JP3963317B2 - Installation structure of single-acting-double-acting circuit selector valve of hydraulic circuit attached to hydraulic excavator - Google Patents

Installation structure of single-acting-double-acting circuit selector valve of hydraulic circuit attached to hydraulic excavator Download PDF

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Publication number
JP3963317B2
JP3963317B2 JP2002280024A JP2002280024A JP3963317B2 JP 3963317 B2 JP3963317 B2 JP 3963317B2 JP 2002280024 A JP2002280024 A JP 2002280024A JP 2002280024 A JP2002280024 A JP 2002280024A JP 3963317 B2 JP3963317 B2 JP 3963317B2
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acting
double
selector valve
hydraulic
attached
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JP2004116103A (en
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宗義 池田
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Komatsu Ltd
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Komatsu Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
    • E02F9/0875—Arrangement of valve arrangements on superstructures

Description

【０００１】
【発明の属する技術分野】
本発明は、前部に作業機を取り付けた上部旋回体を下部走行体上に旋回可能に載置した油圧ショベルの、作業機先端部に交換可能に取り付ける付属作業具を駆動するための付属作業具油圧回路を単動式又は複動式に選択的に切り換え可能とする単動―複動回路セレクタバルブの設置構造に関する。
【０００２】
【従来の技術】
上下揺動自在に連結したブーム、アーム、及び作業具を有する作業機を前部に取り付けた上部旋回体を、下部走行体に旋回可能に載置した油圧ショベルにおいては、前記アームの先端部に取り付ける標準作業具（例えばバケット）を取り外して、破砕作業が可能なブレーカ作業具、又は圧砕作業が可能なクラッシャ作業具などの付属作業具を付け換えて使用できるようにしている。
【０００３】
図６は、付属作業具を駆動するための付属作業具油圧回路を示している。この付属作業具油圧回路は、付属作業具に設けた付属アクチュエータ（ブレーカ作業具の場合は油圧シリンダ、クラッシャ作業具の場合は油圧モータ）を制御する付属アクチュエータ制御弁５４を上部旋回体の内部に具え、該制御弁５４からの往復路の付属作業具用油圧ホース５５、５６を、ブーム４４及びアーム４５に沿って布設している。また、付属アクチュエータの駆動方式（ブレーカ作業具の場合：単動式、クラッシャ作業具の場合：複動式）に対応して、付属作業具油圧回路を単動式及び複動式のいずれか一方に選択的に切り換え可能とするため、復路の付属作業具用油圧ホース５６の回路に、単動―複動回路セレクタバルブ５７を介装している。
【０００４】
前記単動―複動回路セレクタバルブ５７は、上部旋回体の内部に設置されているのが通常であり、上部旋回体外部からの、単動―複動回路セレクタバルブ５７がどの駆動回路に切り換えられているかの確認と、必要な駆動回路への切換操作とを容易にするために、単動―複動回路セレクタバルブ５７を、上部旋回体フレームの周壁に設けた開口窓の近傍位置に寄せて配設している。（例えば、特許文献１参照）
【０００５】
また、ブーム、アーム、バケット等の標準作業具の各シリンダ用油圧ホースは、上部旋回体内に設置した各シリンダ制御弁から、マシンキャブの前面カバーに形成してある作業機用油圧ホース出口（以下単に、油圧ホース出口と言う）を経由して作業機側へ布設され、また前記付属作業具用油圧ホース５５、５６は、単動―複動回路セレクタバルブ５７から同じく油圧ホース出口を経由して作業機側へ布設されている。
【０００６】
【特許文献１】
特開２００１−２７１３７７号公報（第３頁、第１−２図、第６図）
【０００７】
【発明が解決しようとする課題】
しかしながら、上述したような従来の単動―複動回路セレクタバルブの設置構造には、次のような問題がある。
前述のように上部旋回体の内部に設置した単動―複動回路セレクタバルブ５７の切換状態の確認及びその切換操作を上部旋回体の外部から容易に可能とするために、該単動―複動回路セレクタバルブ５７は上部旋回体下部の周壁近傍の内部位置に設置されている。このため、その設置位置は、上部旋回体のマシンキャブの前面カバーに設けた油圧ホース出口から遠隔の位置にある。
それ故に、前記付属アクチュエータ制御弁５４から単動―複動回路セレクタバルブ５７を経由して布設する付属作業具用油圧ホース５６の配管が、フロント作業具用油圧ホース出口に遠回しに廻らされることとなって、付属作業具用油圧ホースの配管が長くなるという問題がある。また、上部旋回体内部の狭いスペースにその中の搭載機器類を避けて付属作業具用油圧ホースを配管しなければならず、その布設作業が困難であるという問題もある。さらに、上部旋回体内部から油圧ホース出口までの、付属作業具用油圧ホースの布設経路と、ブーム、アーム、バケットの標準作業具用油圧ホースの布設経路とが異なるために、上部旋回体内部にこれらの油圧ホースが雑然として布設された状態となり、整備性が損なわれるという問題点もある。
【０００８】
