JP2006069292A - Structure of rubber crawler - Google Patents

Structure of rubber crawler Download PDF

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JP2006069292A
JP2006069292A JP2004252916A JP2004252916A JP2006069292A JP 2006069292 A JP2006069292 A JP 2006069292A JP 2004252916 A JP2004252916 A JP 2004252916A JP 2004252916 A JP2004252916 A JP 2004252916A JP 2006069292 A JP2006069292 A JP 2006069292A
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rubber
steel cord
rubber crawler
crawler
outer peripheral
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JP4671644B2 (en
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Mitsuo Furuta
満男 古田
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To interrupt growth of a cut blemish by laying high hardness rubber inside, or by laying inside an NR system rubber layer with excellent adhesiveness even when the cut blemish is made in a rubber crawler by receiving a local load by external forces. <P>SOLUTION: The rubber crawler comprises a rubber elastomer, a steel code 4, and a lug 3. The steel code is buried in the longitudinal direction of the rubber elastomer, and the lug is formed on the outer peripheral side of the rubber elastomer. Then, the rubber layer 10 having a hardness of 80 to 95 degrees (JIS A) is included on the outer peripheral side of the steel code. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は耐久性に優れたゴムクロ−ラに関するものである。   The present invention relates to a rubber track excellent in durability.

従来のゴムクロ−ラはゴム弾性体とこの長手方向に一定ピッチをもって芯金を埋設し、この芯金を外囲いしてスチ−ルコ−ドを埋設してなる基本構造を有している。勿論、ゴムクロ−ラが使用に供された際には、走行中に路面の凹凸が直接伝達することになる。従って、ゴムクロ−ラの特に外周側は耐カット性に優れたゴムが用いられている。   A conventional rubber crawler has a basic structure in which a core is embedded with a rubber elastic body and a constant pitch in the longitudinal direction, and a steel cord is embedded around the core. Of course, when the rubber crawler is used, the road surface irregularities are directly transmitted during traveling. Therefore, rubber having excellent cut resistance is used particularly on the outer peripheral side of the rubber track.

しかるに、ゴムクロ−ラにカット傷が生じることは避けられず、カット傷が生じると水分が侵入することとなり、このカット傷の成長につれて水分が奥に入り込み、ついには埋設されているスチ−ルコ−ドに到達することになる。ここに至ると、水分はスチ−ルコ−ドの長手方向に水分が伝達し、ここにスチ−ルコ−ド全体に錆が廻り、ここにスチ−ルコ−ドの劣化によりコ−ドの切断にも至ってしまう。   However, it is inevitable that cut scratches will occur on the rubber crawler. When cut scratches occur, moisture will enter, and moisture will penetrate into the back as the cut scratches grow. Will reach the door. At this point, the moisture is transferred in the longitudinal direction of the steel cord, where rust travels throughout the steel cord, where the steel cord is deteriorated and the cord is cut. Will also come.

他の欠点としては、ゴムにカットが生じないまでも、内部の構造に悪影響をもたらすことは言うまでもなく、ゴムクロ−ラ中に埋設されたスチ−ルコ−ドはゴムと強固に接着しているが、局部的に大きな荷重を受けると、この接着面が剥離する現象も生じる。このため、これに起因してゴム欠け等が発生することもある。   Other disadvantages are that the steel cord embedded in the rubber crawler is firmly bonded to the rubber, not to mention that the rubber will not be cut or will adversely affect the internal structure. When a large load is applied locally, a phenomenon that the adhesive surface peels also occurs. For this reason, rubber chipping or the like may occur due to this.

本発明は以上の課題を解決しようとするものであり、走行路面中に生じる局部的な大荷重に対して特殊な構造によって前記した欠点に対処することを目的とするものである。   SUMMARY OF THE INVENTION The present invention is intended to solve the above-described problems, and an object of the present invention is to cope with the above-mentioned drawbacks by a special structure against a local heavy load generated on a traveling road surface.

