EP2293390B1 - Electrical connection between the housing of a coil winding and a board - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to an electrical connection between a winding material arranged in a housing and printed conductors of a printed circuit board, which has the features of the preamble of patent claim 1.

STATE OF THE ART

In particular, inverters often have a plurality of chokes, which are in electrical connection with a respective circuit board. The throttles are in this case housed in housings, in particular pot-like housings, the pot-like housings having contact pins which are connected to the inductor winding. As already stated, inverters often have several reactors. It is now known to install the reactors of the inverter in the housing of the inverter, then install the board and then screw the two parts together. The screwing is done in detail by the fact that a plurality of sockets are provided on the housing of the winding material, record the pins, wherein the pins are arranged to be movable in the bushes in the longitudinal direction. These pins have an internal thread. On the board itself Stützfüßchen are arranged, which are in communication with the corresponding tracks on the board. These support feet have on their top a bore for receiving a screw to connect by means of such a screw, the contact pins with the support feet. That is, the pins are screwed against the board. Such a choke usually has four pins for connection to the board.

As stated elsewhere, an inverter usually has multiple chokes that must be connected to the board. To now ensure that the Contact pins are aligned with the support feet on the board, an extremely accurate production and assembly is necessary, otherwise a contact is not possible, if it should not come to damage, especially on the board.

From the US 5,055,055 A An electrical connection for the transmission of large currents is known. In this case, a bearing bush has a bore into which a longitudinally slotted in a central region longitudinally and there retracted in its radius spring bush is pressed. This spring bushing engages with its smallest inner diameter portion of a cylindrical portion of a contact pin, which is so mounted within the bore of the bearing bush under elastic deformation of the spring bushing around the waist pivotally.

From the US 5,334,035 A an electrical connector for forming a multi-pole electrical connection is known in which each contact element for a contact pin has a socket for receiving the contact pin, which is pivotable about an axially offset to the rear point in order to align with the longitudinal axis of the contact pin can ,

From the US 5,482,470 A a multi-pole electrical connection between a plug and a socket is known in the contact pins are indeed rigidly supported at an axial distance to a contact region in the radial direction, but even before the contact area against the stop so formed in the radial direction can be elastically deflected to himself to align with them receiving contact elements.

OBJECT OF THE INVENTION

The object underlying the invention is to provide a tolerance compensation in an electrical connection of the type mentioned in such a way that even with not aligned arrangement of the parts to be contacted mounting is easily possible.

SOLUTION

To achieve the object, an electrical connection with the features of claim 1 is proposed according to the invention.

The idea underlying the invention is therefore, by a floating bearing, which means that the pin is laterally movable, to ensure that with appropriate manufacturing inaccuracies of the pin can still be brought into contact with the contact element of the board. This is achieved by a so-called "floating" storage ", in which the pin by a certain amount by the bearing pivotally, that is laterally movably receivable.

Advantageous features and further embodiments can be found in the dependent claims.

DESCRIPTION OF THE INVENTION

Thus, according to one embodiment, it is provided that the bearing bush has a plurality of resiliently engaging retaining arms acting radially on the circumference of the pin, wherein the pin is held laterally movably in the bearing bush against the retaining arms. It is essential here that the bearing bush has a radial play, in order to ensure that the elastically yielding retaining arms can actually deflect laterally when pivoting of the pin occurs in the bearing bush.

According to one embodiment, it is provided that the pin on the circumference has a tangential circumferential groove, in which engage the retaining arms. In this case, provision is made in particular for the holding arms to each have a collar at the end, which engages in the groove of the pin. In particular, when the groove in the pin has an axial extent which is greater than the collar of the respective holding arm, a displacement of the pin parallel to its longitudinal axis is possible. This means that not only a tolerance compensation in the radial direction is possible by pivoting the pin, but also in the axial direction of the pin.

For further centering of the contact pin in the bearing bushing centering fingers are provided above the support arms in the bearing bush. Several such circumferentially distributed around the pin grouped centering fingers additionally ensure centering of the pin substantially perpendicular to the top of the bearing bush.

As already explained elsewhere, each pin is on the one hand with the winding material, and on the other hand with the board by a contact element in electrical connection. The formation of such a contact element is advantageously made according to a feature of the invention such that the contact element is designed as a spring wreath. Such a spring ring advantageously comprises a plurality of circularly arranged spring tongues, which contact the pin end. The spring tongue itself is in this case attached directly to the board, wherein it is advantageously provided according to an embodiment that the spring tongues are arranged in a cylindrical housing on the board. When inserted pin, the spring tongues are radially on the inner wall of the housing, d. h., The spring tongues are supported at the end resiliently on the housing inner wall, resulting in that the pin is in good electrical contact with the spring tongues. By such a tight fit of the spring tongues on the pin a stable seat of the pin is also effected in the contact element formed by the spring tongues in connection with the housing surrounding the spring tongues.

