Fuel injection valve and method of producing the same

Details Fuel injection valve and method of producing the same Fuel injection valve and method of producing the same

1998-03-18

2000-01-11

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

2395851, 2395333, 2395339, B05B 130

Patent

active

060126558

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a fuel injection valve and a process for manufacturing a fuel injection valve, in particular a fuel injection valve that can be assembled economically in a simple manner.
An electromagnetically actuated fuel injection valve is already known from U.S. Pat. No. 4,946,107, which among other things has a non-magnetic sleeve as a connecting part between a core and a valve seat body. The sleeve is connected at both axial ends to the core and to the valve seat body. The sleeve has a constant outer diameter and a constant inner diameter over its entire axial length. The core and the valve seat body are designed with an outer diameter such that they extend into the sleeve at both ends so that the sleeve completely surrounds the two components, core and valve seat body, in these areas. In the inside of the sleeve, in the axial direction, a valve needle moves with an armature that is guided through the sleeve. The fixed connections of the sleeve with the core and the valve seat body are accomplished, e.g., by means of welding. The core and non-magnetic sleeve, together, delimit toward the outside an inner valve part, which is manufactured and adjusted separately and later forms the inside of the fuel injection valve. This inner valve part is ultimately surrounded by several other individual components in the assembled injection valve; at least one pot-shaped housing part, a solenoid with coil body, a cup-shaped coil housing and a connector part are needed. The arrangement and design of the many individual parts that surround the valve part are relatively complex. In addition, a number of connections must be made between the individual outer parts and the inner valve part.
A fuel injection valve is also known from German Patent No. DE 43 10 819, which has a non-magnetic, thin-walled sleeve as a valve seat holder. The entire, completely adjusted fuel injection valve, including the sleeve, is largely surrounded by a plastic injection-molded piece that extends outward from the core in the axial direction over the solenoid to the downstream end of the injection valve. The deep-drawn sleeve has only a very small wall thickness (<0.3 mm) in order to transfer the magnetic flux with as little loss as possible over the non-magnetic sleeve. To coat the injection valve with plastic, high extrusion-coating pressures (up to 350 bar) are required which can lead to deformation of the sleeve, causing assembly and function problems in the injection valve.


SUMMARY OF THE INVENTION

The fuel present injection valve according to the invention can be assembled economically in a simple manner. According to the present invention, this simplified assembly of the fuel injection valve is achieved in that two main components of the injection valve, a valve part and a plastic part, are manufactured and adjusted separately from each other. The inner valve part is designed in an advantageous manner with, among other things, a non-magnetic, thin-walled sleeve, the use of which affords cost savings compared to known valves based on material savings and the joining for connection of individual components can be partially eliminated. Additionally, it is advantageous that the outer plastic part has an inner opening into which the valve part can very easily be placed and fastened simply and yet securely with a holding connection.
Because of this separation into two main components, there is the special advantage that all the negative influences in the manufacturing of the plastic coating (e.g., high extrusion-coating pressures, development of heat) can be kept away from the valve components that carry out the important valve functions. This reliably prevents deformation of the thin-walled sleeve of the valve part by the extrusion-coating pressure. The relatively dirty injection process can take place, outside the assembly line for the valve part.
According to the present invention, the holding connection is produced by engagement, latching or clipping of a holding element on the plastic part

REFERENCES:
patent: 4944486 (1990-07-01), Babitzka
patent: 4946107 (1990-08-01), Hunt
patent: 5046472 (1991-09-01), Linder
patent: 5769391 (1998-06-01), Noller et al.
patent: 5775599 (1998-07-01), Smith et al.

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