commercial vehicle body

Abstract

Commercial vehicle body, with wall devices (4, 6) and with a roof (8) for delimiting a cargo space (10), wherein a rear-side device (16) for reducing air resistance occurring during driving is assigned to a rear (12) of the commercial vehicle body (2) in a roof area (14) of the commercial vehicle body (2), wherein the rear-side device (16) for reducing air resistance occurring during driving has at least one flow guide surface (18), characterized in that the flow guide surface (18) does not have a rear overhang.

Description

[0001] The present invention relates to a commercial vehicle body, with wall devices and with a roof for delimiting a cargo space, wherein a rear-side device for reducing air resistance occurring during driving is assigned to a rear of the commercial vehicle body in a roof area of ​​the commercial vehicle body, wherein the rear-side device for reducing air resistance occurring during driving has at least one flow guide surface.

[0002] It is known to incorporate a rear-facing device on a commercial vehicle body to reduce air resistance during driving. Document DE 10 2024 103 157 A1, which originates from the applicant, describes the integration of a flow-guided surface into a rear portal beam of a commercial vehicle body. According to DE 10 2024 103 157 A1, this flow-guided surface extends cantilevered over a door assembly at the rear and has a rear overhang. While this rear overhang of the flow-guided surface increases the overall length of the vehicle, this disadvantage is accepted due to the aerodynamic advantages.

[0003] Against this background, the present invention addresses the technical problem of providing an improved commercial vehicle body. The technical problem described above is solved by the features of independent claim 1. Further embodiments of the invention are described in the dependent claims and the following description.

[0004] According to the invention, a commercial vehicle body is provided, with wall devices and with a roof for delimiting a cargo space, wherein a rear-facing device for reducing air resistance occurring during driving is assigned to a rear of the commercial vehicle body in a roof area of ​​the commercial vehicle body, wherein the rear-facing device for reducing air resistance occurring during driving has at least one flow guide surface, wherein the flow guide surface has no rear overhang.

[0005] Investigations by the applicant have surprisingly shown that the aerodynamic drag of the commercial vehicle body can be further reduced if the flow guide surface does not have a rear overhang. That is, contrary to previous assumptions which assumed an improvement in aerodynamic drag through the rear overhang of the flow guide surface, further tests, investigations and simulations have surprisingly shown that the best results in reducing aerodynamic drag are achieved when the flow guide surface does not extend outwards at the rear, but rather is essentially flush with or at the same height as the rear of the commercial vehicle body in the longitudinal direction.

[0006] This allows for an overall improvement in the aerodynamic properties of a commercial vehicle body, i.e., with reduced air resistance during driving, without increasing the overall length of the vehicle body. This simplifies the integration of such a rear-facing airflow guide surface into existing commercial vehicle body designs and / or retrofitting.

[0007] In particular, it may be provided that the flow guide surface, viewed in the longitudinal direction of the commercial vehicle body, is essentially flush with a wall device that delimits the rear of the cargo space, or is set back from the wall device that delimits the rear of the cargo space.

[0008] Such a wall device that limits the cargo space at the rear can be, for example, a rear door system or a rear tarpaulin.

[0009] It may be provided that a plurality of guide elements are assigned to the rear in the roof area, wherein the guide elements are designed to generate vortices in an airflow existing along the roof during driving operation, wherein the guide elements are arranged at a distance from the flow guide surface, and are distributed along a width of the commercial vehicle body.

[0010] The guide elements serve to introduce turbulence or vortices into the roof airflow that occurs during driving, before it is guided along the rear flow guide surface. The guide elements are therefore located upstream of the flow guide surface, i.e., in front of the flow guide surface when driving straight ahead.

[0011] Investigations by the applicant have shown that by arranging the guide elements upstream and at a distance from the flow guide surface, the air resistance during operation can be reduced. The combination of the guide elements with the rear flow guide surface reduces the air resistance compared to using the rear flow guide surface without the guide elements.

