DE102008020086A1 - Body element for motor vehicle, has rear window frame for receiving rear window and roof area arranged upside rear window frame - Google Patents

Abstract

The body element (10) has a rear window frame (16) for receiving a rear window (18) and a roof area (20) arranged upside the rear window frame. A lower body area (22) is arranged below the rear window frame. The body element has a fin (24), at a distance to a side wall outlet (36), for dissipating air flows. The fin is arranged vertically between the roof area and the lower body area.

Description

The The present invention relates to a bodywork element for a motor vehicle, in particular at least partially forms a rear of the motor vehicle.

At the Driving a motor vehicle in the stream Rear area of the motor vehicle air flows over a roof area, a Rear window and a trunk lid and right on the sides of the motor vehicle over. The air flows lead in the tail area of the motor vehicle due to turbulence among others an increased Air resistance and thereby increased fuel consumption.

It the object of the invention is a bodywork element for a motor vehicle to provide, which has improved air resistance.

According to the invention Problem solved by the features of claim 1. Preferred developments The invention are specified in the subclaims.

The Body element according to the invention for a motor vehicle includes a rear window frame for receiving a rear window. Above the rear window frame is a roof area and below the rear window frame arranged a lower body portion. According to the invention, the body element at least one fin spaced from a sidewall outlet for Discharge of air streams on, with the fin between the roof area and the lower body area is arranged substantially vertically. It is with the bottom Body section essentially meant the area itself located below the vehicle windows. Further, under a rear area of the motor vehicle, the area of the body understood the rear window frame, the rear window, the roof area above the rear window frame and the lower body area includes below the rear window frame.

With the aid of the body element according to the invention, it is achieved that the air flows flowing past the motor vehicle are released exactly at the position of the fin in the rear region of the motor vehicle. In this way, the air flows at a previously defined, aerodynamically advantageous position controlled derived from the vehicle and unsteady turbulence can be reduced. In particular, in motor vehicles with a round tail, in which the air currents do not constantly detach from the rear, a defined separation point and a constant aerodynamics is made possible by the vertically arranged fin in the first place. Occurring rear buoyancy forces can be reduced, whereby the driving stability is improved. Furthermore, the air resistance of the motor vehicle is reduced, whereby the fuel consumption and the CO ₂ emissions are reduced due to the improved air resistance.

in this connection the knowledge is exploited that the flowing past the motor vehicle air flows in particular in a rounded tail shape, initially nestle against the stern and controlled by something inside can be directed before she controls herself at a point defined by the Finn supersede can. This reduces the dead water area created behind the stern be without an uncontrolled flow with many vertebrae in To have to buy. This Effect is exploited by the fact that the fin to the side wall outlet spaced apart and thereby not on the side wall followed but in proportion to the side wall further arranged offset inwards. Under the side wall outlet is understood to be the location at the sectional view from the top on a straight or slightly curved sidewall an intermediate body area with a greater curvature, that is smaller Radius, connects, the transition between the different radii of the sidewall and the intermediate body area not necessarily sharp-edged but gradually can be designed. The theoretical intersection of the radii the sidewall and the intermediate body area define the Side wall outlet. Especially with rounded tail shapes closes after the intermediate body area an optionally curved rear area with a radius greater than the radius of the intermediate body area is smaller and in particular is the radius of the sidewall, with the radius of the sidewall in principle also be infinitely large can. The average distance d of the fin to the sidewall outlet is in particular 30 mm ≤ d ≤ 250 mm, preferably 80 mm ≤ d ≤ 200 mm, continue preferably 130 mm ≤ d ≤ 170 mm and more preferably d = 150 mm ± 5 mm.

Preferably, the fin is substantially elongated and has a substantially triangular cross-section. In this way, it is made possible that the triangular edge of the fin pointing away from the motor vehicle rises in the direction of the rear area and the airstreams flowing past the motor vehicle flow from the surface of the motor vehicle via one of the triangular areas of the fin to the triangular edge pointing away from the motor vehicle and away from the vehicle , Turbulence in the rear and the so-called aerodynamic rear lift are reduced, so that the vehicle stability and thus a safe driving ge can be guaranteed. The fin has a height h perpendicular to the body element for which in particular 10 mm ≦ h ≦ 50 mm, preferably 15 mm ≦ h ≦ 35 mm and particularly preferably 20 mm ≦ h ≦ 25 mm. This height h ensures that the flow separates in a controlled manner and does not cling to the body behind the fin.

Especially It is advantageous if the fin on the built-in rear window extends, so that the fin is also arranged in the area of the rear window or can be attached directly to the rear window. On this way is also prevented in the area of the rear window the airflows to flow around the rear window and afterwards Uncontrolled release from the vehicle. This avoids swirling to a troubled ride to lead and due to increased Rear lift forces the braking behavior is negatively influenced.

Advantageous can be a long side arranged the fin adjacent to a C and / or D-pillar of the motor vehicle be. In particular, the fin directly or via a interposed body panel on the C and / or D-pillar of the Motor vehicle adjacent and / or connected, so that a simple Assembly and / or disassembly on the C and / or D-pillar of the Motor vehicle possible is.

Preferably extends the fin substantially parallel to the C and / or D pillars of the Motor vehicle, so that a stable connection between the fin and the respective C and / or D column can be made possible.

In a preferred embodiment the fin is formed by a C and / or D pillar of the motor vehicle. In this way, a one-piece and cost-effective production of the fin possible together with other elements of the motor vehicle. Further can the stability the fin ensured by a better connection to the body and additional Assembly work can be saved.

