JPS57241A - Controller for oil pressure of construction equipment - Google Patents

Controller for oil pressure of construction equipment

Info

Publication number
JPS57241A
JPS57241A JP7149180A JP7149180A JPS57241A JP S57241 A JPS57241 A JP S57241A JP 7149180 A JP7149180 A JP 7149180A JP 7149180 A JP7149180 A JP 7149180A JP S57241 A JPS57241 A JP S57241A
Authority
JP
Japan
Prior art keywords
discharge
port
pump
pressure chamber
pressure
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
JP7149180A
Other languages
Japanese (ja)
Other versions
JPH0255569B2 (en
Inventor
Hidekazu Sato
Mitsuru Arai
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 JP7149180A priority Critical patent/JPS57241A/en
Priority to GB8116265A priority patent/GB2081394B/en
Priority to IT22037/81A priority patent/IT1137040B/en
Priority to DE19813121483 priority patent/DE3121483A1/en
Priority to US06/268,235 priority patent/US4449366A/en
Priority to FR8110788A priority patent/FR2483487A1/en
Publication of JPS57241A publication Critical patent/JPS57241A/en
Publication of JPH0255569B2 publication Critical patent/JPH0255569B2/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
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement 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
    • 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
    • E02F9/2282—Systems using center bypass type changeover valves
    • 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
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/255—Flow control functions
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Abstract

PURPOSE:To greatly reduce the loss of horsepower by controlling the discharge of a variable discharge pump automatically to a mimimum value when all of operating valves are restored to neutral position. CONSTITUTION:When all spools of operating valve groups are restored to neutral position due to the temporary stoppage of the operation of a construction equipment, etc., between the pilot port and the tank port of each operation valve is broken, whereby the pressure of the pressure chamber 15c of a PC pilot switch valve 15 becomes equal to that of the spring chamber 15g and the spool 15b is pushed toward left side by a compression spring 16. Since the charge pressure of the pump port 153 is supplied through a PC port 154 to the pressure chamber of a pump neutral controller, piston inside the pressure chamber moves toward discharge-reducing direction, so that the discharge of each discharge pump is maintained at minimum value. Thus, the loss of horsepower can be greatly reduce and the cost of fuel can be also improved.
JP7149180A 1980-05-30 1980-05-30 Controller for oil pressure of construction equipment Granted JPS57241A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP7149180A JPS57241A (en) 1980-05-30 1980-05-30 Controller for oil pressure of construction equipment
GB8116265A GB2081394B (en) 1980-05-30 1981-05-28 Hydraulic systems
IT22037/81A IT1137040B (en) 1980-05-30 1981-05-29 HYDRAULIC CONTROL SYSTEM FOR SELF-PROPELLED OFF-ROAD WORKING MACHINES
DE19813121483 DE3121483A1 (en) 1980-05-30 1981-05-29 "HYDRAULIC CONTROL SYSTEM FOR SELF-DRIVING WORKING MACHINES"
US06/268,235 US4449366A (en) 1980-05-30 1981-05-29 Hydraulic control system for off-highway self-propelled work machines
FR8110788A FR2483487A1 (en) 1980-05-30 1981-06-01 HYDRAULIC CONTROL SYSTEM FOR ALL-TERRAIN SELF-PROPELLED WORKING MACHINES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7149180A JPS57241A (en) 1980-05-30 1980-05-30 Controller for oil pressure of construction equipment

Publications (2)

Publication Number Publication Date
JPS57241A true JPS57241A (en) 1982-01-05
JPH0255569B2 JPH0255569B2 (en) 1990-11-27

Family

ID=13462175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7149180A Granted JPS57241A (en) 1980-05-30 1980-05-30 Controller for oil pressure of construction equipment

Country Status (1)

Country Link
JP (1) JPS57241A (en)

Also Published As

Publication number Publication date
JPH0255569B2 (en) 1990-11-27

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