本発明は、上記問題点に着目したもので、油圧ショベルの作業機の付属作業具用油圧ホースの配管長さを短縮化できると共に、油圧ホースの布設が容易で、全体として整然とした配管状態が得られる、付属作業具油圧回路の単動―複動回路セレクタバルブの設置構造を提供することを目的としている。
【０００９】
【課題を解決するための手段】
上記目的を達成するために、本発明の第１発明は、上部旋回体の前部に取り付けた作業機の先端部に装着される付属作業具を制御する付属アクチュエータ制御弁と、該付属アクチュエータ制御弁を含む付属作業具油圧回路を単動式及び複動式のいずれか一方に選択的に切り換え可能とする単動―複動回路セレクタバルブとを上部旋回体のマシンキャブ内部に設置し、前記作業機を駆動する作業機シリンダ用の油圧ホース、及び前記単動―複動回路セレクタバルブからの付属アクチュエータ用油圧ホースをマシンキャブカバーに形成した油圧ホース出口を経由して作業機側に送り込むようにした油圧ショベルにおいて、前記単動―複動回路セレクタバルブを、マシンキャブの屋根の裏面付近に設置すると共に、前記マシンキャブの屋根の前記単動―複動回路セレクタバルブに面した部位に、開口窓を開けた構成としている。
【００１０】
第１発明によると、上部旋回体内部の上部空間である、マシンキャブ屋根の裏面付近に単動―複動回路セレクタバルブを配設するようにしたから、上部旋回体内部の搭載機器類の無い空スペースに該バルブを設置可能となる。このため、付属アクチュエータ用油圧ホースも含む作業機用油圧ホースを通すためのマシンキャブカバーの油圧ホース出口に対して近接させた位置に単動―複動回路セレクタバルブを設置することが、容易に可能となる。これにより、付属アクチュエータ用油圧ホースを略真っ直ぐに油圧ホース出口に向けて布設できるので、ホース長さを短縮できる。また、マシンキャブの屋根の単動―複動回路セレクタバルブに面した部位に開口窓を開けたため、単動―複動回路セレクタバルブの切換操作及び切換位置確認が可能となる。
【００１１】
第２発明は、第１発明において、前記単動―複動回路セレクタバルブが、前記油圧ホース出口に近接した位置に設置された構成としている。
【００１２】
第２発明によると、単動―複動回路セレクタバルブを、油圧ホース出口に近接した位置に設置することにより、付属作業具アクチュエータ用ホース配管を標準作業具用ホース配管と同じ経路に布設できる。従って、作業機配管の布設経路が統一されて整然とした配管となるので、整備性を向上できる。
【００１３】
また第３発明は、第２発明において、前記単動―複動回路セレクタバルブに接続する付属アクチュエータホースを出す付属アクチュエータ制御弁を、上部旋回体内部に上下方向に積み重ねて設置した作業機用シリンダ制御弁の最上段位置に設置し、前記付属アクチュエータホースを空中に布設して前記単動―複動回路セレクタバルブに接続した構成としている。
【００１４】
第３発明によると、付属アクチュエータ制御弁を、上下方向へ積み重ねて設置した作業機用シリンダ制御弁群の最上段位置に設置したため、該付属アクチュエータ制御弁と、マシンキャブ屋根の裏面付近に設置した前記単動―複動回路セレクタバルブとの間に、付属アクチュエータホースを上方の屋根や下方のフレームから離した空中位置に配設することができる。従って、従来のように上部旋回体内部の下部側に搭載機器類の間を縫って付属アクチュエータホースを布設するのに比して、非常に容易にホースの布設ができると共に、略真っ直ぐに布設できるからホース長さを短縮できる。
【００１５】
また第４発明は、第１、第２又は第３発明において、前記単動―複動回路セレクタバルブを、該バルブの切換操作部が前記開口窓に臨むように配設した構成としている。
【００１６】
第４発明によると、単動―複動回路セレクタバルブの切換操作部を開口窓に臨ませるようにしたから、切換操作部が外部に露出され、マシンキャブ外部からの切換状態の確認、及びその切換操作が容易にできる。
【００１７】
【発明の実施の形態】
以下に、図面に基づいて本発明に係る実施の形態を詳細に説明する。尚、図６の構成要素と同一構成要素には、同一符号を付して、以下での説明を省く。
【００１８】
作業機配管は、図１の油圧回路図で示すように、標準作業具油圧回路に属するブームシリンダ用油圧ホース１０，１１、アームシリンダ用油圧ホース１２，１３、およびバケットシリンダ用油圧ホース１４，１５と、付属作業具油圧回路に属する付属アクチュエータ用油圧ホース１６，１７，１８，１９との各油圧ホースを具えている。標準作業具油圧回路に属する前記油圧ホース１０〜１５のそれぞれは、ブームシリンダ制御弁２０、アームシリンダ制御弁２１、およびバケットシリンダ制御弁２２と、ブームシリンダ２３、アームシリンダ２４、およびバケットシリンダ２５との間にそれぞれ接続される。付属作業具油圧回路に属する付属アクチュエータ用油圧ホース１６〜１９は、付属アクチュエータ制御弁２６から、単動―複動回路セレクタバルブ２７を経由して付属アクチュエータ２８に接続される。
【００１９】
前記単動―複動回路セレクタバルブ２７は、ブレーカ作業具の場合に用いる単動回路切換位置Ａと、クラッシャ作業具の場合に用いる複動回路切換位置Ｂと、両単動回路切換位置Ａおよび複動回路切換位置Ｂの間を手動にて切り換え可能とした切換操作部２９とを有している。
【００２０】
前記単動回路切換位置Ａに切り換えると、付属アクチュエータ制御弁２６からの圧油は、往回路である一方側付属アクチュエータ用油圧ホース１６、１７を経由してブレーカへ供給されると共に、ブレーカからの戻り油は、復回路である他方側付属アクチュエータ用油圧ホース１９を経由してアキュームレータ３１を具えたタンク戻り回路３２に還流し、タンク３０にドレーンする。
【００２１】
前記複動回路切換位置Ｂに切り換えると、往回路と復回路である付属アクチュエータ用油圧ホース１６、１７と１８、１９は付属アクチュエータ制御弁２６に接続され、この付属アクチュエータ制御弁２６の切換により、前記往回路と復回路が選択的に油圧ポンプ３３とタンク３０に接続されるようになっている。
前記切換操作部２９は、ブレーカ作業具とクラッシャ作業具の切換位置を表示する表示マーク（図示せず）を有しており、いずれの切換位置にあるかの確認が外部から容易にできるようにしてある。
【００２２】
