JP2010274752A

JP2010274752A - Core bar for rubber crawler

Info

Publication number: JP2010274752A
Application number: JP2009128449A
Authority: JP
Inventors: Shuichi Matsuo; 修一松尾
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2009-05-28
Filing date: 2009-05-28
Publication date: 2010-12-09

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core bar of a rubber crawler for lowering the fuel consumption and prolonging the service life by reducing rigidity when being wrapped around. <P>SOLUTION: In the core bar of the rubber crawler in which a pair of guide projections 12-1, 12-2 includes narrow width projections 12a-1, 12a-2 projecting by a predetermined length at narrow intervals on one side in a circumferential direction of a crawler body and wide width projections 12b-1, 12b-2 projecting by a predetermined length at wide intervals on the other side in the circumferential direction of the crawler body; and the narrow width projections 12a-1, 12a-2 are buried to have an overlap region O where the narrow width projections 12a-1, 12a-2 enters by a predetermined length between the adjacent wide width projections 12b-1, 12b-2 of the core bar, an interval of face surfaces of the narrow width projections 12a-1, 12a-2 and the wide width projections 12b-1, 12b-2 is the narrowest at the approximately center position of the overlap region O and becomes gradually wider toward circumferential distal ends p, q of the narrow width projections and the wide width projections. <P>COPYRIGHT: (C)2011,JPO&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、クローラ本体の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 cored bar at a substantially central portion in the width direction of the crawler body, and a sprocket and an 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３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）は同図（ａ）の要部拡大平面図である。図示のように、クローラ本体の周方向に、芯金１０が複数並列して配置されており、この各芯金１０−１、１０−２のクローラ本体の内周面側には、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. 3A and 3B relate to a rubber crawler mandrel described in Patent Documents 1 and 2, wherein FIG. 3A is a schematic plan view, and FIG. 3B is an enlarged plan view of a main part of FIG. is there. As shown in the figure, a plurality of core bars 10 are arranged in parallel in the circumferential direction of the crawler body, and a pair of guides are provided on the inner peripheral surface side of the crawler body of the core bars 10-1 and 10-2. The protrusions 12-1 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、クローラ本体の周方向の前方、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 crawler body. 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.

また、芯金１０−１と芯金１０−２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、クローラ本体の周方向において重なり合うように構成されている。 Moreover, one narrow protrusion part 12a-1, 12a-2 between the core metal 10-1 and the core metal 10-2 is an overlap area | region O with the other wide protrusion part 12b-1, 12b-2, It is comprised so that it may overlap in the circumferential direction of a crawler main body.

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との部分においては、芯金１０の底部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. At the portions of the narrow projections 12a-1 and 12a-2 and the wide projections 12b-1 and 12b-2 in the overlap region O, a rubber raw material is placed on the bottom grounding surface side of the core metal 10 and added. For this reason, the rubber member enters between the protrusions from the grounding surface side to the inner peripheral surface side. 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.

ここで、上記の狭幅突起部１２ａ−１と広幅突起部１２ｂ−１のオーバーラップ領域Ｏに注目すると、図３（ｂ）に示すように、その対向面の間隔がクローラ本体の周方向に略均一、すなわち狭い間隔で略平行に壁部が対向する領域Ｃが存在する。この領域Ｃにおいては、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間隔は狭くなっており、そこに在るゴム部材の戻り剛性により、脱輪防止の効果が十分に発揮できる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がクローラ本体の横方向にずれること及び所定の係合状態を逸脱する、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。 Here, paying attention to the overlap region O of the narrow protrusion 12a-1 and the wide protrusion 12b-1, the interval between the opposing surfaces is in the circumferential direction of the crawler body as shown in FIG. There is a region C in which the wall portions are substantially uniform, that is, at a narrow interval and substantially in parallel. In this region C, the distance between the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 is narrow, and due to the return rigidity of the rubber member existing there, the wheel is removed. It is comprised so that the effect of prevention can fully be exhibited. Therefore, by securing the overlap region O, the engagement state of the narrow projections 12a-1, 12a-2 and the wide projections 12b-1, 12b-2 is stabilized, and the cored bar 10 is in the lateral direction of the crawler body. It is possible to prevent the occurrence of so-called dislocation that deviates from the predetermined engagement state.

図４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。 4A and 4B are schematic side views of the cored bar 10. FIG. 4A shows a state where the rubber crawler is not wound around the sprocket or idler, and FIG. 4B shows a state where it is wound.

