EP0179259B1 - Bobbin - Google Patents

Description

The invention relates to a coil former according to the preamble of claim 1, such a coil former is known from US-A-3 932 828.

In the bobbin known from US-A-3 932 828, the plastic bracket is firmly formed on the one end flange in such a way that the one sleeve ends of the connecting sleeves projecting beyond the operational inside of the plastic bracket lie radially above the winding space and the winding is introduced into the winding space , especially when using automatic winding machines. The connecting sleeves themselves are inserted from the operational outside of the plastic bracket into the fitting openings with a larger opening diameter on this side; A protection against train through the outer connection lines is at most by a flap to be made after inserting the connection sleeves at the end of the connection sleeves protruding beyond the operational inside of the plastic bracket. To secure the connection sleeves against slipping when plugging in from the operational outside of the plastic bracket, a bead is to be attached separately to the connection sleeves, which comes to rest on a stepped shoulder at the inner end of the fitting opening part with the larger opening diameter. For the insulating covering of the free ends of the connection sleeves projecting over the winding space, an insulating capsule is slipped on axially.

In a further coil former known from DE-A-2 758 700, tongue-shaped plugs are simultaneously cast in during the injection molding of the hinge-like molded plastic bracket; In the operating position of the plastic bracket folded over the hinge axis about its hinge axis on one end flange and locked on the other end flange, the winding ends of the excitation coil wrapped in the coil former are connected to the radially inward projecting inner connection ends; A plug connected to an outer connecting line can be plugged onto the radially outwardly projecting outer connecting ends of the injected connecting pins.

According to the object of the present invention, the manufacture of the bobbin and the reliable strain-relieved contact between the winding ends of the coil wound on the bobbin on the one hand and the line ends of the outer connecting line on the other hand, in particular with regard to automated manufacturing and assembly, are to be simplified.

This object is achieved in a bobbin of the type mentioned at the outset by teaching the first part of claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

According to the invention, the bobbin with the hinge-like molded plastic bracket can first be produced in a technically simple manner as a simple injection-molded universal part without connecting sleeves to be held in the mold and adjusted and injected; The connection sleeves can then be inserted into the e.g. the injected fitting openings of the plastic bracket are pressed in from its operational inside and the one sleeve ends protruding from the operational inside of the plastic bracket are wrapped mechanically with the winding ends of the winding applied to the coil former.

The stripped ends of the outer connecting leads, which can be inserted into the connection sleeves from the top of the laterally folded away plastic bracket parallel to the end face of the coil former without stressing a large assembly space, can be contacted with the connection sleeves in a particularly simple manner by following the outstanding one sleeve ends wrapped around the winding ends are immersed in a solder bath directed below, whereby the liquid solder material rises up to the stripped ends of the outer connecting leads inserted into the connecting sleeves due to the capillary action, and thus they are also securely contacted with the connecting sleeves in the same operation. A particularly simple and yet fully effective strain relief in terms of production and assembly technology is achieved in that, with a corresponding pull acting on the outer connecting lines, the connecting sleeves fit positively against the stop formed by the fitting opening part with the smaller clear width. This eliminates the need for an additional support bead on the connection sleeves and at the same time ensures a particularly good strain relief, since the simple cylindrical connection sleeve rests against the pulling direction of the outer connection lines on the step-shaped heel of the fitting opening part with the smaller fitting opening part. At the same time, an insulated routing of the outer connection lines out of the plastic bracket is ensured if it is ensured that the stripped end of these connection lines is shorter than the hole depth of the fitting opening part with the smaller clear width.

In order to ensure a particularly good strain relief and accordingly to ensure a particularly good mechanical fixation of the connection sleeves in the plastic bracket which is folded back over the winding after the connection has been made and locked on the other end flange, it is provided that the connection sleeves are slotted in the longitudinal direction, so that they are a small amount spring up in the circumferential direction and can thus be inserted under tension into the fitting openings. In addition, according to a further embodiment of the invention, it is provided that for further mechanical fixation, the outer surfaces of the connection sleeves are provided with a raster embossing in their area inserted into the plastic bracket, which engraves into the surrounding softer plastic of the plastic bracket when the connection sleeves are inserted.

By the greatest possible distance and thus To ensure good free accessibility of the thread holder guide to the one sleeve end protruding from the plastic bracket, it is provided to reduce the connecting sleeves in the area of their protruding one sleeve end to circular sleeve-shaped parts and to arrange such a mutual arrangement of several residual sleeve parts within a plastic bracket that the circular segment-shaped Remaining sleeve wall parts are arranged in the plastic bracket with the greatest possible mutual spacing; At the same time, there is a simple separation option between the winding ends of the finished wound bobbin and the remaining winding wire held by the thread guide on the sharp peripheral edges of the circular sleeve-shaped remaining sleeve wall parts.

