SUPPORT OF BORING ROCK-BREAKING TOOL Russian patent published in 2009 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: invention is related to supports of rock-breaking tool of roller cutter type, namely to supports of boring bits, calibrators and expanders. Support comprises journal, roller cutter installed in it, and sliding bearings with cemented layer and dead holes from the side of loaded part. Specific feature of support consists in the fact that at least one of sliding bearings from the side of loaded part is arranged with flat and is equipped with insert, which has dead holes on its facet that adjoins flat, besides insert is rigidly connected to journal, and distance between external surface of insert and bottom of dead holes makes not less than permissible value of journal wear. Version is provided for support arrangement with key with cross section in the shape of two dovetails symmetrically arranged relative to its longitudinal axis, and journals and insert from the side of flat with grooves of response shape for key installation. According to other versions, journal and insert are arranged with response protrusions and grooves on adjacent surfaces.

EFFECT: improved wear resistance and serviceability of the whole rock-breaking tool and simplified technology of support making and installation.

6 cl, 6 dwg