幅広突起部１２ｂ−１、１２ｂ−２及び狭幅突起部１２ａ−１、１２ａ−２は、前述のようにクローラ本体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、１２ｅ−１、１２ｅ−２は、図４（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 circumferential direction of the crawler body as described above, and the base end portion 12d of the protruding portion is formed. -1, 12d-2, 12e-1, and 12e-2 extend to the vicinity of the bottom 22 of the cored bar 10 as shown in FIG.

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４（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、オーバーラップ領域狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間の狭い間隔で略平行に壁部が対向する領域Ｃのゴム部材は、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せん断変形を起こすこととなる。 When the rubber crawler is wound around the sprocket or idler, as shown in FIG. 4B, the overlap region O is expanded to become an overlap region O ′. Accordingly, the rubber member in the region C in which the wall portions face each other in a narrow space between the overlapping region narrow projections 12a-1 and 12a-2 and the wide projections 12b-1 and 12b-2 is rubber. When the crawler is wound around the sprocket or idler, shear deformation occurs.

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に介入するゴム部材の弾性率を変えた構成が、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。 Patent Document 3 discloses a configuration in which the elastic modulus of the rubber member of the crawler body and the elastic modulus of the rubber member intervening between the narrow protrusion and the wide protrusion are changed. 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

図３及び図４に示した特許文献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、上述のように何れも狭幅突起部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。また、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４（ｂ）に示すようにその領域が広がり、オーバーラップ領域Ｏ’となる。したがって、狭い間隔で略平行に壁部が対向する領域Ｃの間に入り込んでいるゴム部材は、高い曲げ剛性でせん断変形を起こすこととなる。その結果、ゴムクローラの駆動に必要なエネルギが増え、燃費が悪くなり、更に、狭い間隔で略平行に壁部が対向する領域Ｃのゴム部材がせん断変形を繰り返すので、劣化が早く、ゴムクローラの寿命が短い等の耐久性の問題もあった。 As described above, the rubber crawler manufactured using the rubber crawler mandrel disclosed in Patent Documents 1 and 2 shown in FIGS. 3 and 4 and the rubber crawler disclosed in Patent Document 3 are both as described above. A rubber member is inserted between the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2. In addition, when the rubber crawler is wound around the sprocket or idler, the overlap region O between the narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2 is shown in FIG. As shown in b), the region widens and becomes an overlap region O ′. Therefore, the rubber member that has entered between the regions C where the wall portions face each other in a substantially parallel manner at a narrow interval causes shear deformation with high bending rigidity. As a result, the energy required for driving the rubber crawler increases, the fuel consumption deteriorates, and the rubber member in the region C where the wall portions face each other in parallel at a narrow interval repeats shear deformation. There was also a problem of durability such as a short lifetime.

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、巻掛かり時における剛性の低減による低燃費化及び長寿命化を図ることのできる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 capable of reducing fuel consumption and extending the life by reducing rigidity during winding. .

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、を有しており、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オーバーラップ領域を有するように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間隔は、前記オーバーラップ領域の略中央位置が最も狭く、前記狭幅突起部及び前記広幅突起部の先端方向のそれぞれに向かって漸次広くなっていることを特徴とする。 In order to achieve the above object, the rubber crawler core metal according to claim 1,
The pair of guides has a pair of guide protrusions embedded in an endless belt-like crawler body at a constant interval in the circumferential direction of the crawler body and protruding toward the inner peripheral surface of the crawler body in the embedded state. The protrusions are narrow protrusions projecting a predetermined length at a narrow interval on one side in the circumferential direction of the crawler body, and wide protrusions protruding a predetermined length on the other side in the circumferential direction of the crawler body; In the rubber crawler core bar embedded so as to have an overlap region in which the narrow protrusion part enters a predetermined length between the wide protrusion parts of adjacent core bars,
The interval between the opposing surfaces of the opposing wall portions of the wide protrusion and the narrow protrusion is the narrowest at the substantially central position of the overlap region, and is in the distal direction of the narrow protrusion and the wide protrusion, respectively. It is characterized by being gradually wider toward the front.

