JPS57103964A - Closed circuit type hydraulic circuit - Google Patents
Closed circuit type hydraulic circuitInfo
- 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
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
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)
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 |
-
1980
- 1980-12-18 JP JP17801780A patent/JPS57103964A/en active Granted
Cited By (1)
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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