JP4864577B2 - Running body with lugs - Google Patents

Running body with lugs Download PDF

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JP4864577B2
JP4864577B2 JP2006189767A JP2006189767A JP4864577B2 JP 4864577 B2 JP4864577 B2 JP 4864577B2 JP 2006189767 A JP2006189767 A JP 2006189767A JP 2006189767 A JP2006189767 A JP 2006189767A JP 4864577 B2 JP4864577 B2 JP 4864577B2
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lug
tire body
recess
tire
length
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JP2008018751A (en
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幸一 中島
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Description

本発明は、湿田、軟弱地等を走行する農業機械等に装着されうるラグ付き走行体に関する。   The present invention relates to a traveling body with a lug that can be mounted on an agricultural machine or the like traveling on a wetland, soft ground, or the like.

従来、この種のラグ付き走行体には、ラグ付きの空気入りタイヤがある。この空気入りタイヤは、左右一対のサイドウォールと、両サイドウォール間に跨るクラウン部とを備え、このクラウン部にその中央部からショルダー部に向かって周方向に対して傾斜して延伸するラグをハの字状に突設したものである（例えば、特許文献１参照）。
前記ラグは、その踏み込み側壁（回転方向前側の側壁）が、その蹴り面側壁（踏み込み側壁の背面側の側壁）よりも緩やかな傾斜で形成されている。タイヤの半径方向に対する踏み込み側壁の傾斜角度は、３０°〜５０°程度となっている。
特開平９−１０９６１７号公報（第３頁段落００１３、図１、図３） Conventionally, this type of lug traveling body includes a pneumatic tire with lug. This pneumatic tire is provided with a pair of left and right sidewalls and a crown portion straddling between both sidewalls, and a lug extending obliquely with respect to the circumferential direction from the central portion toward the shoulder portion on the crown portion. It protrudes in a C-shape (see, for example, Patent Document 1).
The lug is formed such that its stepping side wall (the side wall on the front side in the rotational direction) has a gentler slope than its kick surface side wall (the side wall on the back side of the stepping side wall). The inclination angle of the stepping side wall with respect to the radial direction of the tire is about 30 ° to 50 °.
JP-A-9-109617 (3rd page, paragraph 0013, FIGS. 1 and 3)

従来のラグ付き走行体を農作業機械に装着して水田、湿田等を走行した場合、ラグ付き走行体が十分なトラクションを得られず、スリップ率が増大し、作業中にスタックしてしまうおそれがある。水田等の土は流動的な泥状となっており、踏み込み側壁が緩やかな傾斜で形成されていると、この泥土を掴みにくくなるからである。
本発明はこのような事情に鑑みてなされたものであり、水田等で走行させた場合に十分なトラクション性能を発揮するラグ付き走行体を提供することを目的とする。 When a conventional traveling body with a lug is attached to an agricultural machine and travels in paddy fields, wet fields, etc., the traveling body with a lug cannot obtain sufficient traction, the slip rate increases, and there is a risk of stacking during work. is there. This is because soil such as paddy is in a fluid mud shape, and if the stepping side wall is formed with a gentle slope, it becomes difficult to grasp the mud.
This invention is made | formed in view of such a situation, and it aims at providing the traveling body with a lug which exhibits sufficient traction performance, when it makes it drive | work on a paddy field.

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、本発明に係るラグ付き走行体は、タイヤ本体の一方のサイドウォール部側に片寄って形成された第１ラグと、他方のサイドウォール部側に片寄って形成された第２ラグとがこのタイヤ本体の周方向に交互に形成されており、前記第１ラグは、タイヤ本体の赤道面から一方のサイドウォール部にわたって形成された長ラグ部と、前記赤道面から他方のサイドウォール部に向かって形成された短ラグ部とを有し、前記第２ラグは、タイヤ本体の赤道面から一方のサイドウォール部に向かって形成された短ラグ部と、前記赤道面から他方のサイドウォール部にわたって形成された長ラグ部とを有しており、前記各ラグの前側の側面の上部には、タイヤ本体の半径方向に対して１°〜２５°の範囲の角度で傾斜する傾斜面が形成され、この傾斜面の半径方向の長さは、各ラグの後側の側面の高さの１５％以下とされており、かつ前記傾斜面の下側に、この傾斜面よりも前方に突出する段部が形成され、この段部の下側に所定の深さの凹部が形成され、前記凹部は、その前記半径方向の長さがラグの後側の側面の高さの７０％以上８０％未満のときその深さが前記半径の方向長さの１４％以上であり、その前記半径方向の長さがラグの後側の側面の高さの８０％以上９０％未満のときその深さが前記半径方向の長さの１０％以上であり、その前記半径方向の長さがラグの後側の側面の高さの９０％以上のときその深さが前記半径方向の長さの８％以上である。 In order to solve the above problems, the present invention has taken the following technical means.
That is, in the traveling body with a lug according to the present invention, the first lug formed so as to be offset toward one sidewall portion side of the tire body and the second lug formed so as to be offset toward the other sidewall portion side. The first lugs are alternately formed in the circumferential direction of the tire body, and the first lugs extend from the equatorial plane of the tire body to one side wall portion, and from the equatorial plane to the other side wall portion. A short lug portion formed from the equatorial plane of the tire body toward the one sidewall portion, and the second lug extending from the equatorial plane to the other sidewall portion. An inclined surface that is inclined at an angle in the range of 1 ° to 25 ° with respect to the radial direction of the tire body is formed on an upper portion of the front side surface of each lug. This inclination The length of the slope in the radial direction is 15% or less of the height of the rear side surface of each lug, and a step portion that protrudes forward from the inclined surface is formed below the inclined surface. is, the predetermined depth recess of the lower side of the stepped portion is formed, said recess, when the length of the radial their is less than 80% after the side of more than 70% of the height of the side surfaces of the lugs and the depth of their more than 14% of the length of the said radius, said radial length its depth when the side 80% or more but less than 90% of the height of the side surface after the lugs of that the radial is 10% or more in length, the said radial length its depth when more than 90% of the height of the side surface of the rear side of the lug of that radial length 8 or more percent.

これによれば、各ラグの前側の側面に凹部を形成することにより、ラグ付き走行体は水田、湿田等を走行した場合に、この凹部が土を掴むことで、十分なトラクション性能を発揮できるようになる。また、ラグの前側の側面の上部に傾斜面が形成されているので、ラグ付き走行体は、走行中にこの傾斜面が土中に食い込むことで、トラクション性能を発揮できる。さらに、ラグの前側の側面に前記段部が形成されることで、このラグは、十分な剛性を確保できる。   According to this, by forming a recess in the front side surface of each lug, when the traveling body with a lug travels in a paddy field, a wet field, etc., this recess can grasp the soil, thereby exhibiting sufficient traction performance. It becomes like this. Moreover, since the inclined surface is formed in the upper part of the side surface on the front side of the lug, the traveling body with the lug can exhibit traction performance as the inclined surface bites into the soil during traveling. Furthermore, since the step portion is formed on the front side surface of the lug, the lug can secure sufficient rigidity.

