Lubricant pump and cone movement dampener

Details Lubricant pump and cone movement dampener Lubricant pump and cone movement dampener

E - Fixed Constructions

21

B

E21B 10/22 (2006.01) E21B 10/24 (2006.01)

Patent

CA 2478191

A lubricant pump and cone movement dampener system for a rolling cone cutter of an earth-boring bit is disclosed. The system includes an axial bore passing through the end of journal pin. The axial bore is fitted with a unidirectional valve and is in fluid communication with the bit's lubricant and with a grease passage. Lubricant, such as a grease, is pumped through the grease passage in the cone cutter, where it passes through the valve, out of the bore, and into the journal gap formed by the interior of the cone cutter and the exterior of the journal pin. Axial movement of the cone caused by formation forces acting upon the cone cutter as it rotates in the borehole causes more lubricant to be drawn into the journal gap. When the cone moves axially back in the opposite direction, heated lubricant in the gap is expelled from the gap via holes within the ball race of the journal pin. The system cycles cooler grease through the gap, dampens axial cone movement and reduces damage to the journal seal.

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