DE102021116049A1 - Air guiding device for a front wheel housing of a motor vehicle - Google Patents

Abstract

The invention relates to an air guiding device (1,2) for a front wheel housing (3,4) of a motor vehicle (5), having at least the following components: - a guiding surface (6,7) with an outside (8) and with an inside (9 - a fastening device (10) for fixing the air guiding device (1,2) on a motor vehicle (5) in front of its front wheel housing (3,4); and - a joint (11) between the guide surface (6,7) and the fastening device (10), so that the guide surface (6,7) can be moved relative to the fastening device (10). The air guiding device (1) is primarily characterized in that a braking position, a high-speed position and a neutral position can be assumed from the guiding surface (6,7) by moving the joint (11). favorable aerodynamic profile can be generated.

Description

The invention relates to an air guiding device for a front wheel housing of a motor vehicle, and to a motor vehicle with such an air guiding device.

Air guiding devices are known from the prior art, which can be aligned differently in a motor vehicle depending on a driving condition in order to adapt the respectively desired aerodynamic forces. For example, air guiding devices are provided on the front wheel housing of a motor vehicle, for example so-called side flaps, with which the ram flow deflected sideways from the front of the motor vehicle can be steered around the front wheel housing or into the front wheel housing. The purpose of such a sideflap is to reduce a vacuum created by the rotation of the wheel in the front wheel arch by introducing the flow into the front wheel arch (for less rolling resistance) or by redirecting it around the front wheel arch (for better lateral support).

Proceeding from this, the object of the present invention is to at least partially overcome the disadvantages known from the prior art. The features according to the invention result from the independent claims, for which advantageous configurations are shown in the dependent claims. The features of the claims can be combined in any technically meaningful way, whereby the explanations from the following description and features from the figures can also be used for this purpose, which include additional configurations of the invention.

• - eine Leitfläche mit einer Außenseite und mit einer Innenseite;
• - eine Befestigungseinrichtung zum Fixieren der Luftleitvorrichtung an einem Kraftfahrzeug vor dessen Vorderradkasten; und
• - ein Gelenk zwischen der Leitfläche und der Befestigungseinrichtung, sodass die Leitfläche relativ zu der Befestigungseinrichtung bewegbar ist.

The invention relates to an air guiding device for a front wheel housing of a motor vehicle, having at least the following components:

• - a guide surface with an outside and with an inside;
• - A fastening device for fixing the air guiding device on a motor vehicle in front of its front wheel housing; and
• - a joint between the guide surface and the attachment device, so that the guide surface is movable relative to the attachment device.

The air guiding device is primarily characterized in that a braking position, a high-speed position and a neutral position can be assumed by the guide surface by moving the joint.

In the following, reference is made to the vehicle longitudinal direction, vehicle transverse direction and vehicle vertical direction if the forward, outward, left or right and corresponding terms are used without explicitly indicating otherwise. Unless explicitly stated otherwise, ordinal numbers used in the description above and below only serve to clearly distinguish them and do not reflect any order or ranking of the components referred to. An ordinal number greater than one does not mean that another such component must necessarily be present.

Such an air guiding device for a front wheel housing of a motor vehicle is proposed here, which is also referred to as a side flap. The air guiding device can be mounted on a motor vehicle in the forward direction of travel in front of the front wheel housing of the motor vehicle. In one embodiment, the air guiding device forms the only flow limitation for the corresponding front wheel in this area, ie part of the housing of the front wheel housing for the corresponding front wheel. The guide surface can be attached to a motor vehicle by means of a joint via a fastening device, the fastening device preferably being a component of the front wheel housing and/or the front apron of the motor vehicle and/or part of a supporting structure of a chassis of the motor vehicle. The joint is, for example, a lever joint and/or toggle joint and allows the guide surface to be pivoted relative to the fastening device; preferably, a displacement of the guide surface relative to the fastening device is also possible or alternatively.

At least three positions can be taken with the air guiding device proposed here, namely the braking position, the high-speed position and the neutral position.

