JPS57240A - Controller for oil pressure of construction equipment - Google Patents
Controller for oil pressure of construction equipmentInfo
- Publication number
- JPS57240A JPS57240A JP7149080A JP7149080A JPS57240A JP S57240 A JPS57240 A JP S57240A JP 7149080 A JP7149080 A JP 7149080A JP 7149080 A JP7149080 A JP 7149080A JP S57240 A JPS57240 A JP S57240A
- Authority
- JP
- Japan
- Prior art keywords
- pump
- port
- discharge
- pilot
- neutral position
- 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
-
- 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)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE:To greatly reduce the loss of horsepower and improve the cost of fuel by providing a pilot port and a check valve to each operating valve and controlling the position of a pump at its neutral position by fetching the signals of operating position and neutral position. CONSTITUTION:When all spools 5b-7b of operation valve groups are restored to neutral position due to the temporary stoppage of operation, etc., between the pilot ports 52 and 56-72 and 76 and also between the tank ports 54 and 55-74 and 75 of operating valves 5-7 are broken. Thus, the pressure of the pressure chamber of a PC pilot switch valve becomes equal to that of a spring chamber, the charge pressure of the pump port is supplied through the PC port to the pressure chamber of a pump neutral controller, and thereby piston is pushed toward a discharge- reducing direction and the discharge of each variable discharge pump is maintained at minimum value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7149080A JPS57240A (en) | 1980-05-30 | 1980-05-30 | Controller for oil pressure of construction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7149080A JPS57240A (en) | 1980-05-30 | 1980-05-30 | Controller for oil pressure of construction equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57240A true JPS57240A (en) | 1982-01-05 |
| JPH0255568B2 JPH0255568B2 (en) | 1990-11-27 |
Family
ID=13462146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7149080A Granted JPS57240A (en) | 1980-05-30 | 1980-05-30 | Controller for oil pressure of construction equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57240A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0429851Y2 (en) * | 1987-11-19 | 1992-07-20 | ||
| EP1977819A2 (en) | 1996-12-06 | 2008-10-08 | Basf Catalysts Llc | Catalytic metal plate |
-
1980
- 1980-05-30 JP JP7149080A patent/JPS57240A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0429851Y2 (en) * | 1987-11-19 | 1992-07-20 | ||
| EP1977819A2 (en) | 1996-12-06 | 2008-10-08 | Basf Catalysts Llc | Catalytic metal plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0255568B2 (en) | 1990-11-27 |
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