JPH0755031A - Directional control valve for flow rate support - Google Patents
Directional control valve for flow rate supportInfo
- Publication number
- JPH0755031A JPH0755031A JP5200695A JP20069593A JPH0755031A JP H0755031 A JPH0755031 A JP H0755031A JP 5200695 A JP5200695 A JP 5200695A JP 20069593 A JP20069593 A JP 20069593A JP H0755031 A JPH0755031 A JP H0755031A
- Authority
- JP
- Japan
- Prior art keywords
- port
- spool
- actuator
- pressure oil
- directional control
- 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.)
- Granted
Links
Landscapes
- Operation Control Of Excavators (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
(57)【要約】
【目的】 ２つのアクチュエータに圧油を応援できる
し、コンパクトにでき、しかも１つのアクチュエータか
らの戻り油をタンクに流出できると共に、配管を容易に
できるようにする。
【構成】 弁ブロック２０のスプール孔２１に第１・第
２スプール２２，２３を嵌挿し、この第１スプール２２
を弁ブロック２０の左右一端部に設けた第１スプリング
３６で中立位置とし、その第１スプリング３６側に形成
した第１受圧室３７の圧油でアクチュエータに供給する
位置に移動するようにし、前記第２スプール２３を弁ブ
ロック２０の左右他端部に設けた第２・第３スプリング
４１，４２で中立位置とし、第１・第２スプリング４
１，４２側に形成した第２受圧室４７の圧油で戻り油を
タンクに流出する位置となり、かつ第３受圧室４８の圧
油で圧油をアクチュエータに供給する位置とする。
(57) [Summary] [Objective] To enable pressure oil to be supported by two actuators, to make it compact, and to allow return oil from one actuator to flow out to a tank and to facilitate piping. [Structure] The first and second spools 22 and 23 are fitted and inserted into a spool hole 21 of a valve block 20.
Is set to a neutral position by the first springs 36 provided on the left and right ends of the valve block 20, and is moved to a position where the pressure oil in the first pressure receiving chamber 37 formed on the first spring 36 side supplies the actuator to the actuator. The second spool 23 is set to the neutral position by the second and third springs 41 and 42 provided at the other left and right ends of the valve block 20, and the first and second springs 4 are
The return oil flows out to the tank by the pressure oil in the second pressure receiving chamber 47 formed on the side of the first and the second pressure chambers 42, and the pressure oil in the third pressure receiving chamber 48 supplies the pressure oil to the actuator.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、油圧ポンプの吐出圧油
を複数の方向制御弁により複数のアクチュエータに供給
する圧油供給装置に用いられて複数のアクチュエータに
油圧ポンプの吐出圧油を供給して高速作動する流量応援
用方向制御弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a pressure oil supply device for supplying the discharge pressure oil of a hydraulic pump to a plurality of actuators by a plurality of directional control valves and supplying the discharge pressure oil of the hydraulic pump to a plurality of actuators. The present invention relates to a flow control directional control valve that operates at high speed.
【０００２】[0002]
【従来の技術】油圧ポンプの吐出圧油を複数のアクチュ
エータに供給する圧油供給装置としては、油圧ポンプの
吐出路に複数の方向制御弁を設けて複数のアクチュエー
タにそれぞれ圧油を供給するもの、例えば油圧ポンプの
吐出路にブーム用方向制御弁、アーム用方向制御弁、バ
ケット用方向制御弁、旋回用方向制御弁、左右走行用方
向制御弁を設けてブームシリンダ、アームシリンダ、バ
ケットシリンダ、旋回モータ、左右走行モータに圧油を
供給するパワーショベルの油圧回路が知られている。2. Description of the Related Art As a pressure oil supply device for supplying pressure oil discharged from a hydraulic pump to a plurality of actuators, a plurality of directional control valves are provided in a discharge passage of the hydraulic pump to supply the pressure oil to a plurality of actuators. , For example, a boom directional control valve, an arm directional control valve, a bucket directional control valve, a swing directional control valve, a left and right traveling directional control valve are provided in the discharge path of the hydraulic pump, and a boom cylinder, an arm cylinder, a bucket cylinder, A hydraulic circuit of a power shovel that supplies pressure oil to the swing motor and the left and right traveling motors is known.
【０００３】このような油圧回路に用いられる各方向制
御弁は共通化を企てるために同一大きさとなり、各アク
チュエータに供給しうる最大流量は同一となって、各ア
クチュエータの最大作動速度は同一となるので、特定の
アクチュエータを高速作動する場合には流量応援用方向
制御弁を設けて特定のアクチュエータに大流量を供給で
きるようにしている。Each directional control valve used in such a hydraulic circuit has the same size in order to make it common, the maximum flow rate that can be supplied to each actuator is the same, and the maximum operating speed of each actuator is the same. Therefore, when a specific actuator is operated at high speed, a flow rate support directional control valve is provided so that a large flow rate can be supplied to the specific actuator.
