EP2926413B1 - Electric contact arrangement for contacting a coil - Google Patents

Description

State of the art

The invention relates to an electrical contact arrangement for contacting a coil, in particular a coil of a speed sensor, with the features of the independent device claim and the use of an electrical contact arrangement in a speed sensor for the speed detection in an exhaust gas turbocharger.

Electric coils are used in many industrial products. One possible application concerns, for example, the use of an electrical coil as a rotational speed sensor. In industrial applications often the space for the introduction of such electrical coils, especially speed sensors, cramped. Therefore, a technical challenge is to accommodate the electrical coil together with their electrical contact in the smallest space and ensure safe electrical contact between the electrical connections and the coil over the lifetime of the application.

Electrical coils usually consist of a defined number of windings of a wire around a holding body. As an electrical wire, a thin metal wire is often used, particularly often so-called enameled copper wire. This electrical wire is surrounded by an electrically insulating lacquer layer, hereinafter referred to as insulation layer, in such a way that no electrical short circuit occurs between the contacting wire windings. The insulating layer used often consists of a protective lacquer, which often has a thickness of 1 to 5 microns. In order to operate the finished wound coil, the wire ends of the coil must be contacted electrically reliable, but in particular the insulation layer is reliably pierced. For this purpose, thermal contacting methods are often used, such as welding or soldering.

New description pages (fair copy)

Such thermal bonding processes require an additional work process, which entails increased equipment costs and process costs.

Moreover, it is often difficult to ensure in the available, tight space reliable electrical contact using the known thermal bonding method.

The DE 10 2004 002 935 A1 describes an electrical connection arrangement for producing an ignition coil, which is intended to replace conventional contacting methods for connecting thin enameled wires in ignition coils by a so-called "cold" contacting. However, such an electrical connection arrangement is preferably suitable for an end-side contacting.

Also the JP 2003 124043 A describes an electrical connection arrangement for contacting a coil. In this connection arrangement, a wire of the coil surrounded by an insulating layer is contacted by a spring element, in which a recess with a cut edge is formed, by pressing the cut edge against the insulating layer of the wire by the spring element. The insulating layer is thus penetrated by the cutting edge and the wire is electrically conductively connected to the cutting edge and the spring element.

Disclosure of the invention Advantages of the invention

Compared to the prior art, the electrical contact arrangement for contacting a coil with the features of independent device claim 1 has the advantages that the contact requires a very small space and that several different electrical contacts in different contact areas, which are not arranged on the front side of the support body , can be made reliably. In addition, systems for thermal bonding processes are dispensable. This results significant cost advantages and space advantages in the design of contacting a coil.

According to the invention, an electrical contact arrangement for contacting a coil, in particular a coil of a rotational speed sensor is proposed which comprises the following components: a holding body, wherein the holding body is electrically insulating, a line section of at least one electrical line, wherein the electrical line is surrounded by an electrical insulation layer, at least one spring element, wherein the at least one spring element is electrically conductive, wherein the spring element has at least one recess, wherein the at least one recess at its edge at least partially forms a cutting edge. In this case, the at least one spring element with the least one cutting edge is pressed against the line section such that the at least one cut edge through the electrical insulation layer is penetrated and an electrical contact between the at least one spring element and the at least one line section is made. According to the invention, at least one busbar is provided, wherein the at least one busbar is electrically conductive and the holding body and / or the at least one busbar is provided with clamping means, wherein the busbar is clamped by means of the clamping means to the holding body and thereby the spring element between the busbar and a contact region of the holding body is stretched and so the at least one line section is electrically contacted by means of the at least one spring element with the at least one busbar.

Particularly advantageous is the ability to clamp the busbar by means of the clamping means on the holding body and thereby reliably tension the spring element between the busbar and the contact region of the holding body over the entire life and so to produce a reliable electrical contact between the line section and the busbar. The clamping means also advantageously allow the busbar can also be guided along the side of the holding body and thus also a non-frontal cold contacting can be made in several contact areas of the holding body by means of multiple busbars. As a result, such an electrical contact arrangement can be produced in a particularly small space.

