ROLLER CUTTER DRILLING TOOL BEARING ASSEMBLY (VERSIONS) Russian patent published in 2009 - IPC E21B10/25 

FIELD: mechanics.

SUBSTANCE: invention refers to well drilling and can be used in various types of rock destruction tool with sealed oil-filled bearing assembly in drilling bits, expanding tools and calibrating devices. Bearing assembly of roller cutter rock destruction tool includes journal, rolling cutter fixed on it by means of bearing, and sealing assembly installed between rolling cutter and journal; at that, as per the first version, sealing assembly is installed in annular groove of journal, and as per the second version - in annular bore on internal surface of rolling cutter. Peculiar feature of bearing assembly as per the first version is sealing assembly in the form of two concentrically installed cylinders, outer one of which on internal surface, and inner one on external surface are provided with annular bores and groove respectively for spring split rings; at that, in each sealing assembly there used is at least three spring split rings, two of which when in a free state have outer diametre that is bigger than that of the corresponding annular bores of external cylinder, and are installed in its end sections, and the third spring split ring arranged between them on external surface of smaller cylinder has when in a free state an inner diametre that is less than outer diametre of the corresponding annular bore of internal cylinder. As per the second version, installation scheme of split rings is opposite to the first version. Invention is developed in dependent claims.

EFFECT: improving operability of rock destruction tool.

6 cl, 5 dwg