WO2014012738A1 - Electrical connection arrangement for an ignition coil - Google Patents

Description

 Description title

 Electrical connection arrangement for an ignition coil prior art

The present invention relates to an electrical connection arrangement, in particular for an ignition coil, and in particular for the electrical

Contacting thin, surrounding with paint wires. Furthermore, the present invention relates to an ignition coil and a method for producing a cold contact with an ignition coil.

Ignition coils are of the prior art in different

Embodiments known. Common contacting methods of thin enameled wires in ignition coils are generally thermal methods, e.g. Soldering or different welding methods. Furthermore, from DE 10251841 A1 a cold contact is known in which a Kontaktierfeder via

Windings made of enameled wire is lifted and then snaps by a spring-like configuration, so that the elements which are provided on the contact spring, break through an insulating layer of the enameled wires for an electrical connection. In some cases, however, electrical contacting by means of the snap action is problematic. Furthermore, it is sometimes necessary to use other electrical components, such as e.g. Diodes to electrically connect to the ignition coil. Again, a hot-contacting is usually provided, resulting in an additional step in contacting the electrical components.

Disclosure of the invention

The electrical connection arrangement according to the invention with the features of claim 1 has the advantage that a cold Contacting both an enameled wire and an electrical connection wire to be connected to the enameled wire, via a common

Contact element is possible. According to the invention, a common contact element can be used for electrically contacting the enameled wire and the electrical connection wire. Furthermore, according to the invention a reduced size in the axial direction can be achieved by the skillful electrical contacting. Another advantage with regard to the installation space is that no additional installation space, for example for welding tongs and the like, must be provided for hot contacting by means of the electrical connection arrangement according to the invention. This can be an optimized

Arrangement of components are made possible. This is inventively achieved in that the contact element has a first and second recess, which form between them a constriction, around which the enameled wire is wound several times. Furthermore, an orientation of the enameled wire at a bottom region of the first and second recesses of the

Contact element parallel to an orientation of the electrical connection wire on the contact element. By this measure, in particular the compactness of the electrical connection arrangement is ensured in a component-saving cold contacting. The electrical connection arrangement is in particular designed to realize a cold contacting of an enameled wire and an electrical connection wire to an ignition coil, e.g. for an electrical component such as a diode.

The dependent claims show preferred developments of the invention.

Particularly preferably, the common contact element is a contact plate, which extends in a plane and wherein the electrical connection wire and the enamel wire in the first and second recesses are perpendicular to the plane.

More preferably, the common contact element has a third

Recess for receiving the electrical connection wire. As a result, the connecting wire can be contacted separately cold and the first and second recess are aligned optimally winding. According to a particularly preferred alternative, the electrical

Connection wire arranged in the first and / or second recess.

As a result, it is not necessary to provide an additional additional recess on the common contact element, but it is only exactly two recesses on the contact element necessary to contact the enameled wire and the electrical connection wire cold. In this case, the electrical connection wire is particularly preferably arranged on an outer side of the enameled wire wound on the contact element and makes contact with the enameled wire. As a result, a lacquer layer of the outer enamel wires is additionally broken and an electrical contact between the electrical

 Connecting wire and the enameled wire produced. Particularly preferably, the electrical connecting wire is pressed from the outside to the inside on the wound enameled wire and thus damaged in addition to the

Outside of the enameled wire also inside lacquer layers on

Enamelled wire to allow a particularly secure electrical cold contact.

Particularly preferably, the recess, in which the electrical

Terminal wire is arranged, a greater depth than a depth of the other recess. This ensures that the electrical connection wire does not project in an undesired manner over an outer circumference of the contact element.

In order to ensure a particularly secure cold contacting, the first and second recesses each have at least one sharp edge. The sharp edge is particularly preferably provided on the bottom area, preferably on both exposed edges on the floor area.

More preferably, the electrical connection arrangement comprises a diode, wherein the electrical connection wire connects the diode to the contact element (cold contacted).

