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US 4,376,389 AGranted
Method of diagnosis of operating conditions of bearing and apparatus therefor
AssigneeHitachi, Ltd.
InventorsTomoaki Inoue, Kinpei Okano, Kazuo Ikeuchi, Tsuguaki Koga
Life of this patent
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Abstract
A method of and an apparatus for diagnosis of the operating conditions of a bearing wherein pressures of a film of oil formed on a sliding surface of the bearing journalling a rotary shaft are detected at a plurality of points on the sliding surface, and the pressure differential between the pressures of the oil film detected at the plurality of points is calculated. The deflection of the bearing with respect to the rotary shaft is calculated based on the calculated oil pressure film pressure differential, so that the operating conditions of the bearing are judged based on the deflection thereof.
Claims21
A method of diagnosis comprising the steps of:
- detecting values representing the conditions of the bearing indicative of the behavior of the bearing journalling a rotary shaft, including detecting pressures of an oil film formed by lubricant on a sliding surface of the bearing at a plurality of points on the sliding surface as values representing one condition of the bearing;
- diagnosing at least one of the operating conditions of the bearing and abnormality in the bearing based on the detected values of the conditions of the bearing including calculating the pressure differentials between the plurality of values of oil film pressures detected at the plurality of points;
- and calculating the deflection of the bearing with respect to the rotary shaft based on the calculated oil film pressure differentials, to thereby diagnose the operating conditions of the bearing.
A method of diagnosis of a bearing, comprising the steps of:
- detecting values representing the conditions of the bearing indicative of the behavior of the bearing journalling a rotary shaft including detecting the bearing surface layer temperatures in the vicinity of the sliding surface of the bearing and the temperature of the lubricant fed to the sliding surface of the bearing as values representing one condition of the bearing;
- diagnosing at least one of the operating conditions of the bearing and abnormality in the bearing based on the detected values of the conditions of the bearing including calculating the temperature differentials between the detected bearing surface layer temperatures and the detected temperature of the lubricant fed to the sliding surface of the bearing;
- and diagnosing the operating conditions of the bearing based on the calculated temperature differentials.
A method of diagnosis of a bearing, comprising the steps of:
- detecting values representing the conditions of the bearing indicative of the behavior of the bearing journalling a rotary shaft including detecting sound signal values from the bearing as values representing one condition of the bearing;
- diagnosing at least one of the operating conditions of the bearing and abnormality in the bearing based on the detected values of the conditions of the bearing including diagnosing the operating conditions of the bearing based on the detected sound signal values.
An apparatus for diagnosis of a bearing comprising:
- means for detecting values representing the conditions of the bearing indicative of the behavior of the bearing journalling a rotary shaft, said means for detecting values representing the conditions of the bearing including pressure detecting means for detecting the pressures of an oil film formed by lubricant on a sliding surface of the bearing;
- arithmetic means for diagnosing the operating conditions of the bearing based on the values representing the conditions of the bearing detected by said detecting means, said arithmetic means including a first calculating unit for calculating the oil film pressure differentials between oil film pressure signals produced by said pressure detecting means at a plurality of points on said sliding surface of the bearing, a second calculating unit for calculating the deflection of the bearing with respect to the rotary shaft based on the oil film pressure differentials calculated by said first calculating unit, and a first judging unit for diagnosing the operating conditions of the bearing based on the deflection of the bearing calculated by said second calculating unit.
An apparatus for diagnosis of a bearing comprising:
- means for detecting values representing the conditions of the bearing journalling a rotary shaft, said means for detecting values representing the conditions of the bearing including bearing surface layer temperature detecting means located in the vicinity of the sliding surface of the bearing for detecting the temperature of the bearing surface layer, and fed oil temperature detecting means for detecting the temperature of lubricant fed to the sliding surface of the bearing;
- arithmetic means for diagnosing the operating conditions of the bearing based on the values representing the conditions of the bearing detected by said detecting means, said arithmetic means including a first calculating unit calculating the temperature differential between the detected temperature of the bearing surface layer and the detected temperature of the lubricant fed to the sliding surface of the bearing, and a first judging unit for judging abnormality in the bearing based on the comparison of the calculated temperature differential with a reference value of temperature set beforehand.
An apparatus for diagnosis of a bearing comprising:
- means for detecting values representing the conditions of the bearing indicative of the behavior of the bearing journalling a rotary shaft, said means for detecting values representing the conditions of the bearing including sound detecting means mounted on the bearing;
- arithmetic means for diagnosing the operating conditions of the bearing based on the values representing the conditions of the bearing detected by said detecting means, said arithmetic means comprises a judging unit for judging abnormality in the bearing based on the comparison of the sound signal generated by said sound signal with a reference value of sound set beforehand.
Dependencies are inferred from the claim text.