In the braking position, the effect is that a cd value [coefficient of drag] of the motor vehicle is increased, so that deceleration of the motor vehicle is assisted with this braking position. Alternatively or additionally, the generation of a negative pressure from the front wheel of the corresponding front wheel housing is impaired as little as possible, preferably unimpaired, by the driving-related flow onto the air guiding device by means of the braking position.

In the high-speed setting, the drag coefficient of the air-guiding device or of the motor vehicle is as low as possible by means of the air-guiding device in this area and its zone of influence. For example, the air guide with its outside and its inside aligned (roughly) parallel to the forward direction of travel. Alternatively or additionally, in the high-speed position, air can flow into the front wheel housing, so that a negative pressure generated by the rotation of the corresponding front wheel is reduced by the inflowing air and the forces opposing the propulsion of the motor vehicle are thus reduced.

Furthermore, it is proposed here that a neutral position can be assumed, which can also be referred to as an efficiency position and/or as a cruise position. The neutral position is between the alignment of the braking position and the high speed position and/or causes a drag value between the braking position and the high speed position. In the neutral position, a relatively low drag coefficient and, at the same time, good cornering force for the corresponding front wheel in the front wheel housing should be generated. In one embodiment, flow through a cooler is also supported in the neutral position. Such a cooler is, for example, a heat exchanger for a traction battery or an internal combustion engine or other power components of the motor vehicle that generate waste heat.

In one embodiment, the air guiding device also includes an actuating device, for example an electric actuator or a fluidic (ie pneumatic or hydraulic) slave device for moving the air guiding device. Alternatively, the adjusting device is an external component. The adjusting device is connected directly to the guide surface or to the joint, so that the guide surface can be transferred at least into the three positions mentioned by means of the adjusting device. In one embodiment, the adjusting device itself can be latched, in another embodiment the joint can be latched in at least the three positions. Alternatively, the adjusting device is designed to be self-locking, so that (for example any) position can be maintained in an energy-neutral or low-energy manner.

In a particularly preferred embodiment, the guide surface is designed in such a way or the outside and the inside are shaped relative to one another in such a way that the guide surface can be moved from one position to another with little energy, for example by means of corresponding inflow surfaces acting as counter-levers on both sides of the respective pivot point. The outside and the inside are preferably aligned in such a way that the surface normals point in the transverse direction of the vehicle. In another embodiment, the outside and/or the inside have surface portions whose surface normals are slightly inclined to the vehicle transverse direction, for example less than 15° [fifteen degrees of 360°], preferably less than 5°.

The joint is preferably connected to the inside of the guide surface and the inside preferably points inwards in all positions with a vector component of the surface normal (i.e. in the longitudinal direction of the vehicle or in the transverse direction of the vehicle towards the center of the vehicle).

It is also proposed in an advantageous embodiment of the air guiding device that the joint has two joint axes, the joint axes preferably being aligned along the vertical direction of the vehicle.

It is proposed here that the joint has two joint axes, so that the guide surface can not only be pivoted about a single joint axis, but can also be moved backwards about one or more theoretical joint axes, for example a front edge of the guide surface in the longitudinal direction of the vehicle, while a rear edge can be moved forwards and at the same time a region between the edges of the guide surface can be moved forwards or backwards. In one embodiment, one of the hinge axes is realized via a sliding connection. In an advantageous embodiment, two physical joint axes are provided, which are aligned (approximately) vertically in the vehicle, preferably aligned parallel to one another. For example, two connection points for the joint are formed on the guide surface, preferably on the inside, with a lever to the fastening device being formed from each of the connection points and each of the levers being movable independently of one another. A corresponding adjusting device is connected to the guide surface, preferably the inside, and/or a lever of the joint or both levers of the joint and on the vehicle side, for example to the fastening device.

It is also proposed in an advantageous embodiment of the air guiding device that in the installed state in the braking position the outside is directed forwards in the longitudinal direction of the vehicle.