According to the prior art, it was so that the so-called "Stützfüßchen" are provided for electrical connection of the contact pin with the board, which are connectable by means of screws with the pin. Such a screw connection requires that the screw with its screw head is accessible from the outside. That is, with a contact of the type according to the invention and assemblies of throttles on boards to screwdriver or tool generally inaccessible places are possible because the pins must be inserted only in the spring ring. The contacting according to the invention is also relatively quick to carry out, since this is a tool-free contacting. Furthermore, the contact is extremely stable without burdening the board, as on the one hand by the floating bearing of the pin and on the other hand by the contact of the pin through the spring ring shocks can be largely intercepted, without being transmitted to the board. The contacts can not solve either, so that for this reason such an electrical connection is extremely safe. Furthermore, there is no risk to forget a screw during assembly, since - as already stated - the electrical contact is already made directly when the throttle is installed with its housing in the inverter. It thus eliminates the separate contact of the pins with the Kontaktfüßchen, as has been described. In this respect, this also increases the mounting security.

The invention also provides an inverter, comprising at least one electrical winding material and at least one circuit board with an electrical connection between the winding material and the circuit board according to one or more of the previously discussed features.

BRIEF DESCRIPTION OF THE FIGURES

Fig.1

zeigt die Art der Verbindung nach dem Stand der Technik;

Fig. 2

zeigt die erfindungsgemäß Lagerung des Kontaktstiftes in der Lagerbuchse in einer Seitenansicht im Schnitt;

Fig. 3a

zeigt die Ausbildung des Federkranzes zur Kontaktierung des Kontaktstiftes auf der Platine;

Fig. 3b

zeigt den Federkranz in dem zylindrischen Gehäuse im Schnitt;

Fig. 4

zeigt schematisch das Wickelgut im mit der Platine verbundenen Zustand.

With reference to the drawings, the invention will be explained in more detail below by way of example.

Fig.1

shows the type of connection according to the prior art;

Fig. 2

shows the inventive storage of the contact pin in the bearing bush in a side view in section;

Fig. 3a

shows the formation of the spring ring for contacting the contact pin on the board;

Fig. 3b

shows the spring ring in the cylindrical housing in section;

Fig. 4

schematically shows the winding material connected to the board state.

DESCRIPTION OF THE FIGURES

According to FIG. 1 the prior art is shown as it is made for electrically contacting a throttle with a circuit board. The housing of the throttle is designated 1. In the housing of the throttle sits with the designated bearing bush 2, which receives the contact pin 3 longitudinally displaceable. For this purpose, the contact pin 3 has a collar 3a which is seated in a corresponding groove 2a of the socket 2. The generally designated 5 board shows the Stützfüßchen 6, each of which serves to receive the screw 7, which is screwed into the frontal internal thread of the pin 3, and insofar makes the contact between the Stützfüßchen 6 on the one hand and the contact pin 3 on the other. The electrical connection of the contact pin 3 with the winding of the throttle is not shown.

It can be seen that the internal thread of the pin 3 must be flush with the hole in the Stützfüßchen 6, the connection between the housing 1 of the winding material and the board done. If the two parts, so the socket of the housing and the support legs with the hole for the screw on the board, not aligned with each other, so a connection can not be made. Rather, it must then be reworked to allow such a connection in the end, or the screw is clamped against the board. In the illustration of a first embodiment of a floating storage according to FIG. 2 the bearing bushing designated 2 is formed on the housing 1 such that it has an upper opening 10 from which the pin 3 exits. In the bearing bush 2 and in the opening 10 of the bearing bush holding arms 12 are arranged, the end having a collar 13, wherein the collar 13 engages in the groove 3 a of the pin 3. It is essential here that the collar 13 is smaller in height than the length of the groove 3 a, so that the pin is movable axially in the direction of the double arrow 20.

Furthermore, at the upper end of the opening 10 of the bearing bush 2, circumferentially distributed, a plurality of centering fingers 15 are arranged, which due to their inherent elasticity keep the pin 3 centrally approximately centrally, as can be seen in FIG FIG. 2 results. The individual fingers 15 have a distance X to the side wall of the bearing bush 2, wherein the distance X finally defines the angle at which the pin 10 can be pivoted in accordance with the double arrow 25. Since the retaining arms 12 are formed resiliently, and can also move laterally, a corresponding to the edge of the socket with the distance X distance Y is provided, so that also the mobility of the pin 3 is given.

