JPH092346A - Rubber crawler - Google Patents

Abstract

PURPOSE: To restrain both longitudinal displacement and crosswise displacement of a core by projecting bulged parts from adjacent cores toward each other, by overlapping parts of the bulged parts with each other, by specifying the angles of the overlapping parts. CONSTITUTION: A plurality of cores 3 embedded in an endless rubber elastic body 2 are arranged at predetermined intervals in the longitudinal direction of a rubber crawler 1. A pair of left and right prism-like inner bulged parts 9 are formed in the lower parts of a pair of guide rails 8 in one end part of the core 3, and a pair of left and right prism-like outer bulge parts 10 are formed in the lower part of the guide rail 8 in the other end part. Further, an overlapping angle θ1 between the outline of the inner bulged part 9 on the over lapping side and the outline widthwise of the rubber crawler 1 or longitudinal of the core 3, and an overlapping angle θ2 of the outer bulged part which is similarly defined, is set to be larger than 90deg. that is, 100deg.<=θ1 , θ2 <=135deg. Accordingly, a longitudinal tensile force FA acts between the adjacent cores 31 , 32 , the overlapping parts of the bulged parts 9, 10 abut against each other through the intermediary of a thin wall rubber 11.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、農耕地や建設現場など
で使用される無限軌道車の走行装置に装着されるゴムク
ロ−ラに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler mounted on a traveling device of a tracked vehicle used in agricultural land or construction sites.

【０００２】[0002]

【従来の技術】一般にゴムクロ−ラは、従前の鉄キャタ
ピラに比べ、突起物への乗り上げや横傾斜地の走行や又
急旋回等によって大きな横力を受ける場合や急後進時や
クロ−ラ長さが過大となっていて弛みがある場合等にお
いて、クロ−ラ外れ即ち脱輪を生じ易いという問題があ
った。第８図は、ゴムクロ−ラ１００の内周側から平面
視した場合の前記脱輪の状態を示すものであって、路面
からゴムクロ−ラ１００の幅方向に大きな横力を受ける
と隣接する芯金１０１、１０１｀間で横ずれが発生して
案内輪１０２の中央輪１０２ａが芯金１０１｀の上部に
設けられているガイドレ−ルとしての角部１０３上に乗
り上げて脱輪しクロ−ラ外れとなるのである。従来より
この問題を解決するために種々の検討がなされ、例え
ば、実用新案公報実開平４−６７５８５号や特許公報特
開平４−１６９３８３号に開示されるように、隣接する
芯金の中央部分にゴムクロ−ラの長手方向に突出する一
対の小突起（膨出部）を相互に対向して設置して、ゴム
クロ−ラに横力を受けて芯金が横変位しようとした場合
に、対向する該小突起が相互に接触干渉して芯金の横変
位を減少するようにしたものが提案されている。2. Description of the Related Art Generally, a rubber crawler has a greater lateral force than a conventional iron caterpillar when it receives a large lateral force due to riding on a protrusion, traveling on a laterally sloping ground, sudden turning, etc. However, there is a problem that the crawler is easily disengaged, that is, the wheel is derailed when there is excessive slack. FIG. 8 shows a state of the derailment when viewed in plan from the inner peripheral side of the rubber crawler 100, and the cores adjacent to each other when a large lateral force is applied from the road surface in the width direction of the rubber crawler 100. Lateral slippage occurs between the gold 101, 101 ", and the center wheel 102a of the guide wheel 102 rides on the corner 103 as a guide rail provided on the upper part of the core 101" to remove the wheel and disengage the crawler. It becomes. Various studies have been made in order to solve this problem. For example, as disclosed in Utility Model Publication No. 4-67585 and Japanese Patent Publication No. 4-169383, the central portion of the adjacent core metal is A pair of small protrusions (bulging parts) protruding in the longitudinal direction of the rubber crawler are installed to face each other, and face each other when a lateral force is applied to the rubber crawler and the core bar is about to be laterally displaced. It has been proposed that the small protrusions interfere with each other to reduce the lateral displacement of the cored bar.

【０００３】[0003]

【発明が解決しようとする課題】しかるに、前記実用新
案公報実開平４−６７５８５号に開示される従来例で
は、隣接する芯金の双方から突出する膨出部はゴムクロ
−ラのゴム弾性体の内部に埋設されて、駆動輪や遊動輪
への巻きかけ時のクロ−ラの屈曲性を損なわないように
するために対向する膨出部が接触しないように相互に離
隔して配置され、しかもその離隔間隔が狭いことから、
隣接する芯金双方から突出する膨出部間に介在する薄肉
ゴムに大きな剪断変形が発生してこの部分の耐久性を低
下させる不具合や、また隣接する芯金間のゴムクロ−ラ
の長手方向（以後、ゴムクロ−ラの長手方向を前後方向
と呼称し、これに直角方向を幅方向と呼称する）の変形
を抑制する工夫がなく、ゴムクロ−ラの弛みが大きい場
合に該クロ−ラの前後方向の弛緩変形が大となって、芯
金の横変位を助長するなどの虞がある。However, in the conventional example disclosed in Japanese Utility Model Application Laid-Open No. 4-67585, the bulging portions projecting from both of the adjacent cores are made of the rubber elastic body of the rubber crawler. It is embedded inside and is arranged so as not to contact the bulging portions facing each other so as not to impair the flexibility of the crawler when wound around the drive wheel or the idle wheel, and Because the separation distance is narrow,
There is a problem that a large shear deformation occurs in the thin rubber interposed between the bulging portions projecting from both the adjacent cores to reduce the durability of this part, and the longitudinal direction of the rubber crawler between the adjacent cores ( Hereinafter, the longitudinal direction of the rubber crawlers will be referred to as the front-back direction, and the direction perpendicular to this will be referred to as the width direction). There is a possibility that the relaxation deformation in the direction becomes large, which promotes lateral displacement of the cored bar.

