Schaeffler Technologies Ag & Co .kg

Hans-Willi Kessler

Joachim Hering

Martin Kram

Klaus Vaehsen

A detector arrangement, for selective detection of vibrations on a component, comprises a film fitted with at least one piezoelectric element. The film is attached to the component in such a way that occurring mechanical vibrations act on the piezoelectric element, such that an electrical charge with a frequency correlating with the mechanical vibration is generated at the connection electrodes of the piezoelectric element. An electrical filter is connected to the piezoelectric element and filters out the component of the supplied charge which corresponds to a predefined frequency. An electrical charge storage means which is connected to the filter is used to accumulate the filtered-out charge components. A signaling means is also provided, which generates an electrical signal as soon as a predetermined charge limit value is reached on the charge storage means.

Piezoelectric film having electrical filter for selectively detecting vibrations in components

An apparatus for monitoring a machine element (), which moves with respect to a base and rotates about its own axis, having a sensor () and evaluation electronics (). According to the invention, the sensor () and the evaluation electronics () and also a power supply unit and a transmitter unit () are arranged on the moving machine element ().

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Langerwehe, Germany

Hans-Willi Kessler