End stop cap for a rolling bearing

An end stop cap for a rolling bearing for mounting in a railway axle box of a support device for a railway axle, the end stop cap being shaped as a concave disc delimited by an annular lateral wall having a lateral wall axis of symmetry which is coaxial in use with a bearing axis of symmetry, the end stop cap comprising:

• (a) an end wall positioned transversely to the lateral wall axis of symmetry, and
• (b) an elbow-shaped annular linking portion connecting the end wall to the annular lateral wall;
• the end wall being provided with a plurality of through holes for respective screws sized and located to fasten the cap to the axle, each of the plurality of through holes having a hole axis of symmetry which is parallel to the lateral wall axis of symmetry;
• the annular lateral wall terminating on an opposite side from the end wall in an annular frontal surface adapted to bear against a ring of the bearing;
• the end wall of the end stop cap having a thickness, measured parallel to the lateral wall axis of symmetry which is continuously variable along a second radial direction which intersects both the lateral wall axis of symmetry and the hole axis of symmetry of one of the plurality of through holes, the thickness being variable between a first maximum located at a position substantially intermediate between an inner edge of one of the plurality of through holes and the lateral wall axis of symmetry, a minimum thickness of the end wall along the second radial direction is measured perpendicular to an inner surface of the end wall and is located at a radially outer edge of the end wall;
• wherein the thickness of the wall as measured along a first radial direction which intersects the lateral wall axis of symmetry and passes between two adjacent holes has a respective second maximum in a position substantially intermediate between the two adjacent holes and along a circumference passing between the hole axis of symmetry of the two adjacent holes and the axis of symmetry of the bearing;
• wherein the end wall is delimited between an outer frontal surface facing in the opposite direction from the annular frontal bearing surface of the lateral wall and an inner frontal surface facing in the same direction as the annular frontal bearing surface of the lateral wall and delimiting, together with the lateral wall, a concavity of the cap adapted to be at least partially coupled to a free end of the axle;
• and
• the inner frontal surface of the end wall having a profile with at least one undulation.