SEALED BEARING STRUCTURE OF DRILLING BIT Russian patent published in 2012 - IPC E21B10/24 

FIELD: mining.

SUBSTANCE: sealing assembly is equipped at least with two metal rings with inclined end faces. Inclined end faces contact a sealing ring. The latter is made in T-shaped cross section. At that, metal rings are installed in annular groove between trunnion and transverse parts of sealing ring.

EFFECT: such design of bearing structure allows simplifying the bearing structure manufacturing technology and improving the sealing reliability, and as a result, reducing the bit cost and protecting the bearing structure cavity against slurry penetration.

1 cl, 2 dwg