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It is therefore further provided according to an embodiment that the sealing arrangement opens on the outside into a cavity which is covered by a cover. 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.
The cover 28 is retained by this latching on the actuating drive 10the aforementioned cavity remaining between the cover 28 and the upper side of the contact carrier Sealing arrangement for a piezoelectric actuator for a fuel injection valve of an internal combustion engine. Although a final, complete encapsulation of the contact carrier 16 with injection-molded plastics material is dispensed with in the actuating drive 10 represented, the contact carrier 16 is nevertheless adequately fixed in position since injection molding around its outer peripheral region is entirely sufficient for such fixing.
Year of fee payment: At the same time, the cover provides protection against touching of the electrical contacts located below it.
US20080163853A1 – Actuating Drive for Actuating a Fuel Injection Valve – Google Patents
On the outer periphery of the collar 36 a the opening area is comparatively large approximately rectangular and open towards the topwhereas it is adjoined via a step in the opening edge by a smaller opening area which opens into the cavity below the cover 28 a.
In this exemplary 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.
According to a further embodiment, the connecting device may include an electrically 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 contact pins projecting from the plastics molding.
The gas-permeable embodiment of the sealing arrangement may be realized in various ways. A fuel injector, comprising 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.
In the simplest case, such materials may be used at precisely the locations at which sealing elements for example, sealing rings, etc. 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.
Other possible explanations are, 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.
Furthermore, a sleeve of insulating material, which effects centering and electrical insulation of the contact pin, is inserted in each opening below the sealing ring. In this respect, latching is superior to, for example, ultrasound welding between cover and housing arrangement, which is possible in principle.
Means that form bonds with the hydrogen in the potting compound or duct oxygen thereto are provided in further embodiments. The fuel injector according to claim 12wherein the cover has on its periphery an annularly continuous collar projecting in the axial direction.
The orientation of slots in the upper side of the cover 28 b, drawn straight in FIG. 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.
An actuator for actuating a fuel injection valve has a piezoactuator, enclosed in an actuator housing unit 14, The plug connector 18 is an external connection device by means of which the actuating drive 10 and the fuel injector formed therewith can be connected to an external activation line arrangement for example, wiring harness in a motor vehicle in order to activate the piezo actuator in the desired manner for the injection of fuel.
Klaus Plecher – Google+
The welding lugs of the contact carrier are connected electrically to laterally projecting contacts which can klajs be used for external connection of the finished fuel injector. Sealing apparatus assembly for sealing a piezoactuator and method for sealing a piezoactuator. 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 once the kalus 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.
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 According to a further embodiment, the cover may have on its periphery an annularly continuous collar projecting in the axial direction. Actuator for a fuel injector of an internal combustion engine. To illustrate this, further embodiments will be described below, although they are again to be understood only as examples.
The actuating drive according to claim 7wherein the plastics molding contains at least one gas exchange passage. Such an environment is produced, in particular, if a fuel injector and at least one further component of klaux fuel injection system are arranged substantially completely inside an engine block assembly of the internal combustion engine.
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.
Actuating drive for actuating a fuel injection valve.
Klaus Plwcher has filed for patents to protect the following inventions. In addition, in this embodiment a peripheral collar 34 c pelcher 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 lpecher side of the collar 36 c when the cover 28 c is fitted. One means consists in reducing the concentration of hydrogen in the potting compound, with appropriate thermal processes as a result of which the concentration of hydrogen will be reduced to below a predefined threshold being applied after the piezoelectric actuator has been encased in the potting compound.
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. 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.
Oxygen plechfr contained in the piezoelectric actuator’s piezoelectric ceramic. Actuator for Actuating a Fuel Injection Valve. Through the extremely simple assembly step of pressing the components together, it is achieved with certainty that the piezo actuator located inside the actuating drive will not be damaged.