It is proposed here that the surface normal of the outside or the main part of the outside is oriented forwards in the longitudinal direction of the vehicle, so that an inflow from the front and from obliquely sideways is deflected outwards from the outside in the transverse direction of the vehicle (i.e. to the left or to the right). will. In an advantageous embodiment, the front wheel housing is then closed off by the air guiding device in such a way that only a small or negligible proportion of the inflow into the front wheel box can penetrate. In one embodiment, in which the inside is aligned (approximately) parallel to the outside, the inside of the guide surface or its surface normal is directed toward the front wheel of the corresponding front wheel case. In an advantageous embodiment, the outer edge of the guide surface in the transverse direction of the vehicle remains overlapping or slightly further outwards with the outer surface of the front wheel in question.

It is also proposed in an advantageous embodiment of the air guiding device that in the assembled state in the high-speed position the outside is directed transversely to the longitudinal direction of the vehicle, and preferably the inside is also directed transversely to the longitudinal direction of the vehicle.

In the high-speed positions described here, the outside or its surface normal is aligned in the vehicle transverse direction and, with an (approximately) parallel inside, its surface normal is also aligned (pointing in the opposite direction) in the vehicle transverse direction. An oncoming flow of the motor vehicle aligned parallel to the longitudinal direction of the vehicle is deflected only slightly by the air guiding device, for example only offset by the maximum overall width of the guiding surface, i.e. the maximum distance between the outside and the inside in the transverse direction of the vehicle. A portion of the inflow flowing past the outside is therefore preferably not deflected or slightly deflected, a portion of the inflow deflected by the inside of the guide surface is preferably deflected with little or no deflection (then preferably slightly inward of the vehicle) into the front wheel housing, so that one of the relevant rotating front wheel housing resulting negative pressure is reduced by the flow introduced. In an advantageous embodiment, the outer side is aligned in line with the outer surface of the front wheel and/or the front wheel well formed in the transverse direction of the vehicle. Alternatively, the outside is offset further to the outside of the vehicle (that is, to the left or right).

It is also proposed in an advantageous embodiment of the air guiding device that, in the assembled state in the neutral position, the outside and/or the inside is aligned parallel relative to the incident flow deflected by the motor vehicle resulting from a ram flow.

In this embodiment, the outside or its surface normal (in a main part of the outside) is aligned inclined to the longitudinal direction of the vehicle. In an advantageous embodiment, the inside is aligned parallel to the outside and is therefore also aligned at an angle to the longitudinal direction of the vehicle. In the advantageous embodiment, the inclination corresponds to the angle of the impinging flow, which is deflected from the (central) ram flow from the front of the vehicle to the side outwards. The outside of the guide surface thus causes the oncoming flow to be gently guided to the outside of the vehicle in the transverse direction of the vehicle (ie to the left or right). The outside preferably has such a curvature or curved edge that the deflected oncoming flow is fed with a slight inclination or parallel into the air flowing sideways past the motor vehicle. In the case of the front wheel in question, a vacuum situation preferably arises, which is directed to the outside of the vehicle in the transverse direction of the vehicle and only comes into contact with the outer surface of the motor vehicle again behind the front wheel. From the inside of the guide surface, the other portion of the inflow is preferably fed into the front wheel housing and/or into the area of a cooler for heat dissipation. In a preferred embodiment, a turbulent flow is brought about in the region of such a cooler in order to improve the heat absorption of the inflowing air compared to a laminar flow.

According to one embodiment, in the neutral position, a portion of the inflow mentioned, which is deflected by the air-guiding device, is small. In one embodiment, the resulting inflow offset of a deflected portion of the inflow is less than twice the maximum distance between the outside and inside of the airfoil. Said offset preferably corresponds approximately to said maximum distance.

