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JPS57174541A - Oil-pressure working machine - Google Patents

Oil-pressure working machine

Info

Publication number
JPS57174541A
JPS57174541A JP56058287A JP5828781A JPS57174541A JP S57174541 A JPS57174541 A JP S57174541A JP 56058287 A JP56058287 A JP 56058287A JP 5828781 A JP5828781 A JP 5828781A JP S57174541 A JPS57174541 A JP S57174541A
Authority
JP
Japan
Prior art keywords
oil
speed
operation portion
operated
manual operation
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
Application number
JP56058287A
Other languages
Japanese (ja)
Inventor
Genroku Sugiyama
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.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP56058287A priority Critical patent/JPS57174541A/en
Publication of JPS57174541A publication Critical patent/JPS57174541A/en
Pending legal-status Critical Current

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
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

PURPOSE:To relief the need for manual operation as well as adjust the driving speed of a working machine by using a system in which one of two direction switching valves through which pressure oil is supplied from two oil-pressure motors to an actuator or discharged or vice or versa is operated by a pedal and the other is operated manually. CONSTITUTION:In a mechanism by which to speed up an arm cylinder in an oil-pressure shovel, when the arm cylinder 5 is driven, any one of a manual operation portion 6 and a pedal operation portion 13 is operated in case where no great driving force is needed and the speed-up of driving speed is not required, and on the contrary, in case where great driving force is needed and also speed-up of the driving speed is needed, both the manual operation portion 6 and the pedal operation portion 13 are concurrently operated by a manner that the direction switching valve 3a contained in the first control mechanism 2a is connected to the manual operation portion 6, the direction switching valve 4a contained in the second control mechanism 2b is connected to the foot-stepping pedal operation 13, and the oils of two oil-pressure motors 1a and 1b are joined.
JP56058287A 1981-04-17 1981-04-17 Oil-pressure working machine Pending JPS57174541A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56058287A JPS57174541A (en) 1981-04-17 1981-04-17 Oil-pressure working machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56058287A JPS57174541A (en) 1981-04-17 1981-04-17 Oil-pressure working machine

Publications (1)

Publication Number Publication Date
JPS57174541A true JPS57174541A (en) 1982-10-27

Family

ID=13079978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56058287A Pending JPS57174541A (en) 1981-04-17 1981-04-17 Oil-pressure working machine

Country Status (1)

Country Link
JP (1) JPS57174541A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010040890A1 (en) * 2008-10-10 2010-04-15 Norrhydro Oy Digital hydraulic system
US10704569B2 (en) 2015-10-19 2020-07-07 Norrhydro Oy Hydraulic system and method for controlling a hydraulic system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010040890A1 (en) * 2008-10-10 2010-04-15 Norrhydro Oy Digital hydraulic system
AU2009300985B2 (en) * 2008-10-10 2014-05-08 Norrhydro Oy Digital hydraulic system
US9021798B2 (en) 2008-10-10 2015-05-05 Norrhydro Oy Digital hydraulic system
US10704569B2 (en) 2015-10-19 2020-07-07 Norrhydro Oy Hydraulic system and method for controlling a hydraulic system

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