JP5164498B2 - Rubber track core and rubber track using the same - Google Patents

Rubber track core and rubber track using the same Download PDF

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JP5164498B2
JP5164498B2 JP2007247124A JP2007247124A JP5164498B2 JP 5164498 B2 JP5164498 B2 JP 5164498B2 JP 2007247124 A JP2007247124 A JP 2007247124A JP 2007247124 A JP2007247124 A JP 2007247124A JP 5164498 B2 JP5164498 B2 JP 5164498B2
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core
rubber
rubber crawler
guide
protrusion
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JP2009078581A (en
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寿一 野溝
靖夫 下薗
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Bridgestone Corp
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Bridgestone Corp
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Description

この発明は、無端状のゴム弾性体内に、それの幅方向への延在姿勢として所要のピッチで複数本配設されるゴムクローラ用芯金および、それを用いたゴムクローラに関するものであり、とくには、芯金の形状を簡単なものとしてそれを製造し易くする技術を提案するものである。   The present invention relates to an endless rubber elastic body, a plurality of core bars for rubber crawlers disposed at a required pitch as an extending posture in the width direction thereof, and a rubber crawler using the same. In particular, the present invention proposes a technique for making the mandrel simple and making it easy to manufacture.

ゴムクローラの無端状のゴム弾性体内に、強度部材としての、剛性材料からなる芯金の複数本を、ゴム弾性体の幅方向への延在姿勢として所定のピッチで配設することは従来から広く行われており、ここでは多くの場合、芯金に、それの長さ方向の中間部に位置して、ゴムクローラの内周面側へ突出する一対のガイド突起をもって転輪等の転動を案内させ、重量の支持に寄与させることとしている。   Conventionally, a plurality of cored bars made of a rigid material as a strength member are disposed in an endless rubber elastic body of a rubber crawler at a predetermined pitch as an extending posture in the width direction of the rubber elastic body. Here, in many cases, a roller such as a roller wheel is provided with a pair of guide protrusions that are located in the middle part of the metal core and project to the inner peripheral surface side of the rubber crawler. To help support weight.

ところで、このようなゴムクローラにあっては、クローラに、それの幅方向に向く外力が作用した場合に、特定の芯金がそれの長さ方向に変位することによって、芯金のガイド突起上を転動する転輪等が脱輪するおそれを取り除くべく、ゴム弾性体内に埋没したそれぞれの芯金を、ゴムクローラの延在方向に突出させて設けた前後のそれぞれの脱輪防止突起を相互に噛み合わせることで、各芯金の、ゴムクローラの幅方向への変位を防止することが一般的に行われている。   By the way, in such a rubber crawler, when an external force is applied to the crawler in the width direction, a specific core metal is displaced in the length direction thereof, so that the guide protrusion of the core metal is In order to remove the possibility of rolling wheels, etc. rolling, the front and rear protrusions provided on the front and rear of the core bars embedded in the rubber elastic body projecting in the extending direction of the rubber crawler are mutually connected. In general, it is generally performed to prevent displacement of each cored bar in the width direction of the rubber crawler.

そして、このような脱輪防止突起は、芯金の強度が最も高く、また、芯金相互、なかでも、ガイド突起相互の位置決め精度を最も高め得る、芯金の長さ方向中間部分の、ガイド突起の突設位置に極く近接させて設けることが通例であるため、ガイド突起と、脱輪防止突起とが、図６に、芯金の要部をゴムクローラの内周面側からの平面視で例示するように、芯金５１の長さ方向の中間部に突出形成される一対のガイド突起５２、すなわち、頂面５３の面積が小さく、裾野が次第に広がる形態を有し、しかも、転動輪等の、芯金相互の乗り換え移動を円滑ならしめるべく、芯金の中心軸線に対して前後方向の反対側に偏せて配設される一対の突起５２の、突出基部輪郭線５４が、クローラの延在方向に突出する、ともに対をなす前後の脱輪防止突起５５，５６の少なくとも一部に重なり合って位置する相対関係を有することがある。   Such a derailment prevention protrusion has the highest strength of the core metal, and can improve the positioning accuracy of the core bars, particularly the guide protrusions, in the middle portion in the longitudinal direction of the core metal. Since it is customary to provide the protrusions in close proximity to the protruding position, the guide protrusion and the anti-roll-out protrusion are shown in FIG. 6 as a plan view from the inner peripheral surface side of the rubber crawler. As illustrated in the figure, the pair of guide protrusions 52 projecting from the lengthwise intermediate portion of the cored bar 51, i.e., the top surface 53 has a small area and the base is gradually widened. A projecting base contour line 54 of a pair of protrusions 52 disposed so as to be biased to the opposite side in the front-rear direction with respect to the central axis of the cored bar in order to smooth the transfer movement between the cored bars such as a driving wheel, Protruding in the extending direction of the crawler, preventing wheel loss before and after pairing together It may have a relative relationship of position overlapping at least a portion of the force 55, 56.

