Periodic-wave disc brake rotor

1. A disc brake rotor, comprising:

an annular portion having a first surface and a second surface in opposition to said first surface, said annular portion having an axial thickness T between said first surface and said second surface, said first surface and said second surface traversing a periodic wave wherein an inner radial edge of said annular portion traverses an inner periodic wave and an outer radial edge of said annular portion traverses an outer periodic wave, and wherein a pattern and a period are the same for said periodic wave, said inner periodic wave, and said outer periodic wave; and

thermal radiation elements coupled to said inner radial edge between adjacent crests of said inner periodic wave and coupled to said outer radial edge between adjacent crests of said outer periodic wave.

2. A disc brake rotor as in claim 1 , further comprising:

first dimples in said first surface;

second dimples in said second surface; and

each of said first dimples being aligned with a corresponding one of said second dimples wherein a lamina is defined there between.

3. A disc brake rotor as in claim 2 , wherein said first dimples and said second dimples comprise circular dimples.

4. A disc brake rotor as in claim 3 , wherein said circular dimples have a diameter D and a depth d, wherein said lamina has an axial thickness m at said depth d, wherein a ratio of D/d is in a range of 2 to 20, and wherein a ratio of m/T is in a range of 0.1 to 0.3.

5. A disc brake rotor as in claim 2 , wherein said first dimples and said second dimples comprise elongated dimples.

6. A disc brake rotor as in claim 5 , wherein said elongated dimples have a width W and a depth d, wherein said lamina has an axial thickness m at said depth d, wherein a ratio of W/d is in a range of 2 to 20, and wherein a ratio of m/T is in a range of 0.1 to 0.3.

7. A disc brake rotor as in claim 1 , wherein at least one of said first surface and said second surface includes dimples.

8. A disc brake rotor as in claim 7 , further comprising a material coating surfaces of said dimples wherein said material has a thermal emissivity value in a range of 0.30 to 0.99.

9. A disc brake rotor as in claim 1 , wherein said thermal radiation elements have an axial thickness t, and wherein a ratio of t/T is in a range of 0.1 to 0.3.

10. A disc brake rotor, comprising:

an annular portion having a first surface and a second surface in opposition to said first surface, said annular portion having an axial thickness T between said first surface and said second surface, said first surface and said second surface traversing a periodic wave wherein an inner radial edge of said annular portion traverses an inner periodic wave and an outer radial edge of said annular portion traverses an outer periodic wave, and wherein a pattern and a period are the same for said periodic wave, said inner periodic wave, and said outer periodic wave;

thermal radiation elements coupled to said inner radial edge between adjacent crests of said inner periodic wave and coupled to said outer radial edge between adjacent crests of said outer periodic wave, said thermal radiation elements having an axial thickness t, and wherein a ratio of t/T is in a range of 0.1 to 0.3; and

at least one of said first surface and said second surface includes dimples.

11. A disc brake rotor as in claim 10 , wherein said dimples comprise:

first dimples in said first surface;

second dimples in said second surface; and

each of said first dimples being aligned with a corresponding one of said second dimples wherein a lamina is defined there between.

12. A disc brake rotor as in claim 11 , wherein said first dimples and said second dimples comprise circular dimples.

13. A disc brake rotor as in claim 12 , wherein said circular dimples have a diameter D and a depth d, wherein said lamina has an axial thickness m at said depth d, wherein a ratio of W/d is in a range of 2 to 20, and wherein a ratio of m/T is in a range of 0.1 to 0.3.

14. A disc brake rotor as in claim 11 , wherein said first dimples and said second dimples comprise elongated dimples.

15. A disc brake rotor as in claim 14 , wherein said elongated dimples have a width W and a depth d, wherein said lamina has an axial thickness m at said depth d, wherein a ratio of D/d is in a range of 2 to 20, and wherein a ratio of m/T is in a range of 0.1 to 0.3.

16. A disc brake rotor as in claim 11 , further comprising a material coating surfaces of said dimples wherein said material has a thermal emissivity value in a range of 0.30 to 0.99.