JPS60123629A - Hydraulic circuit for hydraulic shovel - Google Patents

Hydraulic circuit for hydraulic shovel

Info

Publication number
JPS60123629A
JPS60123629A JP58229955A JP22995583A JPS60123629A JP S60123629 A JPS60123629 A JP S60123629A JP 58229955 A JP58229955 A JP 58229955A JP 22995583 A JP22995583 A JP 22995583A JP S60123629 A JPS60123629 A JP S60123629A
Authority
JP
Japan
Prior art keywords
valve
switching valve
switching
running
parallel
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
Application number
JP58229955A
Other languages
Japanese (ja)
Inventor
Yukitaka Mimura
三村　幸敬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP58229955A priority Critical patent/JPS60123629A/en
Publication of JPS60123629A publication Critical patent/JPS60123629A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • 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
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To enable other working machine to be operated in priority in a condition to hold running straightness, by a method werein, when other working machine is actuated during straight running, the feed and discharge pipes for running motors on both sides are interconnected through a switching valve, and a throttle valve is located on the upperstream side from each running control valve. CONSTITUTION:In a 2-pump system, a slewing control valve 5, a boom control valve 6 and an arm control valve 7 are connected in parallel to a first hydraulic pump 1, and a left running control valve 8 is connected in parallel thereto through a throttle valve 12. Meanwhile, a boom control valve 9 and a bucket control valve 10 are connected in parallel to a second hydraulic pump 2, and a right running control valve 11 is connected in parallel thereto through a throttle valve 13. Further, feed and discharge lines 16, 17, 18 and 19 for right and left running motors are interconnected through a switching valve 24. The throttle valve 12 is switched during control of the slewing and arm control valves and the throttle valve 13 is switched during control of the bucket and boom control valves. This enables other controls to be performed in a condition that running straightness is held.

Description

【発明の詳細な説明】 本発明は、油圧ショベルの走行操作と、各種アクチュエ
ータの操作との同時操作性を改良した油圧ショベルの油
圧回路に関するものであり、その［’ｌとするところは
、２ポンプ２コントロ一ルバルブ方式による油圧回路を
備えた油圧ショベルにおいて直進走行中に走行モータ以
外の各アクチュエータ、例えば旋回モータ、アームシリ
ンダ或はアームシリンダ等を作動させても、油圧ショベ
ルの左、右の走行モータが走行力の均等性を失うこ殊 となく常に走行の直進性を４ｉ（Ａ　ｍすることができ
る油圧回路を提供することにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic circuit for a hydraulic excavator that improves the simultaneous operability of the traveling operation of the hydraulic excavator and the operation of various actuators. In a hydraulic excavator equipped with a hydraulic circuit based on the pump 2 control valve system, even if actuators other than the travel motor, such as the swing motor, arm cylinder, or arm cylinder, are operated while the excavator is traveling straight, the left and right side of the excavator It is an object of the present invention to provide a hydraulic circuit that can always maintain the straightness of running at 4i (Am) without causing a running motor to lose uniformity of running force.

従来の油圧ショベルの回路は例えば第２図に示スヨウに
、第１のポンプ（１）に対しては旋回、フー（７）　、
　（８）が、また第２のポンプに対してはブーム、パケ
ット、右走行のための各切換弁（９）　、　（１１、α
ηがそれぞれ並列に接続されており、両ポンプ回路は合
流することがなくそれぞれ独立回路を形成している。　
このような流体回路では直進走行中に他のアクチュエー
タを操作した場合、そのアクチュエータが走行モータよ
り負荷の軽い時は、操作した側の走行モータへの圧油の
流入計が減少して蛇行をひき起し、逆にそのアクチュエ
ータが走ｆ：Ｊ’モータより負荷の大きい時は、操作し
た側の圧油は優先的に走行モータに供給され、他のアク
チュエータを適ｉＥに駆動できない欠点があった。For example, the circuit of a conventional hydraulic excavator is shown in FIG.
(8), and for the second pump there are switching valves (9), (11, α
η are connected in parallel, and the two pump circuits do not merge and form independent circuits.
In such a fluid circuit, if another actuator is operated while traveling straight, and the load on that actuator is lighter than that of the traveling motor, the inflow meter of pressure oil to the operated traveling motor decreases and the meandering is prevented. Conversely, when the load on that actuator is greater than that on the travel f:J' motor, the pressure oil on the operated side is preferentially supplied to the travel motor, which has the disadvantage that other actuators cannot be driven to the appropriate iE. .

