JPH01118201U - - Google Patents
Info
- Publication number
- JPH01118201U JPH01118201U JP1422688U JP1422688U JPH01118201U JP H01118201 U JPH01118201 U JP H01118201U JP 1422688 U JP1422688 U JP 1422688U JP 1422688 U JP1422688 U JP 1422688U JP H01118201 U JPH01118201 U JP H01118201U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- circuit
- self
- pump
- 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.)
- Granted
Links
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
第１図は本考案の第１の実施例を示す油圧回路
図、第２図は同じく第２の実施例を示す油圧回路
図、第３図は従来技術を示す油圧回路図である。
１……主配管（ポンプ回路）、２……油圧ポン
プ、２Ａ……容量可変機構、４……サーボピスト
ン（油圧サーボ機構）、５……シリンダ装置（ア
クチユエータ）、８……タンク、９，１０……給
排配管、１７……手動切換弁（容量制御弁）、２
１……自己圧配管（自己圧回路）、２２……減圧
弁、２３，２３′……方向切換弁、２４，２５…
…ドレン配管（ドレン回路）、２６……絞り（低
圧保持弁）、３１……油圧モータ（アクチユエー
タ）、３３……低圧リリーフ弁（低圧保持弁）。
FIG. 1 is a hydraulic circuit diagram showing a first embodiment of the present invention, FIG. 2 is a hydraulic circuit diagram also showing a second embodiment, and FIG. 3 is a hydraulic circuit diagram showing a conventional technique. 1... Main piping (pump circuit), 2... Hydraulic pump, 2A... Variable capacity mechanism, 4... Servo piston (hydraulic servo mechanism), 5... Cylinder device (actuator), 8... Tank, 9, 10... Supply/discharge piping, 17... Manual switching valve (capacity control valve), 2
1... Self-pressure piping (self-pressure circuit), 22... Pressure reducing valve, 23, 23'... Directional switching valve, 24, 25...
...Drain piping (drain circuit), 26... Throttle (low pressure holding valve), 31... Hydraulic motor (actuator), 33... Low pressure relief valve (low pressure holding valve).
Claims (1)
て作動せしめられる容量可変機構を備えた油圧ポ
ンプと、ポンプ回路を介して該油圧ポンプからの
圧油が供給されると共にドレン回路を介してタン
クと接続されるアクチユエータと、該アクチユエ
ータを作動すべく、ポンプ回路とドレン回路の切
換を行なう方向切換弁と、前記ポンプ回路内の圧
油を自己圧として前記油圧サーボ機構に供給する
自己圧回路と、該自己圧回路の途中に設けられた
容量制御弁とからなるアクチユエータ駆動回路に
おいて、前記自己圧回路には自己圧を所定圧に減
圧する減圧弁を設け、前記ドレン回路には前記方
向切換弁が中立位置にあるときにも該ドレン回路
内に該減圧弁の設定圧よりも低圧な圧力状態を保
持せしめる低圧保持弁を設ける構成としたことを
特徴とするアクチユエータ駆動回路。 In order to make the capacity variable, there is a hydraulic pump equipped with a variable capacity mechanism operated by a hydraulic servo mechanism, and pressure oil is supplied from the hydraulic pump through a pump circuit and connected to a tank through a drain circuit. a connected actuator, a directional switching valve that switches between a pump circuit and a drain circuit in order to operate the actuator, and a self-pressure circuit that supplies pressure oil in the pump circuit as self-pressure to the hydraulic servo mechanism; In an actuator drive circuit comprising a capacity control valve provided in the middle of the self-pressure circuit, the self-pressure circuit is provided with a pressure reducing valve that reduces the self-pressure to a predetermined pressure, and the drain circuit is provided with the directional switching valve. An actuator drive circuit characterized in that a low pressure holding valve is provided in the drain circuit to maintain a pressure state lower than the set pressure of the pressure reducing valve even when the actuator drive circuit is in a neutral position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988014226U JPH074321Y2 (en) | 1988-02-05 | 1988-02-05 | Actuator drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988014226U JPH074321Y2 (en) | 1988-02-05 | 1988-02-05 | Actuator drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01118201U true JPH01118201U (en) | 1989-08-10 |
| JPH074321Y2 JPH074321Y2 (en) | 1995-02-01 |
Family
ID=31225238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988014226U Expired - Lifetime JPH074321Y2 (en) | 1988-02-05 | 1988-02-05 | Actuator drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH074321Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005248474A (en) * | 2004-03-02 | 2005-09-15 | Hokoku Kogyo Co Ltd | Actuator operating circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4957275A (en) * | 1972-07-13 | 1974-06-04 | ||
| JPS61103584U (en) * | 1984-12-12 | 1986-07-01 |
-
1988
- 1988-02-05 JP JP1988014226U patent/JPH074321Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4957275A (en) * | 1972-07-13 | 1974-06-04 | ||
| JPS61103584U (en) * | 1984-12-12 | 1986-07-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH074321Y2 (en) | 1995-02-01 |