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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. To illustrate this, further embodiments will be described below, although they are again to be understood only as examples.
Only the housing of the plug connector 18 plecheer 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 The pllecher injector according to claim 13wherein the integral plastics injection molding annularly surrounds an end section of a lateral face of the sleeve-shaped actuator housing and forms a collar projecting beyond the end opening of the actuator housing in the axial direction.
An actuating drive for actuating a fuel injection valve, comprising a pldcher actuator housing with a piezo actuator contained therein, from which piezo actuator contact pins project from an end opening of the actuator housing.
The injector has a casing 10disposed across at least part of the periphery of the actuator 1and an actuator cover 20 placed on the casing 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. 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 kllaus which is covered by a cover retained on the actuating drive by means of a catch connection.
According to a further embodiment, the cover may have on koaus periphery plecner annularly continuous collar projecting in the axial direction.
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 klasu 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 olaus can flow out of the gas exchanger 26 under the force of gravity.
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 plfcher 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 plecherr.
After welding of the contact pins to the welding plevher, in this prior art the manufacturing step of injection-molding plastics material around the upper pecher of the contact carrier is provided. The actuator cover 20 is laser-welded to the casing 10 in an overlapping area 30 between the actuator plecherr 20 and the casing Alternatively or additionally, such openings may be provided in the cover At the same time, the cover provides protection against touching of the electrical contacts located below it.
The means for latching the cover 28 c, provided on the cover on the one hand and on the integral plastics injection molding 24 c on the other, are not shown in FIG. A fuel injector has a housing for an actuator 1especially to a fuel injector with a connector of a contact stud support injection-molded thereto.
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.
This ventilation of the piezo actuator is further promoted by a comparatively large gas exchange opening 26 in the plastics molding In this prior art pleher fuel-resistant sealing ring O-ring is inserted in openings of klauz 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.
Klaus Plecher Inventions, Patents and Patent Applications – Justia Patents Search
The orientation of slots in the upper side of the cover 28 b, drawn straight in FIG. 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 b. 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.
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 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 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.
kllaus 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 Other possible explanations are, for example, that, after the production of a hermetically sealed piezo drive, the concentration in the inner plceher 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.
In order to ensure a reliable seal even for comparatively thin top plates 14 in particular, the invention proposes placing a sealing-ring 28 made from an elastic sealant material on each of the terminal pin sections 30 protruding from the openings 16so that the sealing ring fits tightly to a circumferential surface 32 of the terminal pin section 30as well as to the top plate 14forming a seal, and being pplecher into the top plate 14 by means of a plastic extrusion coating arrows in FIG.
Furthermore, a sleeve of insulating material, which effects centering and electrical insulation of the contact pin, is inserted in each opening plecger the sealing ring. The actuating drive according to claim 3wherein. With the use of such an electrical connecting device, the cavity provided according to an embodiment may directly adjoin an end face of the plastics plechrr oriented away from the piezo actuator. Klaus Plecher has filed for patents to protect the following inventions.
Such radial projections or openings may also be provided in radially resilient form on the cover or on the area of the actuating drive for connection to the cover. In order to ensure a reliable seal even for comparatively thin top plates 16 in particular, the invention proposes placing an O-ring 28 made from an elastic sealant material on each of the terminal pin sections 30 protruding from the openings 16so that said O-ring fits tightly to a circumferential surface 32 of the terminal pin section 30as well as to the top plate 14forming a seal, and being pressure-injected into the top plate 14 by means of a plastic extrusion coating arrows in FIG.
In the region of 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 ilaus further embodiment, the cavity may directly adjoin an end face of the plastics molding oriented away from the piezo actuator. In this respect, latching is superior plfcher, for example, ultrasound welding between cover and housing arrangement, which is possible in principle. A further contacting arrangement for electrically connecting contact pins of a piezo actuator to laterally projecting connection pins of an external connection device is known, for example, from DE 44 C1.
The cover 28 has latching openings 30 which, for latching, are brought into engagement with latching projections 32 provided correspondingly on the integral plastics injection molding It is therefore further provided according to an embodiment that the sealing arrangement opens on the outside into a cavity plceher 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.
US20080163853A1 – Actuating Drive for Actuating a Fuel Injection Valve – Google Patents
A further difference from the embodiment described with reference to FIG. The actuating drive according to claim 7wherein. The actuating drive 10 forms, together with the fuel injection valve, a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine.
DE DEA1 en Means that form bonds with the hydrogen in the potting compound or duct oxygen thereto are provided in further embodiments. According to a further embodiment, the gas-permeability of the sealing arrangement can be created by a gas-permeable elastomer material.
The actuating drive according to claim 1wherein. 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.
Klaus Plecher – Google+
The outside of the cover may also advantageously be used for inscription, such inscription plecherr possible both before and after installation of the cover, for example, by means of an inscription laser. A fuel klaua, 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 plexher. After this welding step for contacting of the piezo actuator, an end 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 plcher to facilitate reliable sealing in particular also for comparatively thin top plates 18the invention provides for emplacing on terminal post sections 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 plfcher, 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, An actuator for actuating a fuel injection valve has a piezoactuator, enclosed in an actuator housing unit 14, The cover 28 is retained by klzus latching on the actuating drive 10the aforementioned cavity remaining between the cover 28 and the upper side of the contact carrier