JP2004098898A

JP2004098898A - Elastic crawler

Info

Publication number: JP2004098898A
Application number: JP2002264618A
Authority: JP
Inventors: Yoshiro Ueno; 上野　▲吉▼郎
Original assignee: Sumitomo Rubber Industries Ltd
Current assignee: Sumitomo Rubber Industries Ltd
Priority date: 2002-09-10
Filing date: 2002-09-10
Publication date: 2004-04-02
Anticipated expiration: 2022-09-10
Also published as: JP4153270B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic crawler having a lug pattern for developing good soil discharging performance and good tractional performance. <P>SOLUTION: The elastic crawler 1 comprises a crawler body 2 formed of a rubber elastic body into an endless band and adapted to be rotationally driven in a peripheral direction A and lugs 9A, 9B provided on the outer periphery side of the crawler body 2 and constituted by a crawler center lug portion 10 located on the side of a central portion of the crawler body 2 in a cross direction B and a crawler side lug portion 11 located on the side of a side portion of the crawler body 2 in the cross direction B. The crawler center lug portion 10 is formed in a mountain shape protruded at the front side of the crawler 1 in a rotating direction A1 and the crawler side lug portion 11 is formed in a curved shape protruded at the rear side of the crawler 1 in the rotating direction A1. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、クローラ式走行装置に採用される弾性履帯に関するものである。
【０００２】
【従来の技術】
従来、雪上車やコンバイン等の走行部に採用される走行装置として、駆動輪とアイドラ等とに亘って履帯を掛装し、この履帯を周方向に回転させることにより走行するようにしたクローラ式走行装置がある。
このクローラ式走行装置の履帯として、ゴム様弾性体によって無端帯状に形成された履帯本体を備えると共に、この履帯本体の外周側にラグを備えた弾性履帯がある。
【０００３】
この弾性履帯のラグとして、履帯の幅方向中央部に位置していて、履帯周方向一方側に凸となる中央ラグ部と、この中央ラグ部の履帯幅方向両側から、履帯幅方向端部に至るに従って履帯周方向他方側に移行する傾斜方向に延びる左右一対の側部ラグ部とから、全体として履帯周方向一方側に凸となる山形状に構成されているラグがある（例えば、特許文献１参照）。
【０００４】
【特許文献１】
特開平３−４２３８３号公報（第１図）。
【０００５】
【発明が解決しようとする課題】
前記従来のラグにあっては、全体として履帯周方向一方側に凸となる山形状に形成されているので、履帯を周方向一方側に回転させると、排土性に優れているものの、軟弱地や雪路等における牽引力に劣るという問題がある。
本発明は、前記問題点に鑑みて、良好な排土性と、良好な牽引性能とを有するラグパターンを備えた弾性履帯を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明が技術的課題を解決するために講じた技術的手段は、ゴム様弾性体によって無端帯状に形成され、周方向Ａに回転駆動される履帯本体２を備え、この履帯本体２の外周側に、履帯本体２の幅方向Ｂ中央側に位置する履帯中央側ラグ部１０と、履帯本体２の幅方向Ｂ側部に位置する履帯側部側ラグ部１１とを備え、履帯中央側ラグ部１０は、履帯１の回転方向Ａ１前方側に凸となる山形状に形成され、履帯側部側ラグ部１１は、履帯１の回転方向Ａ１後方側に凸となる湾曲状に形成されていることを特徴とする。
【０００７】
また、履帯中央側ラグ部１０及び履帯側部側ラグ部１１は、履帯本体２の周方向Ａに亘って間隔をおいて設けられ、履帯側部側ラグ部１１の履帯周方向ＡのピッチＰ２は、履帯中央側ラグ部１０の履帯周方向ＡのピッチＰ１の２倍以上とされているのがよい。
また、履帯側部側ラグ部１１が、履帯中央側ラグ部１０の履帯幅方向Ｂ両端部の内、一方からのみ連続状に延出されて形成されているラグ９Ａ，９Ｂを有するのがよい。
【０００８】
また、履帯側部側ラグ部１１が履帯中央側ラグ部１０に連続状に設けられており、履帯側部側ラグ部１１の履帯幅方向Ｂの外端側の履帯回転方向Ａ１先端側が、履帯中央側ラグ部１０の履帯回転方向Ａ１先端よりも、履帯回転方向Ａ１後方側に位置しているのがよい。
また、履帯中央側ラグ部１０が、転輪通過面１５に対応して位置しているのがよい。
また、履帯中央側ラグ部１０及び履帯側部側ラグ部１１の履帯回転方向Ａ１の前側の面１０ａ，１１ａは、履帯外周側に向かうに従って履帯回転方向Ａ１後方に移行する傾斜面とされており、履帯側部側ラグ部１１の履帯回転方向Ａ１の前側の面１１ａの履帯周方向Ａに対する傾斜が、履帯中央側ラグ部１０の履帯回転方向Ａ１の前側の面１０ａの履帯周方向に対する傾斜よりも、緩やかに形成されているのがよい。
