Bearing unit for windrowers

A bearing unit, comprising:

• a radially outer ring comprising a spherical radially outer surface with a convex shape, wherein the radially outer ring is stationary,
• a radially inner ring, rotatable around a central rotation axis (X) of the bearing unit, wherein the radially inner ring is configured to be mounted on a rotating or oscillating shaft;
• a plurality of rolling bodies interposed between the radially outer ring and the radially inner ring configured to allow the relative rotation of the radially outer ring and the radially inner ring,
• a first locking system configured to lock the radially inner ring on the rotating or oscillating shaft, the first locking system comprising:
• a diametrical through hole formed on a first cylindrical portion of the radially inner ring, the diametrical through hole housing an elastic element locking the radially inner ring on the rotating or oscillating shaft, the diametrical through hole extending across an entire diameter of the radially inner ring;
• and
• a second locking system configured to lock the radially inner ring on the rotating or oscillating shaft, the second locking system comprising:
• a pair of circumferentially spaced threaded through holes formed in one of the first cylindrical portion and a second cylindrical portion of the radially inner ring, the pair of threaded through holes being spaced apart by an angular distance (β) between axes of the pair of threaded through holes and housing respective grub screws locking the radially inner ring on the rotating or oscillating shaft.