JP2764683B2 - Flow rate support circuit of pressure oil supply device - Google Patents
Flow rate support circuit of pressure oil supply deviceInfo
- Publication number
- JP2764683B2 JP2764683B2 JP5201607A JP20160793A JP2764683B2 JP 2764683 B2 JP2764683 B2 JP 2764683B2 JP 5201607 A JP5201607 A JP 5201607A JP 20160793 A JP20160793 A JP 20160793A JP 2764683 B2 JP2764683 B2 JP 2764683B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control valve
- directional control
- valve
- 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
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
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、１つの油圧ポンプの吐
出圧油を複数の油圧アクチュエータに供給する圧油供給
装置において特定の油圧アクチューエタに大流量を供給
する流量応援回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate assisting circuit for supplying a large flow rate to a specific hydraulic actuator in a pressure oil supply device for supplying a discharge pressure oil of one hydraulic pump to a plurality of hydraulic actuators.
【０００２】[0002]
【従来の技術】１つの油圧ポンプの吐出圧油を複数の油
圧アクチュエータに供給するには、油圧ポンプの吐出路
に複数の操作弁を設け、その操作弁を切換えることで各
油圧アクチュエータに圧油を供給すれば良いが、このよ
うにすると複数の油圧アクチュエータに圧油を同時に供
給する際に、負荷の小さな油圧アクチュエータにのみ圧
油が供給されて負荷の大きな油圧アクチュエータに圧油
が供給されなくなってしまう。2. Description of the Related Art In order to supply the hydraulic pressure discharged from one hydraulic pump to a plurality of hydraulic actuators, a plurality of operating valves are provided in the discharge path of the hydraulic pump, and the operating valves are switched to apply hydraulic oil to each hydraulic actuator. In this case, when supplying hydraulic oil to a plurality of hydraulic actuators at the same time, pressure oil is supplied only to hydraulic actuators with a small load, and hydraulic oil is not supplied to hydraulic actuators with a large load. Would.
【０００３】このことで解消する圧油供給装置としては
図１に示すものが知られている。すなわち、図１に示す
ように、油圧ポンプ１０は斜板１１の角度を変更するこ
とで容量、つまり１回転当たり吐出流量が変化する可変
容量型の油圧ポンプとなり、その斜板１１は大径ピスト
ン１２で容量減方向に傾動し、小径ピストン１３で容量
増方向に傾動する。前記大径ピストン１２の受圧室１２
ａは切換弁１４で油圧ポンプ１０の吐出路１０ａに連通
・遮断され、小径ピストン１３の受圧室１３ａは前記吐
出路１０ａに接続してある。FIG. 1 shows a known pressure oil supply device that solves this problem. That is, as shown in FIG. 1, the hydraulic pump 10 is a variable displacement hydraulic pump in which the displacement, that is, the discharge flow rate per rotation, is changed by changing the angle of the swash plate 11, and the swash plate 11 has a large-diameter piston. 12 tilts in the capacity decreasing direction, and the small diameter piston 13 tilts in the capacity increasing direction. The pressure receiving chamber 12 of the large-diameter piston 12
Reference numeral a denotes a switching valve 14 which is communicated with and blocked from the discharge passage 10a of the hydraulic pump 10, and the pressure receiving chamber 13a of the small diameter piston 13 is connected to the discharge passage 10a.
【０００４】前記油圧ポンプ１０の吐出路１０ａには複
数の方向制御弁１５が設けてあり、各方向制御弁１５と
油圧アクチュエータ１６を接続する回路１７に圧力補償
弁１８がそれぞれ設けてあり、該圧力補償弁１８は第１
受圧部１９の圧油で低圧セット側に押され、第２受圧部
２０の圧油で高圧セット側に押される構成としてあり、
第１受圧部１９は方向制御弁１５の出口側に接続して出
口側圧力が供給され、第２受圧部２０はシャトル弁２１
を経て各回路１７に接続されて最も高い負荷圧が供給さ
れる。A plurality of directional control valves 15 are provided in the discharge path 10a of the hydraulic pump 10, and a pressure compensating valve 18 is provided in a circuit 17 connecting each directional control valve 15 and a hydraulic actuator 16, respectively. The pressure compensating valve 18 is the first
It is configured to be pushed to the low pressure set side by the pressure oil of the pressure receiving portion 19 and pushed to the high pressure set side by the pressure oil of the second pressure receiving portion 20,
The first pressure receiving portion 19 is connected to the outlet side of the direction control valve 15 to supply the outlet side pressure, and the second pressure receiving portion 20 is connected to the shuttle valve 21.