【０００４】例えば、前述のパワーショベルの油圧回路
においてはブームシリンダ、アームシリンダを高速作動
する必要があるので、ブーム用方向制御弁、アーム用方
向制御弁と並列にブーム流量応援用方向制御弁とアーム
流量応援方向制御弁を設けてブームシリンダ、アームシ
リンダに大流量を供給できるようしている。For example, in the hydraulic circuit of the above-mentioned power shovel, since it is necessary to operate the boom cylinder and the arm cylinder at high speed, the boom directional control valve and the arm directional control valve are arranged in parallel with the boom flow rate support directional control valve. An arm flow rate direction control valve is provided to supply a large flow rate to the boom cylinder and arm cylinder.
【０００５】[0005]
【発明が解決しようとする課題】前述のようにして特定
のアクチュエータに大流量を供給しようとすると大流量
を供給する特定のアクチュエータの数だけ流量応援用方
向制御弁が必要となり、その流量応援用方向制御弁は弁
ブロックにスプールを嵌挿したものであるから、弁ブロ
ックの数が多くなって圧油供給装置が大型となり、設置
スペースが大きくなってしまう。When a large flow rate is to be supplied to a specific actuator as described above, directional control valves for supporting the flow rate are required as many as the specific actuators for supplying the large flow rate. Since the directional control valve has a spool fitted in the valve block, the number of valve blocks increases, the pressure oil supply device becomes large, and the installation space becomes large.
【０００６】なお、実開平４−１３４９６９号公報に示
すように１つの弁ブロックに２本のスプールを嵌挿し、
その２本のスプールを移動することで２つの回路を開閉
制御するようにした弁が知られているが、この弁は２本
のスプールをスプリングで一方向に付勢し、パイロット
圧でスプリングに抗して他方向に押す構造であるために
回路を開閉して圧油を流すか、圧油が流れないようにす
るかの機能を有するのみである。Incidentally, as shown in Japanese Utility Model Laid-Open No. 4-134969, two spools are fitted and inserted in one valve block,
A valve is known that controls the opening and closing of two circuits by moving the two spools. In this valve, the two spools are biased in one direction by springs and the pilot pressure is applied to the springs. Since it is a structure that pushes in the other direction against, it only has a function of opening and closing the circuit to allow the pressure oil to flow or to prevent the pressure oil from flowing.
【０００７】このために、前述の弁をブーム応援用方向
制御弁、アーム応援用方向制御弁として用いた場合には
ブームシリンダ、アームシリンダに圧油を供給したり、
その圧油の供給を停止するだけとなってブームシリン
ダ、アームシリンダからの戻り油の流れについては何ら
機能しない。For this reason, when the above-mentioned valve is used as a boom support directional control valve or an arm support directional control valve, pressure oil is supplied to the boom cylinder or arm cylinder,
Only the supply of the pressure oil is stopped, and the flow of the return oil from the boom cylinder and the arm cylinder does not function at all.
【０００８】しかしながら、アクチュエータからの戻り
油は方向制御弁のメータアウト開口を通ってタンクに流
出するために、アクチュエータの戻り油が多い場合には
流通抵抗大となって背圧大となるから、油圧馬力大、回
路ロス大となってしまう。例えば、アームシリンダの縮
み室に圧油を供給して縮み作動する場合に、その伸び室
からの戻り油が多いために背圧大となり、従って駆動圧
大となってしまう。However, since the return oil from the actuator flows out into the tank through the meter-out opening of the directional control valve, when the return oil of the actuator is large, the flow resistance becomes large and the back pressure becomes large. Large hydraulic horsepower and large circuit loss. For example, when pressure oil is supplied to the compression chamber of the arm cylinder to perform a compression operation, a large amount of oil is returned from the expansion chamber, resulting in a large back pressure and thus a large driving pressure.
【０００９】そこで、本発明は前述の課題を解決できる
ようにした流量応援用方向制御弁を提供することを目的
とする。Therefore, an object of the present invention is to provide a flow control directional control valve capable of solving the above-mentioned problems.
【００１０】[0010]
【課題を解決するための手段】弁ブロック２０のスプー
ル孔２１の左右に第１・第２スプール２２，２３を嵌挿
し、前記スプール孔２１に第１スプール２２で連通・遮
断される第１ポンプポート２７と第１アクチュエータポ
ート２９を形成し、そのスプール孔２１に第２スプール
２３で連通・遮断される第２ポンプポート２８と第２ア
クチュエータポート３０と第２タンクポート３２を形成
し、前記第１スプール２２を弁ブロック２０の左右一端
部に設けた第１スプリング３６で各ポートを遮断する中
立位置に保持し、この第１スプリング３６に形成した第
１受圧室３７に圧油で第１ポンプポート２７と第１アク
チュエータポート２９を連通する第１位置に移動するよ
うにし、前記第２スプール２３を弁ブロック２０の左右
他端部に設けたスプリングで各ポートを遮断する中立位
置に保持し、このスプリング側に形成した第２受圧室４
７の圧油で第２ポンプポート２８と第２アクチュエータ
ポート３０を連通し、かつ第２アクチュエータポート３
０と第２タンクポート３２を遮断する第１位置に移動
し、前記スプリング側に形成した第３受圧室４８の圧油
で第２アクチュエータポート３０を第２タンクポート３
２に連通し、かつ第２アクチュエータポート３０と第２
ポンプポート２８を遮断する第２位置に移動する構成と
した流量応援用方向制御弁。A first pump in which first and second spools 22 and 23 are fitted and inserted into the left and right of a spool hole 21 of a valve block 20 and which is communicated with and cut off from the spool hole 21 by the first spool 22. The second pump port 28, the second actuator port 30, and the second tank port 32, which form the port 27 and the first actuator port 29, and which are communicated with and blocked by the second spool 23, are formed in the spool hole 21 thereof. The first spool 22 is held in a neutral position where each port is blocked by first springs 36 provided at the left and right ends of the valve block 20, and a first pump is operated by pressure oil in a first pressure receiving chamber 37 formed in the first spring 36. The second spool 23 is moved to a first position where the port 27 and the first actuator port 29 communicate with each other, and the second spool 23 is provided at the other left and right ends of the valve block 20. Held in a neutral position to block the ports in the ring, the second pressure receiving chamber 4 formed in this spring-side
The second pump port 28 and the second actuator port 30 are communicated with each other by the pressure oil 7 and the second actuator port 3
0 and the second tank port 32 are blocked, and the second actuator port 30 is moved to the second tank port 3 by the pressure oil in the third pressure receiving chamber 48 formed on the spring side.
