Fuel injection valve for internal combustion engines

Details Fuel injection valve for internal combustion engines Fuel injection valve for internal combustion engines

1999-09-20

2001-10-16

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S468000

Reexamination Certificate

active

06302087

ABSTRACT:

PRIOR ART
The invention is based on a fuel injection valve for internal combustion engine. In one such fuel injection valve, known from European Patent Disclosure EP B1 0 304 747, the insert has a peglike part, which is inserted into a suitable blind bore of the housing of the fuel injection valve and with its face end closes a guide bore, inside of the guide bore a tappet is guided that acts on the other end on the injection valve needle. In the known version, the control pressure chamber is accommodated in an axial bore of the insert and communicates, via a throttle, with a further control chamber portion located immediately above the tappet in the guide bore. Between the insert and the tappet, an insert receiving this throttle is provided. The stroke of the tappet can be adjusted by varying the thickness of the insert.
The magnet valve in this version has a magnet valve housing with an axially protruding apron, by way of which the insert is held in its position on the housing of the fuel injection valve. The armature of the magnet valve is guided along the inside circumference of the apron and is located in principal between the upper end of the insert and the core of the electromagnet that actuates the armature. This version entails a major effort to adjust the stroke of the valve member of the magnet valve. It involves the risk that if the armature comes into direct contact with the associated core of the electromagnet, magnetic sticking can disadvantageously occur, which considerably impairs the functioning, and particularly the switching speed of the magnet valve.
ADVANTAGES OF THE INVENTION
By means of the fuel injection valve of the invention as defined hereinafter, a compact design with considerable advantages in terms of production and assembly is attained. Because the insert now receives not only the guide for the valve member of the magnet valve but also the cylinder with the movable wall that encloses the control pressure chamber, a single production unit is created which is easy to make and easy to assemble. It is in particular highly advantageous that the armature is embodied as a flat armature and is adjustable in a cup-shaped recess of the insert, with one rim of the insert protruding past the armature located in the closing position and ending directly in the plane that defines the final stroke position of the armature. Thus, an association of the electromagnet of the magnet valve with the valve seat disposed in the insert can be established in a simple way, and this association can be adjusted exactly by simply reworking the height of the rim of the insert. In a very simple way, it, is then possible by placing a shim between the rim of the insert and the housing or the core of the electromagnet, to define a residual air gap; upon excitation of the electromagnet, the armature moves with its rim into contact with the shim that defines its stroke toward the magnet, specifically in a narrow surface region in the rim region of the outer circumference of the armature. It is thus assured that when the excitation of the electromagnet is turned off, and under the influence of a closing spring, the armature quickly and securely returns the valve closing member to the closing position.


REFERENCES:
patent: 4251051 (1981-02-01), Quenneville et al.
patent: 4516730 (1985-05-01), Fiissner
patent: 4946106 (1990-08-01), Turchi et al.
patent: 5088647 (1992-02-01), Yoshida et al.
patent: 5464156 (1995-11-01), Ricco et al.

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