JP2593967Y2 - Pressure compensation valve - Google Patents
Pressure compensation valveInfo
- Publication number
- JP2593967Y2 JP2593967Y2 JP1992075260U JP7526092U JP2593967Y2 JP 2593967 Y2 JP2593967 Y2 JP 2593967Y2 JP 1992075260 U JP1992075260 U JP 1992075260U JP 7526092 U JP7526092 U JP 7526092U JP 2593967 Y2 JP2593967 Y2 JP 2593967Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- port
- valve
- pressure chamber
- chamber
- 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
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- Fluid-Pressure Circuits (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、１つの油圧ポンプの吐
出圧油を複数のアクチュエータに流量分配して供給する
油圧回路等に用いられる圧力補償弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure compensating valve used in a hydraulic circuit or the like for distributing and supplying a discharge pressure oil of one hydraulic pump to a plurality of 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ア
クチュエータに供給すると、負荷圧の低いアクチュエー
タにのみ圧油が供給されてしまうので、例えば特開昭６
０−１１７０６号公報に示す油圧回路が知られている。
すなわち各アクチュエータに接続した方向制御弁の入口
側に圧力補償弁をそれぞれ設け、各圧力補償弁を各アク
チュエータの負荷圧における最も高い負荷圧でセット
し、異なる負荷圧の複数のアクチュエータに油圧ポンプ
の吐出圧油を流量分配して供給できるようにした油圧回
路である。2. Description of the Related Art When the pressure oil discharged from one hydraulic pump is supplied to a plurality of actuators, the pressure oil is supplied only to the actuator having a low load pressure.
2. Description of the Related Art A hydraulic circuit disclosed in Japanese Patent Application No. 0-11706 is known.
That is, a pressure compensating valve is provided on the inlet side of the directional control valve connected to each actuator, and each pressure compensating valve is set at the highest load pressure among the load pressures of the actuators. This is a hydraulic circuit capable of distributing and supplying discharge pressure oil.
【０００３】かかる油圧回路に用いる圧力補償弁は高圧
側圧力室と低圧側圧力室の圧力差及び入口圧力と出口圧
力の圧力差によって出力圧を制御する構造であるから、
低圧側圧力室に最も高い負荷圧を導入する必要があり、
このために各アクチュエータの負荷圧を比較するシャト
ル弁が必要となる。A pressure compensating valve used in such a hydraulic circuit has a structure in which an output pressure is controlled by a pressure difference between a high pressure side pressure chamber and a low pressure side pressure chamber and a pressure difference between an inlet pressure and an outlet pressure.
It is necessary to introduce the highest load pressure into the low pressure side pressure chamber,
Therefore, a shuttle valve for comparing the load pressure of each actuator is required.
【０００４】そこで、本出願人は先に前述の課題を解決
できるようにした圧力補償弁を提案した。すなわち、図
１に示すように弁本体１に入口ポート２と出口ポート３
を連通・遮断する弁４を設けてチェック弁部５とし、前
記弁本体１に、第１ポート６に連通した第１圧力室７の
圧力で第２ポート８と第３ポート９を連通し、第３ポー
ト９に連通した第２圧力室１０の圧力で第２ポート８と
第３ポート９を遮断するスプール１１を設けて減圧弁部
１２とし、前記スプール１１をばね１３で第２ポート８
と第３ポート９を遮断する方向に押して前記弁４に当接
した圧力補償弁。Therefore, the present applicant has previously proposed a pressure compensating valve capable of solving the above-mentioned problem. That is, as shown in FIG.
A check valve portion 5 provided with a valve 4 for communicating and shutting off the second port 8 and the third port 9 with the valve body 1 by the pressure of the first pressure chamber 7 communicating with the first port 6; A pressure reducing valve section 12 is provided by providing a spool 11 for shutting off the second port 8 and the third port 9 by the pressure of the second pressure chamber 10 communicating with the third port 9, and the spool 11 is connected to the second port 8 by a spring 13.
And a pressure compensating valve which is pushed in a direction to shut off the third port 9 and abuts on the valve 4.
【０００５】かかる圧力補償弁であると、第１圧力室７
の圧力が第２圧力室１０の圧力よりも高い時にはスプー
ル１１が弁４より離れて入口ポート２の圧力と出口ポー
ト３の圧力が等しくなると共に、第１圧力室７の圧力と
第２圧力室１０の圧力が等しくなり、第１圧力室７の圧
力が第２圧力室１０の圧力よりも低い時にはスプール１
１で弁４が遮断方向に押されて出口ポート３の圧力が入
口ポート２の圧力よりも第２圧力室１０と第１圧力室７
の圧力差だけ低くなるから、負荷圧の異なるアクチュエ
ータの入口側に設けるこことでシャトル弁を用いずに各
アクチュエータに１つの油圧ポンプの吐出圧油を流量分
配して供給できる。With such a pressure compensating valve, the first pressure chamber 7
Is higher than the pressure in the second pressure chamber 10, the spool 11 is separated from the valve 4 so that the pressure in the inlet port 2 and the pressure in the outlet port 3 are equal, and the pressure in the first pressure chamber 7 and the pressure in the second pressure chamber 10 are equal. 10 when the pressure in the first pressure chamber 7 is lower than the pressure in the second pressure chamber 10
1, the valve 4 is pushed in the shut-off direction so that the pressure at the outlet port 3 is higher than the pressure at the inlet port 2 in the second pressure chamber 10 and the first pressure chamber 7.
Therefore, the hydraulic pressure discharged from one hydraulic pump can be distributed and supplied to each of the actuators without using a shuttle valve, provided at the inlet side of actuators having different load pressures.
【０００６】[0006]
【考案が解決しようとする課題】かかる圧力補償弁であ
ると、第１圧力室７の圧力と第２圧力室１０との圧力と
によって圧力補償特性の設定が決定されるので、アクチ
ュエータの種類に応じた圧力補償特性が得られない。With such a pressure compensating valve, the setting of the pressure compensating characteristic is determined by the pressure of the first pressure chamber 7 and the pressure of the second pressure chamber 10, so that the type of the actuator depends on the type of the actuator. A suitable pressure compensation characteristic cannot be obtained.
【０００７】そこで、本考案は前述の課題を解決できる
ようにした圧力補償を提供することを目的とする。Therefore, an object of the present invention is to provide a pressure compensation which can solve the above-mentioned problem.
