Rock bit seal with multiple dynamic seal surface elements

Details Rock bit seal with multiple dynamic seal surface elements Rock bit seal with multiple dynamic seal surface elements

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/22 (2006.01) F16J 15/16 (2006.01)

Patent

CA 2324766

Seals of this invention comprise an annular elastomeric ring-shaped body having a dynamic surface disposed along a first body portion, the dynamic surface comprising at least two surface elements that project outwardly therefrom to provide multiple barriers to fluid and debris migration thereacross when placed into contact with a rock bit rotary dynamic surface. The seal dynamic surface includes a recessed portion disposed between the surface elements, and a static seal surface disposed along a second body portion. At least one of the surface elements includes a wear surface that is formed from a material that is more wear resistant than materials that are used to form a remaining portion of the seal. A preferred wear surface is one formed from a composite material comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material. Seals of this invention provide improved properties of both wear resistance and sealability when compared to conventional seals having a single dynamic seal surface.

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