Locomotive-radiator-cooling-fan tankhead assembly

1. Apparatus comprising a locomotive-radiator-cooling-fan tankhead assembly having a substantially-circular base plate and a substantially-circular outer ring,

wherein the base plate and the outer ring each consist essentially of an aluminum alloy,

wherein a maximum diameter of the base plate divided by a maximum thickness of the base plate is between 5 and 15, and wherein the maximum diameter of the base plate divided by a maximum thickness of the outer ring is between 20 and 30,

wherein the base plate has a central longitudinal axis and a circumference,

wherein the outer ring is substantially coaxially aligned with the central longitudinal axis and is attached to the base plate proximate the circumference,

wherein the base plate has a substantially-planar first surface having a central recess substantially coaxially aligned with the central longitudinal axis and having circumferentially-separated, first and second peripheral recesses each radially spaced apart from the central recess and extending radially inward from proximate the circumference,

wherein the outer ring longitudinally extends beyond the first surface, and

wherein the tankhead assembly is devoid of any gussets attached to the base plate and is devoid of any gussets attached to the outer ring.

2. The apparatus of claim 1 , wherein the outer ring is welded to the base plate.

3. The apparatus of claim 2 , wherein the outer ring is adapted to contact and support radially-outwardly-extending, non-rotatable vanes.

4. The apparatus of claim 3 , wherein base plate is adapted to contact and support a fan-motor stator assembly.

5. The apparatus of claim 1 , wherein the outer ring has substantially-radially-extending first and second through holes, wherein the first through hole abuts the first peripheral recess and is adapted to receive low-motor-speed electrical wiring, and wherein the second through hole abuts the second peripheral recess and is adapted to receive high-motor-speed electrical wiring.

6. The apparatus of claim 5 , wherein the first surface, apart from the first and second peripheral recesses, has a circumferential step, and wherein the outer ring abuts the circumferential step.

7. The apparatus of claim 6 , wherein the first and second peripheral recesses are non-diametrically opposed.

8. The apparatus of claim 7 , wherein the central recess and the circumferential step together have a radial extent less than twenty-five percent of the maximum diameter of the base plate.

9. The apparatus of claim 8 , wherein the first and second peripheral recesses each have a radial extent less than thirty percent of the maximum diameter of the base plate.

10. The apparatus of claim 1 , wherein the base plate has a thickness at the circumferential step, at the central recess, and at the first and second peripheral recesses which is substantially one-third the maximum thickness of the base plate.

11. Apparatus comprising a locomotive-radiator-cooling-fan tankhead assembly having a substantially-circular base plate and a substantially-circular outer ring,

wherein the base plate has a central longitudinal axis and a circumference,

wherein the outer ring is substantially coaxially aligned with the central longitudinal axis and is attached to the base plate proximate the circumference,

wherein the base plate has a substantially-planar first surface having a central recess substantially coaxially aligned with the central longitudinal axis and having circumferentially-separated, first and second peripheral recesses each radially spaced apart from the central recess and extending radially inward from proximate the circumference,

wherein the outer ring longitudinally extends beyond the first surface, and

wherein the tankhead assembly is devoid of any gussets attached to the base plate and is devoid of any gussets attached to the outer ring.

12. The apparatus of claim 11 , wherein the outer ring is welded to the base plate.

13. The apparatus of claim 12 , wherein the outer ring is adapted to contact and support radially-outwardly-extending, non-rotatable vanes.

14. The apparatus of claim 13 , wherein base plate is adapted to contact and support a fan-motor stator assembly.

15. The apparatus of claim 11 , wherein the outer ring has substantially-radially-extending first and second through holes, wherein the first through hole abuts the first peripheral recess and is adapted to receive low-motor-speed electrical wiring, and wherein the second through hole abuts the second peripheral recess and is adapted to receive high-motor-speed electrical wiring.

16. The apparatus of claim 15 , wherein the first surface, apart from the first and second peripheral recesses, has a circumferential step, and wherein the outer ring abuts the circumferential step.

17. The apparatus of claim 16 , wherein the first and second peripheral recesses are non-diametrically opposed.

18. The apparatus of claim 17 , wherein the central recess and the circumferential step together have a radial extent less than twenty-five percent of the maximum diameter of the base plate.

19. The apparatus of claim 18 , wherein the first and second peripheral recesses each have a radial extent less than thirty percent of the maximum diameter of the base plate.

20. The apparatus of claim 11 , wherein the base plate has a thickness at the circumferential step, at the central recess, and at the first and second peripheral recesses which is substantially one-third the maximum thickness of the base plate.