【０００９】
また、中央側ラグ部１０は履帯回転方向Ａ１前方側に凸となる円弧状に形成され、側部側ラグ部１１は履帯回転方向Ａ１後方側凸となる円弧状に形成されていて、中央側ラグ部１０の曲率半径は、側部側ラグ部１１の曲率半径よりも小である
また、履帯側部側ラグ部１１のラグ高さＨが、履帯中央側ラグ部１０のラグ高さＨよりも高いのがよい。
また、履帯中央側ラグ部１０の履帯幅方向Ｂ一側にのみ履帯側部側ラグ部１１を連続状に備えたラグ９Ａと、履帯中央側ラグ部１０の履帯幅方向Ｂ他側にのみ履帯側部側ラグ部１１を連続状に備えたラグ９Ｂとが履帯周方向Ａに交互に配置されているのがよい。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
図１〜４は、本発明の一実施の形態を示しており、１は、クローラ式走行装置に採用される弾性履帯（以下、単に履帯という）である。
クローラ式走行装置は、例えば、進行方向前後一側に配置された駆動輪（駆動スプロケット）と、進行方向前後他側に配置されたアイドラと、これら駆動輪とアイドラとの間に配置された複数の転輪と、これら駆動輪、アイドラ、複数の転輪に亘って巻き掛けられた無端帯状の履帯１とを有し、駆動輪から履帯１に駆動力を伝達して、該履帯１を周方向Ａに回転（循環回走）させることにより、走行するように構成され、通常、走行体の本機に対して左右一対設けられる。
【００１１】
履帯１は、ゴム様弾性体から無端帯状に形成された履帯本体２を有し、この履帯本体２内には、抗張体３と補強層４とが履帯周方向Ａ全周に亘って埋設されている。
抗張体３は、例えば、履帯本体２内に、周方向Ａに沿って１周巻回状として埋設された有端のスチールコード等の抗張力コード６を、履帯幅方向Ｂ（左右方向）に適宜間隔をおいて、並列状に配設されて構成されており、駆動輪から伝達された駆動力を履帯１の他の部分に伝達すると共に、履帯１に加えられる履帯周方向Ａの張力に耐える機能を該履帯１に持たせるために履帯本体２に埋設される。
【００１２】
補強層４は、外傷から抗張体３を保護すると共に、履帯１の捩り、横剛性を向上させて履帯外れを防止する機能を持つキャンバス等によって構成されている。前記履帯本体２の内周側には、駆動輪から履帯本体２へ駆動力を伝達するためのゴム様弾性体からなる駆動突起７が履帯周方向Ａに亘って設けられており、この駆動突起７は、履帯本体２の幅方向Ｂの中央部に、履帯周方向Ａに間隔をおいて且つ一体的に設けられている。
また、履帯本体２の外周側には、抗張体３及び補強層４の保護、牽引力の伝達、入力振動の低減等の機能を持つラグ９Ａ，９Ｂを、履帯周方向Ａに亘って且つ履帯周方向Ａに間隔をおいて有する。
【００１３】
このラグ９Ａ，９Ｂは、ゴム様弾性体によって構成され、履帯本体２に接続する基部側から接地面１４に向かうに従って、漸次狭幅となる断面台形状に形成されており、履帯本体２の幅方向Ｂ中央側に位置する履帯中央側ラグ部１０と、この履帯中央側ラグ部１０と連続的に形成されていて履帯本体２の幅方向Ｂ側部に位置する履帯側部側ラグ部１１とを備えている。
履帯中央側ラグ部１０は、履帯１の回転方向Ａ１（前進回転方向）前方側に凸となる山形状に形成され、履帯側部側ラグ部１１は、履帯１の回転方向Ａ１後方側に凸となる湾曲状（円弧状）に形成されている。
【００１４】
すなわち、山形状の履帯中央側ラグ部１０は、履帯回転方向Ａ１の先端側部分である頂部１２と、この頂部１２の左右両側から、左右方向外方に向かうに従って回転方向Ａ１後方に移行する傾斜方向に延びる傾斜状の斜部１３とを備えており、この履帯中央側ラグ部１０の左右斜部１３のいずれか一方から履帯側部側ラグ部１１が履帯１の回転方向Ａ１後方側に凸となる湾曲状となるように一体的に延出されている（ラグ９Ａ，９Ｂの履帯幅方向Ｂ一端側は、履帯本体２の幅方向Ｂ端部（又はその近傍）にまで延び、ラグ９Ａ，９Ｂの履帯幅方向Ｂ他端側は、履帯本体２の幅方向Ｂ中央部をわずかに越えて、後述する転輪通過面１５に対応する位置（転輪通過面１５の投影域）で終る形状とされている）。
【００１５】
前記構成のラグ９Ａ，９Ｂにあっては、履帯本体２の幅方向Ｂ中央側に位置する履帯中央側ラグ部１０は、履帯１の回転方向Ａ１前方側に凸となる山形状に形成されていることにより、走行時の排土性が良好となり、履帯本体２の幅方向Ｂ側部に位置する履帯側部側ラグ１１は、履帯１の回転方向Ａ１後方側に凸となる湾曲状となるように履帯中央側ラグ部１０の左右斜部１３の一方から一体的に延出されているので、良好な牽引性能が得られる。
また、履帯中央側ラグ部１０及び履帯側部側ラグ部１１の履帯回転方向Ａ１前後の面は、履帯本体２から接地面１４に至るに従って、履帯回転方向Ａ１の前後間隔が漸次狭くなる傾斜面に形成され（したがって、履帯中央側ラグ部１０及び履帯側部側ラグ部１１の履帯回転方向Ａ１の前側の面１０ａ，１１ａは、履帯外周側に向かうに従って履帯回転方向Ａ１後方に移行する傾斜面とされており）、図５に示すように、履帯側部側ラグ部１１の履帯回転方向Ａ１前側の面１１ａの、履帯厚さ方向の線分Ｎに対する傾斜角ｅは、履帯中央側ラグ部１０の履帯回転方向Ａ１前側の面１０ａの、履帯厚さ方向の線分Ｍに対する傾斜角ｄよりも大となるように形成されていて、履帯中央側ラグ部１０の履帯回転方向Ａ１前側の面１０ａの履帯周方向Ａに対する傾斜よりも、履帯側部側ラグ部１１の履帯回転方向Ａ１前側の面１１ａの履帯周方向Ａに対する傾斜が緩やかとされており、これによって、履帯側部側ラグ部１１の排土性を向上させている。
【００１６】
また、本実施の形態にあっては、ラグ９Ａ，９Ｂは、履帯中央側ラグ部１０の履帯幅方向Ｂ一側にのみ履帯側部側ラグ部１１を連続状に備えたラグ９Ａと、履帯中央側ラグ部１０の履帯幅方向Ｂ他側にのみ履帯側部側ラグ部１１を連続状に備えたラグ９Ｂとが履帯周方向Ａに交互に配置されている。
したがって、履帯側部側ラグ部１１の履帯周方向ＡのピッチＰ２は、履帯中央側ラグ部１０の履帯周方向ＡのピッチＰ１の２倍とされており、これにより履帯周方向Ａで隣り合う履帯側部側ラグ部１１間の排土性を良好にして、牽引力の増加が図られている。
【００１７】
なお、履帯周方向Ａで隣り合う一方のラグ９Ａと、他方のラグ９Ｂとの間に、履帯中央側ラグ部１０のみを有するラグを、１又は複数設けることにより、履帯側部側ラグ部１１の履帯周方向ＡのピッチＰ２が、履帯中央側ラグ部１０の履帯周方向ＡのピッチＰ１の３倍以上となるように構成してもよく、これにより、牽引性能が増加する。
