EP0483770A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Perfected high pressure sealing system for the control valve of an electromagnetic internal combustion engine fuel injector
Assignee: Elasis SCpA
•
Filing: 1991-10-29
•
Granted: —
•
Expires: 2011-10-29
Abstract
Abstract The body (38) of a control valve (19) is housed inside the hollow body (11) of an injector (10) by means of a fluidtight connection comprising a pair of precision ground mating surfaces (70, 72), and a sealing ring (75, 80) compressed between a further two surfaces (40, 73; 78, 76) of the bodies (11, 38) adjacent to the aforementioned pair of surfaces (70, 72). The ring (75) may be made of rubber, may be fitted between two cylindrical surfaces (40, 73), and is also pressed by the fuel on to a shoulder (74) of the valve body (38). Alternatively, the ring may consist of a soft iron washer (80) pressed axially between a flange (42) on the valve body (38) and a surface (78) of the hollow body (11).
Inventors
- 👤 Sisto Luigi De Matthaeis
- 👤 Mario Ricco
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:33
CPC Classifications
F; F02; F02M; F02M47/00; F02M47/02; F02M47/027; Y; Y10; Y10S; Y10S239/00; Y10S239/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
An electromagnetic internal combustion engine fuel injector comprising a hollow body (11) with an injection nozzle (12) and a control valve (19) for opening said nozzle (12), and wherein said valve (19) comprises a valve body (38) having a hole (49) connecting a control chamber (47) to a drain conduit (33), said valve body (38) being housed in said hollow body (11) via fluidtight connecting means; characterised by the fact that said connecting means comprise a pair of mating surfaces (70, 72), on said bodies (38, 11), machined to a high degree of precision for achieving minimum clearance; and a sealing ring (75, 80) compressed between a further two substantially parallel surfaces (73, 40; 76, 78) of said bodies (38, 11), adjacent to said pair of surfaces (70, 72).
Claim 2
Dependent Claim
28 words
An injector as claimed in Claim 1, characterised by the fact that each said mating surface (70, 72) is cylindrical, and said clearance is less than 0.05 mm.
Claim 3
Dependent Claim
81 words
An injector as claimed in Claim 2, characterised by the fact that said valve body (38) is fitted in said hollow body (11) by means of a threaded ring nut (52) screwed inside a seat (53) on said hollow body (11); a bell-shaped member (51) between said ring nut (52) and said valve body (38) being designed to press on a flange (42) on said valve body (38) in a direction parallel to the axis of said cylindrical surfaces (70, 72).
Claim 4
Dependent Claim
57 words
An injector as claimed in one of the foregoing Claims, characterised by the fact that said further two surfaces (73, 40) are also cylindrical, and that said ring (75) if formed of elastic material; one of said bodies (38, 11) comprising a shoulder (74) for supporting said ring (75) perpendicular to said further two surfaces (73, 40).
Claim 5
Dependent Claim
52 words
An injector as claimed in Claim 4, characterised by the fact that said shoulder (74) is supported on said valve body (38); said ring (75) presenting a substantially round section; and said further two surfaces (73, 40) being spaced so as to deform said ring (75) and produce a substantially rectangular section.
Claim 6
Dependent Claim
28 words
An injector as claimed in Claims 3 and 5, characterised by the fact that said flange (42) also rests on a shoulder (44) of said hollow body (11).
Claim 7
Dependent Claim
43 words
An injector as claimed in one of the foregoing Claims from 1 to 3, characterised by the fact that said further two surfaces (76, 78) are flat and annular; said ring consisting of a washer (80) of deformable metal material, e.g. soft iron.
Claim 8
Dependent Claim
36 words
An injector as claimed in Claims 3 and 7, characterised by the fact that said washer (80) is fitted between said flange (42) and a recess (77) in a shoulder (44) of said hollow body (11).
References Cited (Backward Citations)
FR2543647A1
Cited
EP0304747B1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.