【０００８】[0008]
【課題を解決するための手段】第１の考案は、弁本体２
０にチェック弁部２８と減圧弁部４２を設け、前記チェ
ック弁部２８は入口ポート２３と出口ポート２４を連通
・遮断する弁２５を設けてなり、前記減圧弁部３９は第
１・第２・第３ポート２９，３０，３１とスプール３３
を設けてなり、前記スプール３３は第１ポート２９に連
通した第１圧力室３４の圧力で第２ポート３０と第３ポ
ート３１を連通し、かつ、第３ポート３１に連通した第
２圧力室３５の圧力で第２ポート３０と第３ポート３１
を遮断し、ばね３８は、第２ポート３０と第３ポート３
１を遮断する方向にスプール３２を押し、前記出口ポー
ト２４は方向制御弁の入口側に接続し、前記入口ポート
２３と前記第２ポート３０にポンプ吐出側管路を接続
し、前記方向制御弁の出口側に接続した負荷圧導入路４
６を第１ポート２９に接続してなる圧力補償弁におい
て、第３圧力室３６を設け、スプール３３には常に第３
圧力室３６の圧力を受ける受圧部３３ｃを設け、前記第
３圧力室３６は、当該第３圧力室３６に作用する圧油で
前記スプール３３を、第２ポート３０と第３ポート３１
を連通する方向に押すべくしてなり、当該第３圧力室３
６を第１ポート２９と第３ポート３１に連通する切換弁
５０を備えたことを特徴とする圧力補償弁である。第２
の考案は、弁本体２０にチェック弁部２８と減圧弁部４
２を設け、前記チェック弁部２８は入口ポート２３と出
口ポート２４を連通・遮断する弁２５を設けてなり、前
記減圧弁部３９は第１・第２・第３ポート２９，３０，
３１とスプール３３を設けてなり、前記スプール３３は
第１ポート２９に連通した第１圧力室３４の圧力で第２
ポート３０と第３ポート３１を連通し、かつ、第３ポー
ト３１に連通した第２圧力室３５の圧力で第２ポート３
０と第３ポート３１を遮断し、ばね３８は、第２ポート
３０と第３ポート３１を遮断する方向にスプール３２を
押し、前記出口ポート２４は方向制御弁の入口側に接続
し、前記入口ポート２３と前記第２ポート３０にポンプ
吐出側管路を接続し、前記方向制御弁の出口側に接続し
た負荷圧導入路４６を第１ポート２９に接続してなる圧
力補償弁において、第３圧力室３６を設け、前記第３圧
力室３６は、当該第３圧力室３６に作用する圧油で前記
スプール３３を、第２ポート３０と第３ポート３１を連
通する方向に押すべくしてなり、前記第３圧力室３６を
第１ポート２９と第３ポート３１に連通する切換弁５０
を備え、第１圧力室３４の圧力と第２圧力室３５の圧力
を切換弁５０に導入し、この切換弁５０の出力圧を第３
圧力室３６に導入したことを特徴とする圧力補償弁であ
る。第３の考案は、弁本体２０にチェック弁部２８と減
圧弁部４２を設け、前記チェック弁部２８は入口ポート
２３と出口ポート２４を連通・遮断する弁２５を設けて
なり、前記減圧弁部３９は第１・第２・第３ポート２
９，３０，３１とスプール３３を設けてなり、前記スプ
ール３３は第１ポート２９に連通した第１圧力室３４の
圧力で第２ポート３０と第３ポート３１を連通し、か
つ、第３ポート３１に連通した第２圧力室３５の圧力で
第２ポート３０と第３ポート３１を遮断し、ばね３８
は、第２ポート３０と第３ポート３１を遮断する方向に
スプール３２を押し、前記出口ポート２４は方向制御弁
の入口側に接続し、前記入口ポート２３と前記第２ポー
ト３０にポンプ吐出側管路を接続し、前記方向制御弁の
出口側に接続した負荷圧導入路４６を第１ポート２９に
接続してなる圧力補償弁において、第３圧力室３６を設
け、スプール３３には常に第３圧力室３６の圧力を受け
る受圧部３３ｃを設け、前記第３圧力室３６は、当該第
３圧力室３６に作用する圧油で前記スプール３３を、第
２ポート３０と第３ポート３１を連通する方向に押すべ
くしてなり、当該第３圧力室３６を第１ポート２９と第
３ポート３１に連通する切換弁５０を備え、当該切換弁
５０を切換えることで前記負荷圧導入路４６から第１圧
力室３４に流入した圧力と前記第２圧力室３５内に流入
した圧力が第３圧力室３６に導入されるようにしたこと
を特徴とする圧力補償弁である。第４の考案は、第１又
は第２又は第３の考案において、前記切換弁５０を第１
ポート２９を第３圧力室３６に連通する第１位置Ａと、
第３ポート３１を第３圧力室３６に連通する第２位置Ｂ
に切換えるものとした圧力補償弁である。SUMMARY OF THE INVENTION The first invention is a valve body 2.
0, a check valve portion 28 and a pressure reducing valve portion 42 are provided, the check valve portion 28 is provided with a valve 25 for communicating and shutting off the inlet port 23 and the outlet port 24, and the pressure reducing valve portion 39 is provided with first and second valves.・ Third ports 29, 30, 31 and spool 33
The spool 33 communicates with the second port 30 and the third port 31 by the pressure of the first pressure chamber 34 that communicates with the first port 29, and the second pressure chamber communicates with the third port 31. The second port 30 and the third port 31 at a pressure of 35
And the spring 38 is connected between the second port 30 and the third port 3.
1, the outlet port 24 is connected to the inlet side of the directional control valve, and the inlet port 23 and the second port 30 are connected to a pump discharge side pipe line. Pressure introduction passage 4 connected to the outlet side of
6 is connected to the first port 29, a third pressure chamber 36 is provided.
A pressure receiving portion 33c for receiving the pressure of the pressure chamber 36 is provided. The third pressure chamber 36 divides the spool 33 with the pressure oil acting on the third pressure chamber 36 and the second port 30 and the third port 31.
In the direction of communication with the third pressure chamber 3
6 is a pressure compensating valve provided with a switching valve 50 that communicates with a first port 29 and a third port 31. Second
The idea of the invention is that the check body 28 and the pressure reducing valve 4
2, the check valve section 28 is provided with a valve 25 for communicating and shutting off the inlet port 23 and the outlet port 24, and the pressure reducing valve section 39 is provided with first, second, and third ports 29, 30,.
31 and a spool 33. The spool 33 is connected to the first port 29 through
The port 30 communicates with the third port 31, and the second port 3 communicates with the third port 31 under the pressure of the second pressure chamber 35.
0 and the third port 31 are shut off, the spring 38 pushes the spool 32 in a direction to shut off the second port 30 and the third port 31, the outlet port 24 is connected to the inlet side of the directional control valve, In a pressure compensating valve having a pump discharge side pipe line connected to the port 23 and the second port 30 and a load pressure introducing line 46 connected to the outlet side of the directional control valve connected to the first port 29, A pressure chamber 36 is provided, and the third pressure chamber 36 presses the spool 33 with pressure oil acting on the third pressure chamber 36 in a direction in which the second port 30 and the third port 31 communicate with each other. A switching valve 50 for connecting the third pressure chamber 36 to the first port 29 and the third port 31.
The pressure of the first pressure chamber 34 and the pressure of the second pressure chamber 35 are introduced into the switching valve 50, and the output pressure of the switching valve 50 is changed to the third pressure.