【０００４】また、特許公報 開平４−１６９３８３号
に開示される従来例の場合では、前記同様の芯金横変位
防止用の小突起がゴムに埋設されていない構成となって
いるために、使用時の小突起の衝突摩擦の繰り返しによ
って該小突起の損傷が早まる問題や、特に、隣接芯金間
に前後方向の変位を抑制する手段が存在しないために、
前記の従来例と同様に、ゴムクロ−ラの弛みが大きい場
合にクロ−ラの前後方向の弛緩変形が大となって芯金の
横変位を助長する等の問題がある。Further, in the case of the conventional example disclosed in Japanese Patent Laid-Open No. 4-169383, it is used because the same small protrusion for preventing lateral displacement of the core metal as described above is not embedded in rubber. The problem of accelerating the damage of the small projections due to the repeated collision friction of the small projections at the time, especially, because there is no means for suppressing the displacement in the front-back direction between the adjacent cores,
Similar to the above-mentioned conventional example, when the slack of the rubber crawler is large, there is a problem that the slack deformation in the front-rear direction of the crawler becomes large and the lateral displacement of the cored bar is promoted.

【０００５】更に、従来のゴムクロ−ラにあっては、ゴ
ムクロ−ラの前後方向の過度な伸長を防止する工夫がな
いために、外力や変形によってゴムクロ−ラが引き伸ば
されて前記図８における芯金１０１の下層に配置された
抗張体としてのスチ−ルコ−ドに限界伸度以上の伸びが
生じた場合には、該スチ−ルコ−ド１０４が切断する虞
がある。Further, in the conventional rubber crawler, since there is no means for preventing the rubber crawler from being excessively stretched in the front-rear direction, the rubber crawler is stretched by an external force or deformation and the core shown in FIG. When the steel cord as a tensile body disposed in the lower layer of the gold 101 expands beyond the limit elongation, the steel cord 104 may be cut.

【０００６】上記の実情に鑑みて、本発明の目的は、芯
金変位防止用の小突起（膨出部）周辺の薄肉ゴムと該膨
出部の耐久性を低下することなく、芯金の前後方向変位
と横変位とを共に抑制することによって、優れた耐久性
と脱輪し難いゴムクロ−ラを提供することである。In view of the above circumstances, an object of the present invention is to provide a thin rubber around the small protrusion (bulging portion) for preventing displacement of the core metal and the durability of the bulging portion without deteriorating the core metal. It is an object of the present invention to provide a rubber crawler having excellent durability and being difficult to derail by suppressing both longitudinal displacement and lateral displacement.

【０００７】[0007]

【課題を解決するための手段】上記の目的を達成する為
に、本発明のゴムクロ−ラでは、特許請求項１に記載の
如く、無端状ゴム弾性体と、その幅方向に延在して埋設
される複数の芯金とを有し、該芯金が前記無端状ゴム弾
性体の長手方向に相互に離隔して配置されるゴムクロ−
ラであって、隣接する前記芯金の各々から相対する方向
に膨出部が突出されて、相対する前記膨出部の少なくと
も一部がゴムクロ−ラの幅方向に重複され、しかもゴム
クロ−ラの平面視で各々の膨出側の重複する部分の稜線
がゴムクロ−ラの幅方向となす内角、即ち夫々の重複角
度θ₁ 、θ₂ が、９０°を越える角度、好ましくは１０
０°≦θ₁ 、θ₂ ≦１３５°の範囲にあることを特徴と
するとしている。In order to achieve the above-mentioned object, in the rubber crawler of the present invention, as described in claim 1, an endless rubber elastic body and a rubber elastic body extending in the width direction thereof are provided. A rubber claw having a plurality of cores embedded therein, the cores being spaced apart from each other in the longitudinal direction of the endless rubber elastic body.
A bulging portion is protruded from each of the adjacent cores in a direction opposite to each other, and at least a part of the facing bulging portion is overlapped in the width direction of the rubber crawler. In the plan view, the inner angles formed by the ridge lines of the overlapping portions on the respective bulging sides with the width direction of the rubber crawler, that is, the respective overlapping angles θ ₁ and θ ₂ are angles exceeding 90 °, preferably 10 °
It is characterized by being in the range of 0 ° ≦ θ ₁ and θ ₂ ≦ 135 °.

【０００８】また、芯金の前後方向変位及び横変位を共
に防止する前記膨出部の形状の特別なものとして、特許
請求項２に記載の発明では、隣接する前記芯金の各々か
ら相対する方向に突出される前記膨出部の先端が相互に
凹凸を形成する入れ子状とされ、凹部を形成する前記先
端の凹部内を凸部を形成する前記先端がクロ−ラ表面に
ほぼ垂直方向に通過し得るような切欠が、前記凹部を形
成する先端の少なくとも一方側に設けられている請求項
第１項記載のゴムクロ−ラとしている。Further, as a special shape of the bulging portion for preventing both the longitudinal displacement and the lateral displacement of the cored bar, in the invention according to claim 2, the cored bar is opposed to each adjacent cored bar. The tips of the bulging portions protruding in the direction are formed in a nested shape to form irregularities with each other, and the tips forming the protrusions are formed in the recesses of the tips forming the recesses in a direction substantially perpendicular to the surface of the crawler. The rubber crawler according to claim 1, wherein a notch that allows passage is provided on at least one side of the tip forming the recess.

【０００９】[0009]

【作用】本発明のゴムクロ−ラでは、無端状ゴム弾性体
の内部に埋設される複数の芯金の各々において、ゴムク
ロ−ラの長手方向の両端部に突起状に設けた膨出部の少
なくとも一部が隣接する芯金の相対する膨出部とゴムク
ロ−ラの幅方向に重複されており、しかも、膨出部が重
複する側の稜線がゴムクロ−ラの幅方向となす内角、即
ち夫々の重複角度θ₁ 、θ₂ が、９０°を越える角度に
設定されているので、ゴムクロ−ラに前後方向や横方向
の外力を受けた場合に前記膨出部によって両方向の芯金
の変位を各々効果的に抑制することが出来る。In the rubber crawler of the present invention, in each of the plurality of cores embedded in the endless rubber elastic body, at least the bulging portions provided in the form of protrusions at both ends in the longitudinal direction of the rubber crawler. Some of them are overlapped with each other in the width direction of the rubber crawlers and the opposing bulging portions of the adjacent cores, and the ridge lines on the sides where the bulging portions overlap are the inner angles formed with the width direction of the rubber crawlers, that is, The overlapping angles θ ₁ and θ ₂ are set to an angle exceeding 90 °, so that when the rubber crawler receives an external force in the front-back direction or the lateral direction, the bulging portion displaces the cored bar in both directions. Each can be effectively suppressed.