ここで、ガイド突起５２との間で、このような重なり合い部分５７をもって位置することとなる前後の各脱輪防止突起５５，５６を、相互に隣接させて配設される芯金５１の脱輪防止突起に対して、十分な噛み合い深さをもって、多くはゴム弾性体を介して、図７に平面図で例示するように噛み合わせるに当っては、図では右側に位置するガイド突起５２の下方側部分に、脱輪防止突起５６の、図示のような入り込みを許容する、アンダーカット部ないしはえぐり部を設けることが必要になる。   Here, the wheel removal of the cored bar 51 that is disposed adjacent to each other between the front and rear removal prevention protrusions 55 and 56 that are located with the overlapping portion 57 between the guide protrusion 52 and the guide protrusion 52. In order to engage the prevention protrusion with a sufficient engagement depth, mostly via a rubber elastic body, as illustrated in a plan view in FIG. 7, the guide protrusion 52 located on the right side in FIG. It is necessary to provide the side portion with an undercut portion or a bore portion that allows the removal prevention protrusion 56 to enter as shown in the drawing.

ガイド突起５２の下方側部分に、このようなアンダーカット部ないしはえぐりを有する芯金を、たとえば鋳造によって製造する場合は、鋳型を前後方向、図６に示すところでは、図上の上下方向に二分割してなるものとしたときは、所要の形状の芯金５１を比較的容易に製造することができるものの、この場合は、ガイド突起５２の頂面５３上に、鋳型の割り位置に沿って芯金５１の長さ方向に延在するばりの発生が不可避となるため、そのばりの研削除去等なしには、ばり上を転動する転輪の振動によって、車両への乗心地が悪化することになるという問題があった。   When a core bar having such an undercut portion or a hollow is manufactured on the lower side portion of the guide projection 52 by, for example, casting, the mold is moved in the front-rear direction, and in the place shown in FIG. When it is divided, the cored bar 51 having a required shape can be manufactured relatively easily. In this case, on the top surface 53 of the guide projection 52, along the split position of the mold. The occurrence of a flash extending in the length direction of the cored bar 51 is inevitable, and the ride comfort on the vehicle deteriorates due to the vibration of the rolling wheels rolling on the flash without grinding or removing the flash. There was a problem of becoming.

この一方で、芯金５１を、それの平面視で上下に二分割してなる鋳型によって製造するときは、ガイド突起５２の下方側部分への、前述したようなアンダーカットないしはえぐり部の成形のために、たとえば図８（ａ）に示すように、鋳型６１の上下型６２，６３の割り位置レベル６４を、アンダーカット等の成形部分で、他の割り位置レベルより高くすることが必要になるとともに、図８（ｂ）に断面図で例示するように、その割り位置レベル６４の高い部分で、下型６３のアンダーカット成形部分６３ａを、上下型６２，６３で区画されるキャビティ６５内へ、必要なアンダーカット量に対応する量だけ突出させて形成することが必要になるため、上述したような、突起頂面６３上へのばりの発生はないものの、鋳型および芯金それ自体が造り難いことに加え、鋳型それ自体の、割り位置レベル６４の変化、アンダーカット成形部分６３ａの形成が、鋳型の、摩耗等に起因する耐久性の低下をもたらすことになるという問題があった。   On the other hand, when the cored bar 51 is manufactured by a mold that is divided into two parts in the upper and lower parts in a plan view, the undercut or the punched part is formed on the lower part of the guide protrusion 52 as described above. Therefore, for example, as shown in FIG. 8A, it is necessary to make the split position level 64 of the upper and lower molds 62 and 63 of the mold 61 higher than the other split position levels in the molding part such as undercut. 8B, the undercut molding portion 63a of the lower die 63 is inserted into the cavity 65 defined by the upper and lower dies 62 and 63 at the portion where the split position level 64 is high. However, since it is necessary to project by an amount corresponding to the required undercut amount, there is no occurrence of flash on the projection top surface 63 as described above, but the mold and the core metal itself. In addition to hard structure, the mold itself, a change in the split position level 64, formation of the undercut portion 63a is, the mold, there is a problem that would result in deterioration of the durability due to abrasion.

