JPS5519302A - Hydraulic pressure line in hydraulic shovel - Google Patents

Hydraulic pressure line in hydraulic shovel

Info

Publication number
JPS5519302A
JPS5519302A JP8293378A JP8293378A JPS5519302A JP S5519302 A JPS5519302 A JP S5519302A JP 8293378 A JP8293378 A JP 8293378A JP 8293378 A JP8293378 A JP 8293378A JP S5519302 A JPS5519302 A JP S5519302A
Authority
JP
Japan
Prior art keywords
hydraulic
throttle
cylinder
arm
pump
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
JP8293378A
Other languages
Japanese (ja)
Other versions
JPS5919214B2 (en
Inventor
Toshimichi Ikeda
Seiji Tamura
Kuniaki Yoshida
Yutaka Murata
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 JP53082933A priority Critical patent/JPS5919214B2/en
Publication of JPS5519302A publication Critical patent/JPS5519302A/en
Publication of JPS5919214B2 publication Critical patent/JPS5919214B2/en
Expired 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:A means is provided to obtain a required revolving power greater than a specified value regardless of load on the arm, when rotating hydraulic motor and arm hydraulic cylinder are simutatneously operated. CONSTITUTION:When the load of the hydraulic arm cylinder 40 is less than that of the rotating hydraulic motor 50, oil pressure of pump 2 actuates the cylinder 40 to generated differential pressure at both sides of throttle E and switch valve 32a works. And when the cylinder 40 extends to cause the arm excavation, the switch valve 32a moves to the right, actuating throttle F. Then, the pump 32a increases its discharge pressure to the value corresponding to the resistance of the throttle F. Therefore, if the resistance of the throttle F is set to the value exceeding the motor 50 starting load, the pressure oil of the pump 3a is fed to the motor 50 to actuate it.
JP53082933A 1978-07-10 1978-07-10 Hydraulic excavator hydraulic circuit Expired JPS5919214B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53082933A JPS5919214B2 (en) 1978-07-10 1978-07-10 Hydraulic excavator hydraulic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53082933A JPS5919214B2 (en) 1978-07-10 1978-07-10 Hydraulic excavator hydraulic circuit

Publications (2)

Publication Number Publication Date
JPS5519302A true JPS5519302A (en) 1980-02-12
JPS5919214B2 JPS5919214B2 (en) 1984-05-04

Family

ID=13788023

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53082933A Expired JPS5919214B2 (en) 1978-07-10 1978-07-10 Hydraulic excavator hydraulic circuit

Country Status (1)

Country Link
JP (1) JPS5919214B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57184137A (en) * 1981-05-06 1982-11-12 Hitachi Constr Mach Co Ltd Oil-pressure circuit for oil-pressure working machine
JPS57184136A (en) * 1981-05-06 1982-11-12 Hitachi Constr Mach Co Ltd Oil-pressure circuit for oil-pressure working machine
JPS5969259U (en) * 1982-10-29 1984-05-10 株式会社クボタ Hydraulic circuit of backhoe with earth removal device
JPS6047333A (en) * 1983-08-24 1985-03-14 Toshiba Corp Terminal pin of base for bulb
JPS6096479U (en) * 1983-12-05 1985-07-01 日立建機株式会社 Hydraulic circuit of hydraulic machine with blade

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57184137A (en) * 1981-05-06 1982-11-12 Hitachi Constr Mach Co Ltd Oil-pressure circuit for oil-pressure working machine
JPS57184136A (en) * 1981-05-06 1982-11-12 Hitachi Constr Mach Co Ltd Oil-pressure circuit for oil-pressure working machine
JPH0128177B2 (en) * 1981-05-06 1989-06-01 Hitachi Construction Machinery
JPS5969259U (en) * 1982-10-29 1984-05-10 株式会社クボタ Hydraulic circuit of backhoe with earth removal device
JPH0351409Y2 (en) * 1982-10-29 1991-11-05
JPS6047333A (en) * 1983-08-24 1985-03-14 Toshiba Corp Terminal pin of base for bulb
JPS6096479U (en) * 1983-12-05 1985-07-01 日立建機株式会社 Hydraulic circuit of hydraulic machine with blade

Also Published As

Publication number Publication date
JPS5919214B2 (en) 1984-05-04

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