Hydrostatic shoe for controlled crown roll

Details Hydrostatic shoe for controlled crown roll Hydrostatic shoe for controlled crown roll

D - Textiles, Paper

21

G

D21G 1/02 (2006.01) F16C 13/00 (2006.01)

Patent

CA 2266934

A controlled crown roll utilizes a crown support piston (76) with a glide shoe (78) with a cavity (80) in the face of the glide shoe centered under the nip loading line. The cavity is surrounded by a land area (83), the majority of which is located away from the nip load. Use of a low vis- cosity hydraulic fluid, for example, 15.6 cP, with a hydraulic film thickness of 0.002 inches, results in significantly lower fric- tion between the glide shoe and the interior surface (40) of the rotating mantle. Re- cesses in the piston sides form hydrostatic thrust bearings (82) which perform the cen- tering function for the piston and the glide shoe.

Ce cylindre à régulation de bombement utilise un piston de support de bombé (76) porteur d'un patin de glissement (78) pourvu d'une cavité (80) ménagée au centre dudit patin sous la ligne de charge de contact. La cavité est ménagée dans une surface de contact (83) dont la majeure partie est à une certaine distance de la charge de contact. L'utilisation d'un fluide hydraulique de faible viscosité, de 15,6 cPo notamment, d'une épaisseur pelliculaire de 0,002 pouce, réduit, de manière significative, le frottement entre le patin de glissement et la surface interne (40) de la chemise animée d'un mouvement de rotation. Des évidements ménagés dans les régions latérales du piston constituent des butées hydrostatiques (82) contribuant au centrage du piston et du patin de glissement.

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