JPS5660890A - Control device for variable delivery pump - Google Patents
Control device for variable delivery pumpInfo
- Publication number
- JPS5660890A JPS5660890A JP13525279A JP13525279A JPS5660890A JP S5660890 A JPS5660890 A JP S5660890A JP 13525279 A JP13525279 A JP 13525279A JP 13525279 A JP13525279 A JP 13525279A JP S5660890 A JPS5660890 A JP S5660890A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- pump
- engine
- control cylinder
- control
- 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
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To improve a starting capacity of engine by minimizing load torque of a pump during engine starting.
CONSTITUTION: This control device consists of a control cylinder 7, a pressure generation unit 5, and a pressure control valve 8. The control cylinder 7 increases the discharge quantity of a variable delivery pump 1, when a supply pressure is increased. The pressure generation unit 5 produces a pressure P1 responding to flow rates passing through a pipe line 4, connected to a center bypass of a shift valve 2. The pressure control valve 8 supplies the pressure P1 to said control cylinder 7, if the pressure P1 falls below a predetermined pressure P0 and feeds a pressure P2 in reverse proportion to the pressure P1, if said pressure P1 exceeds the predetermined pressure P0. This construction brings the pressures P1 to nought and minimizes the inclined rotation angle of a tilted plate of the pump 1. If the shift valve 2 lets the engine start under neutral conditions, however, the pressure P1 is promptly increased to P1 max. and the pressure P2 is quickly reduced to P2 min. as well. Thus the minimum discharge quantity of the pump 1 is maintained and the starting capacity of the engine improved.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13525279A JPS5660890A (en) | 1979-10-22 | 1979-10-22 | Control device for variable delivery pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13525279A JPS5660890A (en) | 1979-10-22 | 1979-10-22 | Control device for variable delivery pump |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5660890A true JPS5660890A (en) | 1981-05-26 |
Family
ID=15147358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13525279A Pending JPS5660890A (en) | 1979-10-22 | 1979-10-22 | Control device for variable delivery pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5660890A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5963386A (en) * | 1982-09-02 | 1984-04-11 | ハイドロマチツク・ゲゼルシヤフト・ミツト・ベシユレンクタ−ハフツング | Output control apparatus for hydraulic pump |
-
1979
- 1979-10-22 JP JP13525279A patent/JPS5660890A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5963386A (en) * | 1982-09-02 | 1984-04-11 | ハイドロマチツク・ゲゼルシヤフト・ミツト・ベシユレンクタ−ハフツング | Output control apparatus for hydraulic pump |
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