Robert Boschgmbh

Peter Lack

Stefan Renner

Manfred Frister

Friedhelm Meyer

Gerhard Henneberger

Gunther Bergan

In an apparatus for noise reduction and damping in ventilators of electric machines, in particular vehicular alternators, it is proposed that the ventilator support on the rotor shaft be effected by axially staggering inner rubber inlays on both sides and providing adjoining outer spring pressure elements such that the ventilator region is clamped, at least in the axial direction and preferably radially as well with an additional rubber ring. As a result, the transfer of resonant vibrations of the rotor to the ventilator are reliably avoided, and the noise emissions are decisively reduced.

Noise damped dynamo electric machine, especially vehicular type

An electrical connection system for alternating current rectifiers, particularly for use in alternating-current bridge-type rectifiers for motor vehicle generators, in which a portion of an electrical conductor embedded in a circuit board is cooled to a lesser extent than the remainder of the electrical conductor. The lesser cooled portion may have a smaller cross-sectional area than do the remaining portions of the electrical conductor. In the case of an overload on the connection system, the lesser cooled and/or smaller cross-section portion melts through.

Electrical connection system for rectifiers

In a rectifier in which button diodes are mounted in pairs as columns on bases which also constitute heat sinks, the connector connecting the diodes to the AC phase is made of a material which has high thermal and electrical conductivity. The columns are fastened to the base-heat sink by use of additional heat sink members which in turn are fastened to the base by bolts or screws. The latter are electrically insulating. The base-heat sink is star-shaped, the diode columns being mounted on the rays of the star. Preferably, the additional heat sink members have extensions which increase their effective cooling area.

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Schwieberdingen, Germany

Peter Lack