Friction bearing and method for lubricating and cooling a friction bearing

Patent metadata

Field	Value
Publication number	US-12196261-B2
Application number	US-202217896202-A
Country	US
Kind code	B2
Filing date	Aug 26, 2022
Priority date	Aug 26, 2021
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A friction of a planetary gearbox, having first and second rotatably connected components. Oil adjacent an oil feed pocket of the first component is directed into a bearing clearance. The oil is directed into the pocket by a line that opens into the pocket. An oil supply unit supplies oil to the bearing clearance at a defined pressure. A ratio between the pulse, via which the oil is directed into the bearing clearance and which corresponds to the product of the square of the inflow rate of the oil into the clearance and the oil density, and the pulse of the oil which adheres to the internal side of the second component ≥5*10 −3 . The pulse of the oil adhering to the second component is equal to the product of the square of the velocity of the oil adhering to the second component and the oil density.

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,
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 .

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

3. 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.

4. The friction bearing according to claim 3 , 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.

5. The friction bearing according to claim 4 , 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°.

6. The friction bearing according to claim 4 , 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.

7. The friction bearing according to claim 6 , 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 fourth 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°.

8. The friction bearing according to claim 6 , wherein the first port or the first port and the fourth port is/are disposed in an axially center region of the friction bearing which extends across at most 25% of an axial bearing width of the friction bearing.

9. The friction bearing according to claim 6 , wherein at least one chosen from the first, second, third and fourth ports is embodied to be circular, elliptic or slot-shaped.

10. The friction bearing according to claim 6 , 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.

11. The friction bearing according to claim 6 , 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.

12. The friction bearing according to claim 4 , 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.

13. The friction bearing according to claim 4 , wherein a spacing between the first port and the third port in a 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.

14. The friction bearing according to claim 4 , 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.

15. The friction bearing according to claim 3 , wherein a spacing between the first port and the second port in a 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.

16. The friction bearing according to claim 1 , wherein the oil feed pocket and/or the first port is disposed in an axial extent of the friction bearing.

17. The friction bearing according to claim 1 , wherein the oil feed pocket and/or the first port is disposed off-center in an axial extent of the friction bearing to be axially eccentric in 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

• F16C32/0651

  Details of the bearing area per se · CPC title

• F16C2361/61

  Toothed gear systems, e.g. support of pinion shafts · CPC title

• F16C2360/23

  Gas turbine engines · CPC title

• F16C17/02

  for radial load only · CPC title