【００１０】即ち、本発明に係るクロ−ラをその内側か
ら平面視した時の膨出部の拡大模式図である図９に示す
如く、隣接する芯金から突出されて対向する膨出部２０
１、２０２に前後方向の引張力Ｆ_A が作用すると、ゴム
クロ−ラの幅方向に対して９０°を越える前記重複角度
θ₁ 、θ₂ で傾斜する稜線を持つ膨出部の重複部分が、
前後方向に移動し、膨出部の重複部分に挟まれる薄肉ゴ
ム２０３が存在する場合にはその薄肉ゴム２０３を介し
て相互に衝突して、前記引張力Ｆ_A による芯金の前後方
向の変位を阻止する。即ち、前記膨出部が芯金の前後方
向変位に対するストッパ−として機能してゴムクロ−ラ
の伸長を一定限度以下に抑制する。また、横方向の力Ｆ
_B が作用する場合では、前記膨出部が、左右方向に移動
し、該膨出部の重複部分間に薄肉ゴム２０３がある場合
にはその薄肉ゴム２０３を介して相互に衝突して、前記
横方向力Ｆ_B による芯金の左右方向の変位を阻止する。
即ち、前記膨出部が芯金の左右方向変位に対するストッ
パ−として機能して左右方向の変位を一定限度以下に阻
止してゴムクロ−ラの脱輪を防止する。That is, as shown in FIG. 9 which is an enlarged schematic view of the bulging portion when the crawler according to the present invention is viewed from the inside in plan view, the bulging portion 20 protruding from the adjacent core metal and facing each other.
When a tensile force F _A in the front-rear direction acts on Nos. 1 and 202, the overlapping portion of the bulging portion having a ridgeline inclined at the overlapping angles θ ₁ and θ ₂ exceeding 90 ° with respect to the width direction of the rubber crawler,
When there is a thin rubber 203 that moves in the front-rear direction and is sandwiched between overlapping portions of the bulging portion, the thin rubber 203 collides with each other through the thin rubber 203 and the core metal is displaced in the front-rear direction by the tensile force F _A. Prevent. That is, the bulging portion functions as a stopper against the displacement of the cored bar in the front-rear direction to suppress the expansion of the rubber crawler to a certain limit or less. Also, the lateral force F
_{When B} acts, the bulging portion moves in the left-right direction, and when there is a thin rubber 203 between the overlapping portions of the bulging portion, they collide with each other through the thin rubber 203, The lateral displacement of the core metal due to the lateral force F _B is prevented.
That is, the bulging portion functions as a stopper against the lateral displacement of the core metal, and prevents the lateral displacement below a certain limit to prevent the rubber crawler from slipping off.

【００１１】しかも本発明においては、前記前後方向の
引張力Ｆ_A によって、抗張体としてのスチ−ルコ−ドを
破断するような過剰な伸長変形がゴムクロ−ラに発生し
ないようにするために、芯金膨出部の重複部分の前後方
向の移動量が一定量以下となるように工夫されている。
即ち、図９において、引張力Ｆ_A を受けて隣接芯金の膨
出部の重複部分が衝突するまでの前後方向移動量をＸ、
芯金の個数をＮ、クロ−ラの全長に亙って埋設されるス
チ−ルコ−ドの長さをＬ、スチ−ルコ−ドの破断伸びを
Ｅ（％）、隣接芯金の膨出部の重複部分間の幅方向距離
をＹ、重複角度をθとすると、ゴムクロ−ラの伸長量が
スチ−ルコ−ドの破断伸び以下であるためには、 Ｘ＜（Ｌ×Ｅ）／１００Ｎ ここで、Ｘ＝Ｙｔａｎ（１８０−θ） の関係となるので、クロ−ラの全長（即ち、Ｌ）、スチ
−ルコ−ドの破断伸びＥ、芯金の個数Ｎ、隣接芯金の膨
出部の重複部分間の幅方向距離Ｙをゴムクロ−ラの設計
仕様に基づいて設定することによって、重複角度θの範
囲が求められる。本発明では、発明者によって車両仕様
とゴムクロ−ラの形状及び材料特性の組合わせについて
種々の研究がなされ、これらＬ、Ｅ、Ｎ、Ｙの値を実用
性のある値に設定した場合の前記重複角度の範囲が究明
され、この範囲を９０°を越える角度、しかも好ましく
は１００°以上とするのが良いとの結論を得た。尚、一
方で前記重複角度を過度に大きくとると膨出部の大きさ
を増大させゴムクロ−ラの屈曲性を阻害する虞が発生す
るために、ほぼ１３５°を越えないようにするのが好ま
しい。Further, in the present invention, in order to prevent the rubber crawler from being excessively stretched and deformed by the tensile force F _{A in the} front-rear direction to break the steel cord as a tensile body. It is devised so that the amount of movement in the front-rear direction of the overlapped portion of the core metal bulging portion is less than a certain amount.
That is, in FIG. 9, the amount of movement in the front-rear direction until the overlapping portion of the bulging portions of the adjacent cores collides with the tensile force F _A is X,
The number of cores is N, the length of the steel cord embedded over the entire length of the crawler is L, the elongation at break of the steel cord is E (%), and the bulge of the adjacent cores If the distance in the width direction between the overlapping portions of the parts is Y and the overlapping angle is θ, the elongation amount of the rubber crawler is equal to or less than the breaking elongation of the steel cord, so that X <(L × E) / 100N Here, since X = Ytan (180-θ), the total length of the crawler (that is, L), the elongation at break E of the steel cord, the number N of cores, and the bulge of adjacent cores The range of the overlapping angle θ can be obtained by setting the widthwise distance Y between the overlapping portions of the parts based on the design specifications of the rubber crawler. In the present invention, the inventor has conducted various studies on the combination of vehicle specifications and the shape and material properties of the rubber crawlers, and when the values of L, E, N and Y are set to practical values, The range of the overlapping angle was investigated, and it was concluded that this range should be an angle exceeding 90 °, and more preferably 100 ° or more. On the other hand, if the overlapping angle is excessively large, the size of the bulging portion may be increased and the flexibility of the rubber crawler may be hindered. Therefore, it is preferable not to exceed approximately 135 °. .