しかも、脱輪防止突起５５、５６の先端が相互に入り込む構造とするために、ガイド突起５２の形状が脱輪防止突起５５、５６の長さに制限されてしまって、脱輪性や屈曲疲労性に最適な設計ができないケースがあり、さらには、ガイド突起５２の下方側部分にアンダーカット部等を有する芯金５１を、ゴム弾性体内に所定のピッチで埋設してなるゴムクローラでは、それを、図９に略線断面図で例示するように、スプロケットやアイドラ等に巻掛けるに際し、脱輪防止突起の上側面と、ガイド突起５２の下方側部分のアンダーカット部５８との間に挟み込まれるゴム弾性体が圧縮変形を受けることになるため、ゴムクローラの巻掛け抵抗が大きくなって、駆動力のロスが大きくなるという他の問題もあった。   In addition, since the tips of the anti-derailing projections 55 and 56 are inserted into each other, the shape of the guide protuberance 52 is limited to the length of the anti-delaying projections 55 and 56. In some cases, the rubber crawler in which the core metal 51 having an undercut portion or the like in the lower portion of the guide protrusion 52 is embedded in the rubber elastic body at a predetermined pitch may not be possible. 9 is sandwiched between the upper side surface of the derailment prevention protrusion and the undercut portion 58 on the lower side portion of the guide protrusion 52 when wound on a sprocket, idler or the like, as illustrated in a schematic cross-sectional view in FIG. Since the rubber elastic body to be compressed is subjected to compression deformation, there is another problem that the winding resistance of the rubber crawler increases and the loss of driving force increases.

この発明は、従来技術が抱えるこのような問題点を解決することを課題とするものであり、それの目的とするところは、芯金形状を十分簡単なものとして、ガイド突起の下方側へのアンダーカット部等の形成を不要とすることで、芯金それ自体の製造および、鋳型等の金型の製造を容易にするとともに、金型の耐久性を十分に高め、併せて、駆動力のロスの増加を有効に防止できる、ガイド突起の頂面にばりを生じることもない、ゴムクローラ用芯金およびそれを用いたゴムクローラを提供するにある。   The present invention has an object to solve such problems of the prior art, and the object of the present invention is to make the core metal shape sufficiently simple so that the guide protrusion is formed on the lower side. By eliminating the need to form undercuts, etc., the core metal itself and the molds such as molds can be easily manufactured, and the durability of the mold is sufficiently enhanced. It is an object of the present invention to provide a rubber crawler core bar and a rubber crawler using the same, which can effectively prevent an increase in loss and does not cause a burr on the top surface of a guide projection.

この発明に係るゴムクローラ用芯金は、無端状のゴム弾性体内に、そのゴム弾性体の幅方向への延在姿勢として所定のピッチで複数本整列配設されるものであって、ゴムクローラの内周側へ突出する、たとえば一対のガイド突起と、ゴムクローラの延在方向へ突出する前後のそれぞれの脱輪防止突起との両者を、ゴムクローラの内周面側からの平面視で、長さ方向の中間部分に、少なくとも一部で上下方向に重ね合わせて形成するとともに、その重なり合い部分の前記平面視で、ガイド突起の突出基部の輪郭線を、脱輪防止突起を主とし、その輪郭線と重なる位置もしくは、その輪郭線より内側に延在させ、かつ、脱輪防止突起に重なるガイド突起の突出基部の輪郭線の先端部を、脱輪防止突起の先端部よりも芯金の中心軸線側に配置させてなるものであり、脱輪防止突起に対してガイド突起を従としたものである。 A rubber crawler cored bar according to the present invention is arranged in a plurality of endless rubber elastic bodies at a predetermined pitch as an extending posture in the width direction of the rubber elastic body. For example, a pair of guide protrusions projecting toward the inner peripheral side of the rubber crawler, and both the front and rear protrusion prevention protrusions projecting in the extending direction of the rubber crawler, in plan view from the inner peripheral surface side of the rubber crawler, At least part of it is overlapped in the vertical direction at the middle part in the length direction, and in the plan view of the overlapping part, the outline of the protruding base part of the guide protrusion is mainly composed of the anti-roll-off protrusion, The leading end of the contour line of the protruding base of the guide projection that extends to the position that overlaps the contour line or inwardly from the contour line and that overlaps the anti-derailing projection is more so arranged to the central axis side A shall, in which the guide protrusion and slave against derailing prevention projection.

ここで好ましくは、一対のガイド突起を、芯金の長さ中心位置からともに等しい間隔をおいた二個所で、芯金の中心軸線に対し、平面視で、前後の、相互に反対側に偏せて設けるとともに、少なくとも一方のガイド突起の下方側に、ともに対をなす前後の脱輪防止突起のいずれか一本を突出形成してなる。   Here, it is preferable that the pair of guide protrusions be deviated to the opposite sides in the plan view with respect to the central axis of the cored bar at two locations that are equally spaced from the central position of the length of the cored bar. And at least one guide protrusion is formed on the lower side with at least one of the front and rear wheel-out prevention protrusions that form a pair.