[0012] It is important that the guide elements are positioned at a distance from the rear flow guide surface when viewed in the direction of flow. Further investigations by the applicant have shown that arranging the guide elements directly on the rear flow guide surface, i.e., without a distance from the flow guide surface, increases air resistance compared to using the flow guide surface without the guide elements, and is therefore disadvantageous compared to previously known solutions. Arranging the guide elements directly on the flow guide surface thus impairs the air resistance-reducing effect of the flow guide surface.

[0013] The guide elements can also be described as vortex generators. Located at the rear of the commercial vehicle's roof, these vortex generators improve aerodynamics by delaying or preventing the separation of the airflow along the roof during driving. This results in a mixing of slower-moving air from the roof's boundary layer with faster-moving air from a greater distance. In other words, the vortex generators selectively create small vortices that activate and stabilize the boundary layer. This causes the airflow to remain attached to the roof for longer, reducing the wake vortex behind the vehicle's body. This lowers drag and improves energy efficiency. In practice, this translates to lower fuel consumption and reduced CO2 emissions.

[0014] Investigations by the applicant have shown that the combination of the guide elements with the flow guide surface according to the invention, which has no rear overhang, surprisingly results in a particularly low air resistance during driving.

[0015] According to one embodiment of the commercial vehicle body, it can be provided that the guide elements are arranged in pairs, with each pair of guide elements forming a guide element pair.

[0016] It may be provided that the guide elements of a respective pair of guide elements have a distance to each other that narrows in the direction of the flow guide surface.

[0017] According to one design of the commercial vehicle body, it can be provided that the guide elements of a respective pair of guide elements have a V-shaped, symmetrically narrowing distance to each other.

[0018] It may be provided that the guide elements of a respective pair of guide elements have ends facing the flow guide surface, wherein these ends facing the flow guide surface are spaced apart from each other, or abut each other, or are formed integrally with each other.

[0019] According to one embodiment of the commercial vehicle body, it may be provided that the guide elements of a respective pair of guide elements enclose an angle greater than or equal to 20 degrees and less than or equal to 40 degrees to each other, in particular an angle of 30 degrees to each other.

[0020] It may be provided that the pairs of guide elements have an equidistant distance from each other.

[0021] According to one embodiment of the commercial vehicle body, it can be provided that the guide elements are arranged in a row along the width of the commercial vehicle body, in particular that the guide elements have no offset when viewed in the longitudinal direction of the commercial vehicle body.

[0022] It may be provided that each guiding element is a vertical fin.

[0023] According to one design of the commercial vehicle body, it can be provided that the height of a respective guide element decreases in the direction of the flow guide surface.

[0024] It may be provided that an end section of a respective guide element facing away from the flow guide surface has a convex contour that transitions into a substantially straight upper surface, in particular a substantially horizontal upper surface of the respective guide element.

[0025] According to one design of the commercial vehicle body, it may be provided that the number of guide elements is greater than or equal to ten and less than or equal to thirty.

[0026] It may be provided that the guiding elements have a plastic material, or consist of a plastic material, or that the guiding elements have a metallic material, or consist of a metallic material.

[0027] According to one design of the commercial vehicle body, it may be provided that the guide elements are permanently attached to the roof, in particular by a material-bonded connection, such as welding, soldering or gluing.

[0028] It may be provided that each guide element has a length greater than or equal to 100 mm and less than or equal to 250 mm.

[0029] Alternatively or additionally, it may be provided that each guide element has a height greater than or equal to 20 mm and less than or equal to 30 mm, in particular a height of 25 mm.

[0030] According to one design of the commercial vehicle body, it can be provided that the roof has a roof recess, with the guide elements sitting in the roof recess.

[0031] It may be provided that the roof recess has a width greater than or equal to 1500 mm and less than or equal to 2400 mm, in particular a width of 2300 mm or 2008 mm.

[0032] According to one embodiment of the commercial vehicle body, the roof recess may have a length greater than or equal to 350 mm and less than or equal to 550 mm, in particular a length of 541 mm.

[0033] Alternatively or additionally, it may be provided that the roof recess has a depth greater than or equal to 20 mm and less than or equal to 30 mm, in particular a depth of 25 mm.

