂ）に近づくにつれて大きくなる。すなわち、ラグ４は、赤道面ＥＰからサイドウォール部５（５ａ、５ｂ）に向かうにつれて、そのゴムの量が徐徐に多くなるような形状になっている。   Accordingly, the distance between the top surface 9 of the lug 4 and the tread surface 3 in the radial direction R of the tire main body 2 decreases as the equator plane EP is approached, and increases as the sidewall portion 5 (5a, 5b) is approached. . That is, the lug 4 has a shape such that the amount of rubber gradually increases from the equatorial plane EP toward the sidewall portion 5 (5a, 5b).

図１〜３に示すように、ラグ４の後面８には所定の溝深さＥおよび溝幅Ｇの溝１２が形成されている。この溝１２は、ラグ４のサイドウォール部５側の端部から幅方向Ｘにおけるラグ４の中途部まで形成されている。以下、この溝１２の幅方向Ｘにおける長さを溝長さＢという。
この溝１２が所定の溝幅Ｇおよび所定に溝深さＥで形成されることにより、この溝１２の径方向外方側と、径方向内方側とに互いに対向する壁面１３、１４が形成される。以下、径方向外方側の壁面を上面１３といい、径方向内方側の壁面を下面１４という。 As shown in FIGS. 1 to 3, a groove 12 having a predetermined groove depth E and a groove width G is formed on the rear surface 8 of the lug 4. The groove 12 is formed from the end of the lug 4 on the side wall 5 side to the middle of the lug 4 in the width direction X. Hereinafter, the length in the width direction X of the groove 12 is referred to as a groove length B.
By forming the groove 12 with a predetermined groove width G and a predetermined groove depth E, wall surfaces 13 and 14 facing each other on the radially outer side and the radially inner side of the groove 12 are formed. Is done. Hereinafter, the radially outer wall surface is referred to as an upper surface 13, and the radially inner wall surface is referred to as a lower surface 14.

上面１３と下面１４は、タイヤ本体２の半径方向Ｒで互いに対向するように形成されている。また、上面１３および下面１４は、側面視において、ラグ４のサイドウォール部５側の端部の縁が直線状となるように形成されている。上面１３と下面１４は、側面視において、ほぼ平行に形成されている。
図２に示すように、溝１２の底部は、側面視において円弧状に形成されている。上面１３と下面１４は、側面視円弧状の曲面１５によってつながっている。 The upper surface 13 and the lower surface 14 are formed to face each other in the radial direction R of the tire body 2. Moreover, the upper surface 13 and the lower surface 14 are formed so that the edge of the edge part by the side of the side wall part 5 of the lug 4 may become linear form in side view. The upper surface 13 and the lower surface 14 are formed substantially parallel in a side view.
As shown in FIG. 2, the bottom of the groove 12 is formed in an arc shape in a side view. The upper surface 13 and the lower surface 14 are connected by a curved surface 15 having an arc shape in a side view.

前記溝１２は、ラグ４の頂面９から一定の間隔（距離）で離間されて形成されている。以下、ラグ４の頂面９から溝１２までの距離を離間距離Ｃという。
この溝１２の溝１２は、ラグ４の頂面９の中途部とほぼ平行となるような直線部１２ａと、ラグ４の頂面９の傾斜面部１１とほぼ平行となるように、径方向内方側に傾斜した傾斜部１２ｂを有する。 The groove 12 is formed so as to be separated from the top surface 9 of the lug 4 at a constant interval (distance). Hereinafter, the distance from the top surface 9 of the lug 4 to the groove 12 is referred to as a separation distance C.
The groove 12 of the groove 12 is radially inward so as to be substantially parallel to the straight portion 12a that is substantially parallel to the middle portion of the top surface 9 of the lug 4 and the inclined surface portion 11 of the top surface 9 of the lug 4. It has the inclination part 12b inclined to the side.