本発明は、従来の油圧回路における前記の如き欠点を解
消したものである。The present invention eliminates the above-mentioned drawbacks of conventional hydraulic circuits.

以下、本発明の一実施例を第１図を参照しつつ説明する
。An embodiment of the present invention will be described below with reference to FIG.

２基の油圧ポンプ（１）　、　（２）と２基の多連コン
トロールバルブ（３）　、　Ｃ４）を備えた油圧ショベ
ルの油圧回路において、一方のコントロールバルブ（３
）の切換アーム用切換弁（７）をポンプ（］）にそれぞ
れ並列流路（ハ）を介し互に並列接続し、その下流に左
走行用切換弁（８）を同じく並列流路（イ）を介して並
列接続し、更に他方の切換弁群（４）はブーム用切換弁
（９）、パケット用切換弁α１をポンプ２にそれぞれ並
列流路（ハ）を介して並列接続し、その下流に右走行用
切換弁αυを同しく並列流路（ハ）を介して並列接続し
ている。In the hydraulic circuit of a hydraulic excavator equipped with two hydraulic pumps (1), (2) and two multiple control valves (3), C4), one control valve (3)
) are connected in parallel to the pump (]) through the parallel flow paths (c), and downstream of the switching valves (8) for left travel are connected in parallel to the pump (]), respectively, through the parallel flow paths (a). Further, the other switching valve group (4) connects the boom switching valve (9) and the packet switching valve α1 to the pump 2 in parallel via parallel flow paths (c), and the downstream The right travel switching valve αυ is also connected in parallel via the parallel flow path (c).

０■、α→は走行用切換弁（８）、αυ上流の並列流路
（ハ）。0■, α→ is the travel switching valve (8), and the parallel flow path (c) upstream of αυ.

（ハ）に設けた絞り弁で常時は開位置（１２ａ）。The throttle valve installed in (c) is normally in the open position (12a).

（］３ａ）に保持され、一方の絞り弁αつは旋回用切換
弁（５）またはアーム用切換弁（７）が、絞り弁（１彰
ま遼 ブーム１旭用切換弁（９）またはバケツ］・用切換弁０
０の少くとも一方が切換位置になったときこれに連動し
て絞り位置（］、２ｂ）、（１３ｂ）に切換わるように
構成されている。　０時、α乃は、ポンプ（１）からの
圧油を左走行用切換弁（８）を介して左走行モータα→
に導く管路、α→、（］ツはポンプ（２）からの圧油を
右走行用切換弁（１１）を介して右走行モータＯＱに導
く管路である。　左、右の走行モータα→、θツの前進
側給油管路聾１０→は分岐管路（ホ）、（イ）により、
また後進側給油管路０η、α引は分岐管路Ｑ→、（ハ）
により、それぞれ常時は閉位置に保持され、パイロット
圧が作用した場合開位置にｚｂ）に切換わる切換弁（ハ
）を介して接続されている。(] 3a), and one throttle valve α is the swing switching valve (5) or the arm switching valve (7), and the throttle valve (1. ]・Switching valve 0
When at least one of the positions 0 and 0 reaches the switching position, the aperture positions are switched to the aperture positions (], 2b), and (13b) in conjunction with this. At 0:00, αno transfers pressure oil from the pump (1) to the left travel motor α→ through the left travel switching valve (8).
The pipe leading to α→, (] is the pipe leading the pressure oil from the pump (2) to the right travel motor OQ via the right travel switching valve (11).Left and right travel motors α →, θ forward side oil supply pipe deaf 10 → is by branch pipe (E) and (A),
Also, the reverse side oil supply pipe 0η, α is the branch pipe Q→, (c)
are connected via switching valves (c) which are normally held in the closed position and switched to the open position (zb) when pilot pressure is applied.

