JP3437067B2 - Oil passage structure of construction machinery - Google Patents
Oil passage structure of construction machineryInfo
- Publication number
- JP3437067B2 JP3437067B2 JP24937297A JP24937297A JP3437067B2 JP 3437067 B2 JP3437067 B2 JP 3437067B2 JP 24937297 A JP24937297 A JP 24937297A JP 24937297 A JP24937297 A JP 24937297A JP 3437067 B2 JP3437067 B2 JP 3437067B2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- oil
- return
- return oil
- hydraulic actuator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、油圧タンクと作動
油フィルタを備えた油圧ショベル等の建設機械の油路構
造に関する。
【０００２】
【従来の技術】図７は、油圧ショベルに装備されている
従来技術の一実施例戻り油回路の要部油路構成を示す図
である。例えば打撃装置等（いわゆる油圧ブレーカと呼
ばれる油圧破砕機などを含む）の脈動を発生しやすい油
圧アクチュエータを備えた油圧ショベルでは図７のよう
な油路構成を採用している。すなわち、例えばブーム用
シリンダ、アーム用シリンダ、走行モータ、旋回モータ
等の比較的戻り油に脈動を生じ難い静圧型油圧アクチュ
エータ（静圧型油圧アクチュエータの図示はしていな
い）からの戻り油油路４０a ，−−−，４０n と、打撃
装置等の脈動を生じ易い脈動型油圧アクチュエータ（脈
動型油圧アクチュエータの図示はしていない）からの戻
り油油路４１とを、作動油フィルタ室４２と静圧型油圧
アクチュエータからの戻り油油路４０a ，−−−，４０
n とを油路接続する配管接続手段より上流側で合流させ
ている。また、戻り油用の配管は油圧機器の配置の影響
で長くなることがあり、この為作動油フィルタの戻り油
流入口４３への取付位置に誤差が生じ易く、この誤差を
吸収しつつ接続するために配管接続手段として通常カッ
プリングと呼ばれる差込締付け型の継ぎ手４４が使用さ
れる。なお符号１は、作動油タンクである。
【０００３】また図８は従来技術の他実施例戻り油回路
の要部油路構成を示す図であるが、図８のような油路構
成を採用している場合もある。すなわち、例えばブーム
用シリンダ、アーム用シリンダ、走行モータ、旋回モー
タ等の比較的戻り油に脈動を生じ難い静圧型油圧アクチ
ュエータからの戻り油油路４０’とこれに接続される作
動油フィルタ室４２’と、打撃装置等の脈動を生じ易い
脈動型油圧アクチュエータからの戻り油油路４１’とこ
れに接続される作動油フィルタ室４５を別個に設け、そ
れぞれ別個に作動油タンク１’に戻り油を流入させるよ
うにしたものである。
【０００４】
【発明が解決しようとする課題】図７に示す従来の技術
では、脈動を伴う脈動型油圧アクチュエータからの戻り
油が配管接続手段の上流側で、脈動を伴わない静圧型油
圧アクチュエータからの戻り油と合流されるため、油圧
脈動により前記配管接続手段（継ぎ手４４）の接続状態
が外れるという不具合が発生する可能性があった。また
この油圧脈動が静圧型油圧アクチュエータに伝播して作
動不具合を起こす可能性があった。
【０００５】図８は図７のような不具合を解消するため
に、脈動型油圧アクチュエータからの戻り油を、静圧型
油圧アクチュエータからの戻り油が流入する作動油フィ
ルタ室４２’とは別に設けたものである。図８の構成に
よれば、図７のような不具合は発生しないものの、別個
に専用の作動油フィルタ室４５及び作動油フィルタ（図
示していない）を設ける必要があり、機器構成が複雑化
し、製作費が高価になり、また２つの作動油フィルタに
対してメンテナンスの必要が生じるためメンテナンス性
が悪化するという図７のものとは別の不具合を発生させ
ていた。
【０００６】
【課題を解決するための手段】本発明では、油圧ポンプ
と、前記油圧ポンプからの吐出油により駆動され、戻り
油に脈動を伴わない静圧型油圧アクチュエータと、前記
油圧ポンプからの吐出油により駆動され、戻り油に脈動
を伴う脈動型油圧アクチュエータと、前記静圧型油圧ア
クチュエータ及び脈動型油圧アクチュエータからの戻り
油が流入する作動油フィルタ室と、前記作動油フィルタ
室内に配置された作動油フィルタと、前記作動油フィル
タ室を通過した戻り油が流入する作動油タンクとを有
し、前記作動油フィルタ室には前記静圧型油圧アクチュ
エータからの戻り油流入口と前記脈動型油圧アクチュエ
ータからの戻り油流入口とを形成するとともに前記脈動
型油圧アクチュエータからの戻り油圧流入口に対面しな
い位置に前記作動油フィルタを配置した。この構成によ
れば、一つの作動油フィルタ室に静圧型油圧アクチュエ
ータからの戻り油と脈動型油圧アクチュエータからの戻
り油を直接流入させるため、静圧型油圧アクチュエータ
と作動油フィルタ室の戻り油流入口とを接続する配管接
続手段に、脈動型油圧アクチュエータからの戻り油の油
圧脈動が作用せず、配管接続手段の接続状態が外れるよ
うな不具合は発生しないし、作動油フィルタ室及び作動
油フィルタが一つで済むため、機器構成の複雑化や、メ
ンテナンス性の悪化を招くことはない。また、比較的容
積の大きい作動油フィルタ室に脈動を伴う脈動型油圧ア
クチュエータからの戻り油が直接流入するため、戻り油
の脈動は減衰沈静化し静圧型油圧アクチュエータの作動
へ悪影響を及ぼすことはない。
【０００７】しかも、前記脈動型油圧アクチュエータか
らの戻り油流入口に対面しない位置に前記作動油フィル
タを配置しているため、脈動型油圧アクチュエータから
の戻り油の脈動圧が作動油フィルタに直接的に作用する
ことによる作動油フィルタの破損や変形も防止すること
ができる。
【０００８】
【０００９】
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて詳細に説明する。図１は、本発明の一実施形
態の油路構造７を示す平面図である。図において、８は
図示していない油圧ショベルに装備されている作動油タ
ンク、９は油圧回路から環流する戻り油に混入する汚損
物質を除去するために前記作動油タンク８の内部に設け
られ前記戻り油が流入する作動油フィルタ室（通常、リ
ターンフィルタと呼ばれている）、１０は作動油フィル
タ室９の上部カバー、１１はケース、１２は作動油フィ
ルタ室９内に配置された濾過部材である作動油フィルタ
（通常、フィルタエレメントと呼ばれている）、１３は
戻り油が脈動を伴わない静圧型油圧アクチュエータ（図
示していない）からの戻り油油路（後述する）を接続す
るタンク側接続部、１４はタンク側接続部１３とケース
１１内部の戻り油流入室１６とを連通せしめる油管、１
７は油管１４が前記ケース１１内に開口している戻り油
流入口、１８は戻り油が脈動を伴う脈動型油圧アクチュ
エータ（後述する）からの戻り油油路（後述する）を接
続するタンク側接続部、１９はタンク側接続部１８とケ
ース１１内部の戻り油流入室１６とを連通せしめる油
管、２０は油管１９が前記ケース１１内に開口している