第２図は、前記した作業機シリンダ用の各油圧ホース１０〜１５、付属アクチュエータ用油圧ホース１６〜１９、各シリンダ制御弁２０〜２２、付属アクチュエータ制御弁２６、および複動回路セレクタバルブ２７を上部旋回体の内部に配設する油圧式ショベルの上面図を示している。該油圧ショベルは、上部旋回体に搭載する機器類の搭載範囲を全体的に囲うようにしたマシンキャブ３４を有している。マシンキャブ３４は、上部旋回体の後部のエンジン設置区域３５と、右側のシリンダ制御弁群設置区域３６と、中央部の作業機配管配設区域３７とに区分けされており、エンジン設置区域３５およびシリンダ制御弁群設置区域３６を、開閉可能に設けたキャブ屋根３８，３９でそれぞれ覆い、また作業機配管配設区域３７を、着脱可能に設けた屋根４０で覆っている。また、上部旋回体の左側前部には運転室６０が設置されている。
【００２３】
前記シリンダ制御弁群設置区域３６には、図３に示すように作動油タンク４１、バッテリ４２、前記標準作業具油圧回路に属する各シリンダ制御弁２０〜２２、及び付属作業具油圧回路に属する付属アクチュエータ制御弁２６が設置されている。また、前記作業機配管配設区域３７には、前記単動―複動回路セレクタバルブ２７、前記標準作業具油圧回路に属する各油圧ホース１０〜１５、及び付属アクチュエータ用油圧ホース１６〜１９がそれぞれ布設されている。
【００２４】
前記シリンダ制御弁群設置区域３６には、図４、図５に示すように、下段から順に標準作業具用の、ブームシリンダ制御弁２０、アームシリンダ制御弁２１、バケットシリンダ制御弁２２が積み重ねて設置され、その最上段位置には、前記付属アクチュエータ制御弁２６が載置されている。そして、上記各シリンダ制御弁２０〜２２および付属アクチュエータ制御弁２６からそれぞれ出る標準作業具用の各油圧ホース１０〜１５および付属アクチュエータ用油圧ホース１６、１８を同じ経路に布設して、隣接する作業機用油圧配管配設区域３７内に渡し込んでいる。
【００２５】
作業機配管配設区域３７内には、図４、図５に示すように、前記単動―複動回路セレクタバルブ２７と、クランプ部４３とが設けられており、該配設区域３７を覆うマシンキャブの屋根４０の前面部カバーには油圧ホース出口４６が形成されている。単動―複動回路セレクタバルブ２７は、油圧ホース出口４６に近接した位置に設置されている。また前記クランプ部４３は、前記シリンダ制御弁群設置区域３６より渡し込まれた前記標準作業具用の各油圧ホース１０〜１５、および前記単動―複動回路セレクタバルブ２７から出た付属アクチュエータ用油圧ホース１７，１９を束ねて収束させる。そして、これらの各油圧ホース１０〜１５，１７，１９は、油圧ホース出口４６内を経由して上部旋回体外部の作業機側へ送り出される。
【００２６】
前記単動―複動回路セレクタバルブ２７は、前記クランプ部４３の設置箇所よりも高所側で、かつ作業機配管配設区域３７に亘って覆うマシンキャブの屋根４０の裏面に近接する高さ位置に設置されており、その設置位置に面した前記屋根４０には開口窓４７が設けられている。そして、前記単動―複動回路セレクタバルブ２７の切換操作部２９がこの開口窓４７に臨むように、単動―複動回路セレクタバルブ２７が設置されている。
【００２７】
図５に示すように、単動―複動回路セレクタバルブ２７は、そのバルブケーシング４８に、付属アクチュエータ制御弁２６から渡し込まれた付属アクチュエータ用油圧ホース１６，１８を接続する油圧ホース接続口金４９、５０と、作業機側の付属アクチュエータ２８に向けて上部旋回体外部へ渡し出す付属アクチュエータ用油圧ホース１７，１９を接続する油圧ホース接続口金５１、５２と、付属アクチュエータ２８からの戻り油を付属アクチュエータ制御弁２６を経由せずにタンクへドレーンさせるドレーンホース３２の接続口金５３とを有している。
【００２８】
そして、前記シリンダ制御弁群設置区域３６内の高所に設置した付属アクチュエータ制御弁２６と、前記作業機用油圧配管配設区域３７のマシンキャブの屋根４０の裏面付近に設置した単動―複動回路セレクタバルブ２７との間に、前記付属アクチュエータ用油圧ホース１６，１８を上方の屋根３９，４０や下方の上部旋回体フレームから離した空中位置に布設している。さらに、単動―複動回路セレクタバルブ２７から付属アクチュエータ２８に渡し出す付属アクチュエータ用油圧ホース１７，１９を、前記標準作業具用の各油圧ホース１０〜１５と一緒にして、前記クランプ部４３を経由して前記油圧ホース出口４６に向かわせ、作業機側のブーム４４、アーム４５、作業具等へ布設している。
【００２９】
本発明は以上説明したような、作業機の付属油圧回路に属する単動―複動回路セレクタバルブの設置構造にしたから、以下の効果を奏する。
【００３０】
単動―複動回路セレクタバルブを、上部旋回体内部の上部空間であるマシンキャブ屋根の裏面付近に配設するようにしたから、従来のように上部旋回体下部回りの周壁の近傍に単動―複動回路セレクタバルブを設置するのに比して、内部の搭載機器に邪魔されずに上部旋回体カバー前面部の油圧ホース出口に近接した位置に設置することが容易に可能になった。また、単動―複動回路セレクタバルブを油圧ホース出口に近接した位置に設置することにより、付属アクチュエータ制御弁から単動―複動回路セレクタバルブを経由して油圧ホース出口まで布設する付属アクチュータ用油圧ホースを、油圧ホース出口に対して遠回りにすることなく略最短で配設できるので、付属アクチュータ用油圧ホースの長さを短縮できる。
【００３１】
さらに、単動―複動回路セレクタバルブを、油圧ホース出口を有する作業機油圧配管配設区域内に設置することにより、油圧ホース出口に近接した位置に設置することが可能となり、付属アクチュエータ用ホースの配管を標準作業具用ホースの配管と同じ経路に布設できる。よって、作業機配管の布設経路が統一されて整然とした配管が可能になる。これにより、整備性を向上できる。
【００３２】
さらにまた、付属作業具のアクチュエータ制御弁を、上下方向に積み重ねて設置した作業機用シリンダ制御弁群の最上段位置に設置し、単動―複動回路セレクタバルブをマシンキャブ屋根の裏面付近に設置したから、付属作業具のアクチュエータ制御弁と単動―複動回路セレクタバルブが共に高所に配設されることになって、両者間を接続する付属アクチュエータ用油圧ホースを上方の屋根や下方の上部旋回体フレームから離した空中位置に配設することができる。従って、従来のように上部旋回体内部の下部側に搭載機器類の間を縫って該ホースを布設するのに比して、非常に容易にホースの布設ができると共に、遠回りでなく略真っ直ぐに布設できるからホース長さを短縮化できる。
【００３３】