Compared to the prior art, the use of an electrical contact arrangement in a speed sensor for the speed detection in an exhaust gas turbocharger according to the independent use claim has the advantage that a speed sensor can be made by the particularly small size of the coil and the electrical contact arrangement, even in confined Space of an exhaust gas turbocharger housing is usable and has a particularly good signal noise behavior through its compact design. The contact arrangement according to the invention is also particularly suitable for low contacting costs to ensure reliable contacting of the speed sensor in the exhaust gas turbocharger over the entire service life and all operating states of the exhaust gas turbocharger. This results in considerable cost advantages with at least the same service life of the speed sensor.

Advantageous embodiments and further developments of the invention are made possible by the measures specified in the dependent claims.

The fact that the at least one spring element is made as a bending spring of a metal strip and that the at least one spring element electrically contacted at least one busbar, is advantageously achieved that the spring element is particularly flat and builds in the assembled state in a plane to the busbar and the plane of the holding body largely parallel plane between busbar and holding body comes to rest. Through the use of a spiral spring, safe contact is ensured by the spacing tolerance compensation effected by the spring element, even in the case of changes in distance between the busbar and holding body, for example as a result of thermal or mechanical stress.

An advantageous development of the electrical contact arrangement provides that the at least one bus bar is detachably connected to the holding body. This has the advantageous effect that the busbar is particularly easy to install and that the busbar in the case of maintenance can be easily replaced.

An advantageous development of the electrical contact arrangement provides that the contact region of a notch recess having at least one notch, that the at least one spring element has a spring element detent and that the at least one spring element for fixing to the holding body by means of at least one spring element detent engages in the notch recess and engages behind the at least one notch. This has the advantageous effect that the spring element is secured against slipping and captive on the holding body and thereby the assembly process can be advantageously simplified.

The fact that the at least one busbar engages endwise in a recess of the at least one spring element to form a pivot bearing for the at least one busbar, is advantageously achieved that the busbar can be particularly easily mounted on the holding body and fixed. Furthermore, it is advantageously achieved that the connection between the spring element and busbar is ensured permanently over the lifetime of the electrical contact arrangement and is not affected by aging processes of the material substantially.

An advantageous development of the electrical contact arrangement provides that the clamping means are formed on the holding body as at least one pin, wherein in the at least one bus bar at least a socket-like recess is formed such that the at least one pin is received in the at least one bush-like recess, wherein a frictional connection between the at least one pin and the at least one bush-like recess is formed. The formation of the clamping means as a pin and socket-like recess advantageously causes a particularly simple and secure mounting of the busbar to the holding body. Furthermore, when using more than one pin and more than one bushing-like recess, an exact positioning and alignment of the busbar relative to the holding body is advantageously effected.

Characterized in that the at least one spring element has at least one bending tab, wherein the at least one bending tab is bent around the at least one bus bar so that the at least one spring element is fixed to the at least one busbar, is advantageously effected that the busbar and the spring element is a mounting unit form, whereby the assembly of the electrical contact arrangement is particularly simple. In addition, this advantageously causes the electrical contact between the spring element and busbar is permanently ensured. Finally, it is advantageously achieved that the winding process during manufacture of the coil on the holding body can be easily performed, since in addition to the holding body and the enameled copper wire for the coil no moving parts are present, which could be solved during the winding process or the winding process to an imbalance could lead

A further exemplary embodiment of the electrical contact arrangement provides that the at least one spring element has two clamping arms projecting from the holding body, which surround the holding body in the contact region at least in regions, wherein the clamping arms have spring tabs at the ends, and wherein the at least one busbar is two to the holding body has protruding jaws and that the at least one busbar is pushed with their jaws on the clamping arms of the at least one spring element, that the spring tabs between the jaws and the holding body are stretched. By this development advantageously a particularly simple installation and a particularly secure contacting of the coil is effected.

Brief description of the drawings Embodiments of the invention

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.

