Vehicle body including reinforcement on rocker panel

1. A vehicle body comprising:

a rocker panel elongated along an axis;

a pillar fixed to the rocker panel and elongated in a direction transverse to the axis;

the rocker panel including a first flange and a second flange, the first flange and the second flange being on opposite sides of the pillar and spaced from each other with a gap between the first flange and the second flange in a direction parallel to the axis;

a reinforcement having a lower member extending across the gap from the first flange to the second flange, the lower member fixed to the first and second flanges, the reinforcement including an upper member spaced from the lower member transverse to the axis, the upper member being fixed to the pillar; and

a seat belt retractor between the upper member and the lower member.

2. The vehicle body of claim 1 , wherein the pillar and the rocker panel are integral.

3. The vehicle body of claim 1 , wherein the upper member is elongated in a direction transverse to the axis.

4. The vehicle body of claim 1 , wherein the lower member extends along the pillar from the rocker panel toward the upper member.

5. The vehicle body of claim 1 , wherein the rocker panel includes a lower flange elongated along the axis, the lower flange being spaced from the first and second flanges in a direction transverse to the axis.

6. The vehicle body of claim 1 , further comprising a second pillar fixed to the rocker panel and elongated in a direction transverse to the axis, and a roof rail extending from the pillar to the second pillar.

7. The vehicle body of claim 6 , wherein the pillar, the second pillar, the rocker panel, and the roof rail are all integral.

8. The vehicle body of claim 6 , wherein the pillar, the second pillar, the rocker panel, and the roof rail define an opening.

9. The vehicle body of claim 1 , wherein the first flange and the second flange are elongated on a common axis, the common axis being parallel to the axis.

10. The vehicle body of claim 1 , wherein the rocker panel includes an interior surface and an exterior surface opposite the interior surface, and the first and second flanges are disposed on the interior surface.

11. The vehicle body of claim 1 , wherein the first and second flanges each have a step elongated along the axis, each step having a step shape, and the reinforcement having a step shape matching the step shape of the steps.

12. The vehicle body of claim 1 , wherein the pillar and the lower member define a gap, the gap being between the pillar and the lower member.

13. The vehicle body of claim 12 , a wherein the seat belt retractor is in the gap and fixed to the lower member.

14. The vehicle body of claim 13 , wherein the lower member includes a cavity receiving the seat belt retractor.

15. The vehicle body of claim 1 , wherein the rocker panel includes a lower flange elongated along the axis and spaced from the first and second flanges, and a channel defined by the lower flange and the first and second flanges.

16. The vehicle body of claim 15 , further comprising a plurality of reinforcing members in the channel.

17. The vehicle body of claim 16 , further comprising an inner rocker panel elongated along the axis and fixed to the rocker panel, the channel being between the rocker panel and the inner rocker panel.

18. The vehicle body of claim 1 , wherein the upper member includes a channel elongated in a direction transverse to the axis, and further comprising a seat belt webbing extending from the seat belt retractor along the channel.

19. The vehicle body of claim 1 , further comprising an inner rocker panel elongated along the axis and fixed to the rocker panel, the lower member of the reinforcement being between the rocker panel and the inner rocker panel.