また、単動―複動回路セレクタバルブの切換操作部を、マシンキャブの屋根に形成した開口窓に臨ませ、該切換操作部をマシンキャブ外部に露出させるようにしたから、傍ら近くに寄らなくても単動―複動回路セレクタバルブの切換状態の確認が容易にでき、またその切換操作も容易にできる。またさらに、この開口窓は、運転室側方の作業機用油圧配管配設区域（マシンキャブ）の屋根に形成されているので、単動―複動回路セレクタバルブの切換状態の確認が運転室内からも容易にできる。
【図面の簡単な説明】
【図１】単動―複動回路セレクタバルブを有する作業機の油圧回路図である。
【図２】油圧ショベルの上部旋回体の上面図である。
【図３】実施形態に係る油圧ショベル上部旋回体の要部平面図である。
【図４】図３の要部側面図である。
【図５】図４の要部正面図である。
【図６】従来の付属作業具油圧回路の説明図である。
【符号の説明】
１０、１１…ブームシリンダ用油圧ホース、１２、１３…アームシリンダ用油圧ホース、１４、１５…バケットシリンダ用油圧ホース、１６、１７，１８，１９…付属アクチュエータ用油圧ホース、２０…ブームシリンダ制御弁、２１…アームシリンダ制御弁、２２…バケットシリンダ制御弁から、２３…ブームシリンダ、２４…アームシリンダ、２５…バケットシリンダ、２６…付属アクチュエータ制御弁、２７…単動―複動回路セレクタバルブ、２８…付属アクチュエータ、２９…切換操作部、３０…タンク、３１…アキュームレータ、３２…タンク戻り回路、３３…油圧ポンプ、３４…マシンキャブ、３５…エンジン設置区域、３６…シリンダ制御弁群設置区域、３７…作業機配管配設区域、３８、３９…キャブ屋根、４０…固定屋根、４１…作動油タンク、４２…バッテリ、４３…クランプ部、４４…ブーム、４５…アーム、４６…油圧ホース出口、４７…開口窓、４８…バルブケーシング、４９、５０、５１，５２…油圧ホース接続口金、５３…ドレーンホース接続口金、５４…付属アクチュエータ制御弁、５５、５６…付属作業具用油圧ホース、５７…単動―複動回路セレクタバルブ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic excavator in which an upper swing body having a work machine attached to the front part is mounted on a lower traveling body so as to be able to turn, and an auxiliary work for driving an auxiliary work tool to be attached to the tip of the work machine in a replaceable manner. The present invention relates to an installation structure of a single-action / double-action circuit selector valve that can selectively switch a tool hydraulic circuit to a single-action type or a double-action type.
[0002]
[Prior art]
In a hydraulic excavator in which an upper swinging body having a boom, an arm, and a work implement having a work tool connected to be movable up and down is attached to the front part of the upper swinging body so as to be swingable on the lower traveling body, the tip of the arm A standard working tool to be attached (for example, a bucket) is removed, and an attached working tool such as a breaker working tool capable of crushing work or a crusher working tool capable of crushing work can be replaced and used.
[0003]
FIG. 6 shows an attached work tool hydraulic circuit for driving the attached work tool. The attached work tool hydraulic circuit includes an attached actuator control valve 54 for controlling an attached actuator (a hydraulic cylinder in the case of a breaker work tool, a hydraulic motor in the case of a crusher work tool) provided in the attached work tool. In addition, hydraulic hoses 55 and 56 for auxiliary work tools on the reciprocating path from the control valve 54 are laid along the boom 44 and the arm 45. Corresponding to the drive system of the attached actuator (breaker work tool: single-acting type, crusher work tool: double-acting type), the attached work tool hydraulic circuit is either single-acting or double-acting Therefore, a single-action / double-action circuit selector valve 57 is interposed in the circuit of the hydraulic hose 56 for the accessory tool on the return path.
