JP4732907B2 - Rubber crawler - Google Patents

Rubber crawler Download PDF

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Publication number
JP4732907B2
JP4732907B2 JP2006017912A JP2006017912A JP4732907B2 JP 4732907 B2 JP4732907 B2 JP 4732907B2 JP 2006017912 A JP2006017912 A JP 2006017912A JP 2006017912 A JP2006017912 A JP 2006017912A JP 4732907 B2 JP4732907 B2 JP 4732907B2
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Prior art keywords
rubber
lug
steel cord
elastic band
crawler
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JP2006256602A (en
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義彦 小野
靖夫 下薗
大介 萩尾
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Bridgestone Corp
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Bridgestone Corp
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Priority to JP2006017912A priority Critical patent/JP4732907B2/en
Priority to KR1020060014877A priority patent/KR101242283B1/en
Priority to CN2006100078251A priority patent/CN1821000B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
    • B62D55/244—Moulded in one piece, with either smooth surfaces or surfaces having projections, e.g. incorporating reinforcing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
    • B62D55/253—Tracks of continuously flexible type, e.g. rubber belts having elements interconnected by one or more cables or like elements

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Belt Conveyors (AREA)

Description

本発明はゴムクロ−ラ中に埋設されるスチ−ルコ−ドのエンドレス部の改良に関するものである。   The present invention relates to an improvement in the endless portion of a steel cord embedded in a rubber track.

ゴムクロ−ラはその内部に引っ張り補強部材としてのスチ−ルコ−ドがその長手方向に埋設されている。そして、通常は有端のゴム弾性帯を成形し、両端より突出させたスチ−ルコ−ド端部を重ね合わせ、この部位の未加硫ゴムを加熱・加硫してエンドレス部を構成している。このスチ−ルコ−ドの重ね合わせ端部は、ゴムクロ−ラが走行に供された場合にはゴムクロ−ラ走行装置に備えられたアイドラ−、スプロケットに巻き掛けられることにより引張りの力が発生する。このため、スチ−ルコ−ドの端部は外周側に形成されたゴムラグ直下（平面視でゴムラグの領域内）に埋め込まれるのが通例である。   In the rubber crawler, a steel cord as a tensile reinforcing member is embedded in the longitudinal direction. Usually, a rubber elastic band with ends is molded, and the steel cord ends protruding from both ends are overlapped, and the unvulcanized rubber at this part is heated and vulcanized to form an endless portion. Yes. When the rubber crawler is used for traveling, the overlapping end portion of the steel cord is wound around an idler and a sprocket provided in the rubber crawler traveling device to generate a tensile force. . For this reason, the end portion of the steel cord is usually embedded directly under the rubber lug formed on the outer peripheral side (in the region of the rubber lug in plan view).

図１はかかるエンドレス部の概念図を示すものであり、１はゴム弾性帯、２はこのゴム弾性帯の長手方向に埋設されたスチ−ルコ−ドである。１は有端状に形成されたものであり、その端部より突出したスチ−ルコ−ド端部２ａ、２ｂを重ね合わせ、この部位に新たな未加硫ゴムを充填し、或いはこの部位のゴムを半加硫状態としておいてこれを重ね合わせ、その後、これら未加硫ゴム或は半加硫状態のゴムを加熱して全体として加硫一体化してゴムクロ−ラを得るものである。図中、３は外周側に形成されたゴムラグであり、通常は図示するようにスチ−ルコ−ド端部２ａ、２ｂはゴムラグ３の直下（ゴムラグの領域内）に配置されるものである。   FIG. 1 shows a conceptual diagram of such an endless portion, wherein 1 is a rubber elastic band and 2 is a steel cord embedded in the longitudinal direction of this rubber elastic band. 1 is formed in an end shape, and the steel cord end portions 2a and 2b protruding from the end portions are overlapped, and this portion is filled with new unvulcanized rubber, or The rubber is put in a semi-vulcanized state and superposed, and then the unvulcanized rubber or semi-vulcanized rubber is heated and vulcanized and integrated as a whole to obtain a rubber track. In the figure, reference numeral 3 denotes a rubber lug formed on the outer peripheral side. Normally, the steel cord end portions 2a and 2b are arranged immediately below the rubber lug 3 (in the region of the rubber lug) as shown in the figure.