[0034] According to one embodiment of the commercial vehicle body, it can be provided that an outer surface of the roof facing the surroundings of the commercial vehicle body defines an overall height of the commercial vehicle body, wherein the guide elements are positioned in the roof recess in such a way that the overall height of the commercial vehicle body is not increased by the guide elements.

[0035] It may be provided that the roof recess has a horizontally extended, planar base on which the guide elements sit with a respective horizontal, planar base contour.

[0036] Alternatively or additionally, it can be provided that the roof recess has a sloping, flat base surface on which the guide elements sit with a respective sloping, flat base contour.

[0037] Alternatively or additionally, the roof trough may be provided with a sloping inlet surface, without any guide elements on the inlet surface.

[0038] According to one embodiment of the commercial vehicle body, it may be provided that the distance of the guide elements to the flow guide surface is more than 100 mm and less than 300 mm, in particular more than 150 mm and less than 200 mm.

[0039] It may be provided that, in addition to the guide elements, a plurality of further guide elements are provided in the roof area, wherein the further guide elements are arranged at a distance from the flow guide surface and to the guide elements, and are distributed along the width of the commercial vehicle body.

[0040] The additional guide elements can be located at a greater distance from the flow control surface than the guide elements themselves. In other words, viewed longitudinally along the vehicle body, the guide elements are positioned between the additional guide elements and the flow control surface. Therefore, with respect to the airflow occurring along the roof during driving, the additional guide elements are located upstream of the guide elements.

[0041] The additional guide elements can be spanned by another flow-guiding surface.

[0042] In particular, it can be provided that the further flow-guiding surface has no inclination, but is essentially horizontally extended.

[0043] For example, it may be provided that the additional flow-guiding surface extends to the level of the roof.

[0044] It may be provided that the additional guide elements support the additional flow-guiding surface.

[0045] The number of additional guide elements can be less than the number of guide elements. In particular, four to sixteen additional guide elements can be provided. For example, ten additional guide elements can be provided.

[0046] The other guiding elements can be arranged in pairs.

[0047] The other guiding elements can essentially be oriented parallel to the longitudinal direction of the commercial vehicle body.

[0048] The other guiding elements can be located in the roof recess.

[0049] For example, the additional guide elements can be positioned in the roof recess in such a way that the overall height of the commercial vehicle body is not increased by the additional guide elements.

[0050] It may be provided that the additional guide elements sit on the horizontally extended, flat base surface of the roof recess, and that the guide elements sit on the inclined, flat base surface of the roof recess.

[0051] It may be provided that the flow guide surface is part of a rear portal beam of the commercial vehicle body.

[0052] According to one embodiment of the commercial vehicle body, it can be provided that the flow guide surface is inclined relative to a horizontal roof plane, wherein the flow guide surface has an orientation inclined downwards from the roof plane.

[0053] It may be provided that the flow guide surface includes an angle of inclination greater than or equal to 10° with a horizontal plane, in particular an angle of inclination greater than or equal to 15° with the horizontal plane, and further in particular an angle of inclination greater than or equal to 18° with the horizontal plane of the roof.

[0054] Alternatively or additionally, it may be provided that the flow guide surface includes an angle of inclination of less than or equal to 40° with the horizontal plane, in particular an angle of inclination of less than or equal to 30° with the horizontal plane, and further in particular an angle of inclination of less than or equal to 24° with the horizontal plane.

[0055] The flow-guiding surface can have a flat shape or it can be curved.

[0056] According to one design of the commercial vehicle body, it may be provided that the horizontal plane is the horizontal roof plane, in particular that the horizontal roof plane is the outside of the roof facing the environment of the commercial vehicle body and away from the cargo space.

[0057] The invention is described in more detail below with reference to an exemplary embodiment shown in a drawing. The drawing schematically depicts: Fig. 1 a rear area of ​​a commercial vehicle body according to the invention in a perspective rear view from above; Fig. 2 the rear area of ​​the commercial vehicle body according to the invention in a top view; Fig. 3 a section of a sectional view according to section A - A from Fig. 2; Fig. 4 an enlarged representation of the section view from Fig. 3; Fig. 5 a rear area of ​​another commercial vehicle body according to the invention in a perspective rear view from above.

