EP0007724A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fuel injector valve
Assignee: Nissan Motor Co Ltd
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Filing: 1979-07-06
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Granted: —
•
Expires: 1999-07-06
Abstract
Abstract A fuel injector valve (10) comprises a magnetic spherical valve member (28), a non-magnetic valve seat member (30) on which the spherical valve member (28) is seatable, a main magnetic pole member (18c) disposed opposite to the valve seat member (30) to attract the spherical valve member (28), a side magnetic pole member (34) spaced from and between the extreme end of the main magnetic pole member (18c) and the extreme end of the valve seat member (30), and a fuel injection section (36, 38, 40) through which the fuel which has passed the clearance between the valve seat member (30) and the spherical valve member (28) is injected out of the fuel injector valve (<sub>1</sub>0), so that the fuel injector valve is improved in response characteristics, stability and durability to render the injector valve suitable for a so-called single point fuel injection system.
Inventors
- 👤 Masaaki Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:50
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/08; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0632; F02M51/08; Y; Y10; Y10S; Y10S239/00; Y10S239/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
188 words
A fuel injector valve (10) having a fuel chamber (26) to which a fuel is admitted, comprising: a magnetic spherical valve member (28) disposed and movable within the fuel chamber; a non-magnetic valve seat member (30) on which said spherical valve member is seatable, the fuel within the fuel chamber being able to pass through a first clearance betwen said valve seat member and said spherical valve member; a main magnetic pole member (18c) disposed opposite said valve seat member and in close proximity to said spherical valve member, said spherical valve member being able to be attracted to said main magnetic pole member; a side magnetic pole member 34 disposed around said spherical valve member, said side magnetic pole member being spaced from and between the extreme end of the said main magnetic pole member and the extreme end of said valve seat member so that magnetic field formed between said main and side magnetic pole members effectively acts on said spherical valve member; and means (36, 38, 40) through which the fuel which has passed said first clearance is injected out of said fuel injector valve.
Claim 2
Dependent Claim
188 words
A fuel injector valve (10) having a fuel chamber (26) to which a fuel is admitted, comprising: a magnetic spherical valve member (28) disposed and movable within the fuel chamber; a non-magnetic valve seat member (30) on which said spherical valve member is seatable, the fuel within the fuel chamber being able to pass through a first clearance betwen said valve seat member and said spherical valve member; a main magnetic pole member (18c) disposed opposite said valve seat member and in close proximity to said spherical valve member, said spherical valve member being able to be attracted to said main magnetic pole member; a side magnetic pole member 34 disposed around said spherical valve member, said side magnetic pole member being spaced from and between the extreme end of the said main magnetic pole member and the extreme end of said valve seat member so that magnetic field formed between said main and side magnetic pole members effectively acts on said spherical valve member; and means (36, 38, 40) through which the fuel which has passed said first clearance is injected out of said fuel injector valve.
Claim 3
Dependent Claim
55 words
A fuel injector valve as claimed in Claim 1, characterised in that said main magnetic pole member is provided with a fuel inlet passage (22, 24) which is formed through said main magnetic pole member and along the axis of said main magnetic pole member so that said main magnetic pole member is generally cylindrical.
Claim 4
Dependent Claim
69 words
A fuel injector valve as claimed in Claim 2, characterised in that there is.provided a fuel passage (18d, 34a) communicating with said fuel inlet passage and spaced from a second clearance between said spherical valve member and said side magnetic pole member to prevent a large amount of the fuel from said fuel inlet passage to flow through said second clearance, said fuel passage communicating with said first clearance.
Claim 5
Dependent Claim
57 words
A fuel injector valve as claimed in Claim 3, characterised in that said valve seat member is generally cylindrical to form a cylindrical opening along the axis thereof, which cylindrical opening communicates with said first clearance, said valve seat member being so located that the axis thereof is aligned with that of said main magnetic pole member.
Claim 6
Dependent Claim
53 words
A fuel injector valve as claimed in Claim 4, characterised in that said main magnetic pole member and said valve seat member are formed with opposite valve contact surfaces (F 1 , F 2 ) respectively, to which said spherical valve member is contactable and between which said spherical valve member is movable.
Claim 7
Dependent Claim
36 words
A fuel injector valve as claimed in Claim 5, characterised in that each valve contact surface-(F l , F 2 ) of said main magnetic pole member and said valve seat member is of frusto-conical shape.
Claim 8
Dependent Claim
37 words
A fuel injector valve as claimed in Claim 5, characterised in that each valve contact surface (F 1 , F 2 ) of said main magnetic pole member and said valve seat member is of part-spherical shape.
Claim 9
Dependent Claim
54 words
A fuel injector valve as claimed in Claim 5, characterised in that said main magnetic pole member and said valve seat member are so located. that said valve contact surfaces thereof restrict the movement of said spherical valve member so as to prevent said spherical valve member from contacting said side magnetic pole member.
Claim 10
Dependent Claim
78 words
A fuel injector as claimed in Claim 8, characterised in that said main magnetic pole member is provided with openings (18d) formed through the cylindrical wall thereof to communicate said fuel inlet passage with said fuel chamber, and said side magnetic pole member is of annular shape and formed with through-holes (34a) said openings of said main magnetic pole member and said through-holes of said side magnetic pole member constituting said fuel passage spaced from said second clearance.
Claim 11
Dependent Claim
55 words
10 A fuel injector valve as claimed in Claim 5, characterised in that said means through which fuel is injected has a circular mixing chamber (40) which is communicable with said cylindrical opening of said valve seat member, and an air passage (44) communicating with said mixing chamber to supply said mixing chamber with air.
Claim 12
Dependent Claim
42 words
A fuel injector valve as claimed in Claim 10, characterised in that said air passage is straight elongate and so located that the axis thereof lies in the direction of a tangent line relative to the circular wall of said mixing chamber.
Claim 13
Dependent Claim
59 words
A fuel injector valve as claimed in Claim 10, characterised in that said main magnetic pole member is formed at its valve contact surface with a plurality of grooves (52) through which said fuel inlet passage communicates with said fuel chamber even when said spherical valve member positively contacts the valve contact surface of said main magnetic pole member.
Claim 14
Dependent Claim
43 words
A fuel injector valve as claimed in Claim 12, characterised in that each groove (52) is so located that the axis thereof lies in the direction of a tangent line relative to the inner peripheral surface of said cylindrical main magnetic pole member.
Claim 15
Dependent Claim
50 words
A fuel injector valve as claimed in Claim 3, characterised in that means are provided for generating pressure differential between the upstream and downstream sides relative to said valve member so as to bias said valve member toward said valve seat member whenever the fuel flows through said first clearance.
Claim 16
Dependent Claim
47 words
A fuel injector valve as claimed in Claim 8, characterised in that a spring (54) is disposed in said fuel inlet passage to bias said spherical valve member toward said valve seat member, and a spring retainer (56) disposed between said spring and said spherical valve member.
References Cited (Backward Citations)
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