従って、重ね合わされたスチ−ルコ−ド２の外周側に配置された端部２ａは、ゴムクロ−ラがアイドラ−やスプロケットに巻き掛けされて走行に供された際に、スチ−ルコ−ド端部２ａはスチ−ルコ−ド端部２ｂの方向に向けて引っ張られる力が常に働き、特にそのゴムの歪みが大きいゴムラグ３ａの基部３ａ０部にクラックが入りやすいという現象があった。   Therefore, the end portion 2a arranged on the outer peripheral side of the superposed steel cord 2 has a steel cord end when the rubber crawler is wound around an idler or a sprocket and used for traveling. The portion 2a is always subjected to a pulling force toward the steel cord end portion 2b, and there is a phenomenon that cracks are likely to occur in the base portion 3a0 of the rubber lug 3a, which has a large rubber distortion.

本発明はスチ−ルコ−ドが重ね合わされた際のかかるクラックの発生を低減し、ゴムクロ−ラの寿命を向上させることを目的とするものである。   An object of the present invention is to reduce the occurrence of such cracks when steel codes are overlaid and to improve the life of a rubber crawler.

本発明の第１（請求項１）の要旨は、有端のゴム弾性帯と、このゴム弾性帯中にその長手方向に沿って埋設され、両端部が該ゴム弾性帯より突出したスチ−ルコードとからなり、突出したスチールコード端部を重ね合わせ、該部位における未加硫ゴムを加硫してエンドレス状にしたゴムクローラであって、ゴムクローラの外周側に重ね合わせられたスチールコード端部に対し、その最も近い位置にあるゴムラグの基部の表面を含む領域を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成し、前記ゴムラグの基部の表面を含む領域は、隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域であることを特徴とするものである。 The gist of the first (claim 1) of the present invention is that a rubber elastic band with ends and a steel cord embedded in the rubber elastic band along the longitudinal direction thereof and projecting at both ends from the rubber elastic band. A rubber crawler in which the protruding steel cord ends are overlapped and the unvulcanized rubber in the portion is vulcanized into an endless shape, and the steel cord ends overlapped on the outer peripheral side of the rubber crawler On the other hand, the region including the surface of the base portion of the rubber lug at the closest position is constituted by a rubber member having a larger elongation characteristic than the rubber constituting the rubber lug and the rubber elastic band, and the region including the surface of the base portion of the rubber lug is The region includes the rubber lug surface excluding both top surfaces of the adjacent rubber lugs and the outer surface of the rubber crawler .

本発明の第２（請求項２）の要旨は、有端のゴム弾性帯と、このゴム弾性帯中にその長手方向に沿って埋設され、両端部が該ゴム弾性帯より突出したスチ−ルコードとからなり、突出したスチールコード端部を重ね合わせ、該部位における未加硫ゴムを加硫してエンドレス状にしたゴムクローラであって、ゴムクローラの外周側に重ね合わせられたスチールコード端部が、平面視でゴムラグ領域内に配置され、外周側スチールコードの長手方向の端部より長手方向外側で、最も近い位置にあるゴムラグの基部の表面を含む領域を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成し、前記ゴムラグの基部の表面を含む領域は、隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域であることを特徴とするものである。 Summary of the second (claim 2) of the present invention, the rubber elastic strip having ends are embedded along the longitudinal direction during the rubber elastic strip, steel end portions protruding from the rubber elastic strip - Rukodo A rubber crawler in which the protruding steel cord ends are overlapped and the unvulcanized rubber in the portion is vulcanized into an endless shape, and the steel cord ends overlapped on the outer peripheral side of the rubber crawler Is arranged in the rubber lug region in plan view, and the region including the surface of the base portion of the rubber lug closest to the outer side in the longitudinal direction from the longitudinal end of the outer peripheral side steel cord constitutes the rubber lug and the rubber elastic band territory constitutes a large rubber member elongation properties than rubber, the region including the surface of the base portion of the Gomuragu may include a surface and a rubber crawler outer peripheral surface of the Gomuragu excluding the both top surfaces of adjacent Gomuragu to It is characterized in that it.

本発明の第３（請求項３）の要旨は、有端のゴム弾性帯と、このゴム弾性帯中にその長手方向に沿って埋設され、両端部が該ゴム弾性帯より突出したスチールコードとからなり、突出したスチールコード端部を重ね合わせ、該部位における未加硫ゴムを加硫してエンドレス状にしたゴムクローラであって、ゴムクローラの外周側に重ね合わせられたスチールコード端部が、平面視でゴムラグ間に配置され、外周側スチールコードの長手方向の端部より長手方向外側で、最も近い位置にあるゴムラグの基部の表面を含む領域を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成し、前記ゴムラグの基部の表面を含む領域は、隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域であることを特徴とするものである。 The gist of the third (claim 3) of the present invention is that a rubber elastic band with ends and a steel cord embedded in the rubber elastic band along the longitudinal direction thereof and projecting at both ends from the rubber elastic band, A rubber crawler in which the protruding steel cord ends are overlapped and the unvulcanized rubber in the portion is vulcanized into an endless shape, and the steel cord ends overlapped on the outer peripheral side of the rubber crawler are , disposed between Gomuragu in plan view, in the longitudinal direction outward from the longitudinal end portion of the outer peripheral side steel cord, the region including the surface of the base of Gomuragu positioned closest, rubber constituting the Gomuragu and rubber elastic strip constitute a large rubber member elongation properties than the region including the surface of the base portion of the Gomuragu is a region including the surface and the rubber crawler outer peripheral surface of the Gomuragu excluding the both top surfaces of adjacent Gomuragu It is characterized in that that.

