DE102017012266A1 - Air guiding means for a motor vehicle - Google Patents

Air guiding means for a motor vehicle

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Publication number
DE102017012266A1
DE102017012266A1 DE102017012266.0A DE102017012266A DE102017012266A1 DE 102017012266 A1 DE102017012266 A1 DE 102017012266A1 DE 102017012266 A DE102017012266 A DE 102017012266A DE 102017012266 A1 DE102017012266 A1 DE 102017012266A1
Authority
DE
Germany
Prior art keywords
guiding means
motor vehicle
air guiding
height
base body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE102017012266.0A
Other languages
German (de)
Inventor
Michael Preiss
Matthias Braun
Benjamin Bernard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Porsche SE
Original Assignee
Porsche SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Porsche SE filed Critical Porsche SE
Priority to DE102017012266.0A priority Critical patent/DE102017012266A1/en
Publication of DE102017012266A1 publication Critical patent/DE102017012266A1/en
Application status is Pending legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D35/00Vehicle bodies characterised by streamlining

Abstract

The invention relates to an air-guiding means for a motor vehicle, wherein the air-guiding means comprises a base body (100; 200) which is designed to guide an air flow occurring during normal operation of the motor vehicle, wherein the base body (100; 200) is in the state fastened to the motor vehicle has a continuously changing in the transverse direction of the motor vehicle height (R), and / or is provided with swirling elements (201).