また、本実施の形態にあっては、図３に示すように、履帯本体２の厚みは、幅方向Ｂ側部において、幅方向Ｂ外方に向かうに従って漸次肉厚が減少するように構成されていて、履帯側部側ラグ部１１のラグ高さＨ（履帯本体２の外周面からラグ９Ａ，９Ｂの接地面までの距離）が高くなるように構成されており、これによって、牽引力を増加させている。
【００１８】
また、駆動突起７の左右両側の、履帯本体２の内周面は外つばタイプの転輪１６が転動する転輪通過面１５（レール面）とされており、この転輪通過面１５に対応する位置に履帯中央側ラグ部１０が設けられており、転輪１６の左右両輪体１６ａが、履帯中央側ラグ部１０上を通過する為、転輪１６の落ち込みが左右かたよらず、これによって左右揺れの原因とならないという効果を奏する。
また、履帯中央側ラグ部１０は排土性がよいので、履帯中央側ラグ部１０の履帯周方向Ａのピッチ長Ｐ１を短くすることができ、それにより、走行時の振動低減を図ることができる。
【００１９】
なお、図例では、履帯中央側ラグ部１０の左右の両斜部１３（側部）が転輪通過面１５に対応する位置に配置されているが、履帯中央側ラグ部１０の左右斜部１３の少なくとも一方が、転輪通過面１５に対応する位置に配置されるように構成されていてもよい。
また、本実施の形態では、履帯中央側ラグ部１０は、回転方向Ａ１に向けて凸となる湾曲状（円弧状）に形成されており、この履帯中央側ラグ部１０の曲率半径は、履帯側部側ラグ部１１の曲率半径よりも小さくなっていて、履帯中央側ラグ部１０の斜部１３の履帯幅方向Ｂに対する傾斜角Ｃに対して、該斜部１３に連続する履帯側部側ラグ部１１の部分の傾斜角Ｄが小さくなっている。
【００２０】
これによって、履帯側部側ラグ部１１の回転方向Ａ１前方側の排土性を良くして、泥詰まりを防止している。
また、履帯側部側ラグ部１１は回転方向Ａ１後方に凸となる湾曲状に形成されていることから、もし、履帯側部側ラグ部１１の左右方向外端側の回転方向Ａ１先端側が、履帯中央側ラグ部１０の回転方向Ａ１先端部と、履帯周方向Ａに関して略同じような位置にあると、履帯側部側ラグ部１１の回転方向Ａ１前側に、泥、雪等が残ってしまい、さらには、履帯周方向Ａで隣り合う履帯側部側ラグ部１１間の泥詰まりが増加し、牽引力低下につながるが、本実施の形態では、履帯側部側ラグ部１１の、左右方向外端側の回転方向Ａ１先端部が、履帯中央側ラグ部１０の回転方向Ａ１先端部よりも、寸法Ｌだけ回転方向Ａ１後方側に位置しており、これにより、履帯側部側ラグ部１１によって良好な牽引力を得ながらも、履帯側部側ラグ部１１の排土性を良好なものにしている。
【００２１】
また、本実施の形態では、履帯中央側ラグ部１０の先端に接する履帯幅方向Ｂの線分Ｆと、この線分Ｆと履帯１の幅方向ＢのセンターＪとの交点を通り履帯側部側ラグ部１１の接地面１４の縁部に接する線分Ｇとの成す角度Ｅは、３°〜７０°に形成するのが好ましい（３°未満であると、排土性が低下し、７０°を超えると牽引力が低下する）。
前記履帯１は、周方向Ａ全周に亘って連続一体的に形成されたものであってもよいし、また、履帯本体２が周方向Ａに複数に分割状とされると共に、各履帯構成体が相互に連結されて無端帯状とされた、分割式の履帯１であってもよい。
【００２２】
また、履帯１の幅やラグピッチ等の変更により、履帯中央側ラグ部１０の履帯回転方向Ａ１先端と、履帯側部側ラグ部１１の履帯回転方向Ａ１前側の底部との距離ａ関係を変えることができる。
なお、履帯側部側ラグ部１１の履帯回転方向Ａ１前側の湾曲深さｂを深くすることにより、牽引力は増すが、排土性は悪くなるので、これを考慮して、履帯中央側ラグ部１０の接地面１４の履帯回転方向Ａ１先端と、履帯側部側ラグ部１１の接地面１４の、履帯幅方向Ｂ外端側の履帯回転方向Ａ１先端との、履帯周方向Ａに関する距離ａ関係を適当な寸法にするのがよい。
【００２３】
図６〜図９は他の実施の形態を開示したものである。
図６に示す履帯１は、外周部全周にわたって歯を有する駆動スプロケットによって駆動されるタイプの履帯１を示しており、１８は、履帯本体２内に、履帯周方向Ａに間隔をおいて埋設された芯金であり、１９は、クローラ式走行装置の駆動スプロケットの歯が挿入される駆動用穴を示している。
図７及び図８に示す履帯１は、履帯本体２の幅方向Ｂ両側が、履帯幅方向Ｂ外方に向かうに従って履帯内周側に移行する傾斜状となるように形成されたものであって、履帯本体２の肉厚を減少させずに、履帯側部側ラグ部１１のラグ高さＨを履帯中央側ラグ部１０のラグ高さＨよりも高く採ることができるように構成されたものである。
【００２４】
また、図７及び図８に示す履帯１にあっては、履帯中央側ラグ部１０の、履帯側部側ラグ部１１が接続されている側とは反対側の端部が、転輪通過面１５の左右方向Ｂ外端部位置まで延びている。
図９に示す履帯１は、この履帯１が装着される機械の本機の左右幅を広く採るために、駆動突起７が、履帯本体２の幅方向ＢのセンターＪから履帯幅方向Ｂ外方側に所定量ｇ、オフセットされていて、転輪通過面１５が、履帯本体２の幅方向Ｂ中央部から幅方向Ｂ外方側にオフセットされたものを示している。
【００２５】
なお、図９は、本機に装着される左右一対の履帯１の一部の平面図を示している。
なお、図例では、履帯中央側ラグ部１０の左右斜部１３のいずれか一方から履帯側部側ラグ部１１が一体的に延出されているラグ９Ａ，９Ｂを例示したが、これに限定されることはなく、ラグは、履帯中央側ラグ部１０の左右両側から、履帯側部側ラグ部１１が一体的に延出されたものであってもよい。
この場合、履帯側部側ラグ部１１のピッチ長Ｐ２を履帯中央側ラグ部１０のピッチ長Ｐ１よりも大きくするために、履帯中央側ラグ部１０の左右両側に履帯側部側ラグ部１１を備えたラグ間に、履帯中央側ラグ部１０のみで構成されたラグを１又は複数介在させるようにするのがよい。
【００２６】
【発明の効果】
本発明によれば、ゴム様弾性体によって無端帯状に形成され、周方向に回転駆動される履帯本体の外周側に、履帯本体の幅方向中央側に位置する履帯中央側ラグ部と、履帯本体の幅方向側部に位置する履帯側部側ラグ部とを備え、履帯中央側ラグ部は、履帯の回転方向前方側に凸となる山形状に形成され、履帯側部側ラグ部は、履帯１の回転方向Ａ１後方側に凸となる湾曲状に形成されているので、良好な排土性と良好な牽引性能とを備えたラグパターンを有する弾性履帯を提供することができる。
【００２７】
