JPS57140445A - Oil-pressure circuit for oil-pressure type excavator - Google Patents
Oil-pressure circuit for oil-pressure type excavatorInfo
- Publication number
- JPS57140445A JPS57140445A JP2367881A JP2367881A JPS57140445A JP S57140445 A JPS57140445 A JP S57140445A JP 2367881 A JP2367881 A JP 2367881A JP 2367881 A JP2367881 A JP 2367881A JP S57140445 A JPS57140445 A JP S57140445A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- pressure
- boom
- side oil
- pressure circuit
- 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
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
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
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)
Abstract
PURPOSE:To obtain an oil-pressure circuit for oil-pressure type excavators, which is capable of recovering the potential energy of boom, by using a back-hoe and a loading shovel. CONSTITUTION:Valve means 22 and 24 by which the bottom side oil chamber of a boom cylinder 7 is shortcircuited with a rod side oil chamber with respect to oil pressure by an input of working pressure when the pressure of the bottom side oil changer of the boom cylinder 7 is higher than that of the rod side oil chamber, and a control means by which working pressures are given to the valve means 22 and 24 through interlocking with the lowering action of the boom by a manual direction switching valve 13 are provided. By such an oil- pressure circuit system, the potential energy of the boom can be utilized effectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2367881A JPS57140445A (en) | 1981-02-21 | 1981-02-21 | Oil-pressure circuit for oil-pressure type excavator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2367881A JPS57140445A (en) | 1981-02-21 | 1981-02-21 | Oil-pressure circuit for oil-pressure type excavator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57140445A true JPS57140445A (en) | 1982-08-31 |
Family
ID=12117124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2367881A Pending JPS57140445A (en) | 1981-02-21 | 1981-02-21 | Oil-pressure circuit for oil-pressure type excavator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57140445A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59233030A (en) * | 1983-06-17 | 1984-12-27 | Sumitomo Heavy Ind Ltd | Cylinder regeneration circuit for oil-pressure shovel |
JPS60112935A (en) * | 1983-11-24 | 1985-06-19 | Hitachi Constr Mach Co Ltd | Hydraulic circuit of construction equipment |
JPH0250493U (en) * | 1988-09-30 | 1990-04-09 | ||
JP2001208008A (en) * | 1999-12-15 | 2001-08-03 | Caterpillar Inc | Hydraulic circuit having pressure equalization during regeneration |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53113104A (en) * | 1977-03-14 | 1978-10-03 | Hitachi Construction Machinery | Boom turning hydraulic circuit |
JPS5549112B2 (en) * | 1977-04-28 | 1980-12-10 |
-
1981
- 1981-02-21 JP JP2367881A patent/JPS57140445A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53113104A (en) * | 1977-03-14 | 1978-10-03 | Hitachi Construction Machinery | Boom turning hydraulic circuit |
JPS5549112B2 (en) * | 1977-04-28 | 1980-12-10 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59233030A (en) * | 1983-06-17 | 1984-12-27 | Sumitomo Heavy Ind Ltd | Cylinder regeneration circuit for oil-pressure shovel |
JPH0526901B2 (en) * | 1983-06-17 | 1993-04-19 | Sumitomo Heavy Industries | |
JPS60112935A (en) * | 1983-11-24 | 1985-06-19 | Hitachi Constr Mach Co Ltd | Hydraulic circuit of construction equipment |
JPH0250493U (en) * | 1988-09-30 | 1990-04-09 | ||
JP2001208008A (en) * | 1999-12-15 | 2001-08-03 | Caterpillar Inc | Hydraulic circuit having pressure equalization during regeneration |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5697023A (en) | Semiautomatic oil pressure excavator | |
EP0436740A4 (en) | Linear excavation control apparatus in hydraulic excavator | |
GB1514654A (en) | Apparatus for controlling work element operating pressures in a fluid system | |
FR2420069A1 (en) | FLUID-CONTROLLED CHANGEOVER VALVE | |
JPS57140445A (en) | Oil-pressure circuit for oil-pressure type excavator | |
ES482508A1 (en) | High lift hydraulic system for an excavator | |
GB1001637A (en) | Improvements relating to shovelling machine | |
JPS57140444A (en) | Oil-pressure circuit for oil-pressure type excavator | |
JPS56150227A (en) | Controller for excavation of trench by oil-pressure excavator | |
JPS55108538A (en) | Hydraulic circuit for hydraulic shovel | |
GB1108203A (en) | Variable pitch excavator dipper mounting | |
JPS57140443A (en) | Oil-pressure circuit for oil-pressure type excavator | |
GB941902A (en) | Improvements relating to shovel loaders | |
JPS57205638A (en) | Oil-pressure circuit for oil-pressure shovel | |
GB1416212A (en) | Machines having a component movable in extend and retract directions by at least one hydraulic cylinder | |
JPS5590703A (en) | Oil hydraulic circuit of oil hydraulic shovel | |
JPS57140436A (en) | Arm for oil-pressure type shovel-based excavator | |
GB1291311A (en) | Machine having a fluid operated boom or other movable member | |
JPS55119838A (en) | Hydraulic control circuit in loader | |
JPS5519302A (en) | Hydraulic pressure line in hydraulic shovel | |
JPS57123331A (en) | Oil pressure circuit for oil-pressure excavator | |
JPS57127028A (en) | Hydraulic circuit for loading shovel | |
JPS646420A (en) | Overload preventer for hydraulic shovel | |
JPS57127026A (en) | Hydraulic circuit for hydraulic shovel | |
JPS57123330A (en) | Oil-pressure circuit for oil-pressure excavator |