前記、左走行用切換弁（８）および右走行用切換弁αυ
にはそれぞれ該切換弁（８）、αυに連動して切換えら
れる用切換弁に）、（ハ）を連設するとともに、該副切
換弁匈、（ハ）の一方には前記絞り弁θつ、α［有］上
流の並列流路２７より分岐したパイロット管路（ハ）、
（ト）を介して導いた圧油をシャトル弁０◇により高圧
選択し、更にパイロット管路０壜こより前記一方の用切
換弁（ハ）の人口ボート０引こ接続する。　芹、右の用
切換弁に）、（ハ）はパイロット管路（ロ）、（（Ｉで
接続し、該用切換弁（ハ）、（ハ）は左、右の走行用切
換弁（８）、◇◇が両者共前進側または後進側に切換え
られた場合にのみ、すなわち直進走行時のみ前記選択さ
れた圧油を他方の用切換弁（ハ）の出口ボート（ト）に
導く。The left running switching valve (8) and the right running switching valve αυ
The switching valves (8) and (C) are connected to the switching valves (8) and (C) which are switched in conjunction with αυ, and one of the sub switching valves (C) is equipped with the throttle valve θ. , α [with] a pilot pipe branched from the upstream parallel flow path 27 (c),
The pressure oil led through (g) is selected at a high pressure by shuttle valve 0◇, and the artificial boat 0 of said one of the switching valves (c) is connected through pilot pipe 0 bottle. Seri, to the right switching valve), (c) is connected to the pilot pipe (b), ), ◇◇ are both switched to the forward or reverse side, that is, only when traveling straight ahead, the selected pressure oil is guided to the outlet boat (g) of the other switching valve (c).

この他方の用切換弁（ハ）の出口ボート（ハ）に導かれ
た圧油はパイロット管路０かこ設けた常時は閉位置（３
８ａ　）にあるが、前記他の切換弁、即ぢ旋回用切換弁
（５）、アーム用切換弁（７）、ブーム１速用切換弁（
９）またはパケット用切換弁α０）の少なくとも１つが
切換位置にある時、開位置（３ｓｂ）に切換わるパイロ
ット管路開閉弁３８を介して前記切換弁（ハ）のパイロ
ットボートに導かれている。The pressure oil led to the outlet boat (c) of this other switching valve (c) is normally in the closed position (3
8a), the other switching valves mentioned above, the switching valve for instant swing (5), the switching valve for arm (7), and the switching valve for boom 1st speed (
9) Or, when at least one of the packet switching valves α0) is in the switching position, it is guided to the pilot boat of the switching valve (c) via the pilot conduit opening/closing valve 38 which switches to the open position (3sb). .

前述の絞り弁０のを作動させる信号■、■および絞り弁
（１３を作動させる信号■、■と、パイロット管路開閉
弁（ハ）を作動させる信号の、■、■、■はそれぞれ同
一符号を付した各切換弁からの信号に応答することを示
す。　なお、Ｏｎ　、　ＩＩは回路の安全弁、θ］）〜
０→はロードチェック弁である。The signals ■, ■, which actuate the throttle valve 0 mentioned above, the signals ■, ■, which actuate the throttle valve (13), and the signals ■, ■, and ■, which actuate the pilot pipe opening/closing valve (c), have the same symbols, respectively. Indicates that it responds to the signal from each switching valve marked with .In addition, On and II are the safety valves of the circuit, θ]) ~
0→ is a load check valve.

次に本発明による油圧ショベルのｎｌ＋ｌ回圧を走行操
作と他のアクチーエータとの同時操作を行った場合につ
いて説明する。Next, a case will be described in which the nl+l rotation pressure of the hydraulic excavator according to the present invention is performed simultaneously with the traveling operation and with another actuator.

（１）走行のみを操作した場合 左走行用切換弁（８）を切換操作して左走行のみ、或は
右走行用切換弁α℃を切換え操作して右走行のみ、また
は左、右の走行用切換弁（８）　、　（＋１）を切換え
て左、右の走行を同時に操作しても、旋回、アーム、バ
ケント等の切換弁は操作されていないので、並列回路（
イ）、（ハ）に設けた絞り弁ａφ、◇埠は働らかないと
共に、パイロット管路０乃に設けた開閉弁０杼は閉位置
（３８ａ）に保持される。(1) When only running is operated: Switch the left running switching valve (8) to run only on the left, or switch the right running switching valve α℃ to run only on the right, or drive on the left or right. Even if you switch the switching valves (8) and (+1) for left and right travel at the same time, the switching valves for swing, arm, backent, etc. are not operated, so the parallel circuit (
The throttle valves aφ and ◇bar provided in a) and (c) do not work, and the on-off valve 0 shuttle provided in the pilot pipe line 0 is held at the closed position (38a).

