Lubricant volume displacement system for a rotary rock bit

Details Lubricant volume displacement system for a rotary rock bit Lubricant volume displacement system for a rotary rock bit

B - Operations, Transporting

21

K

76/21

B21K 5/02 (2006.01) B23P 19/04 (2006.01) E21B 10/24 (2006.01) F16C 33/66 (2006.01)

Patent

CA 1104383

LUBRICANT VOLUME DISPLACEMENT SYSTEM FOR A ROTARY ROCK BIT Abstract of the Disclosure A rotary rock bit is provided having a lubrication system with an expansion space within the lubricant reservoir to accommodate changes in lubricant volume. A flexible dia- phragm is located within the lubricant reservoir. The lubri- cant reservoir is filled with lubricant thereby moving the flexible diaphragm to a substantially completely filled position. A predetermined volume of lubricant is displaced from the lubricant reservoir by forcing a fluid through pas- sage means in the reservoir cap, moving the flexible diaphragm and displacing a predetermined volume of lubricant thereby providing an expansion space within the lubricant reservoir.

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