JPH0257170B2 - - Google Patents

Info

Publication number
JPH0257170B2
JPH0257170B2 JP2367581A JP2367581A JPH0257170B2 JP H0257170 B2 JPH0257170 B2 JP H0257170B2 JP 2367581 A JP2367581 A JP 2367581A JP 2367581 A JP2367581 A JP 2367581A JP H0257170 B2 JPH0257170 B2 JP H0257170B2
Authority
JP
Japan
Prior art keywords
circuit
valve
hydraulic
pressure
pilot
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.)
Expired
Application number
JP2367581A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57140442A (en
Inventor
Takeshi Yamaguchi
Sotaro Tanaka
Takashi Yagyu
Yasuo Sakaki
Eiki Izumi
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 JP2367581A priority Critical patent/JPS57140442A/ja
Publication of JPS57140442A publication Critical patent/JPS57140442A/ja
Publication of JPH0257170B2 publication Critical patent/JPH0257170B2/ja
Granted 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
    • E02F9/2296—Systems with a variable displacement pump
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
JP2367581A 1981-02-21 1981-02-21 Oil-pressure circuit for civil and construction machinery Granted JPS57140442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2367581A JPS57140442A (en) 1981-02-21 1981-02-21 Oil-pressure circuit for civil and construction machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2367581A JPS57140442A (en) 1981-02-21 1981-02-21 Oil-pressure circuit for civil and construction machinery

Publications (2)

Publication Number Publication Date
JPS57140442A JPS57140442A (en) 1982-08-31
JPH0257170B2 true JPH0257170B2 (enrdf_load_stackoverflow) 1990-12-04

Family

ID=12117052

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2367581A Granted JPS57140442A (en) 1981-02-21 1981-02-21 Oil-pressure circuit for civil and construction machinery

Country Status (1)

Country Link
JP (1) JPS57140442A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03115070U (enrdf_load_stackoverflow) * 1990-03-06 1991-11-27

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03115070U (enrdf_load_stackoverflow) * 1990-03-06 1991-11-27

Also Published As

Publication number Publication date
JPS57140442A (en) 1982-08-31

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