前記第１ラグおよび前記第２ラグは、いずれもその前記長ラグ部と前記短ラグ部とが平面視においてＶ字を形成し前記赤道面に位置する部分が前側となるように配される。
また、前記長ラグ部は、その中途部が赤道面に対して５０°以上に傾斜した傾斜部を備え、この傾斜部に前記凹部が形成されていることを特徴とする。
これによれば、赤道面に対して５０°以上に傾斜した傾斜部に凹部が形成されることで、ラグ付き走行体は、走行中にこの凹部が土を掴むことができ、十分なトラクション性能を発揮できるようになる。 The first lug and the second lug are both arranged such that the long lug portion and the short lug portion form a V shape in a plan view and a portion located on the equatorial plane is on the front side.
Further, the long lug portion includes an inclined portion whose midway portion is inclined at 50 ° or more with respect to the equator plane, and the concave portion is formed in the inclined portion.
According to this, since the concave portion is formed in the inclined portion inclined at an angle of 50 ° or more with respect to the equator plane, the concave portion can grip the soil while traveling, and the traction performance is sufficient. Can be demonstrated.

また、前記凹部は、タイヤ本体の幅方向内方に向かうにつれて徐徐に深くなるように形成されていることを特徴とする。
これによれば、凹部の底部が赤道面に対してより大きな角度で傾斜することになり、ラグ付き走行体のトラクション性能がさらに向上する。
また、前記タイヤ本体のトレッド部に、複数の突起が設けられていることを特徴とする。 Moreover, the said recessed part is formed so that it may become deep gradually gradually as it goes to the width direction inner side of a tire main body.
According to this, the bottom part of a recessed part will incline at a larger angle with respect to an equatorial plane, and the traction performance of a traveling body with a lug further improves.
In addition, a plurality of protrusions are provided on the tread portion of the tire body.

これによれば、トレッド部に泥土が付着しにくくなり、ラグ付き走行体の排土性を向上するとともにラグの牽引力を維持できるようになる。   According to this, it becomes difficult for mud to adhere to the tread portion, and it is possible to improve the soil removal performance of the traveling body with lugs and maintain the traction force of the lugs.

本発明によれば、水田等で走行させた場合に十分なトラクション性能を発揮できる。   According to the present invention, sufficient traction performance can be exhibited when traveling in a paddy field or the like.

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。
本発明に係るラグ付き走行体１は、例えば農作業車両の車輪（農業用タイヤ）として使用されるものである。
図１乃至図４の第１実施形態において、ラグ付き走行体１は、側面視円形のタイヤ本体２のトレッド部３に複数のラグ４を突出して形成されたものである。複数のラグ４は、タイヤ本体２の周方向（図中に符号Ｙで示す）に間隔をおいて形成されている。 The best mode for carrying out the present invention will be described below with reference to the drawings.
The traveling body 1 with a lug according to the present invention is used, for example, as a wheel (agricultural tire) of a farm vehicle.
In the first embodiment of FIGS. 1 to 4, the lug-equipped traveling body 1 is formed by projecting a plurality of lugs 4 on a tread portion 3 of a tire body 2 that is circular in a side view. The plurality of lugs 4 are formed at intervals in the circumferential direction of the tire body 2 (indicated by a symbol Y in the figure).

ここで、「周方向」とは、ラグ付き走行体１がタイヤの場合にはその円周方向をいう。また、この「周方向」は、図１のように平面図で表した場合には、紙面に沿って赤道面ＥＰ（タイヤ本体２の幅方向（図中に符号Ｘで示す）の中心を通るタイヤ本体２の回転軸に直角な面をいう）と平行な直線方向をいう。また、タイヤ本体２の半径方向（図中に符号Ｒで示す）の外方側を上側、内方（タイヤ本体２の中心を向く方向）側を下側という場合がある。   Here, the “circumferential direction” refers to the circumferential direction when the lug traveling body 1 is a tire. Further, this “circumferential direction”, when expressed in a plan view as shown in FIG. 1, passes through the center of the equator plane EP (the tire body 2 in the width direction (indicated by symbol X in the figure)) along the paper surface. A straight direction parallel to the rotation axis of the tire body 2). Further, the outer side of the tire body 2 in the radial direction (indicated by the symbol R in the figure) may be referred to as the upper side, and the inner side (direction facing the center of the tire body 2) may be referred to as the lower side.

図１に示すように、ラグ付き走行体１は、矢印Ａの方向に回転したときに、前進するようになっている。以下、ラグ付き走行体１の前進する回転方向を前方といい、これと反対の方向を後方という。また、ラグ付き走行体１の構成要素の位置を特定するために、このラグ付き走行体１が前方の位置を前側といい、その反対側を後側という。
複数のラグ４には、タイヤ本体２の一方のサイドウォール部５ａに片寄って形成された第１ラグ４ａと、他方のサイドウォール部５ｂに片寄って形成された第２ラグ４ｂとがある。 As shown in FIG. 1, the lug-equipped traveling body 1 moves forward when it rotates in the direction of arrow A. Hereinafter, the rotational direction in which the traveling body 1 with a lug advances is referred to as the front, and the opposite direction is referred to as the rear. Moreover, in order to specify the position of the component of the traveling body 1 with a lug, the position ahead of this traveling body 1 with a lug is called a front side, and the opposite side is called a rear side.
The plurality of lugs 4 include a first lug 4a formed so as to be offset from one sidewall portion 5a of the tire body 2, and a second lug 4b formed so as to be offset from the other sidewall portion 5b.

第１ラグ４ａと第２ラグ４ｂはタイヤ本体２の周方向Ｙに交互に形成されている。第１ラグ４ａと第２ラグ４ｂは同じ形状のものを左右反転したものである。第２ラグ４ｂを左右反転させると第１ラグ４ａと同一形状となる。
第１ラグ４ａおよび第２ラグ４ｂは、長ラグ部７と短ラグ部８を有する。
第１ラグ４ａの長ラグ部７は、タイヤ本体２の赤道面ＥＰからタイヤ本体２の一方のサイドウォール部５ａにわたって形成されている。第２ラグ４ｂの長ラグ部７は、タイヤ本体２の赤道面ＥＰからタイヤ本体２の他方のサイドウォール部５ｂにわたって形成されている。 The first lugs 4 a and the second lugs 4 b are alternately formed in the circumferential direction Y of the tire body 2. The 1st lug 4a and the 2nd lug 4b are what reversed the right and left thing of the same shape. If the 2nd lug 4b is reversed right and left, it will become the same shape as the 1st lug 4a.
The first lug 4 a and the second lug 4 b have a long lug portion 7 and a short lug portion 8.
The long lug portion 7 of the first lug 4 a is formed from the equator plane EP of the tire body 2 to one sidewall portion 5 a of the tire body 2. The long lug portion 7 of the second lug 4b is formed from the equator plane EP of the tire body 2 to the other sidewall portion 5b of the tire body 2.

