JPS5761122A - Oil pressure circuit for constructionmachinery - Google Patents
Oil pressure circuit for constructionmachineryInfo
- Publication number
- JPS5761122A JPS5761122A JP13529780A JP13529780A JPS5761122A JP S5761122 A JPS5761122 A JP S5761122A JP 13529780 A JP13529780 A JP 13529780A JP 13529780 A JP13529780 A JP 13529780A JP S5761122 A JPS5761122 A JP S5761122A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- pressure
- motor
- operating valve
- shortage
- 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
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE: To prevent the occurrence of cavitation due to the shortage of suction in the oil pressure circuit of an oil-pressure type rotary excavator, etc., by using a system in which as soon as an operating valve restores to neutral, the whole amount of return oil from oil-pressure motor is returned to the suction side of the oil-pressure motor.
CONSTITUTION: Oil pressure from an oil-pressure pump 1 is supplied through an operating valve 2 and a counter-balance valve 3 to pilelines 4 and 5 to turn an oil- pressure motor 6, whereby driving a load 7 connected to the motor 6. When restoring the operating valve 2 to neutral position 22 to stop the load 7, since the pipelines 8 and 9 are connected with each other because the operating valve 2 is in the neutral position 22, the whole amount of oil pressure discharged by the pumping action of the oil pressure motor 6 by loading inertia is flowed into the pipeline 8 and the counter-balance valve 3. Thus, the occurrence of cavitation due to the shortage of oil can be exactly prevented without causing oil shortage on the suction side of the oil-pressure motor 6.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13529780A JPS5761122A (en) | 1980-09-30 | 1980-09-30 | Oil pressure circuit for constructionmachinery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13529780A JPS5761122A (en) | 1980-09-30 | 1980-09-30 | Oil pressure circuit for constructionmachinery |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5761122A true JPS5761122A (en) | 1982-04-13 |
Family
ID=15148402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13529780A Pending JPS5761122A (en) | 1980-09-30 | 1980-09-30 | Oil pressure circuit for constructionmachinery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5761122A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996018824A1 (en) * | 1994-12-13 | 1996-06-20 | Komatsu Ltd. | Fluid brake device |
-
1980
- 1980-09-30 JP JP13529780A patent/JPS5761122A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996018824A1 (en) * | 1994-12-13 | 1996-06-20 | Komatsu Ltd. | Fluid brake device |
US5884984A (en) * | 1994-12-13 | 1999-03-23 | Komatsu Ltd. | Hydraulic braking apparatus having two safety valves |
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