Patent ID: 7538545

Claim:
A combined sensor and bearing assembly, the assembly comprising: a rolling bearing unit made up of a rotatable raceway member, a stationary raceway member and at least one row of rolling elements rollingly interposed between the rotatable and stationary raceway members; and a rotation sensor unit including a to-be-detected member made up of a magnet fitted to one of the raceway members; and a magnetic detecting member fitted to the other raceway member at a location confronting the to-be-detected member, wherein the combined sensor and bearing assembly is used at a location close to an electric coil emanating a leakage magnetic field in a condition in which a direction of flow of an electric current through the coil is fixed in one direction; and the magnet of the to-be-detected member is made up of a first magnet of which an S-pole is to be detected, and a second magnet of which an N-pole is to be detected and spaced from the first magnet in a direction circumferentially of the rotatable and stationary raceway members.