, And is connected to each circuit 17 to supply the highest load pressure.
【０００５】前記切換弁１４は吐出路１０ａ内の圧力で
連通方向に押され、バネ２２と前記負荷圧でドレーン方
向に押されて、吐出圧力Ｐ1 が高くなると大径ピストン
１２の受圧室１２ａに吐出圧を供給して斜板１１を容量
減方向に傾動し、吐出圧力Ｐ1 が低くなると大径ピスト
ン１２の受圧室１２ａをタンク側に流出して斜板１１を
容量増方向に傾動する。[0005] The switching valve 14 is pushed in the communication direction by a pressure in the discharge passage 10a, is pushed in the drain direction at the load pressure and the spring 22, the discharge pressure P 1 is increased when the pressure-receiving chamber 12a of the large diameter piston 12 by supplying discharge pressure to tilt the swash plate 11 in the volume decrease direction, tilts the swash plate 11 from flowing out to the tank side pressure receiving chamber 12a of the large diameter piston 12 when the discharge pressure P 1 becomes lower in the capacity increase direction .
【０００６】前記負荷圧を切換弁１４の受圧部１４ａに
供給する回路２３、つまり、受圧部１４ａとシャトル弁
２１の出力側を接続する回路２３は絞り２４を経てタン
ク２５に接続している。A circuit 23 for supplying the load pressure to the pressure receiving portion 14a of the switching valve 14, that is, a circuit 23 for connecting the pressure receiving portion 14a to the output side of the shuttle valve 21, is connected to a tank 25 via a throttle 24.
【０００７】かかる圧油供給装置であれば各方向制御弁
１５を中立位置ａから供給位置ｂに切換えると油圧ポン
プ１０の吐出圧油が油圧アクチュエータ１６に供給され
ると共に、高い方の負荷圧がシャトル弁２１で検出され
て圧力補償弁１８の第２受圧部２０にそれぞれ作用し、
各圧力補償弁１８を最も高い負荷圧によりセットされる
から、油圧ポンプ１０の吐出圧油を負荷の異なる複数の
油圧アクチュエータに供給できる。In such a pressure oil supply device, when each directional control valve 15 is switched from the neutral position a to the supply position b, the discharge pressure oil of the hydraulic pump 10 is supplied to the hydraulic actuator 16 and the higher load pressure is reduced. It is detected by the shuttle valve 21 and acts on the second pressure receiving portion 20 of the pressure compensating valve 18 respectively.
Since each pressure compensating valve 18 is set at the highest load pressure, the discharge pressure oil of the hydraulic pump 10 can be supplied to a plurality of hydraulic actuators having different loads.
【０００８】[0008]
【発明が解決しようとする課題】かかる圧油供給装置に
おいてはシャトル弁２１で検出した最も高い負荷圧が切
換弁１４の受圧部１４ａに作用して切換弁１４を作動し
て油圧ポンプ１０の容量を制御し、ポンプ吐出圧Ｐ1 と
負荷圧ＰLSとの差圧が常時一定となるようにしている。In such a pressure oil supply device, the highest load pressure detected by the shuttle valve 21 acts on the pressure receiving portion 14a of the switching valve 14 to actuate the switching valve 14 so that the capacity of the hydraulic pump 10 is increased. Is controlled so that the differential pressure between the pump discharge pressure P 1 and the load pressure P LS is always constant.
【０００９】このようであるから、油圧アクチュエータ
１６への供給流量は方向制御弁１５のメータイン開口面
積によって決定され、特定の油圧アクチュエータ１６、
例えばパワーショベルのブームシリンダ、アームシリン
ダに大流量を供給する場合には、その方向制御弁を大型
としてメータイン開口面積を大きくするか、前述のポン
プ吐出圧Ｐ1 と負荷圧ＰLSの差圧を大きくする必要があ
る。Therefore, the supply flow rate to the hydraulic actuator 16 is determined by the meter-in opening area of the directional control valve 15, and the specific hydraulic actuator 16
For example, a power shovel boom cylinder, when supplying large flow rate to the arm cylinder, increase the meter opening area that directional control valve as a large, the differential pressure of the load pressure P LS between the pump discharge pressure P 1 of the aforementioned Need to be bigger.