従って、切換弁（ハ）にはパイロット圧は作用せず閉位
置（２４ａ）に保持されたままであるため左、右の走行
は完全に独立している。　この場合は第２図に示す従来
回路と異なるところはない。Therefore, no pilot pressure acts on the switching valve (c) and it remains held at the closed position (24a), so left and right travel are completely independent. In this case, there is no difference from the conventional circuit shown in FIG.

（２）直進走行と旋回またはアームを同時操作した場合 〃、右の走行用切換弁を前進側或は後進側に切換えると
共に旋回用切換弁（５）を切換操作して旋回操作した場
合、旋回用切換弁（５）と左走行用切換弁（８）とは並
列に接続されているため、ポンプ（１）からの圧油は双
方に供給されるが、旋回用切換弁（５）の操作に連動し
て絞り弁（６）が絞り位置（１２ｂ）に切換わるので、
圧油は絞り弁（ロ）の絞り量に応じて旋回モータに優先
的に供給されるため所望の旋回動作が可能であるが、左
走行用切換弁（８）に供給される圧油はそ−の分だけ減
少する。(2) When traveling straight and turning or operating the arm at the same time, if the right traveling switching valve is switched to the forward or reverse side and the turning switching valve (5) is also switched and the turning operation is performed, the turning Since the switching valve for turning (5) and the switching valve for left travel (8) are connected in parallel, pressure oil from the pump (1) is supplied to both, but the operation of the switching valve for turning (5) The throttle valve (6) switches to the throttle position (12b) in conjunction with the
Pressure oil is preferentially supplied to the swing motor according to the throttle amount of the throttle valve (B), so the desired swing operation is possible, but the pressure oil supplied to the left travel switching valve (8) is It decreases by -.

一方、絞り弁αネ上流の並列流路に）から分岐されたパ
イロット管路−には絞り弁αつによりパイロット圧が作
用すると共に、走行用切換弁（８）　、　（１４）がと
もに前進側または後進側に切換えられているので、シャ
トル弁０◇を介して副切換弁（ハ）の入口ボー）０１に
供給されたパイロット圧油はパイロット管路（ロ）又は
（至）を介して他方の副切換弁（ハ）の出口ボート（ト
）に導ひかれパイロット管路０乃を介してパイロット管
路開閉弁（至）の入口ボートに供給される。　この時開
閉弁（至）は旋回動作と駆動した信号■により開位置に
切換えられているのでパイロット圧は切換弁（ハ）のパ
イロットボートに作用し、該切換弁（ハ）を開位置（２
４ｂ）に切換える。　従って、左、右走行モータα→、
０→の給排管路αりとα力及びα力とα傷とは切換弁（
ハ）を介して互に連通されるので、左、右の走行モータ
Ｑ→、αりに供給される圧油の油量及び油圧に差があっ
てもこれが等しくなるように分流するのでポンプ（１）
から走行モータと旋回モータへ圧油を供給し、ポンプ（
２）は走行モータのみに圧油を供給しているにかかわら
ず左、右の走行モータに供給される油圧は平衡し、直進
走行が可能となる。On the other hand, pilot pressure is applied by the throttle valve α to the pilot pipe branched from the parallel flow path upstream of the throttle valve α, and both the traveling switching valves (8) and (14) are on the forward side. Or, since it is switched to the reverse side, the pilot pressure oil supplied to the inlet bow) 01 of the auxiliary switching valve (c) via the shuttle valve 0◇ is transferred to the other side via the pilot pipe (b) or (to). It is led to the outlet boat (g) of the sub-switching valve (c) and is supplied to the inlet boat of the pilot pipe opening/closing valve (to) via the pilot pipe line 0 to. At this time, the on-off valve (to) has been switched to the open position by the turning action and the driven signal (2), so the pilot pressure acts on the pilot boat of the switching valve (c), moving the switching valve (c) to the open position (2).
4b). Therefore, left and right traveling motors α→,
0 → supply/discharge pipe α ri and α force, α force and α damage are the changeover valve (
Since they are communicated with each other via the pump (c), even if there is a difference in the amount and oil pressure of the pressure oil supplied to the left and right travel motors Q→ and α, the flow is divided so that the oil pressure is equal. 1)
The pump (
In 2), even though pressure oil is supplied only to the travel motor, the oil pressure supplied to the left and right travel motors is balanced, and straight forward travel is possible.

