Abstract: The invention concerns a bearing unit (10), for an axlebox (1) of a railway vehicle, the bearing unit (10) being centered on a central axis (X10) and comprising a bearing (20) configured to support an axle (6) of a wheelset. The bearing unit (20) also comprises an annular sleeve (30) provided with an outer periphery configured for mounting in an annular bore of a housing (2) of the axlebox (1) and an inner periphery configured for receiving the bearing (20); and a plurality of anti-rotation means (422) distributed at the outer periphery of the annular sleeve (30), for preventing rotation of the annular sleeve (30) in the housing (2) of the axlebox (1). The invention also concerns an axlebox (1) comprising such a bearing unit (10), a railway vehicle comprising such an axlebox (1) and a maintenance process for such an axlebox (1).

Abstract: The invention relates to a bearing unit for use in an axlebox of a railway vehicle, including a bearing having an inner ring and a metallic outer ring and rolling elements arranged therebetween. The bearing is configured to support an axle of said railway vehicle. Further, a sleeve surrounding the outer ring of the bearing is provided. It is proposed that the sleeve is made of a non-metallic material.