JPS57116840A - Operating device for civil engineering work and construction machinery - Google Patents

Operating device for civil engineering work and construction machinery

Info

Publication number
JPS57116840A
JPS57116840A JP77081A JP77081A JPS57116840A JP S57116840 A JPS57116840 A JP S57116840A JP 77081 A JP77081 A JP 77081A JP 77081 A JP77081 A JP 77081A JP S57116840 A JPS57116840 A JP S57116840A
Authority
JP
Japan
Prior art keywords
valve
switch valve
pressure
switch
tank
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
JP77081A
Other languages
Japanese (ja)
Other versions
JPS6362608B2 (en
Inventor
Toichi Hirata
Seiji Tamura
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 JP77081A priority Critical patent/JPS57116840A/en
Publication of JPS57116840A publication Critical patent/JPS57116840A/en
Publication of JPS6362608B2 publication Critical patent/JPS6362608B2/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)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To join pressure oils in a convergent circuit even when operating force is small by using a system in which a pressure generator is provided between the tank port of one direction switch valve and a tank, and by its generated pressure, the servo valve of the other direction switch valve is operated. CONSTITUTION:In case where pressure oils from plural direction-switch valves 7 and 8 are joined in one actuator 6, a pressure generator consisting of relief valve 17 is provided between the tank port 18 of one-direction switch valve 7 and a tank 5, the direction switch valve 7 is switched through a switch rod 9, and the pressure oil of an oil-pressure pump 1 is supplied through the switch valve 7 to the actuator 6. In the return pipeline, by pressure produced in the relief valve 17, a servo valve 19 operating the other converging switch valve 8 is actuated and the switch valve 8 is switched. Thus, the switching of the other direction- switch valve 8 can also be concurrently performed only by the switch operating performance of one-way switch valve 7.
JP77081A 1981-01-08 1981-01-08 Operating device for civil engineering work and construction machinery Granted JPS57116840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP77081A JPS57116840A (en) 1981-01-08 1981-01-08 Operating device for civil engineering work and construction machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP77081A JPS57116840A (en) 1981-01-08 1981-01-08 Operating device for civil engineering work and construction machinery

Publications (2)

Publication Number Publication Date
JPS57116840A true JPS57116840A (en) 1982-07-21
JPS6362608B2 JPS6362608B2 (en) 1988-12-02

Family

ID=11482923

Family Applications (1)

Application Number Title Priority Date Filing Date
JP77081A Granted JPS57116840A (en) 1981-01-08 1981-01-08 Operating device for civil engineering work and construction machinery

Country Status (1)

Country Link
JP (1) JPS57116840A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS612568U (en) * 1984-06-12 1986-01-09 ハンド−ザ−工業株式会社 Hydraulic pump merging device for earthmoving vehicles
JPS612567U (en) * 1984-06-07 1986-01-09 ハンド−ザ−工業株式会社 Hydraulic pump merging device for earthmoving vehicles
JP2016125559A (en) * 2014-12-26 2016-07-11 株式会社クボタ Hydraulic system for work machine and work machine with this hydraulic system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54148004U (en) * 1978-04-05 1979-10-15
JPS5513254U (en) * 1978-07-10 1980-01-28

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5383318A (en) * 1976-12-29 1978-07-22 Seikoo Sangiyou Kk Veranda attaching structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54148004U (en) * 1978-04-05 1979-10-15
JPS5513254U (en) * 1978-07-10 1980-01-28

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS612567U (en) * 1984-06-07 1986-01-09 ハンド−ザ−工業株式会社 Hydraulic pump merging device for earthmoving vehicles
JPS612568U (en) * 1984-06-12 1986-01-09 ハンド−ザ−工業株式会社 Hydraulic pump merging device for earthmoving vehicles
JP2016125559A (en) * 2014-12-26 2016-07-11 株式会社クボタ Hydraulic system for work machine and work machine with this hydraulic system

Also Published As

Publication number Publication date
JPS6362608B2 (en) 1988-12-02

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