• Fig. 1 im Teil-Schnittbild gemäss Schnittverlauf I-I in Fig. 2 einen Spulenkörper mit seitlich weggeklapptem Kunststoffbügel, darin eingedrückten Anschlusshülsen und daran angeschlossenen Wicklungsenden;
• Fig. 2 die Oberansicht des weggeklappten Kunststoffbügels in Fig. 1;
• Fig. 3 im Längsschnitt gemäss Schnittverlauf 111-111 in Fig. 4 eine einzelne Anschlusshülse;
• Fig. 4 eine Hauptansicht einer einzelnen Einsteckhülse;
• Fig. 5 eine stirnseitige Draufsicht auf eine einzelne Einsteckhülse gemäss Fig. 4;
• Fig. 6 den gegenüber Fig. 1 um 180° gedrehten Spulenkörper mit in ein Lötbad eingetauchten, aus dem Kunststoffbügel herausragenden einen Hülsenenden;
• Fig. 7 in Seitenansicht den komplettierten Spulenkörper mit in Verraststellung umgeklapptem Kunststoffbügel;
• Fig. 8 eine stirnseitige Draufsicht auf den komplettierten Spulenkörper gemäss Fig. 7.

The invention and further advantageous embodiments of the invention are explained in more detail below with reference to a schematically illustrated embodiment in the drawing. In it show:

• 1 is a partial sectional view according to section II in FIG. 2, a coil former with a plastic bracket folded away to the side, connector sleeves pressed therein and winding ends connected thereto;
• Figure 2 shows the top view of the folded away plastic bracket in Fig. 1.
• 3 shows a single connecting sleeve in longitudinal section according to section 111-111 in FIG. 4;
• Fig. 4 is a main view of a single insertion sleeve;
• FIG. 5 shows an end view from above of a single insertion sleeve according to FIG. 4;
• 6 shows the bobbin rotated by 180 ° with respect to FIG. 1, with one sleeve end protruding into a solder bath and protruding from the plastic bracket;
• 7 shows a side view of the completed bobbin with the plastic bracket folded down in the locked position;
• 8 is a frontal top view of the completed bobbin according to FIG. 7.

1 shows a partial sectional view of an annular plastic coil former 1, the winding space of which is axially delimited by a circumferential end flange 11 or 12 and a coil base 13. An excitation winding 6, e.g. a stepper motor, wrapped. A plastic bracket 2 is integrally molded onto the radially outer edge of the right end flange 11 of the coil former 1 via a hinge-like joint. After the winding connection, the plastic bracket is folded to the left about its hinge joint over the winding 6 and locked by means of molded-on locking cams 27 with locking webs 14 integrally formed on the left end flange 12 and fixed in this way in its operational position shown in FIGS. 7 and 8.

To make contact between the winding ends 61, 62, 63 of the excitation coil 6 and the outer connecting lines 7, 8, 9, three connecting sleeves 3, 4, 5 are inserted into the plastic bracket 2 in correspondingly cast-in fitting openings from the operational inside 28 of the plastic bracket 2. The fitting openings each consist of a first fitting opening part 21 or 23 or 25, which is open to the operational inside 28 of the plastic bracket 2, with a larger clear width and relatively large bore depth, and a second fitting opening part 22 or 24 or 26 with a smaller clear width in the Proximity to the operational outside 29 of the plastic bracket 2. The fitting openings designed in this way on the one hand achieve that the connecting sleeves 3 or 4 or 5 when inserted against the shoulder formed by the second fitting opening part 22 or 24 or 26 with its smaller clear width come to rest and are thus positively secured against a tensile load by the outer connecting lines 7, 8, 9 to be introduced and contacting from the outside 29 of the plastic bracket 2 and, on the other hand, the outer connecting lines 7, 8, 9 are insulated and inserted into the connecting sleeves 3, 4, 5 can, if their stripped ends 71, 81, 91 n are not longer than the hole depth of the second fitting opening parts 22 or 24 or 26.

2 shows the three sleeve ends of the connecting sleeves 3, 4, 5 protruding from the inside 28 of the plastic bracket 2, the protruding one sleeve ends being reduced to residual sleeve wall parts 31, 41 and 51 in the form of a segment of a circle. The remaining sleeve wall parts 31 or 41 or 51 are mutually arranged such that there is a maximum distance between them and thus the greatest possible free space for the winding thread holder when wrapping the remaining sleeve wall parts 31 or 41 or 51 with the winding ends 61 or 62 or 63 of the excitation coil 6 results. At the same time, it should be evident that the sharp peripheral edges of the circular-segment-shaped remaining sleeve wall parts 31, 41 and 51, in a simple manner, by means of a small additional pull, do not allow a separation between the winding ends and the remaining winding thread holder held.

