SEAL ASSEMBLY AND A ROLLER CONE DRILL BIT COMPRISING SUCH A SEAL ASSEMBLY

摘要

The invention concerns a seal assembly for sealing between a fixed member and a rotatable member adapted for rotating around an axis in relation to said fixed member. The seal assembly comprises a first ring member adapted for being fitted in or on said fixed member circumferentially around said axis and having a first surface; a second ring member adapted for being fitted circumferentially in or on said rotatable member and having a second surface facing said first surface along a length; and a third ring member between said second and said first surface, the distance between said second surface and said first surface being larger at the middle of said length and becoming smaller towards the extremities thereof.