Railcar adapter for connecting a railcar body to a bearing

A railcar adapter assembly comprising:

• a railcar adapter,
• a bearing mounted inside the railcar adapter,
• a backing ring adapted to come into axial contact with the bearing at a first side, and
• an end cap assembly adapted to come into axial contact with the bearing at another side, opposite to the first side, the railcar adapter comprising an adapter body having:
• two lateral channels each delimited by a pair of opposed lugs and a lateral surface perpendicular to the opposed lugs, the lateral channels being adapted to cooperate with the railcar body,
• two frontal surfaces,
• an inner surface acting as a bearing seat for the bearing, and
• an outer surface,
• wherein each of the two frontal surfaces of the railcar adapter define two frontal flanges that inwardly protrude with respect to the inner surface, and that delimit with the inner surface a housing for the bearing,
• wherein the railcar adapter is further provided with a top cover mounted onto the outer surface of adapter body, the top cover having an outer side with an upper central groove extending along an axis parallel to the axis of rotation of the bearing, the top cover having two outer surfaces on both sides of the upper central groove and adapted to be in direct radial contact with the railcar body, the top cover having first and second lateral ends each of which is flush with an associated lateral edge of the adapter body as defined by the pair of opposed lugs and the lateral surface, and
• wherein the outer surface of top cover, in cross-section through the axis of rotation of bearing, is curved.