Conrad bearing cage
The present invention provides a method and apparatus for retaining bearing balls in a bearing assembly. For example, a cage assembly may comprise an annular cage having a plurality of pockets in which to snap-in bearing balls via openings having a width less than the diameter of the bearing balls. A retainer ring for the cage may have an inner diameter that is equal to the inner diameter of the cage. The cage assembly may comprise a plurality of cage webs, wherein each cage web is located between two adjacent pockets, and each cage web may be tapered (either radially, axially, or both radially and axially). The plurality of cage webs may be tapered such that the cage webs are tapered towards a distal end of each cage web and away from a proximal end of each cage web. An outer land may pilot the bearing assembly.
1. A bearing assembly, comprising:
a plurality of bearing balls;
a cage, including a plurality of pockets, a plurality of cage webs, an outer surface, a relief radius, a pilot radius, and a center, the plurality of pockets including the bearing balls disposed therein, the plurality of cage webs each located between an adjacent pair of the pockets, the outer surface comprising a relief surface and a pilot surface, the relief radius measured radially from the center to the relief surface, and the pilot radius measured radially from the center to the pilot surface, the pilot radius being greater than the relief radius; and
a retaining ring affixed to the cage, wherein an inner diameter of the cage is equal to an inner diameter of the retaining ring.
2. The bearing assembly of claim 1 , further comprising an outer raceway concentric with the cage and radially outward from the cage, wherein a cage pilot clearance is located between the outer raceway and the cage.
3. The bearing assembly of claim 2 , further comprising an inner raceway concentric with the cage and radially inward from the cage, wherein a cage non-pilot clearance is located between the inner raceway and the cage.
4. The bearing assembly of claim 3 , further comprising an inner raceway chamfer.
5. The bearing assembly of claim 3 , wherein the cage non-pilot clearance is greater than the cage pilot clearance.
6. A bearing assembly, comprising:
a plurality of bearing balls;
a cage, including a plurality of pockets, a plurality of cage webs, an outer surface, a relief radius, a pilot radius, and a center, the plurality of pockets including the bearing balls disposed therein, the plurality of cage webs each located between an adjacent pair of the pockets, the outer surface comprising a relief surface and a pilot surface, the relief radius measured radially from the center to the relief surface, and the pilot radius measured radially from the center to the pilot surface, the pilot radius being greater than the relief radius;
an inner raceway concentric with the cage;
an outer raceway concentric with the cage and the inner raceway; and
a retaining ring concentric with the cage, the inner raceway, and the outer raceway, the retaining ring having an inner diameter that is equal to an inner diameter of the cage;
wherein a cage pilot clearance is located between the outer raceway and the cage; wherein a cage non-pilot clearance is located between the inner raceway and the cage; and wherein the cage non-pilot clearance is greater than the cage pilot clearance.
7. The bearing assembly of claim 6 , wherein the cage non-pilot clearance is about 2.3 times the size of the cage pilot clearance.
8. The bearing assembly of claim 6 , wherein the cage non-pilot clearance is about 0.032 inch (0.089 centimeter) and the cage pilot clearance is about 0.012 inch (0.038 centimeter).
9. A gas turbine engine, comprising:
a shaft; and
a rolling element bearing coupled to the shaft;
the rolling element bearing comprising:
a plurality of bearing balls;
a cage, including a plurality of pockets, a plurality of cage webs, an outer surface, a relief radius, a pilot radius, and a center, the plurality of pockets including the bearing balls disposed therein, the plurality of cage webs each located between an adjacent pair of the pockets, the outer surface comprising a relief surface and a pilot surface, the relief radius measured radially from the center to the relief surface, and the pilot radius measured radially from the center to the pilot surface, the pilot radius being greater than the relief radius; and
a retaining ring coupled to the cage having an inner diameter that is equal to an inner diameter of the cage.
10. A bearing assembly, comprising:
a plurality of bearing balls;
a cage including a plurality of pockets, a plurality of cage webs, an outer surface, a relief radius, a pilot radius, and a center, the plurality of pockets including the bearing balls disposed therein, the plurality of cage webs each located between an adjacent pair of the pockets, the outer surface comprising a relief surface and a pilot surface, the relief radius measured radially from the center to the relief surface, and the pilot radius measured radially from the center to the pilot surface, the pilot radius being greater than the relief radius;
an inner raceway concentric with the cage and radially inward from the cage;
an outer raceway concentric with the cage and radially outward from the cage; and
a retaining ring affixed to the cage, wherein an inner diameter of the retaining ring is equal to an inner diameter of the cage.
11. The bearing assembly of claim 10 , wherein a distance between an adjacent pair of the cage webs is less than a diameter of said bearing ball located between the adjacent pair of the cage webs.
12. The bearing assembly of claim 10 , wherein each adjacent pair of the cage webs has a gap therebetween, the gap leading to a corresponding one of the plurality of pockets.