Method and apparatus for detecting cracks in bearings
US4991442A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1989 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Dec 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2696
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and an apparatus for detecting a crack in a bearing including a stationary element, a moving element, and a plurality of rolling elements disposed between the stationary element and the moving element. A crack sensor detects a signal characteristic of a crack in the bearing. A rolling element position sensor detects a position of the rolling elements. A moving element position sensor detects a position of the moving element. When an output signal from the crack sensor is supplied for the first time, based on at least one of position signals respectively supplied from the rolling element position sensor and the moving element position sensor, there is determined a condition of the at least one of position signals to be satisfied when the output signal from the crack sensor is supplied the next time. The at least one of position signals is monitored thereafter to accumulate the output signal from the crack sensor if the output signal is supplied when the at least one of position signals satisfying the condition is supplied, to thereby determine whether or not the crack exists in the bearing based on a result of the accumulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.