Patent ID: 8397590

Claim:
A sensor equipped wheel support bearing assembly for rotatably supporting a vehicle wheel relative to a vehicle body structure, which comprises: an outer member having an inner periphery formed with a plurality of rolling surfaces; an inner member having an outer periphery formed with rolling surfaces opposed to the rolling surfaces of the outer member; a plurality of rows of rolling elements interposed between the respective opposed rolling surfaces defined in the outer member and the inner member; a load detecting device provided in one of the outer and inner members that serves as a stationary member for detecting a load imposed on the wheel support bearing assembly; a rotation detecting device for detecting a rotation of the other of the outer and inner members that serves as a rotating member; an averaging circuit for calculating a rotational speed of the rotating member from an output signal of the rotation detecting device, determining from the calculated rotational speed, a time period required for the rolling elements to revolve a pitch of arrangement of the rolling elements to thereby calculate an average value of an output signal of the load detecting device during the time period; and an estimating circuit for estimating from the calculated average value of the averaging circuit, a load acting on a tire tread surface or a load acting on the wheel support bearing assembly.