JPS57184140A - Oil-pressure circuit for civil engineering and construction machinery - Google Patents

Oil-pressure circuit for civil engineering and construction machinery

Info

Publication number
JPS57184140A
JPS57184140A JP56067222A JP6722281A JPS57184140A JP S57184140 A JPS57184140 A JP S57184140A JP 56067222 A JP56067222 A JP 56067222A JP 6722281 A JP6722281 A JP 6722281A JP S57184140 A JPS57184140 A JP S57184140A
Authority
JP
Japan
Prior art keywords
switching valve
running
oil
pressure pump
civil engineering
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
JP56067222A
Other languages
Japanese (ja)
Inventor
Toshimichi Ikeda
Seiji Tamura
Toichi Hirata
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 JP56067222A priority Critical patent/JPS57184140A/en
Publication of JPS57184140A publication Critical patent/JPS57184140A/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
    • E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission

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 equalize the left and right-side running forces without any zig- zagged motion during the multi-purpose operation period while running by connecting the inlet ports of the left or right-side running switching valve of the first oil-pressure pump and also of the other running switching valve of the second oil-pressure pump. CONSTITUTION:The first oil-pressure pump 20 is connected in parallel with a bucket switching valve 21, a turning switching valve 26, and a boom switching valve 22 in order, and in tandem with a left or right-side running switching valve 23 downstream of the boom switching valve 22. The second oil-pressure pump 24 is connected in tandem with an arm switching valve 25 and the other running switching valve 27 in order. The inlet ports of the running switching valves 27 and 23 are connected by a connection tube 30. Thus, lateral running forces can be equalized without causing any zig-zagged motion during the multi- purpose operation period while running.
JP56067222A 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery Pending JPS57184140A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56067222A JPS57184140A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56067222A JPS57184140A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery

Publications (1)

Publication Number Publication Date
JPS57184140A true JPS57184140A (en) 1982-11-12

Family

ID=13338660

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067222A Pending JPS57184140A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery

Country Status (1)

Country Link
JP (1) JPS57184140A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018080768A (en) * 2016-11-17 2018-05-24 川崎重工業株式会社 Electric hydraulic system including hydraulic actuator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5227128A (en) * 1975-08-25 1977-03-01 Caterpillar Tractor Co Synchronous hydraulic driving system for vehicle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5227128A (en) * 1975-08-25 1977-03-01 Caterpillar Tractor Co Synchronous hydraulic driving system for vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018080768A (en) * 2016-11-17 2018-05-24 川崎重工業株式会社 Electric hydraulic system including hydraulic actuator

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