| 摘要 |
A sealing system is provided which is intended to achieve an improvement in durability. A dust seal is composed of a first dust seal and a second dust seal which is arranged at a location nearer to an atmospheric air side than the first dust seal, wherein each of the first dust seal and the second dust seal has a seal lip formed so as to be slidable with respect to an outer peripheral surface of the shaft. The first dust seal has seal lips made of urethane rubber, and the second dust seal has only a single seal lip which is made of a rubber higher in flexibility than urethane rubber, and which extends toward the atmospheric air side.
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