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Klaus Plecher has filed for patents to protect the following inventions. In the Figure, this cover 28formed as a plastics injection molding, is shown still separate from the other visible actuating drive components, but forms an upper end closure thereof on the finished fuel injector.
The fuel injector according to claim 18wherein the cavity directly adjoins an end face of the plastics molding oriented away from the piezo actuator. A further contacting arrangement for electrically klsus contact pins of a piezo actuator to laterally projecting connection pins of an external connection device is known, for example, from DE 44 C1.
Klaus Plecher Inventions, Patents and Patent Applications – Justia Patents Search
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.
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. 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.
Pleche 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. According to a further embodiment, the cavity may directly adjoin an end face of the plastics molding oriented away from the piezo actuator.
US20080163853A1 – Actuating Drive for Actuating a Fuel Injection Valve – Google Patents
In the embodiment illustrated, gas exchange openings 38for example, are provided in the collar 36 of the integral plastics injection molding This refers, in particular, to the case in which components of the injection system which might be arranged outside an engine block assembly without detriment to their operation are housed inside said engine block assembly.
The invention is described in more detail below in relation to exemplary embodiments with reference to the appended drawings, in which:. According to a further embodiment, the cover may have on its periphery an annularly olecher collar projecting in the axial direction. This configuration klays the covering pledher a positive effect on ventilation of the piezo actuator, a catch connection being provided for fixing the cover to the actuating drive, so that assembly of the cover is especially simple.
The welding lugs of the contact carrier are connected electrically to laterally projecting contacts which can therefore be used for external connection of the finished fuel injector. The fuel injector according to plecherr 13wherein the integral plastics pleched 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.
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.
Oxygen is contained in the piezoelectric actuator’s piezoelectric ceramic. 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.
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.
Method for positioning the actuating drive in a fuel injector device for implementing said method. Appropriate means are employed so that unsaturated bonds of the hydrogen in the potting compound will release less oxygen plechher the piezoelectric ceramic.
USA1 – Actuating Drive for Actuating a Fuel Injection Valve – Google Patents
At the same time, the cover provides protection against touching of the electrical contacts located below it. 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.
Year of fee payment: 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 b. 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, The orientation of slots in the upper side of the cover 28 b, drawn straight in FIG. Klaus Plecher, Marcus Unruh.
It will be understood that the latching between the cover and the upper end of the actuating drive housing arrangement, and any ventilation passages in the attachment area, can be realized in various ways.
Alternatively or additionally, such openings may be provided in the cover 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.
The actuating drive klaud comprises a sleeve-shaped metal actuator housing 12 with a piezoelectric actuator abbreviation: In order 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 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 llecher sealing element 32 and the top arrangement 18,