EP0186323A2
Expired / Lapsed
EP
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Electromagnetic fuel injector
Assignee: Motors Liquidation Co
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Filing: 1985-11-28
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Granted: —
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Expires: 2005-11-28
Abstract
Abstract An electromagnetic fuel injector (10) is provided with a tapered armature valve plate (70) operatively positioned by means of a retainer (80) so that it is arranged so as to, in effect, pivot from a spring (85) biased position at which it seats against a valve seat (30) associated with a plurality of orifice discharge passages (33) located concentrically about the axis of the injector to a second position adjacent to the working surface of the pole piece means (41, 45) of the associate solenoid assembly (40). Preferably, the electromagnetic fuel injector is of the bottom feed type whereby it can be suppled with fuel in excess of the amount to be injected, with the flow path of fuel being arranged so that the excess fuel will purge vapours from the injector and cool the solenoid coil (43) therein.
Inventors
- 👤 Ernest Richmond Stettner
- 👤 Donald Dibble Stoltman
- 👤 Kenneth Peter Cianfichi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 15:04
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0635; F02M51/0639; F02M51/08; F02M53/00; F02M53/04; F02M2700/00; F02M2700/07; F02M2700/077
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
394 words
An electromagnetic fuel injector (10,10')for supplying fuel to a cylinder of an internal combustion engine, the electromagnetic fuel injector including a housing (11,11') having a bore extending axially therethrough; a valve seat orifice plate (20) fixed in the bore of the housing adjacent one end thereof to partly enclose said one end, the valve seat orifice plate having an inboard surface (26) defining a surface of a valve seat (30), an opposed outboard surface (21), and an orifice passage means (33) extending therethrough located concentrically with the axis of the housing; a spacer ring (42,42') positioned in the housing in abutment on one side thereof against the valve seat orifice plate; a solenoid assembly (40,40') fixed in the housing, the solenoid assembly including a pole piece means (41,45,41',45') with a working surface at right angles to the axis of the housing and positioned in axial spaced apart opposed relationship to the surface of the valve seat by the spacer ring whereby to define a fuel cavity (53) therewith; a fuel supply (18,102) operatively associated with the housing and the pole piece means and having one end thereof connectable to a source of fuel and having its other end in flow communication with the fuel cavity; a tapered armature valve plate (70) operatively positioned in the fuel cavity asymmetrical to the axis of'the housing for movement between the working surface of the pole piece means and the surface of the valve seat; a spring (85) operatively associated with the tapered armature valve plate to normally bias the tapered armature valve plate into seating engagement with the surface of the valve seat; characterised in that the tapered armature valve plate (70) presents a working surface (75) inclined at an angle to the axis of the housing (11,11') whereby the axial movement of the tapered armature valve plate between the surface of the valve seat (30) and the working surface of the pole piece means (41,45,41',45') is greater adjacent to the orifice passage means (33) than at a location radially opposite thereof; and a retainer (80,80') operatively fixed to the tapered armature valve plate and operative within the spacer ring (42,42') whereby to prevent radial and lateral motion of the tapered armature valve plate within the spacer ring so as to maintain the tapered armature valve plate in operative relationship to the surface of the valve seat.
Claim 2
Dependent Claim
394 words
An electromagnetic fuel injector (10,10')for supplying fuel to a cylinder of an internal combustion engine, the electromagnetic fuel injector including a housing (11,11') having a bore extending axially therethrough; a valve seat orifice plate (20) fixed in the bore of the housing adjacent one end thereof to partly enclose said one end, the valve seat orifice plate having an inboard surface (26) defining a surface of a valve seat (30), an opposed outboard surface (21), and an orifice passage means (33) extending therethrough located concentrically with the axis of the housing; a spacer ring (42,42') positioned in the housing in abutment on one side thereof against the valve seat orifice plate; a solenoid assembly (40,40') fixed in the housing, the solenoid assembly including a pole piece means (41,45,41',45') with a working surface at right angles to the axis of the housing and positioned in axial spaced apart opposed relationship to the surface of the valve seat by the spacer ring whereby to define a fuel cavity (53) therewith; a fuel supply (18,102) operatively associated with the housing and the pole piece means and having one end thereof connectable to a source of fuel and having its other end in flow communication with the fuel cavity; a tapered armature valve plate (70) operatively positioned in the fuel cavity asymmetrical to the axis of'the housing for movement between the working surface of the pole piece means and the surface of the valve seat; a spring (85) operatively associated with the tapered armature valve plate to normally bias the tapered armature valve plate into seating engagement with the surface of the valve seat; characterised in that the tapered armature valve plate (70) presents a working surface (75) inclined at an angle to the axis of the housing (11,11') whereby the axial movement of the tapered armature valve plate between the surface of the valve seat (30) and the working surface of the pole piece means (41,45,41',45') is greater adjacent to the orifice passage means (33) than at a location radially opposite thereof; and a retainer (80,80') operatively fixed to the tapered armature valve plate and operative within the spacer ring (42,42') whereby to prevent radial and lateral motion of the tapered armature valve plate within the spacer ring so as to maintain the tapered armature valve plate in operative relationship to the surface of the valve seat.
Claim 3
Dependent Claim
68 words
An electromagnetic fuel injector as claimed in claim 1, characterised in that the electromagnetic fuel injector (10,10') further comprises a fuel drain (18a,105) operatively associated with the housing (11,11') and the pole piece means (41,45,41',45'),axially spaced apart from the fuel supply (18,102) and having one end thereof in flow communication with the fuel cavity (53) and having its other end connectable to a source of low pressure fuel.
Claim 4
Dependent Claim
105 words
An electromagnetic fuel injector as claimed in claim 2, characterised in that the pole piece means (41,45,41',45') comprises a cup-shaped outer pole piece (41,41') and an inner pole piece (45,45') defining the working surface at right angles to the axis of the housing (11,11'); the fuel supply (18,102) operatively associated with the cup-shaped outer pole piece for effecting flow communication with the fuel cavity (53); the fuel drain (18a,105) operatively associated with the cup-shaped outer pole piece for effecting flow communication with the fuel cavity; and the retainer (80) is fixed in operative engagement against opposite sides (73) of the tapered armature valve plate (70).
References Cited (Backward Citations)
No citation records indexed.
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