Bearing assemblies including thick superhard tables and/or selected exposures, bearing apparatuses, and methods of use
Embodiments of the invention are directed to bearing assemblies configured to effectively provide heat dissipation for bearing elements, bearing apparatuses including such bearing assemblies, and methods of operating such bearing assemblies and apparatuses. In an embodiment, a bearing assembly includes a plurality of superhard bearing elements distributed about an axis. Each superhard bearing element of the plurality of superhard bearing elements has a superhard table including a superhard surface. The bearing assembly includes a support ring structure coupled to the plurality of superhard bearing elements. One or more of the superhard bearing elements includes a superhard table, which may improve heat transfer from such superhard bearing elements.
1. A bearing apparatus, comprising:
a first assembly including:
a plurality of bearing elements distributed about an axis, each of the plurality of bearing elements having a substrate bonded to a superhard table, the superhard table including a bearing surface and a peripheral surface extending between the bearing surface and an interface between the substrate and the superhard table, the superhard table exhibiting a thickness at the peripheral surface of at least 0.2 inch, the bearing; and
a support ring structure coupled to the plurality of superhard bearing elements such that a distance between the bearing surface of each of the plurality of bearing elements and a face of the support ring is approximately 0.9 times the thickness or greater.
2. The bearing apparatus of claim 1 , wherein the thickness is greater than about 0.3 inch.
3. The bearing apparatus of claim 1 , wherein the thickness is greater than about 0.4 inch.
4. The bearing apparatus of claim 1 , wherein the thickness is greater than about 0.5 inch.
5. The bearing apparatus of claim 1 , wherein the thickness is greater than about 0.75 inch.
6. The bearing apparatus of claim 1 , wherein the thickness is between about 0.25 inch and about 0.312 inch.
7. The bearing apparatus of claim 1 , wherein the thickness is between about 0.5 inch and 0.75 inch.
8. The bearing apparatus of claim 1 , wherein the distance is between about 0.18 inch and about 0.3 inch.
9. The bearing apparatus of claim 1 , wherein the distance is between about 0.25 inch and about 0.4 inch.
10. The bearing apparatus of claim 1 , wherein the distance is between about 0.3 inch and about 0.5 inch.
11. The bearing apparatus of claim 1 , wherein the thickness is approximately equal to the distance.
12. The bearing apparatus of claim 1 , wherein a ratio of an area of the bearing surface to an area of the peripheral surface is approximately 2:1 or more.
13. The bearing apparatus of claim 12 , wherein the ratio is approximately 4:1 or more.
14. The bearing apparatus of claim 1 , further comprising a second bearing assembly including:
a second plurality of bearing elements distributed about the axis, each of the second plurality of bearing elements having a substrate bonded to a superhard table, the superhard table including a bearing surface and at least one peripheral surface extending between the bearing surface and an interface between the substrate and the superhard table, the superhard table exhibiting a thickness at the peripheral surface of at least 0.2 inch; and
a second support ring structure coupled to the second plurality of superhard bearing elements.
15. The bearing apparatus of claim 14 , wherein a distance between the bearing surface of each of the plurality of bearing elements and a face of the second support ring approximately 0.9 times or greater the thickness of the peripheral surface of bearing elements of the second plurality of bearing elements.
16. The bearing apparatus of claim 14 , wherein the first and second bearing assemblies are configured as a thrust bearing apparatus.
17. The bearing apparatus of claim 14 , wherein the first and second bearing assemblies are configured as a radial bearing apparatus.
18. The bearing apparatus of claim 1 , wherein each of the plurality of bearing elements exhibit a substantially cylindrical geometry.
19. The bearing apparatus of claim 1 , wherein the superhard table comprises polycrystalline diamond.
20. The bearing apparatus of claim 19 , wherein the superhard table is leached to at least partially remove a metal-solvent catalyst therefrom.