2 and communicates with the second actuator port 30 and the second actuator port 30.
A flow control directional control valve configured to move to a second position that shuts off the pump port 28.
【００１１】[0011]
【作 用】第１スプール２２を移動することで第１の
特定アクチュエータに圧油を供給できるし、第２スプー
ル２３を移動することで第２の特定アクチュエータに圧
油を供給でき、しかもその第１・第２スプール２２，２
３は１つの弁ブロック２０に設けてあるからコンパクト
にできる。また、第２スプール２３を第２位置に移動す
ることで第２の特定アクチュエータの戻り油をタンクに
流出でき、その第２の特定アクチュエータから大流量を
タンクに流出できて第２の特定アクチュエータをスムー
ズに作動できる。また、第１・第２スプール２２，２３
を移動する第１・第２・第３受圧室３７，４７，４８は
弁ブロック２０の左右端部に設けたスプリング側に形成
したので、第１・第２・第３受圧室３７，４７，４８に
圧油を供給する配管を弁ブロック２０の左右寄りに設け
れば良く、他の方向制御弁と連結した場合にその配管が
他の方向制御弁の配管と同様になって配管作業が容易と
なる。[Operation] By moving the first spool 22, pressure oil can be supplied to the first specific actuator, and by moving the second spool 23, pressure oil can be supplied to the second specific actuator. 1st and 2nd spool 22,2
Since 3 is provided in one valve block 20, it can be made compact. Further, by moving the second spool 23 to the second position, the return oil of the second specific actuator can be discharged to the tank, and a large flow rate can be discharged from the second specific actuator to the tank, so that the second specific actuator can be operated. It can operate smoothly. In addition, the first and second spools 22, 23
Since the first, second, and third pressure receiving chambers 37, 47, and 48 that move the are formed on the spring side provided at the left and right ends of the valve block 20, the first, second, and third pressure receiving chambers 37, 47, and A pipe for supplying pressure oil to 48 may be provided on the left and right sides of the valve block 20, and when connected to another directional control valve, the pipe becomes the same as the pipe of the other directional control valve, and the piping work is easy. Becomes
【００１２】[0012]
【実 施 例】図１に示すように、一対の油圧ポンプ１
の吐出路１ａは合流弁２を経てアーム用方向制御弁３、
左走行用方向制御弁４、旋回用方向制御弁５、ブーム用
方向制御弁６、右走行用方向制御弁７、バケット用方向
制御弁８、本発明に係る流量応援用方向制御弁９の入口
側に接続し、それぞれの方向制御弁によってアームシリ
ンダ１０、左走行モータ、旋回モータ、ブームシリンダ
１１、右走行モータ、バケットシリンダ圧油が供給され
る。前記流量応援用方向制御弁９はアーム用部９ａとブ
ーム用部９ｂを備え、そのアーム用部９ａはアーム応援
回路１２でアームシリンダ１０の伸び室１０ａに接続
し、ブーム用部９ｂはブーム応援回路１４でブームシリ
ンダ１１の伸び室１１ａに接続している。１５はロック
弁である。[Example] As shown in Fig. 1, a pair of hydraulic pumps 1
The discharge path 1a of the
Inlet of the left traveling directional control valve 4, the turning directional control valve 5, the boom directional control valve 6, the right traveling directional control valve 7, the bucket directional control valve 8, and the flow rate assisting directional control valve 9 according to the present invention. The arm cylinder 10, the left traveling motor, the swing motor, the boom cylinder 11, the right traveling motor, and the bucket cylinder pressure oil are supplied by the respective directional control valves. The flow control directional control valve 9 includes an arm portion 9a and a boom portion 9b. The arm portion 9a is connected to the extension chamber 10a of the arm cylinder 10 by an arm supporting circuit 12, and the boom portion 9b is a boom supporting portion. A circuit 14 connects to the extension chamber 11a of the boom cylinder 11. Reference numeral 15 is a lock valve.
