JPS54105667A - Hydrulic pressure controller - Google Patents
Hydrulic pressure controllerInfo
- Publication number
- JPS54105667A JPS54105667A JP1148278A JP1148278A JPS54105667A JP S54105667 A JPS54105667 A JP S54105667A JP 1148278 A JP1148278 A JP 1148278A JP 1148278 A JP1148278 A JP 1148278A JP S54105667 A JPS54105667 A JP S54105667A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- oil hydraulic
- pump
- servo
- hydraulic fluid
- 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
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE: To permit supply of flow required for an operation apparatus using a servo valve with reduced power loss and heat generation by providing a small size second pump which can supply servo valve leakage flow even at the time of the low rmp engine operation.
CONSTITUTION: When a directional control valve 15 along is operated without using a servo-valve 9, a solenoid controlled valve 16 is not energized, and chambers 52 and 40 are communicated with a tank. Thus, oil hydraulic fluid discharged from a second pump 7 is unloades through a path 45, and oil hydraulic fluid from a fitst pump 6 enters a chamber 38 and pushed a spool 32 to the left so that it is supplied to an oil hydraulic circuit for ordinary work. When the servo-valve 9 is used, the solenoid controlled valve 16 is energized, and passages 55 and 64 are closed. As a result, oil hydraulic fluid from the second pump 7 is supplied from the chamber 38 to the servo-valve 9. When the quantity of the supplied fluid is small, the oil hydraulic pressure in the chamber 38 is reduced to cause rightward movement of the spool 32, whereby oil hydraulic fluid from a first pump 7 is replenished.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53011482A JPS5916123B2 (en) | 1978-02-06 | 1978-02-06 | hydraulic control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53011482A JPS5916123B2 (en) | 1978-02-06 | 1978-02-06 | hydraulic control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54105667A true JPS54105667A (en) | 1979-08-18 |
JPS5916123B2 JPS5916123B2 (en) | 1984-04-13 |
Family
ID=11779263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53011482A Expired JPS5916123B2 (en) | 1978-02-06 | 1978-02-06 | hydraulic control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5916123B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6194327U (en) * | 1984-11-27 | 1986-06-18 |
-
1978
- 1978-02-06 JP JP53011482A patent/JPS5916123B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5916123B2 (en) | 1984-04-13 |
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