Side skirt for a pulled vehicle
The present invention relates to a device for minimizing the aerodynamic drag that results when tractors, trailers, rigid trucks, lorries, and other vehicles are moving through air. In particular the invention relates to a plate-shaped flow conductor having a front edge, a lower edge, a rear edge and an upper edge. The flow conductor is mountable along the upper edge in a substantially vertical position to a body portion of a pulled vehicle of a vehicle combination of at least two pivotally connected vehicles. When mounted the flow conductor extends at least partially under the body portion in a longitudinal direction of the pulled vehicle. Characteristic for the flow conductor according to the invention is that the flow conductor comprises locally in conjunction with the front edge a thickened portion, which has a streamlined outer contour in a cross section transversally to the front edge.
1. Flow conductor for use as a side skirt, which is plate-shaped having a front edge, a lower edge, a rear edge and an upper edge, wherein the flow conductor is mountable along the upper edge in a substantially vertical position to a body portion of a pulled vehicle of a vehicle combination of at least two pivotally connected vehicles, wherein the flow conductor extends at least partially under the body portion in a longitudinal direction along an outer edge of the pulled vehicle, wherein the flow conductor comprises locally in conjunction with the front edge a thickened portion, which has in a cross-section transversally to the front edge a streamlined outer contour.
2. Flow conductor according to claim 1 , wherein the outer contour of the thickened portion in cross section comprises a curvature with an airfoil part.
3. Flow conductor according to claim 1 , wherein the outer contour comprises a curvature with an elliptical part.
4. Flow conductor according to claim 1 , wherein the outer contour comprises a curvature with a circular part having a radius of at least 100 mm.
5. Flow conductor according to claim 1 , wherein the thickness of the thickened portion is at least 50 mm.
6. Flow conductor according to claim 1 , wherein the flow conductor comprises an inner and an outer surface for positioning the flow conductor with the inner surface to the inside of a pulled vehicle, wherein the thickened portion has a height dimension in a direction perpendicular to the outer surface of the flow conductor of at least 50 mm.
7. Flow conductor according to claim 1 , wherein the thickened portion of the flow conductor extends through an imaginary plane which is parallel to the outer surface of the flow conductor at a distance of 100 mm.
8. Flow conductor according to claim 7 , wherein the imaginary plane is parallel to the outer surface of the flow conductor at a distance of 210 mm.
9. Flow conductor according to claim 1 , wherein the plate shaped flow conductor comprises an inner and an outer surface, which inner surface is to be arranged inwards with respect to a vehicle, when the flow conductor is to be mounted to a vehicle, wherein the thickened portion is positioned at the inner surface of the flow conductor.
10. Flow conductor according to claim 1 , wherein the flow conductor extends over substantially the whole length of the vehicle to guide an air stream from the front of the vehicle along the underside of the body portion to the back of the vehicle.
11. Flow conductor according to claim 1 , wherein a front chamfer is provided between the front edge and the lower edge.
12. Flow conductor according to claim 1 , wherein a rear chamfer is provided between the rear edge and the lower edge.
13. Flow conductor according to claim 1 , wherein the front or rear chamfer has a dimension in a direction of the front edge of at least 100 mm.
14. Flow conductor according to claim 1 made of dicyclopentadiene.
15. Aerodynamic device comprising a set of two flow conductors according to claim 1 , wherein the flow conductors have a geometry in substantially mirror symmetry.
16. Trailer having an undercarriage which is supported by a wheel assembly, wherein the trailer comprises a flow conductor according to claim 1 .
17. Trailer according to claim 16 , wherein cool gaps are provided in the flow conductor at a position near the wheel assembly to provide a passage for air to cool a wheel of the trailer.
18. Vehicle which can be pulled in a vehicle-combination having a body portion which is supported by at least one wheel assembly comprising a flow conductor underneath the body portion according to claim 1 .
19. Vehicle according to claim 18 , wherein the flow conductor is pivotally connected to the body portion.
20. Vehicle according to claim 18 , wherein the front edge of the flow conductor is substantially aligned with the front surface of the body portion of the vehicle.