また、この発明に係るゴムクローラは、上述したいずれかのゴムクローラ用芯金の複数本を、無端状のゴム弾性体内で、それの幅方向への延在姿勢とするとともに、前後のそれぞれの脱輪防止突起の、ゴム弾性体を介した、たとえば雌雄等の噛み合い状態として、所定のピッチで配設してなるものである。   Further, the rubber crawler according to the present invention is configured such that any one of the above-described rubber crawler cores has an endless rubber elastic body and its extending posture in the width direction, and each of the front and rear For example, the male / female and the like are engaged with each other through the rubber elastic body, and the anti-derailing protrusions are arranged at a predetermined pitch.

この発明に係るゴムクローラ用芯金では、とくに、芯金の平面視で、型抜き等の都合上裾広がりとなるガイド突起の基部輪郭線を、脱輪防止突起の輪郭線上もしくはそれより内側に延在させ、かつ、脱輪防止突起に重なるガイド突起の突出基部の輪郭線の先端部を、脱輪防止突起の先端部よりも芯金の中心軸線側に配置させることにより、隣り合わせに配設される芯金の、前後のそれぞれの脱輪防止突起の噛み合い深さを十分に確保してなお、そのガイド突起の下方側部分へのアンダーカット部ないしはえぐり部の形成が不要となるので、芯金それ自体の構造を簡単なものとして、芯金コストを有利に低減させることができ、また、その芯金を、上下分割型の鋳型等の金型によって製造する場合にも、金型の割り位置レベルを全体にわたって一定のものとするとともに、金型に、キャビティ内への局部的な突出部分を設けることが不要になるので、金型構造をもまた簡単なものとすることができ、その金型の耐久性を大きく向上させることができる。 In the rubber crawler core bar according to the present invention, in particular, the base contour line of the guide protrusion that is widened for convenience of die cutting or the like in the plan view of the core metal is on or inside the contour line of the anti-roll-out protrusion. extended, and the tip portion of the contour of the projecting base of the guide protrusions overlapping the derailing prevention protrusion, the Rukoto is disposed to the central axis side of the core metal from the tip portion of the derailing prevention projection, side by side in the distribution Since the core metal to be provided has a sufficient engagement depth between the front and rear derailment prevention projections, it is not necessary to form an undercut portion or a bore portion on the lower portion of the guide projection, The structure of the metal core itself can be simplified, and the metal core cost can be advantageously reduced. Also, when the metal core is manufactured by a mold such as a vertically split mold, Split position level throughout In addition, it is not necessary to provide the mold with a local protruding part into the cavity, so that the mold structure can be simplified and the durability of the mold is ensured. Can be greatly improved.

しかも、前後分割型の金型を用いるまでもなく、上下分割型の金型をもって、所期した通りの形状の芯金を確実に製造することができるので、ガイド突起の頂面上へのばりの発生に起因する、乗心地の低下を生じることもない。   In addition, it is not necessary to use a front / rear split mold, and the core metal having the expected shape can be reliably manufactured with the upper / lower split mold, so that the guide protrusion can be placed on the top surface. There is also no reduction in ride comfort due to the occurrence of

このような芯金において、一対のガイド突起を、芯金の中心軸線に対し、平面視で相互に反対側に偏せて設けたときは、転輪の、相互に隣り合わせに配設された芯金の一方から他方への乗り移りを十分円滑に行なわせることができる。
また、芯金に、ともに対をなす前後の脱輪防止突起を設けたときは、隣り合う芯金の脱輪防止突起を雌雄の相対関係、互い違いの入り込み関係等によって噛み合わせることで、芯金の相互を、軸線方向のいずれかの方向の変位に対しても有効に干渉させることができる。
この場合、いずれか一本の脱輪防止突起をガイド突起の下方側に形成することで、高い芯金強度の下で、芯金相互をすぐれた精度で位置決めすることができる。 In such a core bar, when the pair of guide protrusions are provided so as to be offset from each other in a plan view with respect to the central axis of the core bar, the cores disposed adjacent to each other of the rolling wheels Transfer from one gold to the other can be made sufficiently smoothly.
In addition, when the core metal bars are provided with the front and rear anti-derailing protrusions that make a pair, the core metal bars are engaged with each other by engaging the male and female relative relations, staggered entry relations, etc. Can effectively interfere with displacement in any of the axial directions.
In this case, by forming any one derailment prevention protrusion on the lower side of the guide protrusion, the core bars can be positioned with high accuracy under high core bar strength.

