High speed bearing assembly

Patent metadata

Field	Value
Publication number	US-9822817-B2
Application number	US-201615076119-A
Country	US
Kind code	B2
Filing date	Mar 21, 2016
Priority date	Apr 28, 2015
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A bearing assembly includes an outer race, a cage, a plurality of internal rotating members, and an inner race. Lubricant flows through the bearing assembly to withdraw heat generated during operation of the bearing assembly.

First claim

What is claimed is:

1. A bearing assembly comprising
an inner race that extends around a central axis,
an outer race that extends around the central axis radially outward of the inner race,
a plurality of internal rotating components arranged radially between the inner race and the outer race to engage the inner race and the outer race, and
a cage that extends around the central axis radially between the inner race and the outer race, the cage including a cage rail formed to include a plurality of apertures that receive the plurality of internal rotating components to locate the plurality of internal rotating components relative to one another within the bearing assembly and a plurality of lubricant-ejector fins that extend radially outward from the cage rail that are shaped to push lubricant between the cage rail and the outer race out of the bearing assembly during rotation of the cage relative to the outer race in a direction of rotation so that hot lubricant is removed from the bearing assembly to make room for cooler lubricant introduced into the bearing assembly during rotation of the cage.

2. The bearing assembly of claim 1 , wherein the plurality of lubricant-ejector fins include forward-side fins arranged along an axially-forward side of the cage and aft-side fins arranged along an axially-aft side of the cage.

3. The bearing assembly of claim 2 , wherein each of the lubricant-ejector fins has a curved shape when viewed inwardly in a radial direction toward the central axis.

4. The bearing assembly of claim 2 , wherein the plurality of lubricant-ejector fins are spaced axially apart from the plurality of apertures formed in the cage rail of the cage.

5. The bearing assembly of claim 1 , wherein each of the plurality of lubricant-ejector fins has a leading edge and a trailing edge, and the leading edge arranged to engage lubricant present between the cage and the outer race ahead of the trailing edge during rotation of the cage relative to the outer race in the direction of rotation.

6. The bearing assembly of claim 5 , wherein the trailing edge of each of the lubricant-ejector fins is adjacent to an axially-forward side or an axially-aft side of the cage and the leading edge of each of the lubricant-ejector fins is spaced axially from the trailing edge and circumferentially from the trailing edge in the direction of rotation.

7. The bearing assembly of claim 6 , wherein the plurality of lubricant-ejector fins include forward-side fins arranged along an axially-forward side of the cage and aft-side fins arranged along an axially-aft side of the cage.

8. The bearing assembly of claim 6 , wherein each of the lubricant-ejector fins has a curved shape between the leading edge and the trailing edge when viewed inwardly in a radial direction toward the central axis.

9. The bearing assembly of claim 1 , wherein the inner race includes a forward ring and an aft ring that cooperate to form a bearing surface engaged by the internal rotating components and to form a channel that extends radially through the inner race to provide a path for lubricant to enter the bearing assembly.

10. The bearing assembly of claim 1 , wherein the internal rotating components are balls or rollers.

11. A bearing assembly comprising
an inner race,
an outer race,
a plurality of internal rotating components arranged radially between the inner race and the outer race to engage the inner race and the outer race, and
a cage located radially between the inner race and the outer race, the cage including a cage rail that engages the plurality of internal rotating components and a plurality of lubricant-ejector fins that extend from the cage rail,
wherein the lubricant-ejector fins each have a leading edge and a trailing edge, the leading edge is arranged to engage lubricant present between the cage and the outer race ahead of the trailing edge during rotation of the cage relative to the outer race in a direction of rotation, and the trailing edge spaced apart from the leading edge in an axial direction toward the nearer of an axially-forward side or an axially-aft side of the cage,
wherein each of the lubricant-ejector fins has a curved shape between the leading edge and the trailing edge when viewed inwardly in a radial direction toward the central axis.

12. The bearing assembly of claim 11 , wherein the plurality of lubricant-ejector fins include forward-side fins arranged along an axially-forward side of the cage and aft-side fins arranged along an axially-aft side of the cage.

13. The bearing assembly of claim 11 , wherein the inner race includes a forward ring and an aft ring arranged axially adjacent to the forward ring so that the forward ring and the aft ring cooperate to form a bearing surface engaged by the internal rotating components and a channel that extends radially through the inner race to provide a path for lubricant to enter the bearing assembly.

14. A bearing assembly comprising
an inner race,
an outer race,
a plurality of internal rotating components arranged radially between the inner race and the outer race to engage the inner race and the outer race, and
a cage located radially between the inner race and the outer race, the cage including a cage rail and a plurality of lubricant-ejector fins that extend from the cage rail, the lubricant-ejector fins shaped to push lubricant out of the bearing assembly, each of the plurality of lubricant-ejector fins has a leading edge and a trailing edge, and the leading edge arranged to engage lubricant present between the cage and the outer race ahead of the trailing edge during rotation of the cage relative to the outer race in the direction of rotation, the trailing edge of each of the lubricant-ejector fins is adjacent to an axially-forward side or an axial-aft side of the cage and the leading edge of each of the lubricant-ejector fins is spaced axially from the trailing edge and circumferentially from the trailing edge in the direction of rotation,
wherein each of the lubricant-ejector fins has a curved shape between the leading edge and the trailing edge when viewed inwardly in a radial direction toward the central axis.

15. The bearing assembly of claim 14 , wherein the plurality of lubricant-ejector fins include forward-side fins arranged along the axially-forward side of the cage and aft-side fins arranged along the axially-aft side of the cage.

16. The bearing assembly of claim 14 , wherein the cage rail is formed to include a plurality of apertures that receive the plurality of internal rotating components and the plurality of lubricant-ejector fins are spaced axially apart from the plurality of apertures formed in the cage rail of the cage.

Assignees

• Rolls Royce Corp
• Rolls Royce Nam Tech Inc
• Rolls Royce Nam Tech Inc

Inventors

• Price Craig M
• Copeland Andrew D

Classifications

• F16C19/06

  with a single row or balls · CPC title

• F16C37/007

  of rolling bearings · CPC title

• F16C33/467

  Details of individual pockets, e.g. shape or roller retaining means · CPC title

• F16C33/3887

  Details of individual pockets, e.g. shape or ball retaining means · CPC title

• F16C33/4623

  formed as one-piece cages, i.e. monoblock cages · CPC title