Especially For example, the fin may have a first face and a second face exhibit. The first front side can be to the roof area and the second Front side can adjoin the lower body area. On this way will ensure that no additional Heckauftrieb and / or air resistance by partially flowing through the airflows between the roof area and the fin or between the fin and the lower body area may arise.

Preferably an underside of the fin is flat against the motor vehicle. The cross section of the fin can aerodynamically to any surface structure be adapted to a motor vehicle, so that the air flows to aerodynamically sensible way to be led away individually from the vehicle can.

Preferably the fin is shaped in such a way that air flows flowing along the motor vehicle substantially eddy-free and with reduced Heckauftriebsinduzierung from the motor vehicle can be derived, so that unstable and high Heckauftriebskräfte avoided can be. Even at high speeds, a constant braking and lane stability can be achieved become.

The invention further relates to a motor vehicle comprising a body element, which may be formed and further developed as described above. As a result, highly swirling air flows behind the vehicle rear area can be avoided before they occur. The rear lift and the aerodynamic drag of the motor vehicle are thereby reduced. Furthermore, the driving stability is improved and a reduction in fuel consumption and CO ₂ emissions is achieved.

following the invention with reference to the accompanying drawings explained in more detail. Further Advantages and designs arise from the claims.

It demonstrate:

1 a schematic perspective view of a rear portion of a motor vehicle according to the prior art,

2 a schematic perspective view of a rear portion of a motor vehicle with a body element according to the invention,

3 a schematic view of a plan view of the rear of the motor vehicle 2 and

4 a schematic sectional view of a motor vehicle with a body element according to the invention.

In 1 is a body element 10 of a motor vehicle according to the prior art. When driving the motor vehicle flow air currents 12 , which are shown here in a single air flow line, immediately past the motor vehicle and solve uncontrollably and with strong turbulence 14 from the rear of the motor vehicle, whereby both the Heckauftriebskräfte the rear of the motor vehicle and the air resistance of the motor vehicle are increased.

In 2 is the motor vehicle off 1 with an inventive body element 10 shown. In this case, the body element comprises 10 a rear window frame 16 for receiving a rear window 18 , one above the rear window frame 16 arranged roof area 20 and one below the rear window frame 16 arranged lower body area 22 , Furthermore, an elongated fin 24 shown vertically on the rear window 18 , between the roof area 20 and the lower body area 22 is arranged. By the Finn 24 become the air streams 12 controlled detached from the motor vehicle and derived from the vehicle. In this way, the in 1 shown turbulences 14 be prevented as far as possible.

In 3 is visible that the Finn 24 a substantially triangular cross-section with a first end face 26 , a second end face, not shown, and a flat surface on the motor vehicle 28 having. The Finn 24 points perpendicular to the bodywork element 10 a height h = 22 mm.

At the in 4 illustrated sectional view of the body element 10 has the bodywork element in the lower body area 22 a side wall 30 with a radius R ₁ = 10000 mm, to which an intermediate body area 32 followed by a radius R ₂ = 300 mm, to which in turn a tail area 34 a radius R ₃ = 3000 mm connects. The theoretical intersection of the radius R ₂ with the radius R ₁ defines a sidewall outlet 36 to which the Finn 24 spaced apart.

10

body member

12

Air flow line

14

turbulence

16

rear window frame

18

rear window

20

roof

22

lower body area

24

fin

26

first front

28

bottom

30

Side wall

32

Between the body area

34

rear area

H

height

R ₁ ,

R ₂ , R ₃ radius

Claims (10)

Body element for a motor vehicle ( 10 ) comprising a rear window frame ( 16 ) for receiving a rear window ( 18 ), one above the rear window frame ( 16 ) arranged roof area ( 20 ) and one below the rear window frame ( 16 ) arranged lower body portion ( 22 ), characterized in that the body element at least one to a side wall outlet ( 36 ) spaced fin ( 24 ) for diverting air streams ( 12 ), wherein the fin ( 24 ) between the roof area ( 20 ) and the lower body area ( 22 ) is arranged substantially vertically. Body element according to claim 1, characterized in that the fin ( 24 ) is elongated substantially long and has a substantially triangular cross-section. Body element according to claim 1 or 2, characterized in that the fin ( 24 ) via the built-in rear window ( 18 ). Body element according to one of claims 1 to 3, characterized in that a longitudinal side of the fin ( 24 ) adjacent to a C and / or D pillar of the motor vehicle ( 10 ) is arranged. Body element according to one of claims 1 to 4, characterized in that the fin ( 24 ) substantially parallel to the C and / or D pillar of the motor vehicle ( 10 ) runs. Body element according to one of claims 1 to 5, characterized in that the fin ( 24 ) through a C and / or D pillar of the motor vehicle ( 10 ) is trained. Body element according to one of claims 1 to 6, characterized in that the fin ( 24 ) a first end face ( 26 ) and a second end face, and the first end face ( 26 ) to the roof area ( 20 ) and the second end face to the lower body area ( 22 ) adjoins. Body element according to one of claims 1 to 7, characterized in that a bottom ( 28 ) the Finnish man ( 24 ) on the motor vehicle ( 10 ) lies flat. Body element according to one of claims 1 to 8, characterized in that the fin ( 24 ) is shaped such that on the motor vehicle ( 10 ) along flowing air streams ( 12 ) from the vehicle ( 10 ) are substantially derivable with reduced eddy. Motor vehicle ( 10 ), comprising a body element according to one of claims 1 to 9.