Description

  • The invention relates to an air-guiding means for a motor vehicle according to the preamble of claim 1.
  • From the prior art, such air guiding means are also known as wings or spoilers. The JP 5303598 B2 discloses a spoiler in the rear of a motor vehicle with a concave profile. In the transverse direction of the motor vehicle also changes the height of the spoiler.
  • Spoilers or wings may be a ride-dependent noise source. The reason for this is regularly pulsating flow separation, which can form on the spoiler or wing. Often at the trailing edge of the spoiler or the wing vortex. By interacting with the vehicle structure, the resulting noise is transmitted to the passenger compartment of the motor vehicle.
  • From the prior art, various measures are known to reduce this noise. The DE 100 28 178 A1 and the EP 0 273 850 B1 disclose turbulators in the form of several nozzle-like channels. It is also known to change the height of the spoiler over its length. The already known possibilities for reducing noise are limited by manufacturability, design and legislation.
  • Therefore, the present invention has the object to provide further possibilities for reducing noise occurring in the operation of the motor vehicle in the case of air conduction.
  • This object is achieved by an air-guiding device according to claim 1. Embodiments of the invention are indicated in the dependent claims.
  • The air guiding means comprises a base body, which is designed to guide a flow of air occurring during intended use of the motor vehicle. Under the intended operation of the motor vehicle is understood in the context of this description, in particular a ride in the forward direction of the motor vehicle.
  • In the state of the device fastened to the motor vehicle, the main body can have a height which changes continuously in the transverse direction of the motor vehicle. In the context of this description, the height of the base body is understood to mean the dimension of the base body in the vertical direction of the motor vehicle.
  • By this construction of the body, the regularity of the flow separation is reduced or avoided on the body, creating less noise.
  • The air guiding means comprises, preferably arranged on the body, swirling elements. These are designed to cause turbulence in the guided from the body air flow. The swirling elements can be arranged spaced from one another in the vehicle-mounted state of the device in the transverse direction of the motor vehicle. Between the turbulators interspaces are arranged which expand or narrow in the direction of flow of the air flow downstream. When the motor vehicle is used as intended, the flow direction along the longitudinal axis of the motor vehicle runs in the direction of the rear of the motor vehicle.
  • In the context of this description, the widening of the intermediate spaces is understood in particular to mean that the intermediate spaces in the transverse direction of the motor vehicle become larger. In the context of this description, the narrowing of the intermediate spaces is understood in particular to mean that the intermediate spaces in the transverse direction of the motor vehicle become smaller.
  • The swirling elements with the widening interspaces are particularly effective, since-viewed in the flow direction of the air flow-a flow separation is generated at the beginning of the intermediate spaces at the side edges of the interspaces, so that an additional negative pressure is generated in each of the interspaces by edge swirls. The air currents are escorted through the gaps by the edge vortices. Therefore, the edge vortexes have a disturbing influence on the regularly pulsating flow separation at the base body, whereby noise is reduced.
  • The Verwirbelungselemente with the narrowing spaces are particularly effective, since the flow is locally accelerated by the narrowing spaces, so behind these spaces there is a faster air jet than in the areas of normal outflow. These disturbing currents have a disturbing influence on the regularly pulsating flow separation at the base body, whereby noise is reduced.
  • It is particularly advantageous if the swirling elements are arranged in a region on the base body, in which the base body in longitudinal section has a relatively small gradient of the height change.
  • According to one embodiment of the invention, the swirling elements can be arranged in a rear of the base body in a state of the air guiding means fastened to the motor vehicle. The rear area may be in particular the rear half of the main body in the direction of travel of the motor vehicle. In particular, it is advantageous if the rear region comprises only the rear third or the rear quarter of the main body. This further reduces the noise, since the regularly pulsating flow separation is disturbed on the body more effectively.
  • According to one embodiment of the invention, the swirling elements may be arranged on a surface of the air guiding means which is directed upwards in the vehicle-mounted state of the air-guiding means.
  • According to one embodiment of the invention, the swirling elements may be arranged on a surface of the air guiding means directed downwards in the vehicle-mounted state of the air-guiding means. This arrangement is particularly advantageous for optical reasons, since this surface is usually less visible.
  • According to one embodiment of the invention, the interstices may continuously expand in a first region and have a constant width in a second region. The second region is arranged downstream in the Ahströmrichtung the air flow from the first region. In this way, a particularly good effect of the gaps is achieved to reduce the noise. Preferably, the first region extends over more than half the length of the swirl elements.
  • It is also possible that the first area comprises two partial areas. The intermediate spaces in the first subarea can expand less strongly than in the second subarea. In the context of this description, the extent of widening is understood to be, in particular, the widening of the intermediate spaces per unit length.
  • According to one embodiment of the invention, the turbulence elements can each have a height which amounts to at least a quarter of the height of the base body. Experiments have shown that this is particularly advantageous in order to reduce unwanted noise.
  • According to one embodiment of the invention, the swirling elements may each have a length which is 1.5 times to 2.5 times the height of the base body. Experiments have shown that this is particularly advantageous in order to reduce unwanted noise. In this context, the term "length" is understood to mean the extent of the turbulence elements in the longitudinal direction of the motor vehicle in the state of the device fastened to the motor vehicle.
  • According to one embodiment of the invention, the gaps may widen from a width between one fifth and one third of the height of the base body to a width between 1.5 times and twice the height of the base body. Experiments have shown that this is particularly advantageous in order to reduce unwanted noise.
  • According to one embodiment of the invention, the swirling elements can each have a width between 1.5 times and 2.5 times the height of the base body. Experiments have shown that this is particularly advantageous in order to reduce unwanted noise.
  • According to one embodiment of the invention, the swirling elements may have different distances from one another, different heights, different lengths and / or different widths. Experiments have shown that this is particularly advantageous in order to reduce unwanted noise.
  • The air guiding means may be adapted to direct the flow of air so that a downward force acts on the air guiding means. This force can improve the handling of the motor vehicle, especially when cornering.
  • The motor vehicle according to claim 10 comprises an air guiding device according to an embodiment of the invention, in which the turbulence elements are arranged outside the main body of the wing or spoiler on the motor vehicle in a projection region. This projection area is defined by a vertical geometric projection of turbulence elements on a body of the motor vehicle.
  • Further features and advantages of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. The same reference numerals are used for the same or similar components and components with the same or similar functions.
    • 1 shows a schematic front view of a body with a continuously changing in the transverse direction of the motor vehicle height.
    • 2 shows a schematic perspective view of an underside of a base body arranged thereon with swirling elements.
    • 3 shows a schematic plan view of the Verwirbelungselemente 2 ,
    • 4 shows a schematic side view of the body 2 ,
    • 5 shows a schematic perspective view of an underside of a base body arranged thereon with swirling elements.
    • 6 shows a schematic plan view of the Verwirbelungselemente 5 ,
  • The in 1 illustrated basic body 100 indicates one over its width b G changing height R on. The width b G is the dimension that extends in the state attached to the motor vehicle in the transverse direction of the motor vehicle. The height R changes over the entire width b G continuously. In the middle, the base body 100 the lowest height R and at its outer ends the greatest height R on. This form has been found in experiments to be particularly advantageous to reduce noise.
  • The in the 2 to 4 illustrated basic body 200 has swirling elements on its underside 201 with intermediate spaces between them 202 on. The gaps 202 are in the transverse direction of the motor vehicle between the turbulators 201 arranged.
  • In the direction of flow A the occurring during normal operation of the motor vehicle air flow have the Verwirbelungselemente 201 in their width b V a tapered shape. The gaps 202 between the turbulators 201 thus expand downstream in the direction of flow A.
  • By such swirling elements 201 and spaces 202 arise in the direction of flow A downstream at the beginning of the interstices 202 at the side edges of the spaces 202 Flow separation, so in each of the spaces 202 An additional negative pressure is generated by edge vortex. Due to the edge vortex, the air flow through the interstices 202 escorted. The edge vortices have a disturbing influence on the regularly pulsating flow separation at the base body 200 , which reduces noise.
  • The change in the width bv of the swirling elements 201 and the spaces between 202 takes place in a first, front mounted on the motor vehicle state, area continuously. In a second, rear mounted in the motor vehicle state, the area remains bv of the swirling elements 201 and the spaces between 202 constant.
  • In the first area is the reduction of the width bv of the swirling elements 201 in the direction of flow A stronger in a first subarea than in an adjoining second subarea. The first subregion comprises the front end of the swirling elements 201 , The second subarea follows the first subarea. The second area is followed by the second area.
  • The in the 2 to 4 illustrated shape of the swirling elements 201 has been found in experiments to be particularly well suited to reduce noise in the vehicle. It is particularly advantageous if the turbulence elements 201 with the in 1 shown change in the height of the body 100 be combined.
  • In the 5 and 6 is another embodiment of the swirling elements 201 shown. These too can, as in 4 shown at the bottom of the body 200 be arranged.
  • The turbulence elements 201 from the 5 and 6 Essentially differ from those of the 2 to 4 in that the gap 202 between the turbulators 201 in the direction of flow A narrows. By such swirling elements 201 and spaces 202 The flow is accelerated locally, leaving behind these gaps 202 a faster air jet is present than in the areas of normal outflow. These disturbing currents have a disturbing influence on the regularly pulsating flow separation at the base body 200 , which reduces noise. This form has been found in experiments to be particularly advantageous for a reduction of noise in the motor vehicle. It is particularly advantageous if the turbulence elements 201 with the in 1 shown change in the height of the body 100 be combined.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely 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.
  • Cited patent literature
    • JP 5303598 B2 [0002]
    • DE 10028178 A1 [0004]
    • EP 0273850 B1 [0004]

