BIT WITH SEALED BEARING Russian patent published in 2011 - IPC E21B10/25 

FIELD: mining.

SUBSTANCE: drilling bit with sealed bearing includes housing consisting of welded sections of lugs on the trunnions of which there fixed in movable way are cutters with rock destruction teeth and cavities of bearings with end seals in the form of contact and pressure members; at that, protective annular recess with inner partition is provided in end cavity for the cutter in order to arrange contact seal ring. The above partition is formed on one side with surface of cutter contact with large slide bearing, and on the other side - with restricting cylindrical or other annular surface. At that, ratio of depth of contact surface of protective annular recess H_n to depth of lower edge of partition from the place of cutter bottom h_n corresponds to the following inequation: H_n>h_n. Elastic stop ring can be also installed between blades and edge of leg under contact ring.

EFFECT: higher reliability and longer service life of drilling bit with sealed sleeve bearing.

7 dwg