JP3432925B2 - Rubber Crawler Structure - Google Patents
Rubber Crawler StructureInfo
- Publication number
- JP3432925B2 JP3432925B2 JP30024694A JP30024694A JP3432925B2 JP 3432925 B2 JP3432925 B2 JP 3432925B2 JP 30024694 A JP30024694 A JP 30024694A JP 30024694 A JP30024694 A JP 30024694A JP 3432925 B2 JP3432925 B2 JP 3432925B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- ridge
- elastic body
- thickness
- crawler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明はゴムクロ−ラの構造に関
し、更に詳しくはゴムクロ−ラを構成するゴム弾性体の
左右幅端部（以下、単に「ゴム弾性体の左右幅端部」と
いう）にゴム突条を有するゴムクロ−ラの構造に係る。
【０００２】
【従来の技術】ゴムクロ−ラは、近年に至り農機具の走
行部を始めとして建設機械や土木作業機械の走行部に広
く用いられるようになった。このため、ゴムクロ−ラの
使用条件は次第に厳しくなり、特に建設機械や土木作業
機械の走行部に用いられる場合には、ゴム弾性体の左右
幅端部が道路の縁石や岩石、鉱石等に擦れ易く、このた
め、ゴム弾性体の左右幅端部からの亀裂やゴム欠けの現
象が発生している。しかるに、ゴムに亀裂等が発生した
場合には、砂や小石が亀裂内に侵入して更にゴム弾性体
の傷を深めることになり、一方、この亀裂部位より水分
が侵入し、これによってゴム中に埋設されているスチ−
ルコ−ドや芯金に錆が発生し、これがため、ゴム剥離や
芯金の脱落が発生してゴムクロ−ラの寿命が極端に短く
なるという事態が発生していた。
【０００３】特に、最近になってゴムクロ−ラの捩れの
発生を防止するために引張補強材であるスチ−ルコ−ド
以外に、ゴム弾性体の左右幅端部近くにもバイアスコ−
ド層が埋設されるようになってきたため、かかるゴム弾
性体の左右幅端部の亀裂から侵入する水分に起因する欠
点が多く見られるようになってきた。
【０００４】
【発明が解決しようとする課題】本発明は、ゴムクロ−
ラが走行に供される際、岩石等との擦れによって生じる
ゴム弾性体の左右幅端部の亀裂やゴム欠けの発生を防止
した新しいゴムクロ−ラを提供することを目的としてい
る。
【０００５】
【課題解決するための手段】本発明の構成は、無端状の
ゴム弾性体１１と、このゴム弾性体１１の長手方向に埋
設されたスチ−ルコ−ド１３と、ゴム弾性体１１の外周
表面にゴムラグ１５を備えたゴムクロ−ラであって、当
該ゴム弾性体１１の左右幅端部１１ａに長手方向に向か
って一本のゴム突条１０を形成し、かかるゴム突条１０
の基底部より先端部を先細としたことを特徴とするゴム
クロ−ラの構造である。そして、更に言えば、ゴム突条
１０の基底部の厚さｔとゴムクロ−ラの厚さＴとがＴ／
４≦ｔ≦Ｔ／２、ゴム突条１０の基底部の厚さｔとゴム
突起の高さｈとがｈ≧ｔであるゴムクロ−ラの構造を提
供するものである。
【０００６】
【作用】本発明においては、ゴム弾性体の左右幅端部に
或る程度の剛性と弾力性を兼ね備えたゴム突条を形成し
たものであり、このゴム突条の存在により岩石等との接
触に当たっても、その弾力性によって衝突時の衝撃を緩
和したもので、更には、剛性力の付加によってゴムクロ
−ラ自体に捩れや極部的な折れ曲りを防止したものであ
る。従って、かかるゴム突条の存在はゴムクロ−ラに対
してゴム弾性体の左右幅端部からの傷の発生を低減させ
る効果をもたらし、ゴムクロ−ラの耐久性を向上させる
こととなったものである。
【０００７】この発明を具現化するゴムクロ−ラは、ゴ
ム弾性体中にスチ−ルコ−ドが埋設される以外、芯金の
埋設の有無は問わない。そして、芯金が埋設されないタ
イプのゴムクロ−ラは、スチ−ルコ−ドがゴムクロ−ラ
の幅方向のほぼ全域に、即ちゴム弾性体の左右幅端部の
極く近くにまでスチ−ルコ−ドが埋設されることとな
り、これは前記したように、左右幅端部の亀裂によって
悪影響がもたらされるが、本発明はこのような構造のゴ
ムクロ−ラに特に効果的である。
【０００８】本発明のゴム突条は、ゴムクロ−ラを構成
するゴム弾性体に一体とされる基底部よりも先端部側を
先細としたものであるが、ここでゴム突条について更に
言及する。図８は本発明のゴムクロ−ラのゴム突条１０
近傍の断面図である。ここでゴムクロ−ラを構成するゴ
ム弾性体の左右幅端部の厚さをＴ、ゴム突条１０の基底
部の厚さをｔ、ゴム突条１０の高さをｈとすると、ゴム
突条１０の基底部の厚さｔがゴム弾性体の厚さＴに近づ
くにつれて、このゴム突条１０はゴムクロ−ラの一部