戻り油流入口、２１は油圧ポンプ（後述する）対して作
動油タンク８内の作動油が吸込まれる際にこの作動油を
濾過するサクションフィルタ、２２はサクションフィル
タ２１の上部カバーである。図２は、図１のＡ−Ａより
見た要部たて断面図である。図において、２３は作動油
フィルタ１２をケース１１の内部下方に固定する付勢力
をはたらかせているスプリングである。図３は、図２の
Ｂより見た要部側面図である。
【００１０】次に図４は、本発明の一実施形態の油路構
造７をそなえた油圧ショベル（図示していない）の要部
油圧回路図である。図において、２４は戻り油が脈動を
伴う油圧アクチュエータである例えば打撃装置等のうち
の油圧破砕機（通常、油圧ブレーカと呼ばれている）、
２５は油圧破砕機２４用の油圧切換弁、２６は油圧破砕
機２４操作用の油圧リモコン弁、２７，２８は油圧ショ
ベルに装備され戻り油が脈動を伴わない複数個の油圧ア
クチュエータ（図示していない）をそれぞれ制御する方
向切換弁（２個の方向切換弁２７，２８だけを代表例と
して記載している）、２９はメイン圧油を吐出する油圧
ポンプ、３０はパイロット油圧源であるパイロットポン
プ、３１はカット弁、３２，３３はそれぞれ戻り油用管
路である。
【００１１】次に、本発明の一実施形態の油路構造７の
構成を図１〜図４について述べる。本実施形態の油路構
造７では、油圧ポンプ２９と、前記油圧ポンプ２９から
の吐出油により駆動され、戻り油に脈動を伴わない静圧
型油圧アクチュエータ（図示していない例えばブーム用
シリンダ、アーム用シリンダ、走行モータ、旋回モータ
等の油圧アクチュエータをいう）と、前記油圧ポンプ２
９からの吐出油により駆動され，戻り油に脈動を伴う脈
動型油圧アクチュエータ（例えば図４に示す油圧破砕機
２４のような打撃装置等をいう）と、前記静圧型油圧ア
クチュエータ及び脈動型油圧アクチュエータからの戻り
油が流入する作動油フィルタ室９と、前記作動油フィル
タ室９内に配置された作動油フィルタ１２と、前記作動
油フィルタ室９を通過した戻り油が流入する作動油タン
ク８を有し、前記作動油フィルタ室９には前記静圧型油
圧アクチュエータからの戻り油流入口１７と前記脈動型
油圧アクチュエータからの戻り油流入口２０とを形成し
た。
【００１２】次に、本発明の一実施形態の油路構造７の
作用について述べる。本実施形態の油路構造７の構成に
よれば、一つの作動油フィルタ室９に静圧型油圧アクチ
ュエータからの戻り油と脈動型油圧アクチュエータから
の戻り油を直接流入させるため、静圧型油圧アクチュエ
ータと作動油フィルタ室９の戻り油流入口１７とを接続
する配管接続手段（図４に示すタンク側接続部１３に対
して連結される配管接続手段であるが図示していない）
に、脈動型油圧アクチュエータからの戻り油の油圧脈動
が作用せず、配管接続手段の接続状態が外れるような不
具合は発生しないし、作動油フィルタ室９及び作動油フ
ィルタ１２が一つで済むため、機器構成の複雑化や、メ
ンテナンス性の悪化を招くことはない。また、比較的容
積の大きい作動油フィルタ室９に脈動を伴う脈動型油圧
アクチュエータからの戻り油が直接流入するため、戻り
油の脈動は減衰沈静化し静圧型油圧アクチュエータの作
動へ悪影響を及ぼす事はない。更にまた、前記脈動型油
圧アクチュエータからの戻り油流入口２０に対面しない
ように、図２に示す下方の位置に前記作動油フィルタ１
２を配置したので、脈動型油圧アクチュエータからの戻
り油の脈動圧が作動油フィルタ１２に直接的に作用する
ことにより作動油フィルタ１２の破損や変形が発生する
のを防止することができる。
【００１３】次に図５は、本発明の他実施形態の油路構
造３４を示す要部斜視図である。図において、３５は作
動油タンク、３７は作動油フィルタ室、３８は作動油フ
ィルタ室３７の上部に連結した配管接続手段であるヘッ
ドカバー、３９は作動油フィルタ室３７を車体（図示し
ていない）に対し固定しているブラケット、３２’は脈
動を伴う戻り油が還流してくる戻り油用配管、３３’は
脈動を伴わない戻り油が還流してくる戻り油用配管、５
０は前記作動油フィルタ室３７内にて濾過された戻り油
が作動油タンク３５内に還流するための戻り油用配管、
５１，５２，５３は前記各戻り油用配管３２’，３
３’，５０のそれぞれヘッドカバー側接続金具、５４は
戻り油用配管５０のタンク側接続金具である。図６は、
本発明の他実施形態の油路構造３４をそなえた油圧ショ
ベル（図示していない）の要部油圧回路図である。図に
おいて、図４に示す一実施形態の油路構造７の場合と同
一の構成要素を使用しているものに対しては同符号を付
す。図５及び図６に示す他実施形態の油路構造３４で
は、油圧ポンプ２９と、前記油圧ポンプ２９からの吐出
油により駆動され、戻り油に脈動を伴わない静圧型油圧
アクチュエータ（図示していない例えばブーム用シリン
ダ、アーム用シリンダ、走行モータ、旋回モータ等の油
圧アクチュエータをいう）と、前記油圧ポンプ２９から
の吐出油により駆動され、戻り油に脈動を伴う脈動型油
圧アクチュエータ（例えば図６に示す油圧破砕機２４の
ような打撃装置等をいう）と、前記静圧型油圧アクチュ
エータからの戻り油用配管３３’と、前記脈動型油圧ア
クチュエータからの戻り油用配管３２’と、前記静圧型
油圧アクチュエータ及び脈動型油圧アクチュエータから
の戻り油が流入する作動油フィルタ室３７と、前記作動
油フィルタ室３７内に配置された作動油フィルタ（図示
していない）と、前記静圧型油圧アクチュエータからの
戻り油用配管３３’と前記作動油フィルタとを油路接続
する配管接続手段（ヘッドカバー３８をいう）と、前記
作動油フィルタ室３７を通過した戻り油が流入する作動
油タンク３５とを有し、前記静圧型油圧アクチュエータ
からの戻り油と前記脈動型油圧アクチュエータからの戻
り油が前記配管接続手段（ヘッドカバー３８）と前記作
動油フィルタ室３７との間で合流するようにした。
【００１４】前記他実施形態の油路構造３４の構成によ
れば、従来の作動油フィルタ室に変更を加えることな
く、戻り油流入口に合流手段（ヘッドカバー３８）を設
けるか、或いは戻り油流入口と配管接続手段との間にＴ
字コネクタ（図示していない）等の合流手段を取り付け
ることにより、より容易な構成で配管接続手段の接続状
態が外れるような不具合や、機器構成の複雑化や、メン
テナンス性の悪化という不具合が防止できる。これらの
作用自体は、上述の作動油フィルタ室（図１に示す作動
油フィルタ室９をいう）に静圧型油圧アクチュエータか
らの戻り油流入口と脈動型油圧アクチュエータからの戻
り油流入口とを形成したものに比して小さくなるが、こ
の構成によれば、より安価に、また周辺の機器に変更を
加えることを最小限に押さることができるとともに、既
製の製品に対しても後付け的に適用することができる。
【００１５】
【発明の効果】本発明の建設機械の油路構造によれば、
作動油タンク内に設けられた作動油フィルタ室に対し、
静圧型油圧アクチュエータからの戻り油流入口と脈動型
油圧アクチュエータからの戻り油流入口とを形成し、一
つの作動油フィルタ室に前記静圧型油圧アクチュエータ
からの戻り油と前記脈動型油圧アクチュエータからの戻
り油を直接流入させるとともに前記脈動型油圧アクチュ
エータからの戻り油流入口に対面しない位置に前記作動
油フィルタを配置したため、前記静圧型油圧アクチュエ
ータと前記作動油フィルタ室の戻り油流入口とを接続す
る配管接続手段に、前記脈動型油圧アクチュエータから
の戻り油の油圧脈動が作用せず、配管接続手段の接続状
