JPH0271101U - - Google Patents
Info
- Publication number
- JPH0271101U JPH0271101U JP14901088U JP14901088U JPH0271101U JP H0271101 U JPH0271101 U JP H0271101U JP 14901088 U JP14901088 U JP 14901088U JP 14901088 U JP14901088 U JP 14901088U JP H0271101 U JPH0271101 U JP H0271101U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- directional
- pilot
- control valve
- pressure oil
- 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 3
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の実施例に係る油圧シヨベルの
ブームシリンダの方向切換弁駆動油圧回路の回路
図、第２図は第１図に示す圧力補償付流量制御弁
の断面図、第３図および第４図はそれぞれ油圧シ
ヨベルの概略構成の側面図および平面図、第５図
は第３図に示すブームシリンダの方向切換弁の駆
動油圧回路の回路図、第６図ａ，ｂ，ｃは第５図
に示す油圧回路の動作を説明するタイムチヤート
、第７図は他の方向切換弁の駆動油圧回路の回路
図、第８図は第７図に示す圧力補償付流量制御弁
の断面図、第９図ａ，ｂ，ｃは第７図に示す油圧
回路の動作を説明するタイムチヤートである。
１１……ブームシリンダ、１６……方向切換弁
、２３……操作レバー、２４……パイロツト弁、
３５ａ′，３５ｂ′……圧力補償付流量制御弁、
３９ａ，５０ａ……スプール、５１ａ，５１ｂ…
…パイロツト室、５４……ソレノイド弁。
Fig. 1 is a circuit diagram of a hydraulic circuit for driving a directional valve of a boom cylinder of a hydraulic excavator according to an embodiment of the present invention, Fig. 2 is a sectional view of the flow control valve with pressure compensation shown in Fig. 1, and Figs. Figure 4 is a side view and a plan view of the schematic configuration of the hydraulic excavator, Figure 5 is a circuit diagram of the drive hydraulic circuit for the directional control valve of the boom cylinder shown in Figure 3, and Figures 6a, b, and c are the FIG. 5 is a time chart explaining the operation of the hydraulic circuit shown in FIG. 7, FIG. 7 is a circuit diagram of a drive hydraulic circuit for another directional control valve, FIG. 8 is a cross-sectional view of the flow control valve with pressure compensation shown in FIG. 7, 9a, b, and c are time charts for explaining the operation of the hydraulic circuit shown in FIG. 7. FIG. 11...Boom cylinder, 16...Directional switching valve, 23...Operation lever, 24...Pilot valve,
35a', 35b'...flow control valve with pressure compensation,
39a, 50a...spool, 51a, 51b...
...Pilot chamber, 54...Solenoid valve.
Claims (1)
切換弁と、この方向切換弁を操作するパイロツト
弁と、このパイロツト弁と前記方向切換弁とを接
続するパイロツト管路と、このパイロツト管路に
介在せしめられ前記パイロツト弁から前記方向切
換弁へは自由に圧油を通過せしめ前記方向切換弁
から前記パイロツト弁へは圧油の流れを制限する
流量制御弁とを備えた方向切換弁駆動油圧回路に
おいて、前記流量制御弁のスプールを両方向の圧
油の流れを自由とする位置に任意に移動させる手
段を設けたことを特徴とする方向切換弁駆動油圧
回路。 (2) 請求項(1)において、前記手段は、前記流量
制御弁において前記スプールの一端と対向して設
けられたポート、およびこのポートに対してパイ
ロツト圧油を任意に供給、排除する切換弁とで構
成されていることを特徴とする方向切換弁駆動油
圧回路。[Claims for Utility Model Registration] (1) A directional control valve that controls the drive of a hydraulic actuator, a pilot valve that operates the directional control valve, and a pilot pipe that connects the pilot valve and the directional control valve. , a flow control valve interposed in the pilot conduit to allow pressure oil to freely pass from the pilot valve to the directional switching valve and to restrict the flow of pressure oil from the directional switching valve to the pilot valve. A directional valve driving hydraulic circuit, characterized in that the directional valve driving hydraulic circuit is provided with means for arbitrarily moving the spool of the flow rate control valve to a position where pressure oil can freely flow in both directions. (2) In claim (1), the means includes a port provided in the flow rate control valve opposite to one end of the spool, and a switching valve that arbitrarily supplies or removes pilot pressure oil to or from this port. A directional valve drive hydraulic circuit comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14901088U JPH0271101U (en) | 1988-11-17 | 1988-11-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14901088U JPH0271101U (en) | 1988-11-17 | 1988-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0271101U true JPH0271101U (en) | 1990-05-30 |
Family
ID=31420844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14901088U Pending JPH0271101U (en) | 1988-11-17 | 1988-11-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0271101U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007278380A (en) * | 2006-04-05 | 2007-10-25 | Toshiba Mach Co Ltd | Load sensing hydraulic controller |
-
1988
- 1988-11-17 JP JP14901088U patent/JPH0271101U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007278380A (en) * | 2006-04-05 | 2007-10-25 | Toshiba Mach Co Ltd | Load sensing hydraulic controller |
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