[0058] Fig. Figure 1 shows a commercial vehicle body 2 according to the invention. The commercial vehicle body 2 has wall devices 4 and 6 and a roof 8 for limiting a loading space 10.

[0059] A rear-facing device 16 for reducing air resistance occurring during driving is assigned to a rear section 12 of the commercial vehicle body 2 in a roof area 14 of the commercial vehicle body 2. The rear-facing device 16 for reducing air resistance occurring during driving has a flow-guided surface 18. The flow-guided surface 18 has no rear overhang.

[0060] As in Fig. As can be seen in Figure 3, the flow guide surface 18, viewed in the longitudinal direction L of the commercial vehicle body 2, is flush with a wall element 6 that delimits the cargo space 10 at the rear. This means that the flow guide surface 18, viewed in the longitudinal direction L of the commercial vehicle body 2, does not extend beyond the rear wall element 6, so that the overall length L1 of the commercial vehicle body 2 is not increased by the flow guide surface 18.

[0061] As in Fig. As shown in Figure 1, a plurality of guide elements 20 are assigned to the rear 12 of the commercial vehicle body 2 in the roof area 14. The guide elements 20 are designed to generate vortices W in an airflow LS existing along the roof 8 during driving operation, wherein the guide elements 20 are arranged at a distance a from the flow guide surface 18 and are distributed along a lateral direction B of the commercial vehicle body 2.

[0062] The guide elements 20 are arranged in pairs, with each pair of guide elements 20 forming a guide element pair 22.

[0063] As in Fig. As can be seen in Figure 2, the guide elements 20 of each guide element pair 22 have a distance a2 from each other that narrows in the direction of the flow guide surface 18. The guide elements 20 of each guide element pair 22 have a V-shaped, symmetrically narrowing distance a2 from each other.

[0064] The guide elements 20 of each pair of guide elements 22 have ends 24 facing the flow guide surface 18, wherein these ends 24 facing the flow guide surface 18 have a distance a2 from each other and do not touch each other.

[0065] The guide elements 20 of each pair of guide elements 22 enclose an angle a3 greater than or equal to 20 degrees and less than or equal to 40 degrees to each other.

[0066] The guide element pairs 22 have an equidistant distance b1 to each other, i.e., the guide element pairs 22 are arranged evenly distributed in the width direction B.

[0067] The guide elements 20 are arranged in a row along the width B or the width direction B of the commercial vehicle body 2, wherein the guide elements have no offset when viewed in the longitudinal direction L of the commercial vehicle body 2.

[0068] Each guide element 20 is a vertical fin 20.

[0069] The height h1 of each guide element 20 decreases in the direction of the flow guide surface 18.

[0070] The guide elements 20 are made of plastic.

[0071] The guide elements 20 are permanently attached to the roof 8, in particular by a material-bonded connection, such as welding, soldering or gluing.

[0072] Each guide element 20 has a length l2 greater than 100 mm and less than 250 mm.

[0073] Each guide element 20 has a height h1 greater than 20 mm and less than 30 mm.

[0074] The roof 8 has a roof recess 26, with the guide elements 20 sitting in the roof recess 26.

[0075] The roof recess 26 has a width b2 greater than 1500 mm and less than 2400 mm.

[0076] The roof recess has a length l3 greater than 350 mm and less than 550 mm.

[0077] The roof recess has a depth t1 greater than 20 mm and less than 30 mm.

[0078] An outer surface 28 of the roof 8 facing an environment U of the commercial vehicle body 2 defines a total height H of the commercial vehicle body, wherein the guide elements 20 are positioned in the roof recess 26 such that the total height H of the commercial vehicle body 2 is not increased by the guide elements 20.

[0079] The roof recess 26 has a horizontally extended, flat base 30.

[0080] The roof recess 26 has a sloping, flat base 32 on which the guide elements 20 are located.

[0081] The roof recess 26 has a sloping inlet surface 34, whereby no guide elements are located on the inlet surface 34.

[0082] In roof area 14, in addition to the guide elements 20, a plurality of further guide elements 36 are provided.

[0083] The further guide elements 36 are arranged at a distance a2 to the flow guide surface 18 and at a distance a5 to the guide elements 20.

