JP5358283B2 - Rubber track corer - Google Patents

Rubber track corer Download PDF

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JP5358283B2
JP5358283B2 JP2009117219A JP2009117219A JP5358283B2 JP 5358283 B2 JP5358283 B2 JP 5358283B2 JP 2009117219 A JP2009117219 A JP 2009117219A JP 2009117219 A JP2009117219 A JP 2009117219A JP 5358283 B2 JP5358283 B2 JP 5358283B2
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narrow
crawler
rubber crawler
rubber
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JP2010264850A (en
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修一 松尾
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a core metal for a rubber crawler for obtaining the rubber crawler having low flexural rigidity and durability. <P>SOLUTION: In the core metal for the rubber crawler, a pair of guide projections 12-1, 12-2 have narrow width projection parts 12a-1, 12a-2 projected to one side in a circumferential direction of a crawler body with a narrow interval by predetermined length; and wide width projection parts 12b-1, 12b-2 projected to the other side in the circumferential direction of the crawler body with a wide interval by predetermined length. The narrow width projection parts 12a-1, 12-2 are arranged and buried so as to be inserted to the adjacent wide width projection parts 12b-1, 12b-2 of the core metal by predetermined length. Recesses 30-1, 30-2 are formed at one or both predetermined areas of opposed surfaces of walls of the opposed guide projections 12-1, 12-2 of the wide width projection parts 12b-1, 12b-2 and the narrow width projection parts 12a-1, 12a-2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、ゴムクローラ用芯金、特にクローラ本体の周方向に沿って複数並列して埋設され、該埋設状態におけるクローラ本体の内周面側に一対のガイド突起が突出形成されたゴムクローラ用芯金に関する。   The present invention relates to a core for a rubber crawler, particularly for a rubber crawler in which a plurality of guide protrusions are formed on the inner peripheral surface side of the crawler body in the embedded state. Concerning the mandrel.

内部に芯金を有するゴムクローラは、クローラ本体の周方向に複数の芯金が並べて配置されている。それらの芯金は通常全て同一形状である。芯金には、ゴムクローラ幅方向の略中央部に一対のガイド突起が形成されており、これらのガイド突起の間をスプロケット及びアイドラーが通過する。なお、スプロケット及びアイドラーは、ゴムクローラに駆動力を与えるものである。   A rubber crawler having a cored bar inside has a plurality of cored bars arranged in the circumferential direction of the crawler body. The cores are usually all the same shape. A pair of guide protrusions are formed on the metal core at a substantially central portion in the rubber crawler width direction, and the sprocket and idler pass between these guide protrusions. The sprocket and idler give a driving force to the rubber crawler.

上述のように、一対のガイド突起を有する芯金が埋設されたゴムクローラの例が特許文献１、２に開示されている。図４は、特許文献１、２に記載されているゴムクローラ用芯金に係り、同図（ａ）は概略平面図、同図（ｂ）は概略正面図である。図示のように、ゴムクローラ周方向に、芯金１０が複数並列して配置されており、この各芯金１０−１〜１０−３のゴムクローラ内周面側には、一対のガイド突起１２−１、１２−２がそれぞれ突出形成されている。   As described above, Patent Documents 1 and 2 disclose examples of rubber crawlers in which a core metal having a pair of guide protrusions is embedded. 4A and 4B relate to a rubber crawler mandrel described in Patent Documents 1 and 2, wherein FIG. 4A is a schematic plan view and FIG. 4B is a schematic front view. As shown in the drawing, a plurality of core bars 10 are arranged in parallel in the circumferential direction of the rubber crawler, and a pair of guide protrusions 12 are formed on the inner peripheral surface of each of the core bars 10-1 to 10-3. -1 and 12-2 are formed to protrude.

一対のガイド突起１２−１、１２−２は、中央部２０を挟んで立設されており、ゴムクローラ周方向の前方、後方で互いの間隔が異なるように形成されている。すなわち、一方側が間隔の狭い狭幅突起部１２ａ−１、１２ａ−２と、他方側が間隔の広い広幅通過部１２ｂ−１、１２ｂ−２となっている。これら狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２とは連続部１２ｃ−１、１２ｃ−２を介して繋がっている。   The pair of guide protrusions 12-1 and 12-2 are erected with the central portion 20 interposed therebetween, and are formed such that the distance between them is different between the front and rear in the circumferential direction of the rubber crawler. That is, the narrow protrusions 12a-1 and 12a-2 with a narrow interval on one side and the wide passage portions 12b-1 and 12b-2 with a large interval on the other side. The narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2 are connected via continuous parts 12c-1, 12c-2.

