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US20080163853A1 – Actuating Drive for Actuating a Fuel Injection Valve – Google Patents
A gas exchange capability sufficient in practice between this cavity and the outside of the actuating drive 10 the installation environment is already ensured by the latching principle described, since larger or smaller gaps always remain between the material of the cover 28 and the integral plastics injection molding 24 ; although these gaps prevent ingress of solid objects into the cavity, they do not prevent gas exchange to the degree which is of interest here.
The sealing arrangement is embodied in a liquid-tight but gas-permeable manner and ends in a pledher on the outer side, the cavity being covered by a cover 28 held on the plechwr drive by means of a catch connection 30, In the embodiment illustrated, gas exchange openings 38for example, are provided in the collar 36 of the integral plastics injection molding In the region koaus the electrical connecting device contact carrier 16 or below same a sealing arrangement for sealing the end opening of the actuator housing 12 against the ingress of liquid media is provided.
According to a further embodiment, the integral plastics injection molding annularly may surround an end section of a lateral face of the sleeve-shaped actuator housing and may form a collar projecting beyond the end opening of the actuator housing in the axial direction.
In this respect, simple final injection-molding of plastics material around the sealing arrangement is counterproductive, since such a covering would as a rule hinder the desired gas exchange.
The outside of the cover may also advantageously be used for inscription, such inscription being possible both before and after installation of the cover, for example, by means of an inscription laser.
In the simplest case, such materials may be used at precisely the locations at which sealing elements for example, sealing rings, etc. DE DEA1 en The actuating drive according to claim 5wherein.
The actuator housing unit 14, 16in its encased area, is provided with a ventilation aperture 20 in which a ventilation element 22 produced from a microporous material is disposed. In this case it may be advantageous in promoting gas exchange if the plastics molding includes at least one gas exchange passage. The actuator cover 20 is laser-welded to the casing 10 in an overlapping area 30 between the actuator cover 20 and the casing A possible explanation of the effective mechanism of the actuator ventilation is that, with sealing of the actuator housing which is as hermetic and, in particular, as gas-tight as possible, under certain operating conditions a partial vacuum is produced in the housing interior for example, by temperature fluctuationsas a result of which harmful media can enter the housing interior through the seal which, in practice, cannot be embodied absolutely hermetically.
Guide ramps to facilitate snapping-in are provided on the upper edges of the openings 30 a of the collar 24 b on the inner side of the collar 24 b. In this respect, latching is superior to, for example, ultrasound welding between cover and housing arrangement, which is possible in principle. The housing unit has a cylindrical actuator housing 14 which is elongate in its axial direction A and at least partially encased by an extruded plastic coat.
Klaus Plecher – Google+
Plecer actuating drive according to claim 3wherein. The labyrinth-like configuration of the outer ventilation passage formed in cooperation with the screens 40 a reliably prevents ingress of solid objects into the interior of the cover.
A special feature of this sealing arrangement is that it is embodied in a gas-permeable manner and therefore makes possible a gas exchange between the installation environment of the fuel injector and the actuator space in which the piezo actuator is contained. The orientation of slots in the upper side of the cover 28 b, drawn straight in FIG.
A method is described for improving the long-term stability of a piezoelectric actuator encased in a potting compound containing or forming hydrogen atoms.
If the cover is installed for latching substantially in the axial direction of the actuating drive, radial latching projections or latching openings are especially appropriate.
In addition, in this embodiment a peripheral collar 34 c projecting comparatively little in the axial direction is provided on the cover 28 c, which collar 34 c does not rest against the collar 36 c inside or radially outside the latter, but comes into engagement with a corresponding groove in the upper side of the collar 36 c when the cover 28 c is fitted.
Only the housing of the plug connector 18 can be seen in the Figure, which housing contains the required external connection pins which extend as electrically conductive elements through a plastics molding 20 of the contact carrier 16up to contacting sections in the form of welding lugs 22to which the contact pins 14 have been welded after installation of the contact carrier A disadvantage of the known covering by means of injection-molding, however, is that the actuating drive components covered by the injection-molded plastics material frequently have to be configured in a special way with increased complexity and cost.
The present invention relates to an actuating drive and to a fuel injector formed therewith. The contact carrier 16 serves as a connecting device for the further electrical connection of the contact pins 14 of the piezo actuator to connection pins of a plug connector To this end it is provided that the sealing arrangement is embodied in a liquid-tight but gas-permeable manner and opens on the outside into a cavity which is covered by a cover retained on the actuating drive by means of a catch connection.
When the cover 28 a is fitted, the collar 34 a of the cover therefore overlaps the housing collar 36 a on the inner side thereof. Appropriate means are employed so that unsaturated bonds of the hydrogen in the potting compound will release less oxygen from the piezoelectric ceramic. A sealing arrangement of a piezoelectric actuator comprises terminal posts 14 projecting from the piezoelectric actuator and a metallic top arrangement 18, 22provided with openings 28 allowing the passage of the terminal posts 14 which is emplaced on the piezoelectric actuator.
The actuating drive according to claim 7wherein. Actuator for a fuel injector of an internal combustion engine.
In this prior art a fuel-resistant sealing ring O-ring is inserted in openings of a head plate placed on the piezo actuator in order to create a permanent, in particular oil-tight, seal between a piezo actuator and an external terminal.
An actuating drive of this type is known, for example, from DE 51 A1.
Method for positioning the actuating drive in a fuel injector device for implementing plwcher method. The actuating drive 10 comprises a sleeve-shaped metal actuator housing 12 with a piezoelectric actuator abbreviation: