Patent ID: 8672553

Claim:
A load detecting device for a roller bearing, comprising: a load detecting sensor that is provided in a roller arranged rollably between a first bearing ring and a second bearing ring, and that detects a load applied to the roller; a position detecting sensor that detects a rotation position of the roller in a revolution direction of the roller; and a recording device that is provided on the roller, and that records and stores a detection signal from the load detecting sensor; wherein the position detecting sensor includes a phototransmitter that transmits light toward a predetermined position on a revolution path of the roller, and a photoreceiver that is provided at the roller or a member revolving together with the roller and that receives light transmitted from the phototransmitter; and the recording device records a detection signal indicating light received by the photoreceiver, the detection signal indicating light being associated with the detection signal from the load detecting sensor.