【００１０】しかしながら、方向制御弁１５を大型とす
ると他の方向制御弁と大きさが異なって兼用できずにコ
ストが高くなるし、ポンプ吐出圧と負荷圧の差圧を大き
くするとポンプ吐出圧が高くなり過ぎて油圧ポンプ駆動
力のロスが大となって好ましくない。However, if the size of the directional control valve 15 is large, the size of the directional control valve is different from that of the other directional control valves, so that the size of the directional control valve 15 cannot be used. Therefore, the cost increases. It becomes too high and the loss of the hydraulic pump driving force becomes large, which is not preferable.
【００１１】そこで、本発明は前述の課題を解決できる
ようにした圧油供給装置の流量応援回路を提供すること
を目的とする。Accordingly, an object of the present invention is to provide a flow rate assisting circuit of a pressure oil supply device which can solve the above-mentioned problems.
【００１２】[0012]
【課題を解決するための手段】油圧ポンプ１０の吐出路
１０ａに複数の方向制御弁１５を設け、この各方向制御
弁１５の出口側を圧力補償弁１８を経て油圧アクチュエ
ータ１６にそれぞれ接続し、この各圧力補償弁１８をポ
ンプ吐出圧と各油圧アクチュエータ１６の最高負荷圧に
よりセットするようにした圧油供給装置において、前記
油圧ポンプ１０の吐出路１０ａに補助方向制御弁３０を
設け、この補助方向制御弁３０の出口側を圧力補償弁１
８を介して特定の方向制御弁１５に接続した特定の油圧
アクチュエータ１６に接続した圧油供給装置の流量応援
回路。油圧ポンプ１０の吐出路１０ａに複数の圧力補償
弁１８を設け、この各圧力補償弁１８の出口側に方向制
御弁１５をそれぞれ設けて各油圧アクチュエータ１６に
圧油を供給するようにし、前記各圧力補償弁１８をポン
プ吐出圧と各油圧アクチュエータ１６の最高負荷圧によ
りセットするようにした圧油供給装置において、前記特
定の圧力補償弁１８の出口側に補助方向制御弁３０を前
記方向制御弁１５と並列に設け、この補助方向制御弁３
０の出口側を前記方向制御弁１５に接続した特定の油圧
アクチュエータ１６に接続した圧油供給装置の流量応援
回路。A plurality of directional control valves 15 are provided in a discharge passage 10a of a hydraulic pump 10, and the outlet side of each directional control valve 15 is connected to a hydraulic actuator 16 via a pressure compensating valve 18, respectively. In the pressure oil supply device in which each pressure compensating valve 18 is set by the pump discharge pressure and the maximum load pressure of each hydraulic actuator 16, an auxiliary direction control valve 30 is provided in the discharge path 10a of the hydraulic pump 10, The outlet side of the directional control valve 30 is connected to the pressure compensating valve 1
A flow assist circuit of the pressure oil supply device connected to a specific hydraulic actuator 16 connected to a specific direction control valve 15 via 8. A plurality of pressure compensating valves 18 are provided in a discharge path 10a of the hydraulic pump 10, and a directional control valve 15 is provided at an outlet side of each pressure compensating valve 18 so as to supply pressure oil to each hydraulic actuator 16; In the pressure oil supply device in which the pressure compensating valve 18 is set by the pump discharge pressure and the maximum load pressure of each hydraulic actuator 16, an auxiliary directional control valve 30 is provided at the outlet side of the specific pressure compensating valve 18 by the directional control valve. 15 in parallel with the auxiliary directional control valve 3
A flow assist circuit of the pressure oil supply device in which the outlet side of the zero is connected to a specific hydraulic actuator 16 connected to the direction control valve 15.