同様に、直進走行中にアームを操作した場合も鍔需鉋ポ
ンプ（１）からの圧油は優先してアームシリンダに供給
されるが、左、右走行モータはポンプ（１）　、　（２
）の一方或は双方から等量ずつ分流された圧油により駆
動され、走行の直進性を保つことができる。Similarly, when the arm is operated while traveling straight, pressure oil from the tsuba demand plane pump (1) is preferentially supplied to the arm cylinder, but the left and right travel motors are supplied to the arm cylinder with priority.
) is driven by an equal amount of pressure oil diverted from one or both of them, making it possible to maintain straight running.

（３）直進走行とブームまたはパケットを同時操作した
場合 左、右の走行用切換弁を前進側或は後進側に切換えると
共に、ブーム用切換弁（９）を操作し、ブームを操作し
た場合、ブーム１速用切換弁（９）と右走行用切換弁α
すとは並列に接続されているため、ポンプ（２）からの
圧油は双方に供給されるが、ブーム１速用切換弁（９）
の操作に連動して絞り弁（至）が絞り位置に切換わるの
で、圧油は絞りカぐ゛ ことができ、所望のブームの動作智可能であるが、右走
行用切換弁ｃＩηに供給される圧油はその分だけ減少す
る。　一方副切換弁（ハ）１（ハ）及びブーム用切換弁
（９）の作動により前述同様に切換弁（ハ）にパイロッ
ト圧が供給され、該弁（ハ）は開位置（２４ｂ）に切換
わり、ポンプ（１）　、　（２）の一方或は双方から圧
油が左、右走行モータに均等に供給されるため走行の直
進性を保つことができる。(3) When traveling straight ahead and operating the boom or packet at the same time When operating the boom by switching the left and right travel switching valves to the forward or reverse side, and operating the boom switching valve (9), Boom 1st speed switching valve (9) and right travel switching valve α
Since the two are connected in parallel, pressure oil from the pump (2) is supplied to both, but the boom 1st speed switching valve (9)
Since the throttle valve (to) switches to the throttle position in conjunction with the operation of The amount of pressure oil used will decrease accordingly. On the other hand, pilot pressure is supplied to the switching valve (C) as described above by the operation of the auxiliary switching valve (C) 1 (C) and the boom switching valve (9), and the valve (C) is switched to the open position (24b). On the other hand, since pressure oil is evenly supplied to the left and right travel motors from one or both of the pumps (1) and (2), it is possible to maintain the straightness of travel.

走行とパケットの同時操作時も同様である。　〜上記の
ように本油圧回路では直進走行中に他のアクチュエータ
を操作した場合、〃、右の走行モータの給排管路を互に
切換弁（ハ）を介して接続するため左、右の走行モータ
ーの圧油の供給量は等しくなり走行の直進性が保たれる
とともに走行モータ用切換弁の上流側並列管路中に設け
た絞り弁（ロ）、（１１により他のアクチュエータにこ
とができ、更に走行単独操作時には絞り弁及び切換弁は
作用せず、従来同様左、右走行の独立性は保持される。The same applies when running and packet are operated simultaneously. ~ As mentioned above, in this hydraulic circuit, when operating other actuators while traveling straight, the left and right drive motor's supply and discharge pipes are connected to each other via the switching valve (c). The amount of pressurized oil supplied to the travel motor is equalized, the straightness of travel is maintained, and the throttle valve (b) (11) installed in the parallel pipe on the upstream side of the travel motor switching valve prevents other actuators from being connected. Furthermore, the throttle valve and switching valve do not operate during single travel operation, and the independence of left and right travel is maintained as in the past.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明を実施する油圧ショベルの油圧回路図、
第２図は従来のものの油圧回路図である。 （５）・・・旋回用切換弁、（６）・・・ブーム２速用
切換弁。 （７）・・アーム用切換弁、（８）・・・左走行用切換
弁１（９）・・ブーム１速用切換弁、α１・・・パケッ
ト用切換弁αυ・・・右走行用切換弁、θシ、０・・・
絞り弁。 ＞ａ・・・切換弁、に）、（ハ）・・・開切換弁。 （ト）・・・パイロット管路開閉弁FIG. 1 is a hydraulic circuit diagram of a hydraulic excavator implementing the present invention;
FIG. 2 is a conventional hydraulic circuit diagram. (5)...Swing switching valve, (6)...Boom 2nd speed switching valve. (7)...Switching valve for arm, (8)...Switching valve for left running 1 (9)...Switching valve for boom 1st speed, α1...Switching valve for packet αυ...Switching for right running Valve, θshi, 0...
Throttle valve. >a...Switching valve, (c)...Open switching valve. (g)...Pilot pipe opening/closing valve