第１ラグ４ａの長ラグ部７および第２ラグ４ｂの長ラグ部７は図１に示すように、タイヤ本体２の赤道面ＥＰ（または周方向Ｙ）に対して所定の角度で傾斜して形成されている。
図１に示すように、各ラグ４（４ａ、４ｂ）の長ラグ部７は、その中途部が折り曲げられている。これにより、各長ラグ部７は、赤道面ＥＰ側に形成された第１傾斜部９と、第１傾斜部９よりもサイドウォール部５（５ａ、５ｂ）側に形成された第２傾斜部１０を有する。 As shown in FIG. 1, the long lug 7 of the first lug 4a and the long lug 7 of the second lug 4b are inclined at a predetermined angle with respect to the equator plane EP (or circumferential direction Y) of the tire body 2. Is formed.
As shown in FIG. 1, the middle part of the long lug part 7 of each lug 4 (4a, 4b) is bent. Thereby, each long lug part 7 is the 1st inclination part 9 formed in the equatorial plane EP side, and the 2nd inclination part formed in the side wall part 5 (5a, 5b) side rather than the 1st inclination part 9. 10

第１傾斜部９および第２傾斜部１０は、タイヤ本体２の赤道面ＥＰ（または周方向Ｙ）に対して所定の角度で傾斜している。以下、第１傾斜部９の傾斜角度を第１傾斜角度θ１といい、第２傾斜部１０の傾斜角度を第２傾斜角度θ２という。第１傾斜角度θ１は、第２傾斜角度θ２よりも小さい。第１傾斜角度θ１は、２０°以上５０°未満の範囲内に設定されるのが望ましい。第２傾斜角度θ２は５０°以上９０°未満の範囲内に設定されるのが望ましい。   The first inclined portion 9 and the second inclined portion 10 are inclined at a predetermined angle with respect to the equator plane EP (or the circumferential direction Y) of the tire body 2. Hereinafter, the inclination angle of the first inclination portion 9 is referred to as a first inclination angle θ1, and the inclination angle of the second inclination portion 10 is referred to as a second inclination angle θ2. The first inclination angle θ1 is smaller than the second inclination angle θ2. The first inclination angle θ1 is preferably set within a range of 20 ° or more and less than 50 °. The second inclination angle θ2 is desirably set within a range of 50 ° or more and less than 90 °.

第１傾斜部９の一端部は、短ラグ部８とつながっている。図１に示すように、短ラグ部８と長ラグ部７の第１傾斜部９の部分は、平面視においてＶ字状に形成されている。
各ラグ４（４ａ、４ｂ）は、赤道面ＥＰを挟んでタイヤ本体２の幅方向Ｘの一方側に長ラグ部７、他方側に短ラグ部８を有しており、ラグ付き走行体１はラグ４が地面に接したときに機体の荷重を左右のバランス良く支持することができる。これによって、ラグ付き走行体１は、走行中の振動を抑制できるようになっている。 One end portion of the first inclined portion 9 is connected to the short lug portion 8. As shown in FIG. 1, the first lug portion 9 of the short lug portion 8 and the long lug portion 7 is formed in a V shape in plan view.
Each lug 4 (4a, 4b) has a long lug portion 7 on one side in the width direction X of the tire body 2 and a short lug portion 8 on the other side across the equatorial plane EP. Can support the load of the airframe with a good balance between the left and right when the lug 4 contacts the ground. Thereby, the traveling body 1 with a lug can suppress vibration during traveling.

第２ラグ４ｂの短ラグ部８は、タイヤ本体２の赤道面ＥＰからタイヤ本体２の一方のサイドウォール部５ａに向かって形成されている。第１ラグ４ａの短ラグ部８は、タイヤ本体２の赤道面ＥＰからタイヤ本体２の他方のサイドウォール部５ｂに向かって形成されている。第１ラグ４ａの短ラグ部８および第２ラグ４ｂの短ラグ部８は、図１に示すように、赤道面ＥＰ（または周方向Ｙ）に対して所定の角度で傾斜して形成されている。短ラグ部８の傾斜角度θ３は、２０°以上５０°未満とされているのが望ましい。短ラグ部８の傾斜角度θ３は、前記第１傾斜角度θ１とほぼ等しくされるのが望ましい。   The short lug portion 8 of the second lug 4 b is formed from the equatorial plane EP of the tire body 2 toward one sidewall portion 5 a of the tire body 2. The short lug portion 8 of the first lug 4 a is formed from the equatorial plane EP of the tire body 2 toward the other sidewall portion 5 b of the tire body 2. The short lug portion 8 of the first lug 4a and the short lug portion 8 of the second lug 4b are formed to be inclined at a predetermined angle with respect to the equatorial plane EP (or circumferential direction Y), as shown in FIG. Yes. It is desirable that the inclination angle θ3 of the short lug 8 is 20 ° or more and less than 50 °. It is desirable that the inclination angle θ3 of the short lug 8 is substantially equal to the first inclination angle θ1.

第１ラグ４ａおよび第２ラグ４ｂは、タイヤ本体２のトレッド部３の表面（ラグ底）から所定の高さで形成されている。各ラグ４ａ、４ｂは、その先端部に平坦状の頂面１２を有している。前記頂面１２の回りには、トレッド部３の表面から所定の高さで突出された側面１３が形成されている。
各ラグ４（４ａ、４ｂ）の前側の側面１３ａおよび後側の側面１３ｂは、図３に示すように、タイヤ本体２の半径方向Ｒに対して所定の角度で傾斜している。 The first lugs 4 a and the second lugs 4 b are formed at a predetermined height from the surface (lug bottom) of the tread portion 3 of the tire body 2. Each lug 4a, 4b has a flat top surface 12 at its tip. Around the top surface 12, a side surface 13 protruding from the surface of the tread portion 3 at a predetermined height is formed.
The front side surface 13a and the rear side surface 13b of each lug 4 (4a, 4b) are inclined at a predetermined angle with respect to the radial direction R of the tire body 2 as shown in FIG.

図１乃至図４に示すように、各ラグ４（４ａ、４ｂ）の前側の側面１３ａの上部には、タイヤ本体２の半径方向Ｒに対して所定の角度で傾斜する傾斜面１４が形成されている。
図３に示すように、この傾斜面１４の上端は、ラグ４の頂面１２とつながっている。この傾斜面１４は、タイヤ本体２の半径方向Ｒ内方に向かうにつれて前方に徐徐に傾斜するように形成されている。この傾斜面１４の傾斜角度（図３に符号ａで示す）は、１°〜２０°の範囲で設定されることが望ましい。この傾斜面１４のタイヤ本体２の半径方向Ｒにおける長さｂは、各ラグ４（４ａ、４ｂ）の後側の側面１３ｂの高さの１５％以下とされている。 As shown in FIGS. 1 to 4, an inclined surface 14 that is inclined at a predetermined angle with respect to the radial direction R of the tire body 2 is formed on the upper portion of the front side surface 13 a of each lug 4 (4 a, 4 b). ing.
As shown in FIG. 3, the upper end of the inclined surface 14 is connected to the top surface 12 of the lug 4. The inclined surface 14 is formed so as to be gradually inclined forward as it goes inward in the radial direction R of the tire body 2. The inclination angle of the inclined surface 14 (indicated by the symbol a in FIG. 3) is preferably set in the range of 1 ° to 20 °. The length b of the inclined surface 14 in the radial direction R of the tire body 2 is 15% or less of the height of the side surface 13b on the rear side of each lug 4 (4a, 4b).