本発明の第１の要旨は、ゴム弾性体と、この長手方向に向けて埋設したスチ−ルコ−ドと、ゴム弾性体の外周側に形成されたラグと、よりなるゴムクロ−ラであって、前記スチ−ルコ−ドの外周側に硬度が８０〜９５度（ＪＩＳ・Ａ）のゴム層を内在したことを特徴とするものである。   The first gist of the present invention is a rubber crawler comprising a rubber elastic body, a steel cord embedded in the longitudinal direction, a lug formed on the outer peripheral side of the rubber elastic body, and A rubber layer having a hardness of 80 to 95 degrees (JIS A) is inherently provided on the outer peripheral side of the steel cord.

本発明の第２の要旨は、ゴム弾性体と、この長手方向に向けて埋設したスチ−ルコ−ドと、ゴム弾性体の外周側に形成されたラグと、よりなるゴムクロ−ラであって、前記スチ−ルコ−ドの外周側にＮＲ系の接着性の良好なゴム層を内在したことを特徴とするものである。   The second gist of the present invention is a rubber crawler comprising a rubber elastic body, a steel cord embedded in the longitudinal direction, and a lug formed on the outer peripheral side of the rubber elastic body. The rubber cord is characterized in that an NR-based rubber layer having good adhesion is provided on the outer peripheral side of the steel cord.

本発明は以上の構成を有しており、外力によって局部荷重を受けてゴムクロ−ラにカット傷が生じた場合でも、そのカット傷の成長を、内在させた高硬度のゴムを存在によって、或いはＮＲ系の接着性の良好なゴム層を内在させたことによってここで遮断することができたものである。これによって埋設されているスチ−ルコ−ドにまで水分が達することを阻止したものであり、結果的にカット傷内に入り込む水分によってスチ−ルコ−ドの劣化をもたらさないこととなったものである。   The present invention has the above-described configuration, and even when a cut flaw occurs in a rubber crawler due to a local load due to an external force, the cut flaw grows due to the presence of an internal high hardness rubber, or It was possible to block here by incorporating a rubber layer with good adhesion of NR type. This prevents moisture from reaching the buried steel cord, and as a result, the steel cord does not deteriorate due to moisture entering the cut wound. is there.

本発明はゴムクロ−ラ中に埋設されたスチ−ルコ−ドにカット傷が達しないようにスチ−ルコ−ドの外周側に高硬度ゴム層を介在させた、或いはＮＲ系の接着性の良好なゴム層を内在させたものである。かかるゴム層は、厚さ２〜４ｍｍ程度のものであり、これが薄過ぎればカット傷の遮断がだんだん難しくなり、厚過ぎれば、曲げ抵抗が大きくなり過ぎエネルギ−ロスに繋がることとなってしまう。   In the present invention, a high-hardness rubber layer is interposed on the outer peripheral side of the steel cord so that the cut cord does not reach the steel cord embedded in the rubber crawler, or the adhesiveness of the NR system is good. A rubber layer is embedded. Such a rubber layer has a thickness of about 2 to 4 mm, and if it is too thin, it becomes more difficult to cut cuts, and if it is too thick, the bending resistance becomes too high, leading to energy loss.

通常のゴムクロ−ラにあっては、内周側ゴムの硬度は６０〜８０度、外周側のゴム硬度は６０〜７５度であり、特に７５度以上の高硬度のものは屈曲疲労によるゴム亀裂を生じ易く実用的でない。このため、本発明の第１においては高硬度ゴムをゴムクロ−ラの内部に層を成して内在させカット傷に対処させたものである。   In a normal rubber crawler, the inner peripheral rubber has a hardness of 60 to 80 degrees, and the outer peripheral rubber has a hardness of 60 to 75 degrees. Is not practical. For this reason, in the first aspect of the present invention, the high hardness rubber is formed in a layer inside the rubber crawler to deal with cut scratches.

一方、本発明の第２はＮＲ系ゴム層を内在させてスチ−ルコ−ドや芯金に強固に接着するゴム層をもってゴム剥離やゴム欠けの発生を阻止したものである。   On the other hand, according to the second aspect of the present invention, an NR rubber layer is contained and a rubber layer that adheres firmly to a steel cord or a core metal prevents the occurrence of rubber peeling or rubber chipping.