This is a pressure compensating valve introduced into the pressure chamber 36. In a third aspect, the valve body 20 is provided with a check valve portion 28 and a pressure reducing valve portion 42, and the check valve portion 28 is provided with a valve 25 for communicating and shutting off an inlet port 23 and an outlet port 24. Port 39 is the first, second and third port 2
9, 30, 31 and a spool 33. The spool 33 communicates with the second port 30 and the third port 31 by the pressure of the first pressure chamber 34 which communicates with the first port 29. The second port 30 and the third port 31 are shut off by the pressure of the second pressure chamber 35 communicating with the
Pushes the spool 32 in a direction to shut off the second port 30 and the third port 31, the outlet port 24 is connected to the inlet side of the directional control valve, and the inlet port 23 and the second port 30 are connected to the pump discharge side. A third pressure chamber 36 is provided in a pressure compensating valve having a pipe line connected and a load pressure introducing passage 46 connected to the outlet side of the direction control valve connected to the first port 29, and the spool 33 is always provided with a third pressure chamber 36. A pressure receiving portion 33c for receiving the pressure of the third pressure chamber 36 is provided. The third pressure chamber 36 communicates the spool 33 with pressure oil acting on the third pressure chamber 36, and connects the second port 30 and the third port 31. And a switching valve 50 that communicates the third pressure chamber 36 with the first port 29 and the third port 31. By switching the switching valve 50, the third pressure chamber 36 is switched from the load pressure introducing passage 46 to the third pressure chamber 36. Flows into one pressure chamber 34 A pressure compensating valve, wherein a pressure that has flowed into the pressure and the second pressure chamber 35 were to be introduced into the third pressure chamber 36. According to a fourth aspect of the present invention, in the first or second or third aspect, the switching valve 50 is set to the first position.
A first position A communicating the port 29 with the third pressure chamber 36;
A second position B at which the third port 31 communicates with the third pressure chamber 36
Pressure compensating valve.
【０００９】[0009]
【作 用】第１の考案によれば、第１圧力室３４の圧
力が第２圧力室３５の圧力よりも高い時にはスプール３
３が弁２５より離れて入口ポート２３の圧力と出口ポー
ト２４の圧力が等しくなる。また第１圧力室３４の圧力
と第２圧力室３５の圧力が等しくなる。第１圧力室３４
の圧力が第２圧力室３５の圧力よりも低い時にはスプー
ル３３で弁２５が遮断方向に押されて出口ポート２４の
圧力が入口ポート２３の圧力よりも第２圧力室３５と第
１圧力室３４の圧力差だけ低くなる。このようであるか
ら、この圧力補償弁を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油圧回路に設けることでシャト
ル弁を用いずに１つの油圧ポンプの吐出圧油を複数のア
クチュエータに流量分配して供給できる。また、第３圧
力室３６を第１ポート２９に連通した時と第３圧力室３
６を第３ポート３１に連通した時でスプール３３が押杆
３９で弁２５を入口ポート２３と出口ポート２４を遮断
する方向に押す力が異なるので、例えば作業内容に応じ
て圧力補償特性の設定を変更できる。第２の考案によれ
ば、第１圧力室３４の圧力が第２圧力室３５の圧力より
も高い時にはスプール３３が弁２５より離れて入口ポー
ト２３の圧力と出口ポート２４の圧力が等しくなる。ま
た第１圧力室３４の圧力と第２圧力室３５の圧力が等し
くなる。第１圧力室３４の圧力が第２圧力室３５の圧力
よりも低い時にはスプール３３で弁２５が遮断方向に押
されて出口ポート２４の圧力が入口ポート２３の圧力よ
りも第２圧力室３５と第１圧力室３４の圧力差だけ低く
なる。 このようであるから、この圧力補償弁を油圧ポ
ンプの吐出圧油を複数のアクチュエータに供給する油圧
回路に設けることでシャトル弁を用いずに１つの油圧ポ
ンプの吐出圧油を複数のアクチュエータに流量分配して
供給できる。また、第３圧力室３６を第１ポート２９に
連通して負荷圧導入路４６から流入した圧油を供給した
時と第３圧力室３６を第３ポート３１に連通して第２受
圧室３５に流入した圧油を供給した時でスプール３３が
押杆３９で弁２５を入口ポート２３と出口ポート２４を
遮断する方向に押す力が異なるので、例えば作業内容に
応じて圧力補償特性の設定を変更できる。第３の考案に
よれば、第１圧力室３４の圧力が第２圧力室３５の圧力
よりも高い時にはスプール３３が弁２５より離れて入口
ポート２３の圧力と出口ポート２４の圧力が等しくな
る。また第１圧力室３４の圧力と第２圧力室３５の圧力
が等しくなる。第１圧力室３４の圧力が第２圧力室３５
の圧力よりも低い時にはスプール３３で弁２５が遮断方
向に押されて出口ポート２４の圧力が入口ポート２３の
圧力よりも第２圧力室３５と第１圧力室３４の圧力差だ
け低くなる。このようであるから、この圧力補償弁を油
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
油圧回路に設けることでシャトル弁を用いずに１つの油
圧ポンプの吐出圧油を複数のアクチュエータに流量分配
して供給できる。また、第３圧力室３６を第１ポート２
９に連通して負荷圧導入路４６から流入した圧油を供給
した時と第３圧力室３６を第３ポート３１に連通して第
２受圧室３５に流入した圧油を供給した時でスプール３
３が押杆３９で弁２５を入口ポート２３と出口ポート２
４を遮断する方向に押す力が異なるので、例えば作業内
容に応じて圧力補償特性の設定を変更できる。According to the first invention, when the pressure in the first pressure chamber is higher than the pressure in the second pressure chamber, the spool 3 is turned off.