また、この発明に係るゴムクローラでは、先に述べたいずれかの芯金を、ゴム弾性体内に所定のピッチで、かつ、脱輪防止突起の所要の噛み合い状態で配設することで、脱輪防止突起の、ガイド突起の下方側部分のアンダーカット部等への入り込みを排除できるので、ゴムクローラを、スプロケットやアイドラ等に巻掛けるに当っての、ゴム弾性体の不要の圧縮変形を防止して、駆動力のロスを十分小さく抑えることができる。   Further, in the rubber crawler according to the present invention, any of the core bars described above is disposed at a predetermined pitch in the rubber elastic body and in a required meshing state of the anti-derailing projection, thereby removing the wheel. The prevention protrusion can be prevented from entering the undercut of the lower part of the guide protrusion, preventing unnecessary elastic deformation of the rubber elastic body when the rubber crawler is wound around a sprocket or idler. Thus, the loss of driving force can be kept sufficiently small.

図1は、この発明に係る芯金の実施形態を、ゴムクローラの内周面側からの平面視で示す要部平面図であり、図中１は、芯金の全体を、２は、芯金本体から、ゴムクローラの内周面側へ突出させて設けた一対のガイド突起を、そして３，４は、ゴムクローラの延在方向に突出させて設けた、これもともに対をなすそれぞれの脱輪防止突起をそれぞれ示す。   FIG. 1 is a plan view of a main part showing an embodiment of a cored bar according to the present invention in a plan view from the inner peripheral surface side of a rubber crawler. In FIG. A pair of guide protrusions provided to protrude from the gold main body to the inner peripheral surface side of the rubber crawler, and 3 and 4 are provided to protrude in the extending direction of the rubber crawler. Each of the wheel removal prevention protrusions is shown.

ここで、一対のガイド突起２は、芯金１の長さ中心位置からともに等しい間隔をおいた二個所に突出形成してなり、前後の脱輪防止突起３，４のそれぞれは、これも芯金１の長さ中心位置からともに等しい間隔をおいた位置で、それぞれのガイド突起２の下方側の位置に突出形成してなる。   Here, the pair of guide protrusions 2 are formed so as to protrude from the central position of the length of the metal core 1 at two locations that are equally spaced from each other. The gold 1 is formed so as to protrude from the center position of the length of the gold 1 at a position that is equally spaced from each other at a position below the guide protrusions 2.

また、図示のそれぞれのガイド突起２は、芯金２の中心軸線ＣＬに対し、前後方向の相互に反対側に偏せて配設してなる。そして、ここではともに先細り形状とした図示のそれぞれの脱輪防止突起３，４のうち、前方側の一対の脱輪防止突起３は、図２に例示するように、後方側の一対の脱輪防止突起４の間に丁度嵌まり合う相対間隔をもって突出形成してなる。   The illustrated guide protrusions 2 are arranged so as to be biased to the opposite sides in the front-rear direction with respect to the central axis CL of the cored bar 2. In addition, among the illustrated anti-wheeling protrusions 3 and 4 that are both tapered here, the pair of anti-wheeling protrusions 3 on the front side is a pair of anti-wheeling wheels on the rear side as illustrated in FIG. The protrusions 4 are formed so as to protrude with a relative interval between the prevention protrusions 4.

さらにこの実施形態では、前方側に偏せて配設してなる、図では右側に位置する一方のガイド突起２につき、平坦な頂面５に連続する裾広がりの突出形態を有するこのガイド突起２の突出基部輪郭線６、なかでもとくに、脱輪防止突起３の上側に重なるそれの前方側部分６ａを、その脱輪防止突起３の輪郭線７と重なる位置もしくは、その輪郭線７より内側に延在させる。
また、後方側に偏せて配設してなる、図では左側に位置する突起２については、同様の裾広がりの突出形態をもつそれの突出基部輪郭線８、なかでも、脱輪防止突起４の上側に重なるそれの後方側部分８ａを、その脱輪防止突起４の輪郭線９と重なる位置もしくは、その輪郭線９より内側に延在させる。 Furthermore, in this embodiment, the guide projection 2 having a projecting form having a hem spreading continuously to the flat top surface 5 is provided for one guide projection 2 located on the right side in the drawing, which is arranged to be biased forward. In particular, the front portion 6a of the projecting base contour line 6 that overlaps the upper side of the anti-derailing projection 3 is positioned at the position overlapping the contour line 7 of the anti-derailing projection 3 or inside the contour line 7. Extend.
Further, the protrusion 2 located on the left side in the drawing, which is biased to the rear side, has a protruding base contour line 8 having a similar hem-expanding shape, and in particular, an anti-annulation protrusion 4. The rear side portion 8a that overlaps the upper side of the wheel is extended to a position that overlaps the contour line 9 of the derailment prevention protrusion 4 or to the inner side of the contour line 9.

