EP 0821167 A1 19980128 - DISPLACEMENT CONTROLLING DEVICE FOR A VARIABLE DISPLACEMENT TYPE HYDRAULIC PUMP
Title (en)
DISPLACEMENT CONTROLLING DEVICE FOR A VARIABLE DISPLACEMENT TYPE HYDRAULIC PUMP
Title (de)
REGELEINRICHTUNG FÜR EINE HYDRAULIKPUMPE MIT VARIABLER VERDRÄNGUNG
Title (fr)
DISPOSITIF DE COMMANDE DE CYLINDREE DESTINE A UNE POMPE HYDRAULIQUE DE TYPE CYLINDREE VARIABLE
Publication
Application
Priority
- JP 9601005 W 19960411
- JP 8669795 A 19950412
- JP 21473695 A 19950823
Abstract (en)
A displacement controlling device for a variable displacement type hydraulic pump comprising a cylinder (21) for varying the displacement of a variable displacement type hydraulic pump (2), a control valve (26) for controlling the supply and discharge of discharging pressure of the variable displacement type hydraulic pump to and from the cylinder, a fixed displacement type hydraulic pump (3) driven together with the variable displacement type hydraulic pump by the same engine (1), and a throttle valve (18) provided along a discharge line of the fixed displacement type hydraulic pump, wherein the control valve is changed over by virtue of comparison between a differential pressure between the discharge pressure and a loading pressure and a set differential pressure, which is a differential pressure across the throttle valve so as to control the displacement of the variable displacement type hydraulic pump via the cylinder, whereby the differential pressure is made to be a certain value that matches the set differential pressure. <IMAGE>
IPC 1-7
IPC 8 full level
F04B 49/00 (2006.01); F04B 49/08 (2006.01); F15B 11/00 (2006.01); F15B 11/05 (2006.01)
CPC (source: EP)
F04B 49/08 (2013.01); F15B 11/05 (2013.01); F04B 2205/06 (2013.01); F04B 2205/08 (2013.01); F04B 2205/18 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/20538 (2013.01); F15B 2211/20553 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/253 (2013.01); F15B 2211/40507 (2013.01); F15B 2211/50563 (2013.01); F15B 2211/528 (2013.01); F15B 2211/57 (2013.01); F15B 2211/6057 (2013.01); F15B 2211/7135 (2013.01)
Citation (third parties)
Third party :
- JP H0599126 A 19930420 - KOMATSU MFG CO LTD
- JP H05172107 A 19930709 - KOMATSU MFG CO LTD
Designated contracting state (EPC)
DE GB SE
DOCDB simple family (publication)
WO 9632593 A1 19961017; EP 0821167 A1 19980128; EP 0821167 A4 19980902; JP H08338405 A 19961224
DOCDB simple family (application)
JP 9601005 W 19960411; EP 96909349 A 19960411; JP 21473695 A 19950823