WO1999029560A1 - Voiture particuliere comportant des elements pour reduire la resistance de l'air et les projections d'eau a l'arriere du vehicule - Google Patents

Voiture particuliere comportant des elements pour reduire la resistance de l'air et les projections d'eau a l'arriere du vehicule Download PDF

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Publication number
WO1999029560A1
WO1999029560A1 PCT/DE1998/003568 DE9803568W WO9929560A1 WO 1999029560 A1 WO1999029560 A1 WO 1999029560A1 DE 9803568 W DE9803568 W DE 9803568W WO 9929560 A1 WO9929560 A1 WO 9929560A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
underbody
vehicle
vehicle according
rear wheels
Prior art date
Application number
PCT/DE1998/003568
Other languages
German (de)
English (en)
Inventor
Anton Lechner
Original Assignee
Anton Lechner
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 Anton Lechner filed Critical Anton Lechner
Publication of WO1999029560A1 publication Critical patent/WO1999029560A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining
    • B62D35/007—Rear spoilers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining
    • B62D35/02—Streamlining the undersurfaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/82—Elements for improving aerodynamics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses

Definitions

  • Passenger car with means for reducing the rear drag and spray water.
  • the invention relates to a vehicle, in particular a passenger car, with means arranged behind the rear wheels for reducing the air resistance and spray water induced at the rear.
  • the reason for the induced pressure resistance that dominates the rear-side air resistance of a vehicle lies essentially in the separation of the flow at the roof edge and at the vehicle floor edge and the resulting typical flow vortex structure in the longitudinal median plane of the vehicle with two oppositely rotating vortices (see Fig. 1).
  • these vortices transport dirt and spray water from the street up into the dead water area behind the rear, causing the rear dirt and the unpleasant spray water plumes behind cars.
  • the larger lower main vortex (1) in particular is very energy-intensive and induces a strong negative pressure field on the rear surface.
  • Tail shapes are known with clear rear indentations of the side and roof walls or also various mechanical flaps or molded parts which taper the rear shape further backwards over the actual contour ("boat-tailing") and thereby reduce the vortex structure and reduce the air resistance however, they are only used to a limited extent because they reduce the useful space. Additional flaps and molded parts are complex and prone to failure. Spoilers are also attached to the roof edge or trunk edge, which ensure a defined stall and can also reduce the air resistance. Also known are devices, for example DE 3837 729, which have a favorable influence on the air resistance by blowing out or suctioning in the boundary layer of the rear flow. However, the additional mechanical and energy expenditure is also disadvantageous here.
  • DE-OS 2433 292 shows a vehicle with a rear spoiler behind the rear wheels, which the
  • the invention has for its object to provide means with which the induced air resistance can be reduced and the pollution of the rear of the vehicle and the water spray can be counteracted by influencing the rear swirl structure.
  • the solution to this problem according to the invention is based on the reduction and rearward displacement of the lower main vortex of the typical wake vortex structure by means of an underbody flow channel shaped according to the invention.
  • the combination of an underbody inclined upwards behind the rear wheels in a certain angular range (diffuser effect) and the further division of the flow into a lower, further upward flow and an upper flow with a smaller cross-sectional area proved to be very effective in experiments a flow channel in such a way that this upper flow is directed downward at the outlet in a certain angular range opposite to the lower underbody flow. It is important for the aerodynamic effect to conduct the underbody flow, particularly in the area of high flow speed (vehicle center), with the means according to the invention.
  • FIG. 1 shows the swirl structure at the rear in the middle section of a conventional vehicle
  • FIG. 2 shows that of a vehicle with means according to the invention
  • Fig. 3 is the rear view of a vehicle with means according to the invention.
  • 4 and 5 are sections through the lower rear of the vehicle in the longitudinal plane and show exemplary embodiments of the means according to the invention.
  • Fig. 1 it can be seen that the vortex structure behind the rear of the vehicle has a large, high-energy, left-turning lower main vortex (1), which results from the detachment of the underbody flow, and a smaller upper vortex, connected to the main vortex, ( 2) has.
  • the lower large vortex (1) is primarily responsible for the induced vacuum field at the rear.
  • the reason for the formation of this lower vortex is the speed difference between the roof (3) and underbody flow (6).
  • the underbody flow is faster than the roof flow and rolls up in a vortex.
  • Fig. 2 shows that by the means according to the invention the lower main vortex (1) is changed, i.e. is reduced as well as shifted backwards that the induced rear drag decreases.
  • the underbody (5) is pulled behind the rear wheel as smoothly and evenly as possible at the largest possible angle (16) so that the underbody flow can follow this flow channel (6) formed between the roadway and the underbody without detachment.
  • Lateral skirts (7) can advantageously keep the flow in this channel and prevent lateral eddies. Based on the law of continuity, it follows that in this flow channel the average flow speed and thus the difference in speed to the roof flow is reduced, ie the main vortex (1) becomes less energy and smaller.
  • the pressure on the sloping underbody wall (5) increases and the loss of momentum the underbody flow decreases.
  • the rear surface H 2 acted upon by the negative pressure is smaller than that (H 1) of a vehicle without means according to the invention, which likewise reduces the air resistance of the vehicle.
  • FIG. 5 shows a very simple construction of the means according to the invention.
  • the partition (8) was dispensed with.
  • the upper part of the underbody flow is only at the Underbody wall (5) deflected downwards at the end.
  • this form is structurally very simple, it is not quite as effective as the construction in FIG. 4.
  • the upper flow channel (9) has a bilateral air outlet (18), e.g. by pulling the upper flow channel (9) laterally around the stern, or by integrating an outlet opening in the side skirt (7), from which part of the underbody flow, e.g. is blown out obliquely outwards and downwards by means of known deflecting vanes and as a result the turbulent flow region is detected directly behind the rear wheels. This makes it possible to guide the spray water downwards and outwards away from the main vortex (1).
  • the rear bumper (12) and rear apron (17) can consist of two interconnected parts (Fig. 4) or even one part (12, Fig. 5). As shown in FIGS. 4 and 5, the channels (9) or wall surfaces (5) which serve to guide the flow of the upper underbody flow can be inexpensively molded into the rear apron or bumper.
  • a further advantage of the invention is that less dirt and spray water can get onto the rear surface due to the reduction as well as the displacement downstream of the rear vortex (1).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

