JPS63151556U - - Google Patents
Info
- Publication number
- JPS63151556U JPS63151556U JP4330787U JP4330787U JPS63151556U JP S63151556 U JPS63151556 U JP S63151556U JP 4330787 U JP4330787 U JP 4330787U JP 4330787 U JP4330787 U JP 4330787U JP S63151556 U JPS63151556 U JP S63151556U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- boom
- pilot
- hydraulic
- communicates
- 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
- 238000007796 conventional method Methods 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
第１図はこの考案にかかる油圧シヨベルの油圧
回路図、第２図は従来技術の油圧回路図である。
１……ブーム第１弁、２……ブーム第２弁、３
……旋回弁、４……旋回モータ、５……ブームシ
リンダ、４３……可変絞り弁、４４……可変用シ
リンダ、４５……パイロツト切換弁、４６……電
磁比例減圧弁、４９……可変電流スイツチ。
FIG. 1 is a hydraulic circuit diagram of a hydraulic excavator according to this invention, and FIG. 2 is a hydraulic circuit diagram of a conventional technique. 1... Boom first valve, 2... Boom second valve, 3
... Swing valve, 4 ... Swing motor, 5 ... Boom cylinder, 43 ... Variable throttle valve, 44 ... Variable cylinder, 45 ... Pilot switching valve, 46 ... Solenoid proportional pressure reducing valve, 49 ... Variable current switch.
Claims (1)
タ制御用切換弁を２個のグループＡ，Ｂに分け、
そのグループＡ内に旋回弁とブーム第２弁とを並
列に設け、かつ、グループＢ内にブーム第１弁を
設け、また、グループＡ、グループＢのそれぞれ
圧油供給源として第１ポンプ、第２ポンプを配置
した油圧回路において、旋回モータ用圧油供給油
路に可変絞り弁を設け、その可変絞り弁の可変用
シリンダとパイロツトポンプとを連通する油路に
パイロツト切換弁および電磁化例減圧弁を直列に
連結し、上記パイロツト切換弁のパイロツト圧受
圧部と、ブーム用リモコン弁のブーム上昇用パイ
ロツト弁とを連通することを特徴とする油圧シヨ
ベルの油圧回路。 The switching valves for controlling various hydraulic actuators installed on the hydraulic excavator are divided into two groups A and B.
A swing valve and a second boom valve are provided in parallel in group A, and a first boom valve is provided in group B, and a first pump and a second boom valve are provided as pressure oil supply sources for groups A and B, respectively. In a hydraulic circuit in which two pumps are arranged, a variable throttle valve is provided in the pressure oil supply oil path for the swing motor, and a pilot switching valve and an electromagnetic pressure reducing valve are installed in the oil path that communicates the variable cylinder of the variable throttle valve with the pilot pump. A hydraulic circuit for a hydraulic excavator, characterized in that valves are connected in series, and a pilot pressure receiving part of the pilot switching valve communicates with a boom lifting pilot valve of a boom remote control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4330787U JPS63151556U (en) | 1987-03-23 | 1987-03-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4330787U JPS63151556U (en) | 1987-03-23 | 1987-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63151556U true JPS63151556U (en) | 1988-10-05 |
Family
ID=30860041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4330787U Pending JPS63151556U (en) | 1987-03-23 | 1987-03-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63151556U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62284835A (en) * | 1986-06-03 | 1987-12-10 | Sumitomo Heavy Ind Ltd | Hydraulic circuit for hydraulic shovel |
-
1987
- 1987-03-23 JP JP4330787U patent/JPS63151556U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62284835A (en) * | 1986-06-03 | 1987-12-10 | Sumitomo Heavy Ind Ltd | Hydraulic circuit for hydraulic shovel |