PROBLEM TO BE SOLVED: To provide an angular contact ball bearing, a double-row contact ball bearing, and a roller bearing, capable of reducing torque, preventing leakage of grease, attaining dust proofing performance, and saving the space simultaneously and inexpensively.;SOLUTION: The angular contact ball bearing includes a crown-shaped retainer 5 having a recess, and a sealing member 6 having a projection Tk in the inner surface of a seal lip SL. The projection Tk is composed so that when the seal lip SL is forcibly inserted into the inside by the pressure difference occurring between the outside and inside of the bearing, the projection Tk is brought into contact with the inside surface of a seal groove 10, and can be displaced between a state where an air passage is formed by deforming the seal lip SL partially and elastically, and a state where the projection Tk is not brought into contact with the inside surface of a seal groove 10 when the pressure difference does not occur.;COPYRIGHT: (C)2010,JPO&INPIT
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