この構成により、狭幅突起部及び広幅突起部の対向する壁部間に在るゴム部材は、狭幅突起部及び広幅突起部が周方向の先端に向かって漸次広くなっている分だけゴム部材の量が多くなっており、狭幅突起部と広幅突起部との対向する壁部間にあるゴム部材は、従来の狭い間隔で略平行に壁部が対向する構成に比べて、曲げ剛性は減少する。したがって、対向する壁部間の最も狭い部分の間隔が上記従来のものと同じ又はより狭い構成であっても、ゴム部材の量を多く確保できることからせん断応力は小さくなり、ゴムクローラがスプロケット又はアイドラーに巻掛かる際の変形に対する耐久性が確保される。また、ゴムクローラが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減少し変形抵抗が小さくなることから、ゴムクローラを駆動するためのエネルギを小さくすることができる。したがって、ゴムクローラの低燃費化及び長寿命化を図ることが可能である。 With this configuration, the rubber member existing between the opposing wall portions of the narrow protrusion and the wide protrusion is a rubber member corresponding to the narrow protrusion and the wide protrusion gradually becoming wider toward the tip in the circumferential direction. The rubber member between the opposing wall portions of the narrow protrusion portion and the wide protrusion portion has a higher bending rigidity than the conventional configuration in which the wall portions oppose each other substantially in parallel with a narrow interval. Decrease. Therefore, even if the distance between the narrowest portions between the opposing wall portions is the same or narrower than that of the conventional one, the amount of the rubber member can be secured, so that the shear stress is reduced, and the rubber crawler becomes a sprocket or idler. Durability against deformation during winding is ensured. Further, since the bending rigidity when the rubber crawler is wound around the sprocket or idler is reduced and the deformation resistance is reduced, the energy for driving the rubber crawler can be reduced. Therefore, it is possible to reduce the fuel consumption and extend the life of the rubber crawler.

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、
前記対向する壁部の間隔は、前記狭幅突起部及び前記広幅突起部の前記オーバーラップ領域の略中央位置から先端側にそれぞれの突起部が先端に向かって細くなるようにアールを設けることによって形成されたことを特徴とする。したがって、狭幅突起部及び広幅突起部の周方向の先端部分に応力が集中することを防止しながら、ゴムクローラの曲げ剛性を低くすることができる。 The rubber crawler metal core according to claim 2 is the rubber crawler metal core according to claim 1,
The interval between the opposing wall portions is formed by providing a radius so that the respective protrusions become narrower toward the tip from the substantially central position of the overlap region of the narrow protrusion and the wide protrusion. It is formed. Therefore, it is possible to reduce the bending rigidity of the rubber crawler while preventing stress from concentrating on the tip portions in the circumferential direction of the narrow protrusion and the wide protrusion.

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、
前記対向する壁部の間隔は、前記狭幅突起部及び前記広幅突起部の前記オーバーラップ領域の略中央位置から先端側にそれぞれの突起部が先端に向かって細くなるようにテーパを設けることによって形成されたことを特徴とする。したがって、簡単な構成で、狭幅突起部及び広幅突起部の周方向の先端部分に応力が集中すること防止しながら、ゴムクローラの曲げ剛性を低くすることができる。 The rubber crawler metal core according to claim 3 is the rubber crawler metal core according to claim 1,
The interval between the opposing wall portions is formed by providing a taper so that the respective protrusions become narrower toward the tip from the substantially central position of the overlap region of the narrow protrusion and the wide protrusion. It is formed. Therefore, with a simple configuration, it is possible to reduce the bending rigidity of the rubber crawler while preventing stress from concentrating on the circumferential tip portions of the narrow and wide protrusions.

本発明のゴムクローラ用芯金によれば、埋設した状態では、広幅突起部と狭幅突起部の対向する壁部の対向面の間隔が、オーバーラップ領域の略中央位置で最も狭く、狭幅突起部及び広幅突起部の先端方向のそれぞれに向かって漸次広くなっている。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、スプロケット又はアイドラーに巻掛かる際に、それらの突起部間に在るゴム部材のせん断応力が小さくなり、曲げ剛性を低くすることができる。その結果、ゴムクローラの低燃費化が達成され、ゴムクローラの耐久性が向上する。したがって、燃費の良好なゴムクローラを長期間に亘り使用することが可能である。 According to the rubber crawler core bar of the present invention, in the embedded state, the interval between the opposing surfaces of the opposing wall portions of the wide protrusion portion and the narrow protrusion portion is the narrowest at the approximate center position of the overlap region, and the The width of the protrusion gradually increases toward the tip of the wide protrusion. Therefore, when the rubber crawler using the core for rubber crawler of the present invention is wound around the sprocket or idler, the shear stress of the rubber member existing between the protrusions becomes small, and the bending rigidity can be lowered. it can. As a result, low fuel consumption of the rubber crawler is achieved, and the durability of the rubber crawler is improved. Therefore, it is possible to use a rubber crawler with good fuel efficiency over a long period of time.