本発明にあって、引張りの力が発生するゴムクローラの外周側に重ね合わせられたスチールコード端部に対し、その最も近い位置にあるゴムラグの基部の表面を含む領域（隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域）を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成するものであり、このためにゴムラグ基部の耐クラック性が改善されることとなったものである。 In the present invention, an area including the surface of the base portion of the rubber lug closest to the end portion of the steel cord superimposed on the outer peripheral side of the rubber crawler where a tensile force is generated (both peaks of adjacent rubber lugs) The surface of the rubber lug excluding the surface and the area including the outer peripheral surface of the rubber crawler) is made of a rubber member having a larger elongation characteristic than the rubber constituting the rubber lug and the rubber elastic band. This is the improvement of sex.

好ましい例を具体的に述べれば、ゴムクローラの外周側に重ね合わせられたスチールコード端部に対し、平面視でゴムラグの領域内に配置され、或いはゴムラグ間に配置されることとなるが、当該スチールコード端部より長手方向外側で、最も近い位置にあるゴムラグの基部の表面を含む領域（隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域）を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成したものであり、これによってかかるゴムラグ基部の耐クラック性が改善されることとなったものである。 More specifically, a steel cord end portion superimposed on the outer peripheral side of the rubber crawler is disposed in the rubber lug region in a plan view or disposed between the rubber lugs. A region including the surface of the base portion of the rubber lug closest to the outer side in the longitudinal direction from the end portion of the steel cord (the surface of the rubber lug excluding both top surfaces of adjacent rubber lugs and the region including the outer surface of the rubber crawler) , the rubber lug and The rubber elastic band is composed of a rubber member having a larger elongation characteristic than the rubber constituting the rubber elastic band, whereby the crack resistance of the rubber lug base is improved.

本発明の第２（請求項２）を例にとって説明すれば、前記した図１のエンドレス部にあって、外周側に重ね合わされるスチ−ルコ−ド端部はゴムラグ３ａの直下（即ち、平面視でゴムラグの領域内）になるように配置される。この時、走行中のゴムに対する歪みはゴムラグ３ａの基部３ａ０に集中する。本発明はかかる部位に耐クラック性の伸びのあるゴムシ−トを埋設するものであり、通常はゴムラグ３ａと次の位置にあるゴムラグ３の間をかかるシ−トにて覆って一体化するものである。尚、主としてクラックが生じることが予想されるゴムラグ３ａの基部（３ａ０）のみにこのゴムシ−トを適用できることは言うまでもない。   The second (claim 2) of the present invention will be described as an example. In the endless portion of FIG. 1 described above, the steel cord end portion superimposed on the outer peripheral side is directly below the rubber lug 3a (that is, a plane surface). It is arranged so as to be in the rubber lug area). At this time, distortion with respect to the running rubber is concentrated on the base 3a0 of the rubber lug 3a. The present invention embeds a rubber sheet with crack-resistant elongation at such a site, and usually covers and integrates the rubber lug 3a and the rubber lug 3 at the next position with such a sheet. It is. Needless to say, this rubber sheet can be applied only to the base (3a0) of the rubber lug 3a where cracks are expected to occur.

尚、スチ−ルコ−ド端部２ａの配置位置によってはゴムラグ３ａの基部３ａ０と反対側の基部３ａ１にも影響があることが懸念されるが、この場合には本発明の第１（請求項１）に記載したように、最も近い位置にあるゴムラグの基部の表面を含む領域、即ち、ゴムラグ３ａの基部３ａ１側に前記のゴムシ−トが適用できることは言うまでもない。 Note that depending on the arrangement position of the steel cord end 2a, there is a concern that the base 3a1 opposite to the base 3a0 of the rubber lug 3a may be affected. In this case, the first aspect of the present invention (claims) As described in 1), it goes without saying that the rubber sheet can be applied to the region including the surface of the base portion of the rubber lug at the nearest position, that is, the base portion 3a1 side of the rubber lug 3a.

