JPS57197333A - Oil-pressure circuit for oil-pressure shovel - Google Patents

Oil-pressure circuit for oil-pressure shovel

Info

Publication number
JPS57197333A
JPS57197333A JP7935081A JP7935081A JPS57197333A JP S57197333 A JPS57197333 A JP S57197333A JP 7935081 A JP7935081 A JP 7935081A JP 7935081 A JP7935081 A JP 7935081A JP S57197333 A JPS57197333 A JP S57197333A
Authority
JP
Japan
Prior art keywords
oil
pressure
handed
motor
supplied
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.)
Granted
Application number
JP7935081A
Other languages
Japanese (ja)
Other versions
JPH0128174B2 (en
Inventor
Toichi Hirata
Toshimichi Ikeda
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 JP7935081A priority Critical patent/JPS57197333A/en
Publication of JPS57197333A publication Critical patent/JPS57197333A/en
Publication of JPH0128174B2 publication Critical patent/JPH0128174B2/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
    • 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

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)

Abstract

PURPOSE:To prevent the meandering running of an oil-pressure shovel by using a system in which left and right-handed running motors are connected in parallel with independent oil-pressure pumps, the discharge pipeline of each oil-pressure pump is connected to the other through an electromagnetic communication valve, and the valve is opened or closed by a switching valve. CONSTITUTION:Since an electromagnetic communication valve 23 is closed when operating left and right-handed running switch valves 14 and 18, the pressure oils of oil- pressure pumps 12 and 13 are supplied to each of left and right-handed running motors 6 and 7, whereupon the speeds of the left and right-handed motors 6 and 7 become values corresponding to the operation amounts of the valves 14 and 18. Under the condition, when operating a turning switch valve 16, for example, the communication valve 23 is opened. Therefore, part of the pressure oil of the oil-pressure pump 12 is supplied to the turning motor 8 and part of the pressure oil of the pump 13 is supplied to the left-handed motor 6 through the communication valve 23 even when the amount of pressure oil to be supplied to the left-handed motor 6 is reduced. By this, the reduction rate of the speed of the left-handed motor 6 is lessened, the amount of pressure oil to be supplied from the pump 13 to the right-handed motor 7 is reduced, and the speed of the right-haded motor 7 is also reduced.
JP7935081A 1981-05-27 1981-05-27 Oil-pressure circuit for oil-pressure shovel Granted JPS57197333A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7935081A JPS57197333A (en) 1981-05-27 1981-05-27 Oil-pressure circuit for oil-pressure shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7935081A JPS57197333A (en) 1981-05-27 1981-05-27 Oil-pressure circuit for oil-pressure shovel

Publications (2)

Publication Number Publication Date
JPS57197333A true JPS57197333A (en) 1982-12-03
JPH0128174B2 JPH0128174B2 (en) 1989-06-01

Family

ID=13687447

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7935081A Granted JPS57197333A (en) 1981-05-27 1981-05-27 Oil-pressure circuit for oil-pressure shovel

Country Status (1)

Country Link
JP (1) JPS57197333A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165428A (en) * 1985-01-17 1986-07-26 Yutani Juko Kk Hydraulic circuit for construction machine
JPS61165429A (en) * 1985-01-17 1986-07-26 Yutani Juko Kk Hydraulic circuit for construction machine
JPS6272356U (en) * 1985-10-16 1987-05-09
JPS62117923A (en) * 1985-11-15 1987-05-29 Kobe Steel Ltd Control circuit for traveling of construction machine
JPH03144024A (en) * 1989-10-31 1991-06-19 Komatsu Ltd Hydraulic circuit of hydraulic drilling machine
EP2431538A1 (en) * 2010-09-21 2012-03-21 Kubota Corporation Hydraulic system for working machine
JP2014522465A (en) * 2011-06-09 2014-09-04 ボルボ コンストラクション イクイップメント アーベー Hydraulic system for construction machinery

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5152190U (en) * 1974-10-19 1976-04-20
JPS5323916U (en) * 1976-08-06 1978-02-28
JPS5437036U (en) * 1977-08-19 1979-03-10
JPS5437038U (en) * 1977-08-18 1979-03-10
JPS5477501U (en) * 1977-11-11 1979-06-01
JPS54106602U (en) * 1978-01-12 1979-07-27

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5152190U (en) * 1974-10-19 1976-04-20
JPS5323916U (en) * 1976-08-06 1978-02-28
JPS5437038U (en) * 1977-08-18 1979-03-10
JPS5437036U (en) * 1977-08-19 1979-03-10
JPS5477501U (en) * 1977-11-11 1979-06-01
JPS54106602U (en) * 1978-01-12 1979-07-27

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165428A (en) * 1985-01-17 1986-07-26 Yutani Juko Kk Hydraulic circuit for construction machine
JPS61165429A (en) * 1985-01-17 1986-07-26 Yutani Juko Kk Hydraulic circuit for construction machine
JPH0372769B2 (en) * 1985-01-17 1991-11-19 Yutani Juko Kk
JPH0577813B2 (en) * 1985-01-17 1993-10-27 Yutani Juko Kk
JPS6272356U (en) * 1985-10-16 1987-05-09
JPH0352275Y2 (en) * 1985-10-16 1991-11-12
JPS62117923A (en) * 1985-11-15 1987-05-29 Kobe Steel Ltd Control circuit for traveling of construction machine
JPH03144024A (en) * 1989-10-31 1991-06-19 Komatsu Ltd Hydraulic circuit of hydraulic drilling machine
EP2431538A1 (en) * 2010-09-21 2012-03-21 Kubota Corporation Hydraulic system for working machine
US8701399B2 (en) 2010-09-21 2014-04-22 Kubota Corporation Hydraulic system for working machine
JP2014522465A (en) * 2011-06-09 2014-09-04 ボルボ コンストラクション イクイップメント アーベー Hydraulic system for construction machinery

Also Published As

Publication number Publication date
JPH0128174B2 (en) 1989-06-01

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