It should be noted at this point that the centering fingers 15 serve only the better centering. The actual floating bearing is provided by the support arms 12 in the bearing bush. That is, the centering fingers 15 align the pin 3 perpendicular to the top of the socket so that it enters the corresponding opening in the board.

The contact of the pin 3 on the board 5 is effected by the spring ring 40. The pin 3, which is held at the lower end by the bearing bush 2, protrudes in the upper region in the spring ring 40 and projects beyond this with its tip. The spring ring 40 consists of individual spring tongues 41, which are arranged in a circle on the board around the pin 3 around and are formed conically tapered to each other. The spring tongues are connected to the printed conductors of the board. The spring tongues 41 have end projections 41 a, with which the spring tongues 41 on the inner wall of the cylindrical Housing 45 ( FIG. 3b ) abut resiliently when protruding into the spring ring of the pen. This means that the spring tongues 41 are pressed against the spring force to the outside during the passage of the pin 3 by the spring ring, so that a secure electrical contact of the pin is given by the spring ring 40 to the board 5.

Claims (14)

1. Electrical connection between a coiled object arranged in a housing (1) and conductors of a circuit board (5), the electrical connection including a plurality of contact pins (3) which are arranged at the housing (1), wherein each contact pin (3) is in electrical contact with the coiled object on the one hand and via a contact element (40) with the circuit board (5) on the other hand, wherein for each contact pin (3) a bearing bushing (2, 30) is provided at the housing (1) which holds the contact pin in a floating way, characterised in that the bearing bushing (2, 30) comprises a plurality of elastically resilient holding arms (12) radially engaging the circumference of the contact pin (3), wherein the contact pin (3) is held by the bearing bushing (2) laterally movable against the holding arms (12), and that a plurality of elastically resilient centring fingers (15) distributed over the circumference of the contact pin (3) are arranged within the bearing bushing (2) above the holding arms (12).
2. Electrical connection of claim 1, characterised in that the contact pin (3) is held by the bearing bushing (2, 30) in a swivelling way.
3. Electrical connection of any of the preceding claims, characterised in that the contact pin (3) is held by the bearing bushing (2, 30) in a way that it is movable parallel to the longitudinal axis of the contact pin (3).
4. Electrical connection of any of the preceding claims, characterised in that the centring fingers (15) align the contact pin (3) perpendicular to the upper side of the bearing bushing (2).
5. Electrical connection of any of the preceding claims, characterised in that the contact pin (3) comprises a groove (3a) at its circumference into which the holding arms (12) engage.
6. Electrical connection of claim 5, characterised in that the holding arms (12) each comprise a flange (12a) at their ends which engages into the groove (3a) of the contact pin (3).
7. Electrical connection of claim 6, characterised in that the axial extension of the groove (3a) is larger than the height of the flange (12a) of the respective holding arm (12) to ensure the axial movability of the contact pin (3) within the bearing bushing (2).
8. Electrical connection between the housing (1) of a coiled object and a circuit board (5) of any of the preceding claims, characterised in that the contact element is made as a spring collar (40).
9. Electrical connection between the housing (1) of a coiled object and a circuit board (5) of claim 8, characterised in that the spring collar (40) comprises a plurality of flexible tongues (41) in a circular arrangement, which contact the contact pin (3) with their ends.
10. Electrical connection between the housing (1) of a coiled object and a circuit board (5) of claim 9, characterised in that the flexible tongues (41) are fixed to the circuit board (5).
11. Electrical connection between the housing (1) of a coiled object and a circuit board (5) of claim 9, characterised in that the flexible tongues (41) are in electrical contact with a conductor of the circuit board (5).
12. Electrical connection between the housing (1) of a coiled object and a circuit board (5) of claim 9, characterised in that the flexible tongues (41) are arranged in a cylindrical housing (45) on the circuit board (5).
13. Electrical connection between the housing (1) of a coiled object and a circuit board (5) of claim 12, characterised in that, with introduced contact pin (3), the flexible tongues (41) are radially supported at the inner wall of the housing (45).
14. Inverter comprising at least one electrical coiled object and at least one circuit board (5) with an electrical connection between coiled object and circuit board (5) according to one or more of the claims 1 to 13.

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