Synchronized electromagnetic single plate clutch system

Patent metadata

Field	Value
Publication number	US-11480221-B2
Application number	US-202117449370-A
Country	US
Kind code	B2
Filing date	Sep 29, 2021
Priority date	Mar 9, 2020
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

An electromagnetic clutch assembly may include a first clutch plate, a second clutch plate, and a synchronizer. The second clutch plate may define an aperture. A portion of the synchronizer may be configured to extend through the aperture. In the absence of a magnetic field, the first clutch plate and the first surface of the second clutch plate may define an air gap and the portion of the synchronizer may extend into the air gap. In response to a first magnetic field, the portion of the synchronizer may contact the first clutch plate. In response to a second magnetic field, the portion of the synchronizer may translate in the aperture toward the second clutch plate and the first clutch plate and the second clutch plate may close the air gap.

First claim

What is claimed is:

1. A system, comprising:
a first clutch plate configured to rotate about a clutch axis;
a second clutch plate configured to rotate about the clutch axis, the second clutch plate defining at least one aperture extending substantially parallel to the clutch axis;
at least one synchronizer configured to extend through the at least one aperture toward the first clutch plate;
a spring configured to exert a spring force on the synchronizer in a direction toward the first clutch plate, wherein the spring is configured to compress in response to the synchronizer translating in the at least one aperture in the direction away from the first clutch plate;
an electromagnet configured to:
generate a first magnetic field as a first magnetic flux passing through the first clutch plate and the second clutch plate, wherein a first magnetic force of the first magnetic field is less than a spring force of the spring to close an air gap, and
generate a second magnetic field as a second magnetic flux passing through the first clutch plate and the second clutch plate, wherein a second magnetic force of the second magnetic field is greater than the spring force of the spring to close the air gap; and

processing circuitry configured to control a magnetic field generated by the electromagnet.

2. The system of claim 1 , wherein, in the absence of the magnetic field, the first clutch plate and the first surface of the second clutch plate define the air gap and the at least one synchronizer extends through the at least one aperture into the air gap.

3. The system of claim 1 , wherein, in response to the first magnetic field, the at least one synchronizer is configured to contact the first clutch plate.

4. The system of claim 1 , wherein, in response to the second magnetic field, the at least one synchronizer is configured to translate in the at least one aperture toward the second clutch plate, and the first clutch plate and the second clutch plate are configured to close the air gap.

5. The system of claim 1 , wherein the processing circuitry is configured to, based at least in part on a rotational speed of the first clutch plate, cause the electromagnet to generate the second magnetic field.

6. The system of claim 1 , wherein the electromagnet is wound around the clutch axis.

7. The system of claim 1 , wherein at least a portion of the first clutch plate is disposed between the electromagnet and the second clutch plate.

8. The system of claim 1 , further comprising an input shaft configured to rotate the first clutch plate.

9. The system of claim 7 , wherein a controller is configured to cause the electromagnet to generate the second magnetic flux based a rotational speed of the first clutch plate.

10. The system of claim 1 , wherein the at least one aperture comprises a plurality of apertures, wherein the at least one synchronizer comprises a plurality of synchronizers, each respective synchronizer configured to extend through a respective aperture of the plurality of apertures.

11. The system of claim 1 , wherein the synchronizer comprises an annular member configured to rotate about the clutch axis and at least one protrusion extending from the annular member substantially parallel to the clutch axis, and wherein the at least one protrusion extends from the second surface of the second clutch plate through the at least one aperture.

12. The system of claim 11 , wherein the second surface of the second clutch plate defines an annular recess radially offset from the clutch axis, and wherein the annular recess of the second clutch plate is shaped to receive the annular member of the synchronizer.

13. The system of claim 1 , wherein the first clutch plate and the second clutch plate are configured to cause the first magnetic flux and the second magnetic flux to flux weave between the first clutch plate and the second clutch plate.

14. The system of claim 1 , further comprising at least one rotational sensor that determines a rotational speed of at least one of the first clutch plate or the second clutch plate, and, based on the rotational speed determined by the at least one rotational sensor, the processing circuitry controls the electromagnet to generate the second magnetic field to cause the second clutch plate to contact the first clutch plate.

15. A system, comprising:
at least one input shaft;
at least one output shaft; and
an electromagnetic clutch assembly between the at least one input shaft and the at least one output shaft, wherein the electromagnetic clutch assembly comprises:
a first clutch plate coupled to the at least one input shaft, wherein the first clutch plate is configured to rotate about a clutch axis;
a second clutch plate coupled to the at least one output shaft, wherein the second clutch plate is configured to rotate about the clutch axis, the second clutch plate defining at least one aperture extending substantially parallel to the clutch axis;
at least one synchronizer configured to extend through the at least one aperture toward the first clutch plate;
a spring configured to exert a spring force on the synchronizer in a direction toward the first clutch plate, wherein the spring is configured to compress in response to the synchronizer translating in the at least one aperture in the direction away from the first clutch plate;
an electromagnet configured to:
generate a first magnetic field as a first magnetic flux passing through the first clutch plate and the second clutch plate, wherein a first magnetic force of the first magnetic field is less than a spring force of the spring to close the air gap, and
generate a second magnetic field as a second magnetic flux passing through the first clutch plate and the second clutch plate, wherein a second magnetic force of the second magnetic field is greater than a spring force of the spring to close the air gap; and

processing circuitry configured to control a magnetic field generated by the electromagnet.

16. The system of claim 15 , wherein the input shaft is coupled to a drive shaft of a gas turbine engine.

17. The system of claim 16 , wherein the output shaft is coupled to an accessory for the gas turbine engine, wherein the accessory is chosen from one or more fuel pumps, generators, constant speed drives, oil pumps, hydraulic pumps, compressors, engine starters, tachometer sensor drives, and auxiliary gearbox drives.

18. The system of claim 15 , further comprising at least one rotational sensor that determines a rotational speed of at least one of the first clutch plate or the second clutch plate, and, based on the rotational speed determined by the at least one rotational sensor, the processing circuitry controls the electromagnet to generate the second magnetic field to cause the second clutch plate to contact the first clutch plate.

Assignees

• Rolls Royce Corp

Inventors

• Klemen Donald

Classifications

• F16D2500/50239

  Soft clutch engagement · CPC title

• F16D27/06

  with friction surfaces arranged within the flux · CPC title

• F16D27/112 Primary

  with flat friction surfaces, e.g. discs · CPC title

• F16D27/115

  with more than two discs, e.g. multiple lamellae · CPC title

• F16D2027/007

  Bias of an armature of an electromagnetic clutch by flexing of substantially flat springs, e.g. leaf springs · CPC title