EP 1457678 A1 20040915 - Gear pump
Title (en)
Gear pump
Title (de)
Zahnradpumpe
Title (fr)
Pompe à engrenages
Publication
Application
Priority
JP 2003069529 A 20030314
Abstract (en)
A two-stage gear pump has a pump section. The pump section has an internal space (51,52) that is located adjacent to a driven gear and about a cylindrical surface of the driven shaft. A discharge section of a first gear train is connected to a suction section of a second gear train with a communication passage (43). The internal space is connected to the communication passage with a pressure introduction passage (67,72). The pressure of the communication passage is introduced to the internal space by the pressure introduction passage, so that the pressure atmosphere of the internal space is an intermediate pressure atmosphere of the suction pressure and the discharge pressure of the pump section. <IMAGE>
IPC 1-7
IPC 8 full level
F04C 2/08 (2006.01); F04C 2/18 (2006.01); F04C 11/00 (2006.01); F04C 14/24 (2006.01); F04C 15/00 (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 15/0038 (2013.01 - EP US); F04C 2210/20 (2013.01 - EP US); F04C 2210/201 (2013.01 - EP US)
Citation (search report)
- [X] GB 2175956 A 19861210 - BOC GROUP PLC
- [XY] DE 1293599 B 19690424 - BORG WARNER
- [X] GB 643931 A 19500927 - AEROSTYLE LTD, et al
- [YA] US 2003012664 A1 20030116 - MAIER EUGEN [US], et al
- [X] PATENT ABSTRACTS OF JAPAN vol. 1997, no. 05 30 May 1997 (1997-05-30)
Designated contracting state (EPC)
DE NL SE
DOCDB simple family (publication)
EP 1457678 A1 20040915; CN 1299002 C 20070207; CN 1534195 A 20041006; JP 2004278381 A 20041007; US 2004179953 A1 20040916
DOCDB simple family (application)
EP 04005946 A 20040311; CN 200410035232 A 20040312; JP 2003069529 A 20030314; US 79813604 A 20040310