Rolling element device with jointly tiltable raceways

1. A gas turbine engine for an aircraft, comprising:

a core engine comprising a turbine, a compressor, and a core shaft connecting the turbine to the compressor;

a fan which is positioned upstream of the core engine, wherein the fan comprises a plurality of fan blades; and

a gear mechanism which is drivable by the core shaft,

wherein the fan is drivable by the gear mechanism at a lower speed than the core shaft,

wherein the gear mechanism comprises:

a roller element device, comprising:

an outer ring with an inner raceway,

an inner ring with an outer raceway, and

roller elements arranged between the inner and outer raceways so as to roll on the inner and outer raceways,

wherein the outer ring and the inner ring are each connected via a connecting portion to a respective fixing portion for fixing to one of two components that are rotatable relative to each other about a rotation axis, and

wherein the connecting portions are formed such that inner and outer raceways are jointly tiltable, at least in portions relative to the rotation axis;

wherein the connecting portions each have a stiffness, and the stiffnesses are matched to each other;

wherein the stiffnesses have a ratio relative to each other of 1.0+/−0.2.

2. The gas turbine engine according to claim 1 , wherein the two components that are rotatable relative to each other about the rotation axis are a stationary supporting structure and a component of the gas turbine engine which is rotatable relative thereto via the turbine, and the roller element device is configured for rotatable mounting of the rotatable component on the stationary supporting structure.

3. The gas turbine engine according to claim 1 , wherein the connecting portions are flexible.

4. The gas turbine engine according to claim 1 , wherein the connecting portions are deformed under effect of a force such that the two raceways at least in portions are tilted by a same angle relative to the rotation axis.

5. The gas turbine engine according to claim 1 , wherein the inner and outer raceways are oriented parallel to each other both in a state tilted relative to the rotation axis and in a non-tilted state.

6. The gas turbine engine according to claim 1 , wherein the inner and outer raceways are arranged overhanging relative to the respective fixing portions.

7. The gas turbine engine according to claim 1 , wherein the outer ring and the inner ring are axially spaced from the respective fixing portions by the respective connecting portions.

8. The gas turbine engine according to claim 1 , wherein the roller element device is a roller bearing.

9. The gas turbine engine according to claim 1 , wherein the roller element device is a cylindrical roller bearing.

10. The gas turbine engine according to claim 1 , wherein the gear mechanism is a planetary gear mechanism with a gear element mounted rotatably by the roller element device.

11. The gas turbine engine according to claim 1 , wherein:

the turbine is a first turbine, the compressor is a first compressor, and the core shaft is a first core shaft;

the core engine further comprises a second turbine, a second compressor, and a second core shaft which connects the second turbine to the second compressor; and

the second turbine, second compressor, and second core shaft are arranged to rotate at a higher speed than the first core shaft.

12. The gas turbine engine according to claim 1 , wherein the stiffnesses have a ratio relative to each other of 1.0+/−0.1.

13. The gas turbine engine according to claim 1 , wherein the stiffnesses have a ratio relative to each other of 1.0+/−0.05.