Particularly preferably, a diameter of the electrical connection wire is greater than a diameter of the enameled wire. More preferably, a width of the recess, in which the electrical connection wire is arranged, equal to a diameter of the electrical connection wire. This will allows a secure cold contact between the electrical connection wire and the contact element. Furthermore, this ensures that the electrical connection wire can clamp in the recess, so that no additional means for fixing the electrical connection wire in the recess are necessary.

More preferably, the first and / or second recess has a tapered insertion area and a receiving area for receiving the enameled wire and in particular also for receiving the electrical

Connection wire on. This will be a simple wrapping the

 Constriction ensured by the enameled wire and thus a faultless production.

More preferably, the first and second recesses are vertically aligned. The first and second recesses are preferably located opposite the contact element on opposite sides.

Furthermore, the present invention relates to an ignition coil comprising an electrical connection arrangement according to the invention. Preferably, the electrical contact element is arranged on a bobbin. More preferably, the ignition coil comprises a diode which is cold contacted via the electrical connection wire with the enameled wire. Preferably, a central axis of the diode is coaxial with a central axis of the electrical connection wire. This can be a particularly compact design

be ensured. More preferably, a central axis of the diode is provided perpendicular to a longitudinal axis of the ignition coil.

Furthermore, the present invention relates to a method for producing an electrical connection assembly of an ignition coil having only cold contacts, wherein in a first step, an enameled wire is repeatedly wound on a contact element at a first and second recess at a Einschnürbereich and then an electrical lead wire, preferably with a larger diameter than the enameled wire, is introduced from the outside on the wound wire wound wire in at least one of the recesses on the contact element and presses on the wound enameled wire. This will be an improved cold Contacting achieved because the enameled wire is broken on the one hand by wrapping around the constricting and cold contact allows, and on the other hand by the additional step of inserting the electrical lead wire from the outside an additional force is exerted on the wound enameled wire, which promotes additional paint abrasions to a to allow improved cold contacting. At the same time a cold contact between the electrical connection wire and the enameled wire or the contact element, in particular by providing a press fit between the electrical connection wire and the recess, is provided.

drawing

Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. Identical or functionally identical parts are designated in the exemplary embodiments with the same reference numerals. In the drawing is:

FIG. 1 shows a schematic plan view of an ignition coil according to a first exemplary embodiment of the invention,

Figure 2 is a perspective detail view of a contact element of

 FIG. 1,

Figure 3 is a schematic sectional view of the contact element of

 FIG. 2,

Figure 4 is a perspective view of an electrical

 Connecting arrangement according to a second embodiment of the invention, and

Figure 5 is a schematic view of an electrical

 Connecting arrangement according to a third embodiment of the invention.

Preferred embodiments of the invention Hereinafter, an electrical connection assembly 2 for an ignition coil 1 will be described in detail with reference to FIGS. As can be seen from FIG. 1, the ignition coil 1 according to the invention comprises an electrical connection arrangement 2 and a coil body 20 with a multiplicity of circumferential chambers 21, in which an enameled wire 3 is wound several times. The electrical connection assembly 2 comprises a plate-shaped

 Contact element 4, which is arranged exclusively in a plane E. The contact element 4 has a first recess 11 and a second recess 12, which form a constriction 14 between them. The first

Recess 1 1 and the second recess 12 are each other

arranged opposite and have the same depth. As can be seen from FIG. 2, the enamel wire 3 is several times around the constriction 14

wound around and then led to the bobbin 20. Here are at the first recess 1 1 and the second recess 12 each a first

Insertion area 15 and a second insertion area 16 for a simpler

Winding the enameled wire provided on the constriction 14. The first

Recess 1 1 and the second recess 12 each still have a receiving area 17,18, in which the enameled wire 3 and the electrical connecting wire 7 are arranged. A diameter of the electrical connection wire 7 is chosen such that the electrical connection wire 7 in the first recess 1 1 can be firmly pressed. As can be seen in particular from the sectional view of Figure 3, are thus after wrapping the enameled wire 3 at the

