JP4348106B2 - Rubber crawler molding method and rubber crawler - Google Patents

Rubber crawler molding method and rubber crawler Download PDF

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Publication number
JP4348106B2
JP4348106B2 JP2003099202A JP2003099202A JP4348106B2 JP 4348106 B2 JP4348106 B2 JP 4348106B2 JP 2003099202 A JP2003099202 A JP 2003099202A JP 2003099202 A JP2003099202 A JP 2003099202A JP 4348106 B2 JP4348106 B2 JP 4348106B2
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Prior art keywords
rubber
rubber crawler
molding
recess
protrusion
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Japanese (ja)
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JP2004306651A (en
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修一 松尾
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Bridgestone Corp
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Bridgestone Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、車両の走行部に使用されるゴムクロ−ラに関するものであって、特に、ゴムクロ−ラの内周面より突出する突起の改良に係るものである。
【0002】
【従来の技術】
一般には、ゴムクロ−ラの内周面にその長手方向に向って突起が連続的に形成されており、かかる突起はスプロケットからの駆動力の伝達に供され、或いは転輪との外れ防止として機能している。特に転輪との間の外れ防止にあっては、ゴムクロ−ラが横方向の力を受け、転輪との間に相対的にズレを生じた場合、転輪を突起との間で接触・衝突が繰り返され、このズレを元の状態に戻そうとすることになる。このため、突起に摩擦力が加えられ転輪との間で脱輪が生じ、更には摩耗や破損が生じることとなる。このことは、転輪のみで生じるものではなく、駆動輪や遊動輪についても同様である。
【0003】
図1はかかる問題点に対して従来より提案されている(特許文献1)ものであり、特にゴム突起30の左右の傾斜面30aが磨耗するため、これに対処するためにゴム突起30の左右を貫いて低磨耗性のプラスチックの部材40が埋設されている。このプラスチック部材40の左右端40aが転輪(以下、転輪をもって説明する)に接触し、突起を保護する構造となっている。
【0004】
【特許文献1】
特開平10−53171号
【0005】
しかるに、ゴム突起30の左右傾斜面30aと低摩耗部材40の左右端面は同一平面をなしているのが好ましいが、低摩耗部材40がゴム突起30の左右傾斜面30aより突出するケースが多い。これは、低摩耗部材40のコストを安くすること、ゴム突起の形状(左右の表面が斜めになっている)、ゴムクローラの成形モールド(特にゴム突起を生成する形状)に由来することが原因であり、一般には低摩耗部材40の左右先端40aを特に斜めに切断することはせず、これをそのまま用い、ゴム突起30を形成するためのモールドキャビティに刻設した溝内にセットするものであり、溝分だけ低摩耗部材40の左右端40aがゴム突起30の左右傾斜面より突出した構造とされるものである。
【0006】
従って、転輪との接触は主として低摩耗部材40のしかも突出した先端40aであり、このため、確かにゴム突起30の側面30aの磨耗は減少したが、別異の課題が発生してしまう。即ち、低摩耗部材40に大きな外力が加わることになるため、この低摩耗部材40の欠損が生じ、更に、低摩耗部材40がゴム中で動かされる働きによりゴムとの界面の接着が剥離し、ここに砂や小石が入り込み結果としてゴム突起30が欠損してしまうという欠点ももたらされる。
【0007】
従って、低摩耗部材40はできるだけその左右端面40aをゴム突起30の左右面30aと合致されるのが好ましいが、成形中のゴムの流れにより低摩耗部材40が回転することは避けられず、特に左右の面40aを傾斜切断した場合には低摩耗部材40が回転することは許されず、きわめて特定の位置にセットする必要があり、このため製造工程は複雑となり、これ又、コストアップとなることは避けられなかった。
