Motor vehicle with an air deflector

Abstract

Motor vehicle (10) with a rear-side body structure (12) and with an air guiding device (11) which has a first air guiding element (14) and a second air guiding element (15), wherein in a rest position of the air guiding device (11), the first air guiding element (14) closes a receiving space (16) in a rear-side body structure (12), in which the second air guiding element (15) is arranged in the rest position of the air guiding device (11), at the top as seen in the vertical direction of the motor vehicle, wherein for transferring the air guiding device (11) from the rest position to a first working position, the first air guiding element (14) is displaceable rearward in the longitudinal direction of the motor vehicle and the second air guiding element (15) is displaceable upward in the vertical direction of the motor vehicle, such thatthat the second air guide element (15) at least partially closes the receiving space (16) in the rear body structure at the top and the first air guide element (14) is arranged in the longitudinal direction of the motor vehicle behind the second air guide element (15) to extend the latter, and wherein in order to transfer the air guide device (11) from the first working position to a second working position, the second air guide element (15) can be displaced further upwards in the vertical direction of the motor vehicle.

Description

The invention relates to a motor vehicle having an air guiding device according to the preamble of claim 1.DE 10 2016 111 429 A1 discloses an air guiding device of a motor vehicle, wherein the air guiding device is arranged in a rear region of the motor vehicle. The air guiding device has a first air guiding element embodied as a primary wing and a second air guiding element embodied as a secondary wing. In a rest position, the second air guiding element is placed in a receiving space of the rear body structure, wherein the first air guiding element then closes the receiving space at the top, as seen in the vertical direction of the motor vehicle. In an operating position, the first and second air guiding elements are both displaced upwards as viewed in the vertical direction of the motor vehicle, wherein the second air guiding element then closes the receiving space in the rear body structure and the first air guiding element is arranged above the second air guiding element.DE 10 2013 106 400 A1, DE 10 2011 015 009 A1, DE 2006 014 259 A1,DE 10 2023 102 775 A1 and DE 10 2013 112 507 A1 disclose further prior art.There is a need for a motor vehicle having an air guiding device which makes it possible to advantageously influence the air flow at the rear-side body structure in different working positions.The object of the invention is to provide a motor vehicle having a corresponding air guiding device.This object is achieved by a motor vehicle according to claim 1.According to the invention, in order to transfer the air guiding device from the rest position into a first working position, the first air guiding element can be displaced rearwards in the longitudinal direction of the motor vehicle and the second air guiding element can be displaced upwards in the vertical direction of the motor vehicle in such a way that the second air guiding element at least partially closes the receiving space in the rear body structure at the top and the first air guiding element is arranged behind the second air guiding element in the longitudinal direction of the motor vehicle with extension of the second air guiding element. In order to transfer the air guiding device from the first working position into a second working position, the second air guiding element can be displaced further upwards in the vertical direction of the motor vehicle.In the first working position, the first air guiding element is displaced rearward as viewed in the longitudinal direction of the motor vehicle, wherein the second air guiding element is displaced upward in the vertical direction of the motor vehicle in the first working position and at least partially closes or covers the receiving space in the rear-side body structure.In the second working position, the second air guiding element is displaced even further upwards, as seen in the vertical direction of the motor vehicle, and the first air guiding element can either remain in its position of the first working position or be displaced again forwards, as seen in the longitudinal direction of the motor vehicle.Both working positions of the air guiding device allow an advantageous influencing of the air flow at the rear body structure while providing different properties. Thus, the efficiency of the motor vehicle can be increased in particular via the first working position of the air guiding device. Via the second working position of the air guiding device, the motor vehicle can be operated with higher performance, in particular on a track section.According to a first alternative, for transferring the air guiding device from the first working position into the second working position, the first air guiding element remains in its position of the first working position. According to a second alternative, for transferring the air guiding device from the first working position into the second working position, the first air guiding element can be displaced forwards under the second air guiding element in the longitudinal direction of the motor vehicle, so that the same at least partially closes the receiving space in the rear body structure at the top. The first alternative is structurally simpler than the second alternative.Preferably, the first working position of the air guiding device is an efficiency position in which a cwvalue of the motor vehicle is reduced compared to the rest position of the air guiding device. The second working position of the air guiding device is preferably a performance position in which an output force acting on the motor vehicle is increased compared to the rest position of the air guiding device. The efficiency can thus be advantageously increased in the first working position and the performance of the motor vehicle in the second working position.Preferred developments of the invention are evident from the dependent claims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawings, without being restricted thereto. The following shows: FIG. 1 shows a cross section through a rear body structure of a motor vehicle according to the invention in