また、履帯中央側ラグ部及び履帯側部側ラグ部は、履帯本体の周方向に亘って間隔をおいて設けられ、履帯側部側ラグ部の履帯周方向のピッチが、履帯中央側ラグ部の履帯周方向Ａのピッチの２倍以上とされていることにより、牽引力が向上する。
履帯側部側ラグ部１１が、履帯中央側ラグ部１０の履帯幅方向Ｂ両端部の内、いずれか一方から連続状に延出されて形成されているラグ９Ａ，９Ｂを有することにより、良好な排土性と良好な牽引性能とを備えたラグパターンを有する弾性履帯を提供することができる。
【００２８】
また、履帯側部側ラグ部が履帯中央側ラグ部に連続状に設けられており、履帯側部側ラグ部の履帯幅方向の外端側の履帯回転方向先端側が、履帯中央側ラグ部の履帯回転方向先端よりも、履帯回転方向後方側に位置していることにより、履帯側部側ラグ部の履帯回転方向前方側の排土性がよい。
また、履帯中央側ラグ部が、転輪通過面に対応して位置していることにより、振動低下を図ることができる。
また、履帯中央側ラグ部及び履帯側部側ラグ部の履帯回転方向の前側の面は、履帯外周側に向かうに従って履帯回転方向後方に移行する傾斜面とされており、履帯側部側ラグ部の履帯回転方向の前側の面の履帯周方向に対する傾斜が、履帯中央側ラグ部の履帯回転方向の前側の面の履帯周方向に対する傾斜よりも、緩やかに形成されていることにより、履帯側部側ラグ部の履帯回転方向前方側の排土性がよい。
【００２９】
中央側ラグ部１０は履帯回転方向Ａ１前方側に凸となる円弧状に形成され、側部側ラグ部１１は履帯回転方向Ａ１後方側凸となる円弧状に形成されていて、中央側ラグ部１０の曲率半径は、側部側ラグ部１１の曲率半径よりも小であることにより、履帯側部側ラグ部の履帯回転方向前方側の排土性がよい。
また、履帯側部側ラグ部のラグ高さを、履帯中央側ラグ部のラグ高さよりも高くすることにより、牽引力が増加する。
また、履帯中央側ラグ部の履帯幅方向一側に履帯側部側ラグ部を連続状に備えたラグと、履帯中央側ラグ部の履帯幅方向他側に履帯側部側ラグ部を連続状に備えたラグとが履帯周方向に交互に配置されていることにより、良好な排土性と良好な牽引性能とを備えたラグパターンを有する弾性履帯を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る弾性履帯を示す図であって、上側部分は履帯の外周面を示しており、下側部分は履帯の内周側を示している図である。
【図２】ラグパターンの一部の拡大図である。
【図３】図１のＫ−Ｋ線矢示断面図である。
【図４】履帯の一部の側面図である。
【図５】（ａ）は図２のＸ−Ｘ線矢示断面図であり、（ｂ）は図２のＹ−Ｙ線矢示断面図である。
【図６】他の実施の形態に係る弾性履帯の外周側からみた図である。
【図７】他の実施の形態に係る弾性履帯を示す図であって、上側部分は履帯の外周面を示しており、下側部分は履帯の内周側を示している図である。
【図８】図７に示す履帯の幅方向の断面図である。
【図９】他の実施の形態に係る弾性履帯を示す図であって、上側部分は履帯の外周面を示しており、下側部分は履帯の内周側を示している図である。
【符号の説明】
１　　弾性履帯
２　　履帯本体
９Ａ　ラグ
９Ｂ　ラグ
１０　　履帯中央側ラグ部
１１　　履帯側部側ラグ部
１２　　頂部
１３　　斜部
１５　　転輪通過面
Ａ　　履帯周方向
Ｂ　　履帯幅方向
Ａ１　履帯回転方向（前進回転方向）
Ｈ　　ラグ高さ
Ｐ１　履帯中央側ラグ部の履帯周方向のピッチ
Ｐ２　履帯側部側ラグ部の履帯周方向のピッチ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elastic crawler belt used for a crawler type traveling device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a traveling device employed in a traveling unit such as a snowmobile or a combine, a crawler type in which a crawler belt is mounted on a drive wheel and an idler and the like is run by rotating the crawler belt in a circumferential direction. There is a traveling device.
As a crawler belt of the crawler type traveling device, there is an elastic crawler belt provided with a crawler belt body formed in an endless belt shape by a rubber-like elastic body and provided with a lug on the outer peripheral side of the crawler belt body.
[0003]
As a lug of this elastic crawler belt, a central lug portion which is located at a central portion in the width direction of the crawler belt and which is convex to one side in the circumferential direction of the crawler belt; A pair of left and right side lugs extending in the inclined direction that shifts to the other side in the crawler belt circumferential direction as they reach, there is a lug configured as a mountain shape that is convex to one side in the crawler belt circumferential direction as a whole (for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-3-42383 (FIG. 1).