• - eine Antriebsmaschine;
• - eine Mehrzahl von Rädern, von welchen zumindest ein Rad zum Vortrieb des Kraftfahrzeugs antreibbar ist;
• - zumindest einen Vorderradkasten, in welchem jeweils eines der Räder aufgenommen ist;
• - zumindest eine Luftleitvorrichtung nach einer Ausführungsform gemäß der obigen Beschreibung, wobei die Luftleitvorrichtung in Fahrzeug-Längsrichtung vor einem Vorderradkasten angeordnet ist; und
• - eine Stellvorrichtung für die Luftleitvorrichtung,

wobei die Luftleitvorrichtung entsprechend einem Fahrzustand des Kraftfahrzeugs mittels der Stellvorrichtung in die Bremsstellung, die Hochgeschwindigkeitsstellung und die Neutralstellung bringbar und haltbar ist.According to a further aspect, a motor vehicle is proposed, having at least the following components:

• - a prime mover;
• - A plurality of wheels, of which at least one wheel can be driven to propel the motor vehicle;
• - At least one front wheel housing, in which one of the wheels is accommodated;
• - At least one air guiding device according to an embodiment according to the above description, wherein the air guiding device is arranged in the longitudinal direction of the vehicle in front of a front wheel housing; and
• - an adjusting device for the air guiding device,

wherein the air guiding device can be brought and maintained in the braking position, the high-speed position and the neutral position by means of the actuating device in accordance with a driving state of the motor vehicle.

A motor vehicle, for example a racing vehicle, is proposed here, in which a drive machine for propelling the motor vehicle by means of at least one of a plurality of wheels is included. The at least one front wheel is housed in a front wheel housing, wherein at least one of the front wheel housings includes an air guiding device according to the above description.

As described above, the air guiding device is mounted on the motor vehicle or on the front wheel housing, so that the braking position, the high-speed position and the neutral position can be adjusted according to one embodiment as described above. An adjusting device is provided for moving the air guiding device, which represents a separate component which is connected to the motor vehicle and the guide surface or the joint as soon as the air guiding device is mounted on the motor vehicle. Alternatively, the adjusting device is a component of the air guiding device, so that the air guiding device can be installed as a preassembled structural unit together with the adjusting device with the motor vehicle or the front wheel housing or chassis.

In a (symmetrical) motor vehicle with two front wheels and two front wheel housings, two air guiding devices are preferably arranged symmetrically mirrored to one another in relation to the central axis of the motor vehicle or to the central axis of the inflow and are moved synchronously with one another for the braking position, the high-speed position and the neutral position. In a preferred embodiment, a cornering position can also be set, in which a contact pressure on the front wheel on the inside of the curve is increased or the cornering force of the wheel on the inside of the curve is increased. Depending on the driving condition, the wheel on the outside of the curve assumes a position which, for example, corresponds to the high-speed position or the neutral position.

The actuating device is controlled, for example, by an on-board computer of the motor vehicle or by an internal control device of the (respective) air guiding device, measuring devices such as a (transverse and/or longitudinal) acceleration sensor and/or a gyroscope being included. Alternatively or in addition, a position of an acceleration sensor (e.g. a so-called gas pedal) of the motor vehicle and/or a steering angle on the steering device (e.g. a steering wheel) of the motor vehicle is decisively used solely or additionally for the desired position of the (respective) air guiding device as a control variable.

• - in der Bremsstellung von der Luftleitvorrichtung, bevorzugt von der Außenseite, zum größeren Anteil an dem Vorderradkasten vorbei nach Fahrzeug-Außen geleitet wird;
• - in der Hochgeschwindigkeitsstellung von der Luftleitvorrichtung, bevorzugt von der Innenseite, zum größeren Anteil in den Vorderradkasten hinein und/oder in den Bereich eines Wärmetauschers geleitet wird; und/oder
• - in der Neutralstellung ein Umlenken der Anteile der genannten Anströmung mittels der Luftleitvorrichtung gering ist und/oder der resultierende Versatz der Anströmung eines von der Leitfläche umgelenkten Anteils der Anströmung geringer als das Zweifache des maximalen Abstands zwischen der Außenseite und der Innenseite der Luftleitvorrichtung ist, bevorzugt der genannte Versatz etwa dem genannten maximalen Abstand entspricht.

