EP2460165B1 - Connection device for a coil of an electromagnetic switching device - Google Patents

Description

The invention relates to a connection device for a coil of an electromagnetic switching device having a contact-containing switching region and a drive region having an armature, a coil and a yoke, wherein the contacts of the switching region are in operative connection with the drive region.

Such a connection device is known from EP 0 394 833 known. This terminal device comprises a terminal base mounted on the bobbin and a terminal plate including an electrically conductive plate and having a first end portion with a first bent portion and a second end portion with a second bent portion. Both areas are connected via a central area. In this case, the first bent portion is provided with a Anwickelstift to connect the connection plate with the excitation coil. The second end portion includes means for connecting the terminal plate to the outer conductor. The first bent portion is perpendicular to the central portion of the terminal plate, and the first and second bent portions each include first and second projections. Furthermore, the connection device comprises a device for attaching the connection plate to the connection base. This consists in a first recess formed in the terminal base to receive the first bent portion and a second recess in the terminal base for receiving the second bent portion. Projections on the surface of the bent portions, which are perpendicular to the central region, are formed such that a firm attachment of the bent portions in the recesses is achieved. The central area is received in a groove of the terminal base.

From the DE 91 10 706 U1 a connection device for connecting an end portion of a coil with an outer conductor can be removed, wherein the excitation coil is mounted on a bobbin, comprising a first fastening mandrel with a recess. In addition, this connection device has a fastening for receiving a contact piece. There is the possibility of the optional inclusion of various connections, using a vending machine production.

The EP 0 860 016 B1 describes a bobbin with an excitation coil, which is part of an electromagnetic switching part, wherein on a flange of the bobbin, a connection device is mounted with terminals, via the outer conductor can be connected to the end portions of the exciting coil. The connecting device comprises a plate with a first fastening mandrel, which has a first recess, and a second fastening mandrel with a second recess and optionally with a third recess, which merges into a breakthrough. Furthermore, the connecting device includes an at least partially electrically conductive connection plate which has a first bent region at the end and a second region which is bent toward the same side. The connection plate may be provided with a connection screw over a borehole or have on its side facing away from the bent areas a projecting tongue which carries a spring clip for connection of the outer conductor. The connection plate is inserted over its bent areas in the first recess and in the second or third recess. The first bent portion is provided with a Anwickelstift and end-like tooth-like, in order to obtain a tight fit when inserted into the first recess of the first mounting mandrel.

The disadvantage of the known from the prior art embodiments for coil connections in an electromagnetic switching device is that the contact between Drive area and bobbin by a rigid element, such as a pin, is achieved, which does not compensate for the dynamics of the drive unit, so that the surfaces of the joints can be damaged by switching movements.

The EP 0 198 099 A1 discloses a connection device for a coil of an electromagnetic switching device having a contact-having switching region and a drive region having an armature, a coil and a yoke, wherein the contacts of the switching region are in operative connection with the drive region and wherein the contact between the drive region and coil via a Spring clip is formed.

US2005 / 0190024 A1 discloses a connecting device for a coil according to the preamble of claim 1.

Documents JP 52022559 U1 and US2006 / 0132268 A1 disclose examples of other connection devices for a coil.

Accordingly, the object of the present invention is to provide a connection device for a coil of an electromagnetic switching device, which enables a secure electrical contact between the coil and the drive region and thereby produces a lower material wear during switching operations.

This object is achieved by a connection device with the features of claim 1. Advantageous embodiments and developments, which can be used individually or in combination with each other, are the subject of the dependent claims.

The connecting device according to the invention for a coil of an electromagnetic switching device having a contact-containing switching region and a drive region having an armature, a coil and a yoke, wherein the contacts of the switching region are in operative connection with the drive region, characterized in that the contact between Drive region and coil is formed via a formflexibles connection element. According to the invention, it is provided that the contacting of the coil contact to the drive unit (AC / DC) is achieved by an additional element which compensates for the dynamics of the drive unit. This element can be designed connection and drive neutral. The formflexible connection element according to the invention is thus way balancing and is designed as a compression spring. These spring elements are preferably tolerance compensating and compensating path.

