Hydrodynamic lubricant seal for drill bits

Details Hydrodynamic lubricant seal for drill bits Hydrodynamic lubricant seal for drill bits

E - Fixed Constructions

21

B

255/74

E21B 10/22 (2006.01)

Patent

CA 1238896

HYDRODYNAMIC LUBRICANT SEAL FOR DRILL BITS ABSTRACT OF THE DISCLOSURE A hydrodynamic lubricant sealing element for devices such as rotary cone rock bits, shaft seals and the like which is maintained under sufficient mechanical compression to effect a seal between relatively movable structures. The sealing element defines a sealing surface establishing a seal interface with a relatively movable circular sealing surface and forms a lubricant interface and a contaminant interface at opposite sides thereof. The lubricant interface is of such configuration as to induce a hydrodynamic lubricant wedging activity causing migration of lubricant film in the seal interface from the lubricant interface to the contaminant interface for flushing away any contaminant and for lubrication between the sealing element and sealing surface. The contaminant is of a configuration developing substantially no such hydrodynamic wedging activity at the contaminant interface and yet presenting a scraping edge to remove contaminant material from the sealing surface upon relative axial movement of the sealing surface and sealing element.

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