Axlebox for a railway vehicle

An axlebox for a railway vehicle, comprising:

• a housing provided with a through bore extending along a central axis,
• a bearing unit housed in the bore, and
• a back cover having a cylindrical portion extending in bore of housing along the central axis and axially blocking the bearing unit, and an annular flange extending radially outwardly from the cylindrical portion and resting against a back surface of the housing,
• wherein the annular flange of the back cover includes a plurality of recesses on an outer circumference of the annular flange,
• the back surface of housing has a plurality of protruding portions that axially extend from the back surface, the protruding portions being of corresponding shape with the recesses of back cover,
• an inner groove provided at the root between the back surface of the housing and an inner side of each of the protrusions, of an arc-circle shape centered on the central axis, of inner diameter equal to or slightly higher than the outer diameter of the radial flange of back cover, and receiving flange portions of back cover,
• first anti-rotation means provided on flange of the back cover and the housing to prevent relative rotation between the back cover and housing in one rotation direction, and
• second anti-rotation means provided on flange of the back cover and housing to prevent relative rotation between the back cover and housing in the opposite rotation direction.