JPS56129786A - Capacity controlling device of variable hydraulic pump - Google Patents
Capacity controlling device of variable hydraulic pumpInfo
- Publication number
- JPS56129786A JPS56129786A JP3166680A JP3166680A JPS56129786A JP S56129786 A JPS56129786 A JP S56129786A JP 3166680 A JP3166680 A JP 3166680A JP 3166680 A JP3166680 A JP 3166680A JP S56129786 A JPS56129786 A JP S56129786A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- valve
- capacity
- cut
- hydraulic pump
- 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
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To simultaneously perform a capacity control, an input torque limitation and an excessive pressure prevention by a method wherein a pilot pump is connected to a servo booster device connected to a direct operating valve through a pressure compensating valve and a cut-off control valve.
CONSTITUTION: The pilot pump 2 is connected to the servo booster 6 which controls the capacity of the variable hydraulic pump 1 receiving the supply of a tank return pressure of the direct operating valve 2 and a supply pressure from the cut- off control valve 26, through the pressure compensating valve 27 which prevents an excessive load on a driving source 3 and makes practical application of a power to the utmost limit and through the cut-off control valve 26 which prevents the excessive pressure without loosing a horse-power. Whereby the pump capacity can be controlled to a value corresponded to an operation stroke of the direct operating valve A, and at the same time, the input torque can be limited and the excessive pressure can be prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3166680A JPS56129786A (en) | 1980-03-14 | 1980-03-14 | Capacity controlling device of variable hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3166680A JPS56129786A (en) | 1980-03-14 | 1980-03-14 | Capacity controlling device of variable hydraulic pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56129786A true JPS56129786A (en) | 1981-10-12 |
Family
ID=12337450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3166680A Pending JPS56129786A (en) | 1980-03-14 | 1980-03-14 | Capacity controlling device of variable hydraulic pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56129786A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5960082A (en) * | 1982-09-30 | 1984-04-05 | Komatsu Ltd | Control device for variable capacity type pump |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53122103A (en) * | 1977-03-31 | 1978-10-25 | Komatsu Ltd | Liquid pressure equipment |
-
1980
- 1980-03-14 JP JP3166680A patent/JPS56129786A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53122103A (en) * | 1977-03-31 | 1978-10-25 | Komatsu Ltd | Liquid pressure equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5960082A (en) * | 1982-09-30 | 1984-04-05 | Komatsu Ltd | Control device for variable capacity type pump |
| JPH0437280B2 (en) * | 1982-09-30 | 1992-06-18 | Komatsu Mfg Co Ltd |
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