Method and apparatus for diagnosis of damage in bearing

Abstract

Abstract PURPOSE:To detect immediately the generation of metal-wipe and identify its progress with time by detecting metal-wipe waves and etc. with a sound detecting element and diagnosing the damage. CONSTITUTION:At a high pressure bearing 21 to prevent oil-whip, a sound detecting element 22 of piezoelectric ceramic element and etc. is installed to detect ultrasonic signals. Only when a shaft 20 is rotating with turning at low speed for a long time, the detecting outputs of this element 22 are taken into a turning judgment circuit 26, and processed in two kinds of comparative circuits 29a and 29b with different comparative voltage in a signal amplitude comparative circuit 28 and a division calculator 30 via a detecting circuit 27. Thus, instead of judgment based on temperature detection, generation of the first metal-wipe and the second metal-wipe can be detected immediately, and the state of their progression can also be known and shown at a bearing-damage indicator 31.

Inventors

• 👤 Takao Yoneyama
• 👤 Kazuya Sato
• 👤 Tomoaki Inoue

Bibliographic Details