[0005]
[Problems to be solved by the invention]
Since the conventional lug is formed in a mountain shape which is convex to one side in the circumferential direction of the crawler belt as a whole, when the crawler belt is rotated to one side in the circumferential direction, it is excellent in soil discharging property, but is soft. There is a problem that the traction force is poor on the ground and on snowy roads.
The present invention has been made in view of the above problems, and has as its object to provide an elastic crawler belt provided with a lug pattern having good earth discharging properties and good traction performance.
[0006]
[Means for Solving the Problems]
The technical measures taken by the present invention to solve the technical problem include a crawler belt body 2 formed in an endless belt shape by a rubber-like elastic body and driven to rotate in the circumferential direction A. A crawler belt center side lug portion 10 located on the width direction B center side of the crawler belt body 2 and a crawler belt side portion lug portion 11 located on the crawler belt body 2 in the width direction B side; 10 is formed in a mountain shape which becomes convex in the rotation direction A1 front side of the crawler belt 1, and the crawler belt side lug portion 11 is formed in a curved shape which becomes convex in the rotation direction A1 rear side of the crawler belt 1. It is characterized by.
[0007]
Further, the crawler belt center side lug portion 10 and the crawler belt side portion lug portion 11 are provided at intervals over the circumferential direction A of the crawler belt main body 2, and the pitch P2 of the crawler belt side portion lug portion 11 in the crawler belt circumferential direction A is provided. Is preferably at least twice the pitch P1 of the crawler belt center side lug portion 10 in the crawler belt circumferential direction A.
Further, the crawler belt side lug portion 11 preferably has lugs 9A and 9B that are formed to extend continuously from only one of the two ends of the crawler belt center side lug portion 10 in the crawler belt width direction B. .
[0008]
Further, the crawler belt side lug portion 11 is provided continuously to the crawler belt center side lug portion 10, and the crawler belt rotation direction A1 tip end side of the outer end side of the crawler belt side lug portion 11 in the crawler belt width direction B is crawler belt. It is preferable that the center lug portion 10 be located on the rear side in the crawler belt rotation direction A1 with respect to the tip of the crawler belt rotation direction A1.
Further, the crawler belt center side lug portion 10 is preferably located corresponding to the wheel passing surface 15.
The front surfaces 10a and 11a of the crawler belt center side lug portion 10 and the crawler belt side portion lug portion 11 in the crawler belt rotation direction A1 are inclined surfaces that shift rearward in the crawler belt rotation direction A1 toward the outer circumference of the crawler belt. The inclination of the front surface 11a of the crawler side lug portion 11 in the crawler rotation direction A1 with respect to the crawler circumferential direction A is greater than the inclination of the front surface 10a of the crawler crawler lug portion 10 in the crawler rotation direction A1 with respect to the crawler circumferential direction. Also, it is good that it is formed gently.
[0009]
The center lug portion 10 is formed in an arc shape that protrudes forward in the crawler belt rotation direction A1, and the side lug portion 11 is formed in an arc shape that protrudes in the crawler belt rotation direction A1 rearward. The radius of curvature of the lug portion 10 is smaller than the radius of curvature of the side lug portion 11, and the lug height H of the crawler belt side lug portion 11 is greater than the lug height H of the crawler belt center side lug portion 10. Should be high.
Also, a lug 9A having a continuous track side lug section 11 only on one side of the track center side lug section 10 in the track width direction B and a track track only on the other side of the track center side lug section 10 in the track width direction B. It is preferable that the lugs 9B provided with the side lugs 11 in a continuous manner are alternately arranged in the crawler belt circumferential direction A.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention, in which reference numeral 1 denotes an elastic crawler track (hereinafter simply referred to as a crawler track) employed in a crawler-type traveling device.
The crawler-type traveling device includes, for example, a drive wheel (drive sprocket) arranged on one side in the front and rear direction of the traveling direction, an idler arranged on the other side in the front and rear direction of the traveling direction, and a plurality of wheels arranged between the driving wheel and the idler. And a driving wheel, an idler, and an endless belt-shaped crawler belt 1 wound around the plurality of rolling wheels, and a driving force is transmitted from the driving wheel to the crawler belt 1 so that the crawler belt 1 is rotated. It is configured to run by rotating (circulating and running) in the direction A, and is normally provided in a pair of right and left with respect to the main body of the running body.
[0011]
The crawler belt 1 has a crawler belt main body 2 formed in an endless belt shape from a rubber-like elastic body. In the crawler belt main body 2, a tensile member 3 and a reinforcing layer 4 are embedded over the entire circumference of the crawler belt circumferential direction A. Have been.
The tensile body 3 is formed by, for example, inserting a tensile strength cord 6 such as an endless steel cord embedded in the crawler belt main body 2 as a single winding along the circumferential direction A in the crawler belt width direction B (lateral direction). The driving force transmitted from the drive wheels is transmitted to the other parts of the crawler belt 1 at appropriate intervals, and the tension is applied to the crawler belt 1 in the circumferential direction A. The crawler belt 1 is buried in the crawler belt main body 2 so as to have a function to withstand it.
[0012]
The reinforcing layer 4 is made of a canvas or the like having a function of protecting the tensile body 3 from an external injury and improving the torsion and lateral rigidity of the crawler belt 1 to prevent the crawler belt from coming off. A drive projection 7 made of a rubber-like elastic body for transmitting a driving force from a drive wheel to the crawler belt main body 2 is provided on an inner peripheral side of the crawler belt main body 2 in the crawler belt circumferential direction A. Numerals 7 are provided integrally at the center of the crawler belt body 2 in the width direction B at intervals in the crawler belt circumferential direction A.
Further, lugs 9A and 9B having functions such as protection of the tensile member 3 and the reinforcing layer 4, transmission of traction force, reduction of input vibration, etc. are provided on the outer peripheral side of the crawler belt body 2 in the crawler belt circumferential direction A and on the crawler belt. They are provided at intervals in the circumferential direction A.
[0013]
The lugs 9A and 9B are formed of a rubber-like elastic body, and are formed in a trapezoidal cross-section having a gradually narrowing width from the base side connected to the crawler belt body 2 toward the grounding surface 14. A crawler belt center side lug portion 10 located on the center side in the direction B; a crawler belt side portion lug portion 11 formed continuously with the crawler belt center side lug portion 10 and located on the width direction B side portion of the crawler belt body 2; It has.