3 is separated from the valve 25, and the pressure at the inlet port 23 and the pressure at the outlet port 24 become equal. Further, the pressure in the first pressure chamber 34 and the pressure in the second pressure chamber 35 become equal. First pressure chamber 34
Is lower than the pressure in the second pressure chamber 35, the valve 25 is pushed in the shut-off direction by the spool 33, and the pressure in the outlet port 24 is higher than the pressure in the inlet port 23 in the second pressure chamber 35 and the first pressure chamber 34. Pressure difference. Therefore, by providing this pressure compensating valve in the hydraulic circuit for supplying the discharge pressure oil of the hydraulic pump to a plurality of actuators, the discharge pressure oil of one hydraulic pump can be supplied to the plurality of actuators without using a shuttle valve. Can be distributed and supplied. Further, when the third pressure chamber 36 is communicated with the first port 29, and when the third pressure chamber 3
6 is communicated to the third port 31, the force of the spool 33 pushing the valve 25 by the push rod 39 in the direction of blocking the inlet port 23 and the outlet port 24 is different. For example, setting of the pressure compensation characteristic according to the work content Can be changed. According to the second invention, when the pressure in the first pressure chamber 34 is higher than the pressure in the second pressure chamber 35, the spool 33 is separated from the valve 25 and the pressure at the inlet port 23 and the pressure at the outlet port 24 become equal. Further, the pressure in the first pressure chamber 34 and the pressure in the second pressure chamber 35 become equal. When the pressure in the first pressure chamber 34 is lower than the pressure in the second pressure chamber 35, the valve 25 is pushed in the shut-off direction by the spool 33, and the pressure at the outlet port 24 is higher than the pressure at the inlet port 23. The pressure decreases by the pressure difference in the first pressure chamber 34. Therefore, by providing this pressure compensating valve in the hydraulic circuit for supplying the discharge pressure oil of the hydraulic pump to a plurality of actuators, the discharge pressure oil of one hydraulic pump can be supplied to the plurality of actuators without using a shuttle valve. Can be distributed and supplied. The third pressure chamber 36 communicates with the first port 29 to supply the pressure oil flowing from the load pressure introduction passage 46, and the third pressure chamber 36 communicates with the third port 31 to connect the second pressure receiving chamber 35 with the third pressure chamber 36. When the pressure oil that has flowed into the port is supplied, the force of the spool 33 pushing the valve 25 by the push rod 39 in the direction of blocking the inlet port 23 and the outlet port 24 is different. Can be changed. According to the third invention, when the pressure in the first pressure chamber 34 is higher than the pressure in the second pressure chamber 35, the spool 33 is separated from the valve 25 and the pressure at the inlet port 23 and the pressure at the outlet port 24 become equal. Further, the pressure in the first pressure chamber 34 and the pressure in the second pressure chamber 35 become equal. The pressure in the first pressure chamber 34 is
When the pressure is lower than the pressure, the valve 25 is pushed in the shutoff direction by the spool 33, and the pressure at the outlet port 24 becomes lower than the pressure at the inlet port 23 by the pressure difference between the second pressure chamber 35 and the first pressure chamber 34. Therefore, by providing this pressure compensating valve in the hydraulic circuit for supplying the discharge pressure oil of the hydraulic pump to a plurality of actuators, the discharge pressure oil of one hydraulic pump can be supplied to the plurality of actuators without using a shuttle valve. Can be distributed and supplied. The third pressure chamber 36 is connected to the first port 2
9 and the third pressure chamber 36 communicates with the third port 31 to supply the pressure oil flowing into the second pressure receiving chamber 35. 3
3 is a push rod 39 which connects the valve 25 with the inlet port 23 and the outlet port 2
Since the pressing force in the direction in which the block 4 is interrupted is different, the setting of the pressure compensation characteristic can be changed, for example, according to the work content.
【００１０】[0010]
【実 施 例】図２に示すように、弁本体２０には一側
孔２１と他側孔２２が相対向して形成され、その一側孔
２１には入口ポート２３と出口ポート２４が形成してあ
ると共に、弁２５が嵌挿され、その弁２５はプラグ２６
に設けたストッパ杆２７で図示位置より左方に摺動しな
いように規制されてチェック弁部２８を構成している。
前記他側孔２２は小径孔２２ａと大径孔２２ｂより成
り、小径孔２２には第１・第２ポート２９，３０、大径
孔２２ｂに第３ポート３１が形成されていると共に、小
径孔２２ａと大径孔２２ｂに亘って第４ポート３２が形
成され、スプール３３は小径部３３ａと大径部３３ｂで
段部３３ｃを有し、そのスプール３３が他側孔２２に嵌
挿されて第１ポート２９に開口した第１圧力室３４と第
３ポート３１に開口した第２圧力室３５と第４ポート３
２に開口した第３圧力室３６を構成し、そのスプール３
３はプラグ３７との間に設けたばね３８で左方に押され
てスプール３３に一体的に設けた押杆３９が透孔４０よ
り突出して前記弁２５をストッパ杆２７に当接しかつ各
ポートを遮断し、第１圧力室３４内の圧力でスプール３
３が右方に摺動すると油孔４１で第２ポート３０と第３
ポート３１を連通するようになって減圧弁部４２を構成
している。[Embodiment] As shown in FIG. 2, one side hole 21 and the other side hole 22 are formed in the valve body 20 so as to face each other, and an inlet port 23 and an outlet port 24 are formed in the one side hole 21. And the valve 25 is inserted, and the valve 25 is
The check valve portion 28 is restricted by a stopper rod 27 provided at the position of the check valve portion 28 so as not to slide leftward from the position shown in the figure.
The other side hole 22 includes a small diameter hole 22a and a large diameter hole 22b. First and second ports 29 and 30 are formed in the small diameter hole 22, and a third port 31 is formed in the large diameter hole 22b. A fourth port 32 is formed over the large-diameter hole 22b and the small-diameter hole 22b. The spool 33 has a step 33c with a small-diameter portion 33a and a large-diameter portion 33b. The first pressure chamber 34 opened to the first port 29, the second pressure chamber 35 opened to the third port 31, and the fourth port 3
A third pressure chamber 36 which is open to the
3 is pushed to the left by a spring 38 provided between the plug 37 and the push rod 39 integrally provided on the spool 33 protrudes from the through hole 40 so that the valve 25 comes into contact with the stopper rod 27 and each port is connected. Shut off the spool 3 with the pressure in the first pressure chamber 34.
3 slides rightward, the second port 30 and the third port
The pressure reducing valve section 42 is configured to communicate with the port 31.
【００１１】前記入口ポート２３と第２ポート３０は油
孔ポンプ４３のポンプ吐出路４４にに接続してポンプ吐
出圧が供給され、出口ポート２４に供給路４５が接続
し、第１ポート２９が負荷圧導入路４６に接続して第１
制御圧が供給され、第３ポート３１が負荷検出路４７に
接続して第２制御圧が供給される。The inlet port 23 and the second port 30 are connected to a pump discharge path 44 of an oil hole pump 43 to be supplied with pump discharge pressure, a supply path 45 is connected to the outlet port 24, and the first port 29 is Connect to the load pressure introduction path 46 and
The control pressure is supplied, the third port 31 is connected to the load detection path 47, and the second control pressure is supplied.
【００１２】前記第１ポート２９と第４ポート３２と第
３ポート３１は切換弁５０で連通・遮断され、この切換
弁５０はバネ５１で第１位置Ａに保持されて第１ポート
２９と第４ポート３２を連通し、受圧部５２の圧油で第
２位置Ｂに切換えらられて第３ポート３１と第４ポート
３２を連通している。The first port 29, the fourth port 32, and the third port 31 are communicated and shut off by a switching valve 50. The switching valve 50 is held at a first position A by a spring 51, and is connected to the first port 29 and the first port 29. The four ports 32 communicate with each other, and are switched to the second position B by the pressure oil of the pressure receiving part 52 to communicate the third port 31 and the fourth port 32.