芯金２をこのように構成した場合には、従来技術で述べたような、脱輪防止突起の十分な噛み合い深さを確保するための、ガイド突起の下方側部分のアンダーカット部ないしはえぐり部の形成が不要となって、芯金形状を単純化できることから、芯金コストおよび、芯金の製造に用いる金型のコストを低減できる他、その芯金２を上下分割型の鋳型等の金型によって製造する場合、図２に例示するように、金型１１の割り位置レベル１２を、金型１１の全体にわたって一定のものとし、しかも、その金型１１に、図８（ｂ）に示すように、キャビティ内へ局部的に突出する部分を設けることが不要となるので、金型１１の耐久性を高めることができる。
しかも、上下型からなる金型１１によって芯金を製造することで、ガイド突起２の頂面へのばりの発生を確実に阻止することができる。 When the metal core 2 is configured in this way, as described in the prior art, an undercut portion or an undercut portion of the lower portion of the guide projection for securing a sufficient meshing depth of the derailment prevention projection. The core metal shape can be simplified and the core metal cost and the cost of the metal mold used for manufacturing the metal core can be reduced. In the case of manufacturing by a mold, as illustrated in FIG. 2, the split position level 12 of the mold 11 is constant throughout the mold 11, and the mold 11 is shown in FIG. Thus, since it becomes unnecessary to provide the part which protrudes locally in a cavity, durability of the metal mold | die 11 can be improved.
Moreover, by producing the cored bar with the upper and lower molds 11, it is possible to reliably prevent the occurrence of flash on the top surface of the guide protrusion 2.

また、このような芯金２の複数本をゴム弾性体内に所定のピッチで配設してなるゴムクローラにあっては、相互に隣り合う芯金２の、それぞれの脱輪防止突起３，４は、図３に平面図で示すような相対関係をもつことになり、それらの突起３，４を深く噛み合せてなお、いずれの突起３，４もガイド突起２の下方側に入り込むことがないので、ゴムクローラを、スプロケットやアイドラ等に巻掛けることによって、そのクローラ内の芯金２が、図４に略線側面図で示すように相対変位しても、芯金２を埋め込むゴム弾性体を、圧縮変形から有効に開放することができるので、駆動力のロスを有利に抑制することができる。   Further, in a rubber crawler in which a plurality of such metal cores 2 are arranged at a predetermined pitch in a rubber elastic body, the respective escape prevention protrusions 3 and 4 of the metal cores 2 adjacent to each other are provided. 3 has a relative relationship as shown in a plan view in FIG. 3, and since the protrusions 3 and 4 are engaged deeply, none of the protrusions 3 and 4 enter the lower side of the guide protrusion 2. By wrapping the rubber crawler around a sprocket, idler, etc., even if the cored bar 2 in the crawler is relatively displaced as shown in a schematic side view in FIG. Since it can be effectively released from the compression deformation, loss of driving force can be advantageously suppressed.

図５は、他の実施例形態を示す図１と同様の平面図であり、これはとくに、脱輪防止突起の形成態様に変更を加えたものである。   FIG. 5 is a plan view similar to FIG. 1 showing another embodiment. In particular, FIG.

図５（ａ）に示す芯金２１は、前方側へ突出する一対の脱輪防止突起を、二本角の雌型突起２２ａと、一本角の雄型突起２２ｂとするとともに、これらの雌雄の突起２２ａ，２２ｂと芯金２１の軸線方向位置を同じくして後方側へ突出する一対の脱輪防止突起を、雄型突起２２ｂと対応させて設けた、二本角の雌型突起２３ａおよび、雌型突起２２ａと対応させて設けた、一本角の雄型突起２３ｂとし、そして、前後方向に偏せて配設した一対のガイド突起２４のうち、前方側に配設したガイド突起２４の突出基部輪郭線２５の、とくには前方側部分２５ａを、そのガイド突起２４の下方側の雄型突起２２ｂの輪郭線２６と重なる位置もしくは、その輪郭線２６より内側に延在させる一方、後方側に偏せて配設したガイド突起２４の突出基部輪郭線２７の、とくに後方側部分２７ａを、雄型突起２３ｂの輪郭線２８と重なる位置もしくは、その輪郭線２８より内側に延在させたものである。   The core metal 21 shown in FIG. 5 (a) has a pair of anti-roller protrusions protruding forward, which are a double-angle female protrusion 22a and a single-angle male protrusion 22b. A pair of female projections 23a having a double angle, and a pair of anti-roll-off projections protruding in the rear side with the same axial position of the projections 22a, 22b and the cored bar 21 corresponding to the male projection 22b, and The single-sided male projection 23b provided in correspondence with the female projection 22a, and the guide projection 24 arranged on the front side of the pair of guide projections 24 arranged offset in the front-rear direction. The protruding base portion contour line 25 of the guide projection 24, in particular, the front side portion 25a extends to the position overlapping the contour line 26 of the male projection 22b below the guide projection 24 or to the inside of the contour line 26, while Protruding base portion of the guide protrusion 24 arranged to be biased to the side Guo line 27, particularly the rear portion 27a, or the position overlapping with the contour 28 of the male projection 23b, is obtained by extending inward from the contour line 28.