It is also proposed in an advantageous embodiment of the motor vehicle that an oncoming flow deflected in the vehicle transverse direction, which results from a ram flow caused by forward travel of the motor vehicle, is guided as follows, depending on the respective position:

• - Is conducted in the braking position of the air guiding device, preferably from the outside, to the greater part of the front wheel housing over to the outside of the vehicle;
• - In the high-speed position of the air-guiding device, preferably from the inside, is directed to a greater extent into the front wheel housing and/or into the region of a heat exchanger; and or
• - in the neutral position, a deflection of the portions of said inflow by means of the air guiding device is small and/or the resulting offset of the inflow of a portion of the inflow deflected by the guide surface is less than twice the maximum distance between the outside and the inside of the air guiding device, preferably said offset approximately corresponds to said maximum distance.

In this embodiment, the air guiding device is set up according to an embodiment as described above. In an advantageous embodiment, the outer side or the outermost edge of the outer side in the transverse direction of the vehicle is always arranged so that it overlaps with the outer contour of the relevant front wheel or is offset to the outside. Particularly preferably, the outer side or the relevant outer edge of the outer side always remains in the same position or at least overlaps with the outer contour mentioned. In one embodiment, the surface normal of the outside and/or the surface normal of the inside is oriented parallel relative to the oncoming flow that results from a ram flow and is deflected by the motor vehicle.

• 1: in einer räumlichen Seitenansicht eine linke Luftleitvorrichtung eines linken Vorderradkastens in einer Bremsstellung;
• 2: in einer Draufsicht ein Ausschnitt eines Kraftfahrzeugs mit zwei Luftleitvorrichtungen gemäß 1 in einer Bremsstellung;
• 3: in einer räumlichen Seitenansicht eine linke Luftleitvorrichtung gemäß 1 in einer Hochgeschwindigkeitsstellung;
• 4: in einer Draufsicht ein Ausschnitt eines Kraftfahrzeugs mit zwei Luftleitvorrichtungen gemäß 3 in einer Hochgeschwindigkeitsstellung;
• 5: in einer räumlichen Seitenansicht eine linke Luftleitvorrichtung gemäß 1 und 3 in einer Neutralstellung;
• 6: in einer Draufsicht ein Ausschnitt eines Kraftfahrzeugs mit zwei Luftleitvorrichtungen gemäß 5 in einer Neutralstellung; und
• 7: ein Kraftfahrzeug mit zwei Luftleitvorrichtungen in einer Draufsicht.

The invention described above is explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way limited by the purely schematic drawings, it being noted that the figs are not true to size and are not suitable for defining proportions. It is presented in

• 1 1: in a three-dimensional side view, a left-hand air guiding device of a left-hand front wheel housing in a braking position;
• 2 1: in a plan view a section of a motor vehicle with two air guiding devices according to FIG 1 in a braking position;
• 3 : in a three-dimensional side view, a left air guiding device according to FIG 1 in a high speed position;
• 4 1: in a plan view a section of a motor vehicle with two air guiding devices according to FIG 3 in a high speed position;
• 5 : in a three-dimensional side view, a left air guiding device according to FIG 1 and 3 in a neutral position;
• 6 1: in a plan view a section of a motor vehicle with two air guiding devices according to FIG 5 in a neutral position; and
• 7 : a motor vehicle with two air guiding devices in a plan view.

In 1 is shown in a three-dimensional side view of a left air guiding device 1 of a left front wheel house 3 in a braking position. The vehicle vertical direction 14 points upwards in the plane of the page, the vehicle longitudinal direction points slightly to the left into the plane of the page, and the vehicle transverse direction 16 points slightly out of the plane of the page to the left. This description applies analogously to the right-hand side of an (roughly) symmetrical motor vehicle 5 . The motor vehicle 5 is shown here only in part and, for example, as in 7 executed. The (left) air guiding device 1 comprises a (left) guiding surface 6 which has an outside 8 and an inside 9 . The (left) guide surface 6 is movably connected to the left front wheel housing 3 by means of a joint 11 . The orientation in the braking position of the (left) air guiding device 1 is in the following 2 easy to see and explained in more detail there with the depiction of the oncoming flow 18 .

