Patent ID: 8167499

Claim:
A rolling bearing device with a sensor comprising: a first raceway member including an inner peripheral surface having a raceway surface; a second raceway member including an outer peripheral surface having a raceway surface; an annular displacement-detected portion provided separately from the second raceway member and disposed on the outer periphery surface of the second raceway member; rolling elements arranged between the raceway surfaces of the first and second raceway members; and a sensor unit that detects radial displacement and axial displacement of the displacement-detected portion, 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; a rotation signal detector that detects a signal associated with rotation of the annular portion relative to at least one of the first displacement detector and the second displacement detector, based on an output of at least one of the first displacement detector and the second displacement detector; and a displacement signal detector that detects a signal associated with the displacement of the displacement-detected portion based on an, output of the first displacement detector, and detects a signal associated with the displacement of the displacement-detected portion based on an output of the second displacement detector, wherein the displacement-detected portion includes an annular portion which includes a plurality of grooves that are arranged at intervals from each other in a circumferential direction of the displacement-detected portion and extend axially, wherein the displacement-detected portion includes a first cylindrical surface portion connected to the annular portion via a stepped portion, and a second cylindrical surface portion connected to the annular portion to the first cylindrical surface portion via a stepped portion, and located on substantially the same cylindrical surface as the first cylindrical surface portion, wherein each of the grooves axially extends from one axial end of the annular portion to an other axial end of the annular portion, wherein the first displacement detector and the second displacement detector substantially axially overlap each other, wherein the detection surface of the first displacement detector radially overlaps an end of the first cylindrical surface portion on the side of the annular portion, and radially overlaps an end of the annular portion on the side of the first cylindrical surface portion, and wherein the detection surface of the second displacement detector radially overlaps an end of the second cylindrical surface the side of annular portion, and radially overlaps an end of the annular portion on the side the second cylindrical surface portion.