前記傾斜面１４の下側には、前記傾斜面１４よりも前方に突出する段部１５が形成されている。この段部１５の上端は、前記傾斜面１４の下端とつながっている。この段部１５は、タイヤ本体２の半径方向Ｒに対して所定の角度で傾斜する傾斜面からなる。この段部１５の傾斜角度は、前記傾斜面１４の傾斜角度ａよりも大きい。
各ラグ４（４ａ、４ｂ）の前側の側面１３ａには、所定の深さの凹部１６が形成されている。この凹部１６は、前記段部１５の下側に形成されている。この凹部１６は、各ラグ４の長ラグ部７の第２傾斜部１０の部分に対応した位置に形成されている。図１に示すように、この凹部１６は断面視で、所定の曲率半径による円弧状に形成されている。 A step portion 15 is formed below the inclined surface 14 so as to protrude forward from the inclined surface 14. The upper end of the step portion 15 is connected to the lower end of the inclined surface 14. The step portion 15 includes an inclined surface that is inclined at a predetermined angle with respect to the radial direction R of the tire body 2. The inclination angle of the step portion 15 is larger than the inclination angle a of the inclined surface 14.
A recess 16 having a predetermined depth is formed on the front side surface 13a of each lug 4 (4a, 4b). The concave portion 16 is formed below the step portion 15. The recess 16 is formed at a position corresponding to the second inclined portion 10 of the long lug portion 7 of each lug 4. As shown in FIG. 1, the recess 16 is formed in an arc shape having a predetermined radius of curvature in a cross-sectional view.

図３に示すように、凹部１６の下側には、所定の曲率半径の曲面１７が形成されている。
各ラグ４（４ａ、４ｂ）の前側の側面１３ａには、前記段部１５と凹部１６の境界部分に、前方に突出する突起部（以下、上突起部２０という）が形成されている。また、各ラグ４（４ａ、４ｂ）の前側の側面１３ａには、凹部１６と前記曲面１７との境界部分に、前方に突出する突起部（以下、下突起部という）が形成されている。凹部１６はこの上突起部２０と下突起部２１の間に形成されている。 As shown in FIG. 3, a curved surface 17 having a predetermined radius of curvature is formed below the recess 16.
On the side surface 13a on the front side of each lug 4 (4a, 4b), a protruding portion (hereinafter referred to as an upper protruding portion 20) protruding forward is formed at a boundary portion between the step portion 15 and the recessed portion 16. Further, on the side surface 13a on the front side of each lug 4 (4a, 4b), a protruding portion (hereinafter referred to as a lower protruding portion) protruding forward is formed at a boundary portion between the concave portion 16 and the curved surface 17. The recess 16 is formed between the upper protrusion 20 and the lower protrusion 21.

図３に示すように、前記上突起部２０と下突起部２１を結んだ直線Ｅに対して垂線Ｆを引き、この垂線Ｆの方向を凹部１６の深さ方向としたとき、この凹部１６の深さｃは、円弧状の凹部１６の円弧長さの半分の位置（以下、中央位置Ｇという）で最も深くなる。以下、この凹部１６の中央位置Ｇから前記直線Ｅまでの深さ方向の距離を、単に「凹部１６の深さｃ」という。   As shown in FIG. 3, when a perpendicular F is drawn with respect to a straight line E connecting the upper protrusion 20 and the lower protrusion 21, and the direction of the perpendicular F is the depth direction of the recess 16, The depth c is deepest at a position half the arc length of the arc-shaped recess 16 (hereinafter referred to as the center position G). Hereinafter, the distance in the depth direction from the central position G of the recess 16 to the straight line E is simply referred to as “depth c of the recess 16”.

凹部１６は、図１に示すように、その一端部１６ａから他端部１６ｂにかけて一定の深さで形成されている。この凹部１６の深さｃは、タイヤ本体２の半径方向Ｒにおける凹部１６の長さｄの１０％以上２５％以下とされるのが望ましく、更に好ましくは、１４％以上２０％以下とされるのがよい。なお、凹部１６の深さｃとタイヤ本体２の半径方向Ｒにおける凹部１６の長さｄとの比が２５％を超えるとラグ４の剛性が低下して耐久性が低下するおそれがあるので好ましくない。   As shown in FIG. 1, the recess 16 is formed with a certain depth from one end 16 a to the other end 16 b. The depth c of the recess 16 is desirably 10% or more and 25% or less of the length d of the recess 16 in the radial direction R of the tire body 2, and more preferably 14% or more and 20% or less. It is good. If the ratio between the depth c of the recess 16 and the length d of the recess 16 in the radial direction R of the tire body 2 exceeds 25%, the rigidity of the lug 4 may be reduced and durability may be reduced. Absent.

ここで、タイヤ本体２の半径方向Ｒにおける凹部１６の長さｄとは、タイヤ本体２の半径方向Ｒにおける上突起部２０と下突起部２１の間の距離をいう。タイヤ本体２の半径方向Ｒにおける凹部１６の長さｄは、ラグ４の後側の側面１３ｂの高さｅの７０％以上とされている。
上述したラグ付き走行体１によれば、各ラグ４（４ａ、４ｂ）の前側の側面１３ａに形成された凹部１６の深さｃがラグ４の後側の側面１３ｂの高さｅの７０％以上とされ、さらに、この凹部１６の終端が突起部（上突起部２０、下突起部２１）とされることによって、走行中にこの凹部１６が効率的に土を掴むことができる。これによって、ラグ付き走行体１は、水田等を走行した場合であっても、スリップを抑えて良好なトラクション性能を確保できる。 Here, the length d of the recess 16 in the radial direction R of the tire body 2 refers to the distance between the upper protrusion 20 and the lower protrusion 21 in the radial direction R of the tire body 2. The length d of the recess 16 in the radial direction R of the tire body 2 is 70% or more of the height e of the rear side surface 13b of the lug 4.
According to the traveling body 1 with a lug described above, the depth c of the recess 16 formed in the front side surface 13a of each lug 4 (4a, 4b) is 70% of the height e of the rear side surface 13b of the lug 4. In addition, since the end of the recess 16 is a projection (upper projection 20, lower projection 21), the recess 16 can efficiently grab the soil during traveling. Thereby, even if the traveling body 1 with a lug travels on a paddy field or the like, it is possible to suppress slipping and ensure good traction performance.

ラグ付き走行体１の回転時において、ラグ４が土中に踏み込んだ後、土を蹴り上げる場合、ラグ４を基準にしてみると、ラグ４の踏み込み面である前側の側面１３ａに当たっている土は、図４の符号ｇで示す矢印のように、ラグ４の根元側から先端側（頂面１２側）に移動する。このとき、凹部１６に当たっている土は、上突起部２０によってその移動が妨げられる。この作用によって、本発明に係るラグ付き走行体１のラグ４は、凹部１６が形成されていない従来のラグ付き走行体（図５参照）よりも、トラクション性能を発揮できる。   When the lug 4 rotates into the soil after the lug 4 rotates, when the soil is kicked up, the soil hitting the front side surface 13a that is the stepping surface of the lug 4 is as follows. 4 moves from the base side of the lug 4 to the tip side (the top surface 12 side) as indicated by an arrow g in FIG. At this time, the movement of the soil hitting the recess 16 is hindered by the upper protrusion 20. Due to this action, the lug 4 of the traveling body with a lug 1 according to the present invention can exhibit traction performance more than a conventional traveling body with a lug in which the recess 16 is not formed (see FIG. 5).