• Fig. 1 a eine Explosionszeichnung durch eine erfindungsgemäße elektrische Kontaktanordnung zur Kontaktierung einer Spule gemäß einem ersten Ausführungsbeispiel;
• Fig. 1 b einen Ausschnitt aus der elektrischen Kontaktanordnung aus Fig. 1a;
• Fig. 1 c eine perspektivische Darstellung der elektrischen Kontaktanordnung zur Kontaktierung einer Spule im montierten Zustand gemäß Fig. 1 a;
• Fig. 2a eine Explosionszeichnung einer erfindungsgemäßen elektrischen Kontaktanordnung zur Kontaktierung einer Spule gemäß einem zweiten Ausführungsbeispiel;
• Fig. 2b eine perspektivische Darstellung der elektrischen Kontaktanordnung aus Fig. 2a während eines Montageschritts;
• Fig. 2c die elektrische Kontaktanordnung zur Kontaktierung einer Spule aus Fig. 2a im fertig montierten Zustand;
• Fig. 2d eine perspektivische Ansicht eines Querschnitts durch den Haltekörper aus den Figuren 2a bis 2c im Bereich der Rastkerben-Aussparung;
• Fig. 3a eine perspektivische Explosionszeichnung einer erfindungsgemäßen Kontaktanordnung zur Kontaktierung einer elektrischen Spule gemäß eines dritten Ausführungsbeispiels;
• Fig. 3b eine perspektivische Ansicht eines Querschnitts durch eine elektrische Kontaktanordnung gemäß Fig. 3a im Bereich des Kontaktbereichs;
• Fig. 3c eine perspektivische Darstellung einer Kontaktanordnung zur Kontaktierung einer elektrischen Spule gemäß der Figuren 3a und 3b im montierten Zustand.

Show it:

• Fig. 1 a is an exploded view of an inventive electrical contact arrangement for contacting a coil according to a first embodiment;
• Fig. 1 b a section of the electrical contact arrangement Fig. 1a ;
• Fig. 1 c a perspective view of the electrical contact arrangement for contacting a coil in the assembled state according to Fig. 1 a;
• Fig. 2a an exploded view of an electrical contact arrangement according to the invention for contacting a coil according to a second embodiment;
• Fig. 2b a perspective view of the electrical contact arrangement Fig. 2a during an assembly step;
• Fig. 2c the electrical contact arrangement for contacting a coil Fig. 2a in the assembled state;
• Fig. 2d a perspective view of a cross section through the holding body of the FIGS. 2a to 2c in the region of the notch recess;
• Fig. 3a an exploded perspective view of a contact arrangement according to the invention for contacting an electrical coil according to a third embodiment;
• Fig. 3b a perspective view of a cross section through an electrical contact arrangement according to Fig. 3a in the area of the contact area;
• Fig. 3c a perspective view of a contact arrangement for contacting an electrical coil according to the FIGS. 3a and 3b in the assembled state.

Embodiments of the invention

Fig. 1a shows an electrical contact assembly 100 for contacting a coil 120, in particular a coil 120 of a speed sensor. The electrical coil 120 is thereby formed by windings of an electrical lead 140 around a holding body 200. The electrical lead 140 is preferably made of enameled copper wire, ie thin copper wire, which is surrounded by an electrically insulating insulating layer. The insulating layer preferably consists of a thin lacquer layer with a thickness between 1 and 5 μm. The insulating layer is necessary to prevent electrical short circuits within the wound bobbin and thus to allow a tight winding of the coil 120. The coil 120 is electrically contacted via two protruding from the bobbin wire ends. In the illustrated embodiment, the electric coil 120 is wound around a arranged at the end of the holding body 200 winding portion 210 of the holding body 200 and serves preferably as a speed sensor for an exhaust gas turbocharger.

The holding body 200 is made of an electrically insulating material, preferably made of plastic. The holding body 200, viewed from the winding region 210 of the coil 120, initially has a substantially round or elliptical cross section along an end region 214, which is particularly suitable for winding up the coil 120. In the further course, at the end of the end portion 214, a first collar 230 is formed. Along the longitudinal axis, a contact section 218 follows behind the first collar 230. In the contact section 218, the cross-section of the holding body 200 is substantially rectangular in this embodiment, the surface of the holding body 200 in the contact section 218 having two, on opposite sides, planar surfaces, each forming a contact region 220. In the further course of the holding body 200, a second collar 232 running around the holding body 200 follows, which coincides approximately with the end of the contact region 220 and which, in extension of the contact region 220, has a collar recess 234 which can also function as clamping means 240. Behind this second collar 232 are as Clamping means 240 acting pins 242 formed on the holding body 200, wherein on each side of the holding body 200, on which there is a contact region 220, two pins 242 are formed. However, in other embodiments, only one pin 242 or more than two pins 242 may be formed on each side of a contact region 220.

The electrical line 140, which is to be contacted, is thereby guided by the winding region 210 of the coil 120 along the end region 214 of the holding body 200 in the contact region 220 of the holding body 200.

