Electromagnetic valve-controlled fuel injection pump for...

Details Electromagnetic valve-controlled fuel injection pump for... Electromagnetic valve-controlled fuel injection pump for...

2005-04-26

2005-04-26

Freay, Charles G. (Department: 3746)

Pumps

With condition responsive pumped fluid control

Expansible chamber pump distributor operation modified

C417S440000, C417S505000, C123S499000, C251S337000

Reexamination Certificate

active

06884041

ABSTRACT:
A solenoid-valve-controlled fuel-injection pump for internal combustion engines, in particular diesel engines, has a solenoid valve, whose valve needle separates a high-pressure region from a low-pressure region, i.e. connects the high-pressure region and low-pressure region, in the pump housing, via a valve seat; the injection period being controlled by the opening of the solenoid valve. In addition, a low-pressure compensating piston situated in the low-pressure region is provided in order to compensate for pressure fluctuations in the low-pressure region. The exceptional feature is that the low-pressure compensating piston, which is positioned coaxially to the solenoid-valve needle, takes the form of a component part that is separate from the solenoid-valve needle. This ensures that the solenoid valve is opened unhindered and as rapidly as possible by the opening force exerted on the solenoid-valve needle by the electromagnet.

REFERENCES:
patent: 5318001 (1994-06-01), Djordjevic
patent: 5582153 (1996-12-01), Dutt et al.
patent: 5700139 (1997-12-01), Rodriguez-Amaya
patent: 6059545 (2000-05-01), Straub et al.
patent: 6280160 (2001-08-01), Nothdurft et al.
patent: 43 39 948 (1995-06-01), None
patent: WO 95 14857 (1995-06-01), None
patent: WO 97 40272 (1997-10-01), None
patent: WO 98 49441 (1998-11-01), None

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