また、各ラグ４（４ａ、４ｂ）の前側の側面１３ａの上部に前記傾斜面１４が形成されることで、水田のみならず、水分量の少ない土壌においても、ラグ４の先端部の傾斜面１４が土中に食い込み易くなり、これによって、スリップを抑えて良好なトラクションを確保できる。
また、ラグ４の前側の側面１３ａの上部に傾斜面１４よりも前方に突出した段部１５を形成することによって、このラグ４の先端部の剛性を高くできる。これによって、ラグ４は、土中に食い込んだときにも所定の形状を維持でき、ラグ付き走行体１は良好なトラクション性能を発揮できるようになる。 Further, the inclined surface 14 is formed on the front side surface 13a of each lug 4 (4a, 4b), so that the inclined surface of the tip of the lug 4 is not only in paddy fields but also in soil with a small amount of water. 14 becomes easy to bite into the soil, and thereby, slip can be suppressed and good traction can be secured.
Further, by forming the step portion 15 protruding forward from the inclined surface 14 at the upper portion of the front side surface 13a of the lug 4, the rigidity of the tip portion of the lug 4 can be increased. Accordingly, the lug 4 can maintain a predetermined shape even when it is digged into the soil, and the traveling body 1 with the lug can exhibit good traction performance.

本発明に係るラグ付き走行体１を製造し、トラクション性能についての試験を行った。性能試験では、タイヤサイズ：１３．６−２６、スリップ率：約４０％時、タイヤ本体２の半径方向Ｒにおける傾斜面１４の長さｂをラグ４の後側の側面１３ｂの高さｅの１３％（ｂ＝０．１３ｅ）とし、傾斜面１４の傾斜角度ａを２３°とした。
また、タイヤ本体２の半径方向Ｒにおける凹部１６の長さｄとラグ４の後側の側面１３ｂの高さｅとの比ｄ／ｅ、および凹部１６の深さｃとタイヤ本体２の半径方向Ｒにおける凹部１６の長さｄとの比ｃ／ｄの値を変えた実施例１〜１２、比較例１〜３を用意し、これらをトラクタに装着して湿田で走行させた。 The lug traveling body 1 according to the present invention was manufactured, and a test for traction performance was performed. In the performance test, when the tire size is 13.6-26 and the slip ratio is about 40%, the length b of the inclined surface 14 in the radial direction R of the tire body 2 is set to the height e of the rear side surface 13b of the lug 4. 13% (b = 0.13e), and the inclination angle a of the inclined surface 14 was 23 °.
Further, the ratio d / e between the length d of the recess 16 in the radial direction R of the tire body 2 and the height e of the rear side surface 13b of the lug 4, and the depth c of the recess 16 and the radial direction of the tire body 2 Examples 1 to 12 and Comparative Examples 1 to 3 in which the value of the ratio c / d with the length d of the recess 16 in R was changed were prepared, and these were mounted on a tractor and run on a wetland.

この試験では、ラグ４に凹部１６等が形成されていない従来のラグ付き走行体（農業用タイヤ。以下、従来例という）も使用した。この試験では、従来例のラグ付き走行体をトラクタに装着して走行した場合に運転者が感じる牽引力（トラクション）を１００として指数化した。
この試験では、本発明に係る実施例１〜１２、および比較例１〜３を装着したトラクタを運転し、従来例との比較を行った。この試験では、牽引力の値が大きければ大きい程、ラグ付き走行体１のトラクション性能がより良く発揮されることを意味する。 In this test, a conventional traveling body with a lug (agricultural tire, hereinafter referred to as a conventional example) in which the recess 16 or the like is not formed in the lug 4 was also used. In this test, the traction force (traction) felt by the driver when the traveling body with a lug of the conventional example was mounted on a tractor was indexed as 100.
In this test, tractors equipped with Examples 1 to 12 and Comparative Examples 1 to 3 according to the present invention were operated and compared with a conventional example. In this test, it means that the larger the value of the traction force, the better the traction performance of the traveling body 1 with a lug is exhibited.

試験結果を表１に示す。   The test results are shown in Table 1.

Figure 0004864577
Figure 0004864577

試験結果（表１）によれば、本発明に係るラグ付き走行体１は、実施例１乃至実施例３のように、（ｄ／ｅ）×１００の値が７０％の場合において、（ｃ／ｄ）×１００の値が１０％〜２５％（好ましくは１４％〜２５％の範囲内）の範囲内で、従来例および比較例１｛（ｃ／ｄ）×１００＝８（％）｝よりもトラクション性能が良いことがわかった。また、実施例３のように、（ｃ／ｄ）×１００の値が２５％の場合が最もトラクション性能が良いことがわかった。   According to the test results (Table 1), the lug-equipped traveling body 1 according to the present invention, as in Examples 1 to 3, in the case where the value of (d / e) × 100 is 70%, (c / D) × 100 within a range of 10% to 25% (preferably within a range of 14% to 25%), the conventional example and the comparative example 1 {(c / d) × 100 = 8 (%)} It was found that the traction performance was better than that. Further, as in Example 3, it was found that the traction performance was the best when the value of (c / d) × 100 was 25%.

また、表１によれば、本発明に係るラグ付き走行体１は、実施例４乃至実施例７のように、（ｄ／ｅ）×１００の値が８０％の場合において、（ｃ／ｄ）×１００の値が１０％〜２５％の範囲内で、従来例および比較例３｛（ｃ／ｄ）×１００＝８（％）｝よりもトラクション性能が良いことがわかった。また、実施例６、７のように、（ｃ／ｄ）×１００の値が２０％〜２５％の範囲内でさらにトラクション性能がよく、この値が実施例７のように２５％の場合で最もトラクション性能が良いことがわかった。   Moreover, according to Table 1, the traveling body 1 with a lug according to the present invention has a (c / d) when the value of (d / e) × 100 is 80% as in the fourth to seventh embodiments. ) × 100 in the range of 10% to 25%, it was found that the traction performance was better than the conventional example and the comparative example 3 {(c / d) × 100 = 8 (%)}. Further, as in Examples 6 and 7, when the value of (c / d) × 100 is in the range of 20% to 25%, the traction performance is better, and this value is 25% as in Example 7. It was found that the traction performance was the best.

また、表１によれば、本発明に係るラグ付き走行体１は、実施例８乃至実施例１２のように、（ｄ／ｅ）×１００の値が９０％の場合において、（ｃ／ｄ）×１００の値が８％〜２５％の範囲内で、従来例および比較例１〜３よりもトラクション性能が良いことがわかった。また、実施例１０乃至実施例１２のように、（ｃ／ｄ）×１００の値が１４％〜２５％の範囲内でさらにトラクション性能がよく、この値が実施例１２のように２５％の場合が最もトラクション性能が良いことがわかった。   Moreover, according to Table 1, the traveling body 1 with a lug according to the present invention has a (c / d) when the value of (d / e) × 100 is 90% as in the eighth to twelfth embodiments. ) It was found that the traction performance was better than that of the conventional example and the comparative examples 1 to 3 when the value of x100 was in the range of 8% to 25%. Further, as in Example 10 to Example 12, the value of (c / d) × 100 is better in the range of 14% to 25%, and this traction performance is 25% as in Example 12. The case was found to have the best traction performance.