幅広突起部１２ｂ−１、１２ｂ−２及び狭幅突起部１２ａ−１、１２ａ−２は、前述のようにゴムクローラの周方向に突出して形成されており、突出している部分の基端部１２ｄ−１、１２ｄ−２は、図４（ｂ）及び図５に示すように芯金１０の底部２２付近まで延在している。   The wide protrusions 12b-1 and 12b-2 and the narrow protrusions 12a-1 and 12a-2 are formed so as to protrude in the circumferential direction of the rubber crawler as described above, and the base end portion 12d of the protruding portion is formed. -1 and 12d-2 extend to the vicinity of the bottom 22 of the cored bar 10 as shown in FIGS.

また、芯金１０−１と芯金１０−２、及び芯金１０−２と芯金１０−３の間の一方の狭幅突起部１２ａ−１、１２ａ−２は、他方の広幅突起部１２ｂ−１、１２ｂ−２とオーバーラップ領域Ｏで、ゴムクローラ本体の幅方向において重なり合うように構成されている。したがって、オーバーラップ領域Ｏを確保することで狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の係合状態を安定させ、芯金１０がゴムクローラの幅方向にずれること、及び、更に横方向に大きくずれる、いわゆる脱臼の発生の防止を図ることが可能になっている。   Also, one narrow protrusion 12a-1, 12a-2 between the core 10-1 and the core 10-2 and between the core 10-2 and the core 10-3 is the other wide protrusion 12b. -1, 12b-2 and the overlap region O are configured to overlap in the width direction of the rubber crawler body. Therefore, by securing the overlap region O, the engagement state of the narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2 is stabilized, and the cored bar 10 is in the width direction of the rubber crawler. It is possible to prevent the occurrence of so-called dislocation, which shifts to a large distance and further shifts in the lateral direction.

ゴムクローラは、上記のゴムクローラ用芯金１０にゴム部材が被せられて製作される。ゴム部材の被覆は、ゴム原材料を加硫させることにより行われる。上記のオーバーラップ領域Ｏの狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との部分では、芯金１０の底部２２の接地面側にゴム原材料を置いて加流するため、この突起部の間には、ゴム部材が接地面側から内周面側へと入り込むこととなる。すなわち、完成したゴムクローラの狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間にはゴム部材が介在している。   The rubber crawler is manufactured by covering the rubber crawler core 10 with a rubber member. The covering of the rubber member is performed by vulcanizing the rubber raw material. The rubber raw material is placed on the grounding surface side of the bottom portion 22 of the cored bar 10 at the narrow projections 12a-1, 12a-2 and the wide projections 12b-1, 12b-2 in the overlap region O. In order to apply the flow, the rubber member enters the inner peripheral surface side from the grounding surface side between the protrusions. That is, a rubber member is interposed between the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 of the completed rubber crawler.

図５は、上記芯金１０に係る概略側面図であり、同図（ａ）はゴムクローラがスプロケット又はアイドラーに巻掛っていない状態を、同図（ｂ）は巻掛かった状態を示す。ゴムクローラがスプロケット又はアイドラーに巻掛かった場合には、図５（ｂ）に示すように、オーバーラップ領域Ｏが広がってオーバーラップ領域Ｏ’となる。したがって、上述したように狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間にはゴム部材が入り込んでいるので、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の間のゴム部材がせん断変形を起こすため、ゴムクローラの曲げ剛性が高くなる。曲げ剛性が高くなれば、それだけ駆動のためのエネルギを要することとなる。更に、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の間のゴム部材はせん断変形を必然的に繰り返すこととなる。   FIGS. 5A and 5B are schematic side views of the metal core 10. FIG. 5A shows a state where the rubber crawler is not wound on the sprocket or idler, and FIG. 5B shows a state where the rubber crawler is wound. When the rubber crawler is wound around the sprocket or idler, as shown in FIG. 5B, the overlap region O is expanded to become an overlap region O ′. Therefore, as described above, since the rubber member has entered between the narrow projections 12a-1 and 12a-2 and the wide projections 12b-1 and 12b-2, the narrow projections 12a-1 and 12a. -2 and the wide protrusions 12b-1 and 12b-2 cause shear deformation, so that the bending rigidity of the rubber crawler increases. The higher the bending rigidity, the more energy is required for driving. Furthermore, the rubber member between the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 inevitably repeats shear deformation.