【００１２】また、本発明に係るゴムクロ−ラにおいて
は、各隣接芯金間の対向する膨出部間に弾性体ゴムを接
着介在させた場合には、ゴムクロ−ラの左右、前後方向
の外力に対して前記弾性ゴムが有効に抵抗して夫々の方
向の芯金変位を抑制する。即ち、図９に示される如く、
左右方向の横力Ｆ_B に対しては前記膨出部の重複部分間
の弾性体ゴム２０３の圧縮反力によって左右方向の変位
が抑制されると共に、前後方向の圧縮力−Ｆ_A に対して
は本発明の重複角度によって形成される膨出部先端の広
い端面２０４、２０５と対向する芯金２０７、２０６間
に介在される弾性体ゴム２０８、２０９に大きな圧縮反
力が発生して前後方向の芯金間の収縮変位が抑制されて
クロ−ラの弛みが減少されることによって、ゴムクロ−
ラの脱輪が効果的に防止される。また、前後方向の引張
力Ｆ_A に対しては、本発明の重複角度で傾斜する重複部
分間に挟まれる弾性体ゴム２０３に圧縮反力の成分が発
生して、芯金変形に対する芯金重複部分の前記ストッパ
−効果を助長し、ゴムクロ−ラの前後方向の伸長を抑制
する。Further, in the rubber crawler according to the present invention, when elastic rubber is adhered between the bulging portions of the adjacent cores facing each other, the external force in the left and right and front and rear directions of the rubber crawler is increased. On the other hand, the elastic rubber effectively resists and suppresses the displacement of the core metal in each direction. That is, as shown in FIG.
With respect to the lateral force F _{B in the} left-right direction, displacement in the left-right direction is suppressed by the compression reaction force of the elastic rubber 203 between the overlapping portions of the bulging portions, and with respect to the compression force −F _{A in the} front-back direction. Indicates a large compression reaction force in the elastic rubbers 208 and 209 interposed between the metal cores 207 and 206 facing the wide end surfaces 204 and 205 of the bulge portions formed by the overlapping angle of the present invention, and the front-back direction. The contraction displacement between the metal cores is suppressed and the slack of the crawlers is reduced, so that
The derailment of La is effectively prevented. Further, with respect to the tensile force F _A in the front-rear direction, a component of the compression reaction force is generated in the elastic rubber 203 sandwiched between the overlapping portions that are inclined at the overlapping angle of the present invention, and the core metal overlaps against the core metal deformation. It promotes the stopper effect of the part and suppresses the expansion and contraction of the rubber crawler in the front-rear direction.

【００１３】また、請求項２に記載する様に、隣接する
芯金の両端部から突出する膨出部の先端形状を相互に入
り子状の凹凸に形成しその凹部の一端側に凸部を通過さ
せる切欠きを設ける構成とした場合には、上記請求項１
に記載のゴムクロ−ラがもたらす作用効果に加えて、一
組の入り子状膨出部によって左右方向どちらの方向の横
力に対しても前記膨出部先端の凹凸部が互いに衝突して
夫々の方向の芯金変位を抑制でき、しかも、駆動輪や遊
動輪にゴムクロ−ラが巻き付けられる際のクロ−ラの内
外方向の曲げ変形に対しては、前記凹部に設けられた切
欠から前記凸部が抜け出ることによって、ゴムクロ−ラ
がスム−スに屈曲されて芯金及び膨出部周辺のゴム弾性
体の局部歪みが減少しゴムクロ−ラの疲労耐久性が向上
する。Further, as described in claim 2, the tip shapes of the bulging portions projecting from both ends of the adjacent cored bar are formed into mutually concavo-convex concaves and convexes at one end side of the concaves. When the notch is provided to allow passage, the above-mentioned claim 1
In addition to the action and effect provided by the rubber crawler described in (1), the concave-convex portions at the tips of the bulging portions collide with each other against lateral force in either the left or right direction by the pair of nest-like bulging portions. The displacement of the core metal in the direction of can be suppressed, and the bending deformation in the inner and outer directions of the roller when the rubber roller is wound around the drive wheel or the idler wheel is prevented from the protrusion provided from the notch provided in the recess. By pulling out the portion, the rubber crawler is smoothly bent, the local strain of the rubber elastic body around the cored bar and the bulging portion is reduced, and the fatigue durability of the rubber crawler is improved.

【００１４】[0014]

【実施例】図１乃至図３に基づいて本発明に係る実施例
１のゴムクロ−ラを説明する。図１は、実施例１のゴム
クロ−ラ１を内面視しその長手方向の一部を示す平面図
であって、無端状ゴム弾性体２の内部に埋設される複数
の芯金３がゴムクロ−ラ１の長手方向に一定間隔をもっ
て配列されている。各芯金３間のゴムクロ−ラ１の中央
部分には、無限軌道車の駆動輪及び遊動輪の歯に係合す
る係合孔４が設けられている。また、前記芯金３の翼部
５の下部には張力体としての複数本のスチ−ルコ−ド６
が配置されている。芯金３の中央部分には前記駆動輪及
び遊動輪の歯と噛合する係合部７が形成され、その両脇
にはゴム弾性体２からゴムクロ−ラ１の内面側に突出す
る左右一対のガイドレ−ル８、８、が形成されている。
そして、この左右のガイドレ−ル８、８を跨いで案内輪
（図示省略）が走行するようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rubber crawler according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing a part of a longitudinal direction of the rubber crawler 1 of the first embodiment, in which a plurality of cored bars 3 embedded in an endless rubber elastic body 2 are rubber crawler. La 1 are arranged at regular intervals in the longitudinal direction. An engagement hole 4 that engages with the teeth of the drive wheel and the idler wheel of the endless track vehicle is provided in the central portion of the rubber crawler 1 between the cores 3. In addition, a plurality of steel cords 6 as tension members are provided below the wings 5 of the core metal 3.
Is arranged. Engagement portions 7 that mesh with the teeth of the drive wheel and the idler wheel are formed in the central portion of the cored bar 3, and a pair of left and right parts protruding from the rubber elastic body 2 to the inner surface side of the rubber crawler 1 are formed on both sides of the engagement parts 7. Guide rails 8, 8 are formed.
A guide wheel (not shown) runs across the left and right guide rails 8.

