Bearing unit with rolling bodies with a co-molded inner ring

A bearing unit comprising:

• a radially outer ring stationary with respect to an axis of rotation;
• a radially inner ring rotatable with respect to the axis of rotation, the radially inner ring comprises:
• a metal collar having a radially external cylindrical surface and a raceway in the radially extending cylindrical surface;
• a first sleeve having a radially external surface;
• and
• a second sleeve, the first and second sleeves are both made of reinforced polymeric material and are co-molded to the metal collar on axially opposite sides of the metal collar;
• a row of rolling bodies interposed between the radially outer ring and the radially inner ring;
• a sealing device arranged on an axial side with respect to the row of rolling bodies, the sealing device comprising a contacting lip in sliding contact with the radially external cylindrical surface of the metal collar;
• and
• a metal shield axially external with respect to the contacting lip, the metal shield being mounted by interference on the radially external surface of the first sleeve.

A bearing unit comprising:

• a radially outer ring stationary with respect to an axis of rotation;
• a radially inner ring rotatable with respect to the axis of rotation, the radially inner ring comprises:
• a metal collar having a raceway;
• a first sleeve;
• and
• a second sleeve having a hole arranged circumferentially on the second sleeve, the first and second sleeves are both made of reinforced polymeric material and are co-molded to the metal collar on axially opposite sides of the metal collar;
• a row of rolling bodies interposed between the radially outer ring and the radially inner ring;
• two sealing devices arranged on axially opposite sides with respect to the row of rolling bodies;
• and
• a clamping device configured to clamp the bearing unit to a machine shaft, the clamping device comprising a threaded bushing and a grub screw engaged with the threaded bushing, the threaded bushing disposed in the hole of the second sleeve.

A bearing unit comprising:

• a radially outer ring stationary with respect to an axis of rotation;
• a radially inner ring rotatable with respect to the axis of rotation, the radially inner ring comprises:
• a metal collar having a raceway, the metal collar having a plurality of teeth and a plurality of grooves arranged circumferentially on axial ends of the metal collar, the plurality of teeth alternating with the plurality of grooves;
• a first sleeve having an axial end facing the collar, the first sleeve comprising a plurality of teeth and a plurality of grooves arranged circumferentially in the axial end of the first sleeve, the plurality of teeth of the first sleeve alternating with the plurality of grooves of the first sleeve, the teeth of the metal collar engaged with corresponding grooves of the first sleeve and the grooves of the metal collar engaged with corresponding teeth of the first sleeve to inhibit rotation of the first sleeve and the metal collar relative to one another;
• and
• a second sleeve,
• the first and second sleeves are both made of reinforced polymeric material and are co-molded to the metal collar on axially opposite sides of the metal collar;
• a row of rolling bodies interposed between the radially outer ring and the radially inner ring;
• and
• two sealing devices arranged on axially opposite sides with respect to the row of rolling bodies.