Planetary gear device and jet engine with a planetary gear device

Patent metadata

Field	Value
Publication number	US-9989122-B2
Application number	US-201615386796-A
Country	US
Kind code	B2
Filing date	Dec 21, 2016
Priority date	Dec 23, 2015
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A planetary gear device with at least one sun wheel, a ring gear and at least one planetary wheel that is in mesh with the sun wheel as well as with the ring gear, and that is mounted in a rotatable manner on a planetary carrier. A pressure angle (αph) between the tooth flanks of the teeth of the ring gear and of the planetary wheel, which are in mesh with each other during the main rotational direction of the planetary carrier, is larger than a pressure angle between the tooth flanks of the teeth of the planetary wheel and of the sun wheel, which are in mesh with each other at the same time. What is further proposed is a jet engine of an aircraft with such a planetary gear device.

First claim

The invention claimed is:

1. A planetary gear device comprising:
a sun wheel including teeth having tooth flanks,
a ring gear including teeth having tooth flanks, and
a planetary carrier,
a planetary wheel including teeth having tooth flanks, the planetary wheel meshing with the sun wheel and the ring gear and mounted in a rotatable manner on the planetary carrier,
wherein a pressure angle (αph) between the tooth flanks of the teeth of the ring gear and of the planetary wheel, which are in mesh with each other during a main rotational direction of the planetary carrier, is larger than a pressure angle (αps) between the tooth flanks of the teeth of the planetary wheel and of the sun wheel, which are also in mesh with each other during the main rotational direction of the planetary carrier.

2. The planetary gear device according to claim 1 , wherein the pressure angle (αph) between the tooth flanks of the teeth of the ring gear and of the planetary wheel is greater than or equal to 25°.

3. The planetary gear device according to claim 1 , wherein the pressure angle (αph) between the tooth flanks of the teeth of the ring gear and of the planetary wheel is greater than or equal to 30°.

4. The planetary gear device according to claim 1 , wherein the pressure angle (αph) between the tooth flanks of the teeth of the ring gear and of the planetary wheel is less than or equal to 60°.

5. The planetary gear device according to claim 1 , wherein the pressure angle (αps) between the tooth flanks of the teeth of the planetary wheel and of the sun wheel is greater than or equal to 10°.

6. The planetary gear device according to claim 1 , wherein the pressure angle (αps) between the tooth flanks of the teeth of the planetary wheel and of the sun wheel is less than or equal to 25°.

7. The planetary gear device according to claim 1 , wherein a profile overlap is smaller than 2 in a meshing area between the teeth of the planetary wheel and the teeth of the ring gear during the main rotational direction of the planetary carrier.

8. The planetary gear device according to claim 1 , wherein a profile overlap is greater than or equal to 2 in a meshing area between the teeth of the planetary wheel and the teeth of the sun wheel during the main rotational direction of the planetary carrier.

9. The planetary gear device according to claim 1 , wherein the planetary wheel is a double planet wheel.

10. The planetary gear device according to claim 1 , wherein one of the ring gear or the sun wheel is fixed at a housing of the planetary gear device.

11. The planetary gear device according to claim 1 , wherein the ring gear, the sun wheel and the planetary wheel have a straight-toothed configuration.

12. The planetary gear device according to claim 1 , wherein the ring gear, the sun wheel and the planetary wheel have a helically toothed configuration.

13. A jet engine comprising:
a fan,
a low-pressure shaft that is operatively connected with the fan,
wherein the operative connection between the fan and the low-pressure shaft comprises a planetary gear device according to claim 1 .

14. The jet engine according to claim 13 , wherein the fan is connected to one of the ring gear, the planetary carrier or the sun wheel, while the low-pressure shaft is operatively connected to another of the sun wheel, the planetary carrier or the ring gear.

15. The planetary gear device according to claim 1 , wherein the ring gear, the sun wheel and the planetary wheel have a double-helically toothed configuration.

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Venter Gideon Daniel
• Krueger David

Classifications

• F16H1/28 Primary

  with gears having orbital motion · CPC title

• F05D2260/40311

  of the epicyclical, planetary or differential type · CPC title

• F02C7/36

  Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user ({F02C3/107 - F02C3/13 and} F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H) · CPC title

• F16H57/08

  of gearings with members having orbital motion · CPC title

• F16H55/08

  Profiling · CPC title