【００１３】次に作動を説明する。油圧ポンプ４３のポ
ンプ吐出圧が低圧で負荷圧導入路４６、負荷圧検出路４
７の圧力がゼロの時には弁２５、スプール３３が図２に
示す位置となって供給路４５の圧力で弁２５が摺動して
出口ポート２４と入口ポート２３が遮断して逆流を防止
する。油圧ポンプ４３のポンプ吐出圧が高くなると図３
のように弁２５が右方に押されて入口ポート２３と出口
ポート２５が連通して出口ポート２５より供給路４５に
供給され、ストロークエンドまで弁２５が摺動すると第
２ポート３０と第３ポート３１が連通する。図３の状態
で第１ポート２９の第１制御圧が第３ポート３１の第２
制御圧より高い場合にはスプール３３が右方に押されて
第２ポート３０が油孔４１で第３ポート３１に連通して
第３ポート３１の圧力、つまり第２制御圧は第１制御圧
に見合う圧力となり、ポンプ吐出圧と供給路４５の供給
圧は等しくなる。図３の状態で第２制御圧が第１制御圧
より高い場合にはスプール３３が左方に押されて第２ポ
ート３０と第３ポート３１が遮断し、押杆３９で弁２５
を入口ポート２３と出口ポート２４を遮断する方向に押
すので入口ポート２３と出口ポート２４の開口面積が小
さくなって供給路４５の供給圧がポンプ吐出圧より低く
なる。Next, the operation will be described. When the pump discharge pressure of the hydraulic pump 43 is low, the load pressure introduction path 46 and the load pressure detection path 4
When the pressure at 7 is zero, the valve 25 and the spool 33 are at the positions shown in FIG. 2 and the valve 25 slides by the pressure of the supply passage 45, and the outlet port 24 and the inlet port 23 are shut off to prevent backflow. When the pump discharge pressure of the hydraulic pump 43 increases, FIG.
When the valve 25 is pushed rightward, the inlet port 23 and the outlet port 25 communicate with each other and are supplied from the outlet port 25 to the supply path 45, and when the valve 25 slides to the stroke end, the second port 30 and the third port The port 31 communicates. In the state of FIG. 3, the first control pressure of the first port 29 is changed to the second control pressure of the third port 31.
When the pressure is higher than the control pressure, the spool 33 is pushed rightward, the second port 30 communicates with the third port 31 through the oil hole 41, and the pressure of the third port 31, that is, the second control pressure is equal to the first control pressure. , And the pump discharge pressure and the supply pressure of the supply path 45 become equal. When the second control pressure is higher than the first control pressure in the state shown in FIG. 3, the spool 33 is pushed to the left, the second port 30 and the third port 31 are cut off,
Is pushed in a direction to shut off the inlet port 23 and the outlet port 24, so that the opening area of the inlet port 23 and the outlet port 24 is reduced, and the supply pressure of the supply passage 45 becomes lower than the pump discharge pressure.
【００１４】このように、減圧弁部４２の第１圧力室３
４に供給される第１制御圧が第２圧力室３５に供給され
る第２制御圧よりも高い時には第２ポート３０と第３ポ
ート３１が連通してポンプ吐出圧が減圧されて第３ポー
ト３１の圧力（第２制御圧）が第１ポート２９の圧力
（第１制御圧）と同一となると共に、入口ポート２３の
圧力（ポンプ吐出圧）と出口ポート２４の圧力（供給
圧）が同一となる。例えばポンプ吐出圧１２０ｋｇ／ｃ
ｍ2 、第１制御圧１００ｋｇ／ｃｍ2 の時には第２制御
圧１００ｋｇ／ｃｍ2 、供給圧１２０ｋｇ／ｃｍ2 とな
る。同様に第１制御圧よりも第２制御圧が高い場合には
第２ポート３０と第３ポート３１が連通せずにポンプ吐
出圧が第３ポート３１に供給されないと共に、弁２５に
より入口ポート２３と出口ポート２４の開口面積が減少
して供給圧はポート吐出圧よりも第２制御圧と第１制御
圧の差圧分だけ低くなる。例えば、ポンプ吐出圧１２０
ｋｇ／ｃｍ2 、第１制御圧１０ｋｇ／ｃｍ2 、第２制御
圧１００ｋｇ／ｃｍ2 の時には供給圧３０ｋｇ／ｃｍ2
となる。As described above, the first pressure chamber 3 of the pressure reducing valve section 42
When the first control pressure supplied to the fourth pressure chamber 4 is higher than the second control pressure supplied to the second pressure chamber 35, the second port 30 and the third port 31 communicate with each other to reduce the pump discharge pressure, thereby reducing the third port pressure. The pressure at 31 (second control pressure) is the same as the pressure at first port 29 (first control pressure), and the pressure at inlet port 23 (pump discharge pressure) and the pressure at outlet port 24 (supply pressure) are the same. Becomes For example, pump discharge pressure 120kg / c
m 2 , when the first control pressure is 100 kg / cm 2 , the second control pressure is 100 kg / cm 2 and the supply pressure is 120 kg / cm 2 . Similarly, when the second control pressure is higher than the first control pressure, the second port 30 and the third port 31 do not communicate with each other, the pump discharge pressure is not supplied to the third port 31, and the valve 25 controls the inlet port 23. The supply pressure becomes lower than the port discharge pressure by the difference between the second control pressure and the first control pressure. For example, pump discharge pressure 120
kg / cm 2, the first control pressure 10 kg / cm 2, when the second control pressure 100 kg / cm 2 supply pressure 30kg / cm 2
Becomes
【００１５】以上の様であるから、１つの油圧ポンプの
吐出圧油を複数のアクチュエータに供給する油圧回路に
おいて、供給路４５を方向制御弁の入口ポートに接続
し、負荷圧導入路４６に自己のアクチュエータの負荷圧
を導入し、負荷圧検出路４７を各圧力補償弁毎に連通す
れば、従来と同様に各アクチュエータに流量分配して供
給できる。As described above, in the hydraulic circuit for supplying the discharge pressure oil of one hydraulic pump to a plurality of actuators, the supply path 45 is connected to the inlet port of the directional control valve, and If the load pressure of the actuator is introduced and the load pressure detection path 47 is connected to each pressure compensating valve, the flow can be distributed to and supplied to each actuator as in the conventional case.
【００１６】以上の説明は切換弁５０がない場合であ
り、切換弁５０を第１位置Ａとして第１ポート２９と第
４ポート３２を連通すると第３受圧室３６に作用する第
１制御圧でスプール３３が右方に押されるので、第２制
御圧が第１制御圧より高い場合に、スプール３３が左方
に押されて押杆３９で弁２５を入口ポート２３と出口ポ
ート２４を遮断する方向に押す力が前述の説明の場合よ
りも大きくなって供給圧が前述の説明の場合よりも低く
なる圧力補償特性となる。The above description is for the case where the switching valve 50 is not provided. When the switching valve 50 is set to the first position A and the first port 29 and the fourth port 32 communicate with each other, the first control pressure acting on the third pressure receiving chamber 36 is used. Since the spool 33 is pushed to the right, when the second control pressure is higher than the first control pressure, the spool 33 is pushed to the left to shut off the valve 25 with the push rod 39 between the inlet port 23 and the outlet port 24. The pressure compensating characteristic is such that the pushing force in the direction becomes larger than in the above-described case and the supply pressure becomes lower than in the above-described case.