なお、クローラ本体のゴム部材の弾性率と、狭幅突起部と広幅突起部の間のゴム部材の弾性率を変えたゴムクローラの構成が、特許文献３に開示されている。この特許文献３によれば、狭幅突起部と広幅突起部との間のゴム部材の弾性率を高めることでゴムクローラの軌道逸脱の危険を減少させることができるとしている。   A configuration of a rubber crawler in which the elastic modulus of the rubber member of the crawler main body and the elastic modulus of the rubber member between the narrow protrusion and the wide protrusion is changed is disclosed in Patent Document 3. According to Patent Document 3, the risk of the rubber crawler deviating from the track can be reduced by increasing the elastic modulus of the rubber member between the narrow protrusion and the wide protrusion.

特開平２−２６７０８４号公報JP-A-2-267084 特開平９−１５０７５９号公報JP-A-9-150759 特開２００８−１２７０１５号公報JP 2008-127015 A

特許文献１、２に開示されているゴムクローラ用芯金を用いて製作されたゴムクローラ及び特許文献３に開示されているゴムクローラは、何れも狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間にゴム部材が入り込んだ構成になっている。したがって、ゴムクローラがスプロケット又はアイドラーに巻掛かったときに、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２とのオーバーラップ領域Ｏが、前述の図５（ｂ）に示すようなオーバーラップ領域Ｏ’となって広がり、その間に入り込んでいるゴム部材がせん断変形を起こしゴムクローラの曲げ剛性が高くなる。その結果、ゴムクローラの駆動に必要なエネルギが増え、燃費が悪いという問題があった。更に、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間に入り込んでいるゴム部材がせん断変形を繰り返すことにより劣化を早め、ゴムクローラの寿命が短いという問題もあった。   The rubber crawler manufactured using the core for rubber crawler disclosed in Patent Documents 1 and 2 and the rubber crawler disclosed in Patent Document 3 are both narrow protrusions 12a-1 and 12a-2. A rubber member is inserted between the wide protrusions 12b-1 and 12b-2. Therefore, when the rubber crawler is wound around the sprocket or idler, the overlap region O between the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 becomes the above-described FIG. The rubber member that expands as an overlap region O ′ as shown in b), and that enters between them, undergoes shear deformation, and the bending rigidity of the rubber crawler increases. As a result, there is a problem that energy required for driving the rubber crawler increases and fuel consumption is poor. Further, the rubber member entering between the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 repeatedly undergoes shear deformation to accelerate deterioration, and the life of the rubber crawler is short. There was also a problem.

本発明は、上記課題に鑑みてなされたものであり、その目的は、曲げ剛性が低く耐久性のあるゴムクローラを実現するためのゴムクローラ用芯金を提供することにある。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a rubber crawler core bar for realizing a rubber crawler having low bending rigidity and durability.

