Abstract: Epoxy resin casting compositions comprising(a) a liquid aromatic glycidyl or .beta.-methylglycidyl ether or a liquid mixture of several aromatic glycidyl or .beta.-methylglycidyl ethers containing on average more than one glycidyl ether group per molecule,(b) one or more than one acid hardener for the glycidyl ether,(c) a curing accelerator,(d) a filler mixture containing calcite and wollastonite in an amount from 40 to 60% by weight, based on components (a), (b) and (d), and as optional components,(e) customary additives for epoxy resin casting compositions are suitable in particular for coating or encapsulating electrical or electronic components and, more particularly, electrical ignition coils.

Abstract: The use of a thermosetting epoxy resin blend as a casting compound for electronic or electrotechnical components. The blend contains a silicone-modified epoxy resin in which organic components containing epoxy groups are chemically bonded to silicone components, and a mineral filler, optionally silanized, that regulates the thermal expansion behavior, in an amount of 40 wt % to 75 wt %, based on the thermosetting epoxy resin blend. The thermosetting epoxy resin blends are used to particular advantage for casting diodes.

Abstract: Epoxy resin casting compositions comprising(a) a liquid aromatic glycidyl or .beta.-methylglycidyl ether or a liquid mixture of several aromatic glycidyl or .beta.-methylglycidyl ethers containing on average more than one glycidyl ether group per molecule,(b) one or more than one acid hardener for the glycidyl ether,(c) a curing accelerator,(d) a filler mixture containing calcite and wollastonite in an amount from 40 to 60% by weight, based on components (a), (b) and (d), and as optional components,(e) customary additives for epoxy resin casting compositions are suitable in particular for coating or encapsulating electrical or electronic components and, more particularly, electrical ignition coils.

Abstract: A pole core with pole lips serves for fixing a field winding in the pole housing of a direct current motor. The pole core has a central pole body mountable on an inner side of the pole housing. The pole lips are formed of one piece with the central pole body and are resiliently and springily connected to the central pole body, so that the field coil can be pressed against the pole housing in an elastic springy manner without additional spring elements, so that no damage occurs to the insulating coat of the coil.

Abstract: An RPM sensor for anti-lock and/or traction control systems of motor vehicles or for engine speed governing or gasoline or Diesel injection control. The RPM sensor has a housing, receiving electrical components, with a first housing part of plastic that is at least partly enveloped by a second housing part, produced in an injection molding process, likewise from plastic. To attain a moisture-proof, material bond between the two housing parts, a melting element of a plastic having a lower melting point than that of the plastic of the housing parts is disposed in a contact zone between the two housing parts. When the second housing part is formed, the melting element is heated above its melting point, and a material bond of the two housing parts is attained which protects the RPM sensor against moisture dirt, stress, etc.

Abstract: An encapsulating resin composition for electrical and electronic components consists of cycloaliphatic epoxy resin, a hardener, an accelerator, a filler and, sometimes, a pigment. As a result of the combination of the cycloaliphatic epoxy resin with the provision of methylnadic anhydride as hardener and amporhous SiO.sub.2 as a filler, the material is capable of flowing at room temperature, is physiologically harmless and also otherwise well suited for mass production of a wide variety of electrical and electronic components, for example diodes and other semi-conductors for the motor vehicle industry. A small addition of hollow glass spherical particles counteracts sedimentation of amorphous SiO.sub.2 in pre-hardening storage of the resin.

Abstract: To reliably prevent ingress of moisture to a connection between an electrical connecting cable or line to an electrical apparatus within a housing, the conductors of the cable or line are externally surrounded by an insulating layer which is of such a material that it joins, by melting or chemical reaction with the material of a surrounding bushing or sleeve, which bushing or sleeve then can be secured in a wall of the apparatus, for example by a removable rubber ring (FIG. 2) or can be molded into the housing of an electrical apparatus, for example a sensor; preferably, the materials of the housing and of the plug or sleeve also join, either by melting together or by chemical reaction. For a melt connection, a thermoplastic such as polyamide is suitable; for reactive connection, a reactive thermosetting plastic, for example polyester imide, or epoxy may be used.

Abstract: A meander-shaped layer of nickel is deposited by evaporation on a ceramic wafer over an intermediate layer of tantalum serving to improve adhesion, and covered by a protective coating of silicon or epoxy resin is used as a temperature sensor in the intake pipe of a supercharged internal combustion engine. The low mass of the sensor element thus provided enables the resistance of the nickel path to follow rapidly, by its variation, the variations of temperature of the intake air. The sensor has a casing made up of two parts, the lower one of which has two connection prongs molded into it, the ends of which are flattened into tabs that are soldered to contact areas of the ceramic wafer. The upper casing portion has a cavity for the ceramic wafer, the lower part of which is filled with a potting compound to protect the solder joints. The width of the nickel paths that provide the temperature sensitive resistance is about 50 .mu.m and the thickness is from 0.2 to 1 .mu.