【００１３】[0013]
【作 用】特定の方向制御弁１５から特定の油圧アク
チュエータ１６に圧油を供給する際に補助方向制御弁３
０よりその特定の油圧アクチュエータ１６に圧油を供給
できるから、特定の油圧アクチュエータ１６に大流量を
供給できるし、特定の方向制御弁１５を他の方向制御弁
１５の同一大きさにできて兼用できるからコストを安く
でき、しかもポンプ吐出圧と負荷圧の差圧を大きくしな
くとも良いから油圧ポンプ駆動力のロスを低減できる。[Operation] When supplying hydraulic oil from a specific directional control valve 15 to a specific hydraulic actuator 16, the auxiliary directional control valve 3 is used.
Since the pressure oil can be supplied to the specific hydraulic actuator 16 from 0, a large flow rate can be supplied to the specific hydraulic actuator 16, and the specific directional control valve 15 can be made the same size as the other directional control valves 15. As a result, the cost can be reduced, and the difference between the pump discharge pressure and the load pressure does not need to be increased, so that the loss of the hydraulic pump driving force can be reduced.
【００１４】[0014]
【実 施 例】本発明の実施例を図２以降を参照して説
明する。なお、従来と同一部材は同一符号とする。な
お、説明の簡素化のため圧力補償弁１８は一方の回路１
７にのみ設け、他方の回路には図示を省略してある。図
２に示すように油圧ポンプ１０の吐出路１０ａに補助方
向制御弁３０を設け、この補助方向制御弁３０の第１ア
クチュエータポート３１を圧力補償弁１８を経て一方の
油圧アクチュエータ１６の回路１７に接続してある。前
記補助方向制御弁３０は第１・第２アクチュエータポー
ト３１，３２とポンプポート３３とタンクポート３４を
有し、各ポートを遮断する中立位置ｃ、ポンプポート３
３を第１アクチュエータポート３１に連通し、かつ第２
アクチュエータポート３２をタンクポート３４に連通す
る第１位置ｄ、ポンプポート３３を第２アクチュエータ
ポート３２に連通し、かつ第１アクチュエータポート３
１をタンクポート３４に連通する第２位置ｅに切換えら
れる。Embodiment An embodiment of the present invention will be described with reference to FIGS. The same members as those in the related art are denoted by the same reference numerals. In order to simplify the explanation, the pressure compensating valve 18 is connected to one circuit 1
7 and the other circuit is not shown. As shown in FIG. 2, an auxiliary direction control valve 30 is provided in the discharge path 10a of the hydraulic pump 10, and the first actuator port 31 of the auxiliary direction control valve 30 is connected to the circuit 17 of one hydraulic actuator 16 via the pressure compensating valve 18. Connected. The auxiliary directional control valve 30 has first and second actuator ports 31 and 32, a pump port 33 and a tank port 34, a neutral position c for shutting off each port, a pump port 3
3 to the first actuator port 31 and the second
A first position d for communicating the actuator port 32 with the tank port 34, a pump port 33 for communicating with the second actuator port 32, and a first actuator port 3;
1 is switched to the second position e communicating with the tank port 34.
【００１５】パイロットバルブ４０はパイロット用油圧
ポンプ４１の吐出圧油を第１・第２パイロット回路４
２，４３に供給するもので、その第１パイロット回路４
２は前記補助方向制御弁３０の第１受圧部３０ａと一方
（右側）の方向制御弁１５の第１受圧部１５ａに接続
し、第２パイロット回路４３は補助方向制御弁３０の第
２受圧部３０ｂと一方（右側）の方向制御弁１５の第２
受圧部１５ｂに接続している。The pilot valve 40 supplies the pressure oil discharged from the pilot hydraulic pump 41 to the first and second pilot circuits 4.
2, 43, and the first pilot circuit 4
2 is connected to the first pressure receiving portion 30a of the auxiliary direction control valve 30 and the first pressure receiving portion 15a of the one (right) direction control valve 15, and the second pilot circuit 43 is connected to the second pressure receiving portion of the auxiliary direction control valve 30. 30b and the second of the one (right) directional control valve 15
It is connected to the pressure receiving part 15b.
