Patent ID: 8167497

Claim:
A sensor-equipped bearing for a wheel rotatably supporting the wheel relative to a vehicle body comprising: an outer member provided with a double-row raceway surface on an inner periphery thereof; an inner member provided with raceway surfaces opposing to the raceway surfaces of the outer member, one of the outer and inner members serving as a stationary member; double-row rolling elements interposed between the outer and inner raceway surfaces; and a sensor unit provided on the stationary member, and having a sensor fitting member fixed to a peripheral surface of the stationary member, and a plurality of strain sensors attached to the sensor fitting member for measuring a strain thereof, the sensor fitting member having at least two contact fixing portions fixed to the stationary member and at least one cut-off portion between the neighboring contact fixing portions, the strain sensor being attached to the cut-off portion, the sensor fitting member being formed as an approximately circular arc shape of the stationary member, the sensor fitting member being formed with the contact fixing portions protruding radially from the circular arc, wherein there exists a gap between the positions other than the contact fixing portions of the sensor fitting member and the inner peripheral surface of the stationary member, and wherein the cut-off portion has a lower rigidity than other portions of the sensor fitting member, so that a strain greater than the strain of the stationary member is generated in the sensor fitting member.