JPS5660890A - Control device for variable delivery pump - Google Patents

Control device for variable delivery pump

Info

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
Application number
JP13525279A
Other languages
Japanese (ja)
Inventor
Masaki Kanehara
Shuichi Ichiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP13525279A priority Critical patent/JPS5660890A/en
Publication of JPS5660890A publication Critical patent/JPS5660890A/en
Pending legal-status Critical Current

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  • 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
JP13525279A 1979-10-22 1979-10-22 Control device for variable delivery pump Pending JPS5660890A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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