DE102018213770A1 - Rear air guiding device for a vehicle - Google Patents

Abstract

The invention relates to a rear air guide device (20) for a vehicle, with at least one first air guide element (21), an actuating device moving the at least one first air guide element (21) between a first end position and a second end position, an upper side (21.2) of the In the first end position, at least one first air guide element (21) forms a first inflow surface (21.1). According to the invention, the at least one first air guide element (21) in the first end position covers a second inflow surface (22.2) of at least one second air guide element (22) and releases the second inflow surface (22.2) of the at least one second air guide element (22) in the second end position ,

Description

The invention relates to a rear-side air guiding device for a vehicle according to the preamble of patent claim 1.

Add-on parts for vehicles, in particular air guiding elements or spoilers, which improve the flow around the vehicle or the aerodynamics of the vehicle, are known in numerous variations. Corresponding air guiding devices for vehicles with at least one air guiding element are also known, an actuating device moving the at least one air guiding element between a first end position and a second end position. In a final position, the so-called dead water area or a negative pressure in the dead water area and thereby an air resistance of the vehicle can be reduced by the air guiding device.

From the EP 0 110 232 B1 a generic air guiding device with a movably mounted air guiding element is known. In a first end position, the air guiding element bears against a vehicle element. In the first end position, an air straw is passed over a first inflow surface of the air guide element, which is arranged on an upper side of the air guide element. In a second end position, the air guiding element is arranged at a predetermined distance from the vehicle element. The space between the vehicle element and the air control element forms a channel in which the air flow flows. The air flow is directed over a second inflow surface, which is arranged on an underside of the air guiding element.

From the DE 10 2008 036 283 A1 a rear-side air guiding device is known, which is arranged on a rear edge of the roof on a tailgate provided with a rear window. An upper inflow surface of the air guiding device extends in the extension of the upstream roof top and the air guiding device projects beyond an upper edge region of the rear window.

The invention is based on the object of providing a rear-side air guiding device for a vehicle which improves aerodynamics of the vehicle.

This object is achieved by a rear-side air guiding device with the features of patent claim 1. Advantageous refinements with expedient developments of the invention are specified in the dependent claims.

In order to provide a rear-side air guiding device for a vehicle, which improves aerodynamics of the vehicle, at least one movably mounted first air guiding element in a first end position covers a second inflow surface of at least one second air guiding element and gives the second inflow surface of the at least one second air guiding element in the second end position free.

In the following, the at least one first air guiding element is understood to mean a design screen extending in the vehicle transverse direction. The design panel is designed to be visually appealing and can advantageously continue a line of the vehicle, for example a roof line. The aerodynamic effect of the first inflow surface of the at least one first air guiding element is less relevant than the optical effect achieved.

In the following, the at least one second air guide element is understood to mean a fixed functional unit running in the vehicle transverse direction, which corresponds to an aerodynamically optimized air guide element or spoiler. This functional unit can advantageously shift the rear edge of the air flow to the rear and / or downwards, whereby a dead water area behind the vehicle can be reduced in an advantageous manner.

The air guiding device according to the invention can be used in particular on a sport utility vehicle (SUV) and on motor vehicles with a similar silhouette, so-called full-tail vehicles or hatchback vehicles. Compared to the size of the vehicle, these vehicles have a relatively large rear area and a raised tear-off edge on the roof line.

Here, the at least one first air guiding element and the at least one second air guiding element in the first end position can advantageously provide a rear view through a rear window. In addition, the at least one first air guide element can advantageously improve an optical appearance of the vehicle by covering the at least one second air guide element. In the second end position, an extension of the roof line is changed by the at least one exposed second air guide element, as a result of which the at least one second air guide element can improve the aerodynamics of the vehicle, in particular at higher speeds, and thereby reduce fuel consumption and / or increase the range of the vehicle. Here, the at least one second air guide element can be arranged at least partially below the at least one first air guide element.

In an advantageous embodiment of the air guiding device according to the invention the second inflow surface of the at least one second air guiding element can be aerodynamically adapted to higher speeds above 80 km / h. For example, the second inflow surface of the at least one second air guide element can have a steeper inclination than the first inflow surface of the at least one first air guide element. Due to the steeper inclination, a contour of the second inflow surface falls more steeply in the vertical direction of the vehicle, as a result of which an air flow can advantageously be directed downwards in the direction of the rear window or in the direction of the roadway. The contour can be adjusted so that the air flow is directed downwards at higher vehicle speeds in order to reduce the dead water area behind the vehicle.

