JPS56159584A - Oil pressure control circuit for construction machine - Google Patents
Oil pressure control circuit for construction machineInfo
- Publication number
- JPS56159584A JPS56159584A JP6273480A JP6273480A JPS56159584A JP S56159584 A JPS56159584 A JP S56159584A JP 6273480 A JP6273480 A JP 6273480A JP 6273480 A JP6273480 A JP 6273480A JP S56159584 A JPS56159584 A JP S56159584A
- Authority
- JP
- Japan
- Prior art keywords
- variable
- variable pump
- pump
- pumps
- pilot
- 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)
- Details Of Reciprocating Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To reduce pump power consumption by a method wherein the exhaust pressures of a plurality of variable pumps driven by a single motor are made to communicate with one another by the provision of pilot circuits.
CONSTITUTION: The pressures behind first chokes 19 and 20 are applied on servo valves 11 and 12 of the control sections 8 and 9 of the first and the second variable pumps 1 and 2, respectively, which are driven by the single motor 4 and the pressure of a discharge circuit 5 of the first variable pump is applied on a switching valve 24 of the second variable pump through the first pilot circuit 27 and the pressure of a discharge circuit 6 of the second variable pump 2 is applied on a switching valve 23 of the first variable pump 1 through the second pilot circuit 28. Further, the first and the second pilot circuits 27 and 28 are made to open through change- over valves 30 and 31 which are actuated by the exhaust pressure of the third variable pump 3. As a result, the first and the second variable pumps 1 and 2 can accommodate their outputs with each other while the third variable pump 3 is in use and the outputs of the variable pumps 1 and 2 can be increased when the variable pump 3 is not in use.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55062734A JPS5857636B2 (en) | 1980-05-14 | 1980-05-14 | Hydraulic control circuit device for construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55062734A JPS5857636B2 (en) | 1980-05-14 | 1980-05-14 | Hydraulic control circuit device for construction machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56159584A true JPS56159584A (en) | 1981-12-08 |
| JPS5857636B2 JPS5857636B2 (en) | 1983-12-21 |
Family
ID=13208893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55062734A Expired JPS5857636B2 (en) | 1980-05-14 | 1980-05-14 | Hydraulic control circuit device for construction machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5857636B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5712102U (en) * | 1980-06-25 | 1982-01-22 | ||
| JPS5716288A (en) * | 1980-06-30 | 1982-01-27 | Japan Steel Works Ltd:The | Hydraulic circuit for a plurality of pumps |
| US4880359A (en) * | 1986-11-14 | 1989-11-14 | Hydromatik Gmbh | Summation power output regulating system for at least two hydrostatic transmissions |
-
1980
- 1980-05-14 JP JP55062734A patent/JPS5857636B2/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5712102U (en) * | 1980-06-25 | 1982-01-22 | ||
| JPS5716288A (en) * | 1980-06-30 | 1982-01-27 | Japan Steel Works Ltd:The | Hydraulic circuit for a plurality of pumps |
| JPH0154555B2 (en) * | 1980-06-30 | 1989-11-20 | Japan Steel Works Ltd | |
| US4880359A (en) * | 1986-11-14 | 1989-11-14 | Hydromatik Gmbh | Summation power output regulating system for at least two hydrostatic transmissions |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5857636B2 (en) | 1983-12-21 |
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