【００１３】前記流量応援方向制御弁９の詳細を図２に
基づいて説明する。弁ブロック２０のスプール孔２１の
左右に第１スプール２２と第２スプール２３が摺動自在
に嵌挿され、そのスプール孔２１の左右中間部には中間
ポート２４が形成されていると共に、この中間ポート２
４を境として左右に第１・第２出口ポート２５，２６、
第１・第２ポンプポート２７，２８、第１・第２アクチ
ュエータポート２９，３０、第１・第２タンクポート３
１，３２がそれぞれ形成され、第１スプール２２には第
１出口ポート２５と第１ポンプポート２７を連通・遮断
する第１小径部３３と第１切欠３４が形成されていると
共に、その第１スプール２２は弁ブロック２０の左端面
２０ａに取付けたスプリング受け筒体３５内に設けた第
１スプリング３６で各ポートを遮断する中立位置に保持
され、スプリング受け筒体３５内に形成した第１受圧室
３７内の圧油で右方に押されて第１位置となる。前記第
２スプール２３は第２出口ポート２６と第２ポンプポー
ト２８を連通・遮断する第２小径部３８と第２切欠３９
及び第２アクチュエータポート３０と第２タンクポート
３２を連通・遮断する第３小径部４０と第３切欠４１が
形成されていると共に、第２、第３スプリング４２1 ，
４２3 で各ポートを遮断する中立位置に保持してある。Details of the flow rate support direction control valve 9 will be described with reference to FIG. A first spool 22 and a second spool 23 are slidably inserted into the left and right of a spool hole 21 of the valve block 20, and an intermediate port 24 is formed in the middle portion of the left and right of the spool hole 21. Port 2
The first and second outlet ports 25, 26 on the left and right of the border of 4,
First / second pump ports 27, 28, first / second actuator ports 29, 30, first / second tank port 3
1 and 32 are formed respectively, and the first spool 22 is formed with a first small diameter portion 33 and a first notch 34 for communicating and blocking the first outlet port 25 and the first pump port 27, and the first The spool 22 is held in a neutral position where each port is blocked by a first spring 36 provided in a spring receiving cylinder 35 attached to the left end surface 20a of the valve block 20, and the first pressure receiving pressure formed in the spring receiving cylinder 35 is maintained. The pressure oil in the chamber 37 pushes it to the right to the first position. The second spool 23 has a second small-diameter portion 38 and a second notch 39 for communicating and blocking the second outlet port 26 and the second pump port 28.
Also, a third small diameter portion 40 and a third notch 41 for communicating and blocking the second actuator port 30 and the second tank port 32 are formed, and the second and third springs 42 1 ,
Numeral 42 3 holds each port in a neutral position that shuts off each port.
【００１４】前記第１・第２スプール２２，２３の対向
端面２２ａ，２３ａは中間ポート２４に臨み、その中間
ポート２４はタンクに連通している。The facing end surfaces 22a and 23a of the first and second spools 22 and 23 face the intermediate port 24, and the intermediate port 24 communicates with the tank.
【００１５】前記弁ブロック２０の右端面２０ｂにはプ
レート４３を介してスプリング受け筒体４４が固着さ
れ、第２スプール２３の一端部にピストン４５がボルト
止めされ、そのピストン４５がプレート４３の孔４６に
嵌合して前記スプリング受け筒体４４内に第２圧力室４
７を構成し、その第１圧力室４７内の圧油で第２スプー
ル２３を左方に移動して第１位置とする。前記ピストン
４５の一端部とプレート４３の孔４６と弁ブロック２０
の右端面２０ｂとの間に第２受圧室４８を構成し、この
第２受圧室４８に供給される圧油でピストン４５を介し
て第２スプール２３を右方に移動して第２位置とする。A spring receiving cylinder 44 is fixed to the right end surface 20b of the valve block 20 via a plate 43, a piston 45 is bolted to one end of the second spool 23, and the piston 45 is a hole in the plate 43. The second pressure chamber 4 inside the spring receiving cylinder 44
7, the pressure oil in the first pressure chamber 47 moves the second spool 23 to the left to the first position. One end of the piston 45, the hole 46 of the plate 43, and the valve block 20.
A second pressure receiving chamber 48 is formed between the second pressure receiving chamber 48 and the right end face 20b of the second pressure receiving chamber 48, and the second spool 23 is moved to the right by the pressure oil supplied to the second pressure receiving chamber 48 via the piston 45. To do.
【００１６】前記スプリング受け筒体４４内に設けた杆
体４９が第２スプール２３に連結され、この杆体４９に
設けたスプリング受け５０とプレート４３間に第２スプ
リング４２1 が設けられ、そのスプリング受け５０とピ
ストン４５間に第３スプリング４２3 が設けられて第２
スプール２３を中立位置に保持してある。A rod 49 provided in the spring receiving cylinder 44 is connected to the second spool 23, and a second spring 42 1 is provided between the spring receiver 50 provided on the rod 49 and the plate 43. The third spring 42 3 is provided between the piston 50 and the piston 50,
The spool 23 is held in the neutral position.