上記目的を達成するため、請求項１に記載のゴムクローラ用芯金は、
無端帯状のクローラ本体に、該クローラ本体の周方向に一定の間隔をおいて埋設され、該埋設状態で前記クローラ本体の幅方向に延在する一対の翼部と、該翼部間に存する中央部と、該中央部の前記幅方向の両脇に設けられ前記埋設状態における前記クローラ本体の内周面側に突出する一対のガイド突起と、を有し、前記一対のガイド突起は、前記クローラ本体の周方向の一方側に狭い間隔で所定長さ突出する狭幅突起部と、前記クローラ本体の周方向の他方側に広い間隔で所定長さ突出する広幅突起部と、を有し、前記狭幅突起部が、隣り合う芯金の前記広幅突起部の間に所定長さ入り込むように配置されて埋設されるゴムクローラ用芯金において、
前記広幅突起部と前記狭幅突起部の対向する壁部の対向面の何れか一方又は双方の所定領域に凹部を設けたことを特徴とする。 In order to achieve the above object, the rubber crawler core metal according to claim 1,
A pair of wings embedded in an endless belt-like crawler body at a constant interval in the circumferential direction of the crawler body and extending in the width direction of the crawler body in the embedded state, and a center existing between the wing parts And a pair of guide projections provided on both sides of the central portion in the width direction and projecting toward the inner peripheral surface side of the crawler main body in the embedded state, the pair of guide projections being the crawler A narrow protrusion projecting a predetermined length at a narrow interval on one side in the circumferential direction of the main body, and a wide protrusion projecting a predetermined length at a wide interval on the other side in the circumferential direction of the crawler body, In the core for a rubber crawler, the narrow protrusion is disposed and embedded so as to enter a predetermined length between the wide protrusions of adjacent cores,
A concave portion is provided in a predetermined region of one or both of the opposing surfaces of the wall portion facing the wide protrusion and the narrow protrusion.

この構成により、ゴムクローラを製作するためにゴム原材料を加硫した場合、芯金の底部から内周面側に流動してくるゴム部材は、狭幅間隔の狭幅突起部と広幅間隔の広幅突起部との間においては、狭幅突起部と広幅突起部の対向面の何れか一方又は双方の所定領域に形成された凹部に溜まり、凹部に溜まることでゴム部材がそれより内周面側へ流動することを抑制することができる。したがって、狭幅突起部と広幅突起部との対向面間の内周面側にはゴム部材が存在しないゴムクローラが製作できる。このようなゴムクローラは、スプロケット又はアイドラーに巻掛かる際の曲げ剛性が小さいので、ゴムクローラの駆動のためのエネルギを低くすることができる。したがって、ゴムクローラを駆動するための燃費は良好である。また、狭幅突起部と広幅突起部との対向面間には、せん断変形を繰り返し行うゴム部材が存在しないのでゴムクローラの耐久性が向上し寿命が長くなる。   With this configuration, when rubber raw materials are vulcanized to produce a rubber crawler, the rubber members that flow from the bottom of the core metal to the inner peripheral surface side are narrow protrusions with a narrow interval and a wide width with a wide interval. Between the protrusions, the rubber member accumulates in a recess formed in a predetermined region of one or both of the opposing surfaces of the narrow protrusion and the wide protrusion, and the rubber member is located on the inner peripheral surface side by collecting in the recess. It can suppress flowing into Therefore, a rubber crawler without a rubber member can be manufactured on the inner peripheral surface side between the opposing surfaces of the narrow protrusion and the wide protrusion. Since such a rubber crawler has a small bending rigidity when wound on a sprocket or idler, energy for driving the rubber crawler can be reduced. Therefore, the fuel consumption for driving the rubber crawler is good. In addition, since there is no rubber member that repeatedly performs shear deformation between the opposing surfaces of the narrow protrusion and the wide protrusion, the durability of the rubber crawler is improved and the life is extended.

請求項２に記載のゴムクローラ用芯金は、請求項１に記載のゴムクローラ用芯金において、
前記凹部は、前記広幅突起部と前記狭幅突起部の対向する壁部の基端部近傍に形成されたことを特徴とする。したがって、広幅突起部と狭幅突起部との対向面間において、芯金の底部から内周面側に向かってくるゴム部材が途中位置で凹部に溜まるので、ゴム部材の存在しない領域をより大きく確保することが可能である。 The rubber crawler metal core according to claim 2 is the rubber crawler metal core according to claim 1,
The concave portion is formed in the vicinity of a base end portion of a wall portion facing the wide protrusion and the narrow protrusion. Accordingly, the rubber member coming from the bottom part of the core metal toward the inner peripheral surface side is accumulated in the recess partway between the opposing surfaces of the wide protrusion part and the narrow protrusion part. It is possible to secure.

