JP3636763B2

JP3636763B2 - Rubber crawler structure with improved derailment performance

Info

Publication number: JP3636763B2
Application number: JP10823395A
Authority: JP
Inventors: 伸二内田
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 1995-04-07
Filing date: 1995-04-07
Publication date: 2005-04-06
Anticipated expiration: 2020-04-06
Also published as: JPH08282551A

Description

【０００１】
【産業上の利用分野】
本発明はゴムクロ−ラの構造に関し、更に詳しくは脱輪性能を改善したゴムクロ−ラの構造に係るものである。
【０００２】
【従来の技術】
近年、ゴムクロ−ラは各種機械の走行部に広く使用されており、通常のゴムクロ−ラは無端状ゴム弾性体中に一定ピッチをもって芯金が埋設されており、これを外囲いしてスチ−ルコ−ドが巻き掛けされている。そしてゴム弾性体の外周側にゴムラグが、内周側には芯金より一対の主角部が突出されており、この主角部をまたいで機体に備えられたいわゆる外転輪が転動するものであり、この両者との係合によってゴムクロ−ラの脱輪防止が図られる。
【０００３】
しかるに、傾斜地走行時、或いは旋回時等にあっては、芯金がゴム弾性体中で横方向に大きくずれることになり、この状態で更に走行を続けると、主角部と外転輪との係合が外れ、いわゆる脱輪の発生が起こりここに走行が不可能となってしまう。特に建設機械や土木作業機械の走行部に供されるゴムクロ−ラは極めて重量が重く、このため脱輪したゴムクロ−ラを元の位置に嵌め直すことは容易ではない。
【０００４】
実開昭５０−９９６２８号公報や特開昭５５−８７６６７号公報には、この脱輪を防止するためのゴムクロ−ラ及び芯金が提案されている。ここに提案されている技術は、芯金に形成した一対の主角部に対しこれよりも更に外側に補助角部を形成し、この角部間に外転輪の輪体が嵌り込んで転動するように設計され、前記したような傾斜地等の走行時の脱輪を防止するものである。
【０００５】
図４に示すものは従来の構造のゴムクロ−ラと外転輪との関係を示すものである。ゴムクロ−ラ１０にあってはゴム弾性体１１中に芯金２０が一定ピッチをもって埋設されており、主として左右の翼部２１、２１がゴム弾性体１１中に埋設され、芯金２０の中央はスプロケットとの係合部２２であり、この係合部２２をはさんで一対の主角部２３、２３を翼部２１、２１に備えたものである。一方、外転輪３０には一対の主角部２３、２３をまたいで輪体３１、３１が形成され、この輪体３１、３１がゴムクロ−ラ１０の内周面上を転動することとなる。
しかるに、傾斜面走行時や小石等に乗り上げた際、図４に示すようにゴムクロ−ラ１０と外転輪３０とは相対的に離反し、このため、図示するように主角部２３と輪体３１との係合が外れ、この状態で走行を続けるとゴムクロ−ラ１０が脱輪してしまう。
【０００６】
このため、前記した既発明にあっては、図５に示すように芯金２０に補助角部２４、２４を形成してゴムクロ−ラ１０の内周面より突出しておき、外転輪２０とゴムクロ−ラ１０との間に相対的に離反して主角部２３、２３と輪体３１との離反が生じた場合でも、輪体３１の外縁部３１０が補助角部２４との係合は外れることなく、このため、外転輪３０と補助角部２４との係合は外れず、脱輪の発生を低減させることとなるのである。
【０００７】
しかるに、図５に示すような既発明にあっては、一般的にこの補助角部の背丈が高いほど外転輪との係合がよくなり脱輪をより防止できることとなるが、特に鍛造で芯金を作る場合には鍛造工程が増加し、コストアップを招くこととなる。又、鋳造で作る場合には製造工程上は問題はないが、芯金の重量の増加は避けることができず、これ又コストアップの要因となる。
従って、ゴムクロ−ラにおける補助角部はなるべく低くかつ小さくすることが求められるが、これが限度を越えて小さくなると外転輪との係合は十分でなく、脱輪性能の低下を招くこととなる。
【０００８】
【発明が解決しようとする課題】
本発明は以上の欠点を解決するものであって、補助角部をできるだけ低くするが、脱輪性能を改善したゴムクロ−ラの構造を提供することを目的とするものである。
【０００９】
【課題を解決するための手段】
本発明は上記目的を達成するためになされたものであって、その要旨は、無端状ゴム弾性体中に一定ピッチをもって埋設された芯金と、この芯金を外囲いしてなる抗張体と、この芯金間に形成したスプロケット係合孔とよりなり、芯金より伸びる一対の主角部とこの主角部の左右外側に芯金より伸びる補助角部が形成されたゴムクロ−ラの構造であって、補助角部と主角部間に存在するゴム弾性体の補助角部の内側の根元に凹み部を形成し、補助角部と主角部間を転動する転輪の輪体とゴムクロ−ラとが相対的に傾いた際、ゴムクロ−ラと接触する側の輪体の外縁部が凹み部内に嵌り込んでなるゴムクロ−ラの構造であって、凹み部は場合によってはゴム弾性体の長手方向に連続するものであってもよい。
