DRILLING BIT SUPPORT Russian patent published in 2018 - IPC E21B10/22 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to a rock cutting tool, namely, to the supports of roller bits. Support of the drill bit contains a pin, where a roller cutter is installed by means of a package of floating sleeves and a lock bearing. Floating package is made of three bushings made of a material with the different friction coefficients, at that for all bushings in the zones of maximum loading, certain mathematical expressions are observed when they slip relative to the roller cutter, trunnion and relative to each other.

EFFECT: such an implementation of the support allows to increase the service life.

1 cl, 3 dwg