EP 1806504 A1 20070711 - NO-LOAD OPERATION SYSTEM OF TADEM PUMP
Title (en)
NO-LOAD OPERATION SYSTEM OF TADEM PUMP
Title (de)
LEERLAUFBETRIEBSSYSTEM FÜR TANDEMPUMPE
Title (fr)
SYSTEME DE FONCTIONNMENT A VIDE D'UNE POMPE TADEM
Publication
Application
Priority
- JP 2005014610 W 20050803
- JP 2004274855 A 20040922
Abstract (en)
When the pressure in the main oil supply channel 9 is lower than the no-load operation start pressure, the pressurized oil within the secondary oil supply channel 10 passes through the internal flow channel 21 of the spool 20 and flows into the main oil supply channel 9. At this time oil output from both the main and secondary oil pumps 7, 8 is merged and supplied to the oil supply destination OB. When the pressure within the main oil supply channel 9 rises and reaches the no-load operation start pressure, the spool 20 moves in opposite direction to the direction of the force of the spring 30, the pressurized oil within the secondary oil supply channel 10 is drained, the poppet 40 contacts the spool 20 and blocks the internal flow channel 21 of the spool 20. At this time, the secondary oil pump 8 enters the no-load operation state, and oil output from the main oil pump 7 only is transmitted to the oil supply destination OB.
IPC 8 full level
F04C 14/06 (2006.01); F04B 23/04 (2006.01); F04C 14/02 (2006.01)
CPC (source: EP US)
F04B 23/04 (2013.01 - EP US); F04C 14/065 (2013.01 - EP US); F04C 14/26 (2013.01 - EP US); F04C 2270/56 (2013.01 - EP US)
Citation (search report)
See references of WO 2006033207A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1806504 A1 20070711; CN 100419267 C 20080917; CN 101027485 A 20070829; JP WO2006033207 A1 20080515; US 2008107545 A1 20080508; WO 2006033207 A1 20060330
DOCDB simple family (application)
EP 05770828 A 20050803; CN 200580031960 A 20050803; JP 2005014610 W 20050803; JP 2006536326 A 20050803; US 57482705 A 20050803