The crawler belt center side lug portion 10 is formed in a mountain shape that protrudes forward in the rotation direction A1 (forward rotation direction) of the crawler belt 1, and the crawler belt side portion lug portion 11 protrudes in the rotation direction A1 rearward direction of the crawler belt 1. It is formed in a curved shape (arc shape).
[0014]
That is, the mountain-shaped crawler belt center-side lug portion 10 has a top portion 12 which is a tip side portion in the crawler belt rotation direction A1 and a slope which shifts from the left and right sides of the top portion 12 to the rear in the rotation direction A1 as going outward in the left-right direction. And a sloping portion 13 extending in the direction of the crawler belt. The crawler belt side lugs 11 protrude rearward in the rotation direction A1 of the crawler belt 1 from one of the right and left oblique portions 13 of the crawler belt center side lug 10. (One end of the lug 9A, 9B in the crawler belt width direction B extends to the end of the crawler belt body 2 in the width direction B (or in the vicinity thereof) to form a lug 9A. , 9B slightly end beyond the center in the width direction B of the crawler belt main body 2 and end at a position corresponding to the wheel passing surface 15 (projection area of the wheel passing surface 15) described later. Shape).
[0015]
In the lugs 9A and 9B having the above-described configuration, the crawler belt center side lug portion 10 located at the center in the width direction B of the crawler belt main body 2 is formed in a mountain shape that protrudes forward in the rotation direction A1 of the crawler belt 1. By doing so, the soil discharging property during running becomes good, and the crawler belt side lug 11 located on the width direction B side of the crawler belt main body 2 has a curved shape protruding rearward in the rotation direction A1 of the crawler belt 1. As described above, since it is integrally extended from one of the left and right inclined portions 13 of the crawler belt center side lug portion 10, good traction performance is obtained.
Also, the front and rear surfaces of the crawler belt center side lug portion 10 and the crawler belt side portion lug portion 11 around the crawler belt rotation direction A1 are inclined surfaces in which the front-rear spacing in the crawler belt rotation direction A1 gradually narrows from the crawler belt main body 2 to the ground contact surface 14. (Therefore, the front surfaces 10a and 11a of the crawler belt center side lug portion 10 and the crawler belt side portion lug portion 11 in the crawler belt rotation direction A1 are inclined surfaces that shift rearward in the crawler belt rotation direction A1 as going toward the crawler belt outer peripheral side. As shown in FIG. 5, the inclination angle e of the front surface 11a of the crawler belt side lug portion 11 in the crawler belt rotation direction A1 with respect to the line segment N in the crawler belt thickness direction is equal to the crawler belt center side lug portion. The surface 10a of the front surface 10a of the crawler belt rotation direction A1 is formed so as to be larger than the inclination angle d with respect to the line segment M in the crawler belt thickness direction, and the front surface of the crawler belt center side lug 10 in the crawler belt rotation direction A1 front surface. Crawler track circumferential direction 10a The inclination of the front surface 11a of the crawler belt side lug portion 11 on the front side in the crawler belt rotation direction A1 with respect to the crawler belt circumferential direction A is gentler than that of the crawler belt side lug portion 11. Have improved.
[0016]
Further, in the present embodiment, the lugs 9A and 9B are composed of a lug 9A in which the crawler belt side lugs 11 are continuously provided only on one side in the crawler belt width direction B of the crawler belt center lugs 10; The lugs 9B provided with the track side lugs 11 in a continuous manner only on the other side in the track width direction B of the center side lug 10 are alternately arranged in the track circumferential direction A.
Therefore, the pitch P2 of the crawler belt side lugs 11 in the crawler belt circumferential direction A is twice the pitch P1 of the crawler belt center lugs 10 in the crawler belt circumferential direction A, and thereby, they are adjacent in the crawler belt circumferential direction A. The earth discharging property between the crawler belt side lugs 11 is improved, and the traction force is increased.
[0017]
By providing one or more lugs having only the crawler belt center side lug portion 10 between one lug 9A and the other lug 9B adjacent in the crawler belt circumferential direction A, the crawler belt side portion lug portion 11 is provided. May be configured to be three times or more as large as the pitch P1 of the crawler belt center side lug portion 10 in the crawler belt circumferential direction A, thereby increasing traction performance.
Further, in the present embodiment, as shown in FIG. 3, the thickness of the crawler belt main body 2 is configured such that the thickness gradually decreases toward the outside in the width direction B on the side in the width direction B. And the lug height H (the distance from the outer peripheral surface of the crawler belt body 2 to the grounding surfaces of the lugs 9A and 9B) of the crawler belt side lugs 11 is increased, thereby increasing the tractive force. Let me.
[0018]
The inner peripheral surfaces of the crawler belt main body 2 on both the left and right sides of the drive projection 7 are formed as rolling wheel passing surfaces 15 (rail surfaces) on which the outer brim type rolling wheels 16 roll. A crawler belt center side lug portion 10 is provided at a corresponding position, and both left and right wheel bodies 16a of the rolling wheel 16 pass over the crawler belt center side lug portion 10, so that the falling of the rolling wheel 16 does not depend on the left or right. This has the effect of not causing lateral sway.
In addition, since the crawler belt center side lug portion 10 has good soil discharging properties, the pitch length P1 of the crawler belt center side lug portion 10 in the crawler belt circumferential direction A can be shortened, thereby reducing vibration during traveling. it can.
[0019]
In the illustrated example, the left and right inclined portions 13 (side portions) of the crawler belt center side lug portion 10 are arranged at positions corresponding to the wheel passing surface 15. 13 may be configured to be disposed at a position corresponding to the wheel passing surface 15.
Further, in the present embodiment, the crawler belt center side lug portion 10 is formed in a curved shape (arc shape) that is convex in the rotation direction A1, and the radius of curvature of the crawler belt center side lug portion 10 is crawler belt. The radius of curvature of the side lug portion 11 is smaller than the radius of curvature of the side lug portion 11, and the inclination angle C of the inclined portion 13 of the crawler belt central side lug portion 10 with respect to the crawler width direction B is continuous with the inclined portion 13. The inclination angle D of the lug portion 11 is small.
[0020]
Thereby, the soil discharging property of the crawler belt side lug portion 11 on the front side in the rotation direction A1 is improved, and mud clogging is prevented.