このように、ラグ４の後面８に溝１２を形成することによって、ゴム量の少ない赤道面ＥＰ側の部分に対して、ゴム量の多いサイドウォール部５側の部分の剛性を小さくできる。農業用タイヤ１は、走行中にラグ４が接地したときに、この溝１２の部分では、上面１３と下面１４が接近するように弾性変形する。この弾性変形は、剛性の小さいラグ４の赤道面ＥＰ側の部分とほぼ同程度の弾性変形となり、ラグ４は全体的にバランス良く走行時の振動を吸収できる。   In this way, by forming the groove 12 on the rear surface 8 of the lug 4, the rigidity of the portion on the side wall portion 5 side with a large amount of rubber can be made smaller than the portion on the equatorial plane EP side with a small amount of rubber. The agricultural tire 1 is elastically deformed so that the upper surface 13 and the lower surface 14 approach each other at the groove 12 when the lug 4 is grounded during traveling. This elastic deformation becomes substantially the same elastic deformation as the portion of the lug 4 with low rigidity on the equatorial plane EP side, and the lug 4 can absorb vibration during traveling with a good balance as a whole.

したがって、本発明に係る農業用タイヤ１は、従来のような、ラグ４の赤道面ＥＰ側の部分とサイドウォール部５側の部分の剛性差が大きいことによる走行時の振動、突き上げ等を可及的に低減できる。
また、ラグ４をサイドウォール部５側の剛性と、赤道面ＥＰ側の部分の剛性との剛性差
を小さくすべく、サイドウォール部５側の部分のゴム量を少なくするようにラグ４の形状を形成することも考えられるが、これに比較して、本発明は、ラグ４の後面８に溝１２を形成するだけでよいので、製品のコストアップ抑制、ゴム型設備費用の大幅な抑制、農耕地の走行の際における牽引力、耐摩耗性等の諸機能をそのまま発揮できる、急な改善要求に対しても短期間で対応できる、等の利点がある。 Therefore, the agricultural tire 1 according to the present invention is capable of vibration, push-up and the like during traveling due to a large difference in rigidity between the equatorial plane EP side portion of the lug 4 and the side wall portion 5 side as in the past. It can be reduced as much as possible.
Further, the shape of the lug 4 is reduced so that the rubber amount of the portion on the side of the side wall 5 is reduced so that the difference in rigidity between the side of the lug 4 on the side of the side wall 5 and the stiffness on the side of the equatorial plane EP is reduced. However, in comparison with this, the present invention only needs to form the groove 12 on the rear surface 8 of the lug 4. There are advantages that various functions such as traction force and wear resistance when traveling on agricultural land can be exhibited as they are, and that sudden improvement requests can be dealt with in a short period of time.

本発明に係る農業用タイヤ１について、溝幅Ｇ、溝長さＢ、溝深さＥ、ラグ４の頂面９の離間距離Ｃ等の値の異なる複数の実施例、比較例を製造し、これらを農作業用車両に装着して試乗し、乗り心地を測定した（実車のフィーリングテスト）。その結果を表１に示す。
なお、乗り心地の測定は、ラグ４に溝１２が形成されていない農業用タイヤの乗り心地を１００（比較例１）として指数化し、これと実施例および比較例とを比較することにより行った。 About the agricultural tire 1 according to the present invention, a plurality of examples having different values such as a groove width G, a groove length B, a groove depth E, a separation distance C of the top surface 9 of the lug 4, and comparative examples are manufactured. These were mounted on agricultural vehicles and tested, and the ride comfort was measured (feeling test on actual vehicles). The results are shown in Table 1.
In addition, the measurement of riding comfort was performed by indexing the riding comfort of the agricultural tire in which the groove 12 is not formed in the lug 4 as 100 (Comparative Example 1), and comparing this with the Examples and Comparative Examples. .

なお、溝長さＢは、ラグ４の幅方向Ｘにおける長さＷとの比で表し、溝幅Ｇ、および溝１２のラグ４の頂面９からの離間距離Ｃは、ラグ４の外側面におけるラグ高さＤ（タイヤ本体２のショルダーエッジ部６からラグ４の頂面９までの高さをいう。）との比で表している。また、溝深さＥは、ラグ４の頂面９の幅方向Ｘにおける長さＦとの比で表している。
The groove length B is expressed as a ratio to the length W in the width direction X of the lug 4, and the groove width G and the distance C from the top surface 9 of the lug 4 of the groove 12 are the outer surface of the lug 4. Is expressed as a ratio to the lug height D (referred to as the height from the shoulder edge portion 6 of the tire body 2 to the top surface 9 of the lug 4). Further, the groove depth E is represented by a ratio with the length F in the width direction X of the top surface 9 of the lug 4.