【００１７】前記弁ブロック２０には左右の圧力補償弁
５３が設けられ、この圧力補償弁５３は弁本体５４にポ
ペット５５を設け、そのポペット５５をバネ５６で弁ブ
ロック２０の弁座５７に圧着して第１・第２出口ポート
２５，２６と第１・第２アクチュエータポート２９，３
０を遮断し、バネ室５６ａに供給される負荷圧とポペッ
ト５５に作用する入口側圧力で出口側圧力を設定する。The valve block 20 is provided with left and right pressure compensating valves 53. The pressure compensating valve 53 is provided with a poppet 55 on a valve body 54, and the poppet 55 is crimped to a valve seat 57 of the valve block 20 by a spring 56. Then, the first and second outlet ports 25 and 26 and the first and second actuator ports 29 and 3
0 is cut off, and the outlet side pressure is set by the load pressure supplied to the spring chamber 56a and the inlet side pressure acting on the poppet 55.
【００１８】前記圧力補償弁５３は負荷の異なるアクチ
ュエータに圧油を同時に供給する際にポンプ吐出圧と最
も高い負荷圧によりセットされて圧力補償し、これによ
り負荷の異なるアクチュエータに圧油を同時に供給でき
るようにするためのものであり、前記各方向制御弁にも
設けられている。The pressure compensating valve 53 is set by the pump discharge pressure and the highest load pressure when pressure oil is simultaneously supplied to the actuators having different loads, thereby compensating the pressure, thereby supplying pressure oil to the actuators having different loads at the same time. It is provided for each of the directional control valves.
【００１９】アームパイロット弁６０はパイロット油圧
ポンプ６１の吐出圧油を第１・第２パイロット回路６
２，６３に供給し、その第１・第２パイロット回路６
２，６３はアーム用方向制御弁３の第１・第２受圧部３
ａ，３ｂと前記第３・第２受圧室４８，４７にそれぞれ
接続している。The arm pilot valve 60 uses the pressure oil discharged from the pilot hydraulic pump 61 as the first and second pilot circuits 6
2, 63, and the first and second pilot circuits 6
2, 63 are the first and second pressure receiving portions 3 of the directional control valve 3 for arm.
a and 3b and the third and second pressure receiving chambers 48 and 47, respectively.
【００２０】ブームパイロット弁６４はパイロット油圧
ポンプ６１の吐出圧油を第１・第２パイロット回路６
５，６６に供給し、その第１・第２パイロット回路６
５，６６はブーム用方向制御弁６の第１・第２受圧部６
ａ，６ｂに接続し、第２パイロット回路６６が第１受圧
室３７に連通している。The boom pilot valve 64 uses the pressure oil discharged from the pilot hydraulic pump 61 for the first and second pilot circuits 6.
5, 66, and the first and second pilot circuits 6
Reference numerals 5 and 66 denote the first and second pressure receiving portions 6 of the boom directional control valve 6.
The second pilot circuit 66 communicates with the first pressure receiving chamber 37 by being connected to a and 6b.
【００２１】次に作動を説明する。ブームシリンダ１１
を伸ばしてブームを上昇する時。ブームパイロット弁６
４を操作して第２パイロット回路６６に圧油を出力す
る。これによりブーム用方向制御弁６が上げ位置ａとな
って油圧ポンプ１の吐出圧油がブームシリンダ１１の伸
び室１１ａに供給される。これと同時に流量応援用方向
制御弁９の第１受け圧室３７にパイロット圧油が供給さ
れて第１スプール２２が右に押されて第１位置となり、
第１ポンプポート２７と第１出口ポート２５が第１小径
部３３、第１切欠３４で連通し、第１アクチュエータポ
ート２９と第１タンクポート３１に遮断されたままとな
るので、油圧ポンプ１の吐出圧油が第１ポンプポート２
７、第１出口ポート２５、第１アクチュエータポート２
９よりブームシリンダ１１の伸び室１１ａに供給される
ので、ブームシリンダ１１の伸び室１１ａに大流量が供
給される。Next, the operation will be described. Boom cylinder 11
When extending and raising the boom. Boom pilot valve 6
4 is operated to output pressure oil to the second pilot circuit 66. As a result, the boom directional control valve 6 is set to the raised position a, and the discharge pressure oil of the hydraulic pump 1 is supplied to the extension chamber 11a of the boom cylinder 11. At the same time, pilot pressure oil is supplied to the first receiving pressure chamber 37 of the flow rate control directional control valve 9 to push the first spool 22 to the right to the first position,
The first pump port 27 and the first outlet port 25 communicate with each other through the first small diameter portion 33 and the first notch 34, and remain blocked from the first actuator port 29 and the first tank port 31. Discharge pressure oil is the first pump port 2
7, first outlet port 25, first actuator port 2
9 is supplied to the extension chamber 11a of the boom cylinder 11, so a large flow rate is supplied to the extension chamber 11a of the boom cylinder 11.
【００２２】アームシリンダ１０を伸ばしてアームを下
降して掘削する時。アームパイロット弁６０を操作して
第２パイロット回路６３にパイロット圧油を出力する。
これによりアーム用方向制御弁３が第１位置ｂとなって
油圧ポンプ１の吐出圧油がアームシリンダ１０の伸び室
１０ａに供給される。これと同時に流量応援用方向制御
弁９の第２受圧室４７にパイロット圧油が供給されて第
２スプール２３が左方に押されて第１位置となり、第２
ポンプポート２８と第２出口ポート２６が連通し、かつ
第２アクチュエータポート３０と第２タンクポート３２
は遮断されたままとなり、油圧ポンプ１の吐出圧油が第
２ポンプポート２８、第２出口ポート２６、第２アクチ
ュエータポート３０よりアームシリンダ１０の伸び室１
０ａに供給されるので、アームシリンダ１０の伸び室１
０ａに大流量が供給される。When the arm cylinder 10 is extended and the arm is lowered to excavate. The arm pilot valve 60 is operated to output pilot pressure oil to the second pilot circuit 63.