【００１０】
【作用】
図５に示す既発明のゴムクロ−ラにあっては、主角部２３と補助角部２４間のゴム１１０は、ゴムクロ−ラの耐久性を確保するために或程度以上は薄くすることはできず、このため補助角部２４の実質的高さＨ０は実際の高さＨよりもゴム１１０の厚さｔ分だけ低いものとなってしまうのが一般的であった。
【００１１】
しかるに、本発明のゴムクロ−ラの構造にあっては、補助角部２４の内側の根元に予め凹み部を形成しておくものである。このため、外転輪３０の輪体３１の外縁部３１０がこの凹み部内に入り込み、この分だけ外転輪３０の位置が実質的に芯金２０に接近することとなり、この分だけ補助角部２４と外転輪３０との係合が深くなり脱輪が防止されることとなるのである。この凹み部は補助角部２４の主角部２３側（内側）の根元に形成するものであって、これが独立した凹み部であっても連続した凹み部であってもよいことは勿論である。又、この凹み部のゴムクロ−ラの幅方向の断面形状は、Ｖ字状、円状、台形状であってもよい。この凹み部の開口幅Ｗは、主角部２３と補助角部２４間の幅Ｗ０の約１／５〜１／２、好ましくは１／４〜１／３程度にすることがよく、この幅Ｗ０を広く取り過ぎるとこの部位のゴム弾性体１１の劣化が促進されてゴムクロ−ラ１０の寿命を縮めることとなってしまう。
【００１２】
【実施例】
以下、本発明を図面をもって更に詳細に説明する。
図１は本発明のゴムクロ−ラ１０の平面図、図２はその幅方向断面図、図３はその一部拡大断面図である。図中、１１はゴムクロ−ラ１０を構成しているゴム弾性体であり、紙面の表裏方向に連続している。１２はゴムラグである。２０はこのゴム弾性体１１中に長手方向に一定ピッチをもって埋設される芯金であって、この芯金２０はゴム弾性体１１中に埋設される左右の翼部２１、２１と、その中央部のスプロケットとの係合部２２と、この係合部２２をはさんで一対の主角部２３、２３が形成されている。そして、この主角部２３、２３の左右側に翼部２１、２１より伸びる補助角部２４、２４が形成され、これら角部２３、２４はゴムクロ−ラ１０の内周面より内側に突出するものである。ゴム弾性体１１はこの角部２３、２４間の内周面を覆うものであり、このゴム弾性体１１０上を外転輪３０が転動することとなる。
【００１３】
本発明は、このゴム弾性体１１０における補助角部２４の内側の根元に連続した凹み部２５を形成したものである。この例では凹み部２５の断面形状はＶ字状としたものである。点線で示した転輪３０は傾斜地等の走行に供された際に外転輪３０の一方が浮き上がってしまった例である。
即ち、図３で特に示すようにゴムクロ−ラ１０の内周面と接触している外転輪３０の外縁部３１０は補助角部２４の内側の根元に形成した凹み部２５に沈み込むように入り込んで係合するものであり、脱輪の低減効果は著しい。
尚、図示はしないが、凹み部２５に対応して芯金２０の翼部２１に凹みを形成することも可能である。図中、２６はスチ−ルコ−ドである。
【００１４】
【発明の効果】
本発明のゴムクロ−ラの構造は、補助角部の内側の根元に凹み部に形成したもので、この凹み部内に外転輪の輪体の外縁部が入り込み、この分だけ外転輪の位置が芯金に接近して補助角部と外転輪との係合が深くなり脱輪が防止される。
【図面の簡単な説明】
【図１】図１は本発明のゴムクロ−ラの平面図である。
【図２】図２は図１のゴムクロ−ラの幅方向断面図である。
【図３】図３は図２の部分拡大断面図である。
【図４】図４は従来のゴムクロ−ラの断面図である。
【図５】図５は実開昭５０−９９６２８号公報等に開示されたゴムクロ−ラの断面図である。
【符号の説明】
１０‥‥ゴムクロ−ラ、
１１‥‥ゴム弾性体、
１１０ ‥‥角部間のゴム弾性体、
１２‥‥ゴムラグ、
２０‥‥芯金、
２１‥‥翼部、
２２‥‥スプロケットの係合孔、
２３‥‥主角部、
２４‥‥補助角部、
２５‥‥凹み部、
２６‥‥スチ−ルコ−ド、
３０‥‥外転輪、
３１‥‥輪体、
３１０ ‥‥輪体の外縁部、
ｔ‥‥ゴム弾性体１１０の厚さ、
Ｈ‥‥補助角部の高さ、
Ｈ０ ‥‥補助角部のゴム内周面からの高さ、
Ｗ‥‥凹み部の幅、
Ｗ０ ‥‥角部間の幅。[0001]
[Industrial application fields]
The present invention relates to the structure of a rubber track, and more particularly to the structure of a rubber track with improved derailment performance.
[0002]
[Prior art]