態が外れるような不具合は発生しないし、作動油フィル
タ室及び作動油フィルタが一つで済むため、機器構成の
複雑化や、メンテナンス性の悪化を招くことはない。ま
た、比較的容積の大きい作動油フィルタ室に脈動を伴う
脈動型油圧アクチュエータからの戻り油が直接流入する
ため、戻り油の脈動は減衰沈静化し静圧型油圧アクチュ
エータの作動へ悪影響を及ぼすことはない。しかも、前
記脈動型油圧アクチュエータからの戻り油流入口に対面
しない位置に前記作動油フィルタを配置しているため、
脈動型油圧アクチュエータからの戻り油の脈動圧が作動
油フィルタに直接的に作用することによる作動油フィル
タの破損や変形を防止することができる。 Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil passage structure of a construction machine such as a hydraulic shovel provided with a hydraulic tank and a hydraulic oil filter. 2. Description of the Related Art FIG. 7 is a diagram showing a configuration of a main oil passage of a return oil circuit according to an embodiment of the prior art provided in a hydraulic shovel. For example, a hydraulic excavator provided with a hydraulic actuator that easily generates pulsation of a hitting device or the like (including a hydraulic crusher called a so-called hydraulic breaker) employs an oil path configuration as shown in FIG. That is, for example, a return oil passage 40 from a static pressure type hydraulic actuator (static pressure type hydraulic actuator is not shown) in which return oil such as a boom cylinder, an arm cylinder, a traveling motor, a swing motor and the like is relatively unlikely to generate pulsation. a ,..., 40 n and a return oil passage 41 from a pulsating hydraulic actuator (pulsating hydraulic actuator not shown) that is likely to cause pulsation such as a striking device. Return oil passages 40 a , ---, 40 from the static pressure type hydraulic actuator
and n are joined on the upstream side of the pipe connection means for oil path connection. In addition, the return oil pipe may be long due to the arrangement of the hydraulic device, and therefore an error is likely to occur in the mounting position of the hydraulic oil filter to the return oil inlet 43, and connection is made while absorbing this error. For this purpose, a plug-in type coupling 44 usually called a coupling is used as a pipe connection means. Reference numeral 1 denotes a hydraulic oil tank. FIG. 8 is a diagram showing a configuration of a main portion of a return oil circuit in another embodiment of the prior art, but an oil channel configuration as shown in FIG. 8 may be employed in some cases. That is, for example, a return oil path 40 ′ from a static pressure type hydraulic actuator, such as a boom cylinder, an arm cylinder, a traveling motor, and a turning motor, which does not easily generate pulsation in return oil, and a hydraulic oil filter chamber 42 connected thereto. And a return oil passage 41 'from a pulsating hydraulic actuator, such as a percussion device, which tends to cause pulsation, and a hydraulic oil filter chamber 45 connected thereto. Is made to flow. In the prior art shown in FIG. 7, return oil from a pulsating hydraulic actuator with pulsation is supplied from a hydrostatic hydraulic actuator without pulsation upstream of piping connection means. Therefore, there is a possibility that the connection state of the pipe connection means (joint 44) may be disconnected due to hydraulic pulsation. Further, there is a possibility that the hydraulic pulsation propagates to the static pressure type hydraulic actuator and causes an operation failure. FIG. 8 shows that the return oil from the pulsating hydraulic actuator is