| 摘要 |
<p>The invention concerns a packing seal with its lip (1) placed in a toroidal housing (2) of a part (3) mobile in rotation and/or translation relatively to a part (4) and whereof the lip (5) ensuring the seal between the lining and the part (4) exerts on said part (4) an almost constant force whatever the pressure and whereof the support diameter can be maintained also almost constant whatever the temperature. Said pressure and temperature compensation is obtained by giving the ring (6) an L-shape and by causing the lip (5) corresponding to the vertical portion of the L-shape to pivot by rotation or flexion of the horizontal portion (7) under the effect of pressure to increase the contact pressure of the lip (5) on the part (4) and by placing in the lower part of the horizontal portion (7) an insert (11) with greater thermal expansion coefficient causing flexion of the horizontal portion (7) for a rise in temperature and by rotating the lip (5) to maintain its contact diameter constant, despite the mean diameter increase of the ring (6).</p> |