かかる高硬度ゴム或いはＮＲ系ゴム層は未加硫ゴムによってシ−トを形成し、このシ−トをゴムクロ−ラの成形の際に未加硫ゴムにて覆ったいわゆるゴムコ−テッドスチ−ルコ−ドと重ねて金型内に充填し、全ての未加硫ゴムを加硫成形して得られることになる。かかるゴム層は通常はスチ−ルコ−ドの左右幅の端部とほぼ合致させるものであるが、場合によっては、この左右幅端を越え、更に芯金の翼部の左右端を越えて外方に伸びて存在させることもでき、これによってゴムクロ−ラのいわゆる耳部の折れ曲がりが阻止でき、特に芯金の左右端部におけるクラックの発生を阻止できることになる。   Such a high hardness rubber or NR rubber layer is formed of a sheet made of unvulcanized rubber, and this sheet is covered with unvulcanized rubber when molding a rubber crawler, so-called rubber coated steel coat. It is obtained by overlapping all the unvulcanized rubber with a metal mold and filling in a mold. Such a rubber layer is usually substantially aligned with the left and right ends of the steel cord. However, in some cases, the rubber layer extends beyond the left and right ends and further beyond the left and right ends of the wings of the core metal. It is possible to prevent the rubber crawler from bending at the so-called ear part, and particularly to prevent the occurrence of cracks at the left and right end parts of the core metal.

以下、本発明を図面をもって更に説明する。図１は本発明の第１におけるゴムクロ−ラの断面図であり、ゴムクロ−ラは紙面の表裏に連続する。１はゴムクロ−ラを構成するゴム材、２は一定ピッチで埋設された芯金、３はゴムクロ−ラの外周表面に形成されたラグである。そして、芯金２の翼部を外周側より囲んでスチ−ルコ−ド４がゴムクロ−ラの長手方向に埋設されている。   Hereinafter, the present invention will be further described with reference to the drawings. FIG. 1 is a cross-sectional view of a rubber track according to the first embodiment of the present invention, and the rubber track is continuous on the front and back of the paper. Reference numeral 1 denotes a rubber material constituting the rubber crawler, 2 denotes a cored bar embedded at a constant pitch, and 3 denotes a lug formed on the outer peripheral surface of the rubber crawler. A steel cord 4 is embedded in the longitudinal direction of the rubber crawler so as to surround the wing portion of the core metal 2 from the outer peripheral side.

さて、スチ−ルコ−ド４の外周側に厚さ２ｍｍの硬度９５度（ＪＩＳ・Ａ）のゴム層１０を内在させたものである。かかるゴム層１０はスチ−ルコ−ド４の左右幅とほぼ同じ幅に埋設させたものである。   A rubber layer 10 having a hardness of 95 degrees (JIS A) having a thickness of 2 mm is provided on the outer peripheral side of the steel cord 4. The rubber layer 10 is embedded in substantially the same width as the left and right width of the steel cord 4.

尚、製法の例としては、図２に示すように下金型内に内周側を形成する未加硫ゴムシ−ト５を載置し、この上に芯金２、未加硫ゴム６にて表裏をコ−トしたスチ−ルコ−ド４、高硬度ゴム層１０を構成するゴムシ−ト７、そして、ゴムクロ−ラの外周側及びラグを形成する未加硫ゴム８を重ね、上金型にてプレスしながら加熱成形するものである。   As an example of the manufacturing method, as shown in FIG. 2, an unvulcanized rubber sheet 5 that forms the inner peripheral side is placed in a lower mold, and a core metal 2 and an unvulcanized rubber 6 are mounted on the sheet. The steel cord 4 coated with the front and back sides, the rubber sheet 7 constituting the high hardness rubber layer 10, and the unvulcanized rubber 8 forming the lug on the outer peripheral side of the rubber crawler are stacked. Heat forming while pressing with a mold.

ゴムクロ−ラの外周側にカット傷が生じた場合、通常ではこのカット傷が徐々に成長し、埋設されているスチ−ルコ−ド４に達し、ここに水分が入り込んでスチ−ルコ−ド４が錆びたり、このため切断したりする。しかしながら、本発明のゴムクロ−ラにあっては、カット傷は高硬度ゴム層１０に至ってこれが止まり、水分がスチ−ルコ−ド４に達することがなくなったものである。   When a cut flaw occurs on the outer peripheral side of the rubber crawler, normally, the cut flaw gradually grows and reaches the embedded steel code 4 where moisture enters and the steel code 4 Rusts or cuts for this reason. However, in the rubber crawler of the present invention, the cut flaw reaches the high hardness rubber layer 10 and stops, and the moisture does not reach the steel code 4.