provided separately from the hydraulic oil filter chamber 42 'into which the return oil from the hydrostatic hydraulic actuator flows in order to solve the problem shown in FIG. Things. According to the configuration of FIG. 8, although the inconvenience shown in FIG. 7 does not occur, it is necessary to separately provide a dedicated hydraulic oil filter chamber 45 and a hydraulic oil filter (not shown). The production cost becomes expensive, and maintenance work is required for the two hydraulic oil filters, thereby deteriorating the maintainability. According to the present invention, there is provided a hydraulic pump, a hydrostatic actuator which is driven by a discharge oil from the hydraulic pump and does not cause pulsation in return oil, and a discharge from the hydraulic pump. A pulsating hydraulic actuator driven by oil and accompanied by pulsation of return oil, a hydraulic oil filter chamber into which return oil from the static pressure hydraulic actuator and the pulsating hydraulic actuator flows, and an operation disposed in the hydraulic oil filter chamber An oil filter, and a hydraulic oil tank into which return oil that has passed through the hydraulic oil filter chamber flows.The hydraulic oil filter chamber has a return oil inlet from the static pressure type hydraulic actuator and the pulsating hydraulic actuator. The return oil inlet and the pulsation
Do not face the return hydraulic inlet from the hydraulic actuator
The hydraulic oil filter was placed at a position where the hydraulic oil filter did not work. According to this configuration, since the return oil from the static pressure type hydraulic actuator and the return oil from the pulsation type hydraulic actuator flow directly into one hydraulic oil filter chamber, the return oil inlet of the static pressure type hydraulic actuator and the hydraulic oil filter chamber The hydraulic pulsation of the return oil from the pulsating hydraulic actuator does not act on the pipe connection means that connects with the pipe connection means, so that there is no problem that the connection state of the pipe connection means is disconnected, and the hydraulic oil filter chamber and the hydraulic oil filter Since only one device is required, the device configuration is not complicated and the maintenance performance is not deteriorated. Further, since return oil from the pulsating hydraulic actuator accompanied by pulsation flows directly into the hydraulic oil filter chamber having a relatively large volume, the return oil pulsation is attenuated and calmed, and does not adversely affect the operation of the hydrostatic hydraulic actuator. . [0007] Moreover, since the arranging the hydraulic fluid filter in a position which does not face the return oil inlet from the pulsating hydraulic actuators, pressure pulsation of the oil returning from the pulsating hydraulic actuator directly to the hydraulic fluid filter This also prevents the hydraulic oil filter from being damaged or deformed by acting on the hydraulic oil filter. An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an oil passage structure 7 according to one embodiment of the present invention. In the drawing, reference numeral 8 denotes a hydraulic oil tank mounted on a hydraulic shovel (not