JPS57184138A - Oil-pressure circuit for civil engineering and construction machinery - Google Patents

Oil-pressure circuit for civil engineering and construction machinery

Info

Publication number
JPS57184138A
JPS57184138A JP56067220A JP6722081A JPS57184138A JP S57184138 A JPS57184138 A JP S57184138A JP 56067220 A JP56067220 A JP 56067220A JP 6722081 A JP6722081 A JP 6722081A JP S57184138 A JPS57184138 A JP S57184138A
Authority
JP
Japan
Prior art keywords
switching valve
running
oil
pressure pump
pressure
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
JP56067220A
Other languages
Japanese (ja)
Inventor
Seiji Tamura
Toshimichi Ikeda
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 JP56067220A priority Critical patent/JPS57184138A/en
Priority to DE3216249A priority patent/DE3216249C2/en
Priority to KR8201934A priority patent/KR870000506B1/en
Publication of JPS57184138A publication Critical patent/JPS57184138A/en
Priority to US06/737,884 priority patent/US4614475A/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)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To obtain laterally uniform running forces and prevent zigzagged 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 parallel with a bucket switching valve 21, the first boom switching valve 28, and one running switching valve 23. The second oil-pressure pump 24 is connected in tandem with a turning switching valve 26, the second boom switching valve 29, an arm switching valve 25, and the other running switching valve 27 in order. The inlet ports of the running switching valves 23 and 27 are connected by a connection tube 30. Thus, even during the multi-purpose operation period while running, the pressure oil in the first and second oil-pressure pumps 20 and 24 can be supplied through the connection tube 30 uniformly to the right or left running motor 5 or 7, thereby preventing the occurrence of zig-zagged motions.
JP56067220A 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery Pending JPS57184138A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP56067220A JPS57184138A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery
DE3216249A DE3216249C2 (en) 1981-05-02 1982-04-30 Hydraulic system for civil engineering machines
KR8201934A KR870000506B1 (en) 1981-05-02 1982-04-30 Hydraulic circuit system for civil engineering and architectural machinery
US06/737,884 US4614475A (en) 1981-05-02 1985-05-28 Hydraulic circuit system for civil engineering and architectural machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56067220A JPS57184138A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery

Publications (1)

Publication Number Publication Date
JPS57184138A true JPS57184138A (en) 1982-11-12

Family

ID=13338601

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067220A Pending JPS57184138A (en) 1981-05-02 1981-05-02 Oil-pressure circuit for civil engineering and construction machinery

Country Status (1)

Country Link
JP (1) JPS57184138A (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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