JPS57184137A - Oil-pressure circuit for oil-pressure working machine - Google Patents

Oil-pressure circuit for oil-pressure working machine

Info

Publication number
JPS57184137A
JPS57184137A JP56066902A JP6690281A JPS57184137A JP S57184137 A JPS57184137 A JP S57184137A JP 56066902 A JP56066902 A JP 56066902A JP 6690281 A JP6690281 A JP 6690281A JP S57184137 A JPS57184137 A JP S57184137A
Authority
JP
Japan
Prior art keywords
valve
switching valve
oil
running
pump
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
JP56066902A
Other languages
Japanese (ja)
Inventor
Kimio Katsuki
Kazuhiko Otsubo
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 JP56066902A priority Critical patent/JPS57184137A/en
Publication of JPS57184137A publication Critical patent/JPS57184137A/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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance

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)

Abstract

PURPOSE:To increase the speed of multi-purpose operation of an oil-pressure working machine while independently making its turning operation by using a system in which a third pump is connected to other switching valve while performing the non-turning and multi-purpose operation period while running and also the oil pressure of the third pump is joined with the oil on the discharge side of the first and second pumps during the single-purpose operation period. CONSTITUTION:To the first pump 1, the first switching valve group (right-side running valve 14, a boom valve 15, an arm valve 16, and bucket valve 17) 6 is connected parallel from the most upstream of the center by-pass 7. To the second pump 2, the second switching vavle group (a left-side running valve 18, a boom valve 19, and an arm valve 20) 9 is connected in parallel to the center by-pass. In the third switching valve group 12, a turning switching valve 21 is provided to the third pump 3, the first and second switching valve groups 6 and 9 are connected to the upstream of the switching valve competing with each running switching valve, and the most downstream of the third switching valve group is connected always to the tank and the downstream of the running switching valve during the multi-purpose operation period while running and also connected to the switching valve connecting to the discharge side of the first and second pumps during the single purpose operation period.
JP56066902A 1981-05-06 1981-05-06 Oil-pressure circuit for oil-pressure working machine Pending JPS57184137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56066902A JPS57184137A (en) 1981-05-06 1981-05-06 Oil-pressure circuit for oil-pressure working machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56066902A JPS57184137A (en) 1981-05-06 1981-05-06 Oil-pressure circuit for oil-pressure working machine

Publications (1)

Publication Number Publication Date
JPS57184137A true JPS57184137A (en) 1982-11-12

Family

ID=13329331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56066902A Pending JPS57184137A (en) 1981-05-06 1981-05-06 Oil-pressure circuit for oil-pressure working machine

Country Status (1)

Country Link
JP (1) JPS57184137A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59106705A (en) * 1982-12-13 1984-06-20 Sumitomo Heavy Ind Ltd Hydraulic circuit for hydraulic shovel and the like
JPS59106704A (en) * 1982-12-09 1984-06-20 Yanmar Diesel Engine Co Ltd Traveling driving hydraulic circuit
JPS62258026A (en) * 1986-04-30 1987-11-10 Kobe Steel Ltd Oil-pressure circuit for oil-pressure shovel
JPH01223226A (en) * 1988-03-01 1989-09-06 Kubota Ltd Hydraulic circuit for back hoe working vehicle
JPH04118428A (en) * 1990-09-06 1992-04-20 Kubota Corp Hydraulic circuit structure of working vehicle
EP0846809A3 (en) * 1996-12-04 1998-09-30 Clark Equipment Company Mini-excavator with improved valve arrangement
JP2008224034A (en) * 2007-03-12 2008-09-25 Volvo Construction Equipment Ab Hydraulic circuit for construction machine
EP2157245A2 (en) * 2008-08-21 2010-02-24 Volvo Construction Equipment Holding Sweden AB Hydraulic system for construction equipment
KR101260072B1 (en) 2005-12-28 2013-05-02 두산인프라코어 주식회사 Hydraulic control system for combined operation of en excavator
CN104204548A (en) * 2012-03-23 2014-12-10 萱场工业株式会社 Travel-control valve

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519302A (en) * 1978-07-10 1980-02-12 Hitachi Constr Mach Co Ltd Hydraulic pressure line in hydraulic shovel
JPS55103104A (en) * 1979-02-03 1980-08-07 Kobe Steel Ltd Hydraulic circuit for hydraulic vehicle
JPS5614607A (en) * 1979-07-13 1981-02-12 Hitachi Constr Mach Co Ltd Hydraulic circuit for hydraulic shovel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519302A (en) * 1978-07-10 1980-02-12 Hitachi Constr Mach Co Ltd Hydraulic pressure line in hydraulic shovel
JPS55103104A (en) * 1979-02-03 1980-08-07 Kobe Steel Ltd Hydraulic circuit for hydraulic vehicle
JPS5614607A (en) * 1979-07-13 1981-02-12 Hitachi Constr Mach Co Ltd Hydraulic circuit for hydraulic shovel

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59106704A (en) * 1982-12-09 1984-06-20 Yanmar Diesel Engine Co Ltd Traveling driving hydraulic circuit
JPH0124922B2 (en) * 1982-12-09 1989-05-15 Yanmar Diesel Engine Co
JPS59106705A (en) * 1982-12-13 1984-06-20 Sumitomo Heavy Ind Ltd Hydraulic circuit for hydraulic shovel and the like
JPS62258026A (en) * 1986-04-30 1987-11-10 Kobe Steel Ltd Oil-pressure circuit for oil-pressure shovel
JPH01223226A (en) * 1988-03-01 1989-09-06 Kubota Ltd Hydraulic circuit for back hoe working vehicle
JPH04118428A (en) * 1990-09-06 1992-04-20 Kubota Corp Hydraulic circuit structure of working vehicle
US6018895A (en) * 1996-03-28 2000-02-01 Clark Equipment Company Valve stack in a mini-excavator directing fluid under pressure from multiple pumps to actuable elements
EP0846809A3 (en) * 1996-12-04 1998-09-30 Clark Equipment Company Mini-excavator with improved valve arrangement
KR101260072B1 (en) 2005-12-28 2013-05-02 두산인프라코어 주식회사 Hydraulic control system for combined operation of en excavator
JP2008224034A (en) * 2007-03-12 2008-09-25 Volvo Construction Equipment Ab Hydraulic circuit for construction machine
EP2157245A2 (en) * 2008-08-21 2010-02-24 Volvo Construction Equipment Holding Sweden AB Hydraulic system for construction equipment
EP2157245A3 (en) * 2008-08-21 2013-06-19 Volvo Construction Equipment Holding Sweden AB Hydraulic system for construction equipment
CN104204548A (en) * 2012-03-23 2014-12-10 萱场工业株式会社 Travel-control valve
CN104204548B (en) * 2012-03-23 2016-01-20 萱场工业株式会社 Travel control valve

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