Outer race rotation bearing

An outer race rotation bearing for an engine pulley, said outer race rotation bearing comprising:

• an inner race which is stationary;
• an outer race which is rotatable;
• a plurality of rolling elements arranged between the inner race and the outer race, wherein an annular space is defined between the inner race and the outer race;
• and
• a pair of seals which close respective axial ends of the annular space;
• the seals each including a metal core and an annular mounting portion encasing a radially outer end of the metal core, the annular mounting portion being formed of a rubber elastic member and fitted in a respective annular groove formed in an inner peripheral surface of the outer race in such a manner that the annular mounting portion maintains the radially outer end of the metal core out of contact with the outer race;
• wherein the elastic member has an axially inward surface opposing an axially inward surface of the annular groove;
• wherein a lubricant is sealed in the annular space;
• wherein a radially inward edge of the elastic member of each of the seals is provided with an elastic lip configured to protrude toward an interior of the bearing when the elastic lip is in an unbiased state such that, if the axially inward surface of the elastic member is separated from the axially inward surface of the annular groove, the elastic lip of each of the seals remains in contact with a groove edge portion at a radially inward edge of the annular groove, the elastic lip of each of the seals being configured such that a ratio of a radial thickness T of the elastic lip to an axial height H of the elastic lip is less than or equal to 1 and greater than or equal to ½;
• wherein the annular groove has an axial inner edge portion and an axial outer edge portion connected by a bottom, the groove edge portion being the axial inner edge portion and having a circular arc cross-section, wherein the groove edge portion is entirely covered by the elastic lip of the elastic member;
• wherein the metal core of each of the seals has a protruding portion protruding radially outwardly beyond the groove edge portion, the protruding portion having a radial length larger than half a radial distance between the groove edge portion and the bottom of the annular groove;
• and
• wherein the elastic member of each of the seals has a seal lip in sliding contact with the inner race.