【0008】
【発明が解決しようとする課題】
本発明は以上のような従来のゴム突起内に埋設した低摩耗部材の欠点を改良せんとするものであり、例え低摩耗部材の左右端が斜めに切断されている場合でも、突起の所定位置に完全にセットさせる技術を提供するものである。
【0009】
【課題を解決するための手段】
本発明の要旨は、ゴムクローラの内周面を区画し、その中央に一定ピッチをもってゴム突起を形成する窪みを備えた成形モ−ルド(A)と、ゴムクローラの外周面を区画する成形モ−ルド(B)と、を組み合わせて成形キャビティを形成し、ゴムクローラを構成する各種素材とこれらを埋設してゴム素材が充填されて加硫成形してなるゴムクローラの成形方法であって、成形モ−ルド(A)を下型とし、前記窪みの左右傾斜面に突起を形成してなり、低摩耗部材の左右に前記窪みの左右の傾斜面と同じ傾斜面を形成すると共にこの傾斜面に前記突起と嵌合する凹みを形成し、前記傾斜面の突起に当該低摩耗部材の凹みを嵌め込み、かかる成形キャビティ内に未加硫ゴム素材が充填され、これが加硫成形されたゴムクローラの成形方法である。また、請求項1〜請求項3の何れか1項に記載のゴムクローラの成形方法を用いて成形されたゴムクローラである。
【0010】
【発明の実施の形態】
本発明は以上のような構成を採用するものであり、特に転輪と常に係合・接触する突起にあって、この転輪や他の部材との接触・衝突が繰り返される左右の側面部に低摩耗部材を面より突出することなく露出させたものである。従って、特に転輪のズレを制御する場合にあっても、突起と転輪との間の脱輪性の改良がなされ、しかも突起の摩耗等が少なく、しかも走行抵抗も小さいゴムクロ−ラが得られることとなったものである。
【0011】
本発明で用いられる低摩耗部材を構成する樹脂部材としては、6ナイロン、6、6ナイロン、ポリウレタン、ポリアセタ−ル、ポリプロピレン、ポリエチレンテレフタレ−ト、ポリブチレンテレフタレ−ト、ポリカ−ボネ−ト、ポリスチレン、アクリルニトリルブタジエンスチレン共重合樹脂、ポリ塩化ビニル、ポリ酢酸ビニル、ポリエチレン等が挙げられるが、中でも6−ナイロン、6、6ナイロン、ポリウレタン、ポリアセタ−ル、ポリプロピレンが好んで用いられる。尚、ガラス繊維にて強化された樹脂も適用可能である。更に言えば、樹脂部材の形状としては棒状体、板状体、筒状体、盤状体、ダンベル状体等任意の形状の部材が用いられ得る。勿論、低摩耗部材はゴム突起の左右傾斜面に合致させた傾斜面を備えたものであり、この傾斜面にはゴム突起を形成するモ−ルドの窪みに備えた突起と嵌め合わされる凹みを形成しておくものであり、これによって成形中に低摩耗部材の回転等の動きはなくなり、所定の位置にかかる部材が埋設されることになる。
【0012】
ゴムクロ−ラの成形方法について付言すれば、成形キャビティ内に引っ張り補強部材としてのスチ−ルコ−ドが配置され、他の補助帆布等も必要に応じて配置される。そして、この前後左右よりゴム材をもって加硫成形するものであり、内周側を区画するモ−ルドには突起を形成する窪みを、そして外周側を区画するモ−ルドにはラグを形成する窪みが備えられている。
【0013】
【実施例】
以下、本発明を実施例に基づいて更に詳細に説明する。
図2は本発明のゴムクロ−ラに用いられる低摩耗部材(6、6ナイロン)20の平面図、図3は正面図、図4は側面図、図5はC−C線端部断面図である。この例では、中央20aがやや細目とされ、左右が太い棒体20bであり、断面が丸い部材であって、その中央20aの上部には補強用の突起20cが形成されている。左右の棒体20bの側面はゴム突起と略同じ傾斜面20dをなし、この例では中央部がやや膨出した湾曲部としたもので、上部よりキ−状に凹み20eを形成したものである。傾斜面20dはゴム突起の傾斜面と一致する形状となっている。
【0014】
図6はゴムクロ−ラを成形する成形モ−ルド(A)、(B)の主要切断図であり、成形モ−ルド(A)はゴムクロ−ラの内周面を区画し、その中央に一定ピッチをもってゴム突起を形成する窪み10を備えたもので、通常はこれを下型とする。一方、成形モ−ルド(B)はゴムクロ−ラの外周面を区画するものである。そして、窪み10の左右傾斜面10aにキ−状の突起10bを形成したものである。
【0015】
そして、図7のように窪み10の左右傾斜面10aに形成したキ−状の突起10bに対し、前記した低摩耗部材20の凹み20eをもって嵌め込み、窪み10の左右傾斜面10aと低摩耗部材20の傾斜面20dとを合わせ、かつ、低摩耗部材20が回転しないようにしたものである。
【0016】
この状態を保って成形キャビティ内に未加硫ゴム材を満たした後、これを加硫成形してゴムクロ−ラが完成するものである。図8は得られたゴムクロ−ラの断面図である。1は得られたゴムクロ−ラであり、2はゴム突起、3はラグである。4はゴムクロ−ラ1の長手方向に埋設されたスチ−ルコ−ドである。さて、ゴム突起2には低摩耗部材20が埋設されており、成形時にこの低摩耗部材20が回転することなくゴム中に埋設され、ゴム突起2の左右傾斜面2a、2bと低摩耗部材20の左右傾斜面20dは同一面とされている。そして、傾斜面20dにはキ−状の突起10bと嵌め合わせるための凹み20eが露呈していることになるが、これはゴムクロ−ラの性能上全く問題のない構成である。
