EP0893855A2 - Cable connection on an electromechanical assembly element - Google Patents

Abstract

The cable connection contacts an electro-mechanic component (1) which executes movements, extensions, or compression in the area of a connection guide. Cables (4) of the cable connection are led tangential at one of the sides of the component in the area of the connection guide. The cables are respectively connected tangentially at a connecting point (3) with the component, extending crosswise to the direction (5) of the movement, extension, or compression. The cables of an essentially parallel led cable pair are preferably led tangentially at opposite sides of the component.

Description

State of the art

The invention relates to a cable connection for an electromechanical Component, in particular a component, that in the area of the connection point of the cable on the component Performs movements, stretches or compressions, according to the preamble of the main claim.

For a piezo component, for example, it is known that when changing an electrical voltage across electrodes the piezo component via contacts on the side surfaces Strains or compressions also across the Voltage connection contacts are executed. Hereby can this piezo component as an actuator for switching or other mechanical processes are used.

In a conventional way, the cable for the feed line the voltage at right angles to the corresponding side surface of the piezo component and there with Surround soft solder or conductively glued. From here it will Connection cable flexible to an external connection point led away. In the area of this relatively rigid connection point on the piezo component are caused by the stretching and compression caused mechanical vibration Loads at the junction leading to a Breakage of the cable.

Advantages of the invention

A cable connection for an electromechanical component the type described above is with the invention Characteristics of the characterizing of the main claim thereby advantageous that a more flexible connection of the cable on the component, possibly also for tolerance compensation, can be achieved.

Because in the connection cable, for example with a piezo actuator as a component, high currents in the range of 60 A in Intervals of 200 µs can flow here the embodiment according to claim 2 is particularly advantageous, that through the parallel guidance the induction cancel and thereby the arrangement from an EMC point of view can be optimized.

The embodiment according to claim 3 also results an advantageous cable routing because of the connection points the cable with the component to save space in a corner adjacent sides of the component are placed can.

In order to obtain a particularly elastic cable routing, becomes the relatively thin and possibly highly flexible Cable in a simple way through a housing for the component through to a tangent to the housing Insulation plate guided and soldered there at connection points or clamped in an advantageous manner or crimped on. From here a thicker and stiffer one can Cables as a connection line to other electrical control or regulating devices. The insulation plate thus advantageously serves as a cable guide, as cable insulation, for vibration damping and as Carrier for connecting elements (clamps, soldering plates etc.) and as strain relief for the flexible cable on the component.

Due to the tangential feed of the respective cable which are transverse to the direction of expansion or compression of the Component extending connection point on the component (Solder or adhesive connection) can be a hindrance be minimized to the expansion of the component. The assembly of the cable is opposite one right-angled, radial feed much easier. This is true even for an assembly in little or non-moving foot area, i.e. in the field of mechanical Breakpoint of the component, too, because here a small one Installation space both directly on the component and for the wire feed in the connection area or on the housing is required for the component outside.

The connection point with the wire or cable contact on the piezo actuator as a component can be advantageous Way across the full width of the component, resulting in a short overall length with low current densities is enabled and relatively low tensile stresses from the outside be introduced to the piezo actuator.

Other advantageous developments of the invention are in specified in the subclaims.

drawing

Figur 1 eine Prinzipansicht eines Piezo-Aktors als elektromechanisches Bauelement mit einem elektrischen Kabelanschluss;

Figur 2 eine Kabelführung am Piezo-Aktor nach Figur 1 mit jeweils einer Kabelschleife;

Figuren 3 und 4 ein gegenüber den Figuren 1 und 2 durch eine andere Ausbildung einer Isolationsplatte jeweils geändertes Ausführungsbeispiel;

Figuren 5 und 6 Ausführungsbeispiele mit jeweils um 45° geneigt zugeführte Kabel;

Figuren 7 und 8 jeweils Kabelbefestigungen am Fußpunkt des Piezo-Aktors und

Figur 9 eine andere konstruktive Ausführungsform des Anschlusspunktes für das Kabel.

Exemplary embodiments of the cable connection according to the invention for an electromechanical component are explained with the aid of the drawing. Show it:

Figure 1 is a schematic view of a piezo actuator as an electromechanical component with an electrical cable connection;

FIG. 2 shows a cable guide on the piezo actuator according to FIG. 1, each with a cable loop;

FIGS. 3 and 4 show an embodiment which has been changed in relation to FIGS. 1 and 2 by a different design of an insulation plate;

FIGS. 5 and 6 exemplary embodiments, each with a 45 ° inclined cable;

Figures 7 and 8 each cable attachments at the base of the piezo actuator and

Figure 9 shows another design embodiment of the connection point for the cable.

Description of the embodiments

In the embodiment of Figure 1 is as a component a piezo actuator 1 for injection valves on an internal combustion engine in a car cut in one shown housing 2 guided so that it is expansion or Can perform upsetting movements. At two junctions 3 (only one visible here) becomes a thin one highly flexible, largely insulated cable 4, for example attached via a soft solder. By creating one The piezo actuator carries electrical voltage on the cables 4 1 Stretching or compressing movements according to one Arrow 5 off.