【００１５】ゴムクロ−ラ１の長手方向の芯金３の両端
部において、図１及び図２に示される如く、その一方の
端部には前記一対のガイドレ−ル８、８の下部に左右一
対の角柱状の内膨出部９、９が設けられ、他方の端部に
は前記ガイドレ−ル８、８の下部に左右一対の角柱状の
外膨出部１０、１０が設けられている。そして、隣接す
る芯金間において、一方の芯金の外膨出部１０と他方の
芯金の内膨出部９とが接近して各々の一部分がゴムクロ
−ラ１の幅方向に重複して対峙され、膨出部が重複する
部分の間には薄肉ゴム１１が挟着されている。As shown in FIGS. 1 and 2, at both ends of the core 3 in the longitudinal direction of the rubber crawler 1, one end thereof has a pair of left and right guides under the pair of guide rails 8, 8. The prism-shaped inner bulging portions 9 and 9 are provided, and the other end portion is provided with a pair of left and right prism-shaped outer bulging portions 10 and 10 below the guide rails 8 and 8. Then, between the adjacent cores, the outer bulge portion 10 of one core metal and the inner bulge portion 9 of the other core metal come close to each other, and a part of each overlaps in the width direction of the rubber crawler 1. The thin rubber 11 is sandwiched between the portions facing each other and overlapping with each other.

【００１６】尚、前記膨出部９、１０は、芯金３の中央
部でしかもゴムクロ−ラ１の長手方向の曲げの中立層と
なるスチ−ルコ−ド６の層とほぼ同一位置に配置される
ことが好ましい。The bulging portions 9 and 10 are arranged in the central portion of the core metal 3 and at substantially the same position as the layer of the steel cord 6 which is a neutral layer for bending the rubber crawler 1 in the longitudinal direction. Preferably.

【００１７】そして、隣接芯金間に重複対峙される一組
の膨出部９、１０の拡大図である図３に示されるよう
に、内膨出部９の重複側の稜線とゴムクロ−ラ１の幅方
向即ち芯金３の長手方向の稜線とが為す重複角度θ₁
と、同様に定義される外膨出部の重複角度θ₂ とは同一
角度１２０度に設定されている。Then, as shown in FIG. 3, which is an enlarged view of a pair of bulging portions 9 and 10 that are opposed to each other between the adjacent cores, a ridge line on the overlapping side of the inner bulging portion 9 and a rubber crawler. The overlapping angle θ _{1 formed by} the ridge line in the width direction of ₁
And the overlapping angle θ ₂ of the outer bulging portions, which is similarly defined, are set to the same angle of 120 degrees.

【００１８】本発明に係る実施例１のゴムクロ−ラで
は、上記の様に構成されているので、大きな又は急激な
駆動力によって隣接する芯金３₁ 、及び３₂ 間に前後方
向の引張力Ｆ_A が作用すると、前記芯金３₁ 、及び３₂
が相互に離隔するように前後方向の変位を起こすが、隣
接する芯金から突出された膨出部９、１０の重複部分が
薄肉ゴム１１を介して相互に衝突すると共に前記薄肉ゴ
ム１１の圧縮反力によって、その前後方向の伸長変位が
一定の量以内に止められ従ってスチ−ルコ−ド６の伸長
が抑制されてその破断が防止される。また、逆に大きな
又は急激な後退駆動力や路面上の突起乗り上げなどによ
って隣接する芯金３₁ 、及び３₂ 間に前後方向に弛みを
もたらす様な圧縮力−Ｆ_A が作用すると、対向する膨出
部９、１０の周辺の弾性体ゴムに圧縮反力が発生して芯
金間の収縮変位が抑制されることによって、ゴムクロ−
ラ１の弛みが防止され従って芯金の横変位が抑制されて
ゴムクロ−ラ１の脱輪が効果的に防止される。Since the rubber crawler according to the first embodiment of the present invention is constructed as described above, a large or abrupt driving force causes a tensile force in the front-rear direction between the adjacent metal cores 3 ₁ and 3 _2. When F _A acts, the cores 3 ₁ and 3 ₂
Are displaced in the front-rear direction so as to be separated from each other, but overlapping portions of the bulging portions 9 and 10 protruding from the adjacent core bar collide with each other through the thin rubber 11 and the thin rubber 11 is compressed. Due to the reaction force, the extensional displacement in the front-rear direction is stopped within a certain amount, so that the extension of the steel code 6 is suppressed and its breakage is prevented. On the contrary, if a compressive force -F _A that causes a slack in the front-rear direction acts between the adjacent cored bars 3 ₁ and 3 ₂ due to a large or abrupt retreat driving force or a protrusion on the road surface, they oppose each other. A compressive reaction force is generated in the elastic rubber around the bulging portions 9 and 10 to suppress the contraction displacement between the cores, so that the rubber black
The slack of the roller 1 is prevented, and therefore the lateral displacement of the cored bar is suppressed, and the wheel derailment of the rubber crawler 1 is effectively prevented.

【００１９】また、路面上の突起物乗り上げ、傾斜地走
行、急旋回走行などによって、隣接する芯金３₁ 、及び
３₂ 間に左右方向の横力Ｆ_B が作用すると、隣接する芯
金３ ₁ 、及び３₂ 間が左右の相対する方向に変位しよう
とするが、隣接する芯金から突出された膨出部９、１０
の重複部分が薄肉ゴム１１を介して相互に衝突すると共
に前記薄肉ゴム１１に圧縮反力が発生して、前記芯金の
左右方向の変位が一定の量以内に止められ、従ってゴム
クロ−ラ１の脱輪が防止される。[0019] In addition, riding on a projection on the road surface, running on a slope
Adjacent cored bar 3 due to running or sudden turning₁ ,as well as
3_Two Lateral lateral force F between_B When acted on, the adjacent wick
Money 3 ₁ , And 3_Two Let's displace the space in the left and right opposite directions
However, the bulging portions 9 and 10 protruding from the adjacent core metal
If overlapping parts of the two collide with each other through the thin rubber 11,
A compressive reaction force is generated in the thin rubber 11 and
Lateral displacement is stopped within a certain amount, so the rubber
It is possible to prevent the crawler 1 from slipping off.

【００２０】更にまた、本実施例では、前記膨出部９、
１０が弾性体ゴム２の内部に埋設されているので、ゴム
クロ−ラ１に前後方向の圧縮力や左右方向の横力を受け
て前記膨出部９、１０が衝突しようとする際には、該膨
出部間に介在する薄肉ゴム１１が緩衝材として働き前記
膨出部９、１０の損傷を防止する。Furthermore, in this embodiment, the bulging portion 9,
Since 10 is embedded inside the elastic rubber 2, when the bulging portions 9 and 10 try to collide with the rubber crawler 1 by receiving a compressive force in the front-rear direction and a lateral force in the left-right direction, The thin rubber 11 interposed between the bulging portions acts as a cushioning material and prevents the bulging portions 9 and 10 from being damaged.

