JPS59106705A - Hydraulic circuit for hydraulic shovel and the like - Google Patents
Hydraulic circuit for hydraulic shovel and the likeInfo
- Publication number
- JPS59106705A JPS59106705A JP57216934A JP21693482A JPS59106705A JP S59106705 A JPS59106705 A JP S59106705A JP 57216934 A JP57216934 A JP 57216934A JP 21693482 A JP21693482 A JP 21693482A JP S59106705 A JPS59106705 A JP S59106705A
- Authority
- JP
- Japan
- Prior art keywords
- flow path
- switching valve
- valve
- flow passage
- neutral
- 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.)
- Pending
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は油圧ショベルの旋回操作とアーム操作の如く
、作動圧の異なる複数のアクチュータの同時操作性を向
上させるための油圧回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic circuit for improving simultaneous operability of a plurality of actuators having different operating pressures, such as swing operation and arm operation of a hydraulic excavator.
従来この種の複数のアクチュエータを駆動する油圧回路
としては例えば第１図に示す如く中立流路と並列高圧流
路とにより連結された多連切換弁により行なうものが知
られているが、この従来の油圧回路では作動圧の異なる
アーム操作と旋回操作とを同時に行なった場合、作動油
は作動圧の低いアームのアクチュエータに多く供給され
、作動圧の高い旋回のアクチュエータへの圧油の供給が
少くなり十分な旋回力が得られない。Conventionally, as a hydraulic circuit for driving a plurality of actuators of this kind, there has been known a hydraulic circuit using multiple switching valves connected by a neutral flow path and a parallel high-pressure flow path as shown in FIG. In a hydraulic circuit, when arm operation and swing operation with different working pressures are performed at the same time, more hydraulic oil is supplied to the actuator of the arm with lower working pressure, and less pressure oil is supplied to the actuator of the swinging arm with higher working pressure. Therefore, sufficient turning force cannot be obtained.
このため例えば、旋回操作とアーム操作とを同時に行な
い穴を掘削する場合、旋回にょる押付力が不足しアーム
（バクット）が旋回方向に逃るため、掘削穴の端面を直
線的に仕上げることができない不具合を免れなかった。For this reason, for example, when drilling a hole by performing a swing operation and an arm operation at the same time, the pressing force due to the swing is insufficient and the arm (bakut) escapes in the direction of the swing, making it impossible to finish the end face of the drilled hole in a straight line. I couldn't avoid some problems.
この発明は上記に鑑みなされたものであって、多連切換
弁を介して複数のアクチュエータを駆動する主ポンプと
該ポンプの外に少くとも１個の補助ポンプを設け、作動
圧の異なる複数のアクチュエータを同時に操作する場合
、一方のアクチュエータに補助切換弁を介して補助ポン
プからの圧油を供給することにより、複数のアクチュエ
ータの同時操作性の向上を計ったものである。This invention was made in view of the above, and includes a main pump that drives a plurality of actuators via a multiple switching valve, and at least one auxiliary pump outside the pump, and a plurality of actuators with different operating pressures. When operating the actuators simultaneously, pressure oil is supplied from the auxiliary pump to one of the actuators via the auxiliary switching valve, thereby improving the simultaneous operation of multiple actuators.
以下、図面に示した実施例に沿い説明する。The following will explain the embodiments shown in the drawings.
第２図の実施例において、１，２は図示しない原動機に
よって駆動される主ポンプ、３はｌ主ポンプ１，２と同
じ原動機によって駆動される補助ホ”ンプである。In the embodiment shown in FIG. 2, 1 and 2 are main pumps driven by a prime mover (not shown), and 3 is an auxiliary pump driven by the same prime mover as the main pumps 1 and 2.
４は前記主ポンプ１からの圧油の供給を受け、図示しな
いアクチュエータの動作を制御する多連切換弁で、走行
用切換弁５．ブーム用切換弁６．旋回用切換弁７．及び
アーム用切換弁８により構成されており、これらの切換
弁は、中立流路９及び該中立流路９と並列に設けられた
並列高圧流路ｉ。Reference numeral 4 designates a multiple switching valve that receives pressure oil from the main pump 1 and controls the operation of an actuator (not shown), including a travel switching valve 5. Boom switching valve6. Swing switching valve7. and an arm switching valve 8, these switching valves include a neutral flow path 9 and a parallel high pressure flow path i provided in parallel with the neutral flow path 9.
