BEARING DEVICE WITH IC TAG ATTACHED

摘要

A bearing assembly including an IC tag in which information can be reliably exchanged between the IC tag and an external reader/writer. The bearing assembly includes a rolling bearing (10) including an outer race (1), an inner race (2) and rolling elements (3) disposed between the outer race (1) and the inner race (2), and an IC tag (20) capable of communicating with an external reader/writer device without contacting the reader/writer device, and attached to a metal member (M) of the rolling bearing. The IC tag (20) includes a tag antenna (24) and is configured such that information can be exchanged between the tag antenna (24) and a reader/writer antenna of the reader/writer device by forming a closed magnetic circuit between the tag antenna (24) and the reader/writer antenna. The IC tag (20) is received in a hole (11) formed in the surface of the metal member (M). The tag antenna (24) includes at least two protrusions (22a and 22c) facing the opening of the hole (11). The protrusions (22a and 22c) are arranged such that magnetic fluxes leaving and/or entering the protrusions (22a and 22c) pass inside of the edge defining the opening of the hole (11) and extend to outside of the hole (11), so that information can be exchanged between the IC tag (20) and the reader/writer device.