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In a sealed thrust bearing providing a case which is formed of a corrosion resisting material and fixedly fitted to an outer race, an outer seal ring which is fixedly fitted to the outer peripheral edge of an inner race, and an inner seal ring which is fixedly fitted to an inner flange, the outer pe

In a sealed thrust bearing providing a case which is formed of a corrosion resisting material and fixedly fitted to an outer race, an outer seal ring which is fixedly fitted to the outer peripheral edge of an inner race, and an inner seal ring which is fixedly fitted to an inner flange, the outer peripheral edge of a first outer seal lip forming the outer seal ring is slidingly contacted with the inner peripheral surface of the outer cylindrical portion of the case. The end edge of a first inner seal lip forming the inner seal ring is slidingly contacted with the flat portion of the case. In the inner peripheral edge of the flat portion, an inner cylindrical portion is so formed as to cover the sliding contact portion between the end edge of the first inner seal lip. The sealed thrust bearing can prevent the sliding contact portions thereof from being worn greatly even if rain, mud or the like splash on them.

대표청구항 ▼

A sealed thrust bearing, comprising: an annular-shaped outer race including an outer raceway on a surface thereof; an annular-shaped inner race including an inner raceway on a surface thereof and a cylindrical inner flange formed in an inner peripheral edge of the inner race and projecting from a si

A sealed thrust bearing, comprising: an annular-shaped outer race including an outer raceway on a surface thereof; an annular-shaped inner race including an inner raceway on a surface thereof and a cylindrical inner flange formed in an inner peripheral edge of the inner race and projecting from a side of the inner raceway; a plurality of rolling elements interposed rollably between the outer and inner raceways, and bearing a load between the outer race and the inner race in a thrust direction of the sealed thrust bearing; an annular-shaped outer seal ring fixedly fitted to an outer peripheral edge of the inner race; an annular-shaped inner seal ring fixedly fitted to an end edge portion of the inner flange of the inner race; and a case formed in an annular shape and fixedly fitted to the outer race, the case including: an annular-shaped flat portion; an outer cylindrical portion formed in an outer peripheral edge of the flat portion; and an inner cylindrical portion formed in an inner peripheral edge of the flat portion and having an outside diameter that is smaller than an inside diameter of the outer race; wherein the outer cylindrical portion and the inner cylindrical portion are bent in the same direction, and fitted over the outer race so as to cover the outer seal ring and the inner seal ring, respectively, wherein the outer seal ring comprises an elastic member including a first outer seal lip in sliding contact with an inner peripheral surface of the outer cylindrical portion of the case and a second outer seal lip in sliding contacting with a surface of the outer race that is close to an outer periphery of the outer race, each of the first and the second outer seal lips extending radially in a diametrical cross sectional direction of the sealed thrust bearing from the outer peripheral edge of the inner race inside the outer cylindrical portion, wherein the inner seal ring comprises an elastic member including a first inner seal lip in sliding contacting with an inner peripheral surface of the flat portion of the case and a second inner seal lip in sliding contact with an inner peripheral edge of the outer race, each of the first and the second inner seal lips extending radially in the diametrical cross sectional direction from the end edge portion of the inner flange inside the inner cylindrical portion.