Bearing means for rotary drill bits

Details Bearing means for rotary drill bits Bearing means for rotary drill bits

E - Fixed Constructions

21

B

255/78

E21B 10/00 (2006.01) E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16C 17/04 (2006.01) F16C 33/12 (2006.01)

Patent

CA 1081206

ABSTRACT OF THE DISCLOSURE Bearing means for unsealed rotary drill bits comprises a drill body having at least one bearing shaft on which a roller with cutting inserts is rotatably mounted, bearing systems for supporting the roller on the shaft and a channel terminating at the end surface of the bearing shaft for air flushing of the bearing means. The bearing system comprises an axial bearing, one bearing surface of which is provided by a plate of a sintered hard metal alloy, the other bearing surface being provided by a supporting plate of a less hard and wear resistant material, such as steel, which is provided with a solid lubricant, the plate being pressed into the end surface of the bearing shaft in such a way that it is cooled from the rear side by the cooling air supplied through the flushing channel.

304647

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