Rolling element cage constraint

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

Patent

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Details

F16C 29/00 (2006.01) B41F 7/00 (2006.01) B41F 7/20 (2006.01) F16C 29/04 (2006.01) H01J 37/20 (2006.01)

Patent

CA 2071085

An improved linear bearing assembly comprising sets of guides (ways) for guiding rolling elements (ball bearings or rollers) constrained within a cage. Typically, two sets of rolling elements and cages are used between a moving part and a stationary part. Each set has four resilient elements (springs) with one end of each spring anchored to the cage and with the other ends of two springs anchored to the stationary way or part and the other ends of the other two springs are anchored to the movable way or part. This arrangement provides a restoring spring force that gradually forces the cage to its correct tracking position. If the cage is tracking properly, the spring forces cancel out and there is no inherent rubbing in the restoring mechanism.

Cette invention concerne un palier linéaire amélioré comprenant plusieurs jeux de guides (chemins) recevant des éléments roulants (billes ou rouleaux) placés dans une cage. Typiquement, deux jeux d'éléments roulants et de cages sont interposés entre une pièce mobile et une pièce fixe. Chaque jeu comprend quatre éléments élastiques (ressorts) ancrés par une extrémité à la cage et, par l'autre, à la voie de guidage ou pièce fixe dans le cas de deux d'entre eux et à la voie de guidage ou pièce mobile dans le cas des deux autres. Selon cet agencement, il se produit une force élastique de rappel qui force graduellement la cage à se recentrer. Lorsque la cage est bien centrée, les forces de rappel s'annulent et le mécanisme de rappel fonctionne sans friction aucune.

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