As a result, the arm directional control valve 3 is set to the first position b, and the discharge pressure oil of the hydraulic pump 1 is supplied to the extension chamber 10a of the arm cylinder 10. At the same time, the pilot pressure oil is supplied to the second pressure receiving chamber 47 of the flow rate support directional control valve 9 and the second spool 23 is pushed leftward to the first position, and the second position
The pump port 28 and the second outlet port 26 communicate with each other, and the second actuator port 30 and the second tank port 32
Is kept blocked, and the discharge pressure oil of the hydraulic pump 1 extends from the second pump port 28, the second outlet port 26, and the second actuator port 30 to the extension chamber 1 of the arm cylinder 10.
0a, the extension chamber 1 of the arm cylinder 10
A large flow rate is supplied to 0a.
【００２３】アームシリンダ１０を縮めてアームを上降
してダンプする時。アームパイロット弁６０を操作して
第１パイロット回路６２にパイロット圧油を出力する。
これによりアーム用方向制御弁３が第２位置ｃとなって
油圧ポンプ１の吐出圧油がアームシリンダ１０の縮み室
１０ｂに供給され、伸び室１０ａ内の圧油はタンクに流
出する。これと同時に流量応援用方向制御弁９の第１受
け圧室４８にパイロット圧油が供給されて第２スプール
２３が右方に押されて第２位置となり、第２ポンプポー
ト２８と第２出口ポート２６が遮断したままで第２アク
チュエータポート３０と第２タンクポート３２が第３小
径部４０と第３切欠４１で連通され、アームシリンダ１
０の伸び室１０ａ内の圧油が第２アクチュエータポート
３０、第２タンクポート３２よりタンクに流出し、アー
ムシリンダ１０の伸び室１０ａからタンクに大流量が流
出する。When the arm cylinder 10 is contracted and the arm is moved up and down to dump. The arm pilot valve 60 is operated to output pilot pressure oil to the first pilot circuit 62.
As a result, the arm directional control valve 3 is set to the second position c, the pressure oil discharged from the hydraulic pump 1 is supplied to the compression chamber 10b of the arm cylinder 10, and the pressure oil in the extension chamber 10a flows out to the tank. At the same time, pilot pressure oil is supplied to the first receiving pressure chamber 48 of the flow rate control directional control valve 9 to push the second spool 23 to the right to the second position, and the second pump port 28 and the second outlet are provided. The second actuator port 30 and the second tank port 32 are communicated with each other through the third small diameter portion 40 and the third notch 41 while the port 26 remains blocked.
The pressure oil in the extension chamber 10a of 0 flows out to the tank from the second actuator port 30 and the second tank port 32, and a large flow rate flows from the extension chamber 10a of the arm cylinder 10 to the tank.
【００２４】図３は第２実施例を示し、第１アクチュエ
ータポート２９と通路５８が遮断されており、さらにポ
ペット５５で第１アクチュエータポート２９より第１出
口ポート２５に圧油が流れないようにしてある。FIG. 3 shows a second embodiment in which the first actuator port 29 and the passage 58 are cut off, and the poppet 55 prevents pressure oil from flowing from the first actuator port 29 to the first outlet port 25. There is.
【００２５】このようにすれば、ブームシリンダ１１の
伸び室１１ａ内の圧油がスプール孔２１と第１スプール
２２との隙間よりタンクに流出しないので、ブームシリ
ンダ１１が外力によって縮み作動してブームが自然降下
することを最小限にできると共に、図２に示すロック弁
１５を省略できる。With this configuration, the pressure oil in the extension chamber 11a of the boom cylinder 11 does not flow out into the tank through the gap between the spool hole 21 and the first spool 22, so that the boom cylinder 11 is contracted by an external force to operate the boom cylinder. It is possible to minimize the natural fall of the valve, and the lock valve 15 shown in FIG. 2 can be omitted.
【００２６】[0026]
【発明の効果】第１スプール２２を移動することで第１
の特定アクチュエータに圧油を供給できるし、第２スプ
ール２３を移動することで第２の特定アクチュエータに
圧油を供給でき、しかもその第１・第２スプール２２，
２３は１つの弁ブロック２０に設けてあるからコンパク
トにできる。しかも、第２スプール２３を第２位置に移
動することで第２の特定アクチュエータの戻り油をタン
クに流出でき、その第２の特定アクチュエータから大流
量をタンクに流出できて第２の特定アクチュエータをス
ムーズに作動できる。また、第２スプールの切換装置を
第１スプール側にも設置することで第１、第２スプール
と共に、ポンプポートとアクチュエータポートに連通遮
断アクチュエータポートとタンクポート連通遮断を可能
にすることができる。また、第１・第２スプール２２，
２３を移動する第１・第２・第３受圧室３７，４７，４
８は弁ブロック２０の左右端部に設けたスプリング側に
形成したので、第１・第２・第３受け圧室３７，４７，
４８に圧油を供給する配管を弁ブロック２０の左右寄り
に設ければ良く、他の方向制御弁と連結した場合にその
配管が他の方向制御弁の配管と同様になって配管作業が
容易となる。By moving the first spool 22, the first spool 22
Pressure oil can be supplied to the specific actuator, and the pressure oil can be supplied to the second specific actuator by moving the second spool 23.
