Importance

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Abstract

A bearing assembly includes a bearing including a rotatable inner race having a mounting portion integral with a rotatable member and having an annular first groove for rolling members formed in the outer peripheral surface thereof, an outer race fixedly disposed outside and concentrically with the inner race and having a second groove for rolling members formed in the inner peripheral surface thereof in opposed relationship with the first groove for rolling members, a plurality of rolling members interposed between the first and second grooves for rolling members, and a pair of seals disposed on the axially opposite outer sides of the rolling members for sealing the space between the inner and outer races; a pulser gear formed on that portion on the outer peripheral surface of the inner race which is positioned between the pair of seals and having convex portions and concave portions alternately formed circumferentially on the outer peripheral surface thereof; and a sensor mounted on the inner race and opposed to the pulser gear, the number of rotations of the rotatable member being detected by the pulser gear and the sensor.

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First Claim