【００１６】このようであるから、パイロットバルブ４
０により第１パイロット回路４２にパイロット圧油を供
給すると一方の方向制御弁１５が右方の供給位置ｂ、補
助方向切換弁３０が第１位置ｄとなり、油圧ポンプ１０
の吐出圧油は一方の方向制御弁１５と補助方向制御弁３
０より一方（右側）の油圧アクチュエータ１６に供給さ
れ、その戻り油は一方の方向制御弁１５よりタンクに流
出する。したがって、一方の油圧アクチュエータ１６の
伸び室１６ａへの供給流量は一方の方向制御弁１５と補
助方向制御弁３０のメータイン開口面積の和に比例する
から大流量を供給できる。Because of this, the pilot valve 4
0, the pilot pressure oil is supplied to the first pilot circuit 42 so that the one directional control valve 15 is at the right supply position b, the auxiliary direction switching valve 30 is at the first position d, and the hydraulic pump 10
Is discharged from one directional control valve 15 and the auxiliary directional control valve 3
The return oil is supplied to one (right side) hydraulic actuator 16 from 0, and the return oil flows out from one directional control valve 15 to the tank. Therefore, a large flow rate can be supplied because the flow rate of supply to the extension chamber 16a of one hydraulic actuator 16 is proportional to the sum of the meter-in opening areas of the one direction control valve 15 and the auxiliary direction control valve 30.
【００１７】パイロット弁４０により第２パイロット回
路４３にパイロット圧油を供給した時に一方の方向制御
弁１５が左方の供給位置ｂ、補助方向制御弁３０が第２
位置ｅとなるが、補助方向制御弁３０が第２位置ｅの時
にはポンプポート３３が第２アクチュエータポート３２
に連通して回路１７に圧油を供給しないので一方の方向
制御弁１５のみより一方（右側）の圧油アクチュエータ
１６に供給されて縮み室１６ｂへの供給流量は小とな
る。When the pilot pressure oil is supplied to the second pilot circuit 43 by the pilot valve 40, one of the directional control valves 15 is in the left supply position b, and the auxiliary directional control valve 30 is in the second supply position.
When the auxiliary direction control valve 30 is in the second position e, the pump port 33 is in the second actuator port 32.
Is supplied to the pressure oil actuator 16 on one side (right side) from only one directional control valve 15 and the supply flow rate to the contraction chamber 16b becomes small.
【００１８】図３は第２実施例を示し、油圧アクチュエ
ータ１６はパワーショベルのブームシリンダとなり、補
助方向制御弁３０はばね５０で遮断位置ｆに保持され、
受圧部５１の圧力で連通位置ｇとなる構造であって、そ
の受圧部５１は第１パイロット回路４２に接続してあ
り、圧力補償弁１８の出力側にはチェック弁５２が設け
てある。FIG. 3 shows a second embodiment, in which the hydraulic actuator 16 is a boom cylinder of a power shovel, and the auxiliary direction control valve 30 is held at a shut-off position f by a spring 50.
The pressure receiving portion 51 has a structure in which the communication position g is established by the pressure of the pressure receiving portion 51. The pressure receiving portion 51 is connected to the first pilot circuit 42, and a check valve 52 is provided on the output side of the pressure compensating valve 18.
【００１９】このように、一方の油圧アクチュエータ１
６の伸び室１６ａに大流量を供給できるから、例えばパ
ワーショベルのブームシリンダ、アームシリンダを高圧
で速く作動できてブーム上、アーム掘削時に有利とな
る。As described above, one hydraulic actuator 1
Since a large flow rate can be supplied to the extension chamber 16a of the sixth excavator, for example, the boom cylinder and the arm cylinder of the power shovel can be quickly operated at high pressure, which is advantageous when the arm is excavated on the boom.
【００２０】図４は第２実施例を示し、補助方向制御弁
３０の第２アクチュエータポート３２を回路４４で一方
の油圧アクチュエータ１６の縮み室１６ｂに接続してあ
る。このようにすれば、前述と同様に一方の油圧アクチ
ュエータ１６の縮み室１６ｂに補助方向制御弁３０より
圧油を供給できる。FIG. 4 shows a second embodiment in which the second actuator port 32 of the auxiliary directional control valve 30 is connected to the contraction chamber 16b of one hydraulic actuator 16 by a circuit 44. By doing so, the pressurized oil can be supplied from the auxiliary direction control valve 30 to the contraction chamber 16b of the one hydraulic actuator 16 as described above.
【００２１】以上の各実施例は圧力補償弁１８を方向制
御弁１５と油圧アクチュエータ１６との間に設けたが、
図５と図６に示すように油圧ポンプ１０と方向制御弁１
５との間に圧力補償弁１８を設けても良い。In each of the above embodiments, the pressure compensating valve 18 is provided between the directional control valve 15 and the hydraulic actuator 16.