In a further advantageous embodiment of the air guiding device according to the invention, the at least one first air guiding element in the first end position can rest at least partially on the at least one second air guiding element. Because the at least one first air guiding element in the first end position lies at least partially against the at least one second air guiding element and can be adapted to a vehicle line, the external appearance of the vehicle and a rear view can be slightly or not at all negatively influenced by the at least one first Air guide element can be influenced in the first end position. In the second end position, the at least one first air guide element can advantageously be pivoted away from the at least one second air guide element, for example, in order to expose the second inflow surface and to improve the flow around the vehicle in an advantageous manner.

In a further advantageous embodiment of the air guiding device according to the invention, the adjusting device can move the at least one first air guiding element depending on the vehicle speed between the first end position and the second end position. In this case, the adjusting device can transfer the at least one first air guiding element, for example when a first speed threshold value is exceeded, from the first end position to the second end position. If a second speed threshold is undershot, the actuating device can transfer the at least one first air guiding element from the second end position into the first end position. Here, the first threshold value can be selected, for example, in the range from 60 to 100 km / h larger than the second threshold value. The adjusting device can have a drive and at least one hinge. The hinge can correspond to a multi-joint hinge. In an advantageous manner, the at least one first air guide element can be easily moved between the two end positions via a multi-joint hinge.

The threshold values can ensure that at high speeds, at which air resistance and unfavorable air flows around the vehicle have an effect, the at least one second air guiding element must be released in order to positively influence the air flow around the vehicle in the rear area.

In a further advantageous embodiment of the air guiding device according to the invention, the at least one first air guiding element in the second end position can have a predetermined distance from the at least one second air guiding element. In addition, in the second end position, an underside of the at least one first air guide element can be aligned parallel to the second inflow surface of the at least one second air guide element. The at least one first air guiding element can advantageously be flowed through by the distance. Due to the underflow of the at least one first air guide element and the parallel orientation of the underside of the at least one first air guide element to the second inflow surface, the at least one first air guide element can support the at least one second air guide element in guiding the air flow.

In a further advantageous embodiment of the air guiding device according to the invention, the at least one first air guiding element can have a deflecting area at a rear end area, which redirects an air flow in the direction of the rear window. This deflection area can further support the second inflow surface of the at least one second air guiding element in an advantageous manner in order to further reduce air resistance on the vehicle.

In a further advantageous embodiment of the air guide device according to the invention, the at least one first air guide element and the at least one second air guide element can be arranged on an upper tailgate cross member and extend a roof line. Here, the at least one first air guide element and the at least one second air guide element can form a rear roof edge. In this case, the at least one first air guiding element in the first end position can lengthen a trailing edge of the air flow in the vehicle longitudinal direction in order to positively influence an air flow. In the second end position, the second inflow surface of the at least one second air guiding element can extend a tear-off edge of the air flow downwards in the vehicle vertical direction in order to positively influence an air flow.

In a further advantageous embodiment of the air guiding device according to the invention, the first inflow surface of the at least one first air guiding element can be arranged in alignment in the first end position with a vehicle roof. Due to the aligned arrangement, a visually appealing continuous line of the roof in the first End position are created. In addition, the formation of aerodynamically unfavorable turbulences in the rear area can advantageously be partially or completely prevented by such an aligned arrangement. Here, the tear-off edge of the air flow guided over a roof can be shifted back in the first end position.

The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the combination indicated in each case, but also in other combinations or on their own, without the scope of Leaving invention. Embodiments are thus also to be regarded and encompassed by the invention, which are not explicitly shown or explained in the figures, but which emerge from the explanations explained and can be generated by separate combinations of features.

• 1 eine schematische Schnittdarstellung eines oberen Abschnitts eines Fahrzeughecks mit einem Ausführungsbeispiel der erfindungsgemäßen Luftleitvorrichtung mit einem ersten Luftleitelement in einer ersten Endstellung;
• 2 die schematische Schnittdarstellung des Ausschnitts des Fahrzeughecks aus 1 mit dem ersten Luftleitelement in einer zweiten Endstellung; und
• 3 eine perspektivische Ansicht des oberen Abschnitts des Fahrzeughecks mit dem ersten Luftleitelement in der zweiten Endstellung.

