Patent ID: 11898603
Assignee: AKTIEBOLAGET SKF
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A bearing unit comprising:
at least one row of rolling bodies; and at least one cage for retaining the rolling bodies; wherein the at least one cage comprises:
a base rib comprising partially spherical concave surfaces;
a plurality of fingers spaced circumferentially and extending at least from one side of the base rib, said fingers also comprising partially spherical concave surfaces;
a plurality of partially spherical cavities for holding the rolling bodies, each cavity being defined by the partially spherical concave surfaces of a pair of fingers of the plurality of fingers and of the base rib;
a radially outer second rib and each cavity of the plurality of cavities is defined by the partially spherical concave surfaces of a pair of fingers of the plurality of fingers, of the base rib and of the second rib;
wherein the rolling bodies and the cages are in contact with each other via a plurality of protrusions formed on the partially spherical concave surfaces of the fingers and of the base rib,
wherein the plurality of protrusions comprises:
at least one lateral protrusion formed along the surface of each finger of the plurality of fingers of the cage; and
a radially inner central protrusion, centered on the internal lateral surface of the radially inner base rib and a radially outer central protrusion, centered on the internal lateral surface of the second rib.