以上により、本発明に係るラグ付き走行体１は、（ｄ／ｅ）×１００の値が７０％以上９０％以下の場合において、（ｃ／ｄ）×１００の値が１０％〜２５％の範囲内で、比較例よりもトラクション性能が良く、（ｃ／ｄ）×１００の値が１４％〜２５％の場合がさらにトラクション性能を発揮が良いことがわかった。
図６の第２実施形態では、各ラグ４（４ａ、４ｂ）の前側の側面１３ａに形成された凹部１６の形状が第１実施形態と異なる。 As described above, the lagging traveling body 1 according to the present invention has a value of (c / d) × 100 of 10% to 25% when the value of (d / e) × 100 is 70% or more and 90% or less. Within the range, it was found that the traction performance was better than that of the comparative example, and the traction performance was better when the value of (c / d) × 100 was 14% to 25%.
In 2nd Embodiment of FIG. 6, the shape of the recessed part 16 formed in the front side surface 13a of each lug 4 (4a, 4b) differs from 1st Embodiment.

図６に示すように、凹部１６の深さは、タイヤ本体２の幅方向Ｘの内方に向かうにつれて徐徐に深くなるように形成されている。ここで、タイヤ本体２の幅方向Ｘの内方とは、幅方向Ｘにおいてタイヤ本体２のサイドウォール部５ａ、５ｂからタイヤ本体２の幅方向Ｘの中心（赤道面ＥＰ）に向かう方向をいう。
ラグ付き走行体１は、平面視において、ラグ４が赤道面ＥＰに対してなす角度が９０°に近い程、よりトラクション性能を発揮する。ただし、この角度が９０°に近くなればなるほど、走行中の振動が大きくなる。 As shown in FIG. 6, the depth of the recess 16 is formed so as to gradually become deeper inward in the width direction X of the tire body 2. Here, the inner side of the tire body 2 in the width direction X refers to a direction from the sidewall portions 5a and 5b of the tire body 2 toward the center (equatorial plane EP) of the tire body 2 in the width direction X. .
The lagging traveling body 1 exhibits more traction performance as the angle formed by the lug 4 with respect to the equatorial plane EP is closer to 90 ° in plan view. However, the closer this angle is to 90 °, the greater the vibration during travel.

これに対し、本発明では、前記凹部１６の深さをタイヤ本体２の幅方向Ｘの内方に向かうにつれて徐徐に深く形成することによって、この凹部１６の底部１６ｃは、図６に示すように、赤道面ＥＰに対してなす角度が大きくなる。これにより、ラグ４の赤道面ＥＰに対する傾斜角度を大きくすることなく、凹部１６の底部１６ｃの赤道面ＥＰにする傾斜角度を大きくできる。したがって、このラグ付き走行体１は、走行中の振動を抑制するとともにトラクション性能を十分に発揮できるようになる。   On the other hand, in the present invention, the bottom portion 16c of the concave portion 16 is formed deeper gradually as it goes inward in the width direction X of the tire body 2 as shown in FIG. The angle formed with respect to the equatorial plane EP is increased. Thereby, without increasing the inclination angle of the lug 4 with respect to the equator plane EP, the inclination angle of the bottom portion 16c of the recess 16 with respect to the equator plane EP can be increased. Therefore, the lug-equipped traveling body 1 can sufficiently exhibit traction performance while suppressing vibration during traveling.

また、第２傾斜部１０の第２傾斜角度θ２は、第１傾斜部９の第１傾斜角度θ１よりも大きく、５０°以上とされているので、前側の側面１３ａの第１傾斜部９に対応する位置に形成した凹部１６を形成するよりも、第２傾斜部１０の前側の側面１３ａに凹部１６を形成した方が、ラグ４のトラクション性能をより良く発揮できる。
第２実施形態のその他の構成は、第１実施形態と同じである。第２実施形態と第１実施形態とで共通する部分には共通符号を付している。 Further, since the second inclination angle θ2 of the second inclined portion 10 is larger than the first inclination angle θ1 of the first inclined portion 9 and is 50 ° or more, the first inclined portion 9 on the side surface 13a on the front side is formed. The traction performance of the lug 4 can be better exhibited by forming the recess 16 on the front side surface 13a of the second inclined portion 10 than by forming the recess 16 formed at the corresponding position.
Other configurations of the second embodiment are the same as those of the first embodiment. Parts common to the second embodiment and the first embodiment are denoted by common reference numerals.

図７、図８に示す第３実施形態では、 タイヤ本体２のトレッド部３のラグ４部分以外の表面に、複数の突起２３が設けられている。この突起２３はタイヤ本体２のトレッド部３と同じ材質のゴムにより形成されている。この突起２３はトレッド部３の表面から半径方向Ｒ外向きに突出して形成されている。この突起２３は円柱状に形成されている。
この突起２３の断面積は、０．８ｍｍ2以上１３．０ｍｍ2以下とされている。また、この突起２３の長さは、３ｍｍ以上１０ｍｍ以下とされている。この突起２３の付け根が位置する平面が基準面とされたとき、この突起２３がこの基準面に対してなす角度は、６０°以上９０°以下である。各突起２３の間隔は、３．０ｍｍ以上５．０ｍｍ以下である。 In the third embodiment shown in FIGS. 7 and 8, a plurality of protrusions 23 are provided on the surface other than the lug 4 portion of the tread portion 3 of the tire body 2. The protrusion 23 is formed of rubber made of the same material as the tread portion 3 of the tire body 2. The protrusions 23 are formed to protrude outward in the radial direction R from the surface of the tread portion 3. The protrusion 23 is formed in a cylindrical shape.
Sectional area of the projection 23 is a 0.8 mm 2 or more 13.0 mm 2 or less. The length of the protrusion 23 is 3 mm or more and 10 mm or less. When the plane on which the root of the protrusion 23 is located is the reference surface, the angle formed by the protrusion 23 with respect to the reference surface is 60 ° or more and 90 ° or less. The interval between the protrusions 23 is 3.0 mm or greater and 5.0 mm or less.

この突起２３の総数は、５０００以上３０００００以下である。突起２３の総数が５０００以上に設定されることにより、この突起２３の間に泥土が入りこみ難くなる。
農作業機械にラグ付き走行体１を装着して走行した場合、突起２３は、ラグ付き走行体１の回転に応じて順次地面に接していく。地面に接した突起２３は、機体の荷重により倒れるように弾性変形する。この突起２３は、地面から離れると元の状態に復元する。この弾性変形と復元によって、突起２３は泥土をはじくことができ、ラグ付き走行体１は、トレッド部３に泥土が付着しにくい構成になっている。 The total number of the protrusions 23 is 5000 or more and 300000 or less. By setting the total number of the protrusions 23 to 5000 or more, it becomes difficult for mud to enter between the protrusions 23.
When traveling with the lug traveling body 1 mounted on an agricultural machine, the projections 23 sequentially contact the ground according to the rotation of the lug traveling body 1. The protrusion 23 in contact with the ground is elastically deformed so as to fall down due to the load of the airframe. The protrusion 23 is restored to its original state when it is separated from the ground. Due to this elastic deformation and restoration, the protrusion 23 can repel mud, and the traveling body 1 with a lug has a structure in which mud is difficult to adhere to the tread portion 3.