このように構成してなる芯金２１は、ゴム弾性体内で、前方側の雌型突起２２ａと、後方側の雄型突起２３ｂとを噛み合わせ、また、前方側の雄型突起２２ｂと、後方側の雌型突起２３ｂとを噛み合わせて、所定のピッチで配設することでゴムクローラの構成に寄与することができる。   The metal core 21 configured as described above meshes with the front female projection 22a and the rear male projection 23b within the rubber elastic body, and the front male projection 22b and the rear By engaging the female projections 23b on the side and arranging them at a predetermined pitch, it is possible to contribute to the configuration of the rubber crawler.

そして、図５（ｂ）に示す芯金３１は、前方側へ突出する一対の脱輪防止突起３２の、芯金軸線方向の突設間隔を、後方側へ突出する一対の脱輪防止突起３３の内側に丁度嵌まり込む寸法とし、前方側に偏せて設けたガイド突起３４の突出基部輪郭線３５、なかでもそれの前方側部分３５ａを、前方側脱輪防止突起３２の一方側の輪郭線３６と重なる位置もしくは、その輪郭線３６より内側に延在させ、そして、後方側に偏せて設けたガイド突起３７の突出基部輪郭線３８、とくにはそれの後方側部分３８ａを、一方の脱輪防止突起３３の輪郭線３９と重なる位置もしくは、その輪郭線３９より内側延在させたものである。   The cored bar 31 shown in FIG. 5 (b) has a pair of anti-rolling projections 33 projecting backward from the projecting interval in the cored bar axial direction of the pair of anti-derailing projections 32 projecting forward. The protruding base portion contour line 35 of the guide projection 34 provided to be biased to the front side, in particular, the front side portion 35a thereof, is the contour on one side of the front-side derailment prevention projection 32. The projecting base contour line 38 of the guide projection 37, particularly the rear side portion 38a thereof, is provided on one side of the guide projection 37 so as to overlap the line 36 or extend inwardly from the contour line 36 and biased to the rear side. The position where the derailment prevention protrusion 33 overlaps with the contour line 39, or the inner side extends from the contour line 39.

このような構造の芯金３１は、図３に示すとほぼ同様の整列配置姿勢でゴムクローラの構成に寄与することができる。   The cored bar 31 having such a structure can contribute to the configuration of the rubber crawler with the substantially same alignment arrangement posture as shown in FIG.

ところで、図５に示す、これらのいずれの芯金２１，３１もガイド突起の下方側部分のアンダーカット部ないしはえぐり部を省略してなお、隣り合う芯金２１，３１の、前後の脱輪防止突起相互の、十分な深さにわたる噛み合わせを担保することができるので、これらの芯金によってもまた、形状の簡素化に由来する、前述した各種の効果を実現することができる。   By the way, in any of these core bars 21 and 31 shown in FIG. 5, the undercut portion or the hollow portion on the lower side portion of the guide projection is omitted, and the adjacent core bars 21 and 31 are prevented from removing the front and rear wheels. Since the engagement between the protrusions over a sufficient depth can be ensured, the various effects described above derived from the simplification of the shape can also be realized by these cored bars.

芯金の実施形態を示す要部平面図である。It is a principal part top view which shows embodiment of a metal core. 金型の割り位置レベルを例示する側面図である。It is a side view which illustrates the split position level of a metal mold | die. ゴムクローラ内での芯金の整列姿勢を示す平面図である。It is a top view which shows the alignment attitude | position of the metal core in a rubber crawler. ゴムクローラの巻掛け時の、そのゴムクローラ内の隣接芯金の相対変位姿勢を例示する略線側面図である。It is a rough line side view which illustrates the relative displacement attitude | position of the adjacent core metal in the rubber crawler at the time of winding of a rubber crawler. 芯金の他の実施形態を示す図１と同様の平面図である。It is the same top view as FIG. 1 which shows other embodiment of a metal core. 従来技術を例示する要部平面図である。It is a principal part top view which illustrates a prior art. 従来の芯金の整列姿勢を例示する平面図である。It is a top view which illustrates the alignment attitude | position of the conventional metal core. 芯金製造鋳型の、上下割り位置レベル等を例示する図である。It is a figure which illustrates the up-and-down split position level etc. of a mandrel manufacturing mold. ゴムクローラの巻掛け時の、ゴムクローラ内の隣接芯金の相対姿勢を例示する略線断面図である。It is an approximate line sectional view which illustrates the relative posture of the adjacent core metal in a rubber crawler at the time of winding of a rubber crawler.

