EP 2022985 A2 20090211 - Valiable displacement type gear pump
Title (en)
Valiable displacement type gear pump
Title (de)
Zahnradpumpe mit variabler Verdrängung
Title (fr)
Pompe à engrenage de type à déplacement variable
Publication
Application
Priority
- JP 2007207331 A 20070809
- JP 2008030926 A 20080212
Abstract (en)
A variable displacement type gear pump has gear chambers, one of which is a specific gear chamber. A suction passage (35,36,37) is formed in the housing so as to communicate with suction-side spaces (31,33). An outlet passage (41) communicates with discharge-side spaces (32,34). A return passage (50) returns the fluid discharged to the discharge-side space of the specific gear chamber to the suction passage. The return passage communicates with the suction passage at a confluence portion located upstream side of the suction-side space. An opening and closing valve (51) opens the return passage in a small displacement operational state. A check valve (45) is located between the discharge-side space of the specific gear chamber and the outlet passage for preventing the fluid discharged from the gear chamber other than the specific gear chamber from flowing into the discharge-side space of the specific gear chamber in the small displacement operational state.
IPC 8 full level
F04C 2/08 (2006.01); F04C 2/18 (2006.01); F04C 11/00 (2006.01); F04C 14/06 (2006.01); F04C 14/26 (2006.01)
CPC (source: EP US)
F04C 2/086 (2013.01 - EP US); F04C 2/18 (2013.01 - EP US); F04C 11/001 (2013.01 - EP US); F04C 14/065 (2013.01 - EP US); F04C 14/26 (2013.01 - EP US); F04C 2240/30 (2013.01 - EP US)
Citation (applicant)
JP 2002070757 A 20020308 - TOKICO LTD
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
DOCDB simple family (application)
EP 08014138 A 20080807; US 18662508 A 20080806