[0004]
The single-acting / double-acting circuit selector valve 57 is usually installed inside the upper swing structure, and the drive circuit for switching the single-acting / double-acting circuit selector valve 57 from the outside of the upper swing structure is switched to. In order to make it easier to check whether the drive circuit is switched to the required drive circuit, the single-action / double-action circuit selector valve 57 is moved to a position near the opening window provided on the peripheral wall of the upper swing frame. Arranged. (For example, see Patent Document 1)
[0005]
In addition, hydraulic hoses for cylinders of standard work tools such as booms, arms, buckets, etc. are connected to the hydraulic hose outlets for work implements (hereinafter referred to as “work machine hydraulic hose outlets”) formed on the front cover of the machine cab from the cylinder control valves installed in the upper swing body. The auxiliary work tool hydraulic hoses 55 and 56 are also connected from the single-acting / double-acting circuit selector valve 57 via the hydraulic hose outlet. It is laid on the work machine side.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-271377 (page 3, FIG. 1-2, FIG. 6)
[0007]
[Problems to be solved by the invention]
However, the conventional single-action / double-action circuit selector valve installation structure as described above has the following problems.
As described above, in order to easily check the switching state of the single-action / double-action circuit selector valve 57 installed in the upper swing body and to perform the switching operation from the outside of the upper swing body, The moving circuit selector valve 57 is installed at an internal position in the vicinity of the peripheral wall below the upper swing body. For this reason, the installation position is remote from the hydraulic hose outlet provided in the front cover of the machine cab of the upper swing body.
Therefore, the piping of the accessory work hydraulic hose 56 laid from the attached actuator control valve 54 via the single action-double action circuit selector valve 57 is routed to the front work tool hydraulic hose outlet. Thus, there is a problem that the piping of the hydraulic hose for the attached work tool becomes long. In addition, there is a problem in that it is difficult to install the hydraulic hose for the attached work tool in a narrow space inside the upper swing body so as to avoid the mounted devices therein. Furthermore, since the installation path of the hydraulic hose for the accessory work tool from the inside of the upper swing body to the hydraulic hose outlet is different from the installation path of the hydraulic hose for the standard work tool for booms, arms, and buckets, There is also a problem that these hydraulic hoses are laid in a messy state, and maintainability is impaired.
[0008]
The present invention pays attention to the above-mentioned problems, and it is possible to shorten the piping length of the hydraulic hose for the accessory work tool of the working machine of the hydraulic excavator, and the installation of the hydraulic hose is easy, and the piping state as a whole is orderly. It aims at providing the installation structure of the single action-double action circuit selector valve of the attached work implement hydraulic circuit obtained.
[0009]
[Means for Solving the Problems]
To achieve the above object, according to a first aspect of the present invention, there is provided an attached actuator control valve for controlling an attached work tool attached to a front end portion of a work machine attached to a front portion of an upper swing body, and the attached actuator control. A single-acting-double-acting circuit selector valve that can selectively switch the attached working tool hydraulic circuit including the valve to either single acting or double acting is installed inside the machine cab of the upper swing body, The hydraulic hose for the work machine cylinder that drives the work machine and the hydraulic hose for the attached actuator from the single-action / double-action circuit selector valve are sent to the work machine side via the hydraulic hose outlet formed in the machine cab cover. In the hydraulic excavator constructed as described above, the single-acting-double-acting circuit selector valve is installed near the back surface of the roof of the machine cab, and the single excavation of the roof of the machine cab is performed. - the portion facing the double-acting circuit selector valve has a structure in which opening the opening window.
[0010]
According to the first invention, since the single-action / double-action circuit selector valve is arranged near the back surface of the machine cab roof, which is the upper space inside the upper swing body, there is no equipment mounted inside the upper swing body. The valve can be installed in an empty space. For this reason, it is easy to install a single-action / double-action circuit selector valve at a position close to the hydraulic hose outlet of the machine cab cover for passing the hydraulic hose for work equipment including the hydraulic hose for the attached actuator. It becomes possible. As a result, the hydraulic hose for attached actuator can be laid almost straight toward the hydraulic hose outlet, so that the hose length can be shortened. Moreover, since the opening window is opened in the part of the roof of the machine cab facing the single-acting / double-acting circuit selector valve, the switching operation and the switching position of the single-acting / double-acting circuit selector valve can be confirmed.
[0011]
According to a second invention, in the first invention, the single-action / double-action circuit selector valve is installed at a position close to the hydraulic hose outlet.
[0012]
According to the second aspect of the present invention, by installing the single-acting / double-acting circuit selector valve in a position close to the hydraulic hose outlet, it is possible to lay the hose pipe for the accessory work tool actuator in the same path as the hose pipe for the standard work tool. Therefore, since the laying route of the work machine piping is unified and the piping becomes orderly, maintainability can be improved.
[0013]
Further, the third invention is the working machine cylinder according to the second invention, wherein the attached actuator control valve for extending the attached actuator hose connected to the single-acting / double-acting circuit selector valve is vertically stacked in the upper swing body. The control valve is installed at the uppermost position, and the attached actuator hose is laid in the air and connected to the single-action / double-action circuit selector valve.