本発明のゴムクローラ用芯金の実施の形態に係り、同図（ａ）は芯金の概略平面図、同（ｂ）は同図（ａ）の要部拡大平面図である。FIG. 4A is a schematic plan view of a cored bar, and FIG. 2B is an enlarged plan view of a main part of FIG. 1A according to an embodiment of a rubber crawler cored bar 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）は芯金の概略平面図、同（ｂ）は同図（ａ）の要部拡大平面図である。FIG. 4A is a schematic plan view of a cored bar, and FIG. 2B is an enlarged plan view of a main part of FIG. 1A according to another embodiment of the rubber crawler cored bar of 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）は同図（ａ）の要部拡大平面図である。FIG. 2A is a schematic plan view of a core metal, and FIG. 1B is an enlarged plan view of a main part of FIG. 1A. 従来のゴムクローラ芯金に係り、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 related to a conventional rubber crawler core. 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）は同図（ａ）の要部拡大平面図である。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. 1A and 1B relate to a rubber crawler mandrel according to the present invention. FIG. 1A is a schematic plan view, and FIG. 1B is an enlarged plan view of a main part of 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.

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Ｏで、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Ｏの存在により、芯金１０のゴムクローラ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 region O in the width direction of the crawler body. It is configured. Due to the presence of the overlap region O, it is possible to prevent the metal core 10 from being displaced and dislocated in the rubber crawler width direction.

従来の芯金と異なる点は、図１（ｂ）の要部拡大平面図に示すように、広幅突起部１２ｂ−１、１２ｂ−２と狭幅突起部１２ａ−１、１２ａ−２とが対向面の間隔にある。すなわち、芯金１０の埋設状態において、上記の間隔はクローラ本体の周方向に略均一ではなく、オーバーラップ領域Ｏの略中央位置で最も狭く、ここから狭幅突起部１２ａ−１、１２ａ−２及び広幅突起部１２ｂ−１、１２ｂ−２の周方向先端部ｐ、ｑに向かって漸次広くなっている。本実施の形態では、対向する壁部の間隔は、狭幅突起部１２ａ−１、１２ａ−２及び広幅突起部１２ｂ−１、１２ｂ−２のオーバーラップ領域Ｏの略中央位置から先端側にそれぞれの突起部が先端に向かって細くなるようにＲ（アール）を設けることによって形成されている。 The difference from the conventional cored bar is that the wide protrusions 12b-1 and 12b-2 and the narrow protrusions 12a-1 and 12a-2 face each other as shown in the enlarged plan view of the main part in FIG. The distance between the faces. That is, in the embedded state of the cored bar 10, the interval is not substantially uniform in the circumferential direction of the crawler body, but is the narrowest at the approximate center position of the overlap region O, and the narrow protrusions 12a-1, 12a-2 from here. And the wide protrusion parts 12b-1 and 12b-2 are gradually widened toward the circumferential front ends p and q. In the present embodiment, the interval between the opposing wall portions is from the substantially central position of the overlap region O of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 to the tip side, respectively. It is formed by providing R (R) so that the projection part of this becomes thin toward the front-end | tip.

具体的には、芯金１０を平面視した場合、広幅突起部１２ｂ−１、１２ｂ−２には、クローラ本体の周方向と平行な直線部１４ｂ−１、１４ｂ−２が存在し、この直線部１４ｂ−１、１４ｂ−２に連続して円弧状に形成されたＲ（アール）状部１６ｂ−１、１６ｂ−２が設けられている。直線部１４ｂ−１とＲ状部１６ｂ−１との接続点ｔ１は、オーバーラップ領域Ｏの略中間であり、また芯金１０−１と隣り合う芯金１０−２との略中間でもある。同様に、狭幅突起部１２ａ−１、１２ａ−２には、クローラ本体の周方向と平行な直線部１４ａ−１、１４ａ−２が存在し、この直線部１４ａ−１、１４ａ−２に連続して円弧状に形成されたＲ状部１６ａ−１、１６ａ−２が設けられている。直線部１４ａ−１とＲ状部１６ａ−との接続点ｔ２は、オーバーラップ領域Ｏの略中間であり、また芯金１０−１と隣り合う芯金１０−２との略中間でもある。 Specifically, when the metal core 10 is viewed in plan, the wide protrusions 12b-1 and 12b-2 have straight portions 14b-1 and 14b-2 that are parallel to the circumferential direction of the crawler body. R (R) -shaped portions 16b-1 and 16b-2 formed in an arc shape are provided continuously to the portions 14b-1 and 14b-2. The connection point t1 between the straight line portion 14b-1 and the R-shaped portion 16b-1 is substantially in the middle of the overlap region O, and is also approximately in the middle between the core metal 10-1 and the adjacent core metal 10-2. Similarly, the narrow protrusions 12a-1 and 12a-2 have linear portions 14a-1 and 14a-2 parallel to the circumferential direction of the crawler body, and are continuous with the linear portions 14a-1 and 14a-2. Thus, R-shaped portions 16a-1 and 16a-2 formed in an arc shape are provided. A connection point t2 between the straight line portion 14a-1 and the R-shaped portion 16a- is substantially in the middle of the overlap region O, and is also substantially in the middle between the core metal 10-1 and the adjacent core metal 10-2.

