JPS57103964A - Closed circuit type hydraulic circuit - Google Patents

Closed circuit type hydraulic circuit

Info

Publication number
JPS57103964A
JPS57103964A JP17801780A JP17801780A JPS57103964A JP S57103964 A JPS57103964 A JP S57103964A JP 17801780 A JP17801780 A JP 17801780A JP 17801780 A JP17801780 A JP 17801780A JP S57103964 A JPS57103964 A JP S57103964A
Authority
JP
Japan
Prior art keywords
hydraulic pump
closed circuit
hydraulic
valve
connected via
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
JP17801780A
Other languages
Japanese (ja)
Other versions
JPS6115308B2 (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 JP17801780A priority Critical patent/JPS57103964A/en
Publication of JPS57103964A publication Critical patent/JPS57103964A/en
Publication of JPS6115308B2 publication Critical patent/JPS6115308B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Fluid Gearings (AREA)

Abstract

PURPOSE: To improve the piping constitution for a torque control apparatus in a closed circuit hydraulic circuit used for swinging action, etc. of a hydraulic shovel so as to improve the performances such as slope retention performance and reduction performance at neutral reduction operation such as slewing.
CONSTITUTION: A closed circuit pump 2 that is connected via pipings (a, b) to a slewing motor 1 comprises a reversible hydraulic pump 2a whose capacity is variable, a hydraulic pump 2b that serves as a source for generating a hydraulic pressure for the operation of a pilot, a hydraulic pump 2c for supplying an oil into the closed circuit, cross-over relief valves 2e, 2e', a relief valve 2f for controlling the supplied pressure in the closed circuit, etc. The hydraulic pump 2b is controlled by a torque control apparatus 3, and the chambers A, B thereof are connected via a pilot valve 6 to the hydraulic pump 2b. Piston chambers E, F are connected via a change-over valve 8 to the hydraulic pump 2b, and the pilot port of the change-over valve is connected to a shuttle valve 5.
COPYRIGHT: (C)1982,JPO&Japio
JP17801780A 1980-12-18 1980-12-18 Closed circuit type hydraulic circuit Granted JPS57103964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17801780A JPS57103964A (en) 1980-12-18 1980-12-18 Closed circuit type hydraulic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17801780A JPS57103964A (en) 1980-12-18 1980-12-18 Closed circuit type hydraulic circuit

Publications (2)

Publication Number Publication Date
JPS57103964A true JPS57103964A (en) 1982-06-28
JPS6115308B2 JPS6115308B2 (en) 1986-04-23

Family

ID=16041106

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17801780A Granted JPS57103964A (en) 1980-12-18 1980-12-18 Closed circuit type hydraulic circuit

Country Status (1)

Country Link
JP (1) JPS57103964A (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
JPS6115308B2 (en) 1986-04-23

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