In addition, since the crawler belt side lug portion 11 is formed in a curved shape that protrudes rearward in the rotation direction A1, if the crawler belt side lug portion 11 has a rotation direction A1 distal end side on the left and right outer ends, When the tip of the crawler belt center side lug portion 10 is substantially at the same position as the tip end in the rotation direction A1 with respect to the crawler belt circumferential direction A, mud, snow, and the like remain on the front side of the crawler belt side lug portion 11 in the rotation direction A1. Further, the clogging between the crawler belt side lugs 11 adjacent in the crawler belt circumferential direction A increases, which leads to a decrease in tractive force. However, in the present embodiment, the crawler belt side lugs 11 are outside the left and right directions. The end portion in the rotation direction A1 on the end side is located rearward in the rotation direction A1 by the dimension L from the rotation direction A1 end portion of the crawler belt center side lug portion 10, thereby the crawler belt side portion lug 11 While obtaining good traction, the track side lug 11 The soil properties are in good.
[0021]
Also, in the present embodiment, the crawler belt side portion passes through the intersection of the line segment F in the crawler belt width direction B contacting the tip of the crawler belt center side lug portion 10 and the center J of the crawler belt 1 in the width direction B. It is preferable that the angle E between the side lug portion 11 and the line segment G in contact with the edge of the grounding surface 14 is formed in a range of 3 ° to 70 °. °, traction decreases.)
The crawler belt 1 may be formed continuously and integrally over the entire circumference in the circumferential direction A, or the crawler belt body 2 may be divided into a plurality in the circumferential direction A, and The crawler belt 1 may be a split crawler belt in which the bodies are connected to each other to form an endless belt.
[0022]
Further, by changing the width of the crawler belt 1 or the rug pitch, etc., the distance a relationship between the tip of the crawler belt rotation direction A1 of the crawler belt center side lug part 10 and the bottom of the crawler belt side lug part 11 on the front side of the crawler belt rotation direction A1 is changed. Can be.
By increasing the curved depth b of the front side of the crawler belt side lug portion 11 in the crawler belt rotation direction A1, the tractive force is increased, but the earth discharging property is deteriorated. Distance a in the crawler belt circumferential direction A between the front end of the crawler belt rotation direction A1 of the grounding surface 14 of FIG. Should be appropriately dimensioned.
[0023]
6 to 9 disclose another embodiment.
The crawler belt 1 shown in FIG. 6 shows a crawler belt 1 of a type driven by a driving sprocket having teeth over the entire outer peripheral portion, and 18 is embedded in the crawler belt body 2 at intervals in the crawler belt circumferential direction A. Reference numeral 19 denotes a driving hole into which teeth of a driving sprocket of the crawler type traveling device are inserted.
The crawler belt 1 shown in FIGS. 7 and 8 is formed so that both sides in the width direction B of the crawler belt main body 2 are inclined so as to shift toward the inner circumference side of the crawler belt as going outward in the crawler belt width direction B. A configuration in which the lug height H of the crawler belt side lug portion 11 can be set higher than the lug height H of the crawler belt central lug portion 10 without reducing the thickness of the crawler belt main body 2. It is.
[0024]
In the crawler belt 1 shown in FIGS. 7 and 8, the end of the crawler belt center side lug part 10 opposite to the side to which the crawler belt side part lug part 11 is connected is a wheel passing surface. 15 extend to the outer end position in the left-right direction B.
In the crawler belt 1 shown in FIG. 9, the drive projection 7 is moved outward from the center J of the crawler belt body 2 in the width direction B so as to take a wider left and right width of the machine on which the crawler belt 1 is mounted. The center of the crawler belt body 2 in the width direction B is offset from the center in the width direction B to the outside in the width direction B.
[0025]
FIG. 9 is a plan view of a part of a pair of left and right crawler belts 1 mounted on the machine.
In the illustrated example, the lugs 9A and 9B in which the crawler belt side lugs 11 extend integrally from one of the left and right inclined portions 13 of the crawler belt center lugs 10 are illustrated, but the present invention is not limited thereto. Instead, the lugs may be formed by integrally extending the crawler belt side lugs 11 from the left and right sides of the crawler belt center side lug 10.
In this case, in order to make the pitch length P2 of the track side lugs 11 larger than the pitch P1 of the track center lugs 10, the track side lugs 11 are provided on both the left and right sides of the track center lugs 10. It is preferable that one or a plurality of lugs composed only of the crawler belt center side lug portion 10 are interposed between the provided lugs.
[0026]
【The invention's effect】
According to the present invention, a crawler belt center side lug portion formed at an outer peripheral side of a crawler belt main body which is formed in an endless belt shape by a rubber-like elastic body and is rotationally driven in the circumferential direction, and is located at a widthwise center side of the crawler belt main body, A crawler belt side lug portion located on the width direction side of the crawler belt, the crawler belt center side lug portion is formed in a mountain shape that protrudes forward in the rotation direction of the crawler belt, and the crawler belt side lug portion includes a crawler belt. The elastic crawler belt having a lug pattern having a good earth discharging property and a good traction performance can be provided because it is formed in a curved shape protruding rearward in the first rotation direction A1.
[0027]
Further, the crawler belt center side lug portion and the crawler belt side portion lug portion are provided at intervals over the circumferential direction of the crawler belt body, and the crawler belt side portion lug pitch in the crawler belt circumferential direction is equal to the crawler belt center side lug portion. By setting the pitch in the crawler belt circumferential direction A to twice or more, the traction force is improved.
The crawler belt side lug portion 11 has good lugs 9A and 9B formed by extending continuously from one of the both ends of the crawler belt center side lug portion 10 in the crawler belt width direction B. It is possible to provide an elastic crawler belt having a lug pattern having excellent earth removal properties and good traction performance.
[0028]
Also, the crawler belt side lugs are provided in a continuous manner at the crawler belt center lugs, and the outer circumferential side of the crawler belt side lugs in the crawler belt width direction has a crawler belt center lug. By being located on the rear side in the crawler belt rotation direction with respect to the front end in the crawler belt rotation direction, the crawler belt side lugs have good soil removal properties on the front side in the crawler belt rotation direction.
Further, since the crawler belt center side lug portion is located corresponding to the wheel passing surface, vibration can be reduced.