Figure 2007245822
Figure 2007245822

表１から明らかなように、ラグ４の溝長さＢは、ラグ４の幅方向Ｘにおける長さをＷとしたとき、０．３Ｗ≦Ｂ≦０．７Ｗの範囲内とされるのが望ましい。Ｂ＞０．７Ｗとなると、ラグの剛性の小さな部分にまで溝１２が形成されることになり、溝１２の長さが長すぎて、ラグ剛性が均一化しないことから必要以上に屈曲運動が引き起こり、乗り心地が悪化するおそれがある。Ｂ＜０．３Ｗになると、溝の幅方向Ｘの範囲が狭く、ゴムの量が多いサイドウォール部５側のラグ４部分の剛性が低下しにくくなると考えられる。    As is clear from Table 1, the groove length B of the lug 4 is preferably in the range of 0.3 W ≦ B ≦ 0.7 W, where W is the length in the width direction X of the lug 4. . When B> 0.7 W, the groove 12 is formed even in a portion where the rigidity of the lug is small. Since the length of the groove 12 is too long and the lug rigidity is not uniform, bending motion is more than necessary. This may cause the ride comfort to deteriorate. If B <0.3W, it is considered that the rigidity of the lug 4 portion on the side wall portion 5 side where the range in the width direction X of the groove is narrow and the amount of rubber is large is less likely to decrease.

また、ラグ４の頂面９の中途部（直線状の平坦面部）からの離間距離Ｃは、ラグ高さＤとの関係において、０．１Ｄ≦Ｃ≦０．３Ｄの範囲内とされるのが望ましい。Ｃ＞０．３Ｄの場合、溝１２の位置がラグ４の頂面９から離れてしまい、溝１２部分での所望の弾性変形がなされない。Ｃ＜０．１Ｄの場合、溝１２がラグ４の頂面９に近すぎて、十分な振動低減効果が得られない。また、ラグ４の頂部の摩耗によって溝１２が消失することも考えられる。   Further, the distance C from the midway portion (straight flat surface portion) of the top surface 9 of the lug 4 is within the range of 0.1D ≦ C ≦ 0.3D in relation to the lug height D. Is desirable. In the case of C> 0.3D, the position of the groove 12 is separated from the top surface 9 of the lug 4 and the desired elastic deformation at the groove 12 portion is not performed. In the case of C <0.1D, the groove 12 is too close to the top surface 9 of the lug 4 and a sufficient vibration reducing effect cannot be obtained. It is also conceivable that the groove 12 disappears due to wear of the top of the lug 4.

また、溝深さＥは、ラグ４の頂面９における周方向の長さＦとの関係において、０．２Ｆ≦Ｅ≦０．３Ｆの範囲内とされるのが望ましい。Ｅ＞０．３Ｆの場合、溝深さＥが深すぎて、タイヤにひねりが加わった場合等に、ゴム割れ、亀裂等が発生しやすくなる。また、必要以上にラグ４のサイドウォール部５側の部分の剛性が低下してしまい、走行時の振動低減効果を発揮しにくくなる。Ｅ＜０．２Ｆとなると溝深さＥが浅すぎて、ラグ４のサイドウォール部５側の部分の剛性が低下しにくくなることが考えられる。   In addition, the groove depth E is preferably in the range of 0.2F ≦ E ≦ 0.3F in relation to the circumferential length F of the top surface 9 of the lug 4. In the case of E> 0.3F, when the groove depth E is too deep and the tire is twisted, rubber cracks, cracks and the like are likely to occur. In addition, the rigidity of the lug 4 on the side wall 5 side is lowered more than necessary, and it is difficult to exhibit the vibration reduction effect during traveling. If E <0.2F, it is considered that the groove depth E is too shallow, and the rigidity of the lug 4 on the side wall 5 side is unlikely to decrease.

また、溝幅Ｇとラグ高さＤの関係は、０．０２Ｄ≦Ｇ≦０．０４Ｄの範囲内とされるのが望ましい。Ｇ＞０．０４Ｄとなると、溝１２が大きくなりすぎて、走行中の溝１２部分が大きく弾性変形することにより、乗り心地が悪化するおそれがある。Ｇ＜０．０２Ｄとなると、溝１２が小さすぎて、走行中の溝１２部分の弾性変形量が小さく、農業用タイヤ１は、十分な振動低減効果を発揮できないことが考えられる。   The relationship between the groove width G and the lug height D is preferably in the range of 0.02D ≦ G ≦ 0.04D. If G> 0.04D, the groove 12 becomes too large, and the traveling groove 12 portion is greatly elastically deformed, which may deteriorate the riding comfort. When G <0.02D, it is considered that the groove 12 is too small and the amount of elastic deformation of the running groove 12 is small, and the agricultural tire 1 cannot exhibit a sufficient vibration reducing effect.

