Patent ID: 8065916

Claim:
A bearing state diagnostic apparatus comprising: a cylindrical support body, at least one bearing supported in the support body, at least one sound sensor for detecting a sound generated by the at least one bearing and for generating a signal based on the detected sound, wherein the at least one sound sensor is disposed at a position separated away from the outer surface of the support body and away from a vicinity of the at least one bearing, a detection sound propagation path providing communication between the at least one bearing and the at least one sound sensor, wherein the detection sound propagation path comprises a through hole formed in the cylindrical support body and a pipe connected to the through hole, through which sound generated by the bearing is propagated for detection by the at least one sound sensor, state diagnostic apparatus for comparing the signal from the sound sensor with data representing normal operation of the at least one bearing and diagnosing the state of the at least one bearing based on the comparison.