第３実施形態のその他の構成は、第２実施形態とほぼ同じである。第３実施形態が第２実施形態と共通する部分には、共通符号を付している。第３実施形態に係るラグ付き走行体１は、第２実施形態と同様に、各ラグ４（４ａ、４ｂ）に形成された凹部１６によって水田等を走行した場合においても十分なトラクション性能を発揮できる。各ラグ４（４ａ、４ｂ）の前側の側面１３ａの上部に前記傾斜面１４が形成されることで、水田のみならず、水分量の少ない土壌においても、各ラグ４（４ａ、４ｂ）の先端部が土中に食い込み易くなり、これによって、スリップを抑えて良好なトラクションを確保できる。ラグ４の前側の側面１３ａの上部に、前方に突出する段部１５を形成することによって、このラグ４の先端部の剛性を高くできる。   Other configurations of the third embodiment are substantially the same as those of the second embodiment. Parts common to the second embodiment in the third embodiment are denoted by common reference numerals. As with the second embodiment, the lug-equipped traveling body 1 according to the third embodiment exhibits sufficient traction performance even when traveling on a paddy field or the like by the recess 16 formed in each lug 4 (4a, 4b). it can. By forming the inclined surface 14 above the front side surface 13a of each lug 4 (4a, 4b), the tip of each lug 4 (4a, 4b) not only in paddy fields but also in soil with a small amount of water. This makes it easier for the part to bite into the soil, thereby preventing slipping and ensuring good traction. By forming the step portion 15 protruding forward in the upper portion of the front side surface 13 a of the lug 4, the rigidity of the tip portion of the lug 4 can be increased.

図９の第４実施形態では、ラグ４に形成された凹部１６の構成が第１実施形態と異なる。この第４実施形態では、各ラグ４（４ａ、４ｂ）の前側の側面１３ａに複数の凹部１６が形成されている。この第４実施形態における凹部１６の数は３である。凹部１６は、各ラグ４（４ａ、４ｂ）の前側の側面１３ａのうち、長ラグ部７の第１傾斜部９に対応する部分、第２傾斜部１０に対応する部分、短ラグ部８に対応する部分の３箇所に形成されている。各ラグ４（４ａ、４ｂ）の前側の側面１３ａには、各凹部１０の位置に対応して、傾斜面１４、段部１５、曲面１７等が形成されている。   In 4th Embodiment of FIG. 9, the structure of the recessed part 16 formed in the lug 4 differs from 1st Embodiment. In the fourth embodiment, a plurality of recesses 16 are formed on the front side surface 13a of each lug 4 (4a, 4b). In this fourth embodiment, the number of recesses 16 is three. The concave portion 16 is formed on the front side surface 13a of each lug 4 (4a, 4b) on the portion corresponding to the first inclined portion 9 of the long lug portion 7, the portion corresponding to the second inclined portion 10, and the short lug portion 8. It is formed in three places of the corresponding part. On the front side surface 13a of each lug 4 (4a, 4b), an inclined surface 14, a step portion 15, a curved surface 17 and the like are formed corresponding to the position of each recess 10.

第４実施形態におけるその他の構成は、第１実施形態と同様の構成である。第４実施形態と第１実施形態とで共通する部分には共通符号を付している。
第４実施形態においても、第１実施形態と同様に、ラグ４の前側に形成された凹部１６によって、水田等で走行した場合にも十分なトラクション性能を発揮できる。各ラグ４（４ａ、４ｂ）の前側の側面１３ａの上部に前記傾斜面１４が形成されることで、水田のみならず、水分量の少ない土壌においても、ラグ４の先端部が土中に食い込み易くなり、これによって、スリップを抑えて良好なトラクションを確保できる。ラグ４の前側の側面１３ａの上部に、前方に突出する段部１５を形成することによって、このラグ４の先端部の剛性を高くできる。 Other configurations in the fourth embodiment are the same as those in the first embodiment. Portions common to the fourth embodiment and the first embodiment are denoted by common reference numerals.
In the fourth embodiment as well, as in the first embodiment, the recess 16 formed on the front side of the lug 4 can exhibit sufficient traction performance even when traveling in a paddy field or the like. By forming the inclined surface 14 above the front side surface 13a of each lug 4 (4a, 4b), the tip of the lug 4 bites into the soil not only in paddy fields but also in soil with low moisture content. This makes it easier to suppress slipping and ensure good traction. By forming the step portion 15 protruding forward in the upper portion of the front side surface 13 a of the lug 4, the rigidity of the tip portion of the lug 4 can be increased.

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、上記の実施形態では、ラグ付き走行体１として農作業用タイヤを例示したが、これに限らず無端帯状の弾性クローラにも本発明を適用可能である。弾性クローラは無端帯状のクローラ本体とこのクローラ本体の外周面に形成されたラグ４とを備える。この場合は、上述した実施の形態において、前記タイヤ本体２の語を、クローラ本体の語に読み替えて本発明を適用する。ラグ４の形状その他の構成は、第１実施形態で説明した通りに弾性クローラに適用される。 The present invention is not limited to the above-described embodiment, and various changes and modifications can be made.
For example, in the above embodiment, the agricultural work tire is exemplified as the traveling body 1 with a lug. However, the present invention is not limited to this, and the present invention can also be applied to an endless belt-like elastic crawler. The elastic crawler includes an endless belt-like crawler body and a lug 4 formed on the outer peripheral surface of the crawler body. In this case, in the above-described embodiment, the term “tire main body 2” is replaced with the term “crawler main body”, and the present invention is applied. The shape and other configurations of the lug 4 are applied to the elastic crawler as described in the first embodiment.

ラグ４に形成された凹部１６の数は、２、又は４以上であってもよい。第４実施形態では、ラグ４の前側の側面１３ａの３箇所に凹部１６が形成されていたが、これらは互いにつなげるように形成されてもよい。これにより、凹部１６は、各ラグ４（４ａ、４ｂ）の短ラグ部８から長ラグ部７の第２傾斜部１０にかけて、連続状に形成される。
上述した実施の形態では第１ラグ４ａと第２ラグ４ｂとを同じ形状のものを左右反転させたものを例示したが、第１ラグ４ａと第２ラグ４ｂの形状は異なっていてもよい。 The number of the recessed parts 16 formed in the lug 4 may be two, or four or more. In 4th Embodiment, although the recessed part 16 was formed in three places of the side surface 13a of the front side of the lug 4, these may be formed so that it may connect mutually. Thereby, the recessed part 16 is continuously formed from the short lug part 8 of each lug 4 (4a, 4b) to the 2nd inclination part 10 of the long lug part 7. FIG.
In the above-described embodiment, the first lug 4a and the second lug 4b are illustrated by inverting the left and right of the same shape, but the shapes of the first lug 4a and the second lug 4b may be different.

本発明は、農作業車両等の車輪に利用できる。   The present invention can be used for wheels of agricultural vehicles and the like.