shown), and 9 denotes a hydraulic oil tank provided inside the hydraulic oil tank 8 for removing fouling substances mixed into return oil circulating from a hydraulic circuit. A hydraulic oil filter chamber into which return oil flows (usually called a return filter), 10 is an upper cover of the hydraulic oil filter chamber 9, 11 is a case, and 12 is a filter member disposed in the hydraulic oil filter chamber 9. A hydraulic oil filter (generally called a filter element), and a tank 13 for connecting a return oil passage (described later) from a hydrostatic actuator (not shown) in which return oil does not involve pulsation. An oil pipe for connecting the tank-side connection part 13 with the return oil inflow chamber 16 inside the case 11;
Reference numeral 7 denotes a return oil inlet where the oil pipe 14 is open in the case 11, and reference numeral 18 denotes a tank side for connecting a return oil passage (described later) from a pulsating hydraulic actuator (described later) with return oil pulsation. A connecting portion, 19 is an oil pipe for connecting the tank-side connecting portion 18 to the return oil inflow chamber 16 inside the case 11, 20 is a return oil inlet, in which the oil tube 19 is open in the case 11, and 21 is a hydraulic pump ( On the other hand, a suction filter for filtering the working oil in the working oil tank 8 when the working oil is sucked in the working oil tank 8, and an upper cover 22 of the suction filter 21. FIG. 2 is a vertical cross-sectional view of a main part viewed from AA in FIG. In the figure, reference numeral 23 denotes a spring for applying a biasing force for fixing the hydraulic oil filter 12 below the inside of the case 11. FIG. 3 is a side view of a main part viewed from B in FIG. FIG. 4 is a main part hydraulic circuit diagram of a hydraulic shovel (not shown) having an oil passage structure 7 according to one embodiment of the present invention. In the figure, reference numeral 24 denotes a hydraulic actuator in which return oil is accompanied by pulsation, for example, a hydraulic crusher (usually called a hydraulic breaker) of a striking device or the like;
25 is a hydraulic switching valve for the hydraulic crusher 24, 26 is a hydraulic remote control valve for operating the hydraulic crusher 24, and 27 and 28 are a plurality of hydraulic actuators mounted on a hydraulic shovel and having no return oil pulsation (shown in the figure). Directional control valves (only two directional control valves 27 and 28 are described as representative examples), 29 is a hydraulic pump that discharges main pressure oil, and 30 is a pilot pump that is a pilot hydraulic power source , 31 are cut valves, and 32, 33 are return oil pipelines, respectively. Next, the structure of the oil passage structure 7 according to one embodiment of the present invention will be described with reference to FIGS. In the oil passage structure 7 of the present embodiment, a hydraulic pump 29 and a static pressure type hydraulic actuator driven by a discharge oil from the hydraulic pump 29 and not causing pulsation in the return oil (for example, a boom cylinder, an arm (not shown)) A hydraulic actuator such as a cylinder, a traveling motor, a swing motor, etc.) and the hydraulic pump 2