Since 23 is provided in one valve block 20, it can be made compact. Moreover, by moving the second spool 23 to the second position, the return oil of the second specific actuator can be discharged to the tank, and a large flow rate can be discharged from the second specific actuator to the tank, so that the second specific actuator can be operated. It can operate smoothly. Further, by installing the switching device for the second spool also on the first spool side, it is possible to disconnect the communication between the pump port and the actuator port as well as the communication between the actuator port and the tank port together with the first and second spools. Also, the first and second spools 22,
First, second and third pressure receiving chambers 37, 47, 4 moving 23
Since 8 is formed on the spring side provided at the left and right ends of the valve block 20, the first, second and third receiving pressure chambers 37, 47,
A pipe for supplying pressure oil to 48 may be provided on the left and right sides of the valve block 20, and when connected to another directional control valve, the pipe becomes the same as the pipe of the other directional control valve, and the piping work is easy. Becomes
【図１】本発明の実施例を示す圧油供給装置の全体説明
図である。FIG. 1 is an overall explanatory view of a pressure oil supply device showing an embodiment of the present invention.
【図２】本発明の流量応援用方向制御弁の第１実施例を
示す断面図である。FIG. 2 is a cross-sectional view showing a first embodiment of the flow control directional control valve of the present invention.
【図３】本発明の流量応援用方向制御弁の第２実施例を
示す断面図である。FIG. 3 is a sectional view showing a second embodiment of the flow control directional control valve of the present invention.
２０…弁ブロック、２１…スプール孔、２２…第１スプ
ール、２３…第２スプール、２５…中間ポート、２７…
第１ポンプポート、２８…第２ポンプポート、２９…第
１アクチュエータポート、３０…第２アクチュエータポ
ート、３２…第２タンクポート、３６…第１スプリン
グ、３７…第１受圧室、４７…第２受圧室、４８…第３
受圧室。20 ... Valve block, 21 ... Spool hole, 22 ... First spool, 23 ... Second spool, 25 ... Intermediate port, 27 ...
1st pump port, 28 ... 2nd pump port, 29 ... 1st actuator port, 30 ... 2nd actuator port, 32 ... 2nd tank port, 36 ... 1st spring, 37 ... 1st pressure receiving chamber, 47 ... 2nd Pressure receiving chamber, 48 ... Third
Pressure receiving chamber.
Claims (2)
に第１・第２スプール２２，２３を嵌挿し、前記スプー
ル孔２１に第１スプール２２で連通・遮断される第１ポ
ンプポート２７と第１アクチュエータポート２９を形成
し、そのスプール孔２１に第２スプール２３で連通・遮
断される第２ポンプポート２８と第２アクチュエータポ
ート３０と第２タンクポート３２を形成し、 前記第１スプール２２を弁ブロック２０の左右の一端部
に設けた第１スプリング３６で各ポートを遮断する中立
位置に保持し、この第１スプリング３６側に形成した第
１受圧室３７の圧油で第１ポンプポート２７と第１アク
チュエータポート２９を連通する第１位置に移動するよ
うにし、 前記第２スプール２３を弁ブロック２０の左右他端部に
設けたスプリングで各ポートを遮断する中立位置に保持
し、このスプリング側に形成した第２受圧室４７の圧油
で第２ポンプポート２８と第２アクチュエータポート３
０を連通し、かつ第２アクチュエータポート３０と第２
タンクポート３２を遮断する第１位置に移動し、前記ス
プリング側に形成した第３受圧室４８の圧油で第２アク
チュエータポート３０と第２タンクポート３２に連通
し、かつ第２アクチュエータポート３０と第２ポンプポ
ート２８を遮断する第２位置に移動する構成とした流量
応援用方向制御弁。1. The first and second spools 22, 23 are fitted and inserted on the left and right sides of a spool hole 21 of a valve block 20, and a first pump port 27 and a first pump port 27, which are communicated with and cut off from the spool hole 21 by the first spool 22. A first actuator port 29 is formed, and a second pump port 28, a second actuator port 30, and a second tank port 32, which are communicated with and cut off by the second spool 23, are formed in the spool hole 21 of the first actuator port 29. The first springs 36 provided at the left and right ends of the valve block 20 hold the neutral position to block each port, and the pressure oil in the first pressure receiving chamber 37 formed on the first spring 36 side is used to press the first pump port 27. And the first actuator port 29 are communicated with each other so as to move to a first position, and the second spool 23 is provided with a spring provided at the other left and right ends of the valve block 20. Held in a neutral position to block the port, a second pump port 28 in the pressure oil in the second pressure receiving chamber 47 formed on the spring-side second actuator port 3
0 in communication with the second actuator port 30 and the second actuator port 30.