The electrical contact device 100 further has a spring element 300, which has a T-shaped configuration, wherein the three T-ends of the spring element 300 are formed as bending tabs 340. In the spring element 300, three recesses 320 are arranged in the illustrated embodiment. The recesses 320 are formed substantially orthogonal to the longitudinal axis of the spring element 300. The edges 320 are each formed as a cutting edge 322. When the spring element 300 is subjected to a mechanical pressure, at least one cut edge 322 breaks through the insulating layer of the electrical line 140. This forms a mechanical and electrical contact between the preferably designed as a copper enameled electrical wire 140 and the electrically conductive spring element 300.

Furthermore, the electrical contact arrangement has a busbar 400, which has an elongated base body extending in a longitudinal direction with a substantially rectangular cross-section and is provided with bush-like recesses 440, wherein the sleeve-like recesses 440 are designed such that they press-fit to the pin 242 of the holding body can be set. The busbar 400 is particularly preferably made of an electrically conductive material, particularly preferably of a metal. In this case, the busbar 400 is structurally designed such that it has a sufficient flexural rigidity in order to be able to keep the spring element 300 in the installed state permanently tensioned against the holding body 200.

In the in Fig. 1 A illustrated perspective view of the electrical contact assembly 100 are acting on the underside two as a clamping means 240 Pin 242 visible. These serve for attaching a further bus bar 400 (not shown in the figure), which is suitable for contacting the other wire end of the coil 120, which represents another line section 142, by means of a second spring element 300 (also not shown here).

In Fig. 1 b the busbar 400 is shown with the attached to it by means of the bending tabs 340 spring element 300. The bending tabs 340 are bent around the busbar 400 in such a way that the spring element 300 is in fixed mechanical and electrical contact with the busbar 400. As in Fig. 1 b, the spring element 300 in the region of the recesses 320 in the form of a leaf spring. In this case, the area in which the recesses 320 are located protrudes out of the plane of the busbar 400, so that the spring element 300 is pressed in the direction of the busbar 400 upon application of pressure to the area with the recesses 320 and in this way is tensioned ,

Fig. 1 c shows the electrical contact assembly 100 from Fig. 1a in the assembled state. In this case, the pin 242 formed as a clamping means 240 of the holding body 200 are guided through the bush-like recesses 440 of the bus bar 400. The pins 242 are designed such that between at least one of the two pins 242 and one of the bush-like recesses 440 a non-positive connection, through which the busbar 400 is fixedly connected to the holding body 200. In order to enable the frictional connection between a pin 242 and a sleeve-like recess 440, the pin 242 may have a star-shaped cross-section, in which the distance from the pin center to the star tips is preferably slightly greater than the distance between the center of the sleeve-like recess 440th and the edge of the socket-like recess 440, so that the bus bar must be pressed onto the pin 242. However, other cross-sectional shapes of the pin 242 are conceivable, which ensure a secure frictional connection between the pin 242 and the bush-like recess 440 of the bus bar 400.

By clamping the busbar 400 to the holding body 200, the spring element 300 in the region of its recesses 320 between the busbar 400 and the holding body 200 is tensioned. The spring element 300 acts like a leaf spring. In the illustrated embodiment, the line section 142 comes between the holding body 200 and the spring element 300 to the plant. The Recesses 320 of the spring element 300 lie over the line section 142. By means of the cut edges 322 at the edges of the recesses 320 while clamping the busbar 400 to the holding body 200, the insulating layer of the line section 142 at least in the region of the cut edges 322 of the spring element 300 is broken the spring element thereby comes into direct mechanical and electrical contact with the line section 142. The thus produced electrical contact between the busbar 400 via the spring element 300 and the line section 142 and the lead wire 140 to the coil 120 is thus produced by a simple mechanical assembly process without thermal effects. The electrical contact between the spring element 300 and the line section 142 is also permanently ensured, since the busbar 400 is securely fixed by means of the sleeve-like recesses 440 on the pin 242 and the tensioned between the busbar 400 and the holding body 200 spring element 300 production-related distance differences between the bus bar 400 and the holding body 200 compensated by its spring force. Such differences in distance may be caused by aging effects of the materials or caused by mechanical and / or thermal stress.

The in the Fig. 1 a to 1 c embodiment shown allows a particularly secure and reliable winding of the coil 120 on the winding portion 210 of the holding body 200, since during the winding process except the coil wire formed as an electric wire 140 and the holding body 200 no further mechanical parts are involved and thereby mechanical imbalances during the winding process as far as possible can be avoided.

