Rear diffusor unit with a flow-directing sealing element

1. A rear diffusor unit, comprising:

a base element configured to be mounted in a fixed position on a body of a vehicle;

a movable diffusor element;

a flow-directing sealing element connecting the base element to the movable diffusor element; and

a drive device with which the movable diffusor element is movable relative to the base element between two end positions,

wherein the diffusor element is a box diffusor element having two fixed side walls, a fixed rear wall, and a fixed base, the fixed side walls and the fixed rear wall extending away from the fixed base, and

wherein the flow-directing sealing element is arranged on the movable diffusor element at a connecting region between the fixed side walls, the flow-directing sealing element forming a fluidic seal between the base element and the moveable diffusor element.

2. The rear diffusor unit as claimed in claim 1 , wherein the flow-directing sealing element has a multipart design with at least two elastically deformable elements and at least one non-deformable element arranged in between.

3. The rear diffusor unit as claimed in claim 2 , wherein the flow-directing sealing element is a film hinge.

4. The rear diffusor unit as claimed in claim 1 , wherein the flow-directing sealing element extends over at least 50% of an entire width of the movable diffusor element.

5. The rear diffusor unit as claimed in claim 1 , wherein the flow-directing sealing element is an elastically deformable sealing element.

6. The rear diffusor unit as claimed in claim 1 , wherein the flow-directing sealing element is configured as a flow-directing hinge element which pivotably connects the base element to the diffusor element.

7. The rear diffusor unit as claimed in claim 1 ,

wherein the diffusor element has a U-shaped basic shape, and

wherein the flow-directing sealing element is arranged on the movable diffusor element on an inner side of the connecting region.

8. The rear diffusor unit as claimed in claim 7 , wherein the diffusor element is pivotable along the inner side of the connecting region between the side walls.

9. A vehicle with a rear diffusor unit as claimed in claim 1 .

10. The rear diffusor unit as claimed in claim 7 ,

wherein the fixed rear wall is arranged between the fixed side walls,

wherein the fixed rear wall is connected with the fixed side walls to form a continuous wall along a periphery of at least a curved portion the fixed base, and

wherein the fixed base extends continuously between inner facing sides of the continuous wall.

11. The rear diffusor unit as claimed in claim 1 , wherein the connection region is at an edge of the fixed base that is facing the base element and that is opposite to a side of the diffusor element having the rear wall.

12. The rear diffusor unit as claimed in claim 9 ,

wherein the box diffusor element is rigid,

wherein the box diffusor element is configured to pivot along the connecting region, a pivot axis running transversely with respect to a longitudinal direction of the vehicle,

wherein the flow-directing sealing element is connected to the box diffusor element and the base element along the pivot axis, and

wherein the rear wall of the box diffusor element is configured to pivot out the body of the vehicle and configured to prevent backflow,

wherein the box diffusor element is configure to pivot with respect to the base element, the base element remaining fixed.

13. The rear diffusor unit as claimed in claim 12 , wherein the two end positions respectively correspond to a retracted state of the box diffusor and an extended state of the box diffusor, the extended state of the box diffusor being configured to reduce a distance between the box diffusor and a carriage way surface as compared to the retracted state.

14. The rear diffusor unit as claimed in claim 1 , wherein the flow-directing sealing element covers a gap between the movable diffuser element and the base element.