JPS6252095B2 - - Google Patents

Info

Publication number
JPS6252095B2
JPS6252095B2 JP15809279A JP15809279A JPS6252095B2 JP S6252095 B2 JPS6252095 B2 JP S6252095B2 JP 15809279 A JP15809279 A JP 15809279A JP 15809279 A JP15809279 A JP 15809279A JP S6252095 B2 JPS6252095 B2 JP S6252095B2
Authority
JP
Japan
Prior art keywords
arm
boom
valve
control valve
side chamber
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
JP15809279A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5681741A (en
Inventor
Kozo Ono
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 JP15809279A priority Critical patent/JPS5681741A/ja
Publication of JPS5681741A publication Critical patent/JPS5681741A/ja
Publication of JPS6252095B2 publication Critical patent/JPS6252095B2/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
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
JP15809279A 1979-12-07 1979-12-07 Locus controlling device of working tool such as oil pressure shovel Granted JPS5681741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15809279A JPS5681741A (en) 1979-12-07 1979-12-07 Locus controlling device of working tool such as oil pressure shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15809279A JPS5681741A (en) 1979-12-07 1979-12-07 Locus controlling device of working tool such as oil pressure shovel

Publications (2)

Publication Number Publication Date
JPS5681741A JPS5681741A (en) 1981-07-04
JPS6252095B2 true JPS6252095B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1987-11-04

Family

ID=15664115

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15809279A Granted JPS5681741A (en) 1979-12-07 1979-12-07 Locus controlling device of working tool such as oil pressure shovel

Country Status (1)

Country Link
JP (1) JPS5681741A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2817574B1 (fr) * 2000-12-04 2003-10-10 Faucheux Ind Soc Dispositif chargeur frontal pour engin porteur
US8340875B1 (en) * 2011-06-16 2012-12-25 Caterpillar Inc. Lift system implementing velocity-based feedforward control
JP7237792B2 (ja) * 2019-10-03 2023-03-13 日立建機株式会社 建設機械

Also Published As

Publication number Publication date
JPS5681741A (en) 1981-07-04

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