この構成により、直線部１４ａ−１、１４ｂ−１とＲ状部１６ａ−１、１６ｂ−１との接続部（変曲点）ｔ１、ｔ２間で、狭幅突起部１２ａ−１と広幅突起部１２ｂ−１との間隔が最も狭くなり、この接続点ｔ１、ｔ２から狭幅突起部１２ａ−１及び広幅突起部１２ｂ−１の周方向先端部ｐ、ｑに向かって間隔が広がることとなる。狭幅突起部１２ａ−２と広幅突起部１２ｂ−２に関しても同様である。前述したように背景技術の図３（ｂ）で示したような、狭い間隔で略平行に壁部が対向する領域Ｃは存在しない。 With this configuration, the narrow protrusion 12a-1 and the wide protrusion between the connecting portions (inflection points) t1, t2 between the straight portions 14a-1, 14b-1 and the R-shaped portions 16a-1, 16b-1 The distance to 12b-1 is the narrowest, and the distance widens from the connection points t1 and t2 toward the circumferential tips p and q of the narrow protrusion 12a-1 and the wide protrusion 12b-1. The same applies to the narrow protrusion 12a-2 and the wide protrusion 12b-2. As described above, as shown in FIG. 3B of the background art, there is no region C in which the wall portions are opposed substantially in parallel at a narrow interval.

したがって、狭幅突起器部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間にあるゴム部材は、狭幅突起部１２ａ−１、１２ａ−２及び広幅突起部１２ｂ−１、１２ｂ−２が周方向の先端に向かって漸次広くなっている分だけゴム部材の量が多くなっており、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との対向する壁部間にあるゴム部材は、従来の狭い間隔で略平行に壁部が対向する構成に比べて、曲げ剛性は減少する。したがって、対向する壁部間の最も狭い部分の間隔が上記従来のものと同じ又はより狭い構成であっても、ゴム部材の量を多く確保できることからせん断応力は小さくなり、ゴムクローラがスプロケット又はアイドラーに巻掛かる際の変形に対する耐久性が確保される。また、ゴムクローラが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減少し変形抵抗が小さくなることから、ゴムクローラを駆動するためのエネルギを小さくすることができる。したがって、ゴムクローラの低燃費化及び長寿命化を図ることが可能である。 Therefore, the rubber members between the narrow protrusion portions 12a-1 and 12a-2 and the wide protrusion portions 12b-1 and 12b-2 are the narrow protrusion portions 12a-1 and 12a-2 and the wide protrusion portions 12b. -1, 12b-2 is gradually increased toward the tip in the circumferential direction, the amount of the rubber member is increased, and the narrow protrusions 12a-1, 12a-2 and the wide protrusion 12b-1, The bending rigidity of the rubber member between the wall portions facing 12b-2 is reduced as compared with the conventional configuration in which the wall portions face each other substantially in parallel at a narrow interval. Therefore, even if the distance between the narrowest portions between the opposing wall portions is the same or narrower than that of the conventional one, the amount of the rubber member can be secured, so that the shear stress is reduced, and the rubber crawler becomes a sprocket or idler. Durability against deformation during winding is ensured. Further, since the bending rigidity when the rubber crawler is wound around the sprocket or idler is reduced and the deformation resistance is reduced, the energy for driving the rubber crawler can be reduced. Therefore, it is possible to reduce the fuel consumption and extend the life of the rubber crawler.