In 2 is a section of a motor vehicle 5 with two air guiding devices 1.2 according to FIG 1 shown in a braking position. In this exemplary embodiment, the motor vehicle 5 comprises a right-hand front wheel housing 4 and a left-hand front wheel housing 3, which are (optionally) shaped symmetrically here. The vehicle vertical direction 14 points out of the plane of the drawing, the vehicle transverse direction 16 is horizontal and the vehicle longitudinal direction 15 is vertical, with the forward drive 25 pointing downwards in the illustration. A front wheel 20,21 (preferably set up for propulsion) is housed within the front wheel housings 3,4. The left-hand air-guiding device 1 and the right-hand air-guiding device 2 are each arranged in the longitudinal direction 15 of the vehicle when driving forward 25 in front of the respective front wheel housing 3.4 and preferably form the only barrier there to the relative flow field 32 of the motor vehicle 5 when driving forward 25. The guide surfaces 6 , 7 are each mounted via a fastening device 10 by means of a joint 11 and an adjusting device 24 so as to be movable about a vehicle vertical direction 14 (shown here purely schematically pars-pro-toto only in the right-hand front wheel housing 4). In the illustrated embodiment, the joint 11 comprises (purely optional) a first joint axis 12 and a second joint axis 13, about which the guide surfaces 6, 7 can each be pivoted for complex movability. In this exemplary embodiment, the motor vehicle 5 is in forward travel 25 , and a heat exchanger 29 is positioned transversely to forward travel 25 . Due to the contour of the motor vehicle 5, a ram flow 17 arises in the relative flow field 32, which is deflected sideways (ie in the transverse direction 16 of the vehicle), ie a deflected inflow 18 towards the air guiding devices 1,2 is generated. As a result of the braking position, i.e. the positioning of the guide surfaces 6, 7 slightly (in the vehicle longitudinal direction 15) somewhat inward and/or the front wheel housing 3, 4 almost or completely closing position, at least the largest part 26 of the deflected inflow 18 is at the front wheel housing 3, 4 and diverted with a high vector transverse component to the outside of the vehicle 28 in the relative flow field 32 at the respective front wheel 20,21. In the process, turbulence is generated and the formation of a negative pressure within the front wheel housings 3,4 as a result of the rotation of the respective wheel 20,21 is not impaired or even increased by a negative pressure at the respective wheel 20,21 on the outside 28 of the vehicle. This increases the drag coefficient and supports deceleration of the motor vehicle 5 . In this embodiment, the deflected inflow 18 flows against the heat exchanger 29 little or not at all. The respective outer edge 33 of the left guide surfaces 6.7 is in line with the outer contour of the respective front wheel housing 3.4.

In 3 1 is a spatial side view of a left air guide device 1 of a left front wheel house 3 in a high speed position. For the sake of clarity, the view and the shape of the components are largely identical to those shown in 1 embodiment shown is identical, so that reference is made to the description there. The orientation in the high speed position of the (left) airfoil 1 is in the following 4 easy to see and explained in more detail there with the depiction of the oncoming flow 18 .

In 4 is a section of a motor vehicle 5 with two air guiding devices 1.2 according to FIG 3 shown in a high speed position. Here, too, without excluding the general public, purely for the sake of clarity, the section of motor vehicle 5 is largely identical to that in 2 embodiment shown is identical, so that reference is made to the description there.