【0017】
尚、低摩耗部材20を窪み10に納め、この状態を維持しつつゴムクロ−ラの基体を構成するゴム材料をキャビティ内に充填することにより得られ、両者はゴム1の加硫時の接着力によって加硫接着させて一体化させるものであるが、場合によってはフェノ−ル系、エポキシ系、ゴム系等の接着剤を一種若しくはこれらを組み合わせて用いて加硫接着することもある。
【0018】
ゴム突起2の両側面2a、2bに低摩耗部材20の左右傾斜面20dが突出することなく露呈している状態であり、転輪、アイドラ−、スプロケット等との接触・衝突時にこれらと接触するものであり、低摩耗部材20の特性よりこれらとの間での脱輪が減少し、又摩耗や破損が少なく、走行抵抗も著しく低下し、更には振動・騒音の発生も低減することとなる。勿論、ゴムと棒体との境界面も剥離することは極めて少なくなり、ゴムクロ−ラの寿命の向上に大きく寄与したものである。
【0019】
【発明の効果】
本発明は以上の構成を採用したものであり、低摩耗部材の左右端が斜めに切断されている場合でも、突起の所定位置に低摩耗部材を完全にセットさせることができる。また、本発明は以上の構成で形成されたゴムクローラであり、ゴムクロ−ラの特に機体側に備えられた転輪等との接触・衝突が繰り返されるゴム突起にあって、特殊な性状の耐摩耗部材を露呈させてなるものである。このため、特に転輪とのズレによる接触・衝突が生じたとしても、摩耗や破損が極く少なくなり、更に走行抵抗も減少することとなり、ゴムクロ−ラの寿命が著しく向上したものとなった。
【図面の簡単な説明】
【図1】図1は従来のゴムクロ−ラのゴム突起における断面図である。
【図2】図2は本発明のゴムクロ−ラに用いられる低摩耗部材の平面図である。
【図3】図3は図2の正面図である。
【図4】図4は図2の側面図である。
【図5】図5は図4のC−C線端部断面図である。
【図6】図6はゴムクロ−ラを成形する成形モ−ルドの主要切断図である。
【図7】図7は成形モ−ルド(A)と低摩耗部材との関係を示す図である。
【図8】図8は得られたゴムクロ−ラの断面図である。
【符号の説明】
A、B ゴムクロ−ラを成形する成形モ−ルド、
10 ゴム突起を形成する窪み、
10a 窪みの左右の傾斜面、
10b 窪みの傾斜面に形成したキ−状の突起、
20 低摩耗部材、
20d 低摩耗部材の左右傾斜面、
20e 低摩耗部材の左右傾斜面に形成された凹み。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber track used in a traveling part of a vehicle, and particularly relates to an improvement of a protrusion protruding from an inner peripheral surface of the rubber track.
[0002]
[Prior art]
Generally, protrusions are continuously formed on the inner peripheral surface of the rubber crawler in the longitudinal direction, and these protrusions are used for transmission of driving force from the sprocket or function to prevent disengagement from the wheel. is doing. Especially for preventing slippage between the rollers, if the rubber crawler receives a lateral force and causes a relative displacement with the rollers, contact the rollers with the protrusions. The collision will be repeated and this deviation will be restored. For this reason, a frictional force is applied to the protrusions, causing a wheel to be removed from the wheel, and further causing wear and breakage. This is not only caused by the rolling wheels, but also applies to the driving wheels and the idle wheels.