As shown in FIGS. 5 and 6, the hydraulic pump 10 and the directional control valve 1
5, a pressure compensating valve 18 may be provided.
【００２２】つまり、図５に示すように圧力補償弁１８
の出力側を回路５０で分岐し、この管路５０に補助方向
制御弁３０を設け、この補助方向制御弁３０の第１アク
チュエータポート３１を回路５１で回路１７に接続すれ
ば良い。また、図６に示すように補助方向制御弁３０の
第２アクチュエータポート３２を回路４４で油圧アクチ
ュエータ１６の縮み室１６ｂに接続すれば良い。That is, as shown in FIG.
The output side is branched by a circuit 50, an auxiliary direction control valve 30 is provided in the pipe 50, and the first actuator port 31 of the auxiliary direction control valve 30 may be connected to the circuit 17 by a circuit 51. 6, the second actuator port 32 of the auxiliary direction control valve 30 may be connected to the contraction chamber 16b of the hydraulic actuator 16 by a circuit 44.
【００２３】[0023]
【発明の効果】特定の方向制御弁１５から特定の油圧ア
クチュエータ１６に圧油を供給する際に補助方向制御弁
３０よりその特定の油圧アクチュエータ１６に圧油を供
給できる。したがって、特定の油圧アクチュエータ１６
に大流量を供給できるし、特定の方向制御弁１５を他の
方向制御弁１５の同一大きさにできて兼用できるからコ
ストを安くでき、しかもポンプ吐出圧と負荷圧の差圧を
大きくしなくとも良いから油圧ポンプ駆動力のロスを低
減できる。When the pressure oil is supplied from the specific directional control valve 15 to the specific hydraulic actuator 16, the auxiliary hydraulic control valve 30 can supply the pressure oil to the specific hydraulic actuator 16. Therefore, a specific hydraulic actuator 16
A large flow rate, and a specific directional control valve 15 can be made the same size as the other directional control valves 15 so that the cost can be reduced and the differential pressure between the pump discharge pressure and the load pressure is not increased. Therefore, the loss of the hydraulic pump driving force can be reduced.
【図１】従来例の説明図である。FIG. 1 is an explanatory diagram of a conventional example.
【図２】本発明の第１実施例を示す説明図である。FIG. 2 is an explanatory diagram showing a first embodiment of the present invention.
【図３】本発明の第２実施例を示す説明図である。FIG. 3 is an explanatory view showing a second embodiment of the present invention.
【図４】本発明の第３実施例を示す説明図である。FIG. 4 is an explanatory view showing a third embodiment of the present invention.
【図５】本発明の第４実施例を示す説明図である。FIG. 5 is an explanatory view showing a fourth embodiment of the present invention.
【図６】本発明の第５実施例を示す説明する。FIG. 6 is a diagram illustrating a fifth embodiment of the present invention.
１０…油圧ポンプ、１０ａ…吐出路、１５…方向制御
弁、１６…油圧アクチュエータ、１８…圧力補償弁、３
０…補助方向制御弁、４０…パイロットバルブ。DESCRIPTION OF SYMBOLS 10 ... Hydraulic pump, 10a ... Discharge path, 15 ... Direction control valve, 16 ... Hydraulic actuator, 18 ... Pressure compensation valve, 3
0: auxiliary direction control valve, 40: pilot valve.