In recent years, rubber crawlers have been widely used in the running parts of various machines, and ordinary rubber crawlers have a core metal embedded at a constant pitch in an endless rubber elastic body. The cord is wrapped. A rubber lug is projected on the outer peripheral side of the rubber elastic body, and a pair of main corners project from the core on the inner peripheral side, and a so-called outer wheel provided on the machine rolls across the main corner. The rubber crawler can be prevented from coming off by engagement with the both.
[0003]
However, when running on sloping ground or turning, the mandrel will be greatly displaced in the lateral direction in the rubber elastic body, and further running in this state will cause the relationship between the main corner and the outer wheel. A mismatch occurs, so-called derailment occurs and it becomes impossible to travel here. In particular, a rubber crawler used for a traveling part of a construction machine or a civil engineering machine is extremely heavy, and it is not easy to refit the removed rubber crawler in its original position.
[0004]
Japanese Utility Model Laid-Open No. 50-99628 and Japanese Patent Laid-Open No. 55-87667 propose rubber crawlers and metal cores for preventing this wheel removal. The technique proposed here forms an auxiliary corner portion on the outer side of the pair of main corner portions formed on the core metal, and the wheel of an abduction wheel is fitted between the corner portions for rolling. This is designed to prevent wheel disengagement when traveling on sloping ground or the like as described above.
[0005]
FIG. 4 shows the relationship between a rubber crawler having a conventional structure and an outer ring. In the rubber track 10, the core metal 20 is embedded in the rubber elastic body 11 at a constant pitch, and the left and right wing parts 21, 21 are mainly embedded in the rubber elastic body 11. This is an engagement portion 22 with a sprocket, and a pair of main corner portions 23, 23 are provided on the wing portions 21, 21 across the engagement portion 22. On the other hand, the outer ring 30 is formed with ring bodies 31, 31 across the pair of main corner portions 23, 23, and the ring bodies 31, 31 roll on the inner peripheral surface of the rubber track 10. .
