Patent ID: 9267864
Filing Date: 2016-02-23
CPC Classification: G01M

Claim Text:
1. A method for identifying possible damage in a toothed transmission stage having at least one pair of meshing toothed wheels, comprising the steps of: measuring with at least one vibration transducer at least one first oscillation signal corresponding to oscillations produced by a rolling and impact motion when teeth of a first of the at least one pair of the toothed wheels mesh under load during operation of the transmission stage, determining from the at least one first oscillation signal a tooth engagement duration of the at least one pair of meshing toothed wheels, determining a difference between a pattern of the tooth engagement duration in operation of the transmission stage and the tooth engagement duration under a known load and at a known speed, comparing the at least one first oscillation signal with a first calibration oscillation signal, the difference between a pattern of the tooth engagement duration in operation of the transmission stage and the tooth engagement duration under a known load and at a known speed, and evaluating the at least one measured first oscillation signal and the determined torque to identify the possible damage to the transmission stage.