前記ゴムラグの基部の表面を構成するゴム部材（ゴムシ−ト）は、ゴム硬度（ＪＩＳ・Ａ）が６０度以下であるのがよく、通常はゴムラグの硬度及びゴムクロ−ラ本体のゴムより硬度の小さいものが好ましい。更に言えば、このゴム部材はゴムラグとの接着性及び屈曲疲労性を考慮してＮＲ（天然ゴム）を主成分とするゴムが好ましく、引張り破断伸びＥｂは６００％以上、引張り破断強度Ｔｂは２０ＭＰａ以上であるのが良い。   The rubber member (rubber sheet) constituting the surface of the base portion of the rubber lug should have a rubber hardness (JIS A) of 60 degrees or less, and usually the hardness of the rubber lug and the rubber of the rubber crawler body. Small ones are preferred. More specifically, this rubber member is preferably a rubber mainly composed of NR (natural rubber) in consideration of adhesion to rubber lugs and bending fatigue, and has a tensile breaking elongation Eb of 600% or more and a tensile breaking strength Tb of 20 MPa. That is good.

尚、かかるゴム部材が適用される部位、即ち、前記ゴムラグの基部を含む領域とは、隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクロ−ラ外周面を含む領域を言うものである。   The portion to which such a rubber member is applied, that is, the region including the base portion of the rubber lug refers to a region including the surface of the rubber lug and the outer surface of the rubber crawler excluding both top surfaces of adjacent rubber lugs. .

このゴム部材（ゴムシート）の厚さは、引張り破断伸び、及び引張り強度の観点から見て２ｍｍ以上で５ｍｍ以下であることが求められる。２ｍｍ未満では、万一クラックが生した場合のクラック成長の防止に十分な厚さでなく、製造上の観点からするとゴムの圧延作業性に問題が生ずるからである。一方、５ｍｍより厚くなると、ゴムラグに使用されるゴム領域がその分だけ減少することとなり、ゴムラグの耐摩耗性が低下して、走行に供された場合不都合が生じることがある。   The thickness of the rubber member (rubber sheet) is required to be 2 mm or more and 5 mm or less from the viewpoint of tensile elongation at break and tensile strength. If the thickness is less than 2 mm, the thickness is not sufficient to prevent crack growth in the event of a crack, and a problem arises in rubber rolling workability from the viewpoint of manufacturing. On the other hand, if it is thicker than 5 mm, the rubber area used for the rubber lug will be reduced by that amount, and the wear resistance of the rubber lug will be reduced, which may cause inconvenience when used for running.

このゴムシ−トはゴムクロ−ラのモ−ルド内にかかるゴムシ−トを貼り付けておき、ゴムクロ−ラの基体をなす弾性体と一体として加硫されることになる。勿論、エンドレス作業時にこれを加硫することも可能である。   This rubber sheet is vulcanized as an integral part of the elastic body forming the base of the rubber crawler by attaching the rubber sheet in the mold of the rubber crawler. Of course, it is also possible to vulcanize this during endless work.

尚、図１はゴムラグの直下にスチ−ルコ−ド端部が配置された例であるが、勿論、そのほかの場合であっても本発明の効果は十分もたらされるもので、例えばスチ−ルコ−ド端部がゴムラグ３ａと３ｂの間にある場合でもその効果は十分にもたらされる。   FIG. 1 shows an example in which the end of the steel cord is arranged directly under the rubber lug. Of course, the effect of the present invention can be sufficiently obtained even in other cases. Even when the end of the door is between the rubber lugs 3a and 3b, the effect is sufficiently obtained.

以下、本発明を図面をもって更に詳細に説明する。図２において、１１は有端のゴム弾性帯、１２はその長手方向に埋設されたスチ−ルコ−ドであり、ゴム弾性帯１１の両端より両端部１２ａ、１２ｂが突出している。勿論、ゴム弾性帯１１はモ−ルド２１、２２内にスチ−ルコ−ド１２を張り、ここに未加硫ゴム１４を充填し、加熱してゴム弾性体１１が形成される。このゴム弾性帯１１の外周にはゴムラグ１３が一定ピッチをもって形成されている。   Hereinafter, the present invention will be described in more detail with reference to the drawings. In FIG. 2, 11 is a rubber elastic band with ends, 12 is a steel cord embedded in the longitudinal direction, and both end portions 12 a and 12 b protrude from both ends of the rubber elastic band 11. Of course, the rubber elastic band 11 has a steel cord 12 in the molds 21 and 22, filled with unvulcanized rubber 14, and heated to form the rubber elastic body 11. Rubber lugs 13 are formed on the outer periphery of the rubber elastic band 11 with a constant pitch.

