JPS57143179A - Power controller for variable displacement pump - Google Patents

Power controller for variable displacement pump

Info

Publication number
JPS57143179A
JPS57143179A JP56027297A JP2729781A JPS57143179A JP S57143179 A JPS57143179 A JP S57143179A JP 56027297 A JP56027297 A JP 56027297A JP 2729781 A JP2729781 A JP 2729781A JP S57143179 A JPS57143179 A JP S57143179A
Authority
JP
Japan
Prior art keywords
piston
spool
acts
regulator
delivery 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.)
Pending
Application number
JP56027297A
Other languages
Japanese (ja)
Inventor
Toichi Hirata
Toshimichi Ikeda
Seiji Tamura
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 JP56027297A priority Critical patent/JPS57143179A/en
Publication of JPS57143179A publication Critical patent/JPS57143179A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE:To decrease movable parts of a regulator simultaneously simplify its construction, by interposing a stepped piston to a spool mechanism in the power control regulator for the above described pump and stopping the spool at control operation. CONSTITUTION:At control operation, own pump delivery pressure Pd1 acts upon a minor chamber 32 of a servo piston 8, port 16 of a spool 12 and port 18 of a piston 17 in a regulator, and remote pump delivery pressure Pd2 acts upon the stepped part of a stepped piston 50. Here, for instance, the spool 12 is pressed leftward by the own delivery pressure Pd1, then the pressure Pd1 acts upon the minor chamber 32 and major chamber 29 of the piston 8, and the piston 8 is displaced rightward. At this time, a tilting lever 40 presses back the spool 12 rightward. In this way, the spool 12 is urged by the servo piston 8 in such a state as to always stop in a position as shown in the drawing.
JP56027297A 1981-02-26 1981-02-26 Power controller for variable displacement pump Pending JPS57143179A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56027297A JPS57143179A (en) 1981-02-26 1981-02-26 Power controller for variable displacement pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56027297A JPS57143179A (en) 1981-02-26 1981-02-26 Power controller for variable displacement pump

Publications (1)

Publication Number Publication Date
JPS57143179A true JPS57143179A (en) 1982-09-04

Family

ID=12217148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56027297A Pending JPS57143179A (en) 1981-02-26 1981-02-26 Power controller for variable displacement pump

Country Status (1)

Country Link
JP (1) JPS57143179A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613286A (en) * 1984-12-31 1986-09-23 Kabushiki Kaisha Komatsu Seisakusho Constant torque control system for a variable displacement pump or pumps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613286A (en) * 1984-12-31 1986-09-23 Kabushiki Kaisha Komatsu Seisakusho Constant torque control system for a variable displacement pump or pumps

Similar Documents

Publication Publication Date Title
GB989227A (en) Control mechanism for a driving unit consisting of a driving engine and an infinitely variable speed gear
GB1400381A (en) Proportional servo actuators
JPS52106529A (en) Control system for controlling flow rate of fluid
GB1474421A (en) Variable pressure hydraulic system
GB1401839A (en) Fluid power systems
JPS57110855A (en) Controller of oil hydraulic device
JPS5543245A (en) Volume controller of variable hydraulic pump
JPS57143179A (en) Power controller for variable displacement pump
ES455437A1 (en) Differential pressure operated switch
JPS5587865A (en) Control circuit of variable capacity pump
GB928078A (en) Hydraulic reversing control
GB1180189A (en) Improvements in Fluid-pressure Servo Adjusting Devices
GB1445680A (en) Apparatus for controlling the operation of fluid pressure motors
GB1406090A (en) Flow control means for hydraulic systems
JPS57134064A (en) Controller for hydraulic system
JPS5783701A (en) Hydraulic controller
JPS5279195A (en) Piston positional shift regulating controller
JPS57171087A (en) Variable displacement type hydraulic pump
JPS57177407A (en) Flow regulation valve and hydraulic control valve for injection molding machine employing said valve
JPS5690158A (en) Slewing drive controller
JPS57173534A (en) Engine driven oil hydraulic power source device
FR2430634A1 (en) Hydraulic device pressure regulator - has piston moved by fluid pressure against spring to selectively vent fluid and control pressure
FR2257372A1 (en) Injector for pressure die casting machine - with intensifier piston connected via valve to low pressure reservoir
JPH0218321Y2 (en)
GB1526085A (en) Hydraulic pumping arrangements