[0084] The other guide elements 36 are arranged distributed along the width B of the commercial vehicle body 2.

[0085] The additional guide elements 36 are located at a greater distance from the flow guide surface 18 than the guide elements 20. In other words, the guide elements 36, viewed in the longitudinal direction L of the commercial vehicle body 2, are arranged between the additional guide elements 36 and the flow guide surface 18. Therefore, with respect to an airflow LS occurring along the roof 8 during driving, the additional guide elements 36 are positioned upstream of the guide elements 20.

[0086] The additional guide elements 36 are spanned by a further flow-guiding surface 38. The further flow-guiding surface 38 has no inclination, but extends horizontally at the level of the roof 8. The additional guide elements 36 support the further flow-guiding surface 38.

[0087] The number of additional guide elements 36 is less than the number of guide elements 20. In this case, ten additional guide elements 36 and eighteen guide elements 20 are provided.

[0088] As in Fig. 4 The guide elements 20 and the further guide elements 36 can be seen in the area of ​​their ends facing away from the flow guide surface 18, which are rounded or have a respective radius that is directed towards the airflow LS.

[0089] The other guide elements 36 are arranged in pairs.

[0090] The further guide elements 36 are extended and oriented parallel to the longitudinal direction of the commercial vehicle body.

[0091] The other guide elements 36 are located in the roof recess 26.

[0092] The additional guide elements 36 are positioned in the roof recess 26 in such a way that the overall height H of the commercial vehicle body 2 is not increased by the additional guide elements 36.

[0093] The other guiding elements 36 are located on the horizontally extended, flat base surface 30 of the roof recess 26.

[0094] The guide elements 36 sit on the inclined, flat base surface 32 of the roof recess 26.

[0095] The distance a of the guide elements 20 to the flow guide surface 18 is more than 100 mm and less than 300 mm.

[0096] The flow guide surface 18 is inclined relative to the horizontal roof plane 28 or outside, wherein the flow guide surface 18 has an orientation inclined downwards from the roof plane 28.

[0097] The flow guide surface includes an inclination angle greater than or equal to 10° with the horizontal roof plane 28, and includes an inclination angle less than or equal to 40° with the horizontal roof plane 28.

[0098] Fig. Figure 5 shows a rear section of another commercial vehicle body 2' according to the invention in a perspective rear view from above. To avoid repetition, only the differences from the previously described embodiment are discussed, with the same reference numerals assigned to identical features.

[0099] The exemplary embodiment according to Fig. 5 differs from the previously described embodiment in that no roof trough and no guide elements are provided. The embodiment described here is designed according to... Fig. The variant of the commercial vehicle body 2' described in section 5 is therefore characterized by the fact that the flow guide surface 18 is flush with the rear wall 6 and therefore has no rear overhang. Reference sign 2 Commercial vehicle body 2' Commercial vehicle body 4 Wall furnishings 6 Wall equipment 8 Roof 10 cargo space 12 Rear 14 Roof area 18 Flow guide surface 16. Facility 20 guiding elements 22 pairs of guide elements 24 ends 26 Roof recess 28 Roof level 30 Footprint 32 Footprint 34 Inlet area 36 guiding elements 38 Flow guide surface a distance a2 distance a3 angle a4 spacing a5 distance AA cut b1 distance b2 width B width h1 height H Total height l2 length l3 length Length L L1 Total length LS airflow t1 depth U surroundings W vortex QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2024 103 157 A1

[0002]

