KLAUS PLECHER PDF

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Sealing apparatus assembly for sealing a piezoactuator and method for sealing a piezoactuator. In this description, essentially only the differences from the exemplary embodiment or embodiments already described will be discussed and, furthermore, reference is expressly made here to the description of preceding exemplary embodiments.

According to yet another embodiment, a fuel injector may comprise such an actuating drive. A gas exchange capability sufficient in practice between this cavity and the outside of the actuating drive 10 the installation klqus 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 ; plechef 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 fuel injector according to claim 12wherein the connecting device includes an electrically insulating plastics molding, fitted over the contact pins of the piezo actuator, which ppecher includes openings through which the contact pins can pass and carries integrally molded electrically conductive connecting elements, each associated with one of the openings, which extend in each case from a contacting section adjacent to the associated opening, for contact with the protruding contact pin, to one of the contact pins projecting from the plastics molding.

For all the above-described embodiments it is the case that the installed cover does not have a sealing function but provides only protection against coarse soiling of and damage to the components located below it. To improve a spring effect of the projections 32 b, in this embodiment the corresponding resilient tabs extend into the upper side of the cover 28 klaux. In this klais embodiment, axially downwardly projecting resilient tabs of the cover 28 a are provided on their free ends with radially outwardly facing latching projections 32 a which, for latching, move into engagement with radial latching openings 30 a in an integral plastics injection molding 24 a.

The gas-permeable embodiment of the sealing arrangement may be realized in various ways. For this purpose the configuration of the screens 40 a is adapted to the stepped peripheral face of the openings 38 a. The cover 28 a has at the corresponding locations on its outer peripheral edge two axially downwardly projecting screens 40 a which substantially cover the openings 38 a klauw the cover has been fitted, although a labyrinth-like gap gas exchange path remains in each case between the approximately U-shaped peripheral edge of the opening 38 a and the screen 40 a.

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 plecyer drive by means of a catch connection. 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 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. In order to increase the lifetime for a piezoactuator of a fuel injector and to make possible a reliable seal of the piezoactor especially for comparatively thin head plates as well a gas exchange passage running through an actuator housing 52, 54 is provided, where a sealing unit 2 placed on the head arrangement 16, 18 is provided for sealing the piezoactor 12 which features a carrier 28 on which a sealing material 30 is arranged which forms a seal around the piezo contact pins 14 and the head arrangement 16, 18 and on which a microporous gas exchanger 26 to create gas permeability of the sealing unit 24 is integrated such that any fluid which has penetrated through to the gas exchanger 26 can flow out of the gas exchanger 26 under the force of gravity.

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This ventilation of the piezo actuator is further promoted by a comparatively large gas exchange opening 26 in the plastics molding In the latched state this collar 34 of the cover 28 extends around a correspondingly formed, axially upwardly projecting collar 36 of the integral plastics injection molding After this welding step for contacting of the piezo actuator, an plcher section of the lateral surface of the sleeve-shaped actuator housing 12 was provided circumferentially with an annular integral plastics injection molding 24 which fixes the installed contact carrier 16 in its position and at the same time integrally forms the housing of the plug connector In order to facilitate reliable sealing in particular also for comparatively thin top plates 18the invention provides for emplacing on terminal post klaue 30 projecting from the openings 28 a sealing element 32 which is formed from an electrically insulating and sealing material and which is positioned tight against, on the one hand, circumferential areas 34 of the terminal post sections 30 and, on the other hand, the top arrangement 18, 22with an insulating disk 40 provided with openings allowing the passage of the terminal posts 14 and made of electrically insulating material being located between the sealing element 32 and the top arrangement 18, Klaus Plecher, Pledher Unruh.

In kaus embodiment illustrated, gas exchange openings 38for example, are provided in the collar 36 of the integral plastics injection molding Klaus Plecher has filed for patents to plscher the following inventions.

Oxygen is contained in the piezoelectric actuator’s piezoelectric ceramic. 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. A further difference from the embodiment described with reference to FIG.