（左右幅端部）として考えられるようになってしまい、
本発明で目指したゴム突条１０の特別な効果を奏さなく
なる。
【０００９】本発明者等の実験によれば、ゴム突条１０
の基底部の厚さｔとゴムクロ−ラの左右幅端部の厚さＴ
とが、Ｔ／４≦ｔ≦Ｔ／２の寸法のゴム突条が望まし
い。又、ゴム突条１０の高さｈも小さくなるにつれて効
果が小さくなり、ゴム突条１０の高さｈとゴム突条１０
の基底部の厚さｔとは、ｈ≧ｔの範囲が望ましいことが
分った。
【００１０】このゴム突条１０を形成するには、ゴムク
ロ−ラを加硫成型するに際して用いる上下モ−ルドの合
せ面を工夫すればよい。ここで上下モ−ルドの断面を図
９に示す。通常はゴムクロ−ラの内周面を形成するキャ
ビテイａを有するモ−ルドを下モ−ルド１とし、ゴムラ
グを形成するモ−ルドを上モ−ルド２とする。そしてキ
ャビテイａ内に、ゴムクロ−ラの内周側ゴムＡ、要すれ
ば芯金Ｂ、そしてスチ−ルコ−ドＣ列を囲むトリ−トゴ
ム、外周側ゴムＤの順に重ね、上下モ−ルド１、２を加
圧加熱してゴムクロ−ラを得るものである。
【００１１】さて、この上下モ−ルド１、２の合せ部に
あって、面取り部Ｐ、Ｐを形成し、その分、ゴム突条が
形成されることとなる。この面取り部Ｐの構造にあって
は、面取り部の長さＬは１〜１０ｍｍ程度、面取り角度
θを３０〜６０度程度とするのがよい。
【００１２】勿論、この面取り部の構造に限定されない
ことは当然であるが、ゴム突条の断面形状を上記のよう
に限定したものにあっては、ゴム突条の弾力性と剛性が
適度にあり、ゴムクロ−ラを構成するゴム弾性体の左右
の幅端部が岩石等と衝突してもゴム突条がむしられるこ
とが生じ難く、かつ、ゴムクロ−ラの左右幅端部の保護
効果がすぐれているものである。
【００１３】
【実施例】以下、図面をもって本発明のゴムクロ−ラを
更に説明する。図１は、本発明におけるゴム突条１０を
備えたゴムクロ−ラの一部切断斜視図、図２はそのゴム
突条１０近傍の拡大図である。図中、１１はゴムクロ−
ラの基体を構成するゴム弾性体であり、１２は芯金、１
３はスチ−ルコ−ド、１４はゴムクロ−ラの捩れ防止の
ためにゴム中に埋設されたバイアスコ−ド、１５はゴム
ラグである。
【００１４】そして、ゴム弾性体１１の左右幅端部１１
ａに断面台形のゴム突条１０が形成されており、ゴム突
条１０の基底部の厚さｔはゴムクロ−ラの左右幅端部１
１ａの厚さＴの約１／３、ゴム突条１０の高さｈは寸法
ｔと略同じであり、その先端部の厚さｔ0 は寸法ｔの略
１／２である。
【００１５】図３〜図５は本発明のゴムクロ−ラにおけ
る各種ゴム突条１０近傍の断面図を示すものである。こ
れらはいずれも上下モ−ルド１、２の合せ面に形成され
た面取り部Ｐの形状によって種々の断面のゴム突条が得
られることとなる。
【００１６】図３のゴム突条１０にあっては、その断面
形状が三角形状となっており、前記したモ−ルド１、２
にて示した面取り部Ｐの形状によって得られる。図４の
ゴム突条１０は断面形状が逆曲面形状で略三角形状とし
たもの、図５のゴム突条１０の基底部近傍は逆曲面形状
であり、先端部が台形状のものである。これらは、いず
れも面取り部の形状の違いによってこれらのゴム突条１
０が得られるものであって、前記のゴム形状の寸法範囲
内にあれば、いずれも所期の効果をもたらすものとな
る。
【００１７】ここで図５に示すゴム突条１０の有無につ
いてゴムクロ−ラの左右幅端部の亀裂乃至ゴム欠けが発
生するまでの時間について効果度数を測定した。即ち、
図６はゴム突条１０の基底部の厚さｔとゴムクロ−ラの
左右幅端部１１ａの厚さＴとの関係と効果度数との関
係、図７はゴム突条１０の高さｈと基底部の厚さｔとの
関係と効果度数との関係を示すグラフである。
【００１８】
【発明の効果】図６及び図７に示すように、本発明のゴ
ムクロ−ラが走行に供される際、岩石等との擦れによっ
て生じるゴム弾性体の左右幅端部の亀裂やゴム欠けの発
生をゴム突条を形成することによって防止するものであ
り、図６にあっては、ゴム突条１０の基底部の厚さｔは
ゴム弾性体の左右幅端部の厚さＴの略１／４〜１／２程
度とするのが好ましいことが判明し、図７にあっては、
ゴム突条１０の高さｈはゴム突条の厚さｔよりも大であ
ることが望ましいことが分る。尚、効果度数はゴム突条
１０のある本発明のゴムクロ−ラが、ゴム突条１０のな
いゴムクロ−ラに対して耐久時間（耐久回数）が何倍あ