3 to 5 show a single connecting sleeve 3 with its residual sleeve wall part 31 protruding from the inside 28 of the plastic bracket 2, with the axial longitudinal slot 32, through which the sleeve wall springs open and thus is pressed into the corresponding fitting opening 21 of the plastic bracket 2 is guaranteed and with the additional raster embossing 33 provided on the outer surface of the sleeve wall part to be pressed in.

After the winding ends 61 or 62 or 63 are advantageously wrapped around the circular-segment-shaped remaining sleeve wall parts 31 or 41 or 51 in the plastic bracket 2 which has been folded away to the side and are pre-contacted with the connecting sleeves 3, 4, 5 in this way - if 1 - the coil body expediently rotated by 180 °, so that the remaining sleeve wall parts wrapped around the winding ends can be easily immersed in an immersion solder bath 10, as can be seen in FIG. 6. The previously stripped ends 71 and 81 and 91 into the connection sleeves 3, 4, from the operational outside of the plastic bracket 2 according to FIG. 6, parallel to the end flange 12, the outer connection lines are automatically also electrically connected and mechanically fixed to the inner wall parts of the connection sleeves because of the capillary action of the sleeves the liquid solder material in the sleeves rises up to the stripped ends of the outer connection cables.

Fig. 7, 8 shows the completed bobbin 2 after it has been pivoted to the other end flange of the bobbin 1 and fixed to it by latching after making the electrical and mechanical connection between the winding ends and the outer connecting lines via the winding 6.

Claims (6)

1. Bobbin having U-shaped winding space for a coil (6), which space is open radially outwards and limited axially by front flanges (11, 12), as well as having a plastic clip (2) pre-formed on the one front flange (11) with connection means (3-5) supported therein in one piece for the purposes of connection of outer connection lines (7-9), on the one hand, and winding ends (61-63) of the coil (6), on the other hand, in which case connection sleeves (3-5) are inserted into stepped fitting openings (21-26), passing through radially, in the plastic clip (2) as connection means and are fixed, the winding ends are, in each case, wrapped around said sleeves' one lot of ends projecting from the operational inside of the plastic clip and bared ends of the outer connection lines are inserted into said sleeves' other ends from the operational outside of the plastic clip (2) and contacted, characterised by the following features:

a) the fitting openings (21-26) have, in each case, close to the operational outside (29) of the plastic clip (2) a set-off reduced inside width;

b) the connection sleeves (3 or 4 or 5) are pressed from the inside (28) of the plastic clip (2) into the first fitting opening part (21 or 23 or 25) with the greater inside width as fas as the stop on the second fitting opening part (22 or 24 or 26) with the smaller inside width;

c) the plastic clip (2) is pre-formed on the one front flange (11) in a hinge-like manner in such a way that it may be swung, on the one hand, for the purposes of contacting the connection sleeves (3 or 4 or 5) with the winding ends (61 or 62 or 63) of the coil (6) laterally away from the winding space and, on the other hand, may be swung back over the winding space and be fixed on the other front flange (12).

2. Bobbin according to claim 1, characterised in that the connection sleeves (3 or 4 or 5) are slotted in the longitudinal direction (Figure 4).

3. Bobbin according to claim 1 or 2, characterised in that the outer surfaces of the connection sleeves (3 or 4 or 5) in their area which is inserted into the plastic clip (2) are provided with a grid embossment (33 or 34 or 35) (Figure 4).

4. Bobbin according to one of the claims 1 to 3, characterised in that the connection sleeves (3 or 4 or 5) in the area of their one lot of projecting sleeve ends are reduced to circular segment-shaped remaining sleeve wall parts (31 or 41 or 51).

5. Bobbin according to claim 4, characterised by such a mutual arrangement of several connection sleeves (3 or 4 or 5) inside a plastic clip (2) that the circular segment-shaped remaining sleeve wall parts (31 or 41 or 51 ) are arranged with the greatest possible mutual spacing in respect of each other in the plastic clip (2).

6. Bobbin according to one of the claims 1 to 5, characterised in that the bared ends (71 or 81 or 91) of the outer connection lines (7 or 8 or 9), which ends are inserted into the connection sleeves (3 or 4 or 5), as well as the winding ends (61 or 62 or 63) of the coil (6) wound about the free ends (31 or 41 of 51) of the connection sleeves (3 or 4 or 5) are soldered, by dipping the projecting sleeve ends (31 or 41 or 51 ) wrapped around by the winding ends (61 or 62 or 63) into a dip-solder bath (10), simultaneously with the connection sleeves (3 or 4 or 5).

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