DE1438713A1 - Ignition armature or ignition coil for ignition devices of internal combustion engines - Google Patents

Description

Ba / Lm R. no. 7720
December 7, 1961

Attachment to

Patent and

1 ftQ.

ROBERT B03CH GMBH. Stuttgart W, Breitsoheidstrasse 4 Ignition armature or ignition coil for ignition devices of combustion

• prime movers

The invention relates to ignition armatures or ignition coils for ignition devices of internal combustion engines, the windings of which are wound on a biscuit core, soaked in a drinking liquid and with a Protective sheath are surrounded. .

Various methods have recently become known which the use of thermosetting and thermoplastic plastics provide for the insulation of ignition armatures and ignition coils.

A * simplest wire it of course, when to impregnate the windings and one and the same for the production of a protective jacket

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Lifted; Bcaoh GmbH Ba-'Lm R ₀ -Wr. 7 '/ 2O Stuttgart December 7 :: 96i

Thermoset plastic could be used. This is; in itself possible, but not for economic reasons recommend, in particular, the hardening of the protective ring a long dwell in the Giesaform and the process very delayed and expensive.

For this reason, the windings are known to be used with Zundanker impregnated with a thermosetting plastic, but the coating is made of a thermoplastic material. It must It must be accepted that thermoplastics have a low heat resistance and therefore not in many cases can be considered. -

These disadvantages are avoided in the case of a Zundanker whose windings are impregnated with a thermoset plastic according to the invention and a molding compound is used for the sheathing, which also consists of a thermosetting plastic with an additive of filler. The fillers used can be powdery and / or fibrous and the molding compound can contain 20 to 80 % powdery and / or 5 to 55 % fibrous fillers, depending on the properties required.

In the drawing, as an exemplary embodiment of the subject matter of the invention, an ignition armature of a magneto flywheel is in section shown, the windings impregnated with a polyester resin and provided with elnijf ^ ltatntel made of a Polyeeterharapressmasse are.

In the drawing, the bite core of the ignition armature is marked with 10 * Br is layered from thin sheet metal and has salient poles 11. On the anchor bar are first layers of insulation 12 and then * a primary winding 13 and a secondary winding 14 wound up.

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Robert Bosch OmbH Ba / Lm R, -Nr. 7720

Stuttgart December 7, 1961

Both windings are impregnated with a polyester resin 15. A protective jacket 16 made of a polyester resin molding compound, which contains 55% polyester resin, 60 % calcium carbonate and 5 % glass fibers, is applied after the impregnation and also fills the gaps between the windings and the armature poles 11 over the impregnated windings. Such a molding compound cured at 140 to 16O ⁰ C in from 1 to 2 minutes. The production process is thus stopped by them in any catfish, it can be briefly heated to 250 ⁰ C.

Instead of a polyester resin, an epoxy resin can also be used to impregnate the windings and to produce the molding compound will. The fillers can also be used depending on the required properties can be varied in terms of their proportion and their nature. Instead of calcium carbonate can e.g. also include quartz, kaolin, Qliomer, talc, barite, etc. are used, while glass fibers are replaced by asbestos, cotton, Sisal and synthetic fibers can be replaced.

Under certain circumstances it can be useful, as can the molding compound $ 1 zinc stearate. to add "by which the solution of the order", Anchor is relieved from the mold. .

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BAD ORiGiNAL 909839/0340

Claims (1)

H38713 Robert Bosch OrabH Ba / Lm R * .- No. 7720 Stuttgart December 7, 1966 I. Expectations 1. Zundanker or ignition coil for ignition units of internal combustion engines «whose windings on one. The iron core is wound up, “coated with an impregnating material and covered with a protective jacket , which is ■■ marked” that a hardening casting resin is used to impregnate the winding and a pressing ·. Mass used 1st, which is also made of a hardening casting resin with the addition of fillers. 2. Zundanker according to claim 1, characterized in that «the Puree mass contains powdery and / or fibrous fillers. ?. Zundanlcer according to claim 1 and 2, characterized in that the press size * contains 5 to 35 % fibrous and 20-80% powdery fillers. 909839/0340 H38713 Robert Bosch GmbH Ba / Lm R. no. 7720 Stuttgart December 7, 1961 4. Ignition armature naoh claim 3. - Jt, characterized »that its ~ windings impregnated with a polyester resin and with a Polyester molding compound is coated, 'the 60 $ calcium carbonate ,. Contains 5 # fiberglass and 35 % polyester resin. • ■ ■ * ■, · ·> ■. . τ ■ - ■■■■ '.' , ν · ■ ■ / - - ■; .. ■ "■■ - · ■ ■■.> ■. - ■■: ■■■ ..-- ^ ν; -: ··· ";.-''- · 909839/0340 - = .. original in" Blank page