Here, the respective outside 8 (or their surface normal) of the guide surfaces 6 , 7 is oriented toward the outside 28 of the vehicle and the (roughly) parallel inside 9 is also oriented in the opposite direction, roughly in the transverse direction 16 of the vehicle. The guide surfaces 6 , 7 are thus aligned approximately parallel to the relative flow field 32 . As a result, the deflected oncoming flow 18 is directed to a first portion 26 with a small relative angle in the relative flow field 32 on the vehicle exterior 28 of the respective wheel 20,21. A second portion 27 of the deflected inflow 18 is directed into the respective front wheel housing 3.4 (and optionally to a further portion towards the heat exchanger 29). The volume of air flowing into the front wheel housing 3.4 reduces the formation of a negative pressure which results from the rotation of the respective front wheel 20,21. The first portion 26 and the second, second portion 27 of the deflected inflow 18 are offset from each other only by the maximum distance 31 from the outside 8 and the inside 9 of the respective guide surface 6.7. The offset 30 of the inflow components relative to one another is therefore small, for example less than twice the maximum distance 31 from the outside 8 to the inside 9. In addition, the deflected inflow 18 is only deflected in the direction of the relative flow field 32. This achieves a low drag coefficient when driving straight ahead. Here, too, the respective outer edge 33 of the left guide surfaces 6.7 is in line with the outer contour of the respective front wheel housing 3.4. It should be noted that the outer edge 33 compared to that in 2 Braking position shown is now another area of the outside 8 of the respective guide surface 6.7.

In 5 is shown in a spatial side view of a left air guiding device 1 of a left front wheel house 3 in a neutral position. For the sake of clarity, the view and the shape of the components are largely identical to those shown in 1 and 3 embodiment shown is identical, so that reference is made to the description there. The orientation in the neutral position of the (left) air guiding device 1 is in the following 6 easy to see and explained in more detail there with the depiction of the oncoming flow 18 .

In 6 is a section of a motor vehicle 5 with two air guiding devices 1.2 according to FIG 3 shown in a neutral position. Here, too, without excluding the general public, purely for the sake of clarity, the section of motor vehicle 5 is largely identical to that in 2 and 4 embodiment shown is identical, so that reference is made to the description there.

Here, the respective outer side 8 of the guide surfaces 6, 7 and the (approximately) parallel inner side 9 are aligned approximately in the direction of the deflected oncoming flow 18 impinging there. As a result, the deflected oncoming flow 18 is directed to a first portion 26 with a small relative angle in the relative flow field 32 on the vehicle exterior 28 of the respective wheel 20,21. However, the angle is larger than in the high-speed position (cf 4 ) and thus causes a greater flow resistance here. A second portion 27 of the deflected inflow 18 is directed into the respective front wheel housing 3.4 (and optionally to a further portion towards the heat exchanger 29). The volume of air flowing into the front wheel housing 3.4 reduces the formation of a negative pressure which results from the rotation of the respective front wheel 20,21. However, the second portion 27 is less than in the high-speed position and/or already directed towards the outside 28 of the vehicle, so that the (reducing) influence on the vacuum generated by the rotating wheel 20,21 is lower in the neutral position compared to the high-speed position. The first part 26 and the second second part 27 of the deflected inflow 18 are also offset from each other here only by the maximum distance 31 from the outside 8 and the inside 9 of the respective guide surface 6.7. The offset 30 of the inflow portions relative to one another is therefore small, for example less than twice the maximum distance 31 from the outside 8 to the inside 9. In addition, the deflected inflow 18 is only slightly (preferably the first portion 26 not) deflected. A relatively low cd value is thus achieved when driving straight ahead, while at the same time good lateral guidance of the motor vehicle 5 is achieved by means of the front wheels 20,21.

Here, too, the respective outer edge 33 of the left guide surfaces 6.7 is in line with the outer contour of the respective front wheel housing 3.4. It should be noted that the outer edge 33 compared to that in 2 and 4 brake position shown now in turn is another area of the outside 8 of the respective guide surface 6.7.

In 7 a motor vehicle 5 with two air guiding devices 1,2 is shown in a plan view. The motor vehicle 5 comprises a drive machine 19 which is set up for propulsion by means of a left rear wheel 22 and a right rear wheel 23 (and preferably also by means of the two front wheels 20, 21). The two front wheels 20,21 are enclosed by a left front wheel housing 3 and a right front wheel housing 4. According to the illustration, on the right (ie in forward travel 25 in front of) the front wheel housings 3 , 4 , the air guiding devices 1 , 2 are arranged with a left guiding surface 6 and a right guiding surface 7 . The guide surfaces 6.7 are connected to the front wheel housings 3.4 by means of a joint 11 (and a fastening device 10, not shown).

