JPS57184139A - Oil-pressure circuit for civil engineering and construction machinery - Google Patents

Oil-pressure circuit for civil engineering and construction machinery

Info

Publication number
JPS57184139A
JPS57184139A JP56067221A JP6722181A JPS57184139A JP S57184139 A JPS57184139 A JP S57184139A JP 56067221 A JP56067221 A JP 56067221A JP 6722181 A JP6722181 A JP 6722181A JP S57184139 A JPS57184139 A JP S57184139A
Authority
JP
Japan
Prior art keywords
switching valve
oil
running
pressure pump
operation period
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
JP56067221A
Other languages
Japanese (ja)
Inventor
Toichi Hirata
Toshimichi Ikeda
Seiji Tamura
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 JP56067221A priority Critical patent/JPS57184139A/en
Publication of JPS57184139A publication Critical patent/JPS57184139A/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 obtain uniform lateral running without zig-zagged motion during the multi-purpose operation period while running by connecting the inlet ports of one 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 tandem with a bucket switching valve 21, the first boom switching valve 28, the first arm switching valve 25a, and left or right-side running switching valve 23. The second oil-pressure pump 24 is connected in tandem with a turning switching valve 26, the second arm switching valve 25b, the other running switching valve 27, and the second boom switching valve 29. The inlet ports of the running switching valves 27 and 23 are connected with each other. Thus, even during the combined operation period while running, the pressure oil of the first or second oil- pressure pump 20 or 24 can be uniformly supplied through a connection tube 30 to the left or right-side running motor 5 or 7, thereby preventing the occurrence of zig-zagged motion during the multi-purpose operation period.
JP56067221A 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery Pending JPS57184139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56067221A JPS57184139A (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
JP56067221A JPS57184139A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery

Publications (1)

Publication Number Publication Date
JPS57184139A true JPS57184139A (en) 1982-11-12

Family

ID=13338629

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067221A Pending JPS57184139A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery

Country Status (1)

Country Link
JP (1) JPS57184139A (en)

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

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