前記溝１２の深さ方向と、タイヤ本体２の半径方向Ｒとがなす角度θとしたとき（以下、溝１２の形成角度θという）、８０°≦θ≦１００°の関係にあるのが望ましく、さらに好ましくは、θ＝９０°とされるのがよい。これによって、溝１２の部分において、上面１３と下面１４が接近するような所望の弾性変形が可能になり、この弾性変形が、剛性の小さいラグ４の赤道面ＥＰ側の部分とほぼ同程度の弾性変形となり、ラグ４は全体的にバランス良く走行時の振動を吸収できるようになる。
ここで、溝１２の深さ方向とは、側面視において直線状とされている上面１３の直線方向をいう（図２において符号Ｚで示す方向）をいう。この深さ方向Ｚは、上面１３が向く方向に限らず、例えば、側面視において直線状の下面１４が向く直線方向を用いてもよい。 When the angle θ formed by the depth direction of the groove 12 and the radial direction R of the tire body 2 (hereinafter referred to as the formation angle θ of the groove 12), it is desirable that the relationship is 80 ° ≦ θ ≦ 100 °. More preferably, θ = 90 °. As a result, desired elastic deformation such that the upper surface 13 and the lower surface 14 approach each other in the portion of the groove 12 is possible, and this elastic deformation is approximately the same as the portion on the equatorial plane EP side of the lug 4 with low rigidity. The lug 4 can absorb vibration during traveling with a good balance as a whole due to elastic deformation.
Here, the depth direction of the groove 12 refers to a linear direction of the upper surface 13 that is linear in a side view (a direction indicated by a symbol Z in FIG. 2). The depth direction Z is not limited to the direction in which the upper surface 13 faces, and for example, a linear direction in which the linear lower surface 14 faces in a side view may be used.

なお、本発明は上記の実施の形態に限らず、種々の変更・変形が可能である。
例えば、溝１２の上面１３および下面１４は、側面視において、直線状で互いにほぼ平行なものを例示したが、上面１３および下面１４は、直線状でなくともよく、例えば曲線状のものであってもよく、互いに平行とされていなくてもよい。上面１３、下面１４が側面視で曲線状に形成されている場合には、溝１２の側面視における中心線が向く方向を、溝１２深さ方向Ｚとすることができる。 The present invention is not limited to the above-described embodiment, and various changes and modifications can be made.
For example, the upper surface 13 and the lower surface 14 of the groove 12 are linear and substantially parallel to each other in a side view, but the upper surface 13 and the lower surface 14 do not have to be linear, for example, are curved. It does not have to be parallel to each other. When the upper surface 13 and the lower surface 14 are formed in a curved shape in a side view, the direction in which the center line in the side view of the groove 12 faces can be the depth direction Z of the groove 12.

上記の実施の形態では、第１ラグ４ａと第２ラグ４ｂが周方向に間隔をおいて交互に形成された農業用タイヤ１を例示したが、これに限らず、他の種々のラグパターンの農業用タイヤ１にも本発明を適用できる。また、農業用タイヤ１は、トラクタ等の走行車両のみならず、その他の農業機械用としてもよい。
上記の実施の形態では、ラグ４が１箇所の折曲点Ｊで折れ曲がり状のものを例示したが、これに限らず、複数箇所で折れ曲がり状のもの、直線状のものその他の形状のラグ４にも本発明を適用可能である。 In the above embodiment, the agricultural tire 1 in which the first lugs 4a and the second lugs 4b are alternately formed at intervals in the circumferential direction is illustrated. However, the present invention is not limited thereto, and other various lug patterns may be used. The present invention can also be applied to the agricultural tire 1. The agricultural tire 1 may be used not only for traveling vehicles such as tractors but also for other agricultural machines.
In the above embodiment, the lug 4 is bent at one bending point J. However, the lug 4 is not limited to this, and the lug 4 is bent at a plurality of points, linear, or other shape. The present invention can also be applied to.

