Thermally Isolated Composite Exciter Ring

• US 20190309810A1
• Filed: 04/10/2018
• Published: 10/10/2019
• Est. Priority Date: 04/10/2018
• Status: Active Grant

• Current Assignee: Branch Outlets, LLC, Bendix Spicer Foundation Brake LLC (Estate of Heinz Hermann Thiele)
• Original Assignee: Bendix Spicer Foundation Brake LLC (Estate of Heinz Hermann Thiele)
• Inventors: SABETI, Manouchehr, HANTAK, Kevin D., SEAMAN, James A.
• Granted Patent: US 10,837,510 B2
• Time in Patent Office: Days
• CPC Class Codes: B60T 8/1761 responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
• CPC Class Codes: B60T 8/329 Systems characterised by their speed sensor arrangements
• CPC Class Codes: F16C 41/007 Encoders, e.g. parts with a plurality of alternating magnetic poles
• CPC Class Codes: F16D 2065/132 layered
• CPC Class Codes: F16D 2066/003 Position, angle or speed
• CPC Class Codes: F16D 2200/0043 Ceramic base, e.g. metal oxides or ceramic binder
• CPC Class Codes: F16D 2200/0047 Ceramic composite, e.g. C/C composite infiltrated with Si or B, or ceramic matrix infiltrated with metal
• CPC Class Codes: F16D 65/127 characterised by properties of the disc surface; Discs lined with friction material
• CPC Class Codes: G01P 3/443 mounted in bearings bearings F16C
• CPC Class Codes: G01P 3/487 delivered by rotating magnets

Abstract

A composite exciter ring for use in a vehicle brake system includes a base layer and a cover layer that is disposed on the base layer. The base layer is made of a ceramic material that insulates the cover layer from a heat source generated during brake activation. The cover layer is made of a plastic material and that defines openings. Each opening exposes a different part of the base layer. The ceramic material includes an additive infused therein. The additive has an effect on a magnetic field.

Claims

1. A composite exciter ring for use in a vehicle brake system, comprising:

a base layer; and

a cover layer that is disposed on the base layer, wherein

the base layer is made of a material that insulates the cover layer from a heat source generated during brake activation,

the cover layer is made of a material and that defines openings, each opening exposing a different part of the base layer, wherein

the material includes an additive infused therein, the additive having an effect on a magnetic field.

2. The composite exciter ring according to claim 1, wherein the base layer is made of a ceramic material.

3. The composite exciter ring according to claim 2, wherein the cover layer is made of a plastic material.

4. The composite exciter ring according to claim 3, wherein the additive is a magnetically permeable material having low magnetic retentivity.

5. The composite exciter ring according to claim 4, wherein the additive is infused only in the exposed different parts of the base layer, such that the rest of the base layer is substantially devoid of the additive.

6. The composite exciter ring according to claim 5, wherein an amount of the additive infused to the ceramic material corresponds to a minimum amount needed to alter the magnetic field.

7. The composite exciter ring according to claim 6, wherein the additive is ferritic.

8. The composite exciter ring according to claim 7, wherein the base layer and the cover layer are substantially ring shaped.

9. The composite exciter ring according to claim 8, wherein the cover layer is disposed radially inward relative to the base layer, such that a region of the base layer that is radially outward relative to the cover layer is fully exposed.

10. The composite exciter ring according to claim 9, wherein the base layer defines therein openings configured to receive a fastener that couples the composite exciter ring to another brake component.

11. An air brake system for a vehicle comprising:

a rotating member configured to rotate in response to a motion of the vehicle;

the composite exciter ring according to claim 3, wherein

the composite exciter ring is coupled to the rotating member and the base layer is in contact with the rotating member; and

a sensor configured to respond to a change in its magnetic field when in proximity to the rotating base layer.

12. The air brake system according to claim 11, wherein the rotating member is one of a brake rotor, a drum, and a wheel hub.

13. A composite exciter ring for use in a vehicle brake system, comprising:

a base layer;

a middle layer disposed on the base layer; and

a cover layer disposed on the middle layer, wherein

the base layer is made of a material that insulates the middle layer and the cover layer from a heat source generated during brake activation,

the middle layer is made of a magnetically permeable material having low magnetic retentivity,

the cover layer is made of a non-magnetic distortive material and defines openings, each opening exposing a different part of the middle layer.

