| 摘要 |
A sealing device has a protection ring having a first step and a second step formed with the first step. A sleeve ring is received in the protection ring in a water proof manner. The sleeve ring has a first metal ring, a first rubber ring securely bonded to a side of the first metal ring and having a dust proof lip extending out of the first rubber ring to engage with a face of the protection ring to define therebetween a first gap. A sealing ring is received in the protection ring and engaged with the sleeve ring. The sealing ring has a second dust proof lip extending out of the second rubber ring to engage with a face of the second metal ring of the sleeve ring.
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