JPS57180723A - Hydraulic circuit of civil engineering construction machinery - Google Patents

Hydraulic circuit of civil engineering construction machinery

Info

Publication number
JPS57180723A
JPS57180723A JP6390081A JP6390081A JPS57180723A JP S57180723 A JPS57180723 A JP S57180723A JP 6390081 A JP6390081 A JP 6390081A JP 6390081 A JP6390081 A JP 6390081A JP S57180723 A JPS57180723 A JP S57180723A
Authority
JP
Japan
Prior art keywords
line
switching valve
hydraulic circuit
arm
load
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
JP6390081A
Other languages
Japanese (ja)
Other versions
JPH0128176B2 (en
Inventor
Toshimichi Ikeda
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 JP6390081A priority Critical patent/JPS57180723A/en
Publication of JPS57180723A publication Critical patent/JPS57180723A/en
Publication of JPH0128176B2 publication Critical patent/JPH0128176B2/ja
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To minimize a pressure loss of a hydraulic circuit and to prevent the rise in temperature of the hydraulic circuit, by a method wherein a parallel line is formed so that, when switching valves located in parallel are operated simultaneously, the one switching valve is reduced in load and the other is increased in load. CONSTITUTION:An arm switching valve 24 is changed over in a I-direction and a revolution switching valve 23 in a II-direction to feed a part of pressure oil in a pump 2 to a revolving motor through a discharge line b, a line Z, a port m', and a line m, and other pressure oil to an arm cylinder 40 through a pipe Zb, a relief valve F, a check valve J, a port t', and a line t. Thus, even if a load of an arm is low, the revloving motor is enoughly revolved with the pressure in the line Zb. If the arm switching valve 24 is switched in the II-direction and the revolution switching valve 23 in the I-direction, a part of the pressure oil is fed to a revolving motor 50 through a Za, a S' and a S, and this permits the revolving motor to run at a given speed.
JP6390081A 1981-04-30 1981-04-30 Hydraulic circuit of civil engineering construction machinery Granted JPS57180723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6390081A JPS57180723A (en) 1981-04-30 1981-04-30 Hydraulic circuit of civil engineering construction machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6390081A JPS57180723A (en) 1981-04-30 1981-04-30 Hydraulic circuit of civil engineering construction machinery

Publications (2)

Publication Number Publication Date
JPS57180723A true JPS57180723A (en) 1982-11-06
JPH0128176B2 JPH0128176B2 (en) 1989-06-01

Family

ID=13242642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6390081A Granted JPS57180723A (en) 1981-04-30 1981-04-30 Hydraulic circuit of civil engineering construction machinery

Country Status (1)

Country Link
JP (1) JPS57180723A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014056592A1 (en) * 2012-10-10 2014-04-17 Robert Bosch Gmbh Open-centre valve block with two pump connections and associated auxiliary sliders on the main sliders

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014056592A1 (en) * 2012-10-10 2014-04-17 Robert Bosch Gmbh Open-centre valve block with two pump connections and associated auxiliary sliders on the main sliders

Also Published As

Publication number Publication date
JPH0128176B2 (en) 1989-06-01

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