However, when running on an inclined surface or riding on a pebble or the like, as shown in FIG. 4, the rubber crawler 10 and the abduction wheel 30 are relatively separated from each other. Therefore, as shown in FIG. If the engagement with 31 is disengaged and the vehicle continues to run in this state, the rubber crawler 10 is removed.
[0006]
For this reason, in the above-described invention, auxiliary corner portions 24, 24 are formed on the cored bar 20 as shown in FIG. 5 so as to protrude from the inner peripheral surface of the rubber crawler 10, and the outer wheel 20 Even when the main corner portions 23 and 23 and the ring body 31 are separated from each other with respect to the rubber track 10, the outer edge portion 310 of the ring body 31 is disengaged from the auxiliary corner portion 24. Therefore, for this reason, the engagement between the outer wheel 30 and the auxiliary corner portion 24 is not released, and the occurrence of wheel removal is reduced.
[0007]
However, in the existing invention as shown in FIG. 5, generally, the higher the height of the auxiliary corner portion, the better the engagement with the abduction wheel and the more the wheel can be prevented from being removed. In the case of making a cored bar, the forging process increases, resulting in an increase in cost. In the case of manufacturing by casting, there is no problem in the manufacturing process, but an increase in the weight of the cored bar cannot be avoided, which also causes an increase in cost.
Therefore, it is required to make the auxiliary corner portion of the rubber crawler as low and small as possible. However, if the auxiliary corner portion becomes smaller than the limit, the engagement with the outer ring is not sufficient, and the wheel removal performance is deteriorated. .
[0008]
[Problems to be solved by the invention]
The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a rubber crawler structure in which the auxiliary corner portion is made as low as possible but the wheel removal performance is improved.
[0009]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above object, and the gist of the present invention is a core bar embedded in an endless rubber elastic body with a constant pitch, and a tensile body surrounding the core bar. And a rubber crawler structure in which a pair of main corner portions extending from the core metal and auxiliary corner portions extending from the core metal are formed on the left and right outer sides of the main corner portion. In addition, a concave portion is formed at the inner base of the auxiliary corner portion of the rubber elastic body existing between the auxiliary corner portion and the main corner portion, and the ring of the wheel and the rubber ring that rolls between the auxiliary corner portion and the main corner portion. The structure of the rubber crawler is such that the outer edge of the ring that comes into contact with the rubber crawler is fitted into the recess when the roller is relatively inclined. It may be continuous in the longitudinal direction.
[0010]
[Action]
In the rubber crawler of the present invention shown in FIG. 5, the rubber 110 between the main corner portion 23 and the auxiliary corner portion 24 cannot be made thinner than a certain degree in order to ensure the durability of the rubber crawler. For this reason, the substantial height H0 of the auxiliary corner 24 is generally lower than the actual height H by the thickness t of the rubber 110.
[0011]
However, in the structure of the rubber track of the present invention, a recess is formed in advance at the root inside the auxiliary corner 24. For this reason, the outer edge portion 310 of the ring body 31 of the outer ring 30 enters the recessed portion, and the position of the outer ring 30 substantially approaches the cored bar 20 by this amount, and the auxiliary corner portion by this amount. As a result, the engagement between the outer ring 24 and the outer rotation wheel 30 is deepened, and the wheel removal is prevented. This dent is formed at the base of the auxiliary corner 24 on the main corner 23 side (inner side), and of course, it may be an independent dent or a continuous dent. Further, the cross-sectional shape in the width direction of the rubber crawler of the recess may be V-shaped, circular, or trapezoidal. The opening width W of the recess is preferably about 1/5 to 1/2, preferably about 1/4 to 1/3 of the width W0 between the main corner portion 23 and the auxiliary corner portion 24, and this width W0. If too much is taken, the deterioration of the rubber elastic body 11 at this portion is promoted and the life of the rubber crawler 10 is shortened.