Claims

[1] Commercial vehicle body, with wall devices (4, 6) and with a roof (8) for delimiting a cargo space (10), wherein a rear end (12) of the commercial vehicle body (2) is assigned a rear-side device (16) for reducing air resistance occurring during driving operation in a roof area (14) of the commercial vehicle body (2), wherein the rear-side device (16) for reducing air resistance occurring during driving operation has at least one flow guide surface (18), characterized by , that the flow guide surface (18) has no rear overhang. [2] Commercial vehicle body according to claim 1, characterized by , that the flow guide surface (18) is essentially flush with a wall element (6) that limits the cargo space (10) at the rear when viewed in the longitudinal direction (L) of the commercial vehicle body (2) or is set back from the wall element (6) that limits the cargo space (10) at the rear. [3] Commercial vehicle body according to one of the preceding claims, characterized by , that a plurality of guide elements (20) are assigned to the rear (12) in the roof area (14), wherein the guide elements (20) are arranged to generate vortices (W) in an airflow (LS) existing along the roof (8) during driving operation, wherein the guide elements (20) are arranged at a distance from the flow guide surface (18) and are distributed along a width (B) of the commercial vehicle body (2). [4] Commercial vehicle body according to claim 2, characterized by , that the guide elements (20) are arranged in pairs, with each pair of guide elements forming a guide element pair (22). [5] Commercial vehicle body according to claim 3 or claim 4, characterized by , that the guide elements (20) of a respective guide element pair (22) have a distance (a2) to each other that narrows in the direction of the flow guide surface (18). [6] Commercial vehicle body according to one of claims 3-5, characterized by , that the guide elements (20) of a respective guide element pair (22) have a V-shaped, symmetrically narrowing distance (a2) to each other. [7] Commercial vehicle body according to one of claims 3 to 6, characterized by , that the guide elements (20) of a respective pair of guide elements (22) have ends (24) facing the flow guide surface (18), wherein these ends (24) facing the flow guide surface (18) have a distance (a2) from each other or are adjacent to each other or are formed integrally together. [8] Commercial vehicle body according to one of claims 3 to 7, characterized by , that the guide elements (20) of each pair of guide elements (22) enclose an angle (a3) ​​greater than or equal to 20 degrees and less than or equal to 40 degrees to each other, in particular an angle of 30 degrees to each other. [9] Commercial vehicle body according to any one of claims 3 to 8, characterized by, that the guide element pairs (22) have an equidistant distance (b1) to each other. [10] Commercial vehicle body according to any one of claims 3 to 9, characterized by , that the guide elements (20) are arranged in a row along the width (B) of the commercial vehicle body (2), in particular that the guide elements have no offset when viewed in the longitudinal direction (L) of the commercial vehicle body (2). [11] Commercial vehicle body according to any one of claims 3 to 10, characterized by , that each guiding element (20) is a vertical fin (20). [12] Commercial vehicle body according to any one of claims 3 to 11, characterized by , that the height (h1) of each guide element (20) decreases in the direction of the flow guide surface (18). [13] Commercial vehicle body according to any one of claims 3 to 12, characterized by, that an end section of a respective guide element (20) facing away from the flow guide surface (18) has a convex contour which transitions into a substantially straight upper surface, in particular a substantially horizontal upper surface of the respective guide element (20). [14] Commercial vehicle body according to any one of claims 3 to 13, characterized by that a number of the guiding elements is greater than or equal to ten and less than or equal to thirty. [15] Commercial vehicle body according to any one of claims 3 to 14, characterized by that the guiding elements (20) are made of or consist of a plastic or the guiding elements (20) are made of or consist of a metallic material. [16] Commercial vehicle body according to any one of claims 3 to 15, characterized by, that the guiding elements (20) are not detachably attached to the roof (8), in particular by a material-bonded connection, such as welding, soldering or gluing. [17] Commercial vehicle body according to any one of claims 3 to 16, characterized by , that each guide element (20) has a length (l2) greater than or equal to 100 mm and less than or equal to 250 mm, and / or each guide element (20) has a height (h1) greater than or equal to 20 mm and less than or equal to 30 mm, in particular a height (h1) of 25 mm. [18] Commercial vehicle body according to any one of claims 3 to 17, characterized by , that the roof (8) has a roof trough (26), wherein the guide elements are located in the roof trough (26). [19] Commercial vehicle body according to claim 18, characterized by , that the roof recess (26) has a width (b2) greater than or equal to 1500 mm and less than or equal to 2400 mm, in particular a width of 2300 mm or 2008 mm and / or the roof recess (26) has