[0003]
FIG. 1 has been proposed for this problem (Patent Document 1). In particular, since the left and right inclined surfaces 30a of the rubber protrusion 30 are worn, the left and right sides of the rubber protrusion 30 are dealt with. A low-abrasion plastic member 40 is embedded therethrough. The left and right ends 40a of the plastic member 40 are in contact with a wheel (hereinafter described with the wheel) to protect the protrusion.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-53171
However, the left and right inclined surfaces 30a of the rubber protrusions 30 and the left and right end surfaces of the low wear member 40 are preferably in the same plane, but in many cases, the low wear members 40 protrude from the left and right inclined surfaces 30a of the rubber protrusions 30. This is because the cost of the low-abrasion member 40 is reduced, the shape of the rubber protrusion (the left and right surfaces are slanted), and the rubber crawler molding mold (particularly the shape that generates the rubber protrusion). In general, the left and right tips 40a of the low-abrasion member 40 are not particularly cut obliquely, but are used as they are, and are set in grooves formed in a mold cavity for forming the rubber protrusions 30. There is a structure in which the left and right ends 40 a of the low wear member 40 protrude from the left and right inclined surfaces of the rubber protrusion 30 by the amount of the groove.
[0006]
Therefore, the contact with the wheel is mainly the protruding end 40a of the low wear member 40. For this reason, the wear of the side surface 30a of the rubber protrusion 30 is certainly reduced, but a different problem occurs. That is, since a large external force is applied to the low-abrasion member 40, the low-abrasion member 40 is lost, and the low-abrasion member 40 is moved in the rubber, and the adhesion at the interface with the rubber is peeled off. There is also a disadvantage that the rubber protrusion 30 is lost as a result of sand and pebbles entering here.
[0007]
Therefore, it is preferable that the left and right end surfaces 40a of the low wear member 40 be aligned with the left and right surfaces 30a of the rubber protrusions 30 as much as possible. However, it is inevitable that the low wear member 40 rotates due to the flow of rubber during molding. When the left and right surfaces 40a are cut at an angle, the low wear member 40 is not allowed to rotate and must be set at a very specific position, which complicates the manufacturing process and increases costs. Was inevitable.
[0008]
[Problems to be solved by the invention]
The present invention is intended to improve the drawbacks of the low wear member embedded in the conventional rubber protrusion as described above. Even when the left and right ends of the low wear member are cut obliquely, the predetermined position of the protrusion is determined. The technology to make it completely set.
[0009]
[Means for Solving the Problems]
The gist of the present invention is that a molding mold (A) having an inner peripheral surface of a rubber crawler and having a recess at the center for forming a rubber projection at a constant pitch, and a molding model for partitioning the outer peripheral surface of the rubber crawler. -Mold (B), forming a molding cavity, various materials constituting a rubber crawler, and a rubber crawler molding method in which these are embedded and filled with a rubber material and vulcanized, forming mode - field (a) and a lower die, it forms a protrusion on the right and left inclined surface of the recess, this so as to form the same inclined plane as the left and right inclined surfaces of the front Symbol recess to the left or right of the low wear member A rubber formed by forming a recess to be fitted with the protrusion on the inclined surface, fitting the recess of the low wear member into the protrusion on the inclined surface, and filling the molding cavity with an unvulcanized rubber material. This is a crawler forming method. Moreover, it is a rubber crawler shape | molded using the rubber crawler shaping | molding method of any one of Claims 1-3.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention employs the above-described configuration, particularly in a protrusion that is always engaged / contacted with the wheel, on the left and right side portions where contact / collision with the wheel and other members are repeated. The low wear member is exposed without protruding from the surface. Therefore, even when the deviation of the wheel is controlled, it is possible to obtain a rubber crawler that improves the wheel-removing property between the protrusion and the wheel, reduces wear of the protrusion, and has low running resistance. It has been decided that
[0011]
As the resin member constituting the low wear member used in the present invention, 6 nylon, 6, 6 nylon, polyurethane, polyacetal, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polycarbonate , Polystyrene, acrylonitrile butadiene styrene copolymer resin, polyvinyl chloride, polyvinyl acetate, polyethylene and the like, among which 6-nylon, 6, 6 nylon, polyurethane, polyacetal and polypropylene are preferably used. A resin reinforced with glass fiber is also applicable. Furthermore, as the shape of the resin member, a member having an arbitrary shape such as a rod-like body, a plate-like body, a tubular body, a disk-like body, or a dumbbell-like body can be used. Of course, the low-abrasion member is provided with an inclined surface that matches the left and right inclined surfaces of the rubber protrusion, and the inclined surface has a recess fitted to the protrusion provided in the mold recess forming the rubber protrusion. Thus, there is no movement such as rotation of the low wear member during molding, and the member at a predetermined position is buried.
