Rolling bearing, and rolling bearing diagnostic device

A diagnostic device that diagnoses a rolling bearing which comprises:

• an inner ring;
• an outer ring arranged concentrically with the inner ring;
• and
• a plurality of rolling elements arranged between a raceway surface of the outer ring and a raceway surface of the inner ring, and each rolling in association with rotation of the inner ring, rotation of the outer ring, or rotation of both the inner ring and the outer ring,
• the diagnostic device comprising:
• a behavior sensor that is provided on a housing that holds the inner ring or the outer ring and measures behavior of the housing;
• and
• processing circuitry
• to calculate an evaluation speed based on information acquired by the behavior sensor, the evaluation speed being a total value of a maximum speed component in a direction of a load acting from a rotation shaft, which rotates in an integrated manner with the inner ring or the outer ring, and a maximum speed component in a direction opposite to the direction of the load acting from the rotation shaft, within a period equal to or longer than a cycle of characteristic vibration determined by specifications of the rolling bearing and a rotation speed of the rotation shaft, and
• to diagnose damage to the rolling bearing by using an evaluation index based on the evaluation speed.

A diagnostic device that diagnoses a rolling bearing which comprises:

• an inner ring;
• an outer ring arranged concentrically with the inner ring;
• and
• a plurality of rolling elements arranged between a raceway surface of the outer ring and a raceway surface of the inner ring, and each rolling in association with rotation of the inner ring, rotation of the outer ring, or rotation of both the inner ring and the outer ring,
• the diagnostic device comprising:
• a behavior sensor that is provided on a housing that holds the inner ring or the outer ring and measures behavior of the housing;
• and
• processing circuitry
• to calculate an evaluation speed based on information acquired by the behavior sensor within a period equal to or longer than a cycle of characteristic vibration determined by specifications of the rolling bearing and a rotation speed of the rotation shaft, which rotates in an integrated manner with the inner ring or the outer ring, the evaluation speed being a total value of a maximum speed component of a vibration in a direction of a load acting from the rotation shaft and a maximum speed component of the vibration in a direction opposite to the direction of the load acting from the rotation shaft, and
• to diagnose damage to the rolling bearing by using an evaluation index based on the evaluation speed.