Planetary gearbox having improved lubricant transfer, drive train, wind turbine and industrial application

Patent metadata

Field	Value
Publication number	US-12044306-B2
Application number	US-202118021337-A
Country	US
Kind code	B2
Filing date	Aug 12, 2021
Priority date	Aug 24, 2020
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A planetary gearbox includes a first planetary stage with a component, a sun gear, and a planet gear meshing with the sun gear via a toothing system, a second planetary stage, and a lubricant transfer device arranged between the first planetary stage and the second planetary stage. The lubricant transfer device includes a discharge component arranged in a co-rotating manner on a component of the second planetary stage, and a receiving component designed to receive lubricant and arranged in a co-rotating manner on the component of the first planetary stage. A lubricant conduit communicates with the lubricant transfer device and is configured to extend over an entire axial extent of a tooth engagement region of the sun gear of the first planetary stage radially within the toothing system of the sun gear with the planet gear of the first planetary stage.

First claim

What is claimed is:

1. A planetary gearbox, comprising:
a first planetary stage comprising a first component, a sun gear, and a planet gear meshing with the sun gear via a toothing system;
a second planetary stage comprising a second component;
a lubricant transfer device arranged between the first planetary stage and the second planetary stage, said lubricant transfer device comprising a discharge component arranged in a co-rotating manner on the second component of the second planetary stage, and a receiving component designed to receive lubricant and arranged in a co-rotating manner on the first component of the first planetary stage; and
a lubricant conduit configured to extend over an entire axial extent of a tooth engagement region of the sun gear of the first planetary stage radially within the toothing system of the sun gear with the planet gear of the first planetary stage.

2. The planetary gearbox of claim 1 , wherein the lubricant conduit is deflected in a flow direction of the lubricant within the lubricant transfer device between an axial flow direction and a radial flow direction.

3. The planetary gearbox of claim 2 , wherein the lubricant conduit leads into the discharge component of the lubricant transfer device in the axial direction and exits the receiving component of the lubricant transfer device in the radial direction.

4. The planetary gearbox of claim 1 , wherein the second planetary stage comprises a planet carrier including a hub, said sun gear connected to the hub of the planet carrier of the second planetary stage for rotation in relation to the hub or in rotationally fixed manner on the hub, said lubricant conduit designed to pass within the hub through the tooth engagement region of the sun gear, said lubricant transfer device positioned downstream of the hub.

5. The planetary gearbox of claim 1 , wherein the first component of the first planetary stage comprises a planet carrier, the first planetary stage comprising and a planet gear pin which is inserted in a rotatable or rotationally fixed manner in the planet carrier of the first planetary stage, and wherein the second component of the second planetary stage comprises a planet carrier, the second planetary stage comprising and a planet gear pin which is inserted in a rotatable or rotationally fixed manner in the planet carrier of the second planetary stage, said lubricant conduit routed to both the planet gear pin of the first planetary stage and the planet gear pin of the second planetary stage.

6. The planetary gearbox of claim 5 , wherein the lubricant conduit terminates at the planet gear pin of the first planetary stage at an axial distance from a planet gear provided on the planet gear pin of the first planetary stage and/or the lubricant conduit terminates at the planet gear pin of the second planetary stage at an axial distance from a planet gear provided on the planet gear pin of the second planetary stage.

7. The planetary gearbox of claim 1 , wherein the first planetary stage comprises a planet carrier including a web which faces away from the second planetary stage, said receiving component arranged on the web of the planet carrier of the first planetary stage.

8. The planetary gearbox of claim 1 , wherein the lubricant transfer device is configured to compensate for a radial, an axial offset and/or angular offset between the discharge component and the receiving component.

9. The planetary gearbox of claim 1 , wherein the lubricant transfer device comprises a labyrinth seal, a bushing and/or a sealing ring.

10. The planetary gearbox of claim 1 , wherein the discharge component and the receiving component are arranged such as to form a gap there between.

11. The planetary gearbox of claim 1 , further comprising a third planetary stage.

12. A drive train for a wind turbine, said drive train comprising:
a planetary gearbox comprising a first planetary stage comprising a first component, a sun gear, and a planet gear meshing with the sun gear via a toothing system, a second planetary stage comprising a second component, a lubricant transfer device arranged between the first planetary stage and the second planetary stage, said lubricant transfer device comprising a discharge component arranged in a co-rotating manner on the component of the second planetary stage, and a receiving component designed to receive lubricant and arranged in a co-rotating manner on the component of the first planetary stage, and a lubricant conduit configured to extend over an entire axial extent of a tooth engagement region of the sun gear of the first planetary stage radially within the toothing system of the sun gear with the planet gear of the first planetary stage;
a rotor shaft connected in a torque-transmitting manner to the planetary gearbox; and
a generator connected in a torque-transmitting manner to the planetary gearbox.

13. A wind turbine, comprising:
a nacelle;
a drive train designed in a form as set forth in claim 12 ; and
a multi-blade rotor connected in a torque-transmitting manner to the drive train and rotatably arranged on the nacelle.

14. An industrial application, comprising:
a drive unit;
an output unit; and
a gearbox configured to connect the drive unit and the output unit in a torque-transmitting manner to one another, said gearbox designed in a form of a planetary gearbox as set forth in claim 1 .

15. A computer program product embodied on a non-transitory computer readable medium comprising commands which, when executed by a computer, cause the computer to simulate an operating behavior of a planetary gearbox which is arranged in a drive train of a wind turbine and configured as set forth in claim 1 .

Assignees

• Flender Gmbh

Inventors

• Hessling Pascal
• Vennemann Michael

Classifications

• F03D80/707

  Gearing lubrication, e.g. gear boxes · CPC title

• F16H2057/02078

  for wind turbines · CPC title

• F16H57/0479

  Gears or bearings on planet carriers · CPC title

• F16H57/0472

  Seals · CPC title

• F16H57/043 Primary

  within rotary parts, e.g. axial channels or radial openings in shafts · CPC title