The tank is moved to a first position that shuts off the tank port 32, the second actuator port 30 and the second tank port 32 are communicated with the second actuator port 30 by the pressure oil of the third pressure receiving chamber 48 formed on the spring side, and A flow control directional control valve configured to move to a second position that shuts off the second pump port 28.
ともに、ポンプポートとアクチュエータポートの連通、
遮断、アクチュエータポートとタンクポートの連通、遮
断を可能にした請求項１記載の流量応援用方向制御弁。2. A communication between a pump port and an actuator port, together with the first spool 22 and the second spool 23,
The flow control directional control valve according to claim 1, which is capable of shutting off, communicating between the actuator port and the tank port, and shutting off.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20069593A JP3289852B2 (en) | 1993-08-12 | 1993-08-12 | Direction control valve for flow rate support |
| PCT/JP1994/001335 WO1995005546A1 (en) | 1993-08-12 | 1994-08-11 | Flow rate servicing directional control valve for hydraulic circuit |
| US08/583,020 US5692427A (en) | 1993-08-12 | 1994-08-11 | Flow reinforcement directional control valve for a hydraulic circuit |
| DE4496042A DE4496042C2 (en) | 1993-08-12 | 1994-08-11 | Directional control valve for a hydraulic circuit |
| GB9525538A GB2295859B (en) | 1993-08-12 | 1994-08-11 | Flow rate servicing directional control valve for hydraulic circuit |
| DE19944496042 DE4496042T1 (en) | 1993-08-12 | 1994-08-11 | Flow-increasing directional valve for a hydraulic circuit |
| KR1019960700585A KR960704165A (en) | 1993-08-12 | 1996-01-31 | Flow rate servicing directional control valve for hydraulic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20069593A JP3289852B2 (en) | 1993-08-12 | 1993-08-12 | Direction control valve for flow rate support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0755031A true JPH0755031A (en) | 1995-03-03 |
| JP3289852B2 JP3289852B2 (en) | 2002-06-10 |
Family
ID=16428708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20069593A Expired - Lifetime JP3289852B2 (en) | 1993-08-12 | 1993-08-12 | Direction control valve for flow rate support |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3289852B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000088118A (en) * | 1998-09-17 | 2000-03-31 | Nabco Ltd | Switch valve |
| JP2003020693A (en) * | 2001-07-09 | 2003-01-24 | Yanmar Co Ltd | Hydraulic system for excavating revolving work vehicle |
| JP2005083476A (en) * | 2003-09-09 | 2005-03-31 | Hitachi Constr Mach Co Ltd | Hydraulic drive |
| CN1328516C (en) * | 2004-02-24 | 2007-07-25 | 沃尔沃建造设备控股（瑞典）有限公司 | Flow control apparatus for construction heavy equipment |
| JP2011503479A (en) * | 2007-11-14 | 2011-01-27 | ハイダック フィルターテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Hydraulic valve device |
| WO2014115469A1 (en) * | 2013-01-24 | 2014-07-31 | カヤバ工業株式会社 | Fluid pressure control device |
| CN105587702A (en) * | 2014-11-11 | 2016-05-18 | 纳博特斯克有限公司 | Direction converter valve |
| CN110319068A (en) * | 2018-03-29 | 2019-10-11 | 罗伯特·博世有限公司 | Valve gear with main slide valve and two spool control valves |
| US10859175B2 (en) | 2016-06-10 | 2020-12-08 | Kawasaki Jukogyo Kabushiki Kaisha | Flow control valve apparatus |
-
1993
- 1993-08-12 JP JP20069593A patent/JP3289852B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000088118A (en) * | 1998-09-17 | 2000-03-31 | Nabco Ltd | Switch valve |
| JP2003020693A (en) * | 2001-07-09 | 2003-01-24 | Yanmar Co Ltd | Hydraulic system for excavating revolving work vehicle |
| JP2005083476A (en) * | 2003-09-09 | 2005-03-31 | Hitachi Constr Mach Co Ltd | Hydraulic drive |
| CN1328516C (en) * | 2004-02-24 | 2007-07-25 | 沃尔沃建造设备控股（瑞典）有限公司 | Flow control apparatus for construction heavy equipment |
| JP2011503479A (en) * | 2007-11-14 | 2011-01-27 | ハイダック フィルターテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Hydraulic valve device |
| WO2014115469A1 (en) * | 2013-01-24 | 2014-07-31 | カヤバ工業株式会社 | Fluid pressure control device |
| JP2014142025A (en) * | 2013-01-24 | 2014-08-07 | Kayaba Ind Co Ltd | Fluid pressure control apparatus |
| US9797117B2 (en) | 2013-01-24 | 2017-10-24 | Kyb Corporation | Fluid pressure control device |
| CN105587702A (en) * | 2014-11-11 | 2016-05-18 | 纳博特斯克有限公司 | Direction converter valve |
| US10859175B2 (en) | 2016-06-10 | 2020-12-08 | Kawasaki Jukogyo Kabushiki Kaisha | Flow control valve apparatus |
| CN110319068A (en) * | 2018-03-29 | 2019-10-11 | 罗伯特·博世有限公司 | Valve gear with main slide valve and two spool control valves |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3289852B2 (en) | 2002-06-10 |
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