Turbine engine stack nut with integrated phonic wheel

1. An assembly for a turbine engine, comprising:

a rotating assembly configured to rotate about an axis, the rotating assembly including an engine shaft and a stack nut threaded onto the engine shaft, and the stack nut comprising a castellated periphery; and

a sensor configured to measure fluctuations in a magnetic field induced by the castellated periphery during rotation of the rotating assembly about the axis.

2. The assembly of claim 1 , wherein a tip of the sensor is disposed radially outboard of and adjacent the castellated periphery.

3. The assembly of claim 1 , further comprising:

a sensor system comprising the castellated periphery and the sensor;

the sensor system configured to determine a rotational velocity of the rotating assembly.

4. The assembly of claim 1 , wherein

a phonic wheel is integrated into the stack nut; and

the phonic wheel comprises the castellated periphery.

5. The assembly of claim 1 , wherein

the castellated periphery comprises a plurality of indentations arranged circumferentially about the axis; and

each of the plurality of indentations projects radially and axially into the stack nut.

6. The assembly of claim 5 , wherein a first of the plurality of indentations has a polygonal sectional geometry.

7. The assembly of claim 5 , wherein

each of the plurality of indentations has a lateral width; and

each circumferentially neighboring pair of the plurality of indentations are spaced apart by a lateral distance that is different than the lateral width.

8. The assembly of claim 1 , wherein

the castellated periphery comprises a plurality of teeth arranged circumferentially about the axis; and

each of the plurality of teeth projects radially out to a respective distal end.

9. The assembly of claim 1 , further comprising:

a rolling element bearing comprising an inner race mounted on the engine shaft;

the stack nut configured to secure the inner race to the rotating assembly.

10. The assembly of claim 9 , wherein the stack nut axially engages the inner race.

11. The assembly of claim 9 , wherein

the rotating assembly further includes a seal land mounted on the engine shaft; and

the inner race is axially stacked between the stack nut and the seal land.

12. The assembly of claim 1 , wherein the stack nut further comprises a lubricant scoop.

13. The assembly of claim 1 , wherein the stack nut further comprises

a gutter projecting radially in an outward direction into the stack nut, the gutter extending axially within the stack nut, and the gutter extending circumferentially about the axis within the stack nut; and

a plurality of passages arranged circumferentially about the axis, each of the plurality of passages fluidly coupled with the gutter and extending axially through the stack nut.

14. The assembly of claim 13 , wherein the stack nut further comprises

a channel projecting axially into the stack nut, the channel extending radially within the stack nut, and the channel extending circumferentially about the axis within the stack nut;

each of the plurality of passages extending axially through the stack nut from the gutter to the channel.

15. The assembly of claim 1 , wherein the rotating assembly further includes a retainer rotationally securing the stack nut to the engine shaft.

16. The assembly of claim 1 , wherein the rotating assembly further comprises a bladed rotor connected to the engine shaft.

17. An assembly for a turbine engine, comprising:

a rotating assembly configured to rotate about an axis, the rotating assembly comprising an engine shaft, an engine component and a monolithic stack nut;

the engine component mounted onto the engine shaft; and

the monolithic stack nut threaded onto the engine shaft, the monolithic stack nut axially engaging the engine component, and the monolithic stack nut comprising a phonic wheel.

18. The assembly of claim 17 , wherein the engine component comprises a bearing.

19. The assembly of claim 17 , further comprising a sensor configured to measure fluctuations in a magnetic field induced by the phonic wheel during rotation of the rotating assembly about the axis.