JPS552171A - Hydraulic excavator - Google Patents

Hydraulic excavator

Info

Publication number
JPS552171A
JPS552171A JP3702979A JP3702979A JPS552171A JP S552171 A JPS552171 A JP S552171A JP 3702979 A JP3702979 A JP 3702979A JP 3702979 A JP3702979 A JP 3702979A JP S552171 A JPS552171 A JP S552171A
Authority
JP
Japan
Prior art keywords
hydraulic
turning
pumps
hydraulic pump
servo
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
JP3702979A
Other languages
Japanese (ja)
Other versions
JPS591882B2 (en
Inventor
Norishige Muto
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP54037029A priority Critical patent/JPS591882B2/en
Publication of JPS552171A publication Critical patent/JPS552171A/en
Publication of JPS591882B2 publication Critical patent/JPS591882B2/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
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps

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)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE:To provide a hydraulic excavator which is provided with two hydraulic pumps for operation and traveling and one hydraulic pump for turning, and at the time of non-turning the hydraulic pump for turning is drained, and the discharge quantity of the hydraulic pump for traveling at the time of turning is reduced and the engine power is effectively utilized. CONSTITUTION:Among hydraulic pumps 1, 2 and 3 driven by one and same engine 6, hydraluic pumps 1 and 2 constitute a main pump, and are connected to operating valves 4 and 5, the hydraulic pump 3 being connected to a turning operating valve 7. The adjusting members 1a and 2a of the hydraulic pumps 1 and 2 are connected to the servo rod 10 of a servo valve 9, and hydraulic chambers 14a and 14b of a servo cylinder 11 are connected to hydraulic pumps 1 and 2, respectively, and the hydraulic chamber 17 of a cylinder 15 to which servo cylinder 11 is slidably fitted is connected with a pilot circuit 18 connected to the circuit of the hydraulic pump 3.
JP54037029A 1979-03-30 1979-03-30 Multiple hydraulic pump device Expired JPS591882B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54037029A JPS591882B2 (en) 1979-03-30 1979-03-30 Multiple hydraulic pump device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54037029A JPS591882B2 (en) 1979-03-30 1979-03-30 Multiple hydraulic pump device

Publications (2)

Publication Number Publication Date
JPS552171A true JPS552171A (en) 1980-01-09
JPS591882B2 JPS591882B2 (en) 1984-01-14

Family

ID=12486205

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54037029A Expired JPS591882B2 (en) 1979-03-30 1979-03-30 Multiple hydraulic pump device

Country Status (1)

Country Link
JP (1) JPS591882B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01119890U (en) * 1988-02-10 1989-08-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01119890U (en) * 1988-02-10 1989-08-14

Also Published As

Publication number Publication date
JPS591882B2 (en) 1984-01-14

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