さて、上図はこの未加硫ゴム１４を充填した際のモ−ルド２１、２２内を示す図であるが、スチ−ルコ−ド１２の外周側に位置するスチ−ルコ−ド端部１２ａがゴムラグ１３ａの直下（平面視でゴムラグの領域内）に配置されている。そして、この配置では外周側スチ−ルコ−ドの長手方向の端部より外側で、最も近い位置にあるゴムラグの基部１３ａ０を含む領域、即ちゴムラグ１３ａのラグ頂面１３ｃ、１３ｄを除くゴムラグの表面及びゴムクロ−ラ外周面４１を含む領域に厚さ３ｍｍのゴムシ−ト３１を貼り付け、これをゴム弾性帯１１或いは充填した未加硫ゴムと一体としたものである。ゴムシ−ト３１はゴム硬度５３度（ＪＩＳ・Ａ）のものである。尚、ゴム弾性帯１１の内周面側はゴム硬度が６８度であり、外周側のゴムラグ１３のゴム硬度は６２度である。尚、各ゴム部材の配合を以下の表１に示す。   The above figure is a diagram showing the inside of the molds 21 and 22 when the unvulcanized rubber 14 is filled. The steel cord end portion 12a located on the outer peripheral side of the steel cord 12 is shown. Is disposed directly below the rubber lug 13a (in the rubber lug region in plan view). In this arrangement, the rubber lug surface excluding the lug top surfaces 13c and 13d of the rubber lug 13a, that is, the region including the base portion 13a0 of the rubber lug closest to the outer end of the outer steel cord in the longitudinal direction. In addition, a rubber sheet 31 having a thickness of 3 mm is attached to a region including the outer surface 41 of the rubber crawler, and this is integrated with the rubber elastic band 11 or filled unvulcanized rubber. The rubber sheet 31 has a rubber hardness of 53 degrees (JIS A). The rubber elastic band 11 has a rubber hardness of 68 degrees on the inner peripheral surface side and a rubber lug 13 on the outer peripheral side of 62 degrees. The composition of each rubber member is shown in Table 1 below.

Figure 0004732907
Figure 0004732907

かかるエンドレス構造をもつゴムクロ−ラが走行に供された場合、従来のものにあっては、硬度が高く、柔軟性が少ないゴムラグ１３ａの基部１３ａ０及びゴムラグの頂面１３ｃを除くゴムラグ１３ａの表面付近に歪みが集中するが、本発明の構造にあっては、ゴムラグ１３ａの基部１３ａ０を含む領域が硬度が低く、比較的柔軟性が大きいゴム部（ゴムシ−ト３１を添着）としたために歪みの集中は少なく、クラックの発生が著しく低減できたものである。   When a rubber crawler having such an endless structure is used for traveling, in the conventional one, the vicinity of the surface of the rubber lug 13a excluding the base portion 13a0 of the rubber lug 13a and the top surface 13c of the rubber lug having high hardness and low flexibility. However, in the structure of the present invention, since the region including the base portion 13a0 of the rubber lug 13a has a low hardness and a relatively flexible rubber portion (attached to the rubber sheet 31), the strain is not reduced. Concentration is small and the occurrence of cracks can be remarkably reduced.

図３はこの未加硫ゴム１４を充填した際のモ−ルド２１、２２内を示す別例の図であり、スチ−ルコ−ド１２の外周側に位置するスチ−ルコ−ド端部１２ａがゴムクロ−ラ外周面４１に対応して配置されている。即ち、スチ−ルコ−ド端部１２ａはゴムラグ１３ａ、１３ｂ間に配置されているものである。   FIG. 3 is a view of another example showing the inside of the molds 21 and 22 when the unvulcanized rubber 14 is filled. The steel cord end portion 12a located on the outer peripheral side of the steel cord 12 is shown. Are arranged corresponding to the outer peripheral surface 41 of the rubber track. That is, the steel cord end 12a is disposed between the rubber lugs 13a and 13b.

