Patent ID: 7702472

Claim:
A rolling bearing device with a sensor comprising: a first raceway member including a peripheral surface having a raceway surface; a second raceway member including a peripheral surface having a raceway surface and an annular displacement-detected portion; rolling elements arranged between the raceway surfaces of the first and second raceway members; a sensor unit that detects radial displacement and axial displacement of the displacement-detected portion; and a calculator, wherein the sensor unit includes: a first displacement detector including a detection surface that radially faces the displacement-detected portion; a second displacement detector located at a distance axially from the first displacement detector, and including a detection surface that radially faces the displacement-detected portion, wherein the first displacement detector and the second displacement detector substantially axially overlap each other, and each of the first displacement detector and the second displacement detector includes four displacement sensors arranged at substantially regular intervals in a circumferential direction, wherein the calculator calculates translational loads that act on the displacement-detected portion, and moment loads that act on the displacement-detected portion on the basis of fi−ri, ti−bi, fo−ro, to−ro, and a value that is obtained by subtracting from an output of one sensor of the first displacement detector an output of one sensor of the second displacement detector that substantially overlaps the one sensor axially, or a value that is obtained by subtracting from the sum of outputs of a plurality of sensors of the first displacement detector the sum of outputs of a plurality of sensors of the second displacement detector that substantially overlap the plurality of sensors axially, where outputs of the four sensors of the first displacement detector are represented by fi, ri, ti, and bi, respectively, and outputs of the four sensors of the second displacement detector are represented by fo, ro, to, and bo, respectively, and where fi and ri are outputs of two sensors of the first displacement detector located substantially line-symmetrically with respect to a central axis of the second raceway member, ti and bi are outputs of the other two sensors of the first displacement detector located substantially line-symmetrically with respect to the central axis of the second raceway member, fo is an output of a sensor that substantially overlaps the sensor outputting fi axially, ro is an output of a sensor that substantially overlaps the sensor outputting ri axially, to is an output of a sensor that substantially overlaps the sensor outputting ti axially, and bo is an output of a sensor that substantially overlaps the sensor outputting bi axially.