[0014]
According to the third invention, since the attached actuator control valve is installed at the uppermost position of the cylinder control valve group for work implements stacked in the vertical direction, the attached actuator control valve is installed near the back surface of the machine cab roof. Between the single-acting-double-acting circuit selector valve, the attached actuator hose can be disposed at an aerial position away from the upper roof and the lower frame. Therefore, the hose can be laid very easily and can be laid substantially straight as compared with the conventional case where the attached actuator hose is laid by sewing between the mounted devices on the lower side inside the upper swing body. The hose length can be shortened.
[0015]
According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the single-acting / double-acting circuit selector valve is arranged so that a switching operation portion of the valve faces the opening window.
[0016]
According to the fourth invention, since the switching operation portion of the single-acting / double-acting circuit selector valve is made to face the opening window, the switching operation portion is exposed to the outside, and the switching state from the outside of the machine cab is confirmed. Switching operation can be easily performed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.
[0018]
As shown in the hydraulic circuit diagram of FIG. 1, the work machine piping includes boom cylinder hydraulic hoses 10 and 11, arm cylinder hydraulic hoses 12 and 13, and bucket cylinder hydraulic hoses 14 and 15 belonging to the standard work implement hydraulic circuit. And hydraulic hoses 16, 17, 18, 19 for attached actuators belonging to the attached work implement hydraulic circuit. Each of the hydraulic hoses 10-15 belonging to the standard work implement hydraulic circuit includes a boom cylinder control valve 20, an arm cylinder control valve 21, and a bucket cylinder control valve 22, a boom cylinder 23, an arm cylinder 24, and a bucket cylinder 25. Are connected respectively. The attached actuator hydraulic hoses 16 to 19 belonging to the attached work implement hydraulic circuit are connected from the attached actuator control valve 26 to the attached actuator 28 via the single action-double action circuit selector valve 27.
[0019]
The single-acting-double-acting circuit selector valve 27 includes a single-acting circuit switching position A used for a breaker working tool, a double-acting circuit switching position B used for a crusher working tool, both single-acting circuit switching positions A, and And a switching operation unit 29 that can be manually switched between the double-acting circuit switching positions B.
[0020]
When switched to the single-acting circuit switching position A, the pressure oil from the attached actuator control valve 26 is supplied to the breaker via the one-side attached actuator hydraulic hoses 16 and 17 which are forward circuits, and from the breaker. The return oil returns to the tank return circuit 32 including the accumulator 31 via the other side attached actuator hydraulic hose 19 which is a return circuit, and is drained to the tank 30.
[0021]
When switching to the double-acting circuit switching position B, the attached actuator hydraulic hoses 16, 17, 18 and 19 which are the forward circuit and the return circuit are connected to the attached actuator control valve 26, and by switching the attached actuator control valve 26, The forward circuit and the return circuit are selectively connected to the hydraulic pump 33 and the tank 30.
The switching operation unit 29 has a display mark (not shown) for displaying a switching position between the breaker working tool and the crusher working tool, so that it can be easily confirmed from outside the switching position. It is.
[0022]
FIG. 2 shows the hydraulic hoses 10-15 for the working machine cylinder, the hydraulic hoses 16-19 for the attached actuators, the cylinder control valves 20-22, the attached actuator control valve 26, and the double-acting circuit selector valve 27. The top view of the hydraulic shovel arrange | positioned inside an upper revolving body is shown. The hydraulic excavator has a machine cab 34 that entirely surrounds the mounting range of devices mounted on the upper swing body. The machine cab 34 is divided into an engine installation area 35 at the rear of the upper swing body, a cylinder control valve group installation area 36 on the right side, and a work machine piping installation area 37 at the center. The cylinder control valve group installation area 36 is covered with cab roofs 38 and 39 that can be opened and closed, and the work machine piping arrangement area 37 is covered with a roof 40 that is detachably provided. A cab 60 is installed at the front left side of the upper swing body.
[0023]
In the cylinder control valve group installation area 36, as shown in FIG. 3, a hydraulic oil tank 41, a battery 42, each cylinder control valve 20-22 belonging to the standard work implement hydraulic circuit, and an accessory belonging to the attached work implement hydraulic circuit. An actuator control valve 26 is installed. Further, in the work machine piping arrangement area 37, the single-acting / double-acting circuit selector valve 27, the hydraulic hoses 10-15 belonging to the standard work implement hydraulic circuit, and the attached actuator hydraulic hoses 16-19 are respectively provided. It is laid.
[0024]
In the cylinder control valve group installation area 36, as shown in FIGS. 4 and 5, a boom cylinder control valve 20, an arm cylinder control valve 21, and a bucket cylinder control valve 22 for standard working tools are stacked in order from the bottom. The attached actuator control valve 26 is placed at the uppermost position. Then, the hydraulic hoses 10 to 15 for the standard working tools and the hydraulic hoses 16 and 18 for the attached actuators respectively coming out from the cylinder control valves 20 to 22 and the attached actuator control valve 26 are laid in the same path, and adjacent work It passes into the machine hydraulic piping arrangement area 37.
[0025]
As shown in FIGS. 4 and 5, the single acting / double acting circuit selector valve 27 and the clamp portion 43 are provided in the work machine piping arrangement area 37, and cover the arrangement area 37. A hydraulic hose outlet 46 is formed in the front cover of the machine cab roof 40. The single action-double action circuit selector valve 27 is installed at a position close to the hydraulic hose outlet 46. The clamp portion 43 is provided for the hydraulic hoses 10 to 15 for the standard working tool passed from the cylinder control valve group installation area 36 and for the attached actuators that are output from the single-action / double-action circuit selector valve 27. The hydraulic hoses 17 and 19 are bundled to converge. The hydraulic hoses 10 to 15, 17, and 19 are sent out to the working machine side outside the upper swing body through the hydraulic hose outlet 46.
