| CPC F16C 33/7816 (2013.01) [F16C 33/46 (2013.01); F16C 33/78 (2013.01); F16J 15/324 (2013.01); F16C 33/7853 (2013.01)] | 28 Claims |
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1. A sealed bearing comprising:
an inner ring;
an outer ring having a seal fixing groove in an inner periphery of the outer ring, the outer ring being arranged radially outwardly of, and coaxially with, the inner ring;
a plurality of rolling elements disposed in an annular space defined between the inner ring and the outer ring;
an annular cage retaining the rolling elements; and
an annular seal member disposed at a first axial end opening of the annular space,
wherein the seal member comprises:
a metal core having a circular annular plate shape, and axially opposed to the cage; and
a rubber member vulcanization-bonded to the metal core,
wherein the rubber member includes:
an outer surface rubber portion bonded to an axially outer surface of the metal core;
an inner surface rubber portion bonded to an axially inner surface of the metal core;
an outer peripheral rubber portion extending radially outward from a radially outer end of the metal core, and the outer peripheral rubber portion being fitted in the seal fixing groove; and
a seal lip extending radially inward from a radially inner end of the metal core, and
wherein the inner surface rubber portion has a plurality of minute protrusions circumferentially spaced apart from each other, and kept in sliding contact with an axial side surface of the cage,
wherein the outer surface rubber portion covers an entire area of the axially outer surface of the metal core,
wherein the inner surface rubber portion has:
one or more first openings through which the axially inner surface of the metal core is exposed on a same circumference passing on a radially outer side of the minute protrusions; and
one or more second openings through which the axially inner surface of the metal core is exposed on a same circumference passing on a radially inner side of the minute protrusions.
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