Deutsche Carbone Ag

Le Carbone Lorraine

Conrad H Reynvaan

Arwed Uecker

Erhard Grohs

Klaus Groht

Lothar Biering

Eric Kammerer

Jurgen Spangenberg

Horst Siegmund

Emmanuel Joly

Klaus-Jurgen Muller

Wolfgang Dietz

Dieter Bruun

Jorgen Spangenberg

The invention relates to carbon brushes for electrical machines with commutator in a vehicle with a 36 volt electrical system. According to the invention, the specific electrical resistance of a carbon brush that can be used in a starter motor is greater than 1,000 &mgr;&OHgr;cm, the specific electrical resistance of a carbon brush that can be used in an auxiliary electric motor or an alternator is greater than 10,000 &mgr;&OHgr;cm, and the specific electrical resistance of a carbon brush that can be used in a fuel pump motor is greater than 20,000 &mgr;&OHgr;cm.

Carbon brush for an electrical machine in a vehicle

The process comprising the charging into a mould (3) of at least one electrically conductive powder (4), the compression by means of a piston (5) of the contents of the mould to form a crude brush (7), the heat treatment of said crude brush (7) as well as the fixing of the ends of the electrical conductors (2), characterised in that the charging involves at least the simultaneous introduction of at least two conductive powders (4B, 4A and/or 4C . . . ) for obtaining a brush formed by integral blocks (1B, 1A and/or 1C . . . ), the junction (1AB and/or 1BC . . . ) between said blocks being orientated at least in part in the compression direction (13).

Process for the production of multi-layered brushes and brushes obtained

A sliding contact member substantially free of the toxic metals lead and antimony, includes copper, carbon, and at least one added material which is selected from the group consisting of a metal and a metal alloy having a melting temperature which is substantially below that of copper. The sliding contact member contains less than 10 percent by weight of the at least one added material. The sliding contact member is electrically conductive and capable of carrying high current densities, and the at least one added material provides a good cleaning effect, promotes cooling of the sliding contact member during operation, and provides good slidability against a mating contact member. This is achieved by keeping the at least one added material separate from the copper so that alloy formation is inhibited and, preferably, prevented.

Sliding contact member for high currrent densities

An electroltytic process is described by which in order to increase the depletion factory, the material coefficient of the electrolyte passing through an electrolytic cell is increased along the direction of the electrolytic flow.

Electrolytic process

Growing community of inventors

Frankfurt am Main, Germany

Conrad H Reynvaan