Spaced button thrust surface for earth boring bit

Details Spaced button thrust surface for earth boring bit Spaced button thrust surface for earth boring bit

E - Fixed Constructions

21

B

255/74

E21B 10/22 (2006.01) F16C 33/26 (2006.01)

Patent

CA 1186301

ABSTRACT OF THE DISCLOSURE An earth boring bit has thrust surfaces with enhanced cooling features. The bit has a body with three depending bearing pins. A cutter having an axial cavity is mounted on each bearing pin. The bearing pin and the cavity have one or more mating thrust surfaces that are perpendicular to the axis of the bearing pin. These thrust surfaces absorb outward forces that the cutter imposes on the bearing pin. At least one of the thrust surfaces consists of a series of tungsten carbide buttons spaced in a circular array. These buttons have flat ends for engaging the opposite thrust surfaces. The buttons protrude from the supporting metal, allowing cooling fluid to be circulated past to cool the thrust surfaces.

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