Global Patent Index - EP 2022985 A2

EP 2022985 A2 2009-02-11 - 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

EP 2022985 A2 (EN)

Application

EP 08014138 A

Priority

  • JP 2007207331 A
  • JP 2008030926 A

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 (invention and additional information)

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 (invention and additional information)

F04C 11/001 (2013.01); F04C 2/086 (2013.01); F04C 2/18 (2013.01); F04C 14/065 (2013.01); F04C 14/26 (2013.01); F04C 2240/30 (2013.01)

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

EPO simple patent family

EP 2022985 A2 20090211; US 2009041593 A1 20090212

INPADOC legal status


2010-05-05 [18W] APPLICATION WITHDRAWN

- Effective date: 20100331

2009-02-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20080807

2009-02-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): 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

2009-02-11 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL BA MK RS