JPS5774442A - Construction machinery such as power shovel - Google Patents
Construction machinery such as power shovelInfo
- Publication number
- JPS5774442A JPS5774442A JP55151243A JP15124380A JPS5774442A JP S5774442 A JPS5774442 A JP S5774442A JP 55151243 A JP55151243 A JP 55151243A JP 15124380 A JP15124380 A JP 15124380A JP S5774442 A JPS5774442 A JP S5774442A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- revolving
- pressure
- motor
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
PURPOSE:To enable the effective utilization of a surplus fluid at a starting time of a revolving body, by a method wherin a priority type pressure compensating valve, a feeding a pressure oil from a pump with priority to a revolving body, is mounted, and meanwhile, a load pressure signal of a revolving motor, inputted to the valve, is held below a given value. CONSTITUTION:A hydraulic circuit for a power shovel which is provided with cylinders 19, 20, and 30 for moving a bucket C to a desired position and with a revolving motor 7 for moving a revolving body D, is equipped with two variable volume type pumps 1, 1' and two switching valve blocks (a) and (b). A priority type pressure oil valve 37, which feeds pressure from the pump 1 preferently to a switching valve 4 for switching a derection of feed oil to the revolving motor 7 and feeds a surplus oil to a boom cylinder 20, is mounted at the block (a). Additionally, a pilot relief valve 69, which holds the load pressure Pr signal of the revolving motor 7, inputted to the valve 37, below a set pressure of a relief valve 68b located between revolving pipes 5 and 6 therethrough, pressure oil being fed to the motor 7 from said switching valve 4, is also provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55151243A JPS5774442A (en) | 1980-10-27 | 1980-10-27 | Construction machinery such as power shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55151243A JPS5774442A (en) | 1980-10-27 | 1980-10-27 | Construction machinery such as power shovel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5774442A true JPS5774442A (en) | 1982-05-10 |
| JPS6139450B2 JPS6139450B2 (en) | 1986-09-04 |
Family
ID=15514383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55151243A Granted JPS5774442A (en) | 1980-10-27 | 1980-10-27 | Construction machinery such as power shovel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5774442A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58213927A (en) * | 1982-06-07 | 1983-12-13 | Daikin Ind Ltd | Construction machine such as power shovel |
-
1980
- 1980-10-27 JP JP55151243A patent/JPS5774442A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58213927A (en) * | 1982-06-07 | 1983-12-13 | Daikin Ind Ltd | Construction machine such as power shovel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6139450B2 (en) | 1986-09-04 |
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