【００２１】次に、本発明に係る実施例２を説明する。
実施例２では、実施例１の構成において膨出部の先端の
形状を凹凸の入り子状にしている。図４は、本実施例２
の芯金の平面図であり、図５は、本実施例２の膨出部の
先端部分の斜視図である。図４に示されるように、本実
施例では、芯金３のゴムクロ−ラ１の長手方向の両端部
の各々に膨出部１２、１３が設置されるが、芯金３₁ の
一方の端部及び芯金３₂ の他方の端部から突出される膨
出部１２の凸状の先端１４が、芯金３₁ の他方の端部及
び芯金３₂ の一方の端部から突出される膨出部１３の凹
状の先端１５に挟持される様に配置されている。そし
て、これらの膨出部１２、１３は、芯金と共にゴムクロ
−ラのゴム弾性体内に埋設されている。また、図５の芯
金の一部拡大斜視図において、前記凸状の先端１４は底
部の幅Ｌ₁ より頂部の幅Ｌ₂ の方が広い逆梯形型断面を
持つ角柱状とされ、前記凹部の先端１５は鳩溝状の凹部
とされしかもゴムクロ−ラの表面に垂直方向の両端部１
６、１６｀が同形状に開口する切欠き１７、１７｀とさ
れている。また、前記凸部の先端１４の前記重複角度θ
₁ 及び前記凹部の先端１５の前記重複角度θ₂ は、共に
１２０度に設定されている。Next, a second embodiment according to the present invention will be described.
In the second embodiment, in the configuration of the first embodiment, the shape of the tip of the bulging portion is a concave and convex shape. FIG. 4 shows the second embodiment.
5 is a plan view of the core metal of FIG. 5, and FIG. 5 is a perspective view of a tip portion of the bulging portion of the second embodiment. As shown in FIG. 4, in the present embodiment, the bulging portions 12 and 13 are provided at both ends of the rubber bar 1 of the core bar 3 in the longitudinal direction, but one end of the core bar 3 _1. Section and the protruding tip 14 of the bulging portion 12 protruding from the other end of the cored bar 3 ₂ are projected from the other end of the cored bar 3 ₁ and one end of the cored bar 3 _2. It is arranged so as to be sandwiched by the concave tip 15 of the bulging portion 13. And these bulging parts 12 and 13 are embedded in the rubber elastic body of a rubber crawler with the core metal. Further, in the partially enlarged perspective view of the cored bar of FIG. 5, the convex tip 14 is formed into a prismatic shape having an inverted trapezoidal cross section in which the width L _{2 at} the top is wider than the width L _{1 at the} bottom. 15 is a dovetail-shaped recess, and both ends 1 in the direction perpendicular to the surface of the rubber crawler.
The notches 17 and 17 ″ are formed so that the openings 6 and 16 ″ have the same shape. In addition, the overlapping angle θ of the tip 14 of the convex portion
_The overlapping angle θ ₂ of ₁ and the tip 15 of the recess is both set to 120 degrees.

【００２２】実施例２では、膨出部が上記のように構成
されているので、ゴムクロ−ラ１に前後方向の引張力又
は圧縮力又は左右方向の横力を受けた場合に前記実施例
１の場合と同様な作用効果を得ることが出来ることに加
え、特に、左右方向の横力を受けた場合には、左右どち
らの方向から横力を受けようとも、一組の入り子状膨出
部によって両方向の芯金変位を抑制できるという利点を
発揮できる。しかも、駆動輪や遊動輪にゴムクロ−ラが
巻き付けられる際のゴムクロ−ラの内外方向の曲げ変形
に対しては、前記凹部に設けられた切欠から前記凸部が
抜け出ることが出来るので、ゴムクロ−ラがスム−スに
屈曲されて芯金及び膨出部周辺のゴム弾性体の局部歪み
が減少してゴムクロ−ラの疲労耐久性が向上する。In the second embodiment, since the bulging portion is constructed as described above, when the rubber crawler 1 receives a tensile force or a compressive force in the front-rear direction or a lateral force in the left-right direction, the first embodiment is described. In addition to being able to obtain the same effect as in the case of, in particular, when a lateral force in the left and right direction is applied, no matter which side the lateral force is applied, a pair of nested bulges It is possible to exert an advantage that the displacement of the core metal in both directions can be suppressed by the portion. Moreover, when the rubber crawler is wound around the drive wheel or the idler wheel, the convex portion can be pulled out from the notch provided in the concave portion against bending deformation in the inner and outer directions of the rubber crawler. The rubber is bent smoothly, and the local strain of the rubber elastic body around the cored bar and the bulging portion is reduced to improve the fatigue durability of the rubber crawler.

【００２３】図６は本発明の主旨に沿う実施例３のゴム
クロ−ラの芯金部分をゴムクロ−ラの内周側から見た時
の平面図であり、また、図７はそのＡ−Ａ断面図であ
る。図６に示される如く、本実施例では、クロ−ラの周
方向に配列される芯金において隔個毎に左側又は右側と
なる一方の翼部に図中上向きに膨出部１２が設けられ、
同様に芯金の隔個毎に左側又は右側となる他方の翼部に
は前記膨出部１２を入り子状に挟持する一対の膨出部１
３、１３が図中下向きに設けられている。そして、これ
らの膨出部１２、１３、１３は、芯金と共にゴムクロ−
ラのゴム弾性体内に埋設されている。また、前記膨出部
１２の先端が前記膨出部１３、１３に挟持された時の状
態は図５に示される実施例２の状態と略同様とされてい
て、膨出部１２の重複角度θ₁ 及び膨出部１３、１３の
重複角度θ₂ は夫々１２０度に設定されている。FIG. 6 is a plan view of a core bar portion of a rubber crawler according to a third embodiment of the present invention as viewed from the inner peripheral side of the rubber crawler, and FIG. 7 is its AA line. FIG. As shown in FIG. 6, in the present embodiment, the bulging portion 12 is provided upward in the drawing on one of the blades, which is on the left side or the right side of the cored bar arranged in the circumferential direction of the crawler, for every other piece. ,
Similarly, a pair of bulging portions 1 for sandwiching the bulging portion 12 in a nested shape is provided on the other wing portion on the left side or the right side of each of the separated core bars.
3, 13 are provided downward in the figure. And these bulging parts 12, 13, and 13 are rubber black with a core metal.
It is embedded in the rubber elastic body of LA. The state when the tip of the bulging portion 12 is sandwiched between the bulging portions 13 and 13 is substantially the same as the state of the second embodiment shown in FIG. The overlapping angle θ ₂ between θ ₁ and the bulging portions 13 and 13 is set to 120 degrees, respectively.