A pulsating hydraulic actuator (for example, a striking device such as a hydraulic crusher 24 shown in FIG. 4) driven by the discharge oil from the pump 9 and pulsating the return oil, and the static pressure hydraulic actuator and the pulsating hydraulic actuator The hydraulic oil filter chamber 9 into which the return oil flows from, the hydraulic oil filter 12 arranged in the hydraulic oil filter chamber 9, and the hydraulic oil tank 8 into which the return oil that has passed through the hydraulic oil filter chamber 9 flows. In the hydraulic oil filter chamber 9, a return oil inlet 17 from the static pressure type hydraulic actuator and a return oil inlet 20 from the pulsation type hydraulic actuator were formed. Next, the operation of the oil passage structure 7 according to one embodiment of the present invention will be described. According to the configuration of the oil passage structure 7 of the present embodiment, the return oil from the static pressure type hydraulic actuator and the return oil from the pulsation type hydraulic actuator flow directly into one hydraulic oil filter chamber 9. Pipe connection means for connecting the return oil inlet 17 of the hydraulic oil filter chamber 9 (pipe connection means connected to the tank-side connection part 13 shown in FIG. 4 but not shown)
In this case, the hydraulic pulsation of the return oil from the pulsating hydraulic actuator does not act, so that there is no problem that the connection state of the pipe connection means is disconnected, and only one hydraulic oil filter chamber 9 and one hydraulic oil filter 12 are required. In addition, the configuration of the device is not complicated and the maintenance is not deteriorated. Further, since return oil from the pulsating hydraulic actuator accompanied by pulsation directly flows into the hydraulic oil filter chamber 9 having a relatively large volume, the return oil pulsation is attenuated and calmed down, which adversely affects the operation of the hydrostatic hydraulic actuator. Absent. Further, the hydraulic oil filter 1 is located at a lower position shown in FIG. 2 so as not to face the return oil inlet 20 from the pulsating hydraulic actuator.
The arrangement of 2 prevents the hydraulic oil filter 12 from being damaged or deformed by the pulsating pressure of the return oil from the pulsating hydraulic actuator acting directly on the hydraulic oil filter 12. FIG. 5 is a perspective view showing a main part of an oil passage structure 34 according to another embodiment of the present invention. In the figure, 35 is a hydraulic oil tank, 37 is a hydraulic oil filter chamber, 38 is a head cover which is a pipe connection means connected to the upper part of the hydraulic oil filter chamber 37, and 39 is a hydraulic oil filter chamber 37 for a vehicle body (not shown). , A return oil pipe in which return oil with pulsation recirculates, a return pipe 33 'in which return oil without pulsation recirculates,
0 is a return oil pipe for returning oil filtered in the hydraulic oil filter chamber 37 into the hydraulic oil tank 35;
51, 52 and 53 are the return oil pipes 32 'and 3 respectively.
Reference numerals 3 ′ and 50 denote head cover-side fittings, and reference numeral 54 denotes a tank-side fitting of the return oil pipe 50. FIG.