また、上記の実施の形態では、ラグ４がタイヤ本体２のサイドウォール部５から赤道面ＥＰにわたって形成されているものを例示したが、これに限らず、ラグ４が赤道面ＥＰまで達していない場合についても本発明を適用可能である。   Moreover, in said embodiment, although the lug 4 illustrated what was formed over the equatorial plane EP from the sidewall part 5 of the tire main body 2, not only this but the lug 4 has not reached the equatorial plane EP. The present invention can also be applied to cases.

本発明は、トラクタ等の農作業用の車両の車輪に利用できる。   The present invention can be used for wheels of agricultural vehicles such as tractors.

本発明の実施の形態に係る農業用タイヤの一部縦断面図である。It is a partial longitudinal cross-sectional view of the agricultural tire which concerns on embodiment of this invention. 同じくラグの側面図である。It is a side view of a lug similarly. 本発明に係る農業用タイヤの側面図である。1 is a side view of an agricultural tire according to the present invention. 本発明に係る農業用タイヤの平面図である。1 is a plan view of an agricultural tire according to the present invention.

符号の説明Explanation of symbols

１ 農業用タイヤ
２ タイヤ本体
３ トレッド面
４ ラグ
５ サイドウォール部
８ ラグの後面
１２ 溝 DESCRIPTION OF SYMBOLS 1 Agricultural tire 2 Tire main body 3 Tread surface 4 Lug 5 Side wall part 8 Rug rear surface 12 Groove

Claims (2)

タイヤ本体のトレッド面に複数のラグが周方向に間隔をおいて設けられた農業用タイヤにおいて、
前記ラグは、タイヤ本体のサイドウォール部から赤道面にわたって形成されており、このラグの後面には、所定の深さを有する溝がタイヤ本体の幅方向に沿って形成されており、
タイヤ本体の幅方向における溝の長さをＢとし、ラグの幅方向における長さをＷとしたとき、０．３Ｗ≦Ｂ≦０．７Ｗの関係にあり、
ラグの頂面から溝までの一定距離をＣとし、ラグの外側面における高さをＤとしたとき、０．１Ｄ≦Ｃ≦０．３Ｄの関係にあり、
溝の深さをＥとし、タイヤ本体の周方向におけるラグの頂面の長さをＦとしたとき、０．２Ｆ≦Ｅ≦０．３Ｆの関係にあり、
溝の幅をＧとしたとき、０．０２Ｄ≦Ｇ≦０．０４Ｄの関係にあることを特徴とする農業用タイヤ。 In the agricultural tire in which a plurality of lugs are provided at intervals in the circumferential direction on the tread surface of the tire body,
The lug is formed from the sidewall portion of the tire body to the equator plane, and on the rear surface of the lug, a groove having a predetermined depth is formed along the width direction of the tire body.
When the length of the groove in the width direction of the tire body is B and the length in the width direction of the lug is W, there is a relationship of 0.3 W ≦ B ≦ 0.7 W,
When the constant distance from the top surface of the lug to the groove is C and the height at the outer surface of the lug is D, the relationship is 0.1D ≦ C ≦ 0.3D,
When the depth of the groove is E and the length of the top surface of the lug in the circumferential direction of the tire body is F, the relationship is 0.2F ≦ E ≦ 0.3F.
An agricultural tire having a relationship of 0.02D ≦ G ≦ 0.04D, where G is the width of the groove. 前記溝の深さ方向と、タイヤ本体の半径方向とがなす角度θとしたとき、８０°≦θ≦１００°の関係にあることを特徴とする請求項１に記載の農業用タイヤ。   2. The agricultural tire according to claim 1, wherein an angle θ formed by a depth direction of the groove and a radial direction of the tire body has a relationship of 80 ° ≦ θ ≦ 100 °.
JP2006069498A 2006-03-14 2006-03-14 Tire for agriculture Pending JP2007245822A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105246712A (en) * 2013-05-28 2016-01-13 株式会社普利司通 Pneumatic radial tire for agricultural vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105246712A (en) * 2013-05-28 2016-01-13 株式会社普利司通 Pneumatic radial tire for agricultural vehicle
US10279632B2 (en) 2013-05-28 2019-05-07 Bridgestone Corporation Pneumatic radial tire for agricultural vehicle

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