【００２４】しかも、本実施例においては、図７のＡ−
Ａ断面図に示される如く、膨出部１２の断面では、ゴム
クロ−ラの内周側の幅が狭く、他方外周側の幅は広く設
定され、しかも、中間部分には膨出部１３に対面する壁
面に段差となる傾斜面１８が設けられている。また、膨
出部１３、１３が成す断面では、前記膨出部１２の断面
形状に対応して、ゴムクロ−ラの内周側に相当する部分
の開口部１９の開口幅が狭く、外周側に相当する部分の
開口部２０の開口幅は広く設定され、しかも、中間部分
には前記膨出部１２の傾斜面１８に対向する傾斜面２１
が形成されている。Moreover, in the present embodiment, A- in FIG.
As shown in the sectional view A, in the cross section of the bulging portion 12, the width on the inner peripheral side of the rubber crawler is set to be narrow, while the width on the outer peripheral side is set to be wide, and the bulging portion 13 faces the middle portion. An inclined surface 18 that serves as a step is provided on the wall surface. Further, in the cross section formed by the bulging portions 13 and 13, the opening width of the opening portion 19 of the portion corresponding to the inner peripheral side of the rubber crawler is narrower and the outer peripheral side is corresponding to the sectional shape of the bulging portion 12. The opening width of the opening 20 of the corresponding portion is set to be wide, and the inclined surface 21 facing the inclined surface 18 of the bulging portion 12 is provided in the middle portion.
Are formed.

【００２５】実施例３のゴムクロ−ラは上記の如く構成
されているので、実施例１及び２で記述したと同様の作
用効果を得ると共に、路面上の岩石などの異物に乗り上
げてゴムクロ−ラが捩れ変形を受けた場合には、膨出部
１２が、図７中点線で示される様に、膨出部１３に対し
て相対変位して前記両膨出部の傾斜面１８、２１が接触
干渉し合い、その捩れ変形を抑制して、ゴムクロ−ラの
横ずれ従ってまた脱輪が効果的に防止される。Since the rubber crawler of the third embodiment is constructed as described above, the same operation and effect as those described in the first and second embodiments can be obtained, and the rubber crawler can be mounted on a foreign substance such as rock on the road surface. When the bulging portion 12 undergoes torsional deformation, the bulging portion 12 is displaced relative to the bulging portion 13 as shown by the dotted line in FIG. 7, and the inclined surfaces 18 and 21 of the both bulging portions come into contact with each other. They interfere with each other and suppress their torsional deformation, so that the lateral displacement of the rubber crawlers and, therefore, derailment are effectively prevented.

【００２６】上記実施例１乃至３では、隣接する芯金間
で対峙する膨出部の各々の重複角度を同一の角度とした
が、本発明の主旨からして、この各々の角度を別々に設
定することが出来る。In the first to third embodiments described above, the overlapping angles of the bulging parts facing each other between the adjacent cored bars are the same, but for the purpose of the present invention, these respective angles are separately set. Can be set.

【００２７】[0027]

【発明の効果】本発明に係るゴムクロ−ラでは、無端状
ゴム弾性体の内部に埋設される複数の芯金の各隣接芯金
間において、芯金の中央部に形成されるガイドレ−ル部
の下部から相互の芯金方向に膨出部を突出させて対峙さ
せ、しかもそれら膨出部の先端はクロ−ラの幅方向に重
複させて重複部の稜線がクロ−ラの幅方向と為す重複角
度を９０度を越える所定の角度範囲内に限定しているの
で、ゴムクロ−ラの前後方向即ち長手方向の外力を受け
た場合に、前記膨出部が有効に衝突して隣接芯金間の前
後方向の変移を規制してゴムクロ−ラ内部に埋設された
スチ−ルコ−ドの破断が防止される。また、前記前後方
向または横方向の外力を受けた場合に、芯金周辺の弾性
体ゴムの疲労損傷と前記膨出部の衝突による該膨出部自
体の損傷とを防止すると共に、芯金の横変位が効果的に
抑制されて、ゴムクロ−ラの脱輪を防止することができ
る。In the rubber crawler according to the present invention, the guide rail portion formed in the central portion of the cored bar between adjacent cored bars of a plurality of cored bars embedded in the endless rubber elastic body. The bulging parts project from the lower part of the ridge in the direction of the core to face each other, and the tips of these bulging parts overlap in the width direction of the crawler, and the ridge line of the overlapping part is formed in the width direction of the crawler. Since the overlapping angle is limited to a predetermined angle range exceeding 90 degrees, when the rubber crawler receives an external force in the front-rear direction, that is, the longitudinal direction, the bulging portion effectively collides with the space between the adjacent cores. Of the steel cord embedded in the rubber crawler is prevented by restricting the displacement in the front-back direction. Further, when receiving an external force in the front-rear direction or the lateral direction, it is possible to prevent fatigue damage to the elastic rubber around the core metal and damage to the bulging portion itself due to collision of the bulging portion, and Lateral displacement is effectively suppressed, and it is possible to prevent derailment of the rubber crawler.