請求項３に記載のゴムクローラ用芯金は、請求項１に記載のゴムクローラ用芯金において、
前記凹部は、前記広幅突起部と前記狭幅突起部の対向する壁部の基端部近傍を切り欠いて形成されたことを特徴とする。したがって、大型のゴムクローラ制作時に、芯金の底部から内周面側に向かってくるゴム部材が多くても、流動してくるゴム部材を受け入れて溜める空間を大きく確保することができるので、ゴム部狭幅突起部と広幅突起部との対向面間との間にゴム部材が流入することをより効果的に防止することが可能である。 The rubber crawler metal core according to claim 3 is the rubber crawler metal core according to claim 1,
The concave portion is formed by cutting out the vicinity of the base end portion of the opposing wall portion of the wide protrusion and the narrow protrusion. Therefore, when producing a large rubber crawler, even if there are many rubber members coming from the bottom of the core bar toward the inner peripheral surface side, it is possible to secure a large space for receiving and storing flowing rubber members. It is possible to more effectively prevent the rubber member from flowing between the opposed surfaces of the narrow projection part and the wide projection part.

本発明のゴムクローラ用芯金によれば、狭幅間隔の狭幅突起部と広幅間隔の広幅突起部の対向面の何れか一方又は双方に凹部を形成したので、ゴムクローラ製作時に狭幅突起部と広幅突起部との対向面間にゴム部材が流入することを簡単な構成で効果的に防止することができる。したがって、本発明のゴムクローラ用芯金を用いたゴムクローラは、曲げ剛性が低いので駆動のためのエネルギを低くすることができゴムクローラの低燃費化が達成される。また、繰り返しせん断変形を起こすゴム部材が存在しないのでゴムクローラの耐久性が向上する。   According to the core for a rubber crawler of the present invention, since the concave portion is formed on one or both of the narrow protrusion portions with a narrow interval and the opposing surfaces of the wide protrusion portions with a wide interval, the narrow protrusion is at the time of manufacturing the rubber crawler. It is possible to effectively prevent the rubber member from flowing in between the opposing surfaces of the portion and the wide protrusion with a simple configuration. Accordingly, since the rubber crawler using the core for the rubber crawler of the present invention has low bending rigidity, the energy for driving can be reduced, and the fuel consumption of the rubber crawler can be reduced. Further, since there is no rubber member that repeatedly undergoes shear deformation, the durability of the rubber crawler is improved.

本発明のゴムクローラ用芯金に係り、同図（ａ）は芯金の概略平面図、同（ｂ）は芯金の概略正面図である。FIG. 2A is a schematic plan view of a core metal, and FIG. 2B is a schematic front view of the core metal. 本発明のゴムクローラ用芯金の実施の形態に係り、概略斜視図である。1 is a schematic perspective view according to an embodiment of a core for a rubber crawler of the present invention. 本発明のゴムクローラ用芯金の他の実施の形態に係り、同図（ａ）は芯金の概略正面図、同図（ｂ）は概略斜視図である。FIG. 4A is a schematic front view of a cored bar, and FIG. 2B is a schematic perspective view of another embodiment of the core for a rubber crawler according to the present invention. 従来のゴムクローラ用芯金に係り、同図（ａ）は芯金の概略平面図、同図（ｂ）は概略正面図である。FIG. 4A is a schematic plan view of a metal core, and FIG. 4B is a schematic front view of a conventional rubber crawler metal core. 従来のゴムクローラ用芯金に係り、芯金の概略側面図であって、同図（ａ）はゴムクローラが巻掛かっていない状態、同図（ｂ）はゴムクローラが巻掛かった状態を示す。FIG. 4A is a schematic side view of a metal core for a conventional rubber crawler, in which FIG. 4A shows a state where the rubber crawler is not wound, and FIG. 4B shows a state where the rubber crawler is wound. .

本発明の実施の形態を、以下図面を参照しながら詳述する。図１は、本発明のゴムクローラ用芯金に係り、同図（ａ）は概略平面図、同図（ｂ）は概略正面図である。図２は、図１に示す芯金の概略斜視図である。ゴムクローラ用芯金１０は背景技術で示した従来の芯金と同様に、略中央部に一対のガイド突起１２−１、１２−２を有している。   Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 relates to a rubber crawler mandrel according to the present invention. FIG. 1 (a) is a schematic plan view and FIG. 1 (b) is a schematic front view. FIG. 2 is a schematic perspective view of the cored bar shown in FIG. The rubber crawler metal core 10 has a pair of guide protrusions 12-1 and 12-2 at a substantially central portion, like the conventional metal core shown in the background art.

