EP0484804A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved high pressure plunger system for the control valve of an electromagnetic internal combustion engine fuel injector
Assignee: Elasis SCpA
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Filing: 1991-10-29
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Granted: —
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Expires: 2011-10-29
Abstract
Abstract The control valve (19) of an injector (10) comprises a plunger (67) and a valve body (38) having an axial control chamber (47) connected to a drain conduit (33) via a hole (49). The hole (49) terminates at a flat surface (68) of the valve body (38), which surface (68) is perpendicular to the operating direction of the actuator (37) of the plunger (67). The plunger (67) consists of a pad element having a flat face (70) engaging the surface (68) of the valve body (38), while the opposite face (71) may be flat or spherical, and is engaged by a complementary surface (72) on the end of the actuator (37).
Inventors
- 👤 Mario Ricco
- 👤 Sisto Luigi De Matthaeis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 20:09
CPC Classifications
F; F02; F02M; F02M63/00; F02M63/0012; F02M63/0031; F02M63/0033; F02M47/00; F02M47/02; F02M47/027; F02M63/0014; F02M63/0015; F02M63/0017
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
149 words
An electromagnetic internal combustion engine fuel injector comprising a hollow body (11) with a normally-closed nozzle (12) which is opened for injecting fuel into the engine; a member (38) fitted inside said hollow body (11) and having a control chamber (47); and a control valve comprising a hole (49) connecting said chamber (47) to a drain conduit (33), and a plunger (67) controlled by the anchor (28) of an electromagnet (20) for opening said nozzle (12); said chamber (47) normally communicating with the pressurized fuel; characterised by the fact that said hole (49) terminates at a flat surface (68) of said member (38); said plunger consisting of a pad element (67) having a flat face (70) mating with said surface (68); said anchor (28) presenting an actuator (37) for engaging the opposite face (71, 73, 77) of said pad element (67) via displacement substantially perpendicular to said surface (68).
Claim 2
Dependent Claim
50 words
An injector as claimed in Claim 1, characterised by the fact that said actuator is in the form of a stem (37) integral with said anchor (28); said opposite face (71, 73, 77) being engaged by a spherical surface (72, 75, 78) on the free end of said stem (37).
Claim 3
Dependent Claim
49 words
An injector as claimed in Claim 2, characterised by the fact that said member consists of a valve body (38) having said flat surface (68); said valve body (38) being sealed inside said hollow body (11) by means of a threaded ring nut (52) and a bell-shaped member (51).
Claim 4
Dependent Claim
41 words
An injector as claimed in Claim 3, characterised by the fact that said stem (37) is guided by a sleeve (54) on said bell-shaped member (51); said pad element (67) moving inside a seat (66) formed in said bell-shaped member (51).
Claim 5
Dependent Claim
38 words
An injector as claimed in one of the foregoing Claims from 2 to 4, characterised by the fact that said opposite face (71) is also flat, and is engaged by a spherical-cap-shaped surface (72) on said free end.
Claim 6
Dependent Claim
38 words
An injector as claimed in one of the foregoing Claims from 2 to 4, characterised by the fact that said opposite face (73) and the spherical surface (72, 78) on said free end are respectively concave and cap-shaped.
Claim 7
Dependent Claim
38 words
An injector as claimed in Claim 6, characterised by the fact that said cap-shaped surface (75) is on said free end; said opposite face (73) being concave with a radius slightly larger than that of said cap (75).
Claim 8
Dependent Claim
55 words
An injector as claimed in Claim 7, characterised by the fact that said cap-shaped surface (75) is on said free end and flat-spherical in shape; said concave surface being located on said opposite face (73) and being flat-concave in shape, the concave portion having a slightly larger radius than the sphere of said cap (75).
Claim 9
Dependent Claim
43 words
An injector as claimed in Claim 6, characterised by the fact that said pad element (67) consists of a spherical cap (77) formed by faceting a sphere to produce said flat face (68); said concave surface (78) being located on said free end.
Claim 10
Dependent Claim
30 words
An injector as claimed in Claim 9, characterised by the fact that said spherical cap (77) consists of a sphere portion greater than or equal to half of the sphere.
Claim 11
Dependent Claim
55 words
An injector as claimed in one of the foregoing Claims from 2 to 4, characterised by the fact that the surface of said opposite face (73) and the surface (78) of said stem (37) are both flat-concave in shape; a ball (80) being inserted between the concave portions of said two flat-concave surfaces (73, 78).
Claim 12
Dependent Claim
29 words
An injector as claimed in Claim 11, characterised by the fact that each flat-concave surface (73, 78) comprises a spherical portion slightly larger in diameter than said sphere (80).
Claim 13
Dependent Claim
35 words
An injector as claimed in one of the foregoing Claims, characterised by the fact that said pad element (67) is substantially polygonal, and comprises a series of alternating flat portions (82) and round portions (81).
References Cited (Backward Citations)
EP0196265A2
Cited
GB2182756A
Cited
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