【００２８】更に、隣接する芯金間に突出する前記膨出
部の先端形状を相互に入れ子状の凹凸形状とし、しかも
一方の膨出部の先端の凹部に、該凹部内から他方の膨出
部の先端の凸部がゴムクロ−ラ表面に垂直方向に通過自
在となる切欠きを設けた場合には、前記芯金の横変位が
より効果的に抑制されて脱輪が防止される上に、ゴムク
ロ−ラの屈曲性が向上して駆動輪や遊動輪にスム−スに
巻き付くことができゴム弾性体中に不要な応力歪みが発
生せずゴムクロ−ラの耐久性が向上する。更にまた、相
互に入れ子状に形成された膨出部の相対する壁面に段差
となる傾斜面を設けた場合には、隣接する芯金間の捩り
変形が防止されて異物踏み時の脱輪が効果的に防止され
る。Furthermore, the tip shapes of the bulging portions projecting between the adjacent cored bars are formed into concave and convex shapes which are nested with each other, and the concave portions at the tips of one bulging portion are bulged from the inside to the other concave portion. In the case where the convex portion at the tip of the portion is provided with a notch that allows the rubber crawler surface to pass in the vertical direction, the lateral displacement of the cored bar is suppressed more effectively, and derailment is prevented. The flexibility of the rubber crawler is improved so that it can be smoothly wrapped around the drive wheel or the idler wheel, and unnecessary stress strain does not occur in the rubber elastic body, and the durability of the rubber crawler is improved. Furthermore, when inclined surfaces that are steps are provided on the opposite wall surfaces of the bulging portions that are nested with each other, twisting deformation between adjacent core bars is prevented, and derailment when stepping on foreign matter is prevented. Effectively prevented.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係る実施例１のゴムクロ−ラ１を内面
視しその長手方向の一部を示す平面図。FIG. 1 is a plan view of a rubber crawler 1 according to a first embodiment of the present invention when viewed from the inside, and showing a part in the longitudinal direction thereof.

【図２】本発明に係る実施例１のゴムクロ−ラ１の断面
図である。FIG. 2 is a sectional view of a rubber crawler 1 according to a first embodiment of the present invention.

【図３】本発明に係る実施例１のゴムクロ−ラ１の一部
拡大破断平面図である。FIG. 3 is a partially enlarged cutaway plan view of the rubber crawler 1 according to the first embodiment of the present invention.

【図４】本発明に係る実施例２の芯金の内周側から見た
平面図である。FIG. 4 is a plan view seen from the inner peripheral side of a cored bar according to a second embodiment of the present invention.

【図５】本発明に係る実施例２の膨出部の斜視図であ
る。FIG. 5 is a perspective view of a bulging portion according to a second embodiment of the present invention.

【図６】本発明に係る実施例３の芯金の内周側から見た
平面図である。FIG. 6 is a plan view seen from the inner peripheral side of a cored bar according to a third embodiment of the present invention.

【図７】図６のＡ−Ａ断面を示す図である。7 is a diagram showing a cross section taken along the line AA of FIG.

【図８】従来のゴムクロ−ラが横外力を受けて変形する
状態を示す図である。FIG. 8 is a view showing a state in which a conventional rubber crawler is deformed by receiving a lateral external force.

【図９】ゴムクロ−ラをその内側から平面視した時の膨
出部の拡大模式図である。FIG. 9 is an enlarged schematic view of a bulging portion when the rubber crawler is viewed in plan from the inside.

【符号の説明】[Explanation of symbols]

１ ゴムクロ−ラ ２ 無端状ゴム弾性体 ３、３₁ 、３₂ 芯金 ４ 係合孔 ５ 翼部 ６ スチ−ルコ−ド ７ 係合部 ８、８｀ガイドレ−ル ９ 内膨出部 １０ 外膨出部 １１ 薄肉ゴム １２ 膨出部（凸先端を持つ） １３ 膨出部（凹先端を持つ） １４ 膨出部の先端（凸の） １５ 膨出部の先端（凹の） １６、１６｀ （凹部の）両端部 １７、１７｀ 切り欠き １８ 傾斜面 １９ 開口部（内周側） ２０ 開口部（外周側） ２１ 傾斜面1 Rubber Crawler 2 Endless Rubber Elastic Body 3, 3 ₁ , 3 ₂ Core Bar 4 Engagement Hole 5 Wing Part 6 Steel Code 7 Engagement Part 8, 8'Guide Rail 9 Inner Expansion Part 10 Outer Swelling part 11 Thin rubber 12 Swelling part (having convex tip) 13 Swelling part (having concave tip) 14 Swelling part tip (convex) 15 Swelling part tip (concave) 16, 16 ' Both ends (of the recess) 17, 17 'Notch 18 Sloping surface 19 Opening (inner peripheral side) 20 Opening (outer peripheral side) 21 Sloping surface

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 無端状ゴム弾性体と、その幅方向に延在
して埋設される複数の芯金とを有し、該芯金が前記無端
状ゴム弾性体の長手方向に相互に離隔して配置されるゴ
ムクロ−ラであって、隣接する前記芯金の各々から相対
する方向に膨出部が突出されて、相対する前記膨出部の
少なくとも一部がゴムクロ−ラの幅方向に重複され、し
かもゴムクロ−ラの平面視で各々の膨出部の重複する側
の稜線がゴムクロ−ラの幅方向となす内角、即ち夫々の
重複角度θ₁ 、θ₂ が、９０°を越える角度、好ましく
は１００°≦θ₁ 、θ₂ ≦１３５°の範囲にあることを
特徴とするゴムクロ−ラ。1. An endless rubber elastic body, and a plurality of cored bars which extend in the width direction and are embedded therein, wherein the cored bars are separated from each other in the longitudinal direction of the endless rubbery elastic body. In the rubber crawlers arranged in such a manner that the bulging portions are protruded in the opposite direction from each of the adjacent core bars, at least a part of the bulging portions facing each other overlap in the width direction of the rubber crawlers. In addition, in the plan view of the rubber crawler, the inner angles formed by the ridge lines on the overlapping sides of the respective bulging portions and the width direction of the rubber crawler, that is, the respective overlapping angles θ ₁ and θ ₂ are angles exceeding 90 °, Preferably, the rubber crawler is in the range of 100 ° ≦ θ ₁ and θ ₂ ≦ 135 °. 【請求項２】 隣接する前記芯金の各々から相対する方
向に突出される前記膨出部の先端が相互に凹凸を形成す
る入れ子状とされ、凹部を形成する前記先端の凹部内を
凸部を形成する前記先端がクロ−ラ表面にほぼ垂直方向
に通過し得るような切欠が、前記凹部を形成する先端の
少なくとも一方側に設けられている請求項第１項記載の
ゴムクロ−ラ。2. The protrusions of the bulging portions projecting in the opposite direction from each of the adjacent cores are nested so as to form concavities and convexities, and the protrusions are formed in the recesses of the tips forming the recesses. 2. The rubber crawler according to claim 1, wherein a notch is formed on at least one side of the tip forming the recess so that the tip forming the recess can pass in a direction substantially perpendicular to the surface of the crawler.