一対のガイド突起１２−１、１２−２は、中央部２０を挟んで立設されており、ゴムクローラ周方向の前方、後方で互いの間隔が異なるように形成されている。すなわち、一方側が間隔の狭い狭幅突起部１２ａ−１、１２ａ−２と、他方側が間隔の広い広幅通過部１２ｂ−１、１２ｂ−２となっている。これら狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２とは連結部１２ｃ−１、１２ｃ−２により連結されている。   The pair of guide protrusions 12-1 and 12-2 are erected with the central portion 20 interposed therebetween, and are formed such that the distance between them is different between the front and rear in the circumferential direction of the rubber crawler. That is, the narrow protrusions 12a-1 and 12a-2 with a narrow interval on one side and the wide passage portions 12b-1 and 12b-2 with a large interval on the other side. The narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2 are connected by connecting parts 12c-1, 12c-2.

また、芯金１０の狭幅突起部１２ａ−１、１２ａ−２は、隣り合う芯金１０の広幅突起部１２ｂ−１、１２ｂ−２とオーバーラップ領域で、ゴムクローラ本体の幅方向において重なり合うように構成されている。このオーバーラップ領域の存在により、芯金１０のゴムクローラの幅方向へのずれ及び脱臼の防止が図られる。   Further, the narrow protrusions 12a-1 and 12a-2 of the cored bar 10 overlap with the wide protruding parts 12b-1 and 12b-2 of the adjacent cored bar 10 in the overlap direction in the width direction of the rubber crawler body. It is configured. Due to the presence of this overlap region, it is possible to prevent the metal core 10 from shifting and dislocation in the width direction of the rubber crawler.

幅広突起部１２ｂ−１、１２ｂ−２及び狭幅突起部１２ａ−１、１２ａ−２は、ゴムクローラの周方向の前後方向にそれぞれ突出して形成されており、突出している部分の基端部１２ｄ−１、１２ｄ−２は、図１（ｂ）に示すように芯金１０の底部２２付近まで延在している。   The wide protrusions 12b-1 and 12b-2 and the narrow protrusions 12a-1 and 12a-2 are formed to protrude in the front-rear direction in the circumferential direction of the rubber crawler, and the base end 12d of the protruding part -1 and 12d-2 extend to the vicinity of the bottom 22 of the cored bar 10 as shown in FIG.

従来の芯金と異なる点は、図１（ｂ）及び図２の概略斜視図に示すように広幅突起部１２ｂ−１、１２ｂ−２の基端部１２ｄ−１、１２ｄ−２近傍に、凹部３０−１、３０−２が形成されていることにある。この凹部３０−１、３０−２の存在により、ゴム原材料の加硫時に、芯金１０の底部２２から内周面側へ流動して行くゴム部材が、上記の凹部３０−１、３０−２に溜まり、この凹部３０−１、３０−２が形成された内周面側領域にはゴム部材が流動して行かないこととなる。したがって、オーバーラップ領域の狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間にゴム部材が流入することが効果的に防止され、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間にゴム部材が介入しないこととなる。なお、上記凹部３０−１、３０−２を広幅突起部１２ｂ−１、１２ｂ−２の基端部１２ｄ−１、１２ｄ−２近傍に設けたことにより、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間において、ゴム部材が存在しない領域を広く確保することが可能になっている。   The difference from the conventional cored bar is that, as shown in the schematic perspective views of FIG. 1 (b) and FIG. 2, there are recesses in the vicinity of the base ends 12d-1 and 12d-2 of the wide protrusions 12b-1 and 12b-2. 30-1 and 30-2 are formed. Due to the presence of the recesses 30-1 and 30-2, the rubber member that flows from the bottom 22 of the metal core 10 toward the inner peripheral surface side during the vulcanization of the rubber raw material is the recesses 30-1 and 30-2. In other words, the rubber member does not flow into the inner peripheral surface region where the concave portions 30-1 and 30-2 are formed. Accordingly, it is possible to effectively prevent the rubber member from flowing between the opposing surfaces of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 in the overlap region. A rubber member will not intervene between the opposing surfaces of 12a-1, 12a-2 and the wide protrusion parts 12b-1, 12b-2. The concave portions 30-1 and 30-2 are provided in the vicinity of the base end portions 12d-1 and 12d-2 of the wide protrusion portions 12b-1 and 12b-2, so that the narrow protrusion portions 12a-1 and 12a- are provided. 2 and the wide protrusions 12b-1 and 12b-2, it is possible to secure a wide region where no rubber member exists.

