JPS57140445A - Oil-pressure circuit for oil-pressure type excavator - Google Patents

Oil-pressure circuit for oil-pressure type excavator

Info

Publication number
JPS57140445A
JPS57140445A JP2367881A JP2367881A JPS57140445A JP S57140445 A JPS57140445 A JP S57140445A JP 2367881 A JP2367881 A JP 2367881A JP 2367881 A JP2367881 A JP 2367881A JP S57140445 A JPS57140445 A JP S57140445A
Authority
JP
Japan
Prior art keywords
oil
pressure
boom
side oil
pressure circuit
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
JP2367881A
Other languages
Japanese (ja)
Inventor
Takeshi Yamaguchi
Sotaro Tanaka
Yasuo Sakaki
Takashi Yagyu
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 JP2367881A priority Critical patent/JPS57140445A/en
Publication of JPS57140445A publication Critical patent/JPS57140445A/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
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels

Abstract

PURPOSE:To obtain an oil-pressure circuit for oil-pressure type excavators, which is capable of recovering the potential energy of boom, by using a back-hoe and a loading shovel. CONSTITUTION:Valve means 22 and 24 by which the bottom side oil chamber of a boom cylinder 7 is shortcircuited with a rod side oil chamber with respect to oil pressure by an input of working pressure when the pressure of the bottom side oil changer of the boom cylinder 7 is higher than that of the rod side oil chamber, and a control means by which working pressures are given to the valve means 22 and 24 through interlocking with the lowering action of the boom by a manual direction switching valve 13 are provided. By such an oil- pressure circuit system, the potential energy of the boom can be utilized effectively.
JP2367881A 1981-02-21 1981-02-21 Oil-pressure circuit for oil-pressure type excavator Pending JPS57140445A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2367881A JPS57140445A (en) 1981-02-21 1981-02-21 Oil-pressure circuit for oil-pressure type excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2367881A JPS57140445A (en) 1981-02-21 1981-02-21 Oil-pressure circuit for oil-pressure type excavator

Publications (1)

Publication Number Publication Date
JPS57140445A true JPS57140445A (en) 1982-08-31

Family

ID=12117124

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2367881A Pending JPS57140445A (en) 1981-02-21 1981-02-21 Oil-pressure circuit for oil-pressure type excavator

Country Status (1)

Country Link
JP (1) JPS57140445A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59233030A (en) * 1983-06-17 1984-12-27 Sumitomo Heavy Ind Ltd Cylinder regeneration circuit for oil-pressure shovel
JPS60112935A (en) * 1983-11-24 1985-06-19 Hitachi Constr Mach Co Ltd Hydraulic circuit of construction equipment
JPH0250493U (en) * 1988-09-30 1990-04-09
JP2001208008A (en) * 1999-12-15 2001-08-03 Caterpillar Inc Hydraulic circuit having pressure equalization during regeneration

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53113104A (en) * 1977-03-14 1978-10-03 Hitachi Construction Machinery Boom turning hydraulic circuit
JPS5549112B2 (en) * 1977-04-28 1980-12-10

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53113104A (en) * 1977-03-14 1978-10-03 Hitachi Construction Machinery Boom turning hydraulic circuit
JPS5549112B2 (en) * 1977-04-28 1980-12-10

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59233030A (en) * 1983-06-17 1984-12-27 Sumitomo Heavy Ind Ltd Cylinder regeneration circuit for oil-pressure shovel
JPH0526901B2 (en) * 1983-06-17 1993-04-19 Sumitomo Heavy Industries
JPS60112935A (en) * 1983-11-24 1985-06-19 Hitachi Constr Mach Co Ltd Hydraulic circuit of construction equipment
JPH0250493U (en) * 1988-09-30 1990-04-09
JP2001208008A (en) * 1999-12-15 2001-08-03 Caterpillar Inc Hydraulic circuit having pressure equalization during regeneration

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