14. The composite exciter ring according to claim 13, wherein the base layer is made of a ceramic material.

15. The composite exciter ring according to claim 14, wherein the cover layer is made of a plastic material.

16. The composite exciter ring according to claim 15, wherein the middle layer is exposed through the different openings of the cover layer.

17. The composite exciter ring according to claim 16, wherein the middle layer is a steel material.

18. The composite exciter ring according to claim 17, wherein the base layer, the middle layer, and the cover layer are substantially ring shaped.

19. The composite exciter ring according to claim 18, wherein the cover layer is disposed radially inward relative to the base layer, such that a region of the middle layer and base layer that is radially outward relative to the cover layer is fully exposed.

20. The composite exciter ring according to claim 19, wherein the base layer defines therein openings configured to receive a fastener that couples the composite exciter ring to another brake component.

21. An air brake system for a vehicle comprising:

a rotating member configured to rotate in response to a motion of the vehicle;

the composite exciter ring according to claim 15, wherein

the composite exciter ring is coupled to the rotating member; and

a variable reluctance sensor configured to respond to changes in the magnetic field induced by the rotation of the composite exciter ring.

22. The air brake system according to claim 21, wherein the rotating member is one of a brake rotor, a drum, and a wheel hub.

23. A composite exciter ring for use in a vehicle brake system, comprising:

a base layer that is made of a ceramic material; and

a cover layer that is made of a plastic material and that is disposed on the base layer, wherein

the base layer is configured to thermally insulate the cover layer from a heat source generated during operation of the vehicle brake system,

the cover layer defines openings that are configured to expose first parts of the base layer, while covering second parts of the base layer, the first and second parts being arranged next to one another in an alternating fashion along a given direction, and

the ceramic material includes an additive infused therein that has an effect on a magnetic field.

24. The composite exciter ring according to claim 23, wherein the additive is infused only in the first parts where the base layer is exposed, such that the rest of the base layer is substantially devoid of the additive.

25. The composite exciter ring according to claim 24, wherein the additive is a magnetically permeable material.

26. The composite exciter ring according to claim 25, wherein an amount of the additive corresponds to a minimum amount needed to alter the magnetic field.

27. The composite exciter ring according to claim 26, wherein the additive is ferritic.

28. The composite exciter ring according to claim 27, wherein the base layer and the cover layer are substantially ring shaped.

29. The composite exciter ring according to claim 28, wherein the cover layer is disposed radially inward relative to the base layer, such that a region of the base layer that is radially outward of the cover layer is fully exposed.

30. The composite exciter ring according to claim 29, wherein the base layer defines therein openings configured to receive a fastener that couples the composite exciter ring to another brake component.

31. A composite exciter ring for use in a vehicle brake system, comprising:

a base layer that is made of a ceramic material;

a middle layer that is made of a permeable material and that is disposed on the base layer; and

a cover layer that is disposed on the middle layer and that is made of a plastic material, wherein

the base layer is configured to thermally insulate the middle layer and the cover layer from a heat source generated during operation of the vehicle brake system,

the middle layer is configured to have an effect on a magnetic field that is detectable by a sensor of the vehicle brake system, detection of the signal being necessary to operate the vehicle brake system, and

the cover layer defines openings that are configured to expose first parts of the middle layer, while covering second parts of the middle layer, the first and second parts being arranged next to one another in an alternating fashion along a given direction.

32. The composite exciter ring according to claim 31, wherein the middle layer is disposed on the base layer only in regions of the base layer that are exposed by the openings of the cover layer.

33. The composite exciter ring according to claim 32, wherein the base layer and the cover layer are substantially ring shaped.

34. The composite exciter ring according to claim 33, wherein the cover layer is disposed radially inward relative to the base layer, such that a region of the base layer that is radially outward of the cover layer is fully exposed.

35. The composite exciter ring according to claim 34, wherein the base layer defines therein openings configured to receive a fastener that couples the composite exciter ring to another brake component.