により互に接続されている。are connected to each other by
１１は前記主ポンプ２からの圧油の供給を受け、図示し
ないアクチュエータの動作を制御する多連切換弁で走行
用切換弁１２．パケット用切換弁１３及びブーム用切換
弁１４により構成されており、これらの切換弁は、前記
多連切換弁４と同様中立流路１５及び該中立流路１５と
並列に設けられた並列高圧流路１６により互に接続され
ている。Numeral 11 is a multiple switching valve that receives pressure oil from the main pump 2 and controls the operation of an actuator (not shown), and is a traveling switching valve 12. It is composed of a packet switching valve 13 and a boom switching valve 14, and these switching valves, like the multiple switching valve 4, have a neutral flow path 15 and a parallel high pressure flow provided in parallel with the neutral flow path 15. They are interconnected by lines 16.
１７は補助切換弁で前記多連切換弁４の旋回用切換弁７
と連動して切換えられると共に、該弁１７の切換によっ
て補助ポンプ３の吐出流路１８をタンク１９と逆止弁２
０を介して前記旋回用切換弁７上流側め中立流路９に切
換接続する。Reference numeral 17 denotes an auxiliary switching valve, which is the swing switching valve 7 of the multiple switching valve 4.
By switching the valve 17, the discharge passage 18 of the auxiliary pump 3 is connected to the tank 19 and the check valve 2.
The upstream side of the swirl switching valve 7 is connected to the neutral flow path 9 via the swivel switching valve 7.
２１は逆止弁で前記吐出流路１８と中立流路９との接続
点より上流の中立流路９に上流側（ブーム用切換弁６側
）への逆流を防止するように設けられている。Reference numeral 21 denotes a check valve, which is provided in the neutral flow path 9 upstream of the connection point between the discharge flow path 18 and the neutral flow path 9 to prevent backflow toward the upstream side (toward the boom switching valve 6 side). .
２４は前記旋回用切換弁７の圧油供給流路で、該流路２
４は前記中立流路９と前記逆止弁２１の後段で中立流路
９側への逆流を防止する逆止弁２２を介して接続される
と共に、前記並列高圧流路１０と並列高圧流路側への逆
流を防止する逆止弁２３を介してそれぞれ接続されてい
る。Reference numeral 24 denotes a pressure oil supply flow path for the swing switching valve 7, and the flow path 2
4 is connected to the neutral flow path 9 and the check valve 21 via a check valve 22 that prevents backflow to the neutral flow path 9 side, and is connected to the parallel high pressure flow path 10 and the parallel high pressure flow path side. are connected to each other via check valves 23 that prevent backflow.
２５は各並列高圧流路と前記旋回用切換弁７以外の各切
換弁の並列高圧ボートＥ間に設けたロードチェック弁で
必要数設置している。Reference numeral 25 denotes a load check valve provided between each parallel high-pressure flow path and the parallel high-pressure boat E of each switching valve other than the swirl switching valve 7, and a required number of them are installed.
２６は多連切換弁４及び１１に設けたＩＪ ＩＪ−フ弁
２７は補助ポンプ３用のリリーフ弁である。Reference numeral 26 indicates an IJ valve provided in the multiple switching valves 4 and 11. An IJ-F valve 27 is a relief valve for the auxiliary pump 3.
なお、前記旋回用切換弁７は本実施例にこだわることな
く、走行切換弁５の下流であればどの位置に置き換えて
も良い。Note that the turning switching valve 7 is not limited to this embodiment, and may be replaced at any position downstream of the travel switching valve 5.
また、本実施例では、補助切換弁１７は多連切換弁４と
別体にしたものについて例示しているが、両者を一体構
造とすること、或は第３図の郷にパイロット切換弁にす
ること。 更には第４図の様にアンロード回路に置換す
ること等の変更が可能なことは言うまでもない。Further, in this embodiment, the auxiliary switching valve 17 is shown as being separate from the multiple switching valve 4, but it is possible to make both of them into an integrated structure, or to use the pilot switching valve as shown in FIG. to do. Furthermore, it goes without saying that changes such as replacing it with an unload circuit as shown in FIG. 4 are possible.
