Floating bearing cartridge for a turbocharger shaft

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

Patent

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Details

F16C 19/18 (2006.01)

Patent

CA 2658467

A bearing system for use in high speed rotating machinery, such as a turbocharger (14), wherein a shaft (12) is rotatably supported by a floating bearing cartridge ( 10) having axially spaced angular contact bearings (16, 18) each with a set of bearing balls (30) supported between inner and outer races (32, 34). The bearing cartridge includes an inner spacer sleeve (42) for axially spacing the inner bearing races, and a rotationally floating outer sleeve (46) having a pair of radially inwardly open grooves (52) for removably receiving snap-type retaining rings (54) which engage and axially space the outer bearing races. The axial dimension of the inner spacer sleeve is elongated slightly relative to an axial dimension defined between outboard faces of the installed retaining rings, thereby slightly unloading the sets of bearing balls from their respective outer bearing races. Such slight axial unloading enhances smooth- running operation with minimal bearing wear, while accommodating transient loads during operation.

L'invention concerne un système de roulement amélioré destiné à être utilisé dans des machines de rotation à vitesse élevée, un turbocompresseur par exemple, un arbre étant supporté de façon rotative par une cartouche de roulement flottant doté de roulements de contact angulaires axialement espacés, chacun présentant un ensemble de roulement à billes supporté entre des chemins internes et externes. La cartouche de roulement comprend un manchon espaceur interne pour espacer axialement les chemins de roulement internes, et un manchon externe flottant à rotation doté d'une paire de rainures ouvertes vers l'intérieur radialement pour recevoir de façon amovible des bagues de retenue de type à encliquetage qui engagent et espacent axialement les chemins de roulement externes. La dimension axiale du manchon espaceur interne est légèrement allongée par rapport à une dimension axiale définie entre les faces extérieures des bagues de retenue installées, déchargeant ainsi légèrement les ensembles de roulement à billes de leurs chemins de roulement externes respectifs. Une telle décharge axiale légère reduit les à-coups et minimise l'usure de roulement, tout en s'adaptant à des charges transitoires pendant le fonctionnement.

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