It is a hydraulic circuit diagram of a main part of a hydraulic shovel (not shown) provided with an oil passage structure 34 according to another embodiment of the present invention. In the figure, components using the same components as those of the oil passage structure 7 of the embodiment shown in FIG. 4 are denoted by the same reference numerals. In an oil passage structure 34 of another embodiment shown in FIGS. 5 and 6, a hydrostatic pump (not shown) driven by a hydraulic pump 29 and a discharge oil from the hydraulic pump 29 and having no return oil pulsation. For example, a hydraulic actuator such as a boom cylinder, an arm cylinder, a traveling motor, a swing motor, etc.) and a pulsating hydraulic actuator driven by oil discharged from the hydraulic pump 29 and pulsating with return oil (see FIG. A hydraulic device such as a hydraulic crusher 24), a return oil pipe 33 'from the static pressure type hydraulic actuator, a return oil pipe 32' from the pulsation type hydraulic actuator, A hydraulic oil filter chamber 37 into which return oil from the actuator and the pulsating hydraulic actuator flows, and disposed in the hydraulic oil filter chamber 37 A hydraulic oil filter (not shown), a pipe connection means (referred to as a head cover 38) for connecting an oil path between the return oil pipe 33 'from the static pressure type hydraulic actuator and the hydraulic oil filter, and A hydraulic oil tank 35 into which return oil that has passed through the oil filter chamber 37 flows; return oil from the static pressure type hydraulic actuator and return oil from the pulsation type hydraulic actuator are connected to the pipe connection means (head cover 38); It merges with the hydraulic oil filter chamber 37. According to the structure of the oil passage structure 34 of the other embodiment, the joining means (head cover 38) can be provided at the return oil inlet or the return oil flow can be provided without changing the conventional hydraulic oil filter chamber. T between the inlet and the pipe connection means
By attaching a converging means such as a U-shaped connector (not shown), it is possible to prevent problems such as disconnection of the pipe connection means with a simpler configuration, complication of equipment configuration, and deterioration of maintainability. it can. These operations themselves form a return oil inlet from the hydrostatic actuator and a return oil inlet from the pulsating hydraulic actuator in the above-mentioned hydraulic oil filter chamber (referred to as the hydraulic oil filter chamber 9 shown in FIG. 1). However, according to this configuration, it is possible to reduce costs and minimize the need to make changes to peripheral devices, and to retrofit existing products. Can be applied. According to the oil passage structure of the construction machine of the present invention,
For the hydraulic oil filter chamber provided in the hydraulic oil tank,
A return oil inlet from the static hydraulic actuator and a return oil inlet from the pulsating hydraulic actuator are formed , and the return oil from the static hydraulic actuator and the return oil from the pulsating hydraulic actuator are formed in one hydraulic oil filter chamber. Return oil is directly introduced and the pulsating hydraulic actuator is
Actuates at a position not facing the return oil inlet from the eta
Since the oil filter is provided, the hydraulic pulsation of the return oil from the pulsating hydraulic actuator does not act on the pipe connecting means for connecting the static pressure type hydraulic actuator and the return oil inlet of the working oil filter chamber, and the pipe connection is performed. There is no problem such that the connection state of the means is disconnected, and only one hydraulic oil filter chamber and one hydraulic oil filter are required. Further, since return oil from the pulsating hydraulic actuator accompanied by pulsation flows directly into the hydraulic oil filter chamber having a relatively large volume, the return oil pulsation is attenuated and calmed, and does not adversely affect the operation of the hydrostatic hydraulic actuator. . Moreover, since the hydraulic oil filter is arranged at a position not facing the return oil inlet from the pulsating hydraulic actuator ,
It is possible to prevent the hydraulic oil filter from being damaged or deformed due to the pulsating pressure of the return oil from the pulsating hydraulic actuator directly acting on the hydraulic oil filter .
【図面の簡単な説明】
【図１】本発明の一実施形態の油路構造を示す平面図で
ある。
【図２】図１のＡ−Ａより見た要部たて断面図である。
【図３】図２のＢより見た要部側面図である。
【図４】本発明の一実施形態の油路構造をそなえた油圧
ショベルの要部油圧回路図である。
【図５】本発明の他実施形態の油路構造を示す要部斜視
図である。
【図６】本発明の他実施形態の油路構造をそなえた油圧
ショベルの要部油圧回路図である。
【図７】油圧ショベルに装備されている従来技術の一実
施例戻り油回路の要部油路構成を示す図である。
【図８】従来技術の他実施例戻り油回路の要部油路構成
を示す図である。
【符号の説明】
１，１’，８，３５ 作動油タンク
７，３４ 油路構造
