Improved injection device in diesel engines of the common-rail type

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(11)

EP 0 967 388 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	12.03.2003 Bulletin 2003/11

(43)	Date of publication A2:
	29.12.1999 Bulletin 1999/52

(21)	Application number: 99110390.4

(22)	Date of filing: 28.05.1999

(51)	International Patent Classification (IPC)⁷: F02M 63/00, F02M 59/46

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

22.06.1998 IT PN980046

(71)	Applicant: Wärtsilä Italia S.p.A.
	34018 San Dorligo della Valle (Trieste) (IT)

(72)	Inventors:
	Sorgo, Marino 34148 Trieste (IT) Nobile, Marino 34124 Trieste (IT)

(74)	Representative: Giugni, Valter et al
	PROPRIA S.r.l., Via Mazzini 13 33170 Pordenone 33170 Pordenone (IT)

(54)	Improved injection device in diesel engines of the common-rail type

(57) Fuel injector for an internal combustion engine, comprising a valve body (1) provided with an inner housing, a therein sliding plunger (4), in which there are arranged at least a first (11) and a second chamber (12), three distinct conduits (5,6,7) adapted to convey a flow of fuel from a high-pressure source to one of said chambers and a flow of fuel from one of said chambers to the needle valve (51), in which the outer walls of the plunger (4) are slidably adhering to inner walls of said housing so as to prevent fuel from anyhow leaking or seeping between said two chambers through passages between the plunger and said walls.
The outflow section (B) connecting said first conduit (5) with said third conduit (6) within the second chamber (12) is of the same order of magnitude as the outflow section (B) of said needle valve (51) and is further significantly smaller than the outflow section (B) connecting said second conduit (7) within the first chamber (11).

Search report