Hydrodynamic rotary seal with opposed tapering seal lips

F - Mech Eng,Light,Heat,Weapons – 16 – J

Patent

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Details

F16J 15/32 (2006.01) F16J 15/54 (2006.01) E21B 33/00 (2006.01)

Patent

CA 2601282

A hydrodynamically lubricating rotary seal for partitioning a lubricant from an environment has a generally circular seal body and sloping, generally opposed projecting static and dynamic lips. The dynamic sealing lip is provided for establishing compressed sealing relation with a relatively rotatable surface, and has a sloping dynamic sealing surface that varies in width, and also has a hydrodynamic inlet curvature that varies in position around the circumference of the seal. When the seal is installed against a relatively rotatable surface, the dynamic sealing lip deforms to define a variable width interfacial contact footprint against the relatively rotatable surface that is wavy on the lubricant side, and wedges a film of lubricating fluid into the interface in response to relative rotation. The environment edge of the interfacial contact footprint is substantially circular, and therefore does not produce a hydrodynamic wedging action in response to relative rotation.

L'invention concerne un élément d'étanchéité rotatif hydrodynamique pour extraire un lubrifiant d'un milieu. Ledit élément d'étanchéité comporte un corps généralement circulaire et des lèvres statiques et dynamiques inclinées et généralement opposées. La lèvre d'étanchéité dynamique sert à établir une relation d'étanchéité comprimée avec une surface relativement rotative et comporte une surface d'étanchéité dynamique inclinée qui varie en largeur, ainsi qu'une courbure d'entrée hydrodynamique dont la position autour de la circonférence de l'élément d'étanchéité varie. Lorsque l'élément d'étanchéité est installé contre une surface relativement rotative, la lèvre d'étanchéité dynamique se déforme pour définir une empreinte de contact interfacial à largeur variable par rapport à la surface relativement rotative, qui est ondulée du côté lubrifiant, et coince une pellicule de fluide lubrifiant dans l'interface en réponse à la rotation relative. L'extrémité externe de l'empreinte de contact interfacial est sensiblement circulaire et, par conséquent, ne produit pas une action de coinçage hydrodynamique en réponse à une rotation relative.

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