EP0302637A1
Expired / Lapsed
EP
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Fuel injector
Assignee: ZF International UK Ltd
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Filing: 1988-07-22
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Granted: —
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Expires: 2008-07-22
Abstract
Abstract A fuel injector for supplying liquid fuel to an air inlet manifold of a spark ignition engine has an outlet (15) defined in a tubular component (31) The fuel enters the outlet through an orifice (30) formed in a valve seat member (27). The tubular component is mounted in a tubular part (32) of the injector body and the tubular component is spaced from the valve seat member. An air circulation duct (34) is defined between the component and part and the spray of fuel flowing through the outlet draws air through the duct to minimise dribble of fuel from the injector.
Inventors
- 👤 John W. Kiracofe
- 👤 Randy C. Baxter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:14
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/04; F02M69/047; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0635; F02M51/0639; F02M51/08; F02M61/00; F02M61/16; F02M61/18; F02M61/1853
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A fuel injector for supplying liquid fuel to an air inlet duct of a spark ignition engine comprising a valve seat member (27) defining an annular seating (29) for engagement by a solenoid actuated valve member (24), an orifice (30) through which fuel under pressure can flow when the valve member (24) is lifted from the seating and a tubular outlet (15) through which in use fuel flows from the orifice (30) to the air inlet duct, characterised by an air circulation duct (34) which opens into the outlet (15) at a position adjacent the valve seat member (27) to allow air to be drawn into the outlet (15) by the action of the fuel spray.
Claim 2
Dependent Claim
116 words
A fuel injector for supplying liquid fuel to an air inlet duct of a spark ignition engine comprising a valve seat member (27) defining an annular seating (29) for engagement by a solenoid actuated valve member (24), an orifice (30) through which fuel under pressure can flow when the valve member (24) is lifted from the seating and a tubular outlet (15) through which in use fuel flows from the orifice (30) to the air inlet duct, characterised by an air circulation duct (34) which opens into the outlet (15) at a position adjacent the valve seat member (27) to allow air to be drawn into the outlet (15) by the action of the fuel spray.
Claim 3
Dependent Claim
31 words
A fuel injector according to Claim 1 characterised in that said air circulation duct (34) extends from adjacent the end of the outlet (15) remote from the valve seat member (27).
Claim 4
Dependent Claim
76 words
A fuel injector according to Claim 1 characterised in that the outlet (15) is defined by a tubular component (31) located in a tubular part (32) of the housing of the injector, the end of said tubular component being spaced from said valve seat member (27), said air circulation duct (34) being defined between said tubular component (31) and part (32) said air circulation duct extending to adjacent the outer end of said tubular component (31).
Claim 5
Dependent Claim
36 words
A fuel injector according to Claim 3 characterised in that the outer surface of the end of said tubular component (31) remote from the valve seat member (27) is machined to define a sharp edge (37).
Claim 6
Dependent Claim
30 words
A fuel injector according to Claim 4 characterised in that said air circulation duct (34) is defined by a flat (33) on the exterior surface of said tubular component (31).
Claim 7
Dependent Claim
22 words
A fuel injector according to Claim 5 characterised in that the injector is provided with a plurality of air circulation ducts (34).
Claim 8
Dependent Claim
27 words
A fuel injector according to Claim 3 characterised in that the outlet (15) has a flared entrance (35) at its end adjacent the valve seat member (27).
Claim 9
Dependent Claim
60 words
A fuel injector according to Claim 7 characterised in that the face of the valve seat member (27) presented to the outlet is formed with a recess (28), the injector having a plurality of orifices (30) formed in the base wall of the recess, said orifices being positioned so that a generally conical fuel spray issues from the outlet (15).
References Cited (Backward Citations)
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