このように、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間の内周面側にはゴム部材が存在しないので、本発明の芯金を用いて製作されたゴムクローラは曲げ剛性が低く、ゴムクローラがスプロケット又はアイドラーに巻掛ったときに、従来のようにゴムクローラの曲げ剛性が高くなることはない。   Thus, since there is no rubber member on the inner peripheral surface side between the opposing surfaces of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2, the core bar of the present invention is used. The rubber crawler manufactured using the above has low bending rigidity, and when the rubber crawler is wound around the sprocket or idler, the bending crawler of the rubber crawler does not increase as in the conventional case.

したがって、本発明のゴムクローラ用芯金１０を用いて製作したゴムクローラは、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間の内周面側にゴム部材が存在しないので、ゴムクローラの曲げ剛性を低くすることができ駆動エネルギを低く抑えることが可能である。これにより、ゴムクローラを低燃費で駆動することができる。更に、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間の内周面側にゴム部材が存在しないので、その間に存在するゴム部材のせん断変形による劣化の問題もないため、ゴムクローラの高寿命化が図られる。   Therefore, the rubber crawler manufactured using the core 10 for rubber crawler of the present invention has an inner peripheral surface between the opposing surfaces of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2. Since there is no rubber member on the side, the bending rigidity of the rubber crawler can be lowered and the driving energy can be kept low. Thereby, the rubber crawler can be driven with low fuel consumption. Further, since there is no rubber member on the inner peripheral surface side between the opposing surfaces of the narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2, shear deformation of the rubber member existing therebetween Since there is no problem of deterioration due to, the life of the rubber crawler can be extended.

図３は、本発明のゴムクローラ用芯金に係り、その他の実施の形態を示すものであり、同図（ａ）は概略正面部、同図（ｂ）は概略斜視図である。本実施の形態では、広幅突起部の１２ｂ−１、１２ｂ−２の基端部１２ｄ−１、１２ｄ−２近傍に、切り欠き部３２−１、３２−２が形成された構成になっている。この切り欠き部３２−１、３２−２は、広幅突起部１２ｂ−１、１２ｂ−２に簡単に形成することができる。この切り欠き部３２−１、３２−２の存在により、大型のゴムクローラ制作時に、芯金１０の底部２２から内周面側に向かってくるゴム部材が多くても、流動してくるゴム部材を受け入れて溜める空間を大きく確保することができるので、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との対向面間にゴム部材が流入することをより効果的に防止することが可能である。したがって、本実施の形態のゴムクローラ用芯金１０を用いて製作されたゴムクローラは、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間にはゴム部材が介入していないので、曲げ剛性の低いゴムクローラとなっている。また、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面間にはせん断変形を繰り返すゴム部材存在しないため、ゴムクローラの耐久性が向上する。したがって、本実施の形態のゴムクローラ用芯金１０を用いることで、製作されるゴムクローラの低燃費化と高寿命化が達成できることとなる。   FIGS. 3A and 3B show another embodiment of the rubber crawler core bar of the present invention. FIG. 3A is a schematic front view, and FIG. 3B is a schematic perspective view. In the present embodiment, notch portions 32-1 and 32-2 are formed in the vicinity of the base end portions 12d-1 and 12d-2 of the wide protrusion portions 12b-1 and 12b-2. . The notches 32-1 and 32-2 can be easily formed in the wide protrusions 12b-1 and 12b-2. Due to the presence of the notches 32-1 and 32-2, the rubber member that flows even when there are many rubber members coming from the bottom 22 of the metal core 10 toward the inner peripheral surface when producing a large-sized rubber crawler. It is possible to secure a large space for receiving and storing the rubber member, so that the rubber member flows in between the opposing surfaces of the narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2. It can be effectively prevented. Therefore, the rubber crawler manufactured using the rubber crawler mandrel 10 of the present embodiment is between the opposing surfaces of the narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2. Since no rubber member is intervening, the rubber crawler has low bending rigidity. Further, since there is no rubber member that repeats shear deformation between the opposing surfaces of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2, durability of the rubber crawler is improved. Therefore, by using the rubber crawler mandrel 10 of the present embodiment, it is possible to achieve low fuel consumption and long life of the manufactured rubber crawler.

