Methods of controlling the instability in fluid film bearings

Details Methods of controlling the instability in fluid film bearings Methods of controlling the instability in fluid film bearings

F - Mech Eng,Light,Heat,Weapons

16

C

F16C 32/04 (2006.01) F16C 17/02 (2006.01) F16C 17/24 (2006.01) F16C 33/02 (2006.01) F16C 39/06 (2006.01) H02K 7/09 (2006.01)

Patent

CA 2570052

A method of controlling the instability in fluid film bearings by using a magnetic bearing in combination with a fluid film bearing (whether it is a cylindrical journal bearing, an elliptic bearing, an offset-half bearing, a multi-lobe bearing, foil bearing or a tilting-pad bearing, does not really matter), wherein the fluid film bearing serves as the primary load carrying bearing and the magnetic bearing controls the instability of the fluid film bearing. This efficient combination results in bearings that can be used at high speeds without having neither stability nor reliability problems. An alternative method of controlling the instability in fluid film bearings is to disturb the flow in the axial direction, for example, a sleeve (journal) bearing can be manufactured such that the bearing axis is skewed with the shaft axis or a variable geometry bearing can be manufactured to allow for bearing angular misalignment.

Cette invention concerne un procédé permettant de palier l'instabilité des paliers à film liquide au moyen d'un palier magnétique combiné à un palier à film liquide (le type de ce dernier tourillon cylindrique, palier elliptique, demi-coussinet décalé, palier multi-lobe, palier-feuille ou palier à patins oscillants important peu). Ce procédé se caractérisé en ce que le palier à film liquide joue le rôle du palier supportant la charge principale alors que le palier magnétique réduit l'instabilité du palier à film liquide. L'efficacité de cette combinaison permet d'obtenir des paliers pouvant s'utiliser à des vitesses de rotation élevée en l'absence de problèmes de stabilité et de fiabilité. Pour réduire l'instabilité des paliers à film liquide, une variante consiste à perturber l'écoulement dans le sens axial. On peut par exemple fabriquer un palier dont l'axe porteur se trouve en biais par rapport à l'axe de l'arbre ou bien un palier à géométrie variable prenant en compte le défaut d'alignement angulaire du palier.

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