JPH0478304U - - Google Patents
Info
- Publication number
- JPH0478304U JPH0478304U JP12165890U JP12165890U JPH0478304U JP H0478304 U JPH0478304 U JP H0478304U JP 12165890 U JP12165890 U JP 12165890U JP 12165890 U JP12165890 U JP 12165890U JP H0478304 U JPH0478304 U JP H0478304U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control device
- hydraulic control
- relief
- differential pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案に係る油圧制御装置の回路図、
第２図は従来例の回路図である。
１ａ，１ｂ……パイロツトバルブ、２ａ，２ｂ
……操作レバー、３ａ，３ｂ……方向切換弁、４
ａ，４ｂ……圧力補償弁、５……ロードセンシン
グレギユレータ、６ａ，６ｂ……アクチユエータ
、ａ１，ａ２，ｂ１，ｂ２……分枝パイロツトラ
イン、Ａ……チエツク弁群、Ｂ……リリーフバル
ブ、Ｃ……ピストン、Ｐ……主ポンプ。
FIG. 1 is a circuit diagram of a hydraulic control device according to the present invention,
FIG. 2 is a circuit diagram of a conventional example. 1a, 1b...Pilot valve, 2a, 2b
...Operation lever, 3a, 3b...Directional switching valve, 4
a, 4b...pressure compensation valve, 5...load sensing regulator, 6a , 6b...actuator, a1, a2 , b1 , b2 ...branch pilot line, A...check valve group, B...Relief valve, C...Piston, P...Main pump.
Claims (1)
方向切換弁３ａ，３ｂ〜３ｎとを結ぶ各パイロツ
ト２次圧ラインに、それぞれ分枝パイロツト管路
ａ１，ａ２，ｂ１，ｂ２，〜ｎ１，ｎ２を設け、
該分枝パイロツト管路を、チヤツク弁群Ａを介し
てリリーフ弁Ｂに接続すると共に、該リリーフ弁
のリリーフ圧は主ポンプＰの吐出圧と最大負荷圧
との差圧により作動するピストンＣによつて設定
されるようにしたことを特徴とする油圧制御装置
。 ２ 主ポンプＰの吐出圧と最大負荷圧との差圧に
より作動するピストンＣは、前記差圧が所定値以
下となつたとき、該差圧が小さくなるに従いリリ
ーフ弁Ｂのリリーフ圧を低下させる方向に作動す
ることを特徴とする請求項１）記載の油圧制御装
置。[Claims for Utility Model Registration] 1. Branch pilot pipes a 1 , a 2 , b 1 , b 2 , ~ n 1 , n 2 are provided,
The branch pilot pipe is connected to a relief valve B via a chuck valve group A, and the relief pressure of the relief valve is applied to a piston C operated by the differential pressure between the discharge pressure of the main pump P and the maximum load pressure. A hydraulic control device characterized in that the settings are made according to 2 The piston C, which is operated by the differential pressure between the discharge pressure of the main pump P and the maximum load pressure, reduces the relief pressure of the relief valve B as the differential pressure becomes smaller, when the differential pressure becomes less than a predetermined value. 2. The hydraulic control device according to claim 1, wherein the hydraulic control device operates in a direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12165890U JPH0478304U (en) | 1990-11-20 | 1990-11-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12165890U JPH0478304U (en) | 1990-11-20 | 1990-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0478304U true JPH0478304U (en) | 1992-07-08 |
Family
ID=31869506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12165890U Pending JPH0478304U (en) | 1990-11-20 | 1990-11-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0478304U (en) |
-
1990
- 1990-11-20 JP JP12165890U patent/JPH0478304U/ja active Pending
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