motor vehicle

Abstract

Motor vehicle (1) with an underbody (2) and with an open air duct (6) arranged on the underbody (2), wherein an adjustable air guide element (17) is arranged upstream of the air duct (6) to influence the flow through the air duct (6), wherein the air guide element (17) is a displaceable air guide element (17) which is displaceable in the region of an air inlet (9) of the air duct (6) upstream of the air duct (6) along a displacement line (18), wherein the air guide element (17) is displaceable between a first operating position (11) and a second operating position (12), wherein the air guide element (17) is a barrier element displaceable along a displacement line (18),which, in a first operating position (11), protrudes substantially perpendicularly or at a predefined angle to the subfloor (2) in a first position and, in the second operating position (12), protrudes substantially perpendicularly or at a predefined angle to the subfloor (2) in a second position.

Description

The invention relates to a motor vehicle having an underbody and having an open air duct arranged on the underbody.Motor vehicles with open air ducts in the underbody are known. These open air ducts are known as diffuser ducts. They are open at one side downwards and guide the air flowing under the vehicle along the underbody in a defined manner and thereby influence the underflow of the motor vehicle and thus influence the output of the motor vehicle.WO 2014 / 072598 A2 discloses air ducts of this type on the underbody of a motor vehicle, in which closure flaps are arranged on the outflow side in order to close the air duct at the end. This has the disadvantage that the positioning of such closure flaps is restricted because it is to be arranged in the respective air duct.JP 2006-69 396 A discloses a motor vehicle having a variable air guiding element on the underbody in front of the front wheel houses.It is therefore the object of the present invention to provide a motor vehicle having an underbody and having an open air duct arranged on the underbody, which is improved compared to the prior art and permits improved control of the air flowing through the air duct.The object is achieved with the features of claim 1.An exemplary embodiment of the invention relates to a motor vehicle having an underbody and having an open air duct arranged on the underbody, wherein an adjustable air guiding element is arranged upstream of the air duct in order to influence the flow through the air duct. This allows effective influencing of the flow through the air duct. Thus, in a first operating position, the flow can be prevented to the greatest possible extent, while the flow through the air duct can take place unimpeded in a second operating position. In this case, an air duct can be a duct which is U-shaped in section and is formed so as to be open on one side and is formed so as to rise towards a duct end.It is particularly advantageous here if the air duct is a diffuser duct. The diffuser channel can be a diffuser channel of the front axle or a diffuser channel of the rear axle, such as a front diffuser or such as a rear diffuser. It is particularly advantageous here if the diffuser channel is a wheel diffuser channel. Air can thus be directed in a targeted manner to the wheel arch.It is also advantageous if the channel is a brake air channel, so that the air can be conducted in a defined manner to a wheel brake or the air flow to the wheel brake can be prevented in a targeted manner.According to the invention, the air guiding element is a displaceable air guiding element. As a result, in the case of the pivotable air guiding element not according to the invention, the latter can be deployed in the first operating position and placed in the wind, that is to say in the air flow, and in the second operating position it can be deployed to the underbody and taken out of the wind. In the case of a displaceable air guiding element, the air guiding element can be adjusted or displaced in the first operating position into a position active for the diffuser duct and in the second operating position into a position inactive for the diffuser duct.According to the invention, the air guiding element is an air guiding element displaceable along a displacement line in the region of an air inlet of the air duct upstream of the air duct, wherein the air guiding element is displaceable between a first operating position and a second operating position. As a result, the air guiding element can influence the inflow of air into the air duct.Accordingly, it is also advantageous if the air guiding element guides air past the air duct in a first operating position and allows air to flow into the air duct in a second operating position. Thus, the flow through the air duct can be influenced by adjusting the air guiding element.It is also advantageous if the air guiding element not according to the invention is a flap which can be pivoted about a transverse axis and which, in a first operating position, protrudes substantially perpendicularly or at a predefined angle to the underbody and, in the second operating position, bears substantially flat against the underbody. Thus, in the active operating state, a predefined effect is achieved, while the air guiding element is substantially without an undesired effect in the second operating position.According to the invention, the air guiding element is a barrier element which can be displaced along a displacement line and which, in a first operating position, protrudes substantially perpendicularly or at a predefined angle to the underbody in a first position and, in the second operating position, protrudes substantially perpendicularly or at a predefined angle to the underbody in a second position. As a result, an effect on the air flow can be achieved even in the second operating position.It is also advantageous if the first position is a position which lies in front of the air duct and if the second position is a position which lies laterally away from the air duct. As a result, in the first operating position, the inflow into the air duct can be prevented or reduced, so that the air flows along in a otherwise diverted manner.It is advantageous if the air guiding element is oriented at a defined angle to the vehicle longitudinal direction in the first and / or in the second operating position, in particular at an angle of approximately 30° to 60°, preferably 35° to 45°. In this way, an optimized effect of the air deflection is achieved.The invention is explained in detail below on the basis of an exemplary embodiment with reference to the drawing. The drawing shows: FIG. 1 shows a schematic partial view of a motor vehicle not according to the invention in the region of the underbody in a first operating position, FIG. 2 shows a schematic partial view of the motor vehicle not according to the invention in the region of the underbody in a second operating position, FIG. 3 shows an illustration of an air guiding device not according to the invention in two operating positions, FIG. 4 shows a schematic partial view of a motor vehicle according to the invention in the region of the underbody in a first operating position, and FIG. 5 shows a schematic partial view of the motor vehicle according to the invention in the region of the underbody in a second operating position.FIG. 1 shows a schematic illustration of a nose of a motor vehicle 1 not according to the invention with an underbody 2. The front wheel suspension 3 has at least one wheel 4 with a brake 5.At least one open air duct 6 is arranged on the underbody 2. The air duct 6 is preferably U-shaped and allows the flow of air along the air duct 6.To influence the flow of air through the air duct 6, an adjustable air guiding element 7 is arranged upstream of the air duct 6.The air guiding element 7 can be controlled according to requirements, for example, a control or regulation can take place as a function of the driving speed of the motor vehicle. The control or regulation can also take place as a function of the need for brake cooling.FIG. 1 shows that the air duct 6 is a diffuser duct, such as a wheel diffuser duct, which serves to influence the output of the motor vehicle. Air flows along the air duct 6 in the direction of the wheel house 8, in which the wheel 4 is arranged. The air duct 6 preferably has a surface rising towards the wheel arch 8 in the vertical direction.The air duct 6 can also be used as a brake air duct in order to be able to conduct or block additional brake air to the brake 5 in a targeted manner, if appropriate.The air guiding element 7 is advantageously a pivotable and / or displaceable air guiding element 7. as a result, depending on the setting of the air guiding element 7, a defined effect on the air duct 6 or on the flow through the air duct 6 can be produced. Thus, in FIG. 1, the air guiding element 7 is arranged in the region of an air inlet 9 of the air duct 6 upstream of the air duct 6 and is designed as an air guiding element 7 which can be pivoted about a pivot axis 10. In this case, the air guiding element 7 can be displaceable between a first operating position and a second operating position.In FIG. 1, the air guiding element 7 is shown as being set in the first operating position. In FIG. 2, the air guiding element 7 is shown as being set in the second operating position. Thus, the air guiding element is set in the first operating position in such a way that it guides air past the air duct 6 and is set in a second operating position in such a way that it allows air to flow into the air duct. Thus, the pivotable air guiding element is folded out adjacent to the air inlet 9 such that it projects from the underbody 2 substantially perpendicularly or at a defined angle. As a result, air is discharged from the flared air guiding element 7 and flows substantially past the air duct 6.In FIG. 2, the pivotable air guiding element 7 is folded against the underbody 2 adjacent to the air inlet 9, such that it substantially bears against the underbody 2. As a result, air is not significantly influenced by the air guiding element 7 which is placed on it and flows into the air duct 6 and along the air duct.FIG. 3 schematically shows that the air guiding element 7 not according to the invention is a flap which can be pivoted about a transverse axis, such as pivot axis 10, and which in a first operating position 11 projects substantially perpendicularly or at a predefined angle β with respect to the underbody 2 and in the second operating position 12 bears substantially flat against the underbody 2.FIG. 1 also shows that the air guiding element 7 is oriented at a defined angle α to the vehicle longitudinal direction 13, in particular at an angle of approximately 30° to 60°, preferably 35° to 45°, approximately in the first and / or in the second operating position.The air guiding element 7 is dimensioned in particular as a rectangular element with an extension of approximately 20 to 80 mm, preferably 40 mm, in the height direction with an approximately single to double width of the air duct 6 in the width direction.In this case, the air guiding element 7 can be designed as a thin lip or as a flag flap according to FIG. 3. However, it can also be designed as a stable shaped body.FIGS. 4 and 5 show an alternative exemplary embodiment according to the invention of an air guiding element 17. the air guiding element 17 is designed as a barrier element which can be displaced along a displacement line 18 and which, in a first operating position, see FIG. 5, projects substantially perpendicularly or at a predefined angle from the underbody in a first position and, in the second operating position, see FIG. 4, projects substantially perpendicularly or at a predefined angle from the underbody in a second position. In this case, the air guiding element 17 is in a position in front of the air duct 6 in the first position, so that the latter is blocked. The second position is a position that is laterally away from the air duct 6, so that an inflow of the air duct 6 is possible.The remaining features of the general arrangement and of the air guiding element 17 correspond substantially to the circumstances relating to the air guiding element 7, as already described with reference to FIGS. 1 and 2. Reference is made accordingly in this respect.