また、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の周方向の先端部分がＲ状に形成されているので、応力の集中を防止しながら曲げ剛性を小さくすることが可能である。更に、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面の間隔は、埋設状態において、芯金１０間の略中央部で最小であることから、ゴムクローラの曲げ剛性を低くしながら、クローラ本体の幅方向の剛性を確保し、脱輪防止を効果的に図ることが可能になっている。 In addition, since the distal end portions in the circumferential direction of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 are formed in an R shape, bending rigidity is prevented while preventing stress concentration. It can be made smaller. Furthermore, since the space | interval of the opposing surface of narrow protrusion part 12a-1, 12a-2 and wide protrusion part 12b-1, 12b-2 is the minimum in the approximate center part between the metal cores 10 in an embedded state, While reducing the bending rigidity of the rubber crawler, it is possible to ensure the rigidity in the width direction of the crawler body and effectively prevent the wheel from being removed.

図２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）は概略平面部、同図（ｂ）は同図（ａ）の要部拡大平面図である。本実施の形態では、芯金１０の埋設状態において、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の間隔は、上記の実施の形態と同様に略均一になる領域がなく、狭幅突起部１２ａ−１、１２ａ−２及び広幅突起部１２ｂ−１、１２ｂ−２の周方向先端部ｐ、ｑに向かって漸次広くなっている。本実施の形態では、対向する壁部の間隔は、狭幅突起部１２ａ−１、１２ａ−２及び広幅突起部１２ｂ−１、１２ｂ−２のオーバーラップ領域Ｏの略中央位置から先端側にそれぞれの突起部が先端に向かって細くなるようにテーパを設けることによって形成されている。 FIG. 2 relates to a rubber crawler mandrel according to the present invention and shows another embodiment. FIG. 2 (a) is a schematic plane portion, and FIG. It is an enlarged plan view. In the present embodiment, in the embedded state of the cored bar 10, the intervals between the narrow protrusions 12a-1, 12a-2 and the wide protrusions 12b-1, 12b-2 are substantially uniform as in the above embodiment. There is no region to become, and gradually becomes wider toward the circumferential end portions p and q of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2. In the present embodiment, the interval between the opposing wall portions is from the substantially central position of the overlap region O of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 to the distal end side. The protrusion is formed by providing a taper so that the protrusion becomes thinner toward the tip.

具体的には、芯金１０を平面視した場合、広幅突起部１２ｂ−１、１２ｂ−２には、クローラ本体の周方向と平行な直線部１４ｂ−１、１４ｂ−２が存在し、この直線部１４ｂ−１、１４ｂ−２に連続して形成された第２の直線部１８ｂ−１、１８ｂ−２が設けられている。直線部１４ｂ−１と第２の直線部１８ｂ−１との接続点ｔ３は、オーバーラップ領域Ｏの略中間であり、また芯金１０−１と隣り合う芯金１０−２との略中間でもある。同様に、狭幅突起部１２ａ−１、１２ａ−２には、クローラ本体の周方向と平行な直線部１４ａ−１、１４ａ−２が存在し、この直線部１４ａ−１、１４ａ−２に連続して形成された第２の直線部１８ａ−１、１８ａ−２が設けられている。直線部１４ａ−１と第２の直線部１８ａ−１との接続点ｔ４は、オーバーラップ領域Ｏの略中間であり、また芯金１０−１と隣り合う芯金１０−２との略中間でもある。 Specifically, when the metal core 10 is viewed in plan, the wide protrusions 12b-1 and 12b-2 have straight portions 14b-1 and 14b-2 that are parallel to the circumferential direction of the crawler body. Second linear portions 18b-1 and 18b-2 formed continuously from the portions 14b-1 and 14b-2 are provided. The connection point t3 between the straight line portion 14b-1 and the second straight line portion 18b-1 is approximately in the middle of the overlap region O, and is also approximately in the middle between the core metal 10-1 and the adjacent core metal 10-2. is there. Similarly, the narrow protrusions 12a-1 and 12a-2 have linear portions 14a-1 and 14a-2 parallel to the circumferential direction of the crawler body, and are continuous with the linear portions 14a-1 and 14a-2. Second linear portions 18a-1 and 18a-2 formed in the above manner are provided. The connection point t4 between the straight line portion 14a-1 and the second straight line portion 18a-1 is approximately in the middle of the overlap region O, and is also approximately in the middle between the core metal 10-1 and the adjacent core metal 10-2. is there.

