Bearing assemblies, apparatuses, and motor assemblies using the same
View Patent ↗Bearing assemblies, apparatuses, and motor assemblies using the same are disclosed. In an embodiment, a bearing assembly includes a plurality of superhard bearing elements distributed circumferentially about an axis. At least some of the superhard bearing elements may include a first end surface, a second end surface generally opposite the first end surface, a first side surface extending between the first end surface and the second end surface, a second side surface generally opposite the first side surface, and a bearing surface extending between the first end surface, the second end surface, the first side surface and the second side surface. Such superhard bearing elements may also include a ramped feature negatively sloping away from the bearing surface. The bearing assembly may further include a support ring that carries the plurality of superhard bearing elements.
1. A bearing assembly, comprising:
a support ring; and
a plurality of superhard bearing elements mounted to the support ring, the plurality of superhard bearing elements distributed circumferentially about an axis, at least some of the plurality of superhard bearing elements including:
a bearing surface; and
at least one substantially planar surface configured to direct lubricating fluid onto the bearing surface, the at least one substantially planar surface facing partially in a radial direction relative to the axis, partially in a circumferential direction of the support ring, and partially in an axial direction relative to the axis.
2. The bearing assembly of claim 1 wherein:
the at least some of the plurality of superhard bearing elements include:
a first end surface;
a second end surface spaced from and generally opposite to the first end surface;
a first side surface extending between the first end surface and the second end surface;
a second side surface generally opposite to the first side surface;
the bearing surface extends between the first end surface, the second end surface, the first side surface and the second side surface; and
at least one ramped feature having the at least one substantially planar surface defining a ramped surface sloping away from the bearing surface and toward the first end surface, the ramped surface further sloping toward one of the first side surface or the second side surface.
3. The bearing assembly of claim 2 wherein the ramped surface slopes away from the bearing surface at an angle of about 30 degrees to about 60 degrees relative to the bearing surface.
4. The bearing assembly of claim 2 wherein each of the first and second side surfaces is substantially planar.
5. The bearing assembly of claim 2 wherein the ramped surface extends between the first end surface, the first side surface, and an edge formed on the bearing surface.
6. The bearing assembly of claim 2 wherein at least one of the first end surface or the second end surface is arcuate.
7. The bearing assembly of claim 1 further comprising a plurality of converging channels defined between the at least some of the plurality of superhard bearing elements, each of the plurality of converging channels including the at least one substantially planar surface at least partially defining a banked surface that slopes with respect to the radial direction relative to the axis and the circumferential direction of the support ring.
8. The bearing assembly of claim 7 wherein the plurality of converging channels converge toward end surfaces of the at least some of the plurality of superhard bearing elements.
9. The bearing assembly of claim 1 wherein at least one of the plurality of superhard bearing elements exhibits a wedge shape.
10. The bearing assembly of claim 1 wherein at least one of the plurality of superhard bearing elements includes a substrate and a superhard table bonded to the substrate.
11. The bearing assembly of claim 10 wherein the superhard table includes a polycrystalline diamond.
12. The bearing assembly of claim 1 wherein the bearing surface of each of the at least some of the superhard bearing elements includes a convexly-curved bearing surface.
13. The bearing assembly of claim 1 wherein the bearing surface of each of the at least some of the superhard bearing elements includes a concavely-curved bearing surface.
14. The bearing assembly of claim 1 wherein the axis is a thrust axis, and wherein the support ring and the plurality of superhard bearing elements define a thrust-bearing assembly; or wherein the axis is a rotation axis, and wherein the support ring and the plurality of superhard bearing elements define a radial bearing assembly.
15. The bearing assembly of claim 1 wherein the at least one substantially flat surface slopes from the bearing surface towards the support ring.
16. A bearing apparatus, comprising:
a first bearing assembly including:
a first support ring; and
a first plurality of superhard bearing elements mounted to the first support ring, the first plurality of superhard bearing elements distributed circumferentially about an axis, at least some of the first plurality of superhard bearing elements including:
a first bearing surface; and
at least one substantially planar surface configured to direct lubricating fluid onto the first bearing surface, the at least one substantially planar surface facing partially in a radial direction relative to the axis, partially in a circumferential direction of the first support ring, and partially in an axial direction relative to the axis;
and
a second bearing assembly including:
a second support ring; and
a second plurality of superhard bearing elements mounted to the second support ring, the second plurality of superhard bearing elements generally opposed to the first plurality of superhard bearing elements of the first bearing assembly.
17. The bearing apparatus of claim 16 wherein the first bearing assembly is configured as a rotor and the second bearing assembly is configured as a stator.
18. The bearing apparatus of claim 16 wherein the at least one substantially flat surface slopes from the bearing surface towards the first support ring.
19. A motor assembly, comprising:
a motor operable to apply torque to a rotary drill bit, the motor operably coupled to a bearing apparatus, the bearing apparatus including a rotor and a stator; and
wherein at least one of the stator or the rotor includes:
a support ring; and
a plurality of superhard bearing elements mounted to the support ring, the plurality of superhard bearing elements distributed circumferentially about an axis, at least some of the plurality of superhard bearing elements including:
a bearing surface; and
at least one substantially planar surface configured to direct lubricating fluid onto the bearing surface, the at least one substantially planar surface facing partially in a radial direction relative to the axis, partially in a circumferential direction of the support ring, and partially in an axial direction relative to the axis.
20. The motor assembly of claim 19 wherein the at least one substantially flat surface slopes from the bearing surface towards the support ring.