るかを示す指数である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a rubber crawler, and more particularly, to the right and left end portions (hereinafter simply referred to as "rubber") of a rubber elastic body constituting a rubber crawler. (Referred to as left and right end portions of the elastic body)). 2. Description of the Related Art In recent years, rubber crawlers have been widely used for running parts of agricultural machines, construction machines and civil engineering machines. For this reason, the usage conditions of rubber crawlers become increasingly severe, and particularly when used in the traveling parts of construction machines and civil engineering machines, the left and right ends of the rubber elastic body rub against curbs, rocks, ores, etc. of roads. Therefore, cracks and chipping of the rubber from the left and right end portions of the rubber elastic body occur. However, if a crack or the like occurs in the rubber, sand or pebbles will penetrate into the crack and further deepen the damage of the rubber elastic body. Steel buried in
Rust was generated on the cord and the core metal, and as a result, the rubber peeled off and the core metal fell off, and the life of the rubber crawler was extremely shortened. In particular, recently, in order to prevent the occurrence of twisting of a rubber crawler, a bias cord is provided near the left and right ends of a rubber elastic body in addition to a steel cord which is a tensile reinforcing material.
Since the rubber layer has been buried, many defects caused by moisture entering through cracks at the left and right width ends of the rubber elastic body have come to be seen. [0004] The present invention relates to a rubber cloth.
It is an object of the present invention to provide a new rubber crawler in which a rubber elastic body is prevented from cracking or chipping at the left and right width ends of the rubber elastic body caused by friction with rocks or the like when the rubber is run. According to the present invention, an endless rubber elastic body 11, a steel cord 13 buried in the longitudinal direction of the rubber elastic body 11, and a rubber elastic body 11 are provided. A rubber crawler having a rubber lug 15 on the outer peripheral surface of the rubber elastic body 11, wherein a single rubber protrusion 10 is formed in the left and right width end portions 11 a of the rubber elastic body 11 in the longitudinal direction.
