Hydrodynamic pump passages for rolling cone drill bit

Details Hydrodynamic pump passages for rolling cone drill bit Hydrodynamic pump passages for rolling cone drill bit

E - Fixed Constructions

21

B

E21B 10/24 (2006.01)

Patent

CA 2556804

An earth boring bit has rotating cones with two lubricant passages to increase bearing capacity and cause lubricant circulation. A lubricant reservoir in the body supplies lubricant to passages between the cone and bearing pin. A pressure compensator equalizes lubricant pressure to the exterior of the bit. A first passage leads from the reservoir to the upper side of the bearing pin. A second passage leads from the reservoir to the bearing pin at a point from 185 degrees to 225 degrees as seen from an inner end of the bearing pin. This point is located in a diverging region 51d of an annular clearance surrounding the bearing pin.

L'invention concerne un trépan de forage de terrain muni de molettes rotatives comprenant deux passages de lubrifiant permettant d'accroître la capacité de roulement et de faire circuler le lubrifiant. Un réservoir de lubrifiant situé dans le corps, alimente en lubrifiant les passages formés entre la molette et la broche de palier. Un compensateur de pression équilibre la pression du lubrifiant avec l'extérieur du trépan. Un premier passage relié le réservoir à la face supérieure de la broche de palier, et un second passage relie le réservoir à la broche de palier en un point formant un angle compris entre 185 degrés et 225 degrés par rapport à l'extrémité interne de la broche de palier. Ce point est situé dans une zone (51d) déviée d'un espace annulaire entourant la broche de palier.

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