Constriction 14 several individual enamel wires with the edges of the constriction 14, which are all sharp-edged, in contact, so that the lacquer layer, especially in the region of the edges, is torn to a cold

To ensure contact. In this case, the electrical connection wire 7 additionally presses on the outermost enameled wires 3 in the first recess 11, so that cold contacts are additionally created here. At the same time there is an electrical connection between the electrical connection wire 7 and the uppermost outermost enameled wires 3 as well as directly with the contact element 4. As can be further seen in particular from FIG. 1, an alignment of the electrical connecting wire 7 is such that a central axis YY of the electrical connecting wire 7 is perpendicular to a center axis XX of FIG

Ignition coil 1 is (see Figure 1). Furthermore, a diode 8, which is connected via the electrical connection wire 7 with the contact element 4, aligned such that a longitudinal axis of the diode 8, which coincides with the central axis Y-Y of the electrical connection wire 7, perpendicular to the central axis X-X of the ignition coil 1. This allows a very compact arrangement of the diode 8 or other electronic components, which are arranged on the ignition coil 1, are made.

Thus, as can be seen in particular from Figures 2 and 3, thus an alignment of the enameled wire 3 at a bottom portion 41, 42 of the first and second recess 1 1, 12 on the contact element parallel to an orientation of the electrical lead wire 7 on the contact element 4. Next extends the electrical connection wire 7 and the enameled wire 3 at the bottom region 41, 42 perpendicular to the plane E, in which the contact element 4 is located. This embodiment of the invention thus makes it possible to make a particularly compact connection of a diode 8 or another electrical component to the ignition coil 1.

As can be seen in particular from FIG. 3, a depth T1 is the first one

Recess 1 1 equal to a depth T2 of the second recess 12. In this case, the receiving area 17 of the first recess 1 1 is selected such that both the multi-coated enameled wire 3 and the electrical connection wire 7 can be completely accommodated in the first receiving area 17. As a result, the contact element 4 essentially has an H-shape with a connection region 22 to the bobbin 20. Further electrical

Components can be made in addition to the second recess 12 or from the other direction in addition to the first recess 1 1 with another electrical connection wire. Thus, the contact element 4 according to the invention is adapted, in addition to the enameled wire 3, several electrical components, such as the diode 8, to contact cold. An electrical contacting of the lead wire 7 can easily by a Press fit between the lead wire 7 and the first recess 1 1 can be achieved.

Thus, according to the invention, an easy-to-implement solution for a cold contacting of enameled wires and electrical connection wires to a common contact element 4 is shown, which is especially advantageous in connection with ignition coils. In particular, contacting errors can be minimized by the inventive idea. Also, according to the invention, a quick and easy visual inspection of the contact made. In this case, the contact element 4 as a simple

 Sheet metal stamping be made, which also automatically sharp edges for tearing the paint layer on the enameled wire 3 are obtained.

As a result, the manufacturing costs can be further reduced. In particular, according to the invention, no preliminary removal of the insulating lacquer layer on the enameled wire 3 is necessary. Another advantage of the invention is that no free end of the wire, both on the enameled wire 3 and the electrical connection wire 7, must protrude. As a result, in particular, an electric field increase in the case of the prevailing at the ignition coil

High voltage can be avoided. Furthermore, additional electrical components, such as e.g. a diode 8, space-optimized and also by means of cold

Contacting be involved.

Figure 4 shows a second embodiment of the present invention, wherein the depth T2 of the second recess 12 is smaller than the depth T1 of the first recess 1 1 is formed. This is possible because the second

 Recess 12 must accommodate only the multi-coated enameled wire 3. Furthermore, the second recess 12 is formed only with a receiving area 18, which is designed to be tapered. Thus, in particular the dimensions of the contact element 4 can be optimized in the vertical direction and a further space saving is possible.

