SUPPORT OF BORING ROCK-BREAKING TOOL (VERSIONS) 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 drill bits, calibrators and expanders. Suggested support comprises journal, roller cutter installed in it, and slide bearings with cemented layer and dead holes from the side of loaded part. Specific feature of support, according to the first version, consists in the fact that it is equipped with cylindrical bush, which is rigidly installed on journal and is arranged with dead holes provided on its internal surface. At the same time bush is made with cemented layer, thickness of which is not less than permissible value of slide bearing wear. According to another version, specific feature of suggested support consists in the fact that at least one of slide bearings from the side of loaded part is equipped with insert with cross section in the form of segment and dead holes, at the same time slide bearing from the side of loaded part is arranged with flat for flat facet of insert, and dead holes are made from the side of flat facet of insert.

EFFECT: improved wear resistance and serviceability of the whole rock-breaking tool.

2 cl, 3 dwg