Friction bearing, and method for lubricating and cooling a friction bearing

Patent metadata

Field	Value
Publication number	US-12188519-B2
Application number	US-202217896214-A
Country	US
Kind code	B2
Filing date	Aug 26, 2022
Priority date	Aug 26, 2021
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A friction bearing of a planetary gearbox, has first and second rotatably connected components. Oil adjacent an oil feed pocket of the first component is directed into the bearing clearance between the components. The oil is directed into the pocket by a first line that opens into the pocket. The profile of the line conjointly with the radial direction of the bearing clearance encloses an angle to direct the oil from the line into the oil feed pocket, the angle being approximately 5°-60° to the radial direction of the bearing clearance and in the main rotation direction of the second component in relation to the first component, or at an angle of approximately 5°-20° to the radial direction of the bearing clearance and in the circumferential direction of the bearing clearance and counter to the main rotation direction of the second component to the first component.

First claim

The invention claimed is:

1. A friction bearing of a planetary gearbox, comprising:
a rotationally fixed first component and a second component rotatably connected thereto,
an oil feed pocket positioned on the first component and configured to direct oil into a bearing clearance between the first and second components,
a first port connected to a first line opening into the oil feed pocket, and configured for directing the oil into the oil feed pocket,
wherein the first line is oriented such that the oil is directed from the first line into the oil feed pocket at an angle of approximately 5° to 60° in relation to a radial direction of the bearing clearance and in a rotation direction of the second component in relation to the first component.

2. The friction bearing according to claim 1 , and further comprising an oil supply unit by which the oil is fed to the bearing clearance at a defined pressure, wherein the oil supply unit and a flow cross section of the first line is specified so that a ratio between a first factor being a product of a square of a velocity of the oil from the first line being directed into the bearing clearance and a density of the oil, and a second factor being a product of a square of a velocity of the oil adhering to the second component and the density of the oil, wherein the ratio is at least 5×10 −3 .

3. The friction bearing according to claim 1 , wherein the first line has an expanding width in the circumferential direction of the bearing clearance.

4. The friction bearing according to claim 1 , and further comprising a second port connected to a second line opening into the oil feed pocket, and configured for directing the oil into the oil feed pocket, the second port trailing the first port in a rotation direction of the second component and spaced apart from the first port in an axial direction of the friction bearing.

5. The friction bearing according to claim 4 , wherein the oil feed pocket and/or the first port is disposed in an axial extent of the friction bearing to be in an axial center of the friction bearing.

6. The friction bearing according to claim 4 , wherein the oil feed pocket and/or the first port is disposed off-center in an axial extent of the friction bearing.

7. The friction bearing according to claim 4 , and further comprising a third port connected to a third line opening into the oil feed pocket, and configured for directing the oil into the oil feed pocket, the third port in a circumferential direction having a same spacing from the first port as the second port has from the first port in the circumferential direction, and in an axial direction, the third port is spaced apart from the first port and the second port with the first port being positioned between the second port and the third port in the axial direction.

8. The friction bearing according to claim 7 , wherein axial spacings between the first, second and third ports and spacings between the first, second and third ports in the circumferential direction of the bearing clearance and in the rotation direction of the second component in relation to the first component are arranged so that the second port and the third port are disposed within a sector, the sector originating at the first port, extending in the rotation direction of the second component, and enclosing an angle of approximately 120°.

9. The friction bearing according to claim 7 , and further comprising a fourth port connected to a fourth line opening into the oil feed pocket, the fourth port being spaced apart from the first port in the axial direction, in the circumferential direction of the bearing clearance and in the rotation direction of the second component in relation to the first component, wherein the first port and the fourth port in the axial direction of the friction bearing are disposed between the second port and the third port.

10. The friction bearing according to claim 9 , wherein axial spacings between the first, second, third and fourth ports as well as spacings between the first, second, third and fourth ports in the circumferential direction of the bearing clearance and in the rotation direction of the second component in relation to the first component are arranged so that the second and third ports trail the first and third ports and are disposed within a sector, the sector originating between the first port and the fourth port, extending in the rotation direction of the second component, and enclosing an angle of approximately 120°.

11. The friction bearing according to claim 9 , wherein the first port or the first port and the fourth port is/are disposed in an axial region of the friction bearing which extends across at most 25% of an axial bearing width of the friction bearing.

12. The friction bearing according to claim 9 , wherein at least one chosen from the first, second, third and fourth ports is embodied to be circular, elliptic or slot-shaped.

13. The friction bearing according to claim 9 , wherein a size of an opening cross section of the first port, and/or a size of an opening cross section of the fourth port deviates from a size of an opening cross section of the second port and/or from a size of an opening cross section of the third port.

14. The friction bearing according to claim 9 , wherein the first line and/or the fourth line are/is impinged by oil from a first oil circuit, and the second line and/or the third line are/is impinged by oil from a second oil circuit.

15. The friction bearing according to claim 7 , wherein the second port and the third port are disposed in an axially center region of the friction bearing which extends across at most 50% of the axial bearing width of the friction bearing.

16. The friction bearing according to claim 7 , wherein a spacing between the first port and the third port in the circumferential direction and in the rotation direction of the second component corresponds to at most four times a diameter of an opening cross section of the first port, or to at most 10% of an entire bearing circumference of the friction bearing.

17. The friction bearing according to claim 7 , wherein axial spacings between the first port and the second port, as well as between the first port and the third port, each correspond to at most four times a diameter of an opening cross section of the first port.

18. The friction bearing according to claim 4 , wherein a spacing between the first port and the second port in the circumferential direction and in the rotation direction of the second component corresponds to at most four times a diameter of an opening cross section of the first port, or to at most 10% of an entire bearing circumference of the friction bearing.

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• UHKÖTTER Stephan
• Kracht Uwe
• Kurz-Hardjosoekatmo Wolfram
• Douma Rens
• Martin Ivo

Classifications

• F16C33/101

  Details of the bearing surface, e.g. means to generate pressure such as lobes or wedges · CPC title

• F16C33/1055

  from radial inside, e.g. via a passage through the shaft and/or inner sleeve · CPC title

• F02C7/06

  Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M) · CPC title

• F05D2260/98

  Lubrication · CPC title

• F05D2260/205

  Cooling fluid recirculation, i.e. after cooling one or more components is the cooling fluid recovered and used elsewhere for other purposes · CPC title