以上の通り、本発明によれば、多連切換弁４の走行用切
換弁５、ブーム用切換弁６及びアーム用切換弁８の操作
は従来装置と全く同様であるが、旋回用アクチュエータ
を操作するために旋回用切換弁７を中立位置から左・右
いずれかに切換えると、この切換に連動して補助切換弁
１７が切換わり、該弁１７を介して、補助ポンプ３の吐
出油が旋回用切換弁７の上流側中立流路９に合流する。As described above, according to the present invention, the operation of the traveling switching valve 5, the boom switching valve 6, and the arm switching valve 8 of the multiple switching valve 4 is completely the same as in the conventional device, but the swing actuator is operated. When the swing switching valve 7 is switched from the neutral position to either the left or the right in order to It joins the neutral flow path 9 on the upstream side of the switching valve 7.
このため、旋回用切換弁７とアーム用切換弁８とを同時
に操作した場合、一般的には両者の作動圧が異なる（ア
ームの方が小さい）ので、従来の如く並列高圧流路１０
からのみ両者に同時に（並列に）圧油を供給した場合作
動圧の低い方（アーム）に主として供給され、作動圧の
高い方（旋回）への圧油の供給が十分なされない不具合
を免れないが、本発明によれば旋回用切換弁７の操作に
連動して、補助ポンプ３の吐出圧油が旋回用切換弁７の
上流側中立流路９に供給されるから、旋回用切換弁７を
操作した場合、旋回用アクチュエータには、該切換弁７
を介し従来の並列高圧流路１０からの圧油の供給と同時
に、中立流路９に合流した補助ポンプ３からの圧油が旋
回用アクチュエータのみに供給されるので、アームと旋
回とを同時に操作する場合にも旋回操作に必要な作動圧
油が得られる。Therefore, when the swing switching valve 7 and the arm switching valve 8 are operated at the same time, the operating pressures of the two are generally different (lower for the arm), so the parallel high-pressure flow path 10 is
If pressure oil is supplied to both at the same time (in parallel), it will be mainly supplied to the side with lower operating pressure (arm), and there will be a problem that insufficient pressure oil will be supplied to the side with higher operating pressure (swivel). However, according to the present invention, the pressure oil discharged from the auxiliary pump 3 is supplied to the neutral flow path 9 on the upstream side of the swing switching valve 7 in conjunction with the operation of the swing switching valve 7. When operating the switching actuator, the switching valve 7
Simultaneously with the supply of pressure oil from the conventional parallel high-pressure flow path 10 through the neutral flow path 9, pressure oil from the auxiliary pump 3 that merges into the neutral flow path 9 is supplied only to the swing actuator, so the arm and swing can be operated at the same time. The hydraulic oil required for turning operations can also be obtained.
以上の通りこの発明によれば、多連切換弁により作動圧
の異なる例えば旋回とアームの同時操作を行なう場合、
旋回用のアクチュエータ用切換弁の切換に連動して補助
切換弁を切換え、該補助切換弁を介して補助ポンプの吐
出圧油を旋回用のアクチュエータ用切換弁の上流側中立
流路に供給するから作動圧の高いアクチュエータにも十
分な作動圧油の供給が可能である。As described above, according to the present invention, when simultaneous operation of a swing and an arm using different operating pressures is performed using a multiple switching valve,
The auxiliary switching valve is switched in conjunction with the switching of the swinging actuator switching valve, and the pressure oil discharged from the auxiliary pump is supplied to the upstream neutral flow path of the swinging actuator switching valve through the auxiliary switching valve. Sufficient working pressure oil can be supplied even to actuators with high working pressure.
従って、この発明を油圧ショベルに応用し旋回操作によ
りパケット（アーム）を壁面に押（ｑけながらアームを
操作して壁面掘削を行なう場合にも十分な旋回押付力が
得られる。Therefore, even when the present invention is applied to a hydraulic excavator and the packet (arm) is pushed (q) against a wall surface by the swing operation and the arm is operated to excavate the wall surface, a sufficient swing pressing force can be obtained.
