JPS5786654A - Closed hydraulic circuit - Google Patents

Closed hydraulic circuit

Info

Publication number
JPS5786654A
JPS5786654A JP16075780A JP16075780A JPS5786654A JP S5786654 A JPS5786654 A JP S5786654A JP 16075780 A JP16075780 A JP 16075780A JP 16075780 A JP16075780 A JP 16075780A JP S5786654 A JPS5786654 A JP S5786654A
Authority
JP
Japan
Prior art keywords
valve
pilot
chambers
passages
hydraulic 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.)
Granted
Application number
JP16075780A
Other languages
Japanese (ja)
Other versions
JPS6115307B2 (en
Inventor
Masaharu Kawamoto
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.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries 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 Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP16075780A priority Critical patent/JPS5786654A/en
Publication of JPS5786654A publication Critical patent/JPS5786654A/en
Publication of JPS6115307B2 publication Critical patent/JPS6115307B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To improve the neutral speed reduction performance of a hydraulic shovel or the like in its turning or the like and improve the holding performance of the shovel or the like on a slope, by always detecting pilot pressure for the operation of a hydraulic pump to judge whether or not a speed reduction circuit should be put in operation.
CONSTITUTION: Chambers A, B on the piston 3A of a controller 3 for regulating the hydraulic pump 2a of a closed hydraulic circuit are connected to a pilot oil pressure source through a pilot valve 6. Chambers C, D on pistons 3B, 3C are connected to the pilot ports of a changeover valve 10 through passages (c)W (f) at both the sides of the hydraulic pump 2a and through a changeover valve 8 and passages (g), (h). Passages (k), (l) for connecting the pilot valve 6 to the chambers A, B of the controller 3 are coupled to each other through a shuttle valve 5. The shuttle valve 5 is connected to the port of the changeover valve 8. Piston chambers E, F on pistons 4a, 4b are connected to an oil pressure source through the changeover valve 10.
COPYRIGHT: (C)1982,JPO&Japio
JP16075780A 1980-11-17 1980-11-17 Closed hydraulic circuit Granted JPS5786654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16075780A JPS5786654A (en) 1980-11-17 1980-11-17 Closed hydraulic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16075780A JPS5786654A (en) 1980-11-17 1980-11-17 Closed hydraulic circuit

Publications (2)

Publication Number Publication Date
JPS5786654A true JPS5786654A (en) 1982-05-29
JPS6115307B2 JPS6115307B2 (en) 1986-04-23

Family

ID=15721802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16075780A Granted JPS5786654A (en) 1980-11-17 1980-11-17 Closed hydraulic circuit

Country Status (1)

Country Link
JP (1) JPS5786654A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06307540A (en) * 1993-04-22 1994-11-01 Kayaba Ind Co Ltd Pump control device for hydrostatic power transmitting mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06307540A (en) * 1993-04-22 1994-11-01 Kayaba Ind Co Ltd Pump control device for hydrostatic power transmitting mechanism

Also Published As

Publication number Publication date
JPS6115307B2 (en) 1986-04-23

Similar Documents

Publication Publication Date Title
JPS57197336A (en) Oil-pressure circuit for turning excavator
JPS57205637A (en) Oil-pressure circuit for travelling of construction machine
JPS5587865A (en) Control circuit of variable capacity pump
EP0404946A4 (en) Hydraulic circuit device of construction vehicle
JPS5786654A (en) Closed hydraulic circuit
AU578147B2 (en) Hydraulic percusive machine
JPS56143857A (en) Stepless hydraulic transmission device
JPS55166507A (en) Circuit for hydraulically movable device
JPS56159584A (en) Oil pressure control circuit for construction machine
JPS54156985A (en) Safety device of hydraulic circuit having a plurality of actuators
JPS5620803A (en) Hydraulic circuit
JPS5783702A (en) Fluid pressure differential circuit
JPS5529671A (en) Control equipment of power steering mechanism
JPS5582865A (en) Change over valve
JPS555132A (en) Hydraulic high speed interlock press with manual operation
JPS5779306A (en) Hydraulic circuit
JPS5683606A (en) Servo valve
JPS56113865A (en) Change-over valve
JPS57103964A (en) Closed circuit type hydraulic circuit
JPS55163304A (en) Change-over device for reciprocation in double-acting cylinder
JPS534928A (en) Control valve for power steering device
JPS5586907A (en) Three-pump hydraulic circuit for construction machinery or the like
JPS5652605A (en) Pressure fluid circuit
JPS56108335A (en) Operating method and apparatus for outrigger in movable crane
JPS5597506A (en) Fluid pressure cylinder for generating vibration