符号の説明Explanation of symbols

１，２１，３１ 芯金
２，２４，３４，３７ ガイド突起
３，４，２２ａ，２２ｂ，２３ａ，２３ｂ，３２，３３ 脱輪防止突起
５ 頂面
６，８，２５，２７，３５，３８ 突出基部輪郭線
６ａ，２５ａ，３５ａ 前方側部分
８ｂ，２７ａ，３８ａ 後方側部分
７，９，２６，２８，３６，３９ 輪郭線
１１ 金型
１２ 割り位置レベル 1, 21, 31 Core metal 2, 24, 34, 37 Guide protrusion 3, 4, 22a, 22b, 23a, 23b, 32, 33 Derailment prevention protrusion 5 Top surface 6, 8, 25, 27, 35, 38 Projection Base contour lines 6a, 25a, 35a Front side portions 8b, 27a, 38a Rear side portions 7, 9, 26, 28, 36, 39 Contour line 11 Mold 12 Split position level

Claims (3)

無端状のゴム弾性体内に、そのゴム弾性体の幅方向への延在姿勢として所定のピッチで複数本配設されるゴムクローラ用芯金であって、
ゴムクローラの内周面側へ突出するガイド突起と、ゴムクローラの延在方向へ突出する前後のそれぞれの脱輪防止突起との両者を、ゴムクローラの内周面側からの平面視で、長さ方向の中間部分に、少なくとも一部で上下方向に重ね合わせて形成するとともに、その重なり合い部分の前記平面視で、ガイド突起の突出基部の輪郭線を、脱輪防止突起の輪郭線と重なる位置もしくは、その輪郭線より内側に延在させ、かつ、脱輪防止突起に重なるガイド突起の突出基部の輪郭線の先端部を、脱輪防止突起の先端部よりも芯金の中心軸線側に配置させてなるゴムクローラ用芯金。 An endless rubber elastic body is a core for a rubber crawler disposed at a predetermined pitch as an extending posture in the width direction of the rubber elastic body,
Both the guide protrusion protruding to the inner peripheral surface side of the rubber crawler and the front and rear anti-derailing protrusions protruding in the extending direction of the rubber crawler are long in plan view from the inner peripheral surface side of the rubber crawler. A position that overlaps the contour line of the protruding base portion of the guide protrusion with the contour line of the anti-derailing protrusion in the plan view of the overlapping portion, at least partially overlapping the vertical direction in the middle portion in the vertical direction. Alternatively, the tip end of the contour line of the protruding base of the guide projection that extends inward from the contour line and overlaps the anti-derailing projection is arranged closer to the central axis side of the core than the distal end of the anti-detent projection rubber track for the metal core to be allowed to. 一対のガイド突起を、芯金の長さ中心位置からともに等しい間隔をおいた二個所で、芯金の中心軸線に対し、平面視で相互に反対側に偏せて設けるとともに、少なくとも一方のガイド突起の下方側に、ともに対をなす前後の脱輪防止突起のいずれか一本を突起形成してなる請求項１に記載のゴムクローラ用芯金。   A pair of guide projections are provided at two locations that are equally spaced from the central position of the length of the cored bar and are offset from each other in plan view with respect to the central axis of the cored bar, and at least one guide 2. The rubber crawler core bar according to claim 1, wherein any one of front and rear anti-roll-off protrusions that form a pair is formed on the lower side of the protrusion. 請求項１もしくは２に記載のゴムクローラ用芯金の複数本を、無端状のゴム弾性体内で、それの幅方向への延在姿勢とするとともに、前後それぞれの脱輪防止突起の、ゴム弾性体を介した噛み合い状態として、所定のピッチで配設してなるゴムクローラ。   A plurality of the cores for rubber crawler according to claim 1 or 2 are set in an endless rubber elastic body so as to extend in the width direction thereof, and the rubber elasticity of each of the front and rear anti-annulation protrusions A rubber crawler that is arranged at a predetermined pitch as a meshed state through the body.
JP2007247124A 2007-09-25 2007-09-25 Rubber track core and rubber track using the same Active JP5164498B2 (en)

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