Rotary seal with improved film distribution

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

Patent

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Details

F16J 15/32 (2006.01) F16J 15/16 (2006.01)

Patent

CA 2697678

The present invention is a generally circular rotary seal that establishes sealing between relatively rotatable machine components for lubricant retention and environmental exclusion, and incorporates seal geometry that interacts with the lubricant during relative rotation to distribute a lubricant film within the dynamic sealing interface. The features of a variable inlet size, a variable dynamic lip flank slope, and a reduction in the magnitude and circumferentially oriented portion of the lubricant side interfacial contact pressure zone at the narrowest part of the lip, individually or in combination thereof, serve to maximize interfacial lubrication in severe operating conditions, and also serve to minimize lubricant shear area, seal torque, seal volume, and wear, while ensuring retrofitability into the seal grooves of existing equipment.

La présente invention se rapporte à un joint d'étanchéité rotatif globalement circulaire qui crée une étanchéité entre des pièces mécaniques relativement rotatives pour la rétention de lubrifiant et l'exclusion d'agents contaminants de l'environnement, et qui incorpore une géométrie de joint d'étanchéité qui interagit avec le lubrifiant pendant une rotation relative afin de distribuer un film lubrifiant dans l'interface d'étanchéité dynamique. Les caractéristiques d'une taille d'entrée variable, d'une inclinaison de flanc de lèvre dynamique variable, et d'une réduction de l'amplitude et de la partie circonférentiellement orientée de la zone de pression à contact interfacial du côté lubrifiant dans la partie la plus étroite de la lèvre, individuellement ou en association, servent à maximiser la lubrification interfaciale dans des conditions de fonctionnement rudes, et servent également à minimiser la zone de cisaillement de lubrifiant, le couple du joint d'étanchéité, le volume du joint d'étanchéité, et l'usure, tout en garantissant une capacité d'adaptation dans les rainures de joint de l'équipement existant.

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