【００１７】切換弁５０を第２位置Ｂとした時には第３
ポート３１と第４ポート３２が連通するので、前述の説
明と同じ圧力補償特性となる。When the switching valve 50 is in the second position B, the third
Since the port 31 and the fourth port 32 communicate with each other, the pressure compensation characteristics are the same as those described above.
【００１８】[0018]
【考案の効果】請求項１に係る考案によれば、第１圧力
室３４の圧力が第２圧力室３５の圧力よりも高い時には
スプール３３が弁２５より離れて入口ポート２３の圧力
と出口ポート２４の圧力が等しくなる。また第１圧力室
３４の圧力と第２圧力室３５の圧力が等しくなる。第１
圧力室３４の圧力が第２圧力室３５の圧力よりも低い時
にはスプール３３で弁２５が遮断方向に押されて出口ポ
ート２４の圧力が入口ポート２３の圧力よりも第２圧力
室３５と第１圧力室３４の圧力差だけ低くなる。このよ
うであるから、この圧力補償弁を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油圧回路に設けるこ
とでシャトル弁を用いずに１つの油圧ポンプの吐出圧油
を複数のアクチュエータに流量分配して供給できる。ま
た、第３圧力室３６を第１ポート２９に連通した時と第
３圧力室３６を第３ポート３１に連通した時でスプール
３３が押杆３９で弁２５を入口ポート２３と出口ポート
２４を遮断する方向に押す力が異なるので、例えば、作
業内容に応じて圧力補償特性の設定を変更できる。請求
項２に係る考案によれば、第１圧力室３４の圧力が第２
圧力室３５の圧力よりも高い時にはスプール３３が弁２
５より離れて入口ポート２３の圧力と出口ポート２４の
圧力が等しくなる。また第１圧力室３４の圧力と第２圧
力室３５の圧力が等しくなる。第１圧力室３４の圧力が
第２圧力室３５の圧力よりも低い時にはスプール３３で
弁２５が遮断方向に押されて出口ポート２４の圧力が入
口ポート２３の圧力よりも第２圧力室３５と第１圧力室
３４の圧力差だけ低くなる。このようであるから、この
圧力補償弁を油圧ポンプの吐出圧油を複数のアクチュエ
ータに供給する油圧回路に設けることでシャトル弁を用
いずに１つの油圧ポンプの吐出圧油を複数のアクチュエ
ータに流量分配して供給できる。また、第３圧力室３６
を第１ポート２９に連通して負荷圧導入路４６から流入
した圧油を供給した時と第３圧力室３６を第３ポート３
１に連通して第２受圧室３５に流入した圧油を供給した
時でスプール３３が押杆３９で弁２５を入口ポート２３
と出口ポート２４を遮断する方向に押す力が異なるの
で、例えば作業内容に応じて圧力補償特性の設定を変更
できる。請求項３に係る考案によれば、第１圧力室３４
の圧力が第２圧力室３５の圧力よりも高い時にはスプー
ル３３が弁２５より離れて入口ポート２３の圧力と出口
ポート２４の圧力が等しくなる。また第１圧力室３４の
圧力と第２圧力室３５の圧力が等しくなる。第１圧力室
３４の圧力が第２圧力室３５の圧力よりも低い時にはス
プール３３で弁２５が遮断方向に押されて出口ポート２
４の圧力が入口ポート２３の圧力よりも第２圧力室３５
と第１圧力室３４の圧力差だけ低くなる。このようであ
るから、この圧力補償弁を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油圧回路に設けることでシ
ャトル弁を用いずに１つの油圧ポンプの吐出圧油を複数
のアクチュエータに流量分配して供給できる。また、第
３圧力室３６を第１ポート２９に連通して負荷圧導入路
４６から流入した圧油を供給した時と第３圧力室３６を
第３ポート３１に連通して第２受圧室３５に流入した圧
油を供給した時でスプール３３が押杆３９で弁２５を入
口ポート２３と出口ポート２４を遮断する方向に押す力
が異なるので、例えば作業内容に応じて圧力補償特性の
設定を変更できる。According to the invention, when the pressure in the first pressure chamber is higher than the pressure in the second pressure chamber, the spool 33 is separated from the valve 25 and the pressure in the inlet port 23 and the outlet port. 24 are equalized. Further, the pressure in the first pressure chamber 34 and the pressure in the second pressure chamber 35 become equal. First
When the pressure in the pressure chamber 34 is lower than the pressure in the second pressure chamber 35, the valve 25 is pushed in the shut-off direction by the spool 33, and the pressure in the outlet port 24 is higher than the pressure in the inlet port 23 and the pressure in the second pressure chamber 35 and the first pressure chamber is lower. The pressure decreases by the pressure difference in the pressure chamber 34. Therefore, by providing this pressure compensating valve in the hydraulic circuit for supplying the discharge pressure oil of the hydraulic pump to a plurality of actuators, the discharge pressure oil of one hydraulic pump can be supplied to the plurality of actuators without using a shuttle valve. Can be distributed and supplied. Further, when the third pressure chamber 36 is connected to the first port 29 and when the third pressure chamber 36 is connected to the third port 31, the spool 33 pushes the valve 25 with the push rod 39 to connect the inlet port 23 and the outlet port 24. Since the pressing force in the blocking direction is different, for example, the setting of the pressure compensation characteristic can be changed according to the work content. According to the invention of claim 2, the pressure in the first pressure chamber 34 is equal to the pressure in the second pressure chamber 34.
When the pressure is higher than the pressure in the pressure chamber 35, the spool 33
5, the pressure at the inlet port 23 and the pressure at the outlet port 24 become equal. Further, the pressure in the first pressure chamber 34 and the pressure in the second pressure chamber 35 become equal. When the pressure in the first pressure chamber 34 is lower than the pressure in the second pressure chamber 35, the valve 25 is pushed in the shut-off direction by the spool 33, and the pressure at the outlet port 24 is higher than the pressure at the inlet port 23. The pressure decreases by the pressure difference in the first pressure chamber 34. Therefore, by providing this pressure compensating valve in the hydraulic circuit for supplying the discharge pressure oil of the hydraulic pump to a plurality of actuators, the discharge pressure oil of one hydraulic pump can be supplied to the plurality of actuators without using a shuttle valve. Can be distributed and supplied. In addition, the third pressure chamber 36
Is connected to the first port 29 to supply the pressure oil flowing from the load pressure introducing passage 46 and the third pressure chamber 36 is connected to the third port 3.
When the pressure oil flowing into the second pressure receiving chamber 35 is supplied to the spool 33, the spool 33 causes the push rod 39 to move the valve 25 to the inlet port 23.