a length (l3) greater than or equal to 350 mm and less than or equal to 550 mm, in particular a length of 541 mm and / or the roof recess (26) has a depth (t1) greater than or equal to 20 mm and less than or equal to 30 mm, in particular a depth (t1) of 25 mm. [20] Commercial vehicle body according to claim 18 or claim 19, characterized by , that an outer surface of the roof (8) facing an environment (U) of the commercial vehicle body defines an overall height (H) of the commercial vehicle body, wherein the guide elements are positioned in the roof recess (26) such that the overall height (H) of the commercial vehicle body is not increased by the guide elements. [21] Commercial vehicle body according to one of claims 18-20, characterized by , that the roof recess (26) has a horizontally extended, planar support surface (30) on which the guide elements sit with a respective horizontal, planar support contour. and / or the roof recess (26) has an inclined, planar support surface (32) on which the guide elements sit with a respective inclined, planar support contour and / or the roof recess (26) has a sloping inlet surface (34), with no guide elements on the inlet surface (34). [22] Commercial vehicle body according to any one of claims 3 to 21, characterized by , that the distance of the guide elements to the flow guide surface is more than 100 mm and less than 300 mm, in particular more than 150 mm and less than 200 mm. [23] Commercial vehicle body according to any one of claims 3 to 22, characterized by, that in the roof area (14) in addition to the guide elements (20) a plurality of further guide elements (36) are provided, wherein the further guide elements (36) are arranged at a distance (a2) to the flow guide surface (18) and to the guide elements (20) and are distributed along the width of the commercial vehicle body (2). [24] Commercial vehicle body according to claim 23, characterized by , that the additional guide elements (36) have a greater distance to the flow guide surface (18) than the guide elements (20). [25] Commercial vehicle body according to claim 23 or claim 24, characterized by , that the further guide elements (36) are spanned by a further flow guide surface (38), wherein the further flow guide surface (38) in particular has no inclination, but extends essentially horizontally, in particular extends to the level of the roof (8), in particular that the further guide elements (36) support the further flow guide surface (38). [26] Commercial vehicle body according to one of claims 23 to 25, characterized by , that a number of the further guiding elements (36) is less than a number of the guiding elements (20). [27] Commercial vehicle body according to one of claims 23 to 26, characterized by , that the further guide elements (36) are arranged in pairs and / or the other guiding elements (36) are oriented essentially parallel to the longitudinal direction of the commercial vehicle body. [28] Commercial vehicle body according to one of claims 18 to 21 and according to one of claims 23 to 27, characterized by , that the further guiding elements (36) are located in the roof recess (26). [29] Commercial vehicle body according to claim 20 and claim 28, characterized by , that the additional guide elements (36) are positioned in the roof recess (26) in such a way that the overall height (H) of the commercial vehicle body (2) is not increased by the additional guide elements (36). [30] Commercial vehicle body according to claim 21 and claim 28, characterized by , that the further guiding elements (36) are located on the horizontally extended, flat base surface (30) of the roof recess (26) and that the guiding elements (20) are located on the inclined, planar base (32) of the roof recess (26). [31] Commercial vehicle body according to one of the preceding claims, characterized by , that the flow guide surface (18) is part of a rear portal beam of the commercial vehicle body (2'). [32] Commercial vehicle body according to one of the preceding claims, characterized by , that the flow guide surface (18) is inclined relative to a horizontal roof plane (28), wherein the flow guide surface (18) has an orientation inclined downwards from the roof plane (28). [33] Commercial vehicle body according to one of the preceding claims, characterized by , that that the flow guide surface (18) includes an angle of inclination greater than or equal to 10° with a horizontal roof plane (28), in particular an angle of inclination greater than or equal to 15° with the horizontal plane (28), and further in particular an angle of inclination greater than or equal to 18° with the horizontal plane of the roof (28). and / or that the flow guide surface (18) includes an angle of inclination less than or equal to 40° with the horizontal plane (28), in particular an angle of inclination less than or equal to 30° with the horizontal plane (28), and further in particular an angle of inclination less than or equal to 24° with the horizontal plane (28). [34] Commercial vehicle body according to claim 32 and claim 33, characterized by, that the horizontal plane is the horizontal roof plane (28), in particular that the horizontal roof plane (28) is the outside of the roof (28) facing an environment (U) of the commercial vehicle body (2') and away from the cargo space (10).

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