An embodiment of the invention is shown in the drawing and is explained in more detail in the following description. In the drawing, the same reference numerals designate components or elements that perform the same or analog functions. Here show:

• 1 is a schematic sectional view of an upper portion of a vehicle rear with an embodiment of the air guide device according to the invention with a first air guide element in a first end position;
• 2 the schematic sectional view of the detail of the rear of the vehicle 1 with the first air guide element in a second end position; and
• 3 a perspective view of the upper portion of the rear of the vehicle with the first air guide in the second end position.

How from 1 to 3 can be seen, includes a rear-side air guide 20 for a vehicle at least a first air guiding element 21 , wherein an adjusting device, not shown, the at least one first air guide 21 moved between a first end position and a second end position. A top 21.2 of the at least one first air guiding element 21 forms a first inflow surface in the first end position 21.1 out.

According to the invention, the at least one first air guiding element covers 21 a second inflow surface in the first end position 22.2 of at least one second air guiding element 22 and gives the second inflow surface 22.2 free in the second end position.

How from 1 to 3 can also be seen, includes the rear of the vehicle 10 a roof 11 with a top 11.4 , being at the top 11.4 an air flow is conducted. The rear of the vehicle also includes 10 a tailgate 14 which is a rear window 15 includes. The rear window 15 is by two side frame elements running in the vehicle vertical direction z 16 limited laterally. The rear of the vehicle also includes 10 the air guiding device according to the invention 20 , An upper margin 15.2 the rear window 15 is from the first air guide 21 and the second air guide 22 superimposed.

How from 1 to 3 is also apparent, the air guide device according to the invention 20 in the illustrated embodiment on a rear edge of the roof 18 arranged of the vehicle or the first air guide 21 and the second air guide 22 form an extension of the rear edge of the roof in the first end position 18 out. Here, an upper cross member 17 the tailgate 14 the rear of the vehicle 10 the second air guide 22 and the first air guide 21 on, the first air guide 21 in the first end position the second air guide 22 covers. In an alternative embodiment, not shown, of the air guiding device according to the invention 20 can the air baffle 20 more than a first air guiding element 21 and / or more than a second air guiding element 22 exhibit.

How from 1 can be seen further, in the first end position the roof line, which slopes slightly in the vehicle vertical direction z 11.2 through the first inflow surface 21.1 of the first air guiding element designed as a design panel 21 further extended to the flow in the vehicle vertical direction z down and in the vehicle longitudinal direction x to redirect backwards. In the illustrated embodiment, the first air guide element is located 21 in the first end position on the second air guide 22 on. In an alternative embodiment, not shown, the first air guiding element 21 the second air guide 22 or the second inflow surface 22.2 of the second air guide 22 cover without the two air control elements 21 . 22 touch. In addition, the first inflow surface 21.1 of the first air guide 21 in the first end position, aligned with the vehicle roof 11 arranged.

How from 1 to 3 can also be seen is the fixed second air guide 22 below the first air guide 21 arranged. Here is the second inflow surface 22.2 of the at least one second air guiding element 22 aerodynamically adapted to higher vehicle speeds over 80km / h. In the exemplary embodiment shown, the second inflow surface has 22.2 of the second air guide 22 a steeper slope than the first face 21.1 of the first air guide 21 on. The second inflow surface released in the second end position 22.2 falls more in the vertical direction of the vehicle z and follows the roof line 11.2 no more. Due to the steeper drop of the second inflow surface 22.2 the flow continues in the vehicle vertical direction z deflected downwards and a dead water area behind the vehicle and thereby reduced air resistance of the vehicle. The first air control element 21 is in the second end position in the air flow so that it causes little or no interaction with the air flow. In addition, the first air guiding element obstructs 21 in the second end position a view of the driver through the rear window 15 only marginally.

How from 2 and 3 can also be seen, the first air guide element 21 in the second end position a predetermined distance from the second air guide 22 on. In the illustrated embodiment, an underside is in the second end position 21.6 of the first air guide 21 parallel to the second inflow surface 22.2 of the at least one second air guiding element 22 is aligned. In an alternative embodiment, not shown, the underside 21.6 flatter than the second inflow surface 22.2 be aligned. Alternatively or additionally, the first air guide element 21 be steeper or flatter in the second end position than in the first end position. By the distance and the orientation of the first air guide 21 to the second air control element 22 , becomes the first air control element 21 flows in the second end position, the bottom 21.6 of the first air guide 21 the second inflow surface 22.2 can assist in directing the air flow. Between the bottom 21.6 and the second inflow surface 22.2 there is a gap 24 in which the airflow flows. The guidance of the air flow is essentially from the second inflow surface 22.2 accepted.