the region of an air guiding device in a rest position thereof, FIG. 2 is a rear view of FIG. 1, FIG. 3 shows the cross section of FIG. 1 in a first working position of the air guiding device, FIG. 4 is a perspective view of FIG. 3 , FIG. 5 shows the cross section of FIG. 1 in a second working position of the air guiding device according to a first alternative, FIG. 6 is a perspective view of FIG. 5, FIG. 7 shows the cross section of FIG. 1 in a second working position of the air guiding device according to a second alternative, FIG. 8 is a perspective view of FIG. 7.FIGS. 1 and 2 show different views of a motor vehicle 10 according to the invention in the region of an air guiding device 11. the air guiding device 11 is arranged in the region of a rear body structure 12 of the motor vehicle 10, preferably behind a rear window 13 thereof, as viewed in the longitudinal direction of the motor vehicle 10.The air guiding device 10 has a first air guiding element 14 and a second air guiding element 15. In the rest position of the air guiding device 10 shown in FIGS. 1, 2, the first air guiding element 14 closes a receiving space 16 of the rear body structure 12, in which the second air guiding element 15 is arranged in the rest position of the air guiding device 10, at the top, as seen in the vertical direction of the motor vehicle.The air guiding device 10 can be displaced from the rest position shown in FIGS. 1, 2 into different working positions, namely into a first working position shown in FIGS. 3, 4 and into a second working position, wherein FIGS. 5, 6 and 7, 8 show different embodiments of the second working position.In order to transfer the air guiding device 10 from the rest position shown in FIGS. 1, 2 into the first working position shown in FIGS. 3, 4, the first air guiding element 14 is displaced rearward as viewed in the longitudinal direction of the motor vehicle and the second air guiding element 15 is displaced upward out of the receiving space 16 as viewed in the vertical direction of the motor vehicle, namely in such a way that the second air guiding element 15 at least partially closes the receiving space 16 in the rear body structure 12 at the top.In the first working position shown in FIGS. 3, 4, the first air guiding element 14 is arranged behind the second air guiding element 15, as viewed in the longitudinal direction of the motor vehicle, with the extension of the second air guiding element 15. Upper air guiding surfaces of the two air guiding elements 14, 15 merge flush into one another in the first working position shown in FIGS. 3, 4.In the first working position of the air guiding device 10, as can best be seen from FIG. 3, the two air guiding elements 14, 15 together form a flush air guiding surface, so that a break-off point P of the air flow at the air guiding device 11 can be clearly displaced rearward in the vehicle longitudinal direction compared to the rest position of FIGS. 1, 2, in particular by more than 200 mm.The first working position 10 of FIGS. 3, 4 is in particular an efficiency position in which a cw value of the motor vehicle 10 can be reduced compared to the rest position of the air guiding device 11 in order to save fuel or, in the case of an electric vehicle, electrical energy which is required for the drive.In addition to the first working position of the air guiding device 11 shown in FIGS. 3, 4, the air guiding device 11 can be displaced into a second working position, wherein FIGS. 5, 6 show a first characteristic of the second working position of the air guiding device 11 and FIGS. 7, 8 show a second characteristic of the second working position of the air guiding device 11.Common to the second working positions of the air guiding device 11 of FIGS. 5, 6 and 7, 8 is that, in order to transfer the air guiding device 11 from the first working position of FIGS. 3, 4 into the second working position, the second air guiding element 15 is displaced further upward, as seen in the vertical direction of the motor vehicle 10, in comparison to the first working position of the air guiding device 11.In the first variant of the second working position of the air guiding device 11 according to FIGS. 5 and 6, the first air guiding element 14 remains in its position of the first working position of FIGS. 3, 4. In the second variant of the second working position of the air guiding device 11 according to FIGS. 7, 8, the first air guiding element 14 is displaced forwards under the second air guiding element 15, as seen in the longitudinal direction of the motor vehicle, with the first air guiding element 14 at least partially closing the receiving space 16 at the top in the rear body structure 12.For the displacement of the first air guiding element 14 from the rest position shown in FIGS. 1, 2 into the first working position shown in FIGS. 3, 4 and for the displacement thereof starting from the first working position shown in FIGS. 3, 4 into the working position shown in FIGS. 7, 8, the first air guiding element 14 can be displaced either translationally along a linear movement or rotationally about an axis extending in the transverse direction of the motor vehicle via a folding movement. The displacement of the second air guiding element 15 starting from the rest position shown in FIGS. 1, 2 into the working positions shown in FIGS. 3 to 8 takes place via a folding movement about an axis extending in the transverse direction of the motor vehicle. While the efficiency of the motor vehicle can be increased via the first working position of FIGS. 3, 4, the performance of the motor vehicle 10 can be increased via the second working position of FIGS. 5, 6 or 7, 8, namely via an increase in the output force acting on the motor vehicle in the rear region.As can best be seen from a comparison of FIGS. 4 and 8, when the first air guiding element 14 is displaced from the first working position into the second working position of FIGS. 7, 8, lateral sections 14 aof the first air guiding element 14 can be folded over about axes 17 extending in the longitudinal direction of the motor vehicle, in order to reduce the width of the first air guiding element 14 in the transverse direction of the motor vehicle, so that the same can be displaced past a not-shown kinematic mechanism for the second air guiding element 15 into the position or position shown in FIGS. 7, 8.For each air guiding element 14, 15, a separate kinematic mechanism and a separate drive are preferably provided.

