An intermediate lip (45) extends between the two outer lips and has the tip end divided into two directions. The inner race has on its outer peripheral surface adjacent to the end a concave seal groove (25) having an inner shoulder and an outer shoulder having a diameter smaller than that of the inner shoulder. The inner lip of the sealing plate cooperates with the inner shoulder (23) of the seal groove to form an inner sealing portion between the inner lip and the inner shoulder. The outer lip of the sealing plate cooperates with the outer shoulder (27) of the seal groove to form an outer sealing portion between the outer lip and the outer shoulder. At least one of the bifurcated lips (451,452) of the intermediate lip contacts the side wall of the seal groove to form an intermediate sealing portion.
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