Bearing unit with retaining cage
AssigneeAktibolaget SKF
InventorsRiccardo Restivo, Piero Santangelo, Gianpiero Scaltriti, Nils Manne
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Abstract
Bearing unit (30) has a central axis of rotation (X) and a retaining cage (40) for a plurality of rolling bodies (34) interposed between a radially outer ring (31) and a radially inner ring (33). The retaining cage (40) has a base rib (41), a plurality of tenons (42) that are spaced apart circumferentially and rigidly connected to the rib (41), and a plurality of pockets (43). Each pocket (43) is delimited by the rib (41) and by a respective pair of adjacent tenons (42). Each pocket (43) is defined by a respective radially outer spherical surface (44) and by at least one respective radially inner cylindrical surface (45) radially adjacent to the spherical surface (44).
Claims15
A bearing unit having a central rotation axis and comprising:
- a radially outer ring;
- a radially inner ring;
- a row of rolling bodies between the radially outer ring and the radially inner ring;
- and
- a retaining cage for retaining the rolling bodies, the retaining cage comprising:
- a rib;
- a plurality of circumferentially spaced tenons;
- and
- a plurality of pockets, each pocket being defined by a pair of tenons that are circumferentially adjacent, each pocket having:
- a spherical surface, radially external;
- and
- at least one cylindrical surface, radially internal and radially adjacent to the spherical surface;
- wherein the cylindrical surface is radially inside a circumference, traversed by a center of a rolling body during rotation of the bearing unit;
- wherein the diameter (A) of an annular boundary surface between the cylindrical surface and the spherical surface of the pocket is comprised between the diameter (P) of the circumference and the diameter (B) of the cylindrical surface, radially internal, of the rib by means of the relationship:
- B+(0.025×B)≤A≤P.
A bearing unit having a central rotation axis and comprising:
- a radially outer ring;
- a radially inner ring;
- a row of rolling bodies between the radially outer ring and the radially inner ring;
- and
- a retaining cage for retaining the rolling bodies, the retaining cage comprising:
- a rib;
- a plurality of circumferentially spaced tenons;
- and
- a plurality of pockets, each pocket being defined by a pair of tenons that are circumferentially adjacent, each pocket having:
- a spherical surface, radially external;
- and
- at least one cylindrical surface, radially internal and radially adjacent to the spherical surface;
- wherein the rib has alternate portions along the circumferential direction, with a first portion, having a first thickness, located in correspondence of a pair of tenons, and a second portion, having a second thickness, located in correspondence of the pockets and wherein the thickness of the first portion is between the second thickness and the distance between the center of the rolling body and an annular surface of the rib.
Dependencies are inferred from the claim text.