According to the invention, the drive region contacts the connection element via a pin with a wavy contour. Due to this form a smooth assembly, high tolerance insensitivity of the parts and a very secure hold of the spring under all tolerance positions can be guaranteed. A light and secure mounting of the spring is particularly advantageous if the switching and drive unit is separated for a bobbin change. Both during assembly and repair of the device as well as the bobbin change, a smooth and secure functionality of the connecting element according to the invention is ensured. Another particular advantage is that the resulting movement of the switching unit and drive unit due to the dynamics of the switching unit can be compensated by the contact between coil terminal and coil.

The connecting device according to the invention for a coil of an electromagnetic switching device enables a secure electrical contact between the coil connection and the drive unit, wherein the flexibility of this device means that the material wear during switching operations is minimized. In addition, the connecting element according to the invention is kept neutral with respect to the connection technology and the drive technology, that is, with the use of this element, a variant reduction is connected. Due to the insensitivity to the tolerance layers of the individual parts in the insertion direction accurate positioning of the modules to each other during assembly is no longer necessary. This has the advantage that the surfaces to be contacted can be geometrically kept very simple.

Further advantages and embodiments of the invention will be explained below with reference to embodiments and with reference to the drawing.

Here are shown schematically:

• Fig. 1 in a sectional view of a coil connection according to the invention of an electromagnetic switching device;
• Fig. 2 in a sectional view an electrically conductive connection pin;
• Fig. 3 in a sectional view the connection pin after Fig. 2 with formflexible connection element.

Fig. 1 shows a coil terminal 1 according to the invention, which is preferably designed in two parts and has an electrically conductive terminal pin 2 and a formflexibles connection element 3, preferably a pressure or leaf spring. The formflexible connection element 3 is plugged onto the electrically conductive connection pin 2. This two-part coil connection is arranged in a housing upper part 4. Below the upper housing part 4, a coil 5 is arranged. The coil 5 has two electrically conductive connection plates 6, 7, which allow direct contact with the form-flexible connection elements 3. The direct contact is made by support, since the spring elements used are under tension and so always a reliable support contact is ensured. Between the coil terminals 1, a contact bridge carrier 8 is arranged for the contact system of the switching area. The coil terminals 1 are installed between housing guides 9, 10, which serve in particular to align the form-flexible connection elements 3.

Fig. 2 shows an electrically conductive connection pin 2 with a preferably wave-shaped connection contour 11 for the formflexible connection element. 3

In Fig. 3 the coil terminal 1 according to the invention of electrically conductive terminal pin 2 and attached formflexiblen connection element 3 is shown. Due to the wave-shaped connection contour 11, the connection element 3 a slightly curved course, which is adjustable in the installed state by the housing guide 9, 10.

The connecting device according to the invention for a coil of an electromagnetic switching device allows a secure electrical contact between the coil terminal and the drive unit, wherein the flexibility of this device means that the material wear is minimized during switching operations. In addition, the connecting element according to the invention is kept neutral with respect to the connection technology and the drive technology, that is, with the use of this element, a variant reduction is connected. Due to the insensitivity to the tolerance layers of the individual parts in the insertion direction accurate positioning of the modules to each other during assembly is no longer necessary. This has the advantage that the surfaces to be contacted can be geometrically kept very simple.

Claims (3)

1. Terminal device for a coil (5) of an electromagnetic switching device having a switching region that has contacts and a driving region that has an armature, a coil (5), and a yoke, wherein the contacts in the switching region are operatively connected to the driving region, wherein contacting between the driving region and coil (5) is embodied by way of a form-flexible terminal element (3), wherein the terminal element (3) is a pressure spring, characterised in that the driving region contacts the terminal element (3) via a terminal pin (2) having a wave-shaped contour (11), and the form-flexible terminal element (3) has been plugged onto the electrically conducting terminal pin (2).
2. Terminal device according to claim 1, characterised in that the terminal element (3) is embodied as being tolerance equalising.
3. Terminal element according to one of the preceding claims, characterised in that the terminal element (3) is embodied as being displacement compensating.

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