この配置ではゴムラグ１３ｂの基部１３ｂ０及び肉厚の薄いゴムクロ−ラ外表面４１にクラックが入りやすくなるところ、外周側スチールコード１２ａの長手方向の端部より外側で、最も近い位置にあるゴムラグの基部１３ａ０の表面を含む領域、即ち、図示の隣り合うゴムラグ１３ａ、１３ｂの両ゴムラグ頂面１３ｃ、１３ｄを除く表面とゴムクローラ外周面４１を含む領域に厚さ３ｍｍのゴムシート３１を貼り付け、これをゴム弾性帯１１或いは充填した未加硫ゴム１４と一体としたものである。ゴムシート３１のゴム硬度、ゴム弾性帯１１の内周側のゴム硬度、外周側のゴムラグ１３のゴム硬度は図２に示したゴムクローラに使用されたものと同一であり、ここでは省略する。尚、ゴムラグ１３ａにあって、基部１３ａ１側にもゴムシ−トが適用できることは既に述べた通りである。   In this arrangement, the base 13b0 of the rubber lug 13b and the thin rubber crawler outer surface 41 are prone to crack, but the base of the rubber lug closest to the outer side of the longitudinal end of the outer steel cord 12a. A rubber sheet 31 having a thickness of 3 mm is attached to a region including the surface of 13a0, that is, a region excluding both rubber lug top surfaces 13c and 13d of the adjacent rubber lugs 13a and 13b and a region including the outer surface 41 of the rubber crawler. Is integrated with the rubber elastic band 11 or the filled unvulcanized rubber 14. The rubber hardness of the rubber sheet 31, the rubber hardness on the inner peripheral side of the rubber elastic band 11, and the rubber hardness of the rubber lug 13 on the outer peripheral side are the same as those used in the rubber crawler shown in FIG. As already described, the rubber sheet can be applied to the base 13a1 side of the rubber lug 13a.

（台上屈曲耐久試験）
次に、図２に示したゴムクローラを用いた屈曲耐久試験の結果について説明する。用いたゴムクロ−ラは、ゴムクローラ幅４００ｍｍ、芯金数４２本、芯金ピッチ長９０ｍｍに成形したものであり、これをスプロケット径φ１７５ｍｍ、スプロケット歯数７本、スプロケット歯ピッチ９０ｍｍを有する耐久試験機に組み込んだ。 (Bend bending durability test)
Next, the results of a bending durability test using the rubber crawler shown in FIG. 2 will be described. The rubber crawler used was molded into a rubber crawler width of 400 mm, a cored bar number of 42, and a cored bar pitch length of 90 mm. This durability test had a sprocket diameter of 175 mm, a sprocket tooth count of 7 and a sprocket tooth pitch of 90 mm. Built into the machine.

そして、スプロケット回転数を１２５ｒｐｍ（実機走行速度、４．７ｋｍに相当）で回転させ、ゴムクローラにクラックが発生するまで回転数を測定した。改善目標は１００万回の回転でもクラックの発生を見ないように設定した。一方、比較例としては、図１に示したゴムシート３１を貼り付けていない従来のゴムクローラを用いた。試験回数は２回行った。   Then, the rotation speed of the sprocket was rotated at 125 rpm (corresponding to an actual machine traveling speed of 4.7 km), and the rotation speed was measured until a crack occurred on the rubber crawler. The improvement target was set so that cracks would not be seen even after 1 million rotations. On the other hand, as a comparative example, a conventional rubber crawler not attached with the rubber sheet 31 shown in FIG. 1 was used. The test was performed twice.

この結果、比較例のゴムクロ−ラはいずれも回転数が約２０万回にてクラックが発生した。一方、本発明のゴムクロ−ラは、いずれの試験も目標をクリアする結果となり、クラックの発生を見たのは回転数が１１０〜１５０万回を越えた際に発生した。このように、本発明にあっては十分な屈曲耐久性を有することが判明した。   As a result, the rubber crawlers of the comparative examples all cracked at a rotational speed of about 200,000 times. On the other hand, the rubber crawler of the present invention cleared the target in all tests, and the occurrence of cracks occurred when the rotation speed exceeded 110 to 1.5 million times. Thus, it has been found that the present invention has sufficient bending durability.

（実機による屈曲耐久試験）
次に、上記の実施例及び比較例と同様のゴムクローラを夫々量２．５トンのコンバインに組み込んで泥土上にて走行させ、このとき発生するクラック延伸長さを走行時間毎に測定した。結果を図４に示した。これによれば、比較例のゴムクローラにおいては、走行時間２５０時間辺りからゴムクローラの外表面にクラックが生し始め、その後急激にクラック延伸長さが増加した。これに対して、実施例のゴムクローラにおいては、５００時間を適えてもクラックの発生は起こらず、その後のクラック延伸長さも５０ｍｍを超えることは無かった。 (Bending durability test with actual machine)
Next, rubber crawlers similar to those in the above examples and comparative examples were each incorporated into a 2.5 ton combine and run on mud, and the crack extension length generated at this time was measured for each running time. The results are shown in FIG. According to this, in the rubber crawler of the comparative example, cracks started to occur on the outer surface of the rubber crawler from about 250 hours of travel time, and then the crack extension length increased rapidly. On the other hand, in the rubber crawlers of the examples, cracks did not occur even after 500 hours, and the crack extension length after that did not exceed 50 mm.