The in the Fig. 1a and 1c holding body 200 shown has along its longitudinal direction two collars 230, 232, so plate-like, spaced apart in the embodiment, beyond the normal diameter of the holding body 200 protruding elements. The two collars 230, 232 are configured such that they act as a radial guide of the elongate holding body 200 when inserting the acting as a preferred speed sensor body 200 in a speed sensor. They thus fulfill several functions: on the one hand they counteract tilting of the holding body 200 in the sleeve during insertion, which reliably and reliably ensures that the acting as a speed sensor element or detector coil coil 120 can be brought into abutment at the front end of the sleeve and so at a well-defined distance from the at least one rotating element whose speed is to be detected is brought. On the other hand, it is ensured by the collars 230, 232 that the support body 200 does not come to rest directly on the electrical line 140 or the line section 142 during storage prior to assembly or when being inserted into the sleeve of a rotational speed sensor, thereby undesirably penetrating the insulation layer. The collars 230, 232 thus act as handling protection against mechanical defects on the conducting wire and / or on the holding body 200 and / or on the busbar 400. The second collar 232 has a recess in the region of the busbar 400, which serves as an insertion aid when mounting the busbar 400 can serve on the pin 242 and as a clamping means against the busbar 400.

In Fig. 2a an exploded view of a second embodiment of a contact arrangement 100 according to the invention for contacting a coil 120 is shown. In this embodiment, the holding body 200 in its contact region on a notch recess 260 in which a latching notch 262 (in Fig. 2d shown in detail) is located. The spring element 300 is formed as a metallic stamped bent part and has in addition to the oblique to the main axis of the spring element 300 in this embodiment recesses 320 with their cutting edges 322 a spring element locking lug 360, which is suitable in the notch 262 of the notch recess 260 of the holding body 200 to lock. For this purpose, the spring element locking lug 360 is bent downwards out of the spring element 300. The spring element 300 moreover has at one of its ends an upwardly bent region in which a recess 380 is located. The busbar 400 has, in addition to its sleeve-like recesses 440 on a pivot bearing end portion 480, which is designed such that it can engage in the recess 380 of the spring element to form a pivot bearing 450.

In Fig. 2b is the assembly process of in Fig. 2a illustrated embodiment of the electrical contact assembly 100 shown. In this case, first the spring element 300 is fixed by means of the spring element latching lug 360 to the latching notch 262 of the notch recess 260 of the holding body 200. Subsequently, the coil 120 is wound on the holding body 200 in the winding section 210 of the holding body 200, and the spool wire ends acting as the line section 142 are guided into the contact region 220 so as to be fastened on the spring element detent 360 Spring element 300 come to rest and lie at least partially above the recesses 320 with their cutting edges 322.

Fig. 2c shows the fully assembled state in the Fig. 2a and 2 B illustrated embodiment of the electrical contact arrangement 100. In this case, the line section 142 between the busbar 400 and the spring element 300 is arranged. By clamping the busbar 400 to the holding body 200, the leaf spring-like spring element 300 is tensioned and the cut edges 322 break through the insulating layer of the line section 142 of the coil wire. Thereby, a reliable and secure mechanical and electrical contact between the bus bar 400 and the line section 142 and thus the coil 120 is produced. The pivot bearing 450 enables a particularly reliable mounting of the bus bar 400 with its sleeve-like recesses 440 on the pins 242. In addition, the connection of the metallic busbar 400 by means of its pivot bearing end portion 480 in the recess 380 of the spring member 300 ensures a particularly reliable and permanent contact between Busbar 400 and the line section 142. For this metal-metal connection between the busbar 400 and the spring element 300 and the intermediate line section 142 is exposed to less aging and stress-related mechanical changes, such as a plastic-metal compound.

In Fig. 2d is a cross section of the holding body 200 in the region of the notch notch 260 of the contact portion 220 shown. The spring element detent 360 of the spring element 300 engages behind the notch 262, whereby the spring element 300 is securely and reliably fixed to the holding body 200. The spring element detent 360 may be formed as a barb-shaped element, which presses in the material of the holding body 200 in the notch 262. In the Fig. 2d In addition, it can be seen how the line section 142 extends over the recesses 320 with their cut edges 322 of the spring element 300, the spring element 300 still having the leaf-spring-like curvature of the unstressed state in the section shown. The mechanical movement of the spring element 300 during clamping of the busbar 400 results in the region of the recesses 320, a vertical and lateral movement of the recess 320 and its cut edges 322 relative to the line section 142, whereby the insulating layer of the line section 142 is reliably broken and whereby the spring element 300th the lead portion 142 reliably contacted electrical.

