JPS5761124A - Oil pressure circuit for construction machinery - Google Patents
Oil pressure circuit for construction machineryInfo
- Publication number
- JPS5761124A JPS5761124A JP13529980A JP13529980A JPS5761124A JP S5761124 A JPS5761124 A JP S5761124A JP 13529980 A JP13529980 A JP 13529980A JP 13529980 A JP13529980 A JP 13529980A JP S5761124 A JPS5761124 A JP S5761124A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- valve
- pressure
- motor
- 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 to suction in the oil-pressure circuit of an oil-pressure type rotary excavator, etc., by using a system in which a brake valve is made up of two counter-balance valves and return oil from an oil-pressure motor is directed toward the suction side of the oil-pressure motor.
CONSTITUTION: Oil pressure of an oil-pressure pump 1 is supplied through an operating valve 2 and a brake valve 3 to an oil pressure motor 4 to turn the motor 4, whereby driving a load 4a. In this case, the brake valve 3 is made up to the first counter-balance valve 5 and the second counter-balance valve 6. When restoring the operating valve 2 to neutral position to stop the load 4a, the first valve 5 is instantaneously restored to neutral position and the second valve 6 is slowly restored to the neutral position by throttles 15 and 16 provided in a pilot circuit. Thus, even when the oil-pressure motor 4 is driven by loading inertia, the occurrence of cavitation due to the shortage of suction can be prevented without causing oil shortage on the suction side of the oil-pressure motor 4.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13529980A JPS5761124A (en) | 1980-09-30 | 1980-09-30 | Oil pressure circuit for construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13529980A JPS5761124A (en) | 1980-09-30 | 1980-09-30 | Oil pressure circuit for construction machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5761124A true JPS5761124A (en) | 1982-04-13 |
Family
ID=15148451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13529980A Pending JPS5761124A (en) | 1980-09-30 | 1980-09-30 | Oil pressure circuit for construction machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5761124A (en) |
-
1980
- 1980-09-30 JP JP13529980A patent/JPS5761124A/en active Pending
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