| 摘要 |
<p>A sealing unit (100B) including a first annular shield (107) in use rotating, a second annular shield (108), in use fixed and arranged in front of the first shield for delimiting therebetween a first annular chamber (109) and a sealing ring (114) provided with at least a first and a second annular lips (115, 116) which extend axially and radially projecting from a flange portion (113) of the second shield and towards a flange portion (112) of the first shield, inside the annular chamber; the first shield integrally supports a third annular lip (118) which extends projecting from the first shield (107) towards one of the first and second lips without touching it for defining a second dynamic labyrinth seal (119) between the first and second shield (107,108) and inside the annular chamber (109).</p> |
