State determination device for hub unit bearing, state determination method for hub unit bearing, program, and hub unit bearing

A state determination device for a hub unit bearing comprising:

• an acquisition unit configured to acquire measurement information, of the magnetic characteristics in the vicinity of a flange portion of the hub unit bearing during a predetermined rotation operation, by communicating with a magnetic sensor that is of the hub unit bearing and is configured to detect the magnetic characteristics;
• a derivation unit configured to derive a difference between a maximum value and a minimum value in the measurement information acquired by the acquisition unit;
• and
• a determination unit configured to determine a state of the hub unit bearing based on the difference derived by the derivation unit,
• wherein a predetermined position is the position at which the magnetic characteristics vary with the stress change with respect to the flange portion.

A state determination method for a hub unit bearing comprising:

• acquiring measurement information, of magnetic characteristics at a predetermined position in the vicinity of a flange portion included in the hub unit bearing, by communicating with a magnetic sensor that is of the hub unit bearing and is configured to detect the magnetic characteristics;
• deriving a change amount between reference information of the magnetic characteristic at the predetermined position in the vicinity of the flange portion and the measurement information acquired in the acquiring;
• and
• determining the state of the hub unit bearing based on the difference derived in the deriving,
• wherein the predetermined position is the position at which the magnetic characteristics vary with the stress change with respect to the flange portion,
• the magnetic characteristics comprise a magnetic flux density, and
• the reference information and the measurement information include information in three axial directions of the magnetic flux density.

A state determination method for a hub unit bearing comprising:

• acquiring measurement information, of magnetic characteristics in the vicinity of a flange portion of the hub unit bearing, by communicating with a magnetic sensor that is of the hub unit bearing and is configured to detect the magnetic characteristics during a predetermined rotation operation;
• deriving a difference between a maximum value and a minimum value in the measurement information acquired in the acquiring;
• and
• determining the state of the hub unit bearing based on the difference derived in the deriving,
• wherein a predetermined position is a position at which the magnetic characteristics vary with the stress change with respect to the flange portion.

A non-transitory computer-readable medium storing a program which causes a computer to function as:

• a holding unit configured to hold reference information, of magnetic characteristics at a predetermined position in the vicinity of a flange portion included in the hub unit bearing, by communicating with a magnetic sensor that is of the hub unit bearing and is configured to detect the magnetic characteristics;
• an acquisition unit configured to acquire measurement information of the magnetic characteristics at the predetermined position of the hub unit bearing;
• a derivation unit configured to derive a change amount between the reference information held by the holding unit and the measurement information acquired by the acquisition unit;
• and
• a determination unit configured to determine a state of the hub unit bearing based on the change amount derived by the derivation unit,
• wherein the predetermined position is the position at which the magnetic characteristics vary with the stress change with respect to the flange portion,
• the magnetic characteristics comprise a magnetic flux density, and
• the reference information and the measurement information include information in three axial directions of the magnetic flux density.

A non-transitory computer-readable medium storing a program which causes a computer to function as:

• an acquisition unit configured to acquire measurement information, of magnetic characteristics in the vicinity of a flange portion of a hub unit bearing during a predetermined rotation operation, by communicating with a magnetic sensor that is of the hub unit bearing and is configured to detect the magnetic characteristics;
• a derivation unit configured to derive a difference between a maximum value and a minimum value in the measurement information acquired by the acquisition unit;
• and
• a determination unit configured to determine a state of the hub unit bearing based on the difference derived by the derivation unit,
• wherein a predetermined position is the position at which the magnetic characteristics vary with the stress change with respect to the flange portion.

A hub unit bearing comprising:

• an outer ring having an outer ring raceway on an inner peripheral surface thereof;
• a hub having an inner ring raceway on an outer peripheral surface thereof, the inner ring raceway facing the outer ring raceway of the outer ring;
• and a plurality of rolling elements rollably provided between the outer ring raceway and the inner ring raceway, the hub unit bearing further comprising:
• a magnetic sensor configured to detect magnetic characteristics in the vicinity of a flange portion provided in the hub unit bearing,
• wherein a detection position detected by the magnetic sensor is a position at which the magnetic characteristics vary with the stress change with respect to the flange portion,
• the magnetic characteristics comprise a magnetic flux density, and
• the reference information and the measurement information include information in three axial directions of the magnetic flux density.