Rolling bearing unit having tone wheel

摘要

A rolling bearing unit having a tone wheel (14a) and a seal device which has an elastic seal member (12a) and a core metal (13a) to reinforce the elastic seal member to seal the space where the rolling members (9) are provided, the tone wheel (14a) comprising an annular multipole magnet with South and North poles alternately arranged in a circumferential direction and supported by the generally annular seal ring.