JPS57140434A - Oil-pressure circuit for oil-pressure shovel - Google Patents

Oil-pressure circuit for oil-pressure shovel

Info

Publication number
JPS57140434A
JPS57140434A JP2478681A JP2478681A JPS57140434A JP S57140434 A JPS57140434 A JP S57140434A JP 2478681 A JP2478681 A JP 2478681A JP 2478681 A JP2478681 A JP 2478681A JP S57140434 A JPS57140434 A JP S57140434A
Authority
JP
Japan
Prior art keywords
oil
pressure
turning
control valve
shovel
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
JP2478681A
Other languages
Japanese (ja)
Other versions
JPS6330452B2 (en
Inventor
Hideaki Yoshimatsu
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP2478681A priority Critical patent/JPS57140434A/en
Publication of JPS57140434A publication Critical patent/JPS57140434A/en
Publication of JPS6330452B2 publication Critical patent/JPS6330452B2/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

Abstract

PURPOSE:To obtain a better turning capacibility of an oil-pressure shovel by improving the energy efficiency during he acceleration period of turning and also providing an independent turning circuit. CONSTITUTION:A presssure compensatory flow rate control valve 31 having a turning preference is provided between th input side port of a turning direction control valve 16 and an oil-pressure pump P. By the pressure compensatory flow rate control valve 31, the pathway for bleeded-off oil is connected to the input side port of the direction control valve of an actuator, e.g., arm cylinder C2, boom cylinder C1, etc., and also the set pressure of the control valve 31 is made lower than those of the main relief valves 21 and 22 of the oil-pressure pump P and those of overload relief valves 41 and 42 provided in the turning circuit.
JP2478681A 1981-02-20 1981-02-20 Oil-pressure circuit for oil-pressure shovel Granted JPS57140434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2478681A JPS57140434A (en) 1981-02-20 1981-02-20 Oil-pressure circuit for oil-pressure shovel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2478681A JPS57140434A (en) 1981-02-20 1981-02-20 Oil-pressure circuit for oil-pressure shovel

Publications (2)

Publication Number Publication Date
JPS57140434A true JPS57140434A (en) 1982-08-31
JPS6330452B2 JPS6330452B2 (en) 1988-06-17

Family

ID=12147862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2478681A Granted JPS57140434A (en) 1981-02-20 1981-02-20 Oil-pressure circuit for oil-pressure shovel

Country Status (1)

Country Link
JP (1) JPS57140434A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6334304A (en) * 1986-07-29 1988-02-15 Toshiba Mach Co Ltd Hydraulic circuit for hydraulic shovel
JP2007071237A (en) * 2005-09-05 2007-03-22 Shibusho Kensetsu:Kk Hydraulic circuit, electric control circuit and hydraulic motor disconnecting device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3681833B2 (en) * 1996-09-19 2005-08-10 ヤンマー株式会社 Hydraulic circuit of excavating and turning work machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5774441A (en) * 1980-10-27 1982-05-10 Daikin Ind Ltd Construction machinery such as power shovel

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5774441A (en) * 1980-10-27 1982-05-10 Daikin Ind Ltd Construction machinery such as power shovel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6334304A (en) * 1986-07-29 1988-02-15 Toshiba Mach Co Ltd Hydraulic circuit for hydraulic shovel
JP2007071237A (en) * 2005-09-05 2007-03-22 Shibusho Kensetsu:Kk Hydraulic circuit, electric control circuit and hydraulic motor disconnecting device

Also Published As

Publication number Publication date
JPS6330452B2 (en) 1988-06-17

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