Claims

Motor vehicle (10) having a rear-side body structure (12) and having an air guiding device (11) which is arranged in the region of the rear-side body structure (12), wherein the air guiding device (11) has a first air guiding element (14) and a second air guiding element (15), wherein, in a rest position of the air guiding device (11), the first air guiding element (14) closes a receiving space (16) in a rear-side body structure (12), in which, in the rest position of the air guiding device (11), the second air guiding element (15) is arranged, at the top, as seen in the vertical direction of the motor vehicle (10), characterized in that, in order to transfer the air guiding device (11) from the rest position into a first working position, the first air guiding element (14) is displaceable towards the rear in the longitudinal direction of the motor vehicle and the second air guiding element (15) is displaceable towards the top in the vertical direction of the motor vehicle, in such a way, the second air guiding element (15) at least partially closes the receiving space (16) in the rear body structure (12) at the top and the first air guiding element (14) is arranged behind the second air guiding element (15) in the longitudinal direction of the motor vehicle (10) to extend the latter, and the second air guiding element (15) can be displaced further upward in the vertical direction of the motor vehicle (10) in order to transfer the air guiding device (11) from the first working position into a second working position.Motor vehicle (10) according to Claim 1, characterized in that, in order to transfer the air guiding device (11) from the rest position into a first working position, the first air guiding element (14) can be displaced along a linear movement or folding movement and the second air guiding element (15) can be displaced along a folding movement.Motor vehicle (10) according to Claim 1 or 2, characterized in that, in order to transfer the air guiding device (11) from the first working position into the second working position, the first air guiding element (14) remains in its position of the first working position.Motor vehicle (10) according to Claim 2 or 3, characterized in that, in order to transfer the air guiding device (11) from the first working position into the second working position, the second air guiding element (15) can be displaced along a folding movement.Motor vehicle (10) according to Claim 1 or 2, characterized in that, in order to transfer the air guiding device (11) from the first working position into the second working position, the first air guiding element (14) can be displaced forwards under the second air guiding element (15) in the longitudinal direction of the motor vehicle, with the result that the latter partially closes the receiving space (16) in the rear-side body structure (12) at the top.Motor vehicle (10) according to Claim 5, characterized in that, in order to transfer the air guiding device (11) from the first working position into the second working position, the second air guiding element (15) can be displaced along a folding movement, and in that the first air guiding element (4) can be displaced along a linear movement or folding movement.Motor vehicle (10) according to Claim 5 or 6, characterized in that, in order to transfer the air guiding device (11) from the first working position into the second working position, lateral sections (14a) of the first air guiding element (14) can be folded over before or during the displacement of the first air guiding element (14).Motor vehicle (10) according to one of Claims 1 to 7, characterized in that the first working position is an efficiency position in which a cw value of the motor vehicle is reduced.Motor vehicle (10) according to one of Claims 1 to 8, characterized in that the second working position is a performance position in which an output force acting on the motor vehicle is increased.

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