And the force to push the outlet port 24 in the direction to shut off, the setting of the pressure compensation characteristic can be changed, for example, according to the work content. According to the invention of claim 3, the first pressure chamber 34.
Is higher than the pressure in the second pressure chamber 35, the spool 33 is separated from the valve 25, and the pressure in the inlet port 23 and the pressure in the outlet port 24 become equal. Further, the pressure in the first pressure chamber 34 and the pressure in the second pressure chamber 35 become equal. When the pressure in the first pressure chamber 34 is lower than the pressure in the second pressure chamber 35, the valve 25 is pushed in the shutoff direction by the spool 33 and the outlet port 2
4 is higher than the pressure of the inlet port 23 in the second pressure chamber 35.
And the pressure difference between the first pressure chamber 34 and the first pressure chamber 34. Therefore, by providing this pressure compensating valve in the hydraulic circuit that supplies the hydraulic pressure discharged from the hydraulic pump to a plurality of actuators, the hydraulic pressure discharged from one hydraulic pump can be supplied to the plurality of actuators without using a shuttle valve. Can be distributed and supplied. The third pressure chamber 36 communicates with the first port 29 to supply the pressure oil flowing from the load pressure introducing passage 46, and the third pressure chamber 36 communicates with the third port 31 to connect the second pressure receiving chamber 35 with the third pressure chamber 36. When the pressure oil that has flowed into the port is supplied, the force by which the spool 33 pushes the valve 25 by the push rod 39 in the direction of blocking the inlet port 23 and the outlet port 24 is different. Can be changed.
【図１】従来の圧力補償弁の断面図である。FIG. 1 is a sectional view of a conventional pressure compensating valve.
【図２】本考案の実施例を示す圧力補償弁の断面図であ
る。FIG. 2 is a sectional view of the pressure compensating valve according to the embodiment of the present invention.
【図３】圧力補償弁の動作説明図である。FIG. 3 is a diagram illustrating the operation of a pressure compensating valve.
２０…弁本体、２３…入口ポート、２４…出口ポート、
２５…弁、２８…チェック弁部、２９…第１ポート、３
０…第２ポート、３１…第３ポート、３３…スプール、
３４…第１圧力室、３５…第２圧力室、３６…第３圧力
室、３８…ばね、４２…減圧弁部、５０…切換弁。20: valve body, 23: inlet port, 24: outlet port,
25: valve, 28: check valve part, 29: first port, 3
0: second port, 31: third port, 33: spool,
Reference numeral 34 denotes a first pressure chamber, 35 denotes a second pressure chamber, 36 denotes a third pressure chamber, 38 denotes a spring, 42 denotes a pressure reducing valve portion, and 50 denotes a switching valve.
フロントページの続き (56)参考文献 特開 平４−244605（ＪＰ，Ａ) 特開 昭61−226495（ＪＰ，Ａ) 実開 平２−34802（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F15B 11/05 F15B 11/00 Continuation of front page (56) References JP-A-4-244605 (JP, A) JP-A-61-226495 (JP, A) JP-A-2-34802 (JP, U) (58) Fields investigated (Int .Cl. 6 , DB name) F15B 11/05 F15B 11/00
Claims (4)
部４２を設け、 前記チェック弁部２８は入口ポート２３と出口ポート２
４を連通・遮断する弁２５を設けてなり、 前記減圧弁部３９は第１・第２・第３ポート２９，３
０，３１とスプール３３を設けてなり、 前記スプール３３は第１ポート２９に連通した第１圧力
室３４の圧力で第２ポート３０と第３ポート３１を連通
し、かつ、第３ポート３１に連通した第２圧力室３５の
圧力で第２ポート３０と第３ポート３１を遮断し、 ばね３８は、第２ポート３０と第３ポート３１を遮断す
る方向にスプール３２を押し、 前記出口ポート２４は方向制御弁の入口側に接続し、 前記入口ポート２３と前記第２ポート３０にポンプ吐出
側管路を接続し、 前記方向制御弁の出口側に接続した負荷圧導入路４６を
第１ポート２９に接続してなる圧力補償弁において、 第３圧力室３６を設け、 スプール３３には常に第３圧力室３６の圧力を受ける受
圧部３３ｃを設け、 前記第３圧力室３６は、当該第３圧力室３６に作用する
圧油で前記スプール３３を、第２ポート３０と第３ポー
ト３１を連通する方向に押すべくしてなり、 当該第３圧力室３６を第１ポート２９と第３ポート３１
に連通する切換弁５０を備えたことを特徴とする圧力補
償弁。 A check valve portion and a pressure reducing valve are provided in a valve body.
The check valve section 28 is provided with an inlet port 23 and an outlet port 2.
4 is provided with a valve 25 for communicating and shutting off the pressure-reducing valve 4.
0, 31 and a spool 33, and the spool 33 is provided with a first pressure
The second port 30 communicates with the third port 31 by the pressure of the chamber 34
Of the second pressure chamber 35 communicating with the third port 31
The pressure shuts off the second port 30 and the third port 31, and the spring 38 shuts off the second port 30 and the third port 31.
The outlet port 24 is connected to the inlet side of the directional control valve, and the pump discharges to the inlet port 23 and the second port 30.
A side pressure line is connected, and a load pressure introduction line 46 connected to the outlet side of the directional control valve is connected.
In the pressure compensating valve connected to the first port 29, a third pressure chamber 36 is provided, and the spool 33 always receives the pressure of the third pressure chamber 36.
A pressure portion 33c is provided, and the third pressure chamber 36 acts on the third pressure chamber 36.
The spool 33 is pressurized with the second port 30 and the third port.
It was to press the door 31 in a direction that communicates, the third pressure chamber 36 and the first port 29 the third port 31
Pressure switch having a switching valve 50 communicating with the pressure compensation valve.
Compensation.
部４２を設け、 前記チェック弁部２８は入口ポート２３と出口ポート２
４を連通・遮断する弁２５を設けてなり、 前記減圧弁部３９は第１・第２・第３ポート２９，３
０，３１とスプール３３を設けてなり、 前記スプール３３は第１ポート２９に連通した第１圧力
室３４の圧力で第２ポート３０と第３ポート３１を連通
し、かつ、第３ポート３１に連通した第２圧力室３５の
圧力で第２ポート３０と第３ポート３１を遮断し、 ばね３８は、第２ポート３０と第３ポート３１を遮断す
る方向にスプール３２を押し、 前記出口ポート２４は方向制御弁の入口側に接続し、 前記入口ポート２３と前記第２ポート３０にポンプ吐出
側管路を接続し、 前記方向制御弁の出口側に接続した負荷圧導入路４６を
第１ポート２９に接続してなる圧力補償弁において、 第３圧力室３６を設け、 前記第３圧力室３６は、当該第３圧力室３６に作用する
圧油で前記スプール３３を、第２ポート３０と第３ポー
ト３１を連通する方向に押すべくしてなり、 前記第３圧力室３６を第１ポート２９と第３ポート３１
に連通する切換弁５０を備え、 第１圧力室３４の圧力と第２圧力室３５の圧力を切換弁
５０に導入し、この切換弁５０の出力圧を第３圧力室３
６に導入したことを特徴とする圧力補償弁。 2. A check valve section 28 and a pressure reducing valve in a valve body 20.
