US 11,867,227 B2
Bearing monitoring apparatus and method for monitoring bearing
Hideo Fujiura, Nagano (JP); Yukinori Hirai, Tokyo (JP); and Shintaro Takata, Nagano (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Appl. No. 17/596,755
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
PCT Filed Jun. 11, 2020, PCT No. PCT/JP2020/023073
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2020/255860, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 2019-115681 (JP), filed on Jun. 21, 2019.
Prior Publication US 2022/0243771 A1, Aug. 4, 2022
Int. Cl. F16C 19/52 (2006.01); F16C 33/58 (2006.01); G01L 5/00 (2006.01); G01M 13/04 (2019.01); F16C 19/06 (2006.01); F16C 35/073 (2006.01); F16C 35/077 (2006.01); G01M 13/045 (2019.01)
CPC F16C 19/06 (2013.01) [F16C 19/522 (2013.01); F16C 33/586 (2013.01); F16C 35/073 (2013.01); F16C 35/077 (2013.01); G01L 5/0019 (2013.01); G01M 13/045 (2013.01); F16C 2233/00 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A bearing monitoring apparatus comprising:
a rolling bearing including
an outer ring,
an inner ring disposed coaxially with the outer ring, the inner ring being on an inner peripheral side of the outer ring,
multiple rolling elements disposed between the outer ring and the inner ring, and
a strain gauge configured to detect strain of the outer ring or the inner ring, the strain gauge including at least two resistors, and the resistors being arranged in a same direction as an arrangement direction of the rolling elements so as to correspond to spacing between rolling elements that are next to each other;
a first circuit configured to generate a first distorted waveform based on an output of one resistor of the at least two resistors and to generate a second distorted waveform based on an output of another resistor of the at least two resistors; and
a second circuit configured to:
subtract the second distorted waveform from the first distorted waveform to generate a differential waveform; and
compare the differential waveform against a reference value to detect a wear state of the rolling bearing.