JPS5712736A - Hydraulic circuit for hydraulic excavator - Google Patents

Hydraulic circuit for hydraulic excavator

Info

Publication number
JPS5712736A
JPS5712736A JP8453780A JP8453780A JPS5712736A JP S5712736 A JPS5712736 A JP S5712736A JP 8453780 A JP8453780 A JP 8453780A JP 8453780 A JP8453780 A JP 8453780A JP S5712736 A JPS5712736 A JP S5712736A
Authority
JP
Japan
Prior art keywords
hydraulic
running
excavator
change
pumps
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
JP8453780A
Other languages
Japanese (ja)
Inventor
Masatsugu Nagatomo
Katsu Hirozawa
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 JP8453780A priority Critical patent/JPS5712736A/en
Publication of JPS5712736A publication Critical patent/JPS5712736A/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
    • E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Shovels (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

PURPOSE:To control the running speed and the traction of an excavator equipped with a multiarticulated working linkage in steps by providing two main pumps and two auxiliary pumps for the hydraulic circuit of the excavator. CONSTITUTION:In the running mode, hydraulic fluid is supplied to running hydraulic motors 34 and 40 by main pumps 31 and 32 and auxiliary pumps 45 and 46 through the operation of running change-over valves 35 and 41 and running acceleration change-over valves 49 and 50. Hydraulic circuits connected to the running hydraulic motors 34 and 40 can be connected with each other in series or in parallel by changing-over series-parallel change-over valves 70 and 71 through operating a pilot valve 67. Thus the hydraulic circuit is capable of controlling the running speed and the traction of the excavator in steps.
JP8453780A 1980-06-24 1980-06-24 Hydraulic circuit for hydraulic excavator Pending JPS5712736A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8453780A JPS5712736A (en) 1980-06-24 1980-06-24 Hydraulic circuit for hydraulic excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8453780A JPS5712736A (en) 1980-06-24 1980-06-24 Hydraulic circuit for hydraulic excavator

Publications (1)

Publication Number Publication Date
JPS5712736A true JPS5712736A (en) 1982-01-22

Family

ID=13833386

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8453780A Pending JPS5712736A (en) 1980-06-24 1980-06-24 Hydraulic circuit for hydraulic excavator

Country Status (1)

Country Link
JP (1) JPS5712736A (en)

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