Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1999-05-05
2000-06-20
Shaver, Kevin
Valves and valve actuation
Electrically actuated valve
Including solenoid
F02M 5946
Patent
active
060768029
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fuel injection valve.
BACKGROUND INFORMATION
Numerous fuel injection valves are already known, e.g., those disclosed in European Patent No. 0 348 786 or Unexamined German Patent No. 40 08 118, which have multiple sealing rings, usually designed as O rings, on their outer circumference. The geometric arrangement and position of these sealing rings which are independent parts and are assembled separately depends on the installation conditions on the internal combustion engine and the embodiments of the valves, which may be designed as top feed injectors or as bottom feed injectors, for example. With these conventional fuel injection valves, the seal to be achieved with the sealing rings is with respect to an intake manifold, a cylinder head or receiving sleeves or a fuel rail, a distributor line or the like. Sealing rings are introduced into specially designed mounting spaces, such as ring grooves, on the valve housing, on the nozzle body, on projecting bodies or on the molded plastic sheathing provided on the fuel injection valve.
German Patent No. 195 12 339 describes tube-like sealing elements which may be provided on fuel injection valves with a molded plastic sheathing so that they lie directly on metal parts of the valve at the ends of the molded plastic sheathing. The sealing elements here completely surround the respective metal part of the valve radially and are usually surrounded radially at least partially by the molded plastic sheathing.
SUMMARY OF THE INVENTION
The fuel injection valve according to the present invention has the advantage that an inexpensive as well as reliable and effective seal that can be produced easily is guaranteed for the fuel injection valve toward the outside, e.g., with respect to a fuel rail, a distributor line or an intake manifold or a cylinder head. The seal is provided by sealing elements according to the present invention which are produced in a plastic injection mold before, during or after producing the molded plastic sheathing around the fuel injection valve. With such a mold, a second injection operation takes place advantageously after injection molding of the plastic for the valve jacket, molding the sealing elements on the molded plastic sheathing so that a contact area is formed at least at the surface. A substantively engaged contact is formed in the contact areas of the sealing material of the sealing element with the plastic of the molded plastic sheathing. A very flexible design and spatial arrangement can be achieved in an especially advantageous manner by applying the sealing elements by injection.
It is advantageous that it is possible to vary in a very simple manner the number of sides of the sealing element to have surface contact with the molded plastic sheathing. A one-sided surface contact can be achieved at one end of the molded plastic sheathing, a two-sided surface contact can be achieved at a stepped section of the molded plastic sheathing, and a three-sided surface contact can be achieved in annular grooves on the outer circumference of the molded plastic sheathing.
The advantage of a very great variability of the installed position with one and the same valve is achieved with the arrangement of sealing elements in the middle axial areas of the fuel injection valve.
The thicknesses and widths (axial dimensions) of the sealing elements can be varied easily in an advantageous manner. In addition, a great variety of shapes can be produced easily, with convex, rounded or flat outside contours and contours provided with sealing lips or sealing ribs being advantageous.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a fuel injection valve with various sealing elements according to the present invention.
FIG. 2 shows a sealing element with several sealing lips.
DETAILED DESCRIPTION
The fuel injection valve according to the present invention, illustrated in FIG. 1 as an example in a partially simplified form, for fuel injection systems of internal combustion engines with spark i
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patent: 5632467 (1997-05-01), Just et al.
patent: 5718206 (1998-02-01), Sawada et al.
patent: 5860632 (1999-01-01), Buth et al.
patent: 5887851 (1999-03-01), Trzmiel
Keasel Eric
Robert & Bosch GmbH
Shaver Kevin
LandOfFree
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