FR2449751B1 - - Google Patents

Info

Publication number: FR2449751B1
Authority: FR; France
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.): Expired

Application number

FR8004111A

Other languages

Other versions

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Hitachi Construction Machinery Co Ltd

Original Assignee

Hitachi Construction Machinery Co Ltd

Priority date (The priority date 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 date listed.)

1979-02-26

Filing date

1980-02-25

Publication date

1985-04-12

1979-02-26 Priority claimed from JP2077679A external-priority patent/JPS55115606A/en

1979-06-27 Priority claimed from JP8021279A external-priority patent/JPS566901A/en

1979-10-19 Priority claimed from JP54134259A external-priority patent/JPS595166B2/en

1980-02-25 Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd

1980-09-19 Publication of FR2449751A1 publication Critical patent/FR2449751A1/en

1985-04-12 Application granted granted Critical

1985-04-12 Publication of FR2449751B1 publication Critical patent/FR2449751B1/fr

Status Granted legal-status Critical Current

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
- 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
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
- E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
- 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
- E02F9/2292—Systems with two or more pumps

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)
Fluid-Pressure Circuits (AREA)

FR8004111A 1979-02-26 1980-02-25 ACTUATION SYSTEM FOR CONSTRUCTION MACHINES AND METHOD FOR CONTROLLING HYDRAULIC CIRCUITS OF SUCH A SYSTEM Granted FR2449751A1 (en)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
JP2077679A JPS55115606A (en)	1979-02-26	1979-02-26	Closed hydraulic circuit for controlling operation of pump
JP8021279A JPS566901A (en)	1979-06-27	1979-06-27	Hydraulic circuit for construction equipment
JP54134259A JPS595166B2 (en)	1979-10-19	1979-10-19	Control method of pump control hydraulic circuit

Publications (2)

Publication Number	Publication Date
FR2449751A1 FR2449751A1 (en)	1980-09-19
FR2449751B1 true FR2449751B1 (en)	1985-04-12

Family

ID=27283160

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR8004111A Granted FR2449751A1 (en)	1979-02-26	1980-02-25	ACTUATION SYSTEM FOR CONSTRUCTION MACHINES AND METHOD FOR CONTROLLING HYDRAULIC CIRCUITS OF SUCH A SYSTEM

Country Status (4)

Country	Link
DE (1)	DE3007011C2 (en)
FR (1)	FR2449751A1 (en)
GB (1)	GB2045360B (en)
SE (1)	SE448762B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS57197336A (en) *	1981-05-29	1982-12-03	Komatsu Ltd	Oil-pressure circuit for turning excavator
JPS5817202A (en) *	1981-07-24	1983-02-01	Hitachi Constr Mach Co Ltd	Control unit for hydraulic circuit
JPS5857504A (en) *	1981-10-02	1983-04-05	Hitachi Constr Mach Co Ltd	Controller for hydraulic circuit
US4537029A (en) *	1982-09-23	1985-08-27	Vickers, Incorporated	Power transmission
US5029067A (en) *	1987-01-30	1991-07-02	Kabushiki Kaisha Komatsu Seisakusho	Operation control device
DE3704452A1 (en) *	1987-02-10	1988-08-18	Mannesmann Ag	Hydraulic system for an excavator
GB2250108B (en) *	1990-10-31	1995-02-08	Samsung Heavy Ind	Control system for automatically controlling actuators of an excavator
JP5572586B2 (en) *	2011-05-19	2014-08-13	日立建機株式会社	Hydraulic drive device for work machine
JP5973979B2 (en) *	2013-11-21	2016-08-23	日立建機株式会社	Drive device for work machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2631530A1 (en) *	1976-07-14	1978-01-19	Weserhuette Ag Eisenwerk	Control system for hydraulically driven excavator - has minimal number of operating levers for interlocked individual circuits

1980
- 1980-02-25 GB GB8006247A patent/GB2045360B/en not_active Expired
- 1980-02-25 DE DE19803007011 patent/DE3007011C2/en not_active Expired
- 1980-02-25 FR FR8004111A patent/FR2449751A1/en active Granted
- 1980-02-25 SE SE8001459A patent/SE448762B/en not_active IP Right Cessation

Also Published As

Publication number	Publication date
DE3007011C2 (en)	1987-01-02
SE448762B (en)	1987-03-16
FR2449751A1 (en)	1980-09-19
DE3007011A1 (en)	1981-01-15
GB2045360B (en)	1982-12-08
GB2045360A (en)	1980-10-29
SE8001459L (en)	1980-08-27

Publication	Publication Date	Title
FR2448693B1 (en)	1984-04-20
FR2446947B1 (en)	1984-08-31
FR2450251B1 (en)	1983-02-18
BR8006808A (en)	1981-04-28
FR2447379B1 (en)	1983-08-19
FR2449751B1 (en)	1985-04-12
FR2445780B3 (en)	1981-10-16
FR2448178B3 (en)	1981-07-10
FR2448426B1 (en)	1983-12-16
FR2448881B3 (en)	1982-09-03
FR2448651B1 (en)	1984-03-16
FR2449608B3 (en)	1981-06-26
FR2447763B3 (en)	1981-07-03
FR2447765B1 (en)	1981-08-14
FR2448816B1 (en)	1984-01-13
FR2446598B1 (en)	1985-05-03
FR2450140B3 (en)	1981-12-24
AU79826S (en)	1981-02-10
AU78391S (en)	1980-11-26
AU77763S (en)	1980-09-15
AU77669S (en)	1980-09-29
AU80228S (en)	1980-09-09
AU79950S (en)	1981-01-30
AU79918S (en)	1981-02-09
AU78271S (en)	1980-02-12

Legal Events

Date	Code	Title	Description
1995-12-29	ST	Notification of lapse