また、補助ポンプ３の吐出圧油は旋回用アクチュエータ
のみに供給されるので旋回押付力は補助ポンプ３のリリ
ーフ弁２７により設定された力となり、アームの作動圧
の影響を受けないと共に、補助ポンプ３の吐出流量を適
切に選択することによって、旋回押付時のリリーフ損失
を小さくでき、かつ、旋回は主ポンプからの圧油の供給
により旋回速度を速くでき、作業能率の向上並びに適切
な油温管理等も可能になる等の効果を有する。In addition, since the discharge pressure oil of the auxiliary pump 3 is supplied only to the swing actuator, the swing pressing force is the force set by the relief valve 27 of the auxiliary pump 3, and is not affected by the operating pressure of the arm, and the auxiliary pump By appropriately selecting the discharge flow rate in step 3, the relief loss during swing pressing can be reduced, and the swing speed can be increased by supplying pressure oil from the main pump, improving work efficiency and ensuring an appropriate oil temperature. This has the effect of making management, etc. possible.
実施例を示す図である。
ｌ ： 主ポンプ ３ ： 補助ポンプ４ ： 多
連切換弁 ５〜８：切換弁９ ： 中立流路
ｌｏ：並例高圧流路１７：補助切換弁 ２２．２３
．２５ ：逆止弁２６、２７ ： リリーフ弁
２８： アンロード弁
２９： シャトル弁
１
図It is a figure showing an example. l: Main pump 3: Auxiliary pump 4: Multiple switching valve 5-8: Switching valve 9: Neutral flow path
lo: Normal high pressure flow path 17: Auxiliary switching valve 22.23
．． 25: Check valve 26, 27: Relief valve 28: Unload valve 29: Shuttle valve 1 Figure
Claims (1)
ポンプと該ポンプの外に少くとも１個の補助ポンプを設
け、かつ、該補助ポンプの吐出流路を多連切換弁中０１
個の切換弁と連動して切換られる補助切換弁を介してそ
の多連切換弁のすぐに流側中立流路に接続すると共に、
その接続点より上流の中立流路に上流への逆流を防止す
る逆止弁を設け、更に該逆上弁後段の中立流路及び並列
高圧流路からそれぞれ分岐し勺前記１個の多連切換弁の
圧油供給流路に、それぞれ、圧油供給流路側から中立流
路側及び並列高圧流路側への逆流を防止する逆止弁を設
けたことを特徴とする油圧ショベル等の油圧回路。At least one auxiliary pump is provided outside of a main pump that drives a plurality of actuator units via a multiple switching valve, and the discharge flow path of the auxiliary pump is connected to a main pump that drives a plurality of actuator units via a multiple switching valve.
via an auxiliary switching valve that is switched in conjunction with the multiple switching valves, and connected to the neutral flow path immediately on the downstream side of the multiple switching valve;
A check valve is provided in the neutral flow path upstream from the connection point to prevent backflow to the upstream side, and the neutral flow path and parallel high pressure flow path after the reverse upper valve are branched from each other. A hydraulic circuit for a hydraulic excavator or the like, characterized in that each pressure oil supply flow path of a valve is provided with a check valve that prevents backflow from the pressure oil supply flow path side to a neutral flow path side and a parallel high pressure flow path side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57216934A JPS59106705A (en) | 1982-12-13 | 1982-12-13 | Hydraulic circuit for hydraulic shovel and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57216934A JPS59106705A (en) | 1982-12-13 | 1982-12-13 | Hydraulic circuit for hydraulic shovel and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59106705A true JPS59106705A (en) | 1984-06-20 |
Family
ID=16696212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57216934A Pending JPS59106705A (en) | 1982-12-13 | 1982-12-13 | Hydraulic circuit for hydraulic shovel and the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59106705A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5148231A (en) * | 1974-09-09 | 1976-04-24 | Ibm | |
| JPS56142942A (en) * | 1980-04-09 | 1981-11-07 | Seirei Ind Co Ltd | Hydraulic circuit apparatus in excavator |
| JPS57184137A (en) * | 1981-05-06 | 1982-11-12 | Hitachi Constr Mach Co Ltd | Oil-pressure circuit for oil-pressure working machine |
-
1982
- 1982-12-13 JP JP57216934A patent/JPS59106705A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5148231A (en) * | 1974-09-09 | 1976-04-24 | Ibm | |
| JPS56142942A (en) * | 1980-04-09 | 1981-11-07 | Seirei Ind Co Ltd | Hydraulic circuit apparatus in excavator |
| JPS57184137A (en) * | 1981-05-06 | 1982-11-12 | Hitachi Constr Mach Co Ltd | Oil-pressure circuit for oil-pressure working machine |
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