The rubber crawler is characterized in that the tip is tapered from the base. More specifically, the thickness t of the base of the rubber ridge 10 and the thickness T of the rubber crawler are T / T.
4 ≦ t ≦ T / 2, and a rubber chopper structure in which the thickness t of the base of the rubber ridge 10 and the height h of the rubber projection satisfy h ≧ t. In the present invention, a rubber ridge having both a certain degree of rigidity and elasticity is formed at the left and right width end portions of the rubber elastic body. Even if it comes in contact with the rubber, the impact at the time of collision is reduced by its elasticity, and furthermore, the addition of rigidity prevents the rubber crawler itself from being twisted or bent extremely. Therefore, the presence of the rubber ridge has the effect of reducing the occurrence of scratches from the left and right width ends of the rubber elastic body with respect to the rubber crawler, thereby improving the durability of the rubber crawler. is there. [0007] The rubber chopper embodying the present invention does not matter whether or not a core metal is embedded, except that a steel cord is embedded in a rubber elastic body. The rubber cord of the type in which the core metal is not embedded is such that the steel cord covers almost the entire area in the width direction of the rubber collar, that is, as close as possible to the right and left ends of the rubber elastic body. However, as described above, this is adversely affected by the cracks at the left and right end portions, but the present invention is particularly effective for a rubber crawler having such a structure. [0008] The rubber ridge of the present invention has a tapered tip side than a base portion integrated with a rubber elastic body constituting a rubber crawler. The rubber ridge will be further described here. . FIG. 8 shows a rubber ridge 10 of the rubber crawler of the present invention.
It is sectional drawing of a vicinity. Here, assuming that the thickness of the right and left ends of the rubber elastic body constituting the rubber crawler is T, the thickness of the base of the rubber ridge 10 is t, and the height of the rubber ridge 10 is h, the rubber ridge is provided. As the thickness t of the base portion of the rubber 10 approaches the thickness T of the rubber elastic body, the rubber ridges 10 can be considered as a part of the rubber crawler (left and right width ends),
The special effect of the rubber ridge 10 aimed at by the present invention is not exhibited. According to the experiments of the present inventors, the rubber ridge 10
Thickness t at the bottom of the rubber cuff and thickness T at the right and left ends of the rubber crawler.
However, a rubber ridge having a dimension of T / 4 ≦ t ≦ T / 2 is desirable. Further, the effect becomes smaller as the height h of the rubber ridge 10 becomes smaller, and the height h of the rubber ridge 10 and the height h of the rubber ridge 10 become smaller.
It has been found that the thickness t of the base portion is preferably in the range of h ≧ t. In order to form the rubber ridge 10, the upper and lower molds used for vulcanizing and molding the rubber crawler may be modified. FIG. 9 shows a cross section of the upper and lower molds. Normally, the mold having the cavity a forming the inner peripheral surface of the rubber crawler is referred to as a lower mold 1, and the mold forming the rubber lug is referred to as an upper mold 2. Then, in the cavity a, the inner peripheral rubber A of the rubber crawler, the core metal B if necessary, the triat rubber surrounding the steel cord C row, and the outer peripheral rubber D are stacked in this order. And 2 are pressurized and heated to obtain a rubber crawler. The chamfers P, P are formed at the joint of the upper and lower molds 1, 2, and a rubber ridge is formed accordingly. In the structure of the chamfered portion P, the length L of the chamfered portion is preferably about 1 to 10 mm, and the chamfering angle θ is preferably about 30 to 60 degrees. Of course, it is not limited to the structure of the chamfered portion. However, in the case where the cross-sectional shape of the rubber ridge is limited as described above, the elasticity and rigidity of the rubber ridge are appropriately adjusted. Yes, even if the left and right width ends of the rubber elastic body constituting the rubber crawler collide with rocks, etc., it is difficult for the rubber ridge to be peeled off, and the protection effect of the left and right width ends of the rubber crawler is reduced. It is excellent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rubber roller according to the present invention. FIG. 1 is a partially cutaway perspective view of a rubber crawler provided with a rubber ridge 10 according to the present invention, and FIG. 2 is an enlarged view of the vicinity of the rubber ridge 10. In the figure, 11 is a rubber cloth.
