O-ring seal for rock bit bearings

Details O-ring seal for rock bit bearings O-ring seal for rock bit bearings

E - Fixed Constructions

21

B

E21B 10/00 (2006.01) E21B 10/22 (2006.01)

Patent

CA 2144363

An improved O-ring seal for rock bit bearings is formed from a resilient elastomeric composition comprising a multiplicity of low friction wear resistant particles distributed uniformly throughout the composition. The low friction wear resistant particles can have a rounded or non-rounded configuration. The low friction wear resistant particles located near the surface of the O-ring are exposed through wear of the elastomeric component to form wear pads that contact adjacent rotating rock bit sealing surfaces. The wear pads serve to reduce the break-off friction between the adjacent sealing surfaces and minimize the occurrence of stick-slip, thereby enhancing the service life of the O-ring seal and rock bit.

Un joint torique amélioré pour roulement d'outil de forage est composé d'un matériau élastomérique souple comprenant une multiplicité de particules à faible frottement résistant à l'usure distribuées uniformément dans la composition. Les particules à faible frottement résistant à l'usure peuvent être de forme arrondie ou non. Les particules à faible frottement résistant à l'usure qui sont situées près de la surface du joint torique sont exposées par l'usure de la composante élastomérique de manière à former des plaques d'usure qui viennent en contact avec les surfaces de scellement adjacentes de l'outil de forage rotatif. Les plaques d'usure servent à réduire le frottement de rupture entre les surfaces de scellement adjacentes et minimisent l'occurence de la marche saccadée, ce qui améliore la durée de vie du joint torique et de l'outil de forage.

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