JPS5762982A - Oil hydraulic unit - Google Patents
Oil hydraulic unitInfo
- Publication number
- JPS5762982A JPS5762982A JP55138498A JP13849880A JPS5762982A JP S5762982 A JPS5762982 A JP S5762982A JP 55138498 A JP55138498 A JP 55138498A JP 13849880 A JP13849880 A JP 13849880A JP S5762982 A JPS5762982 A JP S5762982A
- Authority
- JP
- Japan
- Prior art keywords
- pump
- variable displacement
- main pump
- pressure
- load side
- 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.)
- Pending
Links
Landscapes
- Details Of Reciprocating Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To reduce electric power of consumption remarkably by a method wherein a variable displacement pump of small capacity is provided in parallel to a main pump as a leak compensation, maintains pressure on a load side and consumes power according to a load.
CONSTITUTION: The variable displacement pump of small capacity 8 is provided in parallel to the main pump 3. When no flow is required on the load side by the continuous operation of the variable displacement pump or the main pump 3 is stopped, pressure is maintained on the load side. The load current of a motor 9 for the pump 8 is satisfied with less than one-tenth of that of a motor 2 for the main pump 3. Beside, the pump 8 is of variable displacement and only the flow necessary for maintaining the pressure on the load side is discharged automaticlly and nothing unnecessary is conducted. In this case, since the main pump also is not in motion, the electric power for maintaining pressure is of the necessary minimum and the quantity of power of consumption can be reduced remarkably.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55138498A JPS5762982A (en) | 1980-10-02 | 1980-10-02 | Oil hydraulic unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55138498A JPS5762982A (en) | 1980-10-02 | 1980-10-02 | Oil hydraulic unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5762982A true JPS5762982A (en) | 1982-04-16 |
Family
ID=15223517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55138498A Pending JPS5762982A (en) | 1980-10-02 | 1980-10-02 | Oil hydraulic unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5762982A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59107071U (en) * | 1983-01-08 | 1984-07-19 | 株式会社新潟鐵工所 | Concrete pump hydraulic circuit |
JP2009085016A (en) * | 2007-09-27 | 2009-04-23 | Nobuyuki Sugimura | Liquid pressure unit |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5670106A (en) * | 1979-11-12 | 1981-06-11 | Daikin Ind Ltd | Combination fluid circuit |
-
1980
- 1980-10-02 JP JP55138498A patent/JPS5762982A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5670106A (en) * | 1979-11-12 | 1981-06-11 | Daikin Ind Ltd | Combination fluid circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59107071U (en) * | 1983-01-08 | 1984-07-19 | 株式会社新潟鐵工所 | Concrete pump hydraulic circuit |
JP2009085016A (en) * | 2007-09-27 | 2009-04-23 | Nobuyuki Sugimura | Liquid pressure unit |
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