Axle beam having a cavity

1. An axle beam comprising:

a beam portion having an I-shaped cross section; and

a kingpin mounting portion disposed at an end of the beam portion, wherein the kingpin mounting portion includes:

a kingpin hole;

an end hole that is spaced apart from the kingpin hole;

a cavity that is disposed in the kingpin mounting portion adjacent to the kingpin hole and the end hole; and

a drain hole that is spaced apart from the end hole and that extends from the cavity through the kingpin mounting portion.

2. The axle beam of claim 1 wherein the drain hole is disposed below the end hole.

3. The axle beam of claim 2 wherein the end hole and the drain hole have an oval configuration.

4. The axle beam of claim 2 wherein the drain hole is disposed proximate a cavity end wall that is disposed in the cavity and disposed opposite the end hole.

5. The axle beam of claim 2 wherein the drain hole extends through a lower wall of the kingpin mounting portion to the cavity.

6. The axle beam of claim 2 wherein the kingpin mounting portion has a side wall that partially defines the cavity and is offset from a center beam axis, wherein the drain hole extends through the side wall.

7. The axle beam of claim 1 wherein the kingpin mounting portion has an upper wall, a lower wall disposed opposite the upper wall, and first and second side walls that extend from the upper wall to the lower wall, wherein the upper wall, lower wall, and the first and second side walls cooperate to at least partially define the cavity.

8. The axle beam of claim 7 wherein the end hole extends from the upper wall to the lower wall.

9. The axle beam of claim 7 further comprising a cavity end wall that extends from the upper wall to the lower wall, wherein the cavity end wall is disposed at an end of the cavity.

10. The axle beam of claim 9 wherein the cavity narrows in a direction that extends from the end hole to the cavity end wall.

11. The axle beam of claim 9 wherein the upper wall has a spring pad, wherein the cavity end wall is disposed below the spring pad.

12. The axle beam of claim 1 wherein the cavity narrows in a direction that extends from the end hole toward the beam portion.

13. An axle beam comprising:

a beam portion having an I-shaped cross section; and

a kingpin mounting portion disposed at opposite ends of the beam portion, wherein each kingpin mounting portion includes:

an upper wall having a first kingpin hole;

a lower wall having a second kingpin hole;

a first side wall that extends from the upper wall to the lower wall;

a second side wall that is spaced apart from the first side wall and extends from the upper wall to the lower wall;

an arcuate end wall that extends from the first side wall to the second side wall and defines an end hole; and

a cavity that is disposed in the kingpin mounting portion and extends from the end hole toward the beam portion, wherein the cavity is at least partially defined by the upper wall, the lower wall, the first side wall, the second side wall, and the arcuate end wall.

14. The axle beam of claim 13 wherein the first kingpin hole and a second kingpin hole are coaxially disposed along a kingpin hole axis.

15. The axle beam of claim 14 wherein the arcuate end wall is radially disposed with respect to the kingpin hole axis.

16. The axle beam of claim 13 further comprising a drain hole that extends through the kingpin mounting portion adjacent to the lower wall.

17. The axle beam of claim 13 further comprising a cavity end wall that extends from the upper wall to the lower wall and from the first side wall to the second side wall, wherein the cavity end wall is disposed at an end of the cavity opposite the end hole.

18. The axle beam of claim 17 further comprising a drain hole that extends through the first side wall and/or the second side wall and is disposed adjacent to the cavity end wall.

19. The axle beam of claim 17 further comprising a drain hole that extends through the lower wall.

20. The axle beam of claim 19 wherein the drain hole is aligned with the cavity end wall.