Railcar adapter for connecting a railcar body to a bearing

A railcar adapter, for connecting a railcar body to a bearing having a bearing axis of rotation, the railcar adapter comprising:

• an adapter body defining two lateral channels each extending parallel to the bearing axis of rotation and each delimited by a pair of opposed lugs, and
• each of the two lateral channels are defined by a curvilinear portion of the adapter body which terminates in a lateral surface perpendicular to the opposed lugs, each of the two lateral channels being adapted to cooperate with the railcar body,
• the adapter body having an inner surface acting as a bearing seat for the bearing, and
• wherein the curvilinear portion of the adapter body which defines each of the two lateral channels forms a recess inwardly into the inner surface and defines a curvature such that the curvilinear portion joints a portion of a side of the lateral channel perpendicular to the lateral surface, wherein the curvilinear portion does not reduce lateral thickness of an adjacent one of the opposed lugs;
• an outer surface in radial contact with the railcar body, the inner surface having at least one central groove located on a first axis of symmetry (A1) of the railcar adapter emerging in each lateral channel, the at least one central groove extending circumferentially around the bearing and being perpendicular to the two lateral channels;
• wherein the inner surface is provided with a second central groove located on a second symmetry axis (A2) of the railcar adapter, perpendicular to the first symmetry axis (A1), the second central groove being parallel to the two lateral channels and being configured such that while the adapter body is in direct radial contact with the bearing, the adapter body does not centrally contact the bearing.