JPS57178043A - Hydraulic circuit of construction equipment - Google Patents
Hydraulic circuit of construction equipmentInfo
- Publication number
- JPS57178043A JPS57178043A JP6146381A JP6146381A JPS57178043A JP S57178043 A JPS57178043 A JP S57178043A JP 6146381 A JP6146381 A JP 6146381A JP 6146381 A JP6146381 A JP 6146381A JP S57178043 A JPS57178043 A JP S57178043A
- Authority
- JP
- Japan
- Prior art keywords
- pilot
- valve
- valves
- opening
- controlled
- 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
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
Abstract
PURPOSE:To eliminate the need for a bypass of a switch valve and to improve a control ability of a working cylinder, by a method wherein an opening and shutting valve for controlling a discharge amount of a pump is located between a hydraulic pump and a tank, and is controlled by a pilot valve for regulating a switch valve which drives the working cylinder. CONSTITUTION:Discharge amounts of variable capacity type hydraulic pumps 2a and 2b are controlled by pilot valves 41 and 42 for regulating pilot system direction switching valve 36 and 37 which drives a working cylinder. A pilot type opening and shutting valve 40 is situated in the middle of a line, with which discharge sides of the variable capacity type pumps 2a and 2b are coupled to a tank, it is controlled by pilot valves 41 and 42, and no bypass oil path is formed at the switching valves 36 nd 37. At a time when the pilot valves 41 and 42 are in a non-operating condition, the switch valves 36 and 37 are brought to a neutral, the opening and shutting valve is open, and the discharge amount of the hydraulic pump 2a is minimum. With the pilot valve 41 operated, the opening and shutting valve 40 is brought to a closing state, and the discharge amount of the hydraulic pump 2a varies with pilot pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6146381A JPS57178043A (en) | 1981-04-24 | 1981-04-24 | Hydraulic circuit of construction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6146381A JPS57178043A (en) | 1981-04-24 | 1981-04-24 | Hydraulic circuit of construction equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57178043A true JPS57178043A (en) | 1982-11-02 |
| JPH0257171B2 JPH0257171B2 (en) | 1990-12-04 |
Family
ID=13171749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6146381A Granted JPS57178043A (en) | 1981-04-24 | 1981-04-24 | Hydraulic circuit of construction equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57178043A (en) |
-
1981
- 1981-04-24 JP JP6146381A patent/JPS57178043A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0257171B2 (en) | 1990-12-04 |
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