Bearing arrangement

Details Bearing arrangement Bearing arrangement

F - Mech Eng,Light,Heat,Weapons

16

C

F16C 17/22 (2006.01)

Patent

CA 2207217

A device is proposed for centering a bearing bushing on a shaft wherein the bushing is made of a material, such as a ceramic, that is sensitive to tensile stress. At lower operating temperatures the bushing exhibits a degree of play relative to the shaft, but is play-free relative thereto at high operational temperatures. Correct centering of the bushing is ensured even in the higher temperature range by the provision of a pair of centering rings which are connected to the shaft without play and act on the bushing to center it. The centering rings are made of a material which, in comparison to the bushing, is not sensitive to tensile stress. It is expedient to provide the two centering rings at the end faces of the bushing. The clamping action of the centering rings on the bushing assures rotational pull of the bushing at low operating temperatures. The thermal expansion of the bushing and its associated clamping members approximately equals that of the corresponding shaft section to provide a butting driving connection between the shaft and the bushing at the higher operating temperature range.

L'invention concerne un dispositif permettant de centrer un coussinet (4) constitué d'un matériau sensible aux contraintes de traction, tel que la céramique, sur un arbre (1) présentant à basse température de service un jeu par rapport au coussinet (4). L'invention vise à assurer un centrage correct du coussinet (4), même sur une plage de température élevée. A cet effet, au moins une bague de centrage (5), constituée d'un matériau non sensible aux contraintes de traction par rapport à l'arbre (1), est solidaire de l'arbre (1) sans jeu. Cette bague de centrage (5) agit de l'extérieur sur le coussinet (4) afin d'assurer le centrage de ce dernier. Il est prévu, de façon appropriée, de placer deux bagues de centrage (5) sur la face du coussinet (4). Afin qu'une dilatation thermique n'affecte pas l'entraînement en rotation du coussinet (4) par un blocage entre les bagues de centrage (5), la dilatation thermique des pièces (5, 6) du côté du coussinet doit être pratiquement égale à celle de la partie de l'arbre correspondante.

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