How from 2 and 3 can also be seen, the at least one first air guide element 21 a deflection area at a rear end area 21.4 on, which in the second end position the air flow towards the rear window 15 redirects. The first air guiding element supports this 21 in the second end position the second air guide 22 further. In the first end position, the deflection area 21.4 to cover the second air guiding element 22 contribute.

The adjusting device, not shown, moves the first air guide element 21 depending on the vehicle speed between the first end position and the second end position. For the adjustment of the first air control element 21 At least one vehicle speed threshold value can be specified in the range from 60 to 100 km / h, and if the vehicle speed threshold value is exceeded, the actuating device controls the first air guiding element 21 transferred from the first end position to the second end position. If the vehicle speed threshold is undershot, the actuating device transfers the first air guiding element 21 from the second end position to the first end position. Alternatively, two threshold values in the range from 60 to 100 km / h can be specified, the actuating device controlling the first air guiding elements when a first vehicle speed threshold value is exceeded 21 transferred from the first end position to the second end position. If a second vehicle speed threshold is undershot, the actuating device transfers the first air guiding element 21 from the second end position to the first end position. The first threshold is larger than the second threshold. As a result, the vehicle has an attractive appearance at slow speeds at which it can be perceived by people. At higher speeds, at which air resistance affects fuel consumption, the second air baffle is 22.2 release, which deflects the air flow downwards and thereby reduces the air resistance of the vehicle.

The actuating device, not shown, has a drive and at least one hinge. The at least one hinge can, for example, correspond to a multi-joint hinge. By pivoting levers of the multi-joint hinge, the first air guide element 21 moved between the first end position and the second end position. Here is the first air guide 21 in the second end position of the second air guiding element 22 lifted.

LIST OF REFERENCE NUMBERS

10

vehicle rear

11

top, roof

11.2

roofline

11.4

top

14

tailgate

15

rear window

15.2

upper edge area (is overlaid by the air guiding element)

16

Side frame members

17

upper cross frame element

18

Roof rear edge

20

spoiler device

21

first air guiding element

21.1

first inflow surface

21.2

top

21.4

deflection

21.6

bottom

22

second air guide

22.2

second upper inflow surface

24

gap

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 0110232 B1 [0003]
• DE 102008036283 A1 [0004]

Claims (10)

Rear-side air guiding device (20) for a vehicle, with at least one first air guiding element (21), an actuating device moving the at least one first air guiding element (21) between a first end position and a second end position, an upper side (21.2) of the at least one first air guiding element (21) forms a first inflow surface (21.1) in the first end position, characterized in that the at least one first air guide element (21) in the first end position covers a second inflow surface (22.2) of at least one second air guide element (22) and in the second Releases end position. Air guiding device after Claim 1 , characterized in that the second inflow surface (22.2) of the at least one second air guide element (22) is aerodynamically adapted to higher vehicle speeds above 80 km / h. Air guiding device after Claim 1 or 2 , characterized in that the second inflow surface (22.2) of the at least one second air guide element (22) has a steeper inclination than the first inflow surface (21.1) of the at least one first air guide element (21). Air guiding device according to one of the Claims 1 to 3 , characterized in that the at least one first air guide element (21) in the first end position at least partially abuts the at least one second air guide element (22). Air guiding device according to one of the Claims 1 to 4 , characterized in that the adjusting device moves the at least one first air guide element (21) depending on the vehicle speed between the first end position and the second end position. Air guiding device according to one of the Claims 1 to 5 , characterized in that the at least one first air guide element (21) in the second end position has a predetermined distance from the at least one second air guide element (22). Air guiding device according to one of the Claims 1 to 6 , characterized in that in the second end position an underside (21.6) of the at least one first air guide element (21) is aligned parallel to the second inflow surface (22.2) of the at least one second air guide element (22). Air guiding device according to one of the Claims 1 to 7 , characterized in that the at least one first air guide element (21) has a deflection area (21.4) at a rear end area, which redirects an air flow in the direction of the rear window (15). Air guiding device according to one of the Claims 1 to 8th , characterized in that the at least one first air guide element (21) and the at least one second air guide element (22) are arranged on an upper tailgate cross member (17) and extend a roof line (11.2). Air guiding device according to one of the Claims 1 to 9 , characterized in that the first inflow surface (21.1) of the at least one first air guide element (21) in the first end position is aligned with a vehicle roof (11).

Images