[0026]
The single-acting-double-acting circuit selector valve 27 is at a height higher than the place where the clamp portion 43 is installed and close to the back surface of the roof 40 of the machine cab covering the work machine piping installation area 37. The roof 40 facing the installation position is provided with an opening window 47. The single action-double action circuit selector valve 27 is installed so that the switching operation portion 29 of the single action-double action circuit selector valve 27 faces the opening window 47.
[0027]
As shown in FIG. 5, the single-action / double-action circuit selector valve 27 has a hydraulic hose connection base 49 for connecting the attached actuator hydraulic hoses 16 and 18 passed from the attached actuator control valve 26 to its valve casing 48. , 50, hydraulic hose connection caps 51 and 52 for connecting the hydraulic hoses 17 and 19 for the attached actuator to be transferred to the outside of the upper swing body toward the attached actuator 28 on the work machine side, and return oil from the attached actuator 28 are attached. It has a connection cap 53 of a drain hose 32 that drains to the tank without passing through the actuator control valve 26.
[0028]
Then, the attached actuator control valve 26 installed at a high place in the cylinder control valve group installation area 36 and the single-acting-multiple installation installed near the back surface of the machine cab roof 40 in the working machine hydraulic piping installation area 37. Between the moving circuit selector valve 27, the attached actuator hydraulic hoses 16 and 18 are installed at an aerial position away from the upper roofs 39 and 40 and the lower upper swing frame. Further, the attached actuator hydraulic hoses 17 and 19 delivered from the single-acting / double-acting circuit selector valve 27 to the attached actuator 28 together with the hydraulic hoses 10 to 15 for the standard working tool are used to Via the hydraulic hose outlet 46, the boom 44, the arm 45, the work tool and the like on the work machine side are installed.
[0029]
Since the present invention has the single-action / double-action circuit selector valve installation structure belonging to the hydraulic circuit attached to the working machine as described above, the following effects can be obtained.
[0030]
The single-acting-double-acting circuit selector valve is arranged near the back of the machine cab roof, which is the upper space inside the upper swing body. -Compared to installing a double-acting circuit selector valve, it is now possible to easily install it at a position close to the hydraulic hose outlet on the front of the upper revolving structure cover without being obstructed by internal equipment. In addition, by installing a single-action / double-action circuit selector valve in a position close to the hydraulic hose outlet, the attached actuator is installed from the attached actuator control valve to the hydraulic hose outlet via the single-action / double-action circuit selector valve. Since the hydraulic hose can be arranged in the shortest distance without making a detour with respect to the hydraulic hose outlet, the length of the hydraulic hose for the attached actuator can be shortened.
[0031]
In addition, by installing the single-acting-double-acting circuit selector valve in the working machine hydraulic piping installation area with the hydraulic hose outlet, it is possible to install it at a position close to the hydraulic hose outlet. Can be installed in the same path as the standard work tool hose pipe. Therefore, the laying route of the work machine piping is unified, and orderly piping becomes possible. Thereby, maintainability can be improved.
[0032]
In addition, the actuator control valves of the attached work implements are installed at the uppermost position of the cylinder control valve group for work implements stacked in the vertical direction, and the single-action / double-action circuit selector valve is located near the back of the machine cab roof. Because it is installed, both the actuator control valve and the single-action / double-action circuit selector valve of the accessory work tool are installed at a high place, and the hydraulic hose for the attached actuator that connects between them is installed on the upper roof and below It can be arranged at an aerial position away from the upper revolving body frame. Therefore, compared to the conventional case where the hose is laid by sewing between the mounted devices on the lower side inside the upper swing body, the hose can be laid very easily, and it is substantially straight rather than roundabout. Hose length can be shortened because it can be laid.
[0033]
In addition, since the switching operation part of the single-acting / double-acting circuit selector valve faces the opening window formed on the roof of the machine cab, the switching operation part is exposed to the outside of the machine cab. However, it is possible to easily check the switching state of the single-acting / double-acting circuit selector valve, and to easily perform the switching operation. Furthermore, since this opening window is formed on the roof of the hydraulic piping arrangement area (machine cab) for the work machine on the side of the cab, the switching state of the single-acting / double-acting circuit selector valve can be confirmed. Easily.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram of a working machine having a single-action / double-action circuit selector valve.
FIG. 2 is a top view of an upper swing body of a hydraulic excavator.
FIG. 3 is a plan view of an essential part of the excavator upper swing body according to the embodiment.
4 is a side view of the main part of FIG. 3;
5 is a front view of the main part of FIG. 4. FIG.
FIG. 6 is an explanatory diagram of a conventional attached work implement hydraulic circuit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10, 11 ... Boom cylinder hydraulic hose, 12, 13 ... Arm cylinder hydraulic hose, 14, 15 ... Bucket cylinder hydraulic hose, 16, 17, 18, 19 ... Attached actuator hydraulic hose, 20 ... Boom cylinder control valve , 21 ... Arm cylinder control valve, 22 ... Bucket cylinder control valve, 23 ... Boom cylinder, 24 ... Arm cylinder, 25 ... Bucket cylinder, 26 ... Attached actuator control valve, 27 ... Single acting-double acting circuit selector valve, 28 Attached actuator, 29, switching operation unit, 30 ... tank, 31 ... accumulator, 32 ... tank return circuit, 33 ... hydraulic pump, 34 ... machine cab, 35 ... engine installation area, 36 ... cylinder control valve group installation area, 37 ... work equipment piping installation area, 38, 39 ... cab roof, 40 ... fixed roof DESCRIPTION OF SYMBOLS 41 ... Hydraulic oil tank, 42 ... Battery, 43 ... Clamp part, 44 ... Boom, 45 ... Arm, 46 ... Hydraulic hose exit, 47 ... Opening window, 48 ... Valve casing, 49, 50, 51, 52 ... Hydraulic hose connection Base, 53 ... Drain hose connection base, 54 ... Attached actuator control valve, 55, 56 ... Hydraulic hose for attached working tool, 57 ... Single acting-double acting circuit selector valve.