[0012]
【Example】
Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a plan view of a rubber track 10 according to the present invention, FIG. 2 is a sectional view in the width direction thereof, and FIG. 3 is a partially enlarged sectional view thereof. In the figure, reference numeral 11 denotes a rubber elastic body constituting the rubber track 10, which is continuous in the front and back direction of the paper. Reference numeral 12 denotes a rubber lug. Reference numeral 20 denotes a cored bar embedded in the rubber elastic body 11 with a constant pitch in the longitudinal direction. The cored bar 20 includes left and right wing parts 21 and 21 embedded in the rubber elastic body 11 and a central part thereof. An engagement portion 22 with the sprocket and a pair of main corner portions 23 and 23 are formed across the engagement portion 22. And the auxiliary | assistant corner | angular parts 24 and 24 extended from the wing | blade parts 21 and 21 are formed in the right-and-left side of this main corner | angular parts 23 and 23, and these corner | angular parts 23 and 24 protrude inside from the internal peripheral surface of the rubber crawler 10. It is. The rubber elastic body 11 covers the inner peripheral surface between the corner portions 23 and 24, and the outer roller 30 rolls on the rubber elastic body 110.
[0013]
In the present invention, a concave portion 25 is formed continuously at the inner base of the auxiliary corner portion 24 in the rubber elastic body 110. In this example, the cross-sectional shape of the recess 25 is V-shaped. The wheel 30 shown by a dotted line is an example in which one of the outer wheels 30 has been lifted when it is used for traveling on an inclined ground or the like.
That is, as specifically shown in FIG. 3, the outer edge portion 310 of the abduction wheel 30 that is in contact with the inner peripheral surface of the rubber track 10 sinks into a recessed portion 25 formed at the base inside the auxiliary corner portion 24. Since it enters and engages, the effect of reducing wheel removal is remarkable.
Although not shown, it is possible to form a dent in the wing portion 21 of the cored bar 20 corresponding to the dent portion 25. In the figure, 26 is a steel code.
[0014]
【The invention's effect】
The structure of the rubber crawler of the present invention is formed in a recessed portion at the inner base of the auxiliary corner portion, and the outer edge portion of the outer ring of the outer ring enters into the recessed portion, and the position of the outer wheel is accordingly increased. However, as the metal bar approaches the core bar, the engagement between the auxiliary corner portion and the outer ring is deepened to prevent the wheel from being removed.
[Brief description of the drawings]
FIG. 1 is a plan view of a rubber track of the present invention.
2 is a cross-sectional view in the width direction of the rubber track of FIG.
FIG. 3 is a partially enlarged sectional view of FIG.
FIG. 4 is a cross-sectional view of a conventional rubber track.
FIG. 5 is a cross-sectional view of a rubber crawler disclosed in Japanese Utility Model Laid-Open No. 50-99628.
[Explanation of symbols]
10 ... Rubber Crawler,
11. Rubber elastic body,
110 ... rubber elastic body between corners,
12 ... Rubber lugs,
20 ... Core metal,
21 ... Wings,
22 ... Sprocket engagement hole,
23 ... main corner,
24 ... Auxiliary corners,
25 .....
26 ... Steel code,
30 ... Abduction wheel,
31 ... Ring body,
310 ... the outer edge of the ring,
t ... the thickness of the rubber elastic body 110,
H ... height of auxiliary corner,
H0 ... the height of the auxiliary corner from the inner peripheral surface of the rubber,
W ... the width of the recess,
W0 ...... Width between corners.

Claims

An endless rubber elastic body is composed of a core metal embedded at a constant pitch, a tensile body that surrounds the core metal, and a sprocket engagement hole formed between the core bars, and extends from the core metal. A rubber crawler structure in which a pair of main corners and auxiliary corners extending from the metal core on the left and right outer sides of the main corners are formed, and the auxiliary corners of the rubber elastic body existing between the auxiliary corners and the main corners. A concave portion is formed at the inner root, and when the ring of the rolling wheel that rolls between the auxiliary corner and the main corner and the rubber crawler are relatively inclined, the ring on the side that contacts the rubber crawler A rubber crawler structure with improved derailment performance, characterized in that an outer edge portion is fitted in a recess.

2. The rubber crawler structure with improved wheel removal performance according to claim 1, wherein the recess is continuous in the longitudinal direction of the rubber elastic body.