[0012]
If it adds about the molding method of a rubber crawler, the steel cord as a tension reinforcement member will be arrange | positioned in a shaping | molding cavity, and another auxiliary canvas etc. will also be arrange | positioned as needed. The rubber material is vulcanized from the front, rear, left, and right, and a recess that forms a protrusion is formed in the mold that defines the inner peripheral side, and a lug is formed in the mold that defines the outer peripheral side. A depression is provided.
[0013]
【Example】
Hereinafter, the present invention will be described in more detail based on examples.
2 is a plan view of a low wear member (6, 6 nylon) 20 used in the rubber track of the present invention, FIG. 3 is a front view, FIG. 4 is a side view, and FIG. is there. In this example, the center 20a is slightly finer, the left and right bars 20b are thick, and the cross section is a round member. A reinforcing projection 20c is formed on the upper portion of the center 20a. The side surfaces of the left and right rod bodies 20b have substantially the same inclined surfaces 20d as the rubber protrusions. In this example, the central portion is a slightly bulging curved portion, and a dent 20e is formed in a key shape from the top. . The inclined surface 20d has a shape that matches the inclined surface of the rubber protrusion.
[0014]
FIG. 6 is a main cut view of molding molds (A) and (B) for molding a rubber crawler. The molding mold (A) defines the inner peripheral surface of the rubber crawler and is constant at the center. This is provided with a recess 10 that forms a rubber protrusion with a pitch, and this is usually a lower mold. On the other hand, the molding mold (B) defines the outer peripheral surface of the rubber crawler. A key-like protrusion 10b is formed on the left and right inclined surface 10a of the recess 10.
[0015]
Then, as shown in FIG. 7, the key-like protrusion 10b formed on the left and right inclined surface 10a of the recess 10 is fitted with the recess 20e of the low wear member 20, and the left and right inclined surface 10a of the recess 10 and the low wear member 20 are inserted. And the low wear member 20 is prevented from rotating.
[0016]
After maintaining this state, the molding cavity is filled with an unvulcanized rubber material, and then this is vulcanized and molded to complete a rubber crawler. FIG. 8 is a sectional view of the obtained rubber crawler. 1 is the rubber crawler obtained, 2 is a rubber protrusion, and 3 is a lug. A steel cord 4 is embedded in the longitudinal direction of the rubber crawler 1. Now, the low-wear member 20 is embedded in the rubber protrusion 2, and this low-wear member 20 is embedded in the rubber without rotating during molding, and the left and right inclined surfaces 2 a and 2 b of the rubber protrusion 2 and the low-wear member 20 are embedded. The left and right inclined surfaces 20d are the same surface. The inclined surface 20d is exposed with a recess 20e for fitting with the key-like protrusion 10b, but this is a configuration that has no problem in the performance of the rubber crawler.
[0017]
The low-abrasion member 20 is placed in the recess 10 and is obtained by filling the cavity with a rubber material constituting the base of the rubber tracker while maintaining this state. However, in some cases, the adhesive may be vulcanized and bonded using one or a combination of phenolic, epoxy and rubber adhesives.
[0018]
The left and right inclined surfaces 20d of the low wear member 20 are exposed without protruding on both side surfaces 2a, 2b of the rubber projection 2, and contact with these when contacting or colliding with a wheel, idler, sprocket or the like. Due to the characteristics of the low-abrasion member 20, the wheel slippage between them is reduced, the wear and breakage is reduced, the running resistance is remarkably reduced, and the generation of vibration and noise is also reduced. . Of course, the interface between the rubber and the rod is hardly peeled off, which greatly contributes to the improvement of the life of the rubber crawler.