Claims (6)

  1. Air guiding means for a motor vehicle, wherein the air guiding means comprises a base body (100, 200) adapted to conduct an air flow occurring during normal operation of the motor vehicle, wherein the air guiding means comprises turbulence elements (201), which are adapted to turbulence in the To cause air flow, the Verwirbelungselemente (201) are arranged spaced apart in the vehicle-mounted state in the transverse direction of the motor vehicle, so that intermediate spaces (202) between the Verwirbelungselementen (201) are arranged, characterized in that the intermediate spaces (202) in the Flow direction (A) downstream of the air flow is from a width between one fifth and one third of the height (R) of the base body (100; 200) to a width between 1.5 times and twice the height of the base body (100; 200) or that the gaps (202) are of a width between 1.9 and 2.3 times the height (R) of the main body (100; 200) narrow to a width between one third and one fifth of the height (R) of the main body (100, 200).
  2. Air guiding means according to the preceding claim, characterized in that the swirling elements (201) are arranged in a rear region of the base body (100; 200) in a state of the air guiding means fixed to the motor vehicle.
  3. Air guiding means according to one of the two preceding claims, characterized in that the swirling elements (201) are arranged on a surface of the air guiding means directed downwards or upwards in the state of the air guiding means fixed to the motor vehicle.
  4. Air guiding means according to at least one of the three preceding claims, characterized in that the swirling elements (201) each have a height that is at least a quarter of the height (R) of the base body (100; 200), and / or that the swirling elements (201) each have a length which is 1.5 times to 2.5 times the height (R) of the main body (100, 200).
  5. Air guiding means according to at least one of the four preceding claims, characterized in that the swirling elements (201) each have a width (b V ) between 1.5 times and 2.5 times the height (R) of the base body.
  6. Air guiding means according to at least one of the previous five claims, characterized in that the swirling elements (201) are arranged at different distances from each other and / or that the swirling elements have different widths, heights and / or lengths.
DE102017012266.0A 2017-12-13 2017-12-13 Air guiding means for a motor vehicle Pending DE102017012266A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102017012266.0A DE102017012266A1 (en) 2017-12-13 2017-12-13 Air guiding means for a motor vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017012266.0A DE102017012266A1 (en) 2017-12-13 2017-12-13 Air guiding means for a motor vehicle

Publications (1)

Publication Number Publication Date
DE102017012266A1 true DE102017012266A1 (en) 2019-06-13

Family

ID=66629455

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102017012266.0A Pending DE102017012266A1 (en) 2017-12-13 2017-12-13 Air guiding means for a motor vehicle

Country Status (1)

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DE (1) DE102017012266A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273850A2 (en) 1986-12-29 1988-07-06 United Technologies Corporation Bodies with reduced base drag
DE10028178A1 (en) 2000-06-09 2001-12-13 Helmut Obieglo Racing car spoiler design opts for triangular segmental surface curved multi-dimensionally and tapered against flow having topside convex and underside concave surface sectors.
JP5303598B2 (en) 2011-03-30 2013-10-02 本田技研工業株式会社 Body side structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273850A2 (en) 1986-12-29 1988-07-06 United Technologies Corporation Bodies with reduced base drag
DE10028178A1 (en) 2000-06-09 2001-12-13 Helmut Obieglo Racing car spoiler design opts for triangular segmental surface curved multi-dimensionally and tapered against flow having topside convex and underside concave surface sectors.
JP5303598B2 (en) 2011-03-30 2013-10-02 本田技研工業株式会社 Body side structure

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