A rubber elastic body constituting a base of the rubber;
Reference numeral 3 denotes a steel cord, 14 denotes a bias code buried in rubber to prevent twisting of the rubber crawler, and 15 denotes a rubber lug. The left and right width end portions 11 of the rubber elastic body 11
A rubber ridge 10 having a trapezoidal cross section is formed at a, and the thickness t of the base of the rubber ridge 10 is equal to the left and right width ends 1 of the rubber crawler.
The thickness T of the rubber ridge 10 is approximately the same as the dimension t, and the thickness t 0 of the tip portion is approximately の of the dimension t. FIGS. 3 to 5 are sectional views showing the vicinity of various rubber ridges 10 in the rubber crawler of the present invention. In any case, rubber ridges having various cross sections can be obtained depending on the shape of the chamfered portion P formed on the mating surface of the upper and lower molds 1 and 2. The rubber ridge 10 shown in FIG. 3 has a triangular cross-sectional shape.
Are obtained by the shape of the chamfered portion P indicated by. The rubber ridge 10 shown in FIG. 4 has a substantially triangular cross-sectional shape with an inverted curved surface. The vicinity of the base of the rubber ridge 10 shown in FIG. 5 has an inverted curved shape, and the tip has a trapezoidal shape. Each of these rubber ridges 1 depends on the shape of the chamfered part.
0 is obtained, and if the value is within the above-mentioned size range of the rubber shape, the desired effects are obtained. Here, with respect to the presence or absence of the rubber ridges 10 shown in FIG. 5, the effect frequency was measured with respect to the time until cracking or chipping of the rubber at the left and right width ends of the rubber crawler. That is,
FIG. 6 shows the relationship between the thickness t of the base of the rubber ridge 10 and the thickness T of the left and right width end portions 11a of the rubber crawler and the effect frequency, and FIG. 7 shows the relationship between the height h of the rubber ridge 10 and the height h. It is a graph which shows the relationship between the thickness t of a base part, and the effect frequency. As shown in FIGS. 6 and 7, when the rubber crawler of the present invention is used for traveling, cracks at the left and right width ends of the rubber elastic body caused by friction with rocks or the like are caused. The formation of the rubber chip is prevented by forming a rubber ridge. In FIG. 6, the thickness t of the base of the rubber ridge 10 is equal to the thickness T of the right and left ends of the rubber elastic body. It has been found that it is preferable to set it to about ４ to の of FIG.
It is understood that the height h of the rubber ridge 10 is desirably larger than the thickness t of the rubber ridge. The effect frequency is an index indicating how many times the durability time (the number of times of durability) of the rubber crawler of the present invention having the rubber protrusion 10 is greater than that of the rubber crawler having no rubber protrusion 10.