フロントページの続き (56)参考文献 特開 平２−125034（ＪＰ，Ａ) 特開 平２−212603（ＪＰ，Ａ) 特開 平５−52203（ＪＰ，Ａ) 特開 平５−272504（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) F15B 11/00 E02F 9/22 F15B 11/04 F15B 11/05Continuation of front page (56) References JP-A-2-125034 (JP, A) JP-A-2-212603 (JP, A) JP-A-5-52203 (JP, A) JP-A-5-272504 (JP) , A) (58) Fields investigated (Int. Cl. 6 , DB name) F15B 11/00 E02F 9/22 F15B 11/04 F15B 11/05
Claims (3)
方向制御弁１５を設け、この各方向制御弁１５の出口側
を圧力補償弁１８を経て油圧アクチュエータ１６にそれ
ぞれ接続し、この各圧力補償弁１８をポンプ吐出圧と各
油圧アクチュエータ１６の最高負荷圧によりセットする
ようにした圧油供給装置において、 前記油圧ポンプ１０の吐出路１０ａに補助方向制御弁３
０を設け、この補助方向制御弁３０の出口側を圧力補償
弁１８を介して特定の方向制御弁１５に接続した特定の
油圧アクチュエータ１６に接続したことを特徴とする圧
油供給装置の流量応援回路。1. A plurality of directional control valves 15 are provided in a discharge path 10a of a hydraulic pump 10, and the outlet side of each of the directional control valves 15 is connected to a hydraulic actuator 16 via a pressure compensating valve 18, respectively. In the pressure oil supply device in which the valve 18 is set according to the pump discharge pressure and the maximum load pressure of each hydraulic actuator 16, the auxiliary directional control valve 3 is connected to the discharge path 10 a of the hydraulic pump 10.
0, and the outlet side of the auxiliary directional control valve 30 is connected to a specific hydraulic actuator 16 connected to a specific directional control valve 15 via a pressure compensating valve 18. circuit.
圧力補償弁１８を設け、この各圧力補償弁１８の出口側
に方向制御弁１５をそれぞれ設けて各油圧アクチュエー
タ１６に圧油を供給するようにし、前記各圧力補償弁１
８をポンプ吐出圧と各油圧アクチュエータ１６の最高負
荷圧によりセットするようにした圧油供給装置におい
て、 前記特定の圧力補償弁１８の出口側に補助方向制御弁３
０を前記方向制御弁１５と並列に設け、この補助方向制
御弁３０の出口側を前記方向制御弁１５に接続した特定
の油圧アクチュエータ１６に接続したことを特徴とする
圧油供給装置の流量応援回路。2. A plurality of pressure compensating valves (18) are provided in a discharge path (10a) of a hydraulic pump (10), and directional control valves (15) are provided at outlets of the respective pressure compensating valves (18) to supply pressure oil to each hydraulic actuator (16). So that each of the pressure compensating valves 1
8 is set according to the pump discharge pressure and the maximum load pressure of each hydraulic actuator 16, wherein the auxiliary direction control valve 3 is provided at the outlet side of the specific pressure compensating valve 18.
0 is provided in parallel with the directional control valve 15, and the outlet side of the auxiliary directional control valve 30 is connected to a specific hydraulic actuator 16 connected to the directional control valve 15. circuit.
３０を同時に切換えるパイロットバルブ４０を設けた請
求項１又は請求項２記載の圧油供給装置の流量応援回
路。3. The flow rate assisting circuit of a pressure oil supply device according to claim 1, further comprising a pilot valve for simultaneously switching a specific direction control valve and an auxiliary direction control valve.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5201607A JP2764683B2 (en) | 1993-08-13 | 1993-08-13 | Flow rate support circuit of pressure oil supply device |
| GB9600385A GB2294978B (en) | 1993-08-13 | 1994-08-12 | Flow control device for hydraulic circuit |
| PCT/JP1994/001346 WO1995005545A1 (en) | 1993-08-13 | 1994-08-12 | Flow control device for hydraulic circuit |
| DE4496043T DE4496043T1 (en) | 1993-08-13 | 1994-08-12 | Flow control loop in a hydraulic circuit |
| US08/583,017 US6026730A (en) | 1993-08-13 | 1994-08-12 | Flow control apparatus in a hydraulic circuit |
| KR1019960700368A KR960704164A (en) | 1993-08-13 | 1996-01-19 | Flow control apparatus in a hydralic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5201607A JP2764683B2 (en) | 1993-08-13 | 1993-08-13 | Flow rate support circuit of pressure oil supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0754804A JPH0754804A (en) | 1995-02-28 |
| JP2764683B2 true JP2764683B2 (en) | 1998-06-11 |
Family
ID=16443866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5201607A Expired - Lifetime JP2764683B2 (en) | 1993-08-13 | 1993-08-13 | Flow rate support circuit of pressure oil supply device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2764683B2 (en) |
-
1993
- 1993-08-13 JP JP5201607A patent/JP2764683B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0754804A (en) | 1995-02-28 |
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