JPS5586907A - Three-pump hydraulic circuit for construction machinery or the like - Google Patents

Three-pump hydraulic circuit for construction machinery or the like

Info

Publication number
JPS5586907A
JPS5586907A JP16234778A JP16234778A JPS5586907A JP S5586907 A JPS5586907 A JP S5586907A JP 16234778 A JP16234778 A JP 16234778A JP 16234778 A JP16234778 A JP 16234778A JP S5586907 A JPS5586907 A JP S5586907A
Authority
JP
Japan
Prior art keywords
pumps
directional control
engine
control valve
pump
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
JP16234778A
Other languages
Japanese (ja)
Inventor
Hajime Suzuki
Masahiro Nanbu
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.)
Japan Steel Works Ltd
Original Assignee
Japan Steel Works 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 Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP16234778A priority Critical patent/JPS5586907A/en
Publication of JPS5586907A publication Critical patent/JPS5586907A/en
Pending legal-status Critical Current

Links

Landscapes

  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To select an optimal pump depending on necessity and efficiently use the output of an engine, by providing two hydraulic pumps of equal small capacity and a pump whose capacity is double that of the former pumps.
CONSTITUTION: Two hydraulic pumps 2a', 2b' of equal small capacity and a hydraulic pump 2c', whose capacity is double that of the former pumps, are coupled to the output shaft of the engine 1 of construction equipment. The discharge ports of the pumps are connected to the inlet ports 8aW8c of a two-position six-port directional control valve 8. Two outlet ports 8d, 8e of the directional control valve 8 are connected through ducts 9a, 9b to tandem directional control valves 5a, 5b, which control oil supply to actuators 6 (6aW6f). Optional switching can be effected by the directional control valve 8 to utilize the three pumps for work or running or utilize only two pumps 2a', 2b'. This results in effectively using the output of the engine.
COPYRIGHT: (C)1980,JPO&Japio
JP16234778A 1978-12-22 1978-12-22 Three-pump hydraulic circuit for construction machinery or the like Pending JPS5586907A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16234778A JPS5586907A (en) 1978-12-22 1978-12-22 Three-pump hydraulic circuit for construction machinery or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16234778A JPS5586907A (en) 1978-12-22 1978-12-22 Three-pump hydraulic circuit for construction machinery or the like

Publications (1)

Publication Number Publication Date
JPS5586907A true JPS5586907A (en) 1980-07-01

Family

ID=15752822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16234778A Pending JPS5586907A (en) 1978-12-22 1978-12-22 Three-pump hydraulic circuit for construction machinery or the like

Country Status (1)

Country Link
JP (1) JPS5586907A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180855U (en) * 1984-10-31 1986-05-29
JPS61188653U (en) * 1985-05-18 1986-11-25
JPS6386170U (en) * 1986-11-19 1988-06-06

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180855U (en) * 1984-10-31 1986-05-29
JPS61188653U (en) * 1985-05-18 1986-11-25
JPS6386170U (en) * 1986-11-19 1988-06-06

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