The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 12, 1991
Filed:
Dec. 14, 1989
Youichi Matsumoto, Yokohama, JP;
Nippon Seiko Kabushiki Kaisha, Tokyo, JP;
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.