本発明は以上の通りであって、ゴムクロ−ラのエンドレス部におけるスチ−ルコ−ド端部の引張り力に伴うクラックの発生を低減できたものであり、有端のゴム弾性体をエンドレス化する構造のゴムクロ−ラに広く使用可能である。   The present invention is as described above, and is capable of reducing the occurrence of cracks due to the tensile force at the end of the steel cord in the endless portion of the rubber crawler, thereby making the endless rubber elastic body endless. Can be widely used in rubber crawlers with structure.

図１はかかるエンドレス部の概念図を示すものである。FIG. 1 shows a conceptual diagram of such an endless portion. 図２は本発明のゴムクロ−ラのエンドレス部を示す図である。FIG. 2 is a view showing an endless portion of the rubber track of the present invention. 図３は本発明のゴムクロ−ラの別のエンドレス部を示す図である。FIG. 3 is a view showing another endless portion of the rubber track of the present invention. 図４は実機耐久試験の結果を示すグラフである。FIG. 4 is a graph showing the results of an actual machine durability test.

符号の説明Explanation of symbols

１１‥有端のゴム弾性帯、
１２‥スチ−ルコ−ド、
１２ａ、１２ｂ‥スチ−ルコ−ド端部、
１３、１３ａ、１３ｂ‥ゴムラグ、
１３ｃ、１３ｄ‥ゴムラグの頂面、
１３ａ０、１３ａ１‥ゴムクロ−ラ基部、
１４‥未加硫ゴム、
２１、２２‥モ−ルド、
３１‥ゴムシ−ト。
４１‥ゴムクロ−ラ外周面。 11. Ended rubber elastic band,
12 Steel code,
12a, 12b ... steel cord end,
13, 13a, 13b ... rubber lugs,
13c, 13d ... the top surface of the rubber lug,
13a0, 13a1 ... rubber crawler base,
14 ... unvulcanized rubber,
21, 22 ... Mold,
31. Rubber sheet.
41 ... The outer surface of the rubber track.

Claims (6)