Fig. 3a FIG. 4 illustrates an exploded view of a third exemplary embodiment. In this case, the line section 142 is wound around the holding body 200 in a plurality of windings in the contact region 220 of the holding body 200. The contact region 220 of the holding body 200 in this case has a substantially round cross-section. The spring element 300 has two clamping arms 390 projecting in a U-shaped manner towards the holding body 200, wherein in the clamping arms 390 essentially circular cutouts 320 are formed with cut edges 322 formed on the edge. At the end of the clamping arms 390 there are spring tabs 392 which project slightly outwardly out of the plane of the clamping arms 390. The clamping arms 390 are substantially rectangular and have at least partially rounded edges. The distance between the two clamping arms 390 is such that the spring element 300 can easily be pushed over the line section 142 designed as a coil element. Two jaws 490 projecting towards the holding body 200 are formed on the busbar 400 at its end facing the spring element 300, wherein the clamping jaws 490, like the clamping arms 390 of the spring element 300, have a U-shaped form. The clamping arms 390 in conjunction with the clamping jaws 490 in this case represent the clamping means by which the busbar 400 is fixed to the holding body 200.

Fig. 3b shows the embodiment Fig. 3a during the assembly process. In this case, the spring element 300 with its clamping arms 390 and its cutouts 320 together with their cut edges 322 in the contact region 220 is pushed over the line section 142 designed as a coil. The spring element is encompassed by the clamping jaws 490 of the busbar 400 and clamped against the line section 142 on the holding body 200. In the illustrated mounting state, the jaws 490 are not yet pushed over the spring tabs 392. By further pushing the busbar 400 with its clamping jaws 490 via the spring tabs 392, the spring element 300 between the jaws 490 and the line section 142 is stretched on the holding body 200, wherein the cut edges 322 of the recesses 320 of the spring element 300 break through the insulating layer of the line section 142 and Thus, an electrical and mechanical contact between the electrically conductive wire inside the line section 142 and the spring element 300 is ensured.

In Fig. 3c is a contact arrangement 100 according to the invention according to the third embodiment to see, in the illustrated figure, the two Line sections 142 of the coil 120 (not visible here) by means of two spring elements 300 and two busbars 400 are contacted. The two busbars 400 and the respectively associated spring elements 300 are clamped from opposite sides of the holding body 200. An electrical contact arrangement 100 produced in this way has a particularly secure contact, since the line section 142 is guided around the holding body 200 in the contact region 220 in a plurality of windings and thus the contact surface between the spring element 300, its cut edges 322 and the line section 142 is ensured over a particularly large area. In addition, the contact assembly 100 thus produced can be mounted particularly simply by simply pushing the clamping jaws 490 of the busbar 400 over the clamping arms 390 of the spring element 300, after the clamping arms 390 of the spring element 300 have previously been pushed over the line section 142 in the contact section 220. Finally, the winding of the electric coil 120 (not shown here) and the contact areas 320 wrapped with the line section 142 are particularly easy, since during the winding process no imbalance can occur due to additional, detachable mechanical parts.

The spring elements 300 for all embodiments are preferably produced as metal stamped and bent parts. The cutting edges 322 on the recess 320 in the spring element 300 preferably have a bending radius RS, which is significantly smaller than the radius of the insulating layer RI of the electric wire 140. This ensures that the Pressing operation of the spring element 300 by means of the busbar 400, the cutting edge 322 breaks through the insulating layer of the line section 142 safely and so a reliable electrical and mechanical contact between the spring element 300 and the line section 142 is ensured.

The holding body 200 is preferably produced by an injection molding process, it being possible to use thermoplastics as well as thermosets as the material. The busbar 400 is preferably made of metal, more preferably brass, bronze, steel, a steel alloy, copper or aluminum. The busbar 400 preferably has a galvanically finished surface, a so-called galvanic surface. The surface refinement of the busbar 400 serves in particular as protection against corrosion. However, the busbar can also be made of a conductive plastic, which significantly reduces the manufacturing costs.