図３は別の例を示す断面図であり、芯金２の翼部の左右端部の範囲内でスチ−ルコ−ド４が配置され、次いで高硬度ゴム層１０はこれら端部よりも外側に突出（１０ａ）させて埋設させたものである。通常、芯金の幅方向の外側は走行面側の突出物等に乗り上げ、ここが折り曲げ現象（いわゆる耳部の折り曲げ）が発生し、繰り返しの折り曲げにより芯金端部にクラックを生じてしまう。しかるに、本発明のゴムクロ−ラにあっては、高硬度のゴム層１０ａがかかる耳部に内在しているため、折り曲げの発生も少なくなり、耳切れ等の発生も著しく少なくなるという特徴も兼ね備えている。   FIG. 3 is a cross-sectional view showing another example, in which the steel cord 4 is disposed within the range of the left and right end portions of the wing portion of the core metal 2, and then the high-hardness rubber layer 10 is outside the end portions. It is made to protrude (10a) and embedded. Usually, the outer side in the width direction of the core bar rides on a projecting object or the like on the running surface side, and a bending phenomenon (so-called bending of the ear portion) occurs, and cracks are generated at the end of the core bar due to repeated bending. However, in the rubber crawler of the present invention, since the high hardness rubber layer 10a is inherent in the ear portion, the occurrence of bending is reduced and the occurrence of the ear breakage is remarkably reduced. ing.

第２発明にあっては上記の高硬度ゴム層に代わってＮＲ系ゴム層を内在させたものである。このため、外周側のゴムとスチ−ルコ−ド（或いは芯金）はこのＮＲ系ゴム層を挟んで強固に接着され、ゴムの剥離が発生することが極めて提言できたものである。尚、ＮＲ系ゴムとはＮＲゴム成分が６０％以上のものを言い、これに通常の加硫剤、加硫促進剤、補強剤、軟化剤等を配合したものである。   In the second invention, an NR rubber layer is incorporated in place of the high hardness rubber layer. For this reason, it has been highly recommended that the rubber on the outer peripheral side and the steel cord (or the core metal) are firmly bonded with the NR rubber layer interposed therebetween, and the rubber is peeled off. The NR rubber refers to rubber having an NR rubber component of 60% or more, and is blended with a normal vulcanizing agent, vulcanization accelerator, reinforcing agent, softening agent and the like.

本発明は以上の通りの構造を有しており、上記した芯金が埋設したゴムクロ−ラは勿論のこと、芯金のないいわゆる芯金レスゴムクロ−ラにも適用可能であり、その利用範囲は極めて広い。   The present invention has the structure as described above, and can be applied not only to the rubber crawler embedded with the above-described cored bar but also to a so-called coreless rubber crawler without a cored bar. Extremely wide.

図１は本発明のゴムクロ−ラの断面図である。FIG. 1 is a cross-sectional view of a rubber track of the present invention. 図２は本発明のゴムクロ−ラの製造の概念図である。FIG. 2 is a conceptual diagram of the production of the rubber track of the present invention. 図３は本発明のゴムクロ−ラの他の例を示す断面図である。FIG. 3 is a sectional view showing another example of the rubber track of the present invention.

符号の説明Explanation of symbols

１‥ゴムクロ−ラを構成するゴム材、
２‥芯金、
３‥ラグ、
４‥スチ−ルコ−ド、
１０、１０ａ‥高硬度ゴム層。 1. Rubber material constituting rubber crawler
2. Core metal,
3 ... Rug,
4. Steel code,
10, 10a. High hardness rubber layer.