The check valve section 28 is provided with an inlet port 23 and an outlet port 2.
4 is provided with a valve 25 for communicating and shutting off the pressure-reducing valve 4.
0, 31 and a spool 33, and the spool 33 is provided with a first pressure
The second port 30 communicates with the third port 31 by the pressure of the chamber 34
Of the second pressure chamber 35 communicating with the third port 31
The pressure shuts off the second port 30 and the third port 31, and the spring 38 shuts off the second port 30 and the third port 31.
The outlet port 24 is connected to the inlet side of the directional control valve, and the pump discharges to the inlet port 23 and the second port 30.
A side pressure line is connected, and a load pressure introduction line 46 connected to the outlet side of the directional control valve is connected.
In the pressure compensating valve connected to the first port 29, a third pressure chamber 36 is provided, and the third pressure chamber 36 acts on the third pressure chamber 36.
The spool 33 is pressurized with the second port 30 and the third port.
It was to press the door 31 in a direction that communicates the third pressure chamber 36 and the first port 29 the third port 31
And a switching valve for communicating the pressure of the first pressure chamber 34 and the pressure of the second pressure chamber 35 with the switching valve.
The output pressure of the switching valve 50 is supplied to the third pressure chamber 3.
6. A pressure compensating valve according to claim 6.
部４２を設け、 前記チェック弁部２８は入口ポート２３と出口ポート２
４を連通・遮断する弁２５を設けてなり、 前記減圧弁部３９は第１・第２・第３ポート２９，３
０，３１とスプール３３を設けてなり、 前記スプール３３は第１ポート２９に連通した第１圧力
室３４の圧力で第２ポート３０と第３ポート３１を連通
し、かつ、第３ポート３１に連通した第２圧力室３５の
圧力で第２ポート３０と第３ポート３１を遮断し、 ばね３８は、第２ポート３０と第３ポート３１を遮断す
る方向にスプール３２を押し、 前記出口ポート２４は方向制御弁の入口側に接続し、 前記入口ポート２３と前記第２ポート３０にポンプ吐出
側管路を接続し、 前記方向制御弁の出口側に接続した負荷圧導入路４６を
第１ポート２９に接続してなる圧力補償弁において、 第３圧力室３６を設け、 スプール３３には常に第３圧力室３６の圧力を受ける受
圧部３３ｃを設け、 前記第３圧力室３６は、当該第３圧力室３６に作用する
圧油で前記スプール３３を、第２ポート３０と第３ポー
ト３１を連通する方向に押すべくしてなり、 当該第３圧力室３６を第１ポート２９と第３ポート３１
に連通する切換弁５０を備え、 当該切換弁５０を切換えることで前記負荷圧導入路４６
から第１圧力室３４に流入した圧力と前記第２圧力室３
５内に流入した圧力が第３圧力室３６に導入されるよう
にしたことを特徴とする圧力補償弁。 3. A check valve section 28 and a pressure reducing valve in the valve body 20.
The check valve section 28 is provided with an inlet port 23 and an outlet port 2.
4 is provided with a valve 25 for communicating and shutting off the pressure-reducing valve 4.
0, 31 and a spool 33, and the spool 33 is provided with a first pressure
The second port 30 communicates with the third port 31 by the pressure of the chamber 34
Of the second pressure chamber 35 communicating with the third port 31
The pressure shuts off the second port 30 and the third port 31, and the spring 38 shuts off the second port 30 and the third port 31.
The outlet port 24 is connected to the inlet side of the directional control valve, and the pump discharges to the inlet port 23 and the second port 30.
A side pressure line is connected, and a load pressure introduction line 46 connected to the outlet side of the directional control valve is connected.
In the pressure compensating valve connected to the first port 29, a third pressure chamber 36 is provided, and the spool 33 always receives the pressure of the third pressure chamber 36.
A pressure portion 33c is provided, and the third pressure chamber 36 acts on the third pressure chamber 36.
The spool 33 is pressurized with the second port 30 and the third port.
It was to press the door 31 in a direction that communicates, the third pressure chamber 36 and the first port 29 the third port 31
A switching valve 50 communicating with the load pressure introduction passage 46 by switching the switching valve 50.
And the pressure flowing into the first pressure chamber 34 from the second pressure chamber 3
5 so as to be introduced into the third pressure chamber 36.
A pressure compensating valve characterized in that:
圧力室３６に連通する第１位置Ａと、第３ポート３１を
第３圧力室３６に連通する第２位置Ｂに切換えるものと
した請求項１または２または３記載の圧力補償弁。 4. The switching valve 50 is connected to a first port 29 by a third port.
The first position A communicating with the pressure chamber 36 and the third port 31
Switching to the second position B communicating with the third pressure chamber 36;
The pressure compensating valve according to claim 1, 2, or 3.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992075260U JP2593967Y2 (en) | 1992-10-29 | 1992-10-29 | Pressure compensation valve |
| US08/411,817 US5651390A (en) | 1992-10-23 | 1993-10-22 | Pressurized fluid supply system |
| PCT/JP1993/001534 WO1994010454A1 (en) | 1992-10-23 | 1993-10-22 | Pressure oil supply system having a pressure compensating valve |
| KR1019950701574A KR950704617A (en) | 1992-10-23 | 1993-10-22 | Pressurized fluid supply system |
| EP93923052A EP0747601B1 (en) | 1992-10-23 | 1993-10-22 | Pressure oil supply system having a pressure compensating valve |
| DE69328382T DE69328382T2 (en) | 1992-10-23 | 1993-10-22 | PRESSURE OIL SUPPLY SYSTEM WITH PRESSURE COMPENSATING VALVE |
| US08/600,505 US5784885A (en) | 1992-10-23 | 1996-02-13 | Pressurized fluid supply system |
| US08/742,777 US5845678A (en) | 1992-10-23 | 1996-10-31 | Pressurized fluid supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992075260U JP2593967Y2 (en) | 1992-10-29 | 1992-10-29 | Pressure compensation valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0640409U JPH0640409U (en) | 1994-05-31 |
| JP2593967Y2 true JP2593967Y2 (en) | 1999-04-19 |
Family
ID=13571076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992075260U Expired - Lifetime JP2593967Y2 (en) | 1992-10-23 | 1992-10-29 | Pressure compensation valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2593967Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11201107A (en) * | 1998-01-12 | 1999-07-27 | Hitachi Constr Mach Co Ltd | Pressure compensation valve |
-
1992
- 1992-10-29 JP JP1992075260U patent/JP2593967Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0640409U (en) | 1994-05-31 |
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