[0019]
【The invention's effect】
The present invention employs the above-described configuration, and even when the left and right ends of the low wear member are cut obliquely, the low wear member can be completely set at a predetermined position of the protrusion. Further, the present invention is a rubber crawler formed in the above-described configuration, which is a rubber protrusion that repeatedly contacts and collides with a roller provided on the fuselage side of the rubber crawler, and has a special property. The wear member is exposed. For this reason, even if contact / collision due to misalignment with the rolling wheels occurs, wear and damage are extremely reduced, and running resistance is also reduced, and the life of the rubber crawler is remarkably improved. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rubber protrusion of a conventional rubber crawler.
FIG. 2 is a plan view of a low wear member used in the rubber track of the present invention.
FIG. 3 is a front view of FIG. 2;
4 is a side view of FIG. 2. FIG.
FIG. 5 is a cross-sectional view taken along line CC in FIG.
FIG. 6 is a main cutaway view of a molding mold for molding a rubber crawler.
FIG. 7 is a view showing a relationship between a molding mold (A) and a low wear member.
FIG. 8 is a cross-sectional view of the obtained rubber crawler.
[Explanation of symbols]
A, B Molds for molding rubber crawlers,
10 depressions that form rubber protrusions,
10a Left and right inclined surfaces of the depression,
10b Key-shaped protrusions formed on the inclined surface of the depression,
20 low wear parts,
20d Left and right inclined surfaces of the low wear member,
20e A recess formed in the left and right inclined surfaces of the low wear member.

Claims (4)

ゴムクローラの内周面を区画し、その中央に一定ピッチをもってゴム突起を形成する窪みを備えた成形モ−ルド(A)と、ゴムクローラの外周面を区画する成形モ−ルド(B)と、を組み合わせて成形キャビティを形成し、ゴムクローラを構成する各種素材とこれらを埋設してゴム素材が充填されて加硫成形してなるゴムクローラの成形方法であって、
成形モ−ルド(A)を下型とし、前記窪みの左右傾斜面に突起を形成してなり、
低摩耗部材の左右に前記窪みの左右の傾斜面と同じ傾斜面を形成すると共にこの傾斜面に前記突起と嵌合する凹みを形成し、
前記傾斜面の突起に当該低摩耗部材の凹みを嵌め込み、かかる成形キャビティ内に未加硫ゴム素材が充填され、これが加硫成形されたことを特徴とするゴムクローラの成形方法。
A molding mold (A) having a recess that forms an inner peripheral surface of the rubber crawler and forming rubber projections at a constant pitch at the center thereof, and a molding mold (B) that partitions the outer peripheral surface of the rubber crawler , And forming a molding cavity, various materials constituting a rubber crawler, and a rubber crawler molding method in which these are embedded and filled with a rubber material and vulcanized,
The molding mold (A) is a lower mold, and protrusions are formed on the left and right inclined surfaces of the depression,
Forming a recess for the projection and fitted to the inclined surface so as to form the same inclined plane as the left and right inclined surfaces of the front Symbol recess to the left or right of the low wear member,
A rubber crawler molding method, wherein a recess of the low-abrasion member is fitted into the protrusion on the inclined surface, and an unvulcanized rubber material is filled into the molding cavity, which is vulcanized.
ゴム突起の左右傾斜面に低摩耗部材の左右傾斜面を合致させた請求項1記載のゴムクローラの成形方法。  The method for molding a rubber crawler according to claim 1, wherein the left and right inclined surfaces of the low wear member are aligned with the left and right inclined surfaces of the rubber protrusions. 低摩耗部材が、6ナイロン、6、6ナイロン、ポリウレタン、ポリアセタール、ポリプロピレン、ポリエチレンから選択される樹脂部材である請求項第1又は2項記載のゴムクローラの成形方法。 The rubber crawler molding method according to claim 1 or 2, wherein the low wear member is a resin member selected from 6 nylon, 6, 6 nylon, polyurethane, polyacetal, polypropylene, and polyethylene . 請求項1〜請求項3の何れか1項に記載のゴムクローラの成形方法を用いて成形されたゴムクローラ。A rubber crawler formed using the method for forming a rubber crawler according to any one of claims 1 to 3.
JP2003099202A 2003-04-02 2003-04-02 Rubber crawler molding method and rubber crawler Expired - Fee Related JP4348106B2 (en)

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