本発明の第１実施形態に係るラグ付き走行体の部分平面図である。It is a partial top view of the traveling body with a lug which concerns on 1st Embodiment of this invention. ラグの部分拡大図である。It is the elements on larger scale of a lug. 図２のＢーＢ矢示線断面図である。FIG. 3 is a cross-sectional view taken along line B-B in FIG. 2. ラグ付き走行体の回転中のラグの作用を説明する図である。It is a figure explaining the effect | action of the lug in rotation of the traveling body with a lug. 従来のラグの作用を説明する図である。It is a figure explaining the effect | action of the conventional lug. 本発明の第２実施形態に係るラグ付き走行体の部分平面図である。It is a partial top view of the traveling body with a lug which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係るラグ付き走行体の部分平面図である。It is a fragmentary top view of the traveling body with a lug which concerns on 3rd Embodiment of this invention. 図７のＣ−Ｃ矢示線断面図である。It is CC sectional view taken on the line of FIG. 本発明の第４実施形態に係るラグ付き走行体の部分平面図である。It is a partial top view of the traveling body with a lug which concerns on 4th Embodiment of this invention.

１ ラグ付き走行体
２ タイヤ本体
４ ラグ
４ａ 第１ラグ
４ｂ 第２ラグ
５ａ 一方のサイドウォール部
５ｂ 他方のサイドウォール部
７ 長ラグ部
８ 短ラグ部
１３ 側面
１３ａ 前側の側面
１３ｂ 後側の側面
１４ 傾斜面
１５ 段部
１６ 凹部
２３ 突起
Ｙ 周方向
Ｒ 半径方向 DESCRIPTION OF SYMBOLS 1 Traveling body with lug 2 Tire main body 4 Lug 4a 1st lug 4b 2nd lug 5a One side wall part 5b The other side wall part 7 Long lug part 8 Short lug part 13 Side surface 13a Front side surface 13b Rear side surface 14 Inclined surface 15 Step 16 Recess 23 Protrusion Y Circumferential direction R Radial direction

Claims (5)

タイヤ本体の一方のサイドウォール部側に片寄って形成された第１ラグと、他方のサイドウォール部側に片寄って形成された第２ラグとがこのタイヤ本体の周方向に交互に形成されており、
前記第１ラグは、
タイヤ本体の赤道面から一方のサイドウォール部にわたって形成された長ラグ部と、
前記赤道面から他方のサイドウォール部に向かって形成された短ラグ部とを有し、
前記第２ラグは、
タイヤ本体の赤道面から一方のサイドウォール部に向かって形成された短ラグ部と、
前記赤道面から他方のサイドウォール部にわたって形成された長ラグ部とを有しており、
前記各ラグの前側の側面の上部には、タイヤ本体の半径方向に対して１°〜２５°の範囲の角度で傾斜する傾斜面が形成され、
この傾斜面の半径方向の長さは、各ラグの後側の側面の高さの１５％以下とされており、
かつ前記傾斜面の下側に、この傾斜面よりも前方に突出する段部が形成され、
この段部の下側に所定の深さの凹部が形成され、
前記凹部は、
その前記半径方向の長さがラグの後側の側面の高さの７０％以上８０％未満のときその深さが前記半径方向の長さの１４％以上であり、
その前記半径方向の長さがラグの後側の側面の高さの８０％以上９０％未満のときその深さが前記半径方向の長さの１０％以上であり、
その前記半径方向の長さがラグの後側の側面の高さの９０％以上のときその深さが前記半径方向の長さの８％以上である
ことを特徴とするラグ付き走行体。 The first lug formed to be offset toward one sidewall portion side of the tire body and the second lug formed to be offset toward the other sidewall portion side are alternately formed in the circumferential direction of the tire body. ,
The first lug is
A long lug formed from the equatorial plane of the tire body to one sidewall,
A short lug formed from the equatorial plane toward the other sidewall,
The second lug is
A short lug formed from the equatorial plane of the tire body toward one sidewall,
A long lug formed from the equatorial plane to the other sidewall,
An inclined surface that is inclined at an angle in the range of 1 ° to 25 ° with respect to the radial direction of the tire body is formed on the upper portion of the front side surface of each lug.
The length of the inclined surface in the radial direction is 15% or less of the height of the rear side surface of each lug,
And, on the lower side of the inclined surface, a step portion protruding forward from the inclined surface is formed,
A recess having a predetermined depth is formed below the step,
The recess is
The radial length of that is at the depth of their more than 14% of the length of said radially when height less than 80% 70% or more aspects of the rear side of the lug,
The radial length of that is at the depth of their more than 10% of the length of said radially when less than 80% to 90% of the height of the side surface of the rear side of the lug,
It lugged traveling body in which said radial length of that is characterized in that at least 8% depth of that of the length of the radial case of more than 90% of the height of the side surface of the rear side of the lug . 前記第１ラグおよび前記第２ラグは、
いずれもその前記長ラグ部と前記短ラグ部とが平面視においてＶ字を形成し前記赤道面に位置する部分が前側となるように配された
ことを特徴とする請求項１に記載のラグ付き走行体。 The first lug and the second lug are
2. The lug according to claim 1, wherein each of the long lug portion and the short lug portion forms a V shape in a plan view and a portion located on the equator plane is on the front side. Running body with. 前記長ラグ部は、その中途部が赤道面に対して５０°以上に傾斜した傾斜部を備え、
この傾斜部に前記凹部が形成されている
ことを特徴とする請求項１または２に記載のラグ付き走行体。 The long lug portion includes an inclined portion whose midway portion is inclined at 50 ° or more with respect to the equator plane,
The traveling body with a lug according to claim 1 or 2 , wherein the concave portion is formed in the inclined portion . 凹部の深さは、タイヤ本体の幅方向の内方に向かうにつれて徐徐に深くなるように形成されている
ことを特徴とする請求項１から３のいずれか１項に記載のラグ付き走行体。 The travel body with a lug according to any one of claims 1 to 3, wherein the depth of the recess is formed so as to gradually become deeper inward in the width direction of the tire body . タイヤ本体のトレッド部の表面には、複数の突起が設けられているA plurality of protrusions are provided on the surface of the tread portion of the tire body.
ことを特徴とする請求項１から４のいずれか１項に記載のラグ付き走行体。The traveling body with a lug according to any one of claims 1 to 4, wherein the traveling body has a lug.
JP2006189767A 2006-07-10 2006-07-10 Running body with lugs Expired - Fee Related JP4864577B2 (en)

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JP5985381B2 (en) * 2012-12-20 2016-09-06 株式会社ブリヂストン Pneumatic tire
ITRM20130447A1 (en) * 2013-07-30 2015-01-31 Trelleborg Wheel Sys Italia Spa TIRE WITH IMPROVED TRACTION CAPACITY.
ITUB20155089A1 (en) 2015-10-29 2017-04-29 Bridgestone Corp AGRICULTURAL TIRE
CN107097596B (en) * 2017-05-27 2023-05-09 厦门正新橡胶工业有限公司 Light all-terrain vehicle tire tread pattern structure for soft snow
CN109080385A (en) * 2018-09-08 2018-12-25 西安科技大学 A kind of antiskid chain
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JP2736016B2 (en) * 1994-07-21 1998-04-02 株式会社ブリヂストン Pneumatic tire with lug
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