Flow control device for truck and truck comprising such flow control device

1. Flow control device for a truck, that comprises at least one air deflector blade ( 10 , 12 ) that can be arranged in an operating position as a contour extension on a rear truck end ( 52 ), that forms an air deflector area and that is installed in a way as to be flexibly tiltable around a swivel axis by means of an adjustment unit between the operating position (I) and a stowing position (II),

wherein the air deflector blade ( 10 , 12 ) comprises at least one air deflector element ( 14 , 18 ) and at least one flexible sliding element ( 16 , 20 ) that can be moved translationally in relation to the air deflector element ( 14 , 18 ) in parallel to the swivel axis and is installed on the air deflector element ( 14 , 18 ); and

wherein the at least one air deflector blade comprises two lateral air deflector blades ( 10 ) for flow control on opposite lateral areas ( 4 ) of the truck ( 1 ) and one top-side air deflector blade ( 12 ) for flow control on a roof area ( 2 ) of the truck ( 1 ), whereby each lateral air deflector blade ( 10 ) comprises an air deflector element ( 18 ) and a flexible sliding element ( 20 ), whereby the top-side air deflector blade ( 12 ) comprises two air deflector elements ( 14 ) and two sliding elements ( 16 ) and the flexible sliding element ( 20 ) of each lateral air deflector blade ( 10 ) is adjacent to a sliding element ( 16 ) of the top-side air deflector blade ( 12 ) in the operating position (I) to form a corner area of the flow control device.

2. Flow control device according to claim 1 , wherein at least one of the air deflector blades ( 10 ) can be lifted by means of a swivel axis body ( 70 ), which is enclosed by a sleeve ( 74 ) equipped with a helical groove ( 72 ) that is penetrated by a joint rod ( 42 ) connected to the swivel axis body ( 70 ) and the respective air deflector blade ( 10 ).

3. Flow control device for a truck, that comprises at least one air deflector blade ( 10 , 12 ) that can be arranged in an operating position as a contour extension on a rear truck end ( 52 ), that forms an air deflector area and that is installed in a way as to be flexibly tiltable around a swivel axis by means of an adjustment unit between the operating position (I) and a stowing position (II), wherein the air deflector blade ( 10 , 12 ) comprises at least one air deflector element ( 14 , 18 ) and at least one flexible sliding element ( 16 , 20 ) that can be moved translationally in relation to the air deflector element ( 14 , 18 ) in parallel to the swivel axis, wherein sliding elements ( 16 , 20 ) that are adjacent to each other form a corner area ( 22 ) in the operating position (I) and wherein adjacent air deflector blades are mechanically coupled to each other at their non-attached end in the corner area.

4. Flow control device for a truck ( 1 ) according to claim 3 , wherein the air deflector blade ( 10 , 12 ) comprises a top-side air deflector blade ( 12 ) which is divided by and symmetric to a central longitudinal axis ( 62 ).

5. Flow control device for a truck ( 1 ) according to claim 3 , further comprising at least one assembly plate ( 54 ) on which the air deflector blade ( 10 , 12 ) is installed tiltably and with an actuator.

6. Flow control device for a truck, that comprises at least one air deflector blade ( 10 , 12 ) that can be arranged in an operating position as a contour extension on a rear truck end ( 52 ), that forms an air deflector area and that is installed in a way as to be flexibly tiltable around a swivel axis by means of an adjustment unit between the operating position (I) and a stowing position (II), wherein the air deflector blade ( 10 , 12 ) has an outer area ( 32 ) which forms, in a cross-section view, a tangent on a longitudinal edge (LE) of a rectangle (R) at a front edge ( 36 ) of the air deflector blade ( 10 , 12 ) and which is located in a corner point of the longitudinal edge (LE) with a transversal edge (TRE) of the rectangle (R) in whose opposite corner point there is a rear edge ( 44 ) of the air deflector blade ( 10 , 12 ), whereby the outer area ( 32 ) between the front edge and the rear edge ( 36 , 44 ) is convex curved and whereby the longitudinal edge (LE) of the rectangle (R) has a length (L) of between 350 and 700 mm, and whereby the transversal edge (TRE) has a feed length (F) of between 0.2 and 0.3 of the length (L) of the longitudinal edge (LE) and

further comprising an indentation (ID) extending away in a linear rear edge section (RES), which is installed in an upper area of a lateral air deflector blade ( 10 ).

7. Flow control device for a truck ( 1 ) according to claim 6 , comprising a top-side air deflector blade ( 12 ) with a trough (TR) that is symmetric to a central longitudinal axis ( 62 ) in the operating position (I) and that is formed as a recess in relation to linear lateral sections (LS) of a rear edge ( 44 ) of the top-side air deflector blade ( 12 ).

8. Flow control device for a truck ( 1 ) according to claim 6 , wherein the lateral air deflector blade ( 10 ) in the operating position (I) has a height of between 1,200 and 2,700 mm.

9. Flow control device for a truck ( 1 ) according to claim 6 , wherein the indentation (ID) is limited on both sides by segments of the linear rear edge section (RES 1 , RES 2 ).

10. Flow control device for a truck ( 1 ) according to claim 9 , wherein an upper end (UEID) of the indentation (ID) with a distance of between 200 and 300 mm from a top edge (TE) of the lateral air deflector blade ( 10 ) extends away from the linear rear edge section (RES) and/or extends away from the linear rear edge section (RES) with a lower end (LEID) at a distance of between 500 and 600 mm from the top edge (TE).

11. Flow control device for a truck ( 1 ) according to claim 6 , wherein an upper edge (UE) of the lateral air deflector blade ( 10 ) is formed by a convex curved feed that is retracted downward and that levels off with a <5° angle in relation to the horizontal plane.

12. Flow control device for a truck ( 1 ) according to claim 7 , wherein the trough (TR) extends with a lateral distance (LD) of between 0.2 and 0.3, of a width (W) of the top-side air deflector blade ( 12 ), from the linear lateral sections (LS).

13. Flow control device for a truck ( 1 ) according to claim 12 wherein the trough (TR) has a trough depth ([D]) of between 0.15 and 0.25 of the length (L).

14. Flow control device for a truck ( 1 ) according to claim 7 , wherein a lateral contour (LAC) of the top-side air deflector blade ( 12 ) is formed by a convex curved feed that is retracted to the inside and that levels off with an angle of <5° towards a parallel line of the central longitudinal axis ( 62 ).

15. Flow control device for a truck ( 1 ) according to claim 7 , wherein movement of the lateral air deflector blade ( 10 ) is mechanically coupled with movement of the top-side air deflector blade ( 12 ).

16. Flow control device for a truck ( 1 ) according to claim 6 wherein two lateral air deflector blades for flow control on opposite lateral areas ( 4 ) of the truck ( 1 ) are each formed as uniform air deflector blades ( 10 ) and that only an upper air deflector blade ( 12 ) for flow control on a roof area ( 2 ) of the truck ( 1 ) comprises an air deflector element as well as one flexible sliding element ( 16 ; 20 ) installed on the edge.