Claims

Motor vehicle (1) having an underbody (2) and having an open air duct (6) arranged on the underbody (2), wherein an adjustable air guiding element (17) is arranged upstream of the air duct (6) in order to influence the flow through the air duct (6), wherein the air guiding element (17) is a displaceable air guiding element (17) which is displaceable along a displacement line (18) in the region of an air inlet (9) of the air duct (6) upstream of the air duct (6), wherein the air guiding element (17) is displaceable between a first operating position (11) and a second operating position (12), wherein the air guiding element (17) is a barrier element which is displaceable along a displacement line (18), which projects in a first position substantially perpendicularly or at a predefined angle to the underbody (2) in a first operating position (11), and projects in a second position substantially perpendicularly or at a predefined angle to the underbody (2) in the second operating position (12).Motor vehicle (1) according to claim 1, characterised in that the air duct (6) is a diffuser duct, such as a wheel diffuser duct.Motor vehicle (1) according to Claim 1, characterized in that the air duct (6) is a brake air duct.Motor vehicle (1) according to Claim 1, 2 or 3, characterized in that the air-guiding element (17), in a first operating position (11), conducts air past the air duct (6) and, in a second operating position (12), allows air to flow into the air duct (6).Motor vehicle (1) according to Claim 1, 2, 3 or 4, characterized in that the first position is a position which lies in front of the air duct (6) and in that the second position is a position which lies laterally away from the air duct (6).Motor vehicle (1) according to one of the preceding claims, characterized in that the air guiding element (17), in the first and / or in the second operating position (11, 12), is oriented at a defined angle to the vehicle longitudinal direction (13), in particular at an angle of approximately 30° to 60°, preferably 35° to 45°.

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