FIG. 5 shows a third embodiment of the electrical connection element 2 according to the invention, which, in contrast to the preceding exemplary embodiments, has a third recess 13. The third

Recess 13 serves to receive the electrical connection wire 7 separately. Furthermore, a first and a second recess 1 1, 12th provided, which form between the constriction 14, around which the enamel wire 3 is wrapped. Further, a foot 40 is provided on the contact element 4, with which the contact element 4 is fixed to the bobbin 20. In this case, both the foot 40 and the remaining contact element 4 are again in a common plane. Next, the electrical connection wire 7 and the enamel wire 3 in the region of the constriction 14 again on such

Contact element 4 arranged that their orientation is perpendicular to the plane E. The foot 40 is designed such that it can be firmly connected only by plugging the bobbin 2 with this.

Thus, all described preferred embodiments of the present invention show an advantageous ignition coil 1, in which by means of cold contacting both a paint wire 3 and other electrical components can be connected to each other. A welding process or a

Soldering or the like. Is therefore no longer necessary, so that in particular manufacturing costs can be significantly reduced. Furthermore, by the skilful embodiment of the plate-shaped contact element 4 a

Space optimization in the attachment of additional electrical components are made possible.

Claims

claims 1 . Electrical connection arrangement, in particular for an ignition coil, comprising:  an enameled wire (3) surrounded by an insulating lacquer, - a contact element (4), and  an electrical connection wire (7),  characterized in that  the enamel wire (3) and the lead wire (7) electrically contact the contact element (4), and  - The contact element (4) has at least a first recess (1 1) and a second recess (12), which between them a Forming a constricting area (14) around which the enameled wire (3) is wound,  wherein an orientation of the enameled wire (3) on a bottom portion (41, 42) of the first and second recesses (1 1, 12) is parallel to an orientation of the lead wire (7) on the contact element (4). 2. Connecting arrangement according to claim 1, characterized in that the contact element (4) is a contact plate which extends in a plane (E) and the electrical connection wire (7) and the enameled wire (3) in the first and second recess perpendicular to Level (E) run. 3. Connecting arrangement according to claim 2, characterized in that the contact element (4) further comprises a third recess (13) for receiving the electrical connection wire (7). 4. Connecting arrangement according to claim 1 or 2, characterized in that the electrical connection wire (7) is arranged in the first and / or second recess. Connecting arrangement according to claim 4, characterized in that the electrical connection wire (7) is arranged on a side facing the outside of the wound on the contact element (4) enameled wire (3). Connecting arrangement according to claim 4 or 5, characterized in that the first recess (1 1), in which the electrical connection wire (7) is arranged, a greater depth (T1) than a depth (T2) of the second recess (12). Connecting arrangement according to one of the preceding claims, characterized in that an edge on the bottom region (41, 42) of the first and / or second recess is formed as a sharp edge. Connecting arrangement according to one of the preceding claims, further comprising an electrical component (8), in particular a diode, wherein the electrical connection wire (7) connects the electrical component (8) with the contact element (4). Connecting arrangement according to one of claims 4 to 8, characterized  a diameter of the electrical connection wire (7) is greater than a diameter of the enameled wire (3), and / or  in that a width of the first recess (11) in which the electrical connection wire (7) is arranged is equal to or smaller than a diameter of the electrical connection wire (7). Connecting arrangement according to one of the preceding claims, characterized in that the first recess (1 1) has a tapered insertion region (14) and a receiving area (17) for receiving the enameled wire (3). Ignition coil comprising an electrical connection arrangement (2) according to one of the preceding claims. A method for producing an electrical connection arrangement (2) of an ignition coil, which comprises only cold contacts, wherein in a first step, an enameled wire (3) on a contact element (4) on a first and second recess (1 1, 12) on a Constricting area (14) is wound around several times and then an electrical connection wire (7), preferably with a larger diameter than the enameled wire is introduced from the outside on the wound enameled wire (3) in at least one of the recesses on the contact element and presses on the wound enameled wire.