狭幅突起部１２ａ−１、１２ａ−２に係る第２の直線部１８ａ−１、１８ａ−２は、接続点ｔ４（オーバーラップ領域Ｏの略中間）から、上記直線部１４ａ−１、１４ａ−２と所定の角度を為して、クローラ本体の幅方向の中心側へ向かう直線である。広幅突起部１２ｂ−１、１２ｂ−２に係る第２の直線部１８ｂ−１、１８ｂ−２は、接続点ｔ３（オーバーラップ領域Ｏの略中間）から、上記直線部１４ｂ−１、１４ｂ−２と所定の角度を為してクローラ本体の幅方向の外側へ向かう直線である。その他の構成は上述した実施の形態と同様である。 The second straight line portions 18a-1 and 18a-2 related to the narrow protrusion portions 12a-1 and 12a-2 are connected to the straight line portions 14a-1 and 14a- from the connection point t4 (substantially middle of the overlap region O). 2 is a straight line that makes a predetermined angle with 2 and goes toward the center in the width direction of the crawler body. The second straight portions 18b-1 and 18b-2 related to the wide protrusion portions 12b-1 and 12b-2 are connected to the straight portions 14b-1 and 14b-2 from the connection point t3 (substantially middle of the overlap region O). And a straight line extending outward in the width direction of the crawler body at a predetermined angle. Other configurations are the same as those of the above-described embodiment.

この構成により、直線部１４ａ−１、１４ｂ−１と第２の直線部１８ａ−１、１８ｂ−１との接続部（変曲点）ｔ３、ｔ４間で、狭幅突起部１２ａ−１と広幅突起部１２ｂ−１との間隔が最も狭くなり、この接続点ｔ３、ｔ４から狭幅突起部１２ａ−１及び広幅突起部１２ｂ−１の周方向先端部ｐ、ｑに向かって間隔が広がることとなる。狭幅突起部１２ａ−２と広幅突起部１２ｂ−２に関しても同様である。したがって、上記の実施の形態と同様に本実施の形態においても、背景技術の図３（ｂ）で示したような、狭い間隔で略平行に壁部が対向する領域Ｃは存在しない。 With this configuration, the narrow protrusion 12a-1 and the wide width between the connection portions (inflection points) t3 and t4 between the straight portions 14a-1 and 14b-1 and the second straight portions 18a-1 and 18b-1. The distance between the protrusion 12b-1 is the narrowest, and the distance increases from the connection points t3 and t4 toward the distal ends p and q in the circumferential direction of the narrow protrusion 12a-1 and the wide protrusion 12b-1. Become. The same applies to the narrow protrusion 12a-2 and the wide protrusion 12b-2. Therefore, in the present embodiment as well as the above-described embodiment, there is no region C in which the wall portions face each other in parallel at a narrow interval as shown in FIG. 3B of the background art.

したがって、上記の実施の形態と同様に、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との間に存在するゴム部材は、狭幅突起部１２ａ−１２ａ−２及び広幅突起部１２ｂ−１、１２ｂ−２が周方向の先端に向かって漸次広くなっている分だけゴム部材の量が多くなっており、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２との対向する壁部間にあるゴム部材は、従来の狭い間隔で略平行に壁部が対向する構成に比べて、曲げ剛性は減少する。したがって、対向する壁部間の最も狭い部分の間隔が上記従来のものと同じ又はより狭い構成であっても、ゴム部材の量を多く確保できることからせん断応力は小さくなり、ゴムクローラがスプロケット又はアイドラーに巻掛かる際の変形に対する耐久性が確保される。また、ゴムクローラが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減少し変形抵抗が小さくなることから、ゴムクローラを駆動するためのエネルギを小さくすることができる。したがって、ゴムクローラの低燃費化及び長寿命化を図ることが可能である。 Accordingly, as in the above embodiment, the rubber member existing between the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 is the narrow protrusion 12a-12a. -2 and the wide protrusions 12b-1, 12b-2 gradually increase in width toward the tip in the circumferential direction, the amount of the rubber member increases, and the narrow protrusions 12a-1, 12a-2 The rubber member between the wall portions facing the wide protrusions 12b-1 and 12b-2 has a lower bending rigidity than the conventional configuration in which the wall portions face each other substantially in parallel at a narrow interval. Therefore, even if the distance between the narrowest portions between the opposing wall portions is the same or narrower than that of the conventional one, the amount of the rubber member can be secured, so that the shear stress is reduced, and the rubber crawler becomes a sprocket or idler. Durability against deformation during winding is ensured. Further, since the bending rigidity when the rubber crawler is wound around the sprocket or idler is reduced and the deformation resistance is reduced, the energy for driving the rubber crawler can be reduced. Therefore, it is possible to reduce the fuel consumption and extend the life of the rubber crawler.