【図面の簡単な説明】
【図１】図１は本発明におけるゴム突条の第１例を備え
たゴムクロ−ラの一部切断斜視図である。
【図２】図２は図１におけるゴム突条近傍の拡大図であ
る。
【図３】図３は本発明におけるゴム突条の第２例を示す
断面図である。
【図４】図４は本発明におけるゴム突条の第３例を示す
断面図である。
【図５】図５は本発明におけるゴム突条の第４例を示す
断面図である。
【図６】図６は図５に示すゴム突条の基底部の厚さとゴ
ムクロ−ラの厚さとの関係と、効果度数との関係を示す
グラフである。
【図７】図７は図５に示すゴム突条の高さと基底部の厚
さとの関係と、効果度数との関係を示すグラフである。
【図８】図８は本発明のゴム突条の一例における近傍の
断面図である。
【図９】図９は本発明のゴムクロ−ラを製造する際の上
下モ−ルドの断面図である。
【符号の説明】
１１‥‥ゴム弾性体、１１ａ‥‥ゴム弾性体の左右幅端
部、１２‥‥芯金、１３‥‥スチ−ルコ−ド、１４‥‥
バイアスコ−ド、１５‥‥ゴムラグ、１０‥‥ゴム突
条、ｔ‥‥ゴム突条の基底部の厚さ、ｔ0 ‥‥ゴム突条
の先端部の厚さ、ｈ‥‥ゴム突条の高さ、Ｔ‥‥ゴムク
ロ−ラの左右幅端部の厚さ。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view of a rubber crawler provided with a first example of a rubber ridge in the present invention. FIG. 2 is an enlarged view of the vicinity of a rubber ridge in FIG. FIG. 3 is a cross-sectional view showing a second example of the rubber ridge in the present invention. FIG. 4 is a sectional view showing a third example of a rubber ridge in the present invention. FIG. 5 is a sectional view showing a fourth example of the rubber ridge in the present invention. 6 is a graph showing the relationship between the thickness of the base of the rubber ridge shown in FIG. 5 and the thickness of the rubber crawler, and the relationship between the effect frequency. FIG. 7 is a graph showing the relationship between the height of the rubber ridge and the thickness of the base shown in FIG. 5 and the relationship with the degree of effect. FIG. 8 is a sectional view of the vicinity of an example of the rubber protrusion of the present invention. FIG. 9 is a cross-sectional view of the upper and lower molds when manufacturing the rubber roller of the present invention. [Description of Signs] 11 rubber elastic body, 11a１１ left and right width end portions of rubber elastic body, 12 ‥‥ core bar, 13 ‥‥ steel code, 14 ‥‥
Bias code, 15 ‥‥ rubber lug, 10 ‥‥ rubber ridge, t ‥‥ thickness of base of rubber ridge, t 0先端 thickness of tip of rubber ridge, h ‥‥ thickness of rubber ridge Height, T ‥‥ The thickness of the right and left ends of the rubber crawler.
Claims (1)
性体１１の長手方向に埋設されたスチ−ルコ−ド１３
と、ゴム弾性体１１の外周表面にゴムラグ１５を備えた
ゴムクロ−ラであって、当該ゴム弾性体１１の左右幅端
部１１ａに長手方向に向かって一本のゴム突条１０を形
成し、かかるゴム突条１０の基底部より先端部を先細と
なし、ゴム突条１０の基底部の厚さｔとゴムクロ−ラの
左右幅端部の厚さＴとがＴ／４≦ｔ≦Ｔ／２、ゴム突条
１０の基底部の厚さｔとゴム突起の高さｈとがｈ≧ｔな
る関係を有することを特徴とするゴムクロ−ラの構造。(57) Claims 1. An endless rubber elastic body 11 and a steel cord 13 embedded in the rubber elastic body 11 in the longitudinal direction.
And a rubber crawler provided with a rubber lug 15 on the outer peripheral surface of the rubber elastic body 11, wherein one rubber ridge 10 is formed in the left and right width end portions 11 a of the rubber elastic body 11 in the longitudinal direction, The tip of the rubber ridge 10 is tapered from the base, and the thickness t of the base of the rubber ridge 10 and the thickness T of the right and left ends of the rubber crawler are T / 4 ≦ t ≦ T / 2. The structure of the rubber crawler, wherein the thickness t of the base of the rubber protrusion 10 and the height h of the rubber protrusion have a relationship of h ≧ t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30024694A JP3432925B2 (en) | 1994-11-09 | 1994-11-09 | Rubber Crawler Structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30024694A JP3432925B2 (en) | 1994-11-09 | 1994-11-09 | Rubber Crawler Structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08133145A JPH08133145A (en) | 1996-05-28 |
| JP3432925B2 true JP3432925B2 (en) | 2003-08-04 |
Family
ID=17882475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30024694A Expired - Fee Related JP3432925B2 (en) | 1994-11-09 | 1994-11-09 | Rubber Crawler Structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3432925B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5577432B2 (en) * | 2013-06-14 | 2014-08-20 | 株式会社ブリヂストン | Rubber crawler manufacturing method |
-
1994
- 1994-11-09 JP JP30024694A patent/JP3432925B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08133145A (en) | 1996-05-28 |
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