The housing 2 has elongated cable entries 6 Recesses through which the cables 4 and optionally further cables are led outside, whereby the cable glands 6 in the direction 5 of the expansion or Extend the upsetting movement of the piezo actuator 1. Outside an insulation plate 7 is fixedly attached to the housing 2, which also have the corresponding cable bushings 6 and at which the cable 4 can be connected for strain relief. Of the Connection points 8 can be thicker, stiffer cables 9 too led further electrical control or regulating devices become.

2, the cables 4 are parallel performed in a loop 10 so that the stretch or Compression movement according to arrow 5 in a simple manner elastic can be caught and at the same time a low induction Construction is guaranteed. Instead of one Loop 10 can also have multiple loops 10 or Turns are attached. By an opposite Field, caused by the current flow and the sense of turns, can the resulting in the two loops 10 magnetic Field to be compensated to the outside.

The insulation plate 7 also serves as a damping for those caused by the stretching or compressing movement Vibrations and isolates each one at the same time Cable 4 against the housing 2.

In Figure 3 is a modification of the embodiment shown in Figure 1, in which the insulation plate 7 with Insulating pins 7a into the space for the piezo actuator 1 are led. This can isolate the cable 4 in the area of cable glands 6 also for one here even uninsulated cable 4 and an improved one Vibration damping can be achieved. Figure 4 shows in similarly a change in the presentation Figure 2 with a pulled down with insulating pin 7a Insulation plate 7.

In a further exemplary embodiment according to FIG. 5 the cables 4 to adjacent sides of the component 1 led. Cross the cable glands 6 here at an angle of approximately 90 °, however, they in one, in the direction of movement of the component 1 slightly offset level are arranged. An embodiment according to FIG. 6 again shows one with Insulation extensions 7a pulled down insulation plate 7, whereby here the explanations for Figures 3 and 4 is referred. In this version, the insulation plate 7 also with the insulation extensions 7a are carried out, with an angled at 90 ° Extension 7a (dashed line in Figure 6) a better fixation of the insulation plate 7 is achievable.

The connection points 3 of the cables 4 can, according to FIG. 7 or 8 in addition, in FIGS. 1 and 2 concealed, foot area of the component 1 on a fixed Edition be arranged. At the foot area that is Component 1 is held mechanically and leads from this area the same stretches but the absolute movements are relatively small due to the shorter length and cause the smallest tensile stresses the respective connection point 3. The foot area can moreover, they can also be carried out completely without stretching.

FIG. 9 shows a variant of the respective connection point 8, which shows a soldering base that positively glued into the insulation plate 7 or is cast on this. This will be from below if necessary uninsulated cable 4 and at the other end the stiffer cable 9 for the further external connection soldered on.

Claims (11)

Cable connection for an electromechanical component in which the component (1) executes movements, expansions or compressions in the area of the connection guide, characterized in that the cables (4) of the cable connection in the area of the connection guide are each brought tangentially to one of the sides of the component (1) and each at a connection point (3) that also extends tangentially and transversely to the direction (5) of movement, expansion or compression the component (1) are contacted. Cable connection according to claim 1, characterized in that the cables (4) of an essentially parallel pair of cables are brought tangentially to opposite sides of the component (1). Cable connection according to claim 1, characterized in that the cables (4) are brought tangentially to adjacent sides of the component (1). Cable connection according to claim 3, characterized in that the cables (4) intersect in the connection area or in the area of a cable bushing on a plane slightly offset in the direction of movement (5) of the component (1). Cable connection according to one of the preceding claims, characterized in that the cables (4) are each guided in a loop (10) from the respective connection point (3) to a cable bushing (6) in a housing (2) for the component (1). Cable connection according to claim 5, characterized in that the cables (4) are each led in several loops (10) or turns to the respective connection point (3). Cable connection according to one of the preceding claims, characterized in that the cable bushings (6) of the cables (4) are elongated in the direction (5) of movement, expansion or compression of the component (1). Cable connection according to one of the preceding claims, characterized in that the respective connection points (3) are located in the foot area of the component (1). Cable connection according to one of claims 4 to 8, characterized in that the cable bushings (6) are also passed through an insulation plate (7) attached to the outside of the housing (2), the insulation plate (7) being fixed connection points (8) for strain relief of the flexible cables (4) and for the electrical connection of cables (9 ) having. Cable connection according to claim 9, characterized in that the insulation plate (7) is provided with insulation extensions or pegs (7a) drawn through the cable bushings (6). Cable connection according to one of the preceding claims, characterized in that the component (1) is a piezo actuator for injection valves on an internal combustion engine for a motor vehicle, which under the action of an electrical voltage at the connection points (3) carries out an expansion or compression.

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