JPS5770979A - Variable displacement hydraulic pump - Google Patents
Variable displacement hydraulic pumpInfo
- Publication number
- JPS5770979A JPS5770979A JP55147128A JP14712880A JPS5770979A JP S5770979 A JPS5770979 A JP S5770979A JP 55147128 A JP55147128 A JP 55147128A JP 14712880 A JP14712880 A JP 14712880A JP S5770979 A JPS5770979 A JP S5770979A
- Authority
- JP
- Japan
- Prior art keywords
- pump
- speed sensing
- discharge conduit
- control
- control pistons
- 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
Abstract
PURPOSE: To prevent occurance of engine stop, by connecting discharge conduit a speed sensing pump which is provided coaxially with pump elements to the pressurizing chamber of control pistons.
CONSTITUTION: A speed sensing pump P, in which a discharging conduit 6 is connected to a tank T through a relief valve 7 and open/close valve 8, is provided coaxially with a pump element A, and control pistons 60 are arranged on an operation side of discharging pressure of spools in control valve units B. Furthermore, the discharge conduit 6 of the speed sensing pump P is connected to the pressurizing chambers 61 of the control pistons 60. When the driving torque of the pump exceeds engine torque, the open/close valve 8 is closed and the power applied to the discharge conduit 6 and the control piston 60 become equal with a predetermined pressure so as to restrain the output of the pump element A, therefore, the occurance of an engine stop is prevented.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55147128A JPS5770979A (en) | 1980-10-20 | 1980-10-20 | Variable displacement hydraulic pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55147128A JPS5770979A (en) | 1980-10-20 | 1980-10-20 | Variable displacement hydraulic pump |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5770979A true JPS5770979A (en) | 1982-05-01 |
JPH0154556B2 JPH0154556B2 (en) | 1989-11-20 |
Family
ID=15423181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55147128A Granted JPS5770979A (en) | 1980-10-20 | 1980-10-20 | Variable displacement hydraulic pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5770979A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51147001A (en) * | 1975-06-04 | 1976-12-17 | Caterpillar Tractor Co | Overrriding means for pumps at semiithrottled control condition |
-
1980
- 1980-10-20 JP JP55147128A patent/JPS5770979A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51147001A (en) * | 1975-06-04 | 1976-12-17 | Caterpillar Tractor Co | Overrriding means for pumps at semiithrottled control condition |
Also Published As
Publication number | Publication date |
---|---|
JPH0154556B2 (en) | 1989-11-20 |
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