DE3504298A1 - FOR A HIGH VOLTAGE WINDING, ESPECIALLY FOR THE SECOND DEVELOPMENT OF A MOTOR VEHICLE IGNITION COIL OF SPECIFIC COIL BODIES - Google Patents

Description

January 31, 1985 Li / wi

ROBERT BOSCH GMBH, 7OOO Stuttgart 1

For a high voltage winding, especially for the
Secondary winding of a motor vehicle ignition coil of certain bobbins

State of the art

The invention is based on a coil body according to the preamble of the claim.

A coil body lying in this direction is already known (according to DE-GM 83 17 ^ 7-8), in which, however, the winding groups pass through the cutouts
touch or approach at a very small distance and thus electrical flashovers cannot be ruled out. The winding wire can also take an undesirable course there when it passes through the cutout, in that
it bends, for example, against other turns.
Finally, the known bobbin is related to
the rotation guide when passing through the cutout
not solved optimally.

R. 19ÖU9 Advantages of the invention

By applying the measures mentioned in the characterizing part of the claim, the aforementioned disadvantages are eliminated avoided to a satisfactory extent.

drawing

An embodiment of the invention is shown in the drawing ~ - voltage shown and explained in detail in the following description. 1 shows a bobbin according to the invention in a side view, and FIG. 2 and FIG. 3 show the detail with the winding wire passing through it in an enlarged view.

Description of the embodiment

The illustrated coil body is intended to accommodate a high-voltage winding 1, in particular the secondary winding of an ignition coil belonging to a motor vehicle. The bobbin is made of insulating material, specifically in the preferred case of polycarbonate with twenty percent by weight glass fiber as filler. In the dismantled state, it has the shape of a hollow body with two open end faces 2, 3. On the outer circumference, winding chambers h extending in the form of grooves in the circumferential direction are provided, which are laterally delimited by partition walls 5. The winding 1 is divided into winding groups 6, which are connected electrically in series and are each housed in one of the winding chambers k. For the passage of the winding wire 7 from one winding chamber k to the other winding chamber k there is a notch-like cutout 8 in FIG

-X- R. 19ÖU9

of the intermediate partition 5 s whose depth t is less than the partition height h. For reasons of stability, the cutouts 8 of two adjacent partition walls 5 are offset by 180 in the circumferential direction of the coil body. The course of the winding wire 7 in the cutout 3 begins in the area of the upper edge of the partition wall 9 and ends in the foot region 10 of the partition wall. The winding wire 7 is supported by a support surface 11 which gradually decreases in height a so that an inclined plane between the upper edge of the partition wall 9 and the foot region 10 results. The support surface 11 in the foot region 10 of the partition h results from the fact that the wall thickness b of the upwardly tapering partition k is reduced towards the cutout 8 and this reduction 12 takes place from the side facing the winding wire 7 passing through. Similarly, the bearing surface 11 is formed in the region of the partition upper edge 9, characterized in that the wall thickness b decreases the partition wall 5 after the cutout 8 through ■ ', and if this reduction 13 of the -tenden the durchtre- _Λ winding wire 7 facing side.

By applying these measures, a favorable course of the winding wire 7 is obtained in the area of the cutout 8 and reliably prevents adjacent winding groups k from coming into contact with one another or with the winding wire 7 passing through the cutout 8 and causing electrical flashovers as a function of this.

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Claims (1)

R. 1981 + 9 31.1. 1985 Li / Wl ROBERT BOSCH GMBH, 7OOO Stuttgart 1 claim For a high-voltage winding, in particular for the secondary winding of a motor vehicle ignition coil, the coil body is made of insulating material and, in the dismantled state, is a hollow body with two open end faces and which also has winding chambers running in the circumferential direction in the form of grooves on the outside, which are laterally bounded by partition walls winding chambers one each comprised of a plurality of winding groups, which are electrically connected in series, and further is for the passage of the winding wire of a Wioklungskammer § to the other winding chamber, a cutout in the intervening ¹ J underlying partition, the depth of which is smaller than the partition wall height, In addition, the wire course leads through the cutout with an approximate continuation of the winding direction from the area of the upper edge of the partition wall into the foot area of the partition wall and the wire is supported by a support surface which gradually decreases in height, and wherein Finally, the support surface in the foot area of the partition is obtained in that the wall thickness of the partition is reduced towards the cutout and this reduction takes place from the side facing the passing winding wire, characterized in that the support surface (11) is also in the area of the partition upper edge (9) results in that the wall thickness (b) of the partition (5) is reduced towards the cutout (8) _ ο _ R- 198U9 and this reduction (13) takes place from the side facing the passing winding wire (7).