Fluid sprinkling – spraying – and diffusing – Processes – Of fuel injection
Reexamination Certificate
1999-12-23
2001-05-08
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Processes
Of fuel injection
C239S585100
Reexamination Certificate
active
06227457
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates in general to valve assemblies, and, in particular, fuel injectors having a swirl generator. More particularly to high-pressure, direct-injection fuel injectors required to meter accurate and repeatable amounts of fuel for any given injection pulse.
SUMMARY OF THE INVENTION
The present invention provides a fuel injector having a housing, an armature, and an inlet member, and a needle. The housing has a fuel inlet, a fuel outlet, and a fuel passageway extending from the fuel inlet to the fuel outlet along a longitudinal axis. The inlet member and the armature is disposed within the fuel passageway. The needle is operatively connected to the armature, and is positionable to permit or inhibit fuel flow through the fuel outlet.
A first surface is located on one of the inlet member and the armature. The first surface has a first perimeter located on a first plane that is substantially perpendicular to the longitudinal axis. A second surface, which is exposed to the first surface, is located on the other of the inlet member and the armature. The second surface has a second perimeter at least partially located on a second plane that is oblique to the longitudinal axis.
In a preferred embodiment, the second surface has an engagement face and a relieved face. The engagement face is located proximate the second perimeter. The engagement face is a planar surface that is substantially perpendicular to the longitudinal axis. The relieved face, preferably, is a planar surface that is offset along the longitudinal axis and substantially parallel to the planar surface of the engagement face, or a planar surface that is oblique to the longitudinal axis.
The present invention also provides a method of mechanically enhancing motion of components of a fuel injector. The fuel injector includes a housing, an inlet member, an armature and needle assembly, a first support member, and a second support member. The housing has a fuel inlet, a fuel outlet, and a fuel passageway extending from the fuel inlet to the fuel outlet along a longitudinal axis. The inlet member provides the fuel inlet of the housing. The armature and needle assembly is disposed within the passageway, and has a central axis substantially aligned with the longitudinal axis. The first support member is provided for the armature, and the second support member is provide for the needle. The method of the present invention is achieved by providing a first surface on one of the inlet member and the armature; providing a second surface on the other of the inlet member and the armature; and engaging the first surface and the second surface so that the central axis is at least partially offset from the longitudinal axis of the fuel injector.
In a preferred embodiment of the method, an engagement face and a relieved face is arranged on the second surface. The engagement face is a planar surface that is substantially perpendicular to the central axis, and the relieved face is either a planar surface that is offset along the longitudinal axis and is substantially parallel to the planar surface of the engagement face or, a planar surface that is oblique to the longitudinal axis. Preferably, the first surface is located on the inlet member and the second surface is located on the armature, an armature guide eyelet is provided as the first support member, and the at least one flat guide disk is provided as the second support member.
REFERENCES:
patent: 5033716 (1991-07-01), Mesenich
patent: 5375772 (1994-12-01), Cristiani et al.
patent: 5427319 (1995-06-01), Bata
patent: 6065692 (2000-05-01), Brinn, Jr.
Kim Christopher S.
Scherbel David A.
Siemens Automotive Corporation
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