| 摘要 |
<p>1369359 Bearings DRESSER INDUSTRIES Inc 16 Feb 1972 [2 March 1971] 7181/72 Heading F2A [Also in Division E1] A bearing, e.g. of an earth boring tool, having at least one bearing surface having a roughness of greater than 50 RMS has a lubricant including an anti-galling material between the surfaces. Preferably the anti-galling material consists of particles entrained in the lubricant. The particles may be of silver, copper, aluminium, lead, zinc, tin, babbitt or graphite, and may constitute 15% of the lubricant/particle mixture. The rotatable cutter of the earth boring tool is mounted on a journal 18 located on a drill string bit. Bearing pads are provided on the journal to support the cutter. The cutter is held in position by bearing balls 21 which are introduced between the cutter and journal through a bore 22 which is closed with a plug 23. Lubricant is fed to the bearings through the bore 23 from a reservoir 26 which is closed by a flexible diaphragm 32 which provides compensation for pressure changes.</p> |