Claims (1)

【特許請求の範囲】 二基の油圧ポンプと、すれぞれが互に並列接続された走
行用切換弁と少くとも１個の他の切換弁を有する二基の
多連コントロールバルブを備えた油圧ショベルの油圧回
路において、走行用切換弁の操作に連動して切換られる
割切換弁を有する走行用切換弁を各多連コントロールバ
ルブの切換弁群中最下流に配置すると共に、該走行用切
換弁の上流側並列管路に各多連コントロールバルブの切
換弁群中の他の切換弁の操作に連動して作用する絞り弁
を配置し、かつ、左、右の走行モータの前進側管路同志
および後進側管路同志をそれぞれ連通或は遮断する切換
弁を介して接続し、該切換弁のパイロットポートに前記
絞り弁の上流からそれぞれ分岐し、シャトル弁で高圧選
択され、更に左。 右の走行用切換弁に連動し、直進走行時のみ、該パイロ
ット管路を連通ずる割切換弁およびノクイロット圧が作
用した時にのみ前進側管路同志および後進側管路同志を
それぞれ連通させるようにした、ことを特徴とする油圧
ンヨベルの油圧回路。[Claims] A hydraulic system comprising two hydraulic pumps and two multiple control valves each having a traveling switching valve and at least one other switching valve connected in parallel to each other. In the hydraulic circuit of the excavator, a traveling switching valve having a split switching valve that is switched in conjunction with the operation of the traveling switching valve is arranged at the most downstream of the switching valve group of each multiple control valve, and the traveling switching valve A throttle valve that operates in conjunction with the operation of the other switching valves in the switching valve group of each multiple control valve is arranged in the upstream parallel pipes of the left and right travel motors. and the reverse side conduits are connected through switching valves that communicate or cut off each other, branched to the pilot ports of the switching valves from upstream of the throttle valve, selected by a shuttle valve at high pressure, and further left. It is linked to the right travel switching valve and connects the pilot pipes only when traveling straight, and connects the forward side pipes and the reverse side pipes only when the noquilot pressure is applied. A hydraulic circuit for a hydraulic yawbel.
JP58229955A 1983-12-07 1983-12-07 Hydraulic circuit for hydraulic shovel Pending JPS60123629A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58229955A JPS60123629A (en) 1983-12-07 1983-12-07 Hydraulic circuit for hydraulic shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58229955A JPS60123629A (en) 1983-12-07 1983-12-07 Hydraulic circuit for hydraulic shovel

Publications (1)

Publication Number Publication Date
JPS60123629A true JPS60123629A (en) 1985-07-02

Family

ID=16900323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58229955A Pending JPS60123629A (en) 1983-12-07 1983-12-07 Hydraulic circuit for hydraulic shovel

Country Status (1)

Country Link
JP (1) JPS60123629A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715029A1 (en) * 1994-06-28 1996-06-05 Hitachi Construction Machinery Co., Ltd. Hydraulic circuit apparatus for hydraulic excavators
JPH09324444A (en) * 1997-02-10 1997-12-16 Komatsu Ltd Control device for construction machine
EP0719948A3 (en) * 1994-12-28 1998-08-05 Samsung Heavy Industries Co., Ltd Straight travelling apparatus for heavy construction equipment
KR100518748B1 (en) * 1998-10-02 2005-11-25 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Driving straight hydraulic circuit of heavy equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715029A1 (en) * 1994-06-28 1996-06-05 Hitachi Construction Machinery Co., Ltd. Hydraulic circuit apparatus for hydraulic excavators
EP0715029A4 (en) * 1994-06-28 1997-12-17 Hitachi Construction Machinery Hydraulic circuit apparatus for hydraulic excavators
EP0719948A3 (en) * 1994-12-28 1998-08-05 Samsung Heavy Industries Co., Ltd Straight travelling apparatus for heavy construction equipment
JPH09324444A (en) * 1997-02-10 1997-12-16 Komatsu Ltd Control device for construction machine
KR100518748B1 (en) * 1998-10-02 2005-11-25 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Driving straight hydraulic circuit of heavy equipment

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