| CPC F16C 33/416 (2013.01) [F16C 33/3831 (2013.01)] | 19 Claims |
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1. A cage for a row of rolling bodies of a bearing unit, the cage comprising:
a rib made of a polymeric material, the rib comprising a plurality of spherical concave surfaces; and
a plurality of circumferentially spaced tenons made of a polymeric material and extending from a first axial side of the rib, each tenon of the plurality of tenons comprising a plurality of spherical concave surfaces; and
an armature comprising:
a plurality of first portions resting on a first plane;
a plurality of second portions resting on a second plane;
a plurality of through holes spaced circumferentially about the armature; and
a plurality of slots,
wherein each first portion of the plurality of first portions alternate circumferentially with each second portion of the plurality of second portions and define a circular crown,
wherein the spherical concave surfaces of the rib define with the spherical concave surfaces of the tenons a plurality of spherical cavities to hold each rolling body of the row of rolling bodies,
wherein a difference in axial position of the first portions and the second portions is between 0.1 mm and 25% of a diameter of the rolling bodies of the row of rolling bodies,
wherein the rib is overmolded around the armature, and
wherein each through hole of the plurality of through holes is evenly spaced circumferentially about the armature and positioned between a respective pair of slots of the plurality of slots on each side of a respective through hole, wherein a number of pairs of slots is equal to a number of through holes.
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6. A bearing unit comprising:
a radially outer ring,
a radially inner ring,
a row of rolling bodies interposed between the radially outer ring and the radially inner ring; and
a cage for the row rolling bodies, the cage comprising:
a rib made of a polymeric material, the rib comprising a plurality of spherical concave surfaces; and
a plurality of circumferentially spaced tenons made of a polymeric material and extending from a first axial side of the rib, each tenon of the plurality of tenons comprising:
a plurality of spherical concave surfaces; and
one or more tapered edges, wherein each of the one or more tapered edges comprises:
a radially outer surface comprising a diameter equal to a sum of a mean diameter of the bearing unit and 5% of a diameter of of the row of rolling bodies, wherein the diameter of the radially outer surface of the one or more tapered edges is measured as a diameter of a circle drawn through each radially outer surface of each of the one or more tapered edges of each of the circumferentially spaced tenons; and
an axial length that is less than a difference of an axial half-width of the radially outer ring and an axial width of a discharge edge of the radially outer ring, the discharge edge positioned between an axially outer surface of the radially outer ring and an axially outer surface of the cage; and
an armature comprising:
a plurality of first portions resting on a first plane; and
a plurality of second portions resting on a second plane,
wherein each first portion of the plurality of first portions alternate circumferentially with each second portion of the plurality of second portions and define a circular crown,
wherein the spherical concave surfaces of the rib define with the spherical concave surfaces of the tenons a plurality of spherical cavities to hold each rolling body of the row of rolling bodies.
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15. A cage for a row of rolling bodies of a bearing unit, the cage comprising:
a rib made of a polymeric material, the rib comprising a plurality of spherical concave surfaces; and
a plurality of circumferentially spaced tenons made of a polymeric material and extending from a first axial side of the rib, each tenon of the plurality of tenons comprising a plurality of spherical concave surfaces; and
an armature comprising:
a plurality of first portions resting on a first plane;
a plurality of second portions resting on a second plane;
a plurality of through holes spaced circumferentially about the armature; and
a plurality of slots,
wherein each first portion of the plurality of first portions alternate circumferentially with each second portion of the plurality of second portions and define a circular crown, and
wherein the spherical concave surfaces of the rib define with the spherical concave surfaces of the tenons a plurality of spherical cavities to hold each rolling body of the row of rolling bodies,
wherein a difference in axial position of the first portions and the second portions is between 0.1 mm and 25% of a diameter of the row of rolling bodies,
wherein the rib is overmolded around the armature, and
wherein each slot comprises a radial depth extending radially inward to a point that is more radially outward than a majority of each through hole.
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