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JPS55115606A - Closed hydraulic circuit for controlling operation of pump - Google Patents

Closed hydraulic circuit for controlling operation of pump

Info

Publication number
JPS55115606A
JPS55115606A JP2077679A JP2077679A JPS55115606A JP S55115606 A JPS55115606 A JP S55115606A JP 2077679 A JP2077679 A JP 2077679A JP 2077679 A JP2077679 A JP 2077679A JP S55115606 A JPS55115606 A JP S55115606A
Authority
JP
Japan
Prior art keywords
pump
switching
circuit
neutral position
swash plate
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
JP2077679A
Other languages
Japanese (ja)
Other versions
JPS6333561B2 (en
Inventor
Eiki Izumi
Yoshio Nakajima
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 JP2077679A priority Critical patent/JPS55115606A/en
Priority to IN204/CAL/80A priority patent/IN154141B/en
Priority to DE19803007011 priority patent/DE3007011C2/en
Priority to GB8006247A priority patent/GB2045360B/en
Priority to SE8001459A priority patent/SE448762B/en
Priority to FR8004111A priority patent/FR2449751A1/en
Publication of JPS55115606A publication Critical patent/JPS55115606A/en
Publication of JPS6333561B2 publication Critical patent/JPS6333561B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To improve controllability of pump operation, by reducing inclination of a hydraulic pump to zero when a signal for changeing the driving actuator through shifting of a selector valve is given.
CONSTITUTION: If control lever 17a is operated when hydraulic cylinder 3 is operated by control lever 17b, switching circuits 21a, 21b are closed and opened, respectively, and output of NOT-circuit 23c is 0 and output at the terminal Q of flip-flop circuit 19a remains 0, since the swash plate of hydrualic pump 7 is not located at its neutral position. Further, since output at terminal Q of flip-flop circuit 19b is 1, switching circuit 21c is opened and resultantly the swash plate of hydraulic pump 7 is returned to its neutral position. When the swash plate returns to its neutral position, switching circuit 21c is closed so that hydraulic pump 7 is controlled by the signal of control lever 17a. Thus, it is enabled to omit the switching pedal and to eliminate shocks possible caused at the time of switching, so that controllability of the pump operation can be improved.
COPYRIGHT: (C)1980,JPO&Japio
JP2077679A 1979-02-26 1979-02-26 Closed hydraulic circuit for controlling operation of pump Granted JPS55115606A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2077679A JPS55115606A (en) 1979-02-26 1979-02-26 Closed hydraulic circuit for controlling operation of pump
IN204/CAL/80A IN154141B (en) 1979-02-26 1980-02-22
DE19803007011 DE3007011C2 (en) 1979-02-26 1980-02-25 Hydraulic drive especially for construction machinery and control systems
GB8006247A GB2045360B (en) 1979-02-26 1980-02-25 Drive system for construction machinery
SE8001459A SE448762B (en) 1979-02-26 1980-02-25 HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINERY, INCLUDING A MULTIPLE CLOSED HYDRAULIC CIRCUITS
FR8004111A FR2449751A1 (en) 1979-02-26 1980-02-25 ACTUATION SYSTEM FOR CONSTRUCTION MACHINES AND METHOD FOR CONTROLLING HYDRAULIC CIRCUITS OF SUCH A SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2077679A JPS55115606A (en) 1979-02-26 1979-02-26 Closed hydraulic circuit for controlling operation of pump

Publications (2)

Publication Number Publication Date
JPS55115606A true JPS55115606A (en) 1980-09-05
JPS6333561B2 JPS6333561B2 (en) 1988-07-06

Family

ID=12036545

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2077679A Granted JPS55115606A (en) 1979-02-26 1979-02-26 Closed hydraulic circuit for controlling operation of pump

Country Status (2)

Country Link
JP (1) JPS55115606A (en)
IN (1) IN154141B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6249004A (en) * 1985-08-27 1987-03-03 Komatsu Ltd Hydraulic circuit for construction machine
JPS6391703U (en) * 1986-12-03 1988-06-14
JPS6391702U (en) * 1986-12-03 1988-06-14
JPS6391704U (en) * 1986-12-03 1988-06-14

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6249004A (en) * 1985-08-27 1987-03-03 Komatsu Ltd Hydraulic circuit for construction machine
JPS6391703U (en) * 1986-12-03 1988-06-14
JPS6391702U (en) * 1986-12-03 1988-06-14
JPS6391704U (en) * 1986-12-03 1988-06-14
JPH0512481Y2 (en) * 1986-12-03 1993-03-31

Also Published As

Publication number Publication date
IN154141B (en) 1984-09-22
JPS6333561B2 (en) 1988-07-06

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