Claims (6)

ゴム弾性体と、この長手方向に向けて埋設したスチ−ルコ−ドと、ゴム弾性体の外周側に形成されたラグと、よりなるゴムクロ−ラであって、前記スチ−ルコ−ドの外周側に硬度が８０〜９５度（ＪＩＳ・Ａ）のゴム層を内在したことを特徴とするゴムクロ−ラ。   A rubber crawler comprising a rubber elastic body, a steel cord embedded in the longitudinal direction, a lug formed on the outer peripheral side of the rubber elastic body, and an outer periphery of the steel cord A rubber crawler characterized by having a rubber layer having a hardness of 80 to 95 degrees (JIS A) on the side. ゴム弾性体と、この長手方向に向けて埋設したスチ−ルコ−ドと、ゴム弾性体の外周側に形成されたラグと、よりなるゴムクロ−ラであって、前記スチ−ルコ−ドの外周側にＮＲ系の接着性の良好なゴム層を内在したことを特徴とするゴムクロ−ラ。   A rubber crawler comprising a rubber elastic body, a steel cord embedded in the longitudinal direction, a lug formed on the outer peripheral side of the rubber elastic body, and an outer periphery of the steel cord A rubber crawler characterized in that an NR-based rubber layer having good adhesion is provided on the side. 前記ゴム弾性体中に一定ピッチをもって芯金を埋設した請求項１又は２記載のゴムクロ−ラ。   The rubber crawler according to claim 1 or 2, wherein a cored bar is embedded in the rubber elastic body at a constant pitch. 前記ゴム層が芯金の翼部端よりも外側にまで存在させた請求項１乃至３いずれか１項記載のゴムクロ−ラ。   The rubber crawler according to any one of claims 1 to 3, wherein the rubber layer is present outside the wing end of the core metal. 前記ゴム層がスチ−ルコ−ドの左右端よりも外側にまで存在させた請求項１又は２記載のゴムクロ−ラ。   3. The rubber crawler according to claim 1, wherein the rubber layer is present outside the left and right ends of the steel cord. 前記ゴム層が２〜４ｍｍの厚さを有する請求項１乃至５いずれか記載のゴムクロ−ラ。   The rubber crawler according to any one of claims 1 to 5, wherein the rubber layer has a thickness of 2 to 4 mm.
JP2004252916A 2004-08-31 2004-08-31 Structure of rubber track Expired - Fee Related JP4671644B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008062830A (en) * 2006-09-08 2008-03-21 Bridgestone Corp Rubber crawler and its manufacturing method
JP2008094240A (en) * 2006-10-11 2008-04-24 Sumitomo Rubber Ind Ltd Elastic crawler

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03118880U (en) * 1990-03-15 1991-12-09
JPH0612278U (en) * 1992-01-28 1994-02-15 オーツタイヤ株式会社 Elastic crawler
JPH06144310A (en) * 1992-11-04 1994-05-24 Bridgestone Corp Rubber crawler
JPH1191652A (en) * 1997-09-26 1999-04-06 Yokohama Rubber Co Ltd:The Endless track belt and its manufacture
JPH11321731A (en) * 1998-05-19 1999-11-24 Bridgestone Corp Rubber crawler
JP2000326879A (en) * 1999-05-21 2000-11-28 Bridgestone Corp Rubber crawler excellent in rectilinear advancing property and manufacture thereof
JP2004114787A (en) * 2002-09-25 2004-04-15 Sumitomo Rubber Ind Ltd Elastic crawler

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03118880U (en) * 1990-03-15 1991-12-09
JPH0612278U (en) * 1992-01-28 1994-02-15 オーツタイヤ株式会社 Elastic crawler
JPH06144310A (en) * 1992-11-04 1994-05-24 Bridgestone Corp Rubber crawler
JPH1191652A (en) * 1997-09-26 1999-04-06 Yokohama Rubber Co Ltd:The Endless track belt and its manufacture
JPH11321731A (en) * 1998-05-19 1999-11-24 Bridgestone Corp Rubber crawler
JP2000326879A (en) * 1999-05-21 2000-11-28 Bridgestone Corp Rubber crawler excellent in rectilinear advancing property and manufacture thereof
JP2004114787A (en) * 2002-09-25 2004-04-15 Sumitomo Rubber Ind Ltd Elastic crawler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008062830A (en) * 2006-09-08 2008-03-21 Bridgestone Corp Rubber crawler and its manufacturing method
JP2008094240A (en) * 2006-10-11 2008-04-24 Sumitomo Rubber Ind Ltd Elastic crawler

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