Claims (4)

上部旋回体の前部に取り付けた作業機の先端部に装着される付属作業具を制御する付属アクチュエータ制御弁(26)と、該付属アクチュエータ制御弁(26)を含む付属作業具油圧回路を単動式及び複動式のいずれか一方に選択的に切り換え可能とする単動―複動回路セレクタバルブ(27)とを上部旋回体のマシンキャブ内部に設置し、前記作業機を駆動する作業機シリンダ用の油圧ホース、及び前記単動―複動回路セレクタバルブ(27)からの付属アクチュエータ用油圧ホース(16〜19)をマシンキャブカバーに形成した油圧ホース出口(46)を経由して作業機側に送り込むようにした油圧ショベルにおいて、
前記単動―複動回路セレクタバルブ(27)を、マシンキャブの屋根(40)の裏面付近に設置すると共に、
前記マシンキャブの屋根(40)の前記単動―複動回路セレクタバルブ(27)に面した部位に、開口窓(47)を開けた
ことを特徴とする付属作業具油圧回路の単動―複動回路セレクタバルブの設置構造。An auxiliary actuator control valve (26) for controlling an auxiliary work tool attached to the front end of the work machine attached to the front of the upper swing body, and an auxiliary work tool hydraulic circuit including the auxiliary actuator control valve (26) are simply provided. A single-action / double-acting circuit selector valve (27) that can be selectively switched to either a moving type or a double-acting type is installed in the machine cab of the upper swing body and drives the working machine. Working machine via a hydraulic hose outlet (46) formed in the machine cab cover with a hydraulic hose for cylinder and the attached actuator hydraulic hose (16-19) from the single-acting-double-acting circuit selector valve (27) In a hydraulic excavator that is fed to the side,
The single-acting-double-acting circuit selector valve (27) is installed near the back of the machine cab roof (40),
A single action-double action of the attached work implement hydraulic circuit, wherein an opening window (47) is opened in a portion of the roof (40) of the machine cab facing the single action-double action circuit selector valve (27). Dynamic circuit selector valve installation structure. 前記単動―複動回路セレクタバルブ(27)が、前記油圧ホース出口(46)に近接した位置に設置された
ことを特徴とする請求項１記載の付属作業具油圧回路の単動―複動回路セレクタバルブの設置構造。The single-acting-double-acting function of the attached work implement hydraulic circuit according to claim 1, wherein the single-acting-double-acting circuit selector valve (27) is installed in a position close to the hydraulic hose outlet (46). Circuit selector valve installation structure. 前記単動―複動回路セレクタバルブ(27)に接続する付属アクチュエータホース(16,18)を出す付属アクチュエータ制御弁(26)を、上部旋回体内部に上下方向に積み重ねて設置した作業機用シリンダ制御弁(21,22)の最上段位置に設置し、
前記付属アクチュエータホース(16,18)を空中に布設して前記単動―複動回路セレクタバルブ(27)に接続した
ことを特徴とする請求項２記載の付属作業具油圧回路の単動―複動回路セレクタバルブの設置構造。Cylinder for work machine in which the attached actuator control valve (26) that brings out the attached actuator hose (16, 18) connected to the single action-double action circuit selector valve (27) is vertically stacked inside the upper swing body Installed at the uppermost position of the control valve (21, 22)
3. The single-actuate-double-function hydraulic circuit of the accessory work tool according to claim 2, wherein the attached actuator hose (16, 18) is laid in the air and connected to the single-actual-double-acting circuit selector valve (27). Dynamic circuit selector valve installation structure. 前記単動―複動回路セレクタバルブ(27)を、該バルブ(27)の切換操作部(29)が前記開口窓(47)に臨むように配設した
ことを特徴とする請求項１，２又は３記載の付属作業具油圧回路の単動―複動回路セレクタバルブの設置構造。The single-acting-double-acting circuit selector valve (27) is arranged such that a switching operation portion (29) of the valve (27) faces the opening window (47). Or the installation structure of the single action-double action circuit selector valve of the attached work implement hydraulic circuit of 3 description.
JP2002280024A 2002-09-25 2002-09-25 Installation structure of single-acting-double-acting circuit selector valve of hydraulic circuit attached to hydraulic excavator Expired - Fee Related JP3963317B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2002280024A JP3963317B2 (en) 2002-09-25 2002-09-25 Installation structure of single-acting-double-acting circuit selector valve of hydraulic circuit attached to hydraulic excavator
CNB031580513A CN1233905C (en) 2002-09-25 2003-09-04 Setting-up structure of hydraulic return single acting-double acting selective valve for digger working appliances
KR1020030064887A KR100977240B1 (en) 2002-09-25 2003-09-18 Work machine for excavator

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JP2002280024A JP3963317B2 (en) 2002-09-25 2002-09-25 Installation structure of single-acting-double-acting circuit selector valve of hydraulic circuit attached to hydraulic excavator

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KR101435198B1 (en) * 2007-12-17 2014-08-29 두산인프라코어 주식회사 Apparatus fur supplying oil pressure supply for use with machine tool
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