また、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の周方向の先端部分がテーパ状に形成されているので、応力の集中を受けることがなく、簡単な構成で曲げ剛性を小さくすることが可能である。更に、狭幅突起部１２ａ−１、１２ａ−２と広幅突起部１２ｂ−１、１２ｂ−２の対向面の間隔は、埋設状態において、芯金１０間の略中央部で最小であることから、ゴムクローラの曲げ剛性を低くしながら、ゴムクローラの幅方向の剛性を確保し、脱輪防止を効果的に図ることが可能である。 In addition, since the tip portions in the circumferential direction of the narrow protrusions 12a-1 and 12a-2 and the wide protrusions 12b-1 and 12b-2 are formed in a taper shape, the stress is not concentrated and simple. It is possible to reduce the bending rigidity with a simple configuration. Furthermore, since the space | interval of the opposing surface of narrow protrusion part 12a-1, 12a-2 and wide protrusion part 12b-1, 12b-2 is the minimum in the approximate center part between the metal cores 10 in an embedded state, While reducing the bending rigidity of the rubber crawler, it is possible to ensure the rigidity in the width direction of the rubber crawler and effectively prevent the wheel from being removed.

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、狭幅突起部と広幅突起部は、連続部で繋がっている芯金について示したが、狭幅突起部と広幅突起部が別々の芯金に形成され、一つの芯金においては、狭幅突起部又は広幅突起部がクローラ本体の周方向の前後双方向に突出形成されており、一つの芯金の狭幅突起部又は広幅突起部が隣り合う他の芯金の広幅突起部又は狭幅突起部の間に所定の長さ入り込む構成の芯金にも適用できる。 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 narrow protrusion and the wide protrusion are shown for the core metal connected by the continuous part, but the narrow protrusion and the wide protrusion are formed on separate metal cores. A wide protrusion or a wide protrusion protrudes in both the front and rear directions in the circumferential direction of the crawler body, and a narrow protrusion or a wide protrusion on one core is adjacent to a wide protrusion or a narrow on another core. The present invention can also be applied to a core bar having a predetermined length between the width protrusions.

１０ゴムクローラ用芯金
１４ａ−１、１４ａ−２、１４ｂ−１、１４ｂ−２直線部
１６ａ−１、１６ａ−２、１６ｂ−１、１６ｂ−２Ｒ（アール）状部
１８ａ−１、１８ａ−２、１８ｂ−１、１８ｂ−２第２の直線部
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
Ｏ、Ｏ’ オーバーラップ領域
Ｃ略平行に壁部が対向する領域
ｐ、ｑ突起部の周方向先端部
ｔ１、ｔ２、ｔ３、ｔ４接続点（変曲点） 10 Rubber Crawler Cores 14a-1, 14a-2, 14b-1, 14b-2 Straight Lines 16a-1, 16a-2, 16b-1, 16b-2 R (R) -Shaped Parts 18a-1, 18a- 2, 18b-1, 18b-2 Second linear portions 12-1, 12-2 Guide protrusions 12a-1, 12a-2 Narrow protrusions 12b-1, 12b-2 Wide protrusions 12c-1, 12c- 2 Continuous portion O, O ′ Overlap region C Regions p, q where the wall portions are substantially parallel to each other.

Claims

An endless belt-like crawler body having a pair of guide protrusions embedded in the circumferential direction of the crawler body at a constant interval and protruding toward the inner peripheral surface of the crawler body in the embedded state;
The pair of guide protrusions includes a narrow protrusion projecting a predetermined length at a narrow interval on one side in the circumferential direction of the crawler 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. A protrusion, and
In the core for a rubber crawler embedded so that the narrow protrusion has an overlap region that enters a predetermined length between the wide protrusions of adjacent cores,
The interval between the opposing surfaces of the opposing wall portions of the wide protrusion and the narrow protrusion is:
A rubber crawler core bar characterized in that the substantially central position of the overlap region is the narrowest and gradually widens in the distal direction of the narrow protrusion and the wide protrusion.

The interval between the opposing wall portions is
The narrow protrusion and the wide protrusion are formed by providing a radius from the substantially central position of the overlap region to the front end side so that the respective protrusions become narrower toward the front end. Item 2. A rubber crawler core metal according to Item 1.

The interval between the opposing wall portions is
The narrow protrusion and the wide protrusion are formed by providing a taper from the substantially central position of the overlap region to the front end side so that the respective protrusions become narrower toward the front end. Item 2. A rubber crawler core metal according to Item 1.