JPS5783753A - Variable capacity type pump control device - Google Patents
Variable capacity type pump control deviceInfo
- Publication number
- JPS5783753A JPS5783753A JP55157339A JP15733980A JPS5783753A JP S5783753 A JPS5783753 A JP S5783753A JP 55157339 A JP55157339 A JP 55157339A JP 15733980 A JP15733980 A JP 15733980A JP S5783753 A JPS5783753 A JP S5783753A
- Authority
- JP
- Japan
- Prior art keywords
- pilot
- pressure
- servo
- inclining
- piston
- 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
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
PURPOSE: To enable effective control with low pump flow rate by providing a compensating piston actuated by the pump discharge pressure and a pilot piston actuated by the external command pressure at a compensation pressure receiving part arranged at the both ends of a spool.
CONSTITUTION: When a pilot pressure Pi is introduced into a pilot chamber 63 at the neutral condition a pilot 62 together with a compensation pressure receiving part 29 moves to right against springs 61 and 30 thereby breaking the balance among the springs 22, 27, 30 and 30' to move a spool 26 to right also, then through holes 42 and 43 are opened to apply the servo pressure Ps to a fluid chamber 46 of a servo cylinder 7 while a servo piston 51 moves to left as a fluid chamber 49 is connected to a tank 65 via a tank passage 39 thereby controlling the inclining angle of a pump 2 via a inclining lever 52 and inclining point pin 53. The movement of the servo piston 51 is transmitted to a sleeve 21 by a feedback lever 8 to close the holes 42 and 43.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55157339A JPS5783753A (en) | 1980-11-07 | 1980-11-07 | Variable capacity type pump control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55157339A JPS5783753A (en) | 1980-11-07 | 1980-11-07 | Variable capacity type pump control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5783753A true JPS5783753A (en) | 1982-05-25 |
JPH0151707B2 JPH0151707B2 (en) | 1989-11-06 |
Family
ID=15647520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55157339A Granted JPS5783753A (en) | 1980-11-07 | 1980-11-07 | Variable capacity type pump control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5783753A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101210733B1 (en) | 2010-12-02 | 2012-12-10 | 두산모트롤주식회사 | The regulator for the hydraulic pump of the excavator |
-
1980
- 1980-11-07 JP JP55157339A patent/JPS5783753A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101210733B1 (en) | 2010-12-02 | 2012-12-10 | 두산모트롤주식회사 | The regulator for the hydraulic pump of the excavator |
Also Published As
Publication number | Publication date |
---|---|
JPH0151707B2 (en) | 1989-11-06 |
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