With the air guiding device proposed here, a favorable aerodynamic profile can be generated for many driving conditions.

Reference List

1

left air deflector

2

right air deflector

3

left front wheel housing

4

right front wheel housing

5

motor vehicle

6

left guide surface

7

right guide surface

8th

outside

9

inside

10

fastening device

11

joint

12

first joint axis

13

second joint axis

14

Vehicle vertical direction

15

vehicle longitudinal direction

16

vehicle transverse direction

17

ram flow

18

deflected flow

19

prime mover

20

left front wheel

21

right front wheel

22

left rear wheel

23

right rear wheel

24

actuator

25

forward drive

26

first part of the inflow

27

second part of the inflow

28

vehicle exterior

29

heat exchanger

30

Offset of the inflow components

31

Distance from outside and inside

32

relative flow field

33

outer edge

Claims (7)

Air guiding device (1,2) for a front wheel housing (3,4) of a motor vehicle (5), having at least the following components: - a guiding surface (6,7) with an outside (8) and with an inside (9); - A fastening device (10) for fixing the air guiding device (1,2) on a motor vehicle (5) in front of its front wheel housing (3,4); and - a joint (11) between the guide surface (6,7) and the fastening device (10), so that the guide surface (6,7) can be moved relative to the fastening device (10), characterized in that the guide surface (6, 7) a braking position, a high speed position and a neutral position can be assumed by moving the joint (11). Air guiding device (1.2) after claim 1 , wherein the joint (11) has two joint axes (12,13), the joint axes (12,13) preferably being aligned along the vertical direction (14) of the vehicle. Air guiding device (1.2) after claim 1 or claim 2 , wherein in the installed state in the braking position the outside (8) is directed forward in the longitudinal direction (15) of the vehicle. Air guiding device (1,2) according to one of the preceding claims, wherein in the assembled state in the high-speed position the outside (8) is oriented transversely to the longitudinal direction (15) of the vehicle, and preferably the inside (9) is also oriented transversely to the longitudinal direction of the vehicle ( 15) is directed. Air guiding device (1,2) according to one of the preceding claims, wherein in the assembled state in the neutral position the outside (8) and/or the inside (9) relative to the force resulting from a ram flow (17). Vehicle (5) deflected flow (18) is aligned parallel. Motor vehicle (5), having at least the following components: - a prime mover (19); - A plurality of wheels (20,21,22,23), of which at least one wheel (22,23) can be driven to propel the motor vehicle (5); - At least one front wheel housing (3,4) in which one of the wheels (20,21) is accommodated; - At least one air guiding device (1,2) according to one of the preceding claims, wherein the air guiding device (1,2) is arranged in the vehicle longitudinal direction (15) in front of a front wheel housing (3,4); and - an adjusting device (24) for the air guiding device (1,2), wherein the air guiding device (1,2) can be brought into the braking position, the high-speed position and the neutral position by means of the adjusting device (24) and can be held in accordance with a driving state of the motor vehicle (5). . Motor vehicle (5) after claim 6 , wherein an inflow (18) deflected in the transverse direction (16) of the vehicle, which results from a ram flow (17) caused by forward travel (25) of the motor vehicle (5), is guided as follows depending on the respective position: - in the Braking position of the air guiding device (1,2), preferably from the outside (8), to the greater part (26) on the front wheel housing (3,4) passed to the outside of the vehicle (28); - in the high-speed position of the air-guiding device (1,2), preferably from the inside (9), to the greater part (27) in the front wheel housing (3,4) and/or into the area of a heat exchanger (29); and/or - in the neutral position, the portions (26,27) of said inflow (18) are deflected by means of the air guiding device (1,2) and/or the resulting offset (30) of the inflow (18) from the guide surface (6.7) deflected portion (26.27) of the oncoming flow (18) is less than twice the maximum distance (31) between the outside (8) and the inside (9) of the air guiding device (1.2), preferably the Said offset (30) corresponds approximately to said maximum distance (31).

Images