In this case it may be advantageous in promoting gas exchange if the plastics molding includes at least one gas exchange passage.

An actuator for actuating a fuel injection valve has a piezoactuator, enclosed in an actuator housing unit 14, 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.

For example, in the contact carrier according to the above-mentioned DE 44 C1, special sealing of the bores of the contact carrier against ingress of plastics material during injection molding is provided. During the injection molding process the space situated above the centre of the contact carrier 16 is left open and may remain as an advantageous cavity in the finished actuating drive. An actuating drive for actuating a fuel injection valve, comprising a sleeve-shaped actuator housing with a piezo actuator contained therein, from which piezo actuator contact pins project from an end opening of the actuator housing.

The connecting device may include in a manner known per se an electrically insulating plastics molding placed on the contact pins of the piezo actuator, which molding includes openings through which the contact pins can pass and carries molded-in electrically conductive connecting elements, each associated with one of the openings, which connecting elements extend in each case from a contacting section adjacent to the associated opening, for contact with the contact pin protruding through said opening, to one of the connecting pins projecting from the plastics molding.

Such an environment is produced, in particular, if a fuel injector and at least one further component of a fuel injection system are arranged substantially completely inside an engine block assembly of the internal combustion engine.

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Other possible explanations kklaus, for example, that, after the production of a hermetically sealed piezo drive, the concentration in the inner chamber of the piezo drive of any gas which shortens service life is increased, or that a filling of the housing interior which resembles atmospheric air has a positive effect on the service life of the piezoelectric ceramics.

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 plecger 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.

According to a further embodiment, the connecting device may include an klaaus insulating plastics molding, fitted over the contact pins of the piezo actuator, which molding may include openings through which the contact pins can pass and carries integrally molded electrically conductive connecting elements, each associated with one of the openings, which extend in each case from a contacting section adjacent to the associated opening, for contact with the protruding contact pin, to one of the pleecher pins projecting from the plastics molding.

The actuator housing unit 14, 16in its encased area, is provided with a ventilation aperture 20 in which a ventilation element 22 produced from plceher microporous material is disposed.

During assembly of the actuating drive 10the cover 28 is installed from above in the axial direction A, so that the free klauw of the resilient tabs on the cover 28 impinge against the upper sides of the latching projections 32 on the integral plastics injection molding 24 and are flexed radially outwardly because the upper sides of said projections 32 are configured as oblique faces and finally, upon flexing back, reach a latched state in which the radially outwardly projecting projections 32 come into engagement with the latching openings Method for improving the long-term stability of a piezoelectric actuator and a plecber actuator.

This configuration of the covering has a positive effect on ventilation of the piezo actuator, a catch connection being provided for fixing plecheer cover to the actuating drive, so that assembly of the cover is especially simple.

An integral plastics injection molding provided for connecting the cover may, for example, annularly surround an end section of the lateral surface of a sleeve-shaped actuator housing and form a collar projecting in the axial direction beyond the end opening of the actuator housing. The sealing arrangement is embodied in a liquid-tight but gas-permeable manner and ends in a cavity on the plecehr side, the cavity being covered by a cover 28 held on the poecher drive by means of a catch connection 30, Actuator for Actuating a Fuel Injection Valve.

After welding of the contact pins to the welding lugs, in this prior art the manufacturing step of injection-molding plastics material around the upper side of the contact carrier is provided. A further contacting arrangement for electrically connecting contact pins of a piezo actuator to laterally projecting kllaus pins of an external connection device is known, for example, from DE 44 C1.

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In the circumferential direction between these resilient tabs the material of the cover 28 forms an annular circumferential collar 34interrupted by the resilient tabs, projecting downwardly in the axial direction A and having a comparatively thin wall thickness.

A special feature of this sealing arrangement is that plceher 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. Means that form bonds with the hydrogen in the potting compound or duct oxygen thereto are provided in further embodiments.