Fuel injector

Details Fuel injector Fuel injector

1999-05-26

2001-05-01

Scherbel, David A. (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

C239S533200, C239S533900, C239S533110, C239S088000

Reexamination Certificate

active

06224001

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a fuel injector for use in supplying fuel to a combustion space of a compression ignition internal combustion engine. In particular, the invention relates to an injector of the outwardly opening type which can be controlled using an electronic control arrangement. Such an injector is suitable for use in, for example, a common rail type fuel system.
SUMMARY OF THE INVENTION
According to the present invention there is provided an outwardly opening fuel injector comprising a valve needle movable within a bore and engageable with a seating to control the supply of fuel from the bore, the needle being moveable outwardly of the bore to move the needle away from its seating, the needle being biased towards its seating by a spring, the spring engaging a spring abutment arrangement associated with a part of the needle remote from the part thereof engageable with the seating, the spring abutment arrangement further acting to guide movement of the needle.
The spring abutment arrangement may comprise a spring abutment member carried by the part of the needle remote from the part thereof engageable with the seating.
The spring abutment member conveniently takes the form of a sleeve which surrounds part of the needle. The sleeve may be in screw threaded engagement with the needle, or alternatively may be secured thereto by welding, using a spring clip, or using any other suitable technique.
The spring abutment member may be arranged to guide movement of the needle by engaging part of the wall of the bore within which the needle is located. Alternatively, the spring abutment member may be arranged to engage the wall of a second bore formed in a separate member, the second bore extending coaxially with the bore within which the needle is located.
The injector conveniently further comprises a piezo-electric actuator arrangement. The piezo-electric actuator arrangement may comprise an actuator arranged to move a piston to control the fluid pressure within a control chamber, part of the needle being exposed to the fluid pressure within the control chamber.
The spring abutment arrangement may, alternatively, comprise a guide region arranged to guide the needle for sliding movement, a fixing region for securing the guide region to the needle and an abutment region arranged to engage the spring, the guide region transmitting the spring load from the abutment region to the fixing region. Two of the regions may, if desired, be integral with one another.
The guide region may be slidable within a bore formed in a sleeve located with a nozzle body.
The invention will further be described, by way of example, with reference to the accompanying drawings, in which:


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patent: 19548526A (1997-07-01), None
patent: 2339451 (2000-01-01), None

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