なお、本発明は、上述の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更が可能である。例えば、狭幅突起部と対向する広幅突起部の面に形成される凹部は長方形状としたが、円形状であっても良い。また、形成される凹部の個数を複数としても良い。   Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the recess formed on the surface of the wide protrusion facing the narrow protrusion is rectangular, but it may be circular. Moreover, it is good also considering the number of the recessed parts formed as plural.

１０ ゴムクローラ用芯金
１２−１、１２−２ ガイド突起
１２ａ−１、１２ａ−２ 狭幅突起部
１２ｂ−１、１２ｂ−２ 広幅突起部
１２ｃ−１、１２ｃ−２ 連続部
１２ｄ−１、１２ｄ−２ 基端部
２０ 中央部
２２ 芯金の底部
３０−１、３０−２ 凹部
３２−１、３２−２ 切り欠き部
Ｏ、Ｏ’ オーバーラップ領域 10 Rubber Crawler Cores 12-1, 12-2 Guide Protrusions 12a-1, 12a-2 Narrow Projection Parts 12b-1, 12b-2 Wide Projection Parts 12c-1, 12c-2 Continuous Parts 12d-1, 12d -2 Base end portion 20 Central portion 22 Core metal bottom portions 30-1, 30-2 Recess portions 32-1, 32-2 Notch portions O, O 'Overlap region

Claims (3)

無端帯状のクローラ本体に、該クローラ本体の周方向に一定の間隔をおいて埋設され、該埋設状態で前記クローラ本体の幅方向に延在する一対の翼部と、該翼部間に存する中央部と、該中央部の前記幅方向の両脇に設けられ前記埋設状態における前記クローラ本体の内周面側に突出する一対のガイド突起と、を有し、
前記一対のガイド突起は、前記クローラ本体の周方向の一方側に狭い間隔で所定長さ突出する狭幅突起部と、前記クローラ本体の周方向の他方側に広い間隔で所定長さ突出する広幅突起部と、を有し、
前記狭幅突起部が、隣り合う芯金の前記広幅突起部の間に所定長さ入り込むように配置されて埋設されるゴムクローラ用芯金において、
前記広幅突起部と前記狭幅突起部の対向する壁部の対向面の何れか一方又は双方の所定領域に凹部を設けたことを特徴とするゴムクローラ用芯金。 A pair of wings embedded in an endless belt-like crawler body at a constant interval in the circumferential direction of the crawler body and extending in the width direction of the crawler body in the embedded state, and a center existing between the wing parts And a pair of guide protrusions that are provided on both sides of the central portion in the width direction and protrude toward the inner peripheral surface side of the crawler body in the embedded state,
The pair of guide protrusions includes a narrow protrusion projecting a predetermined length at one side in the circumferential direction of the crawler body at a narrow interval and a wide width projecting a predetermined length at a wide interval on the other side in the circumferential direction of the crawler body A protrusion, and
In the core for a rubber crawler, the narrow protrusion is disposed and embedded so as to enter a predetermined length between the wide protrusions of adjacent cores,
A rubber crawler core bar, wherein a concave portion is provided in a predetermined region of one or both of opposing surfaces of a wall portion facing the wide projection and the narrow projection. 前記凹部は、
前記広幅突起部と前記狭幅突起部の対向する壁部の基端部近傍に形成されたことを特徴とする請求項１に記載のゴムクローラ用芯金。 The recess is
2. The metal core for a rubber crawler according to claim 1, wherein the core bar is formed in the vicinity of a base end portion of a wall portion where the wide protrusion and the narrow protrusion are opposed to each other. 前記凹部は、
前記広幅突起部と前記狭幅突起部の対向する壁部の基端部近傍を切り欠いて形成されたことを特徴とする請求項１に記載のゴムクローラ用芯金。 The recess is
2. The rubber crawler core bar according to claim 1, wherein the metal core is formed by cutting out the vicinity of a base end portion of a wall portion facing the wide protrusion and the narrow protrusion.
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