The electrical contact arrangement 100 according to the invention is suitable for contacting coils 120, for example for use in a rotational speed sensor, preferably in an exhaust gas turbocharger. However, applications are also conceivable in the contacting of coils for actuators such as e.g. Solenoid valves, injectors or electrical couplings, which are operated with a coil. In particular for applications in the automotive sector or in technical areas in which only a small installation space is available, the electrical contact arrangement 100 according to the invention is suitable for use.

Claims (10)

1. Electrical contact arrangement for contacting a coil (120), comprising a retaining body (200), the retaining body (200) being electrically insulating, a line segment (142) of at least one electrical line (140), the electrical line (140) being surrounded by an electrical insulating layer, at least one spring element (300), the at least one spring element (300) being electrically conducting, the at least one spring element (300) having at least one opening (320), at least some regions at the edge of the at least one opening (320) forming a cutting edge (322), the at least one spring element (300) having been pressed with the at least one cutting edge (322) against the line segment (142) in such a way that the at least one cutting edge (322) has penetrated the electrical insulating layer and an electrical contact has been established between the at least one spring element (300) and the at least one line segment (142), characterized in that at least one bus bar (400) is provided, the at least one bus bar (400) being electrically conducting and the retaining body (200) and/or the at least one bus bar (400) being provided with clamping means (240), the bus bar (400) being securely clamped on the retaining body (200) by means of the clamping means (240) and as a result the spring element (300) is clamped between the bus bar (400) and a contact region (220) of the retaining body (200), and in this manner the at least one line segment (142) has been brought into electrical contact with the at least one bus bar (400) by means of the at least one spring element (300).
2. Electrical contact arrangement according to Claim 1, characterized in that the at least one spring element (300) is produced as a flexible spring from a metal strip and in that the at least one spring element (300) has been brought into direct electrical contact with the at least one bus bar (400).
3. Electrical contact arrangement according to either of Claims 1 and 2, characterized in that the at least one bus bar (400) is detachably connected to the retaining body (200).
4. Electrical contact arrangement according to one of Claims 1 to 3, characterized in that the contact region (220) has a snap indentation opening (260) having at least one snap indentation (262), in that the at least one spring element (300) has at least one spring element snap nose (360) and in that, for fixing on the retaining body (200), the at least one spring element (300) engages in the snap indentation opening (260) by means of the at least one spring element snap nose (360) and engages behind the at least one snap indentation (262).
5. Electrical contact arrangement according to one of Claims 1 to 4, characterized in that the at least one bus bar (400) engages at the end in an opening (380) in the at least one spring element (300) to form a pivot bearing (450) for the at least one bus bar (400).
6. Electrical contact arrangement according to one of Claims 1 to 5, characterized in that the clamping means (240) are formed on the retaining body as at least one pin (242), at least one socket-like opening being formed in the at least one bus bar (400) in such a way that the at least one pin (242) is accommodated in the at least one socket-like opening (440), a non-positive connection being formed between the at least one pin (242) and the at least one socket-like opening (440).
7. Electrical contact arrangement according to one of Claims 1 to 3, characterized in that the at least one spring element (300) has at least one flexible clip (340), the at least one flexible clip (340) being bent around the at least one bus bar (400) in such a way that the at least one spring element (300) is fixed on the at least one bus bar (400).
8. Electrical contact arrangement according to one of claims 1 to 3, characterized in that the at least one spring element (300) has two clamping arms (390) that project towards the retaining body (200) and enclose the retaining body (200) at least in some regions in the contact region (220), the clamping arms (390) having spring clips (392) at the ends, and the at least one bus bar (400) having two clamping jaws (490) that project towards the retaining body (200), and in that the at least one bus bar (400) has been pushed with its clamping jaws (490) over the clamping arms (390) of the at least one spring element (300) in such a way that the spring clips (392) are tensioned between the clamping jaws (490) and the retaining body (200).
9. Electrical contact arrangement according to one of Claims 1 to 8, characterized in that the at least one line segment (142) is arranged between the retaining body (200) and the at least one spring element (300) or in that the at least one line segment (142) is arranged between the at least one spring element (300) and the at least one bus bar (400).
10. Use of an electrical contact arrangement according to one claims 1 to 9 in a rotational speed sensor for sensing the rotational speed in an exhaust gas turbocharger.

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