PLAIN SELF-CENTRING BEARING

The present description relates to a mechanical assembly of two mechanical components rotating one with respect to the other making it possible to obtain a self-centring fluid bearing; it comprises a first component provided with a cylindrical cavity, a second component (34) comprising at least one cylindrical portion engaged in the cylindrical cavity of the first component, a space separating the cylindrical portion and the wall of the cylindrical cavity so as to allow relative movement of rotation between the first and the second component (34), and a lubricant distribution network (37, 38) configured to supply said gap with a fluid lubricant so as to form a fluid bearing; a first surface (34s) out of the lower surface of the cylindrical cavity of the first component and the outer surface of the cylindrical portion of the second component is equipped with at least two lubricant inlet orifices (39a, 39b) distant from one another by more than 120° about the main axis (F) of the first surface (34s), and the first surface (34s) also has at least one circumferential groove (40a) extending circumferentially, in the direction of relative rotation of the second of said surfaces with respect to the first surface (34s), from the vicinity of a first lubricant inlet orifice (39a) over at least 100°. Le présent exposé concerne un ensemble mécanique de deux pièces mécaniques tournant l'une par rapport à l'autre permettant d'obtenir un palier fluide auto-centrant ; il comprend une première pièce munie d'une cavité cylindrique, une deuxième pièce comprenant au moins une portion cylindrique engagée dans la cavité cylindrique de la première pièce, un interstice séparant la portion cylindrique et la paroi de la cavité cylindrique afin de permettre un mouvement relatif de rotation entre la première et la deuxième pièce, et un réseau de distribution de lubrifiant configuré pour alimenter ledit interstice avec un lubrifiant fluide de manière à former un palier fluide. Il concerne aussi un organe de transmission, du type train épicycloïdal, comportant un tel ensemble, et une turbomachine correspondante.