Further, the front surface of the crawler belt center side lug portion and the crawler belt side portion lug portion in the crawler belt rotation direction is an inclined surface which shifts rearward in the crawler belt rotation direction toward the outer circumference of the crawler belt. The inclination of the front surface of the crawler belt rotation direction with respect to the crawler belt circumferential direction is formed more gently than the inclination of the front surface of the crawler belt center side lug portion in the crawler belt rotation direction with respect to the crawler belt circumferential direction. Good soil removal on the front side in the crawler belt rotation direction of the side lugs.
[0029]
The center-side lug portion 10 is formed in an arc shape that protrudes forward in the crawler belt rotation direction A1, and the side-side lug portion 11 is formed in an arc shape that protrudes in the crawler belt rotation direction A1. The radius of curvature of 10 is smaller than the radius of curvature of the side lug portion 11, so that the crawler belt side lug portion has good soil discharging property on the front side in the crawler belt rotation direction.
In addition, by setting the lug height of the crawler belt side lug portion to be higher than the lug height of the crawler belt center lug portion, the tractive force increases.
Also, a rug with a continuous track side lug on one side of the track center side lug in the track width direction and a continuous track side lug on the other side of the track center side lug in the track width direction. Since the lugs provided in the above are alternately arranged in the crawler belt circumferential direction, it is possible to provide an elastic crawler belt having a lug pattern having good earth discharging property and good traction performance.
[Brief description of the drawings]
FIG. 1 is a view showing an elastic crawler belt according to an embodiment of the present invention, in which an upper portion shows an outer circumferential surface of the crawler belt and a lower portion shows an inner circumferential side of the crawler belt.
FIG. 2 is an enlarged view of a part of a lug pattern.
FIG. 3 is a sectional view taken along line KK of FIG. 1;
FIG. 4 is a side view of a part of the crawler belt.
5A is a sectional view taken along line XX of FIG. 2, and FIG. 5B is a sectional view taken along line YY of FIG.
FIG. 6 is a view of an elastic crawler belt according to another embodiment as viewed from the outer peripheral side.
FIG. 7 is a diagram showing an elastic crawler belt according to another embodiment, in which an upper portion shows an outer circumferential surface of the crawler belt and a lower portion shows an inner circumferential side of the crawler belt.
8 is a cross-sectional view of the crawler belt shown in FIG. 7 in a width direction.
FIG. 9 is a diagram showing an elastic crawler belt according to another embodiment, in which an upper portion shows an outer peripheral surface of the crawler belt and a lower portion shows an inner peripheral side of the crawler belt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elastic crawler belt 2 Crawler belt main body 9A Lug 9B Lug 10 Crawler belt center side lug part 11 Crawler belt side side lug part 12 Top part 13 Slant part 15 Roller wheel passing surface A Crawler belt circumferential direction B Crawler belt width direction A1 Crawler belt rotation direction (forward rotation direction)
H Lug height P1 Crawler track circumferential lug pitch P2 Crawler track side lug pitch P circumferential pitch

Claims

A crawler belt body (2) formed in an endless belt shape by a rubber-like elastic body and rotationally driven in the circumferential direction (A) is provided. A crawler belt center lug (10) located on the center side and a crawler belt side lug (11) located on the width direction (B) side of the crawler belt body (2); The crawler belt (1) is formed in a mountain shape that is convex forward in the rotation direction (A1) of the crawler belt (1), and the crawler belt side lugs (11) are in the rotation direction (A1) rear side of the crawler belt (1). An elastic crawler belt characterized in that it is formed in a curved shape that is convex.

The crawler belt center side lug portion (10) and the crawler belt side portion lug portion (11) are provided at intervals in the circumferential direction (A) of the crawler belt body (2), and the crawler belt side lug portion (11). The pitch (P2) of the crawler belt circumferential direction (A) in the crawler belt circumferential direction (A) is at least twice the pitch (P1) of the crawler belt circumferential lug portion (10) in the crawler belt circumferential direction (A). The elastic crawler according to the above.

A lug (9A, 9B) formed by extending the crawler belt side lug portion (11) from only one of both ends of the crawler belt center side lug portion (10) in the crawler belt width direction (B). The elastic crawler belt according to claim 1 or 2, wherein:

The crawler side lug (11) is continuously provided on the crawler center side lug (10), and the crawler belt rotation on the outer end side in the crawler width direction (B) of the crawler side lug (11). 4. The crawler belt rotation direction (A1) rearward side of the crawler belt center side lug (10) in the crawler belt rotation direction (A1) tip of the crawler belt center side lug (10). The elastic crawler according to any of the above.

The elastic crawler belt according to any one of claims 1 to 4, wherein the crawler belt center side lug (10) is located corresponding to the wheel passing surface (15).

The front surfaces (10a, 11a) of the crawler belt center side lug portion (10) and the crawler belt side portion lug portion (11) in the crawler belt rotation direction (A1) shift rearward in the crawler belt rotation direction A1 toward the outer periphery of the crawler belt. The inclination of the front side surface (11a) of the crawler belt side lug portion (11) in the crawler belt rotation direction (A1) with respect to the crawler belt circumferential direction (A) is the inclination of the crawler belt center side lug portion (10). The elastic crawler belt according to any one of claims 1 to 5, wherein the elastic crawler belt is formed to be gentler than the inclination of the front surface (10a) in the crawler belt rotation direction (A1) with respect to the crawler belt circumferential direction (A).

The center lug (10) is formed in an arc shape that protrudes forward in the crawler belt rotation direction (A1), and the side lug portion (11) is formed in an arc shape that protrudes rearward in the crawler rotation direction (A1). The elastic crawler belt according to any one of claims 1 to 5, wherein a radius of curvature of the center lug (10) is smaller than a radius of curvature of the side lug (11). .

The lug height (H) of the crawler belt side lugs (11) is higher than the lug height (H) of the crawler belt center lugs (10). Elastic crawler described.

A lug (9A) having a continuous track side lug (11) only on one side in the track width direction (B) of the track center lug (10), and a track of the track center lug (10) A lug (9B) having a crawler belt side lug (11) in a continuous manner only on the other side in the width direction (B) is alternately arranged in the crawler belt circumferential direction (A). An elastic crawler belt according to any one of claims 1 to 6.