Dual functioning seal for rock bits

Details Dual functioning seal for rock bits Dual functioning seal for rock bits

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/22 (2006.01) F16J 15/32 (2006.01) F16J 15/34 (2006.01)

Patent

CA 2217592

Dual functioning seals for use in forming a lubricant seal in a rotary rock bit comprise an annular elastomeric seal body having a dynamic seal surface for sealing against a dynamic surface and a static seal surface for sealing against a static surface. The seal body has an asymmetric axial cross-sectional geometry the dynamic seal surface having a greater radius of curvature than that of the static seal surface. The dynamic and static seal surfaces are formed from different elastomeric materials, and the dynamic seal surface is formed from an elastomeric material that is harder and more wear resistant than the elastomeric material used to form the static seal surface. A rotary rock bit seal constructed in this manner is well adapted to accommodate the different operating conditions and sealing requirements that exist both at the dynamic and static surfaces of the seal to ensure optimal seal performance and, thereby enhance the service life of the rock bit.

Cette invention concerne des garnitures d'étanchéité double fonction pour trépan tricône caractérisées par un corps élastomère ayant une face d'étanchéité dynamique frottant contre une surface mobile et une face d'étanchéité statique en appui sur une surface fixe. Le corps de la garniture présente une section asymétrique, la face d'étanchéité dynamique ayant un rayon de courbure plus grand que la face d'étanchéité statique. Les deux faces de la garniture sont en élastomères aux caractéristiques différentes, celui de la face dynamique étant plus dur et plus résistant à l'usure que celui de la face statique. Un trépan tricône équipé de ce type de garniture d'étanchéité est bien adapté aux différentes conditions de fonctionnement et aux différents impératifs d'étanchéité de part et d'autre de la garniture d'étanchéité, la tenue optimale de ladite garniture ayant pour effet de prolonger la vie utile du trépan.

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