有端のゴム弾性帯と、このゴム弾性帯中にその長手方向に沿って埋設され、両端部が該ゴム弾性帯より突出したスチ−ルコードとからなり、突出したスチールコード端部を重ね合わせ、該部位における未加硫ゴムを加硫してエンドレス状にしたゴムクローラであって、
ゴムクローラの外周側に重ね合わせられたスチールコード端部に対し、その最も近い位置にあるゴムラグの基部の表面を含む領域を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成し、
前記ゴムラグの基部の表面を含む領域は、隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域であることを特徴とするゴムクローラ。 It consists of a rubber elastic band with ends and a steel cord embedded in the rubber elastic band along its longitudinal direction, and both ends projecting from the rubber elastic band, and overlapping projecting steel cord ends, A rubber crawler in which the unvulcanized rubber in the part is vulcanized to be endless,
A rubber member having a stretch property larger than that of the rubber constituting the rubber lug and the rubber elastic band in the region including the surface of the base portion of the rubber lug closest to the steel cord end portion superimposed on the outer peripheral side of the rubber crawler Consisting of
The region including the surface of the base portion of the rubber lug is a region including the surface of the rubber lug excluding both top surfaces of adjacent rubber lugs and the outer peripheral surface of the rubber crawler. 有端のゴム弾性帯と、このゴム弾性帯中にその長手方向に沿って埋設され、両端部が該ゴム弾性帯より突出したスチ−ルコードとからなり、突出したスチールコード端部を重ね合わせ、該部位における未加硫ゴムを加硫してエンドレス状にしたゴムクローラであって、
ゴムクローラの外周側に重ね合わせられたスチールコード端部が、平面視でゴムラグ領域内に配置され、外周側スチールコードの長手方向の端部より長手方向外側で、最も近い位置にあるゴムラグの基部の表面を含む領域を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成し、
前記ゴムラグの基部の表面を含む領域は、隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域であることを特徴とするゴムクローラ。 It consists of a rubber elastic band with ends and a steel cord embedded in the rubber elastic band along its longitudinal direction, and both ends projecting from the rubber elastic band, and overlapping projecting steel cord ends, A rubber crawler in which the unvulcanized rubber in the part is vulcanized to be endless,
The steel cord end overlapped on the outer circumference side of the rubber crawler is arranged in the rubber lug region in plan view, and the base portion of the rubber lug closest to the outer side in the longitudinal direction from the longitudinal end of the outer circumference side steel cord The region including the surface of the rubber is constituted by a rubber member having a larger elongation characteristic than the rubber constituting the rubber lug and the rubber elastic band ,
The region including the surface of the base portion of the rubber lug is a region including the surface of the rubber lug excluding both top surfaces of adjacent rubber lugs and the outer peripheral surface of the rubber crawler. 有端のゴム弾性帯と、このゴム弾性帯中にその長手方向に沿って埋設され、両端部が該ゴム弾性帯より突出したスチールコードとからなり、突出したスチールコード端部を重ね合わせ、該部位における未加硫ゴムを加硫してエンドレス状にしたゴムクローラであって、
ゴムクローラの外周側に重ね合わせられたスチールコード端部が、平面視でゴムラグ間に配置され、外周側スチールコードの長手方向の端部より長手方向外側で、最も近い位置にあるゴムラグの基部の表面を含む領域を、ゴムラグ及びゴム弾性帯を構成するゴムよりも伸び特性の大きいゴム部材で構成し、
前記ゴムラグの基部の表面を含む領域は、隣り合うゴムラグの両頂面を除いたゴムラグの表面及びゴムクローラ外周面を含む領域であることを特徴とするゴムクローラ。 A rubber elastic band with ends and a steel cord embedded along the longitudinal direction in the rubber elastic band and projecting at both ends from the rubber elastic band, and overlapping the protruding steel cord ends, It is a rubber crawler made by vulcanizing unvulcanized rubber at the site into an endless shape,
The steel cord ends overlapped on the outer periphery side of the rubber crawler are arranged between the rubber lugs in a plan view, and the base of the rubber lug that is closest to the outer end in the longitudinal direction of the outer end side steel cord in the longitudinal direction. The region including the surface is composed of a rubber member having a larger elongation characteristic than the rubber constituting the rubber lug and the rubber elastic band ,
The region including the surface of the base portion of the rubber lug is a region including the surface of the rubber lug excluding both top surfaces of adjacent rubber lugs and the outer peripheral surface of the rubber crawler. 前記ゴムラグの基部の表面を構成するゴム部材は、ゴム硬度（ＪＩＳ・Ａ）が６０度以下である請求項１〜３のいずれか１項に記載のゴムクローラ。The rubber crawler according to any one of claims 1 to 3, wherein the rubber member constituting the surface of the base portion of the rubber lug has a rubber hardness (JIS A) of 60 degrees or less. 前記ゴムラグの基部の表面を構成するゴム部材は、引張り破断伸びＥｂは６００％以上、引張り破断強度Ｔｂは２０ＭＰａ以上である請求項１〜４のいずれか１項に記載のゴムクローラ。The rubber crawler according to any one of claims 1 to 4, wherein the rubber member constituting the surface of the base portion of the rubber lug has a tensile breaking elongation Eb of 600% or more and a tensile breaking strength Tb of 20 MPa or more. 前記ゴムラグの基部の表面を構成するゴム部材は、厚さが２〜５ｍｍである請求項１〜５のいずれか１項に記載のゴムクローラ。The rubber crawler according to any one of claims 1 to 5, wherein the rubber member constituting the surface of the base portion of the rubber lug has a thickness of 2 to 5 mm.
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Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH07223564A (en) * 1994-02-09 1995-08-22 Bridgestone Corp Rubber crawler and shaping thereof
JPH11310170A (en) * 1998-04-28 1999-11-09 Bridgestone Corp Connecting structure for rubber crawler
JP2000177659A (en) * 1998-12-17 2000-06-27 Bridgestone Corp Endless structure of rubber crawler
JP2000247272A (en) * 1999-03-01 2000-09-12 Bridgestone Corp Rubber crawler and its molding method
JP2003002265A (en) * 2001-06-26 2003-01-08 Ohtsu Tire & Rubber Co Ltd :The Elastic crawler and its manufacturing method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07205855A (en) * 1994-01-12 1995-08-08 Bridgestone Corp Single projection driven rubber crawler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07223564A (en) * 1994-02-09 1995-08-22 Bridgestone Corp Rubber crawler and shaping thereof
JPH11310170A (en) * 1998-04-28 1999-11-09 Bridgestone Corp Connecting structure for rubber crawler
JP2000177659A (en) * 1998-12-17 2000-06-27 Bridgestone Corp Endless structure of rubber crawler
JP2000247272A (en) * 1999-03-01 2000-09-12 Bridgestone Corp Rubber crawler and its molding method
JP2003002265A (en) * 2001-06-26 2003-01-08 Ohtsu Tire & Rubber Co Ltd :The Elastic crawler and its manufacturing method

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