９，３７，４２，４２’，４５ 作動油フィルタ室
１１ ケース
１２ 作動油フィルタ
１６ 戻り油流入室
１７，２０，４３ 戻り油流入口
２４ 油圧破砕機
２９ 油圧ポンプ
３２’，３３’，５０ 戻り油用配管
３８ ヘッドカバー
４０a ，−−，４０n ，４１ 戻り油油路BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an oil passage structure according to an embodiment of the present invention. FIG. 2 is a vertical sectional view taken along line AA of FIG. FIG. 3 is a side view of a main part as viewed from B in FIG. 2; FIG. 4 is a main part hydraulic circuit diagram of the hydraulic shovel having the oil passage structure according to the embodiment of the present invention. FIG. 5 is a perspective view of an essential part showing an oil passage structure according to another embodiment of the present invention. FIG. 6 is a main part hydraulic circuit diagram of a hydraulic shovel having an oil passage structure according to another embodiment of the present invention. FIG. 7 is a diagram showing a configuration of a main oil passage of a return oil circuit mounted on a hydraulic excavator according to one embodiment of the prior art. FIG. 8 is a diagram illustrating a configuration of a main part oil passage of a return oil circuit according to another embodiment of the related art. [Description of Signs] 1, 1 ', 8, 35 Hydraulic oil tank 7, 34 Oil passage structure 9, 37, 42, 42', 45 Hydraulic oil filter chamber 11 Case 12 Hydraulic oil filter 16 Return oil inflow chamber 17, 20 , 43 return oil inlet 24 hydraulic crusher 29 hydraulic pump 32 ', 33', 50 return oil pipe 38 head cover 40 a, -, 40 n, 41 return oil hydraulic passage
───────────────────────────────────────────────────── フロントページの続き (72)発明者 築穴 隆司 広島県広島市西区庚午中４丁目21−26− 507 (72)発明者 山口 和芳 広島県広島市安佐南区祇園６丁目12−19 (72)発明者 岩満 裕明 広島県広島市安佐南区沼田町大塚7024番 地 (56)参考文献 特開 平８−189336（ＪＰ，Ａ) 特開 昭60−44604（ＪＰ，Ａ) 特開 昭62−196409（ＪＰ，Ａ) 特開 平９−108900（ＪＰ，Ａ) 実開 昭60−190840（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F15B 11/00 - 11/22 E02F 9/00 E02F 9/20 - 9/22 B01D 27/08 B01D 35/02 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Chikuana 4-21-26-507, Kogonaka, Nishi-ku, Hiroshima-shi, Hiroshima 507 (72) Inventor Kazuyoshi Yamaguchi 6-12-19, Gion, Asaminami-ku, Hiroshima-shi, Hiroshima (72) Inventor Hiroaki Iwamitsu 7024 Otsuka, Numata-cho, Asaminami-ku, Hiroshima City, Hiroshima Prefecture (56) References JP-A-8-189336 (JP, A) JP-A-60-44604 (JP, A) JP 62-196409 (JP, A) JP-A-9-108900 (JP, A) Japanese Utility Model Application Showa 60-190840 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F15B 11/00 -11/22 E02F 9/00 E02F 9/20-9/22 B01D 27/08 B01D 35/02
Claims (1)
出油により駆動され、戻り油に脈動を伴わない静圧型油
圧アクチュエータと、前記油圧ポンプからの吐出油によ
り駆動され、戻り油に脈動を伴う脈動型油圧アクチュエ
ータと、前記静圧型油圧アクチュエータ及び脈動型油圧
アクチュエータからの戻り油が流入する作動油フィルタ
室と、前記作動油フィルタ室内に配置された作動油フィ
ルタと、前記作動油フィルタ室を通過した戻り油が流入
する作動油タンクとを有し、 前記作動油フィルタ室は前記静圧型油圧アクチュエータ
からの戻り油流入口と前記脈動型油圧アクチュエータか
らの戻り油流入口とを有し、かつ前記脈動型油圧アクチ
ュエータからの戻り油圧流入口に対面しない位置に前記
作動油フィルタを配置してなることを特徴とする建設機
械の油路構造。(57) [Claim 1] A hydraulic pump, a static pressure type hydraulic actuator driven by discharge oil from the hydraulic pump and having no pulsation in return oil, and a discharge oil from the hydraulic pump A pulsating hydraulic actuator that is driven and causes pulsation of return oil, a hydraulic oil filter chamber into which return oil from the static pressure hydraulic actuator and the pulsating hydraulic actuator flows, and a hydraulic oil filter disposed in the hydraulic oil filter chamber And a hydraulic oil tank into which return oil that has passed through the hydraulic oil filter chamber flows. The hydraulic oil filter chamber includes a return oil inlet from the static pressure type hydraulic actuator and return oil from the pulsating type hydraulic actuator. An inlet , and the pulsating hydraulic actuator
At a position not facing the return hydraulic inlet from the
An oil passage structure for a construction machine, comprising a hydraulic oil filter .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24937297A JP3437067B2 (en) | 1997-08-28 | 1997-08-28 | Oil passage structure of construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24937297A JP3437067B2 (en) | 1997-08-28 | 1997-08-28 | Oil passage structure of construction machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1162905A JPH1162905A (en) | 1999-03-05 |
| JP3437067B2 true JP3437067B2 (en) | 2003-08-18 |
Family
ID=17192051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24937297A Expired - Lifetime JP3437067B2 (en) | 1997-08-28 | 1997-08-28 | Oil passage structure of construction machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3437067B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4535447B2 (en) * | 2005-11-18 | 2010-09-01 | キャタピラージャパン株式会社 | Filter misassembly prevention structure |
-
1997
- 1997-08-28 JP JP24937297A patent/JP3437067B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1162905A (en) | 1999-03-05 |
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