Selon l'invention, les écoulements (6) produits au niveau du bas de caisse d'une voiture particulière, à l'arrière des roues arrière, sont divisés en deux canaux d'écoulement (9) et (10). L'écoulement inférieur (10) est dirigé vers le haut et l'écoulement supérieur (9) est dirigé tout d'abord vers le haut puis vers le bas. Les remous inférieurs (1) produits au niveau de la ligne de décollage à l'arrière du véhicule sont ainsi réduits et déplacés vers l'arrière, ce qui diminue la résistance de l'air à l'arrière du véhicule. De plus, les salissures et la traînée de sillage à l'arrière du véhicule sont également réduites.
PCT/DE1998/003568 1997-12-05 1998-12-04 Voiture particuliere comportant des elements pour reduire la resistance de l'air et les projections d'eau a l'arriere du vehicule WO1999029560A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29721562.0 1997-12-05
DE29721562U DE29721562U1 (de) 1997-12-05 1997-12-05 Fahrzeug mit Mitteln zur Verringerung des heckseitig induzierten Luftwiderstandes

Publications (1)

Publication Number Publication Date
WO1999029560A1 true WO1999029560A1 (fr) 1999-06-17

Family

ID=8049567

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/003568 WO1999029560A1 (fr) 1997-12-05 1998-12-04 Voiture particuliere comportant des elements pour reduire la resistance de l'air et les projections d'eau a l'arriere du vehicule

Country Status (2)

Country Link
DE (1) DE29721562U1 (fr)
WO (1) WO1999029560A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2885343A1 (fr) * 2005-05-03 2006-11-10 Peugeot Citroen Automobiles Sa Systeme de reduction des efforts aerodynamiques d'un vehicule automobile et vehicule automobile equipe d'un tel systeme
GB2403462B (en) * 2003-06-24 2007-07-04 John Edward Randell A land vehicle
DE102010008348A1 (de) * 2010-02-17 2011-10-06 Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) Fliessheck eines Personenkraftwagens
JP2013121743A (ja) * 2011-12-09 2013-06-20 Toyota Motor Corp 流体制御装置
WO2023144144A1 (fr) * 2022-01-26 2023-08-03 Gordon Murray Automotive Limited Aérodynamique de véhicule

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19961316B4 (de) * 1999-12-18 2006-02-23 Bayerische Motoren Werke Ag Kraftfahrzeug mit einer heckseitigen Luftumlenkeinrichtung
CN104129443B (zh) * 2014-07-29 2021-06-22 朱晓义 节能汽车
CN104149863A (zh) * 2014-08-25 2014-11-19 朱晓义 节能汽车
DE102020103196A1 (de) 2020-02-07 2021-08-12 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeug mit einer im Heckbereich vorgesehenen Unterbodenverkleidung
KR20230027168A (ko) * 2020-06-22 2023-02-27 아틀라스 테크놀로지스 홀딩 비.브이. 공기역학적 저항을 감소시키기 위한 하부 구조를 갖는 차량
DE102021102413A1 (de) 2021-02-03 2022-08-04 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923349A (en) * 1932-07-09 1933-08-22 Julia N Larson Vacuum breaker
US3591229A (en) * 1967-07-14 1971-07-06 Daimler Benz Ag Installation for reducing the soiling of rear lights or the like at motor vehicle bodies
DE2433292A1 (de) 1974-07-11 1976-01-22 Volkswagenwerk Ag Fahrzeug mit mitteln zur verringerung der verschmutzung seiner heckpartie
EP0738650A2 (fr) * 1995-04-19 1996-10-23 Politecnico Di Torino, Dipartimento Di Energetica Dispositif pour réduire la traînée aérodynamique des véhicules
DE19625739A1 (de) * 1995-07-03 1997-01-09 Anton Dr Lechner Vorrichtung zur Verringerung des Strömungswiderstandes und Spritzwassers eines Fahrzeuges, vorzugsweise Nutzfahrzeuges

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923349A (en) * 1932-07-09 1933-08-22 Julia N Larson Vacuum breaker
US3591229A (en) * 1967-07-14 1971-07-06 Daimler Benz Ag Installation for reducing the soiling of rear lights or the like at motor vehicle bodies
DE2433292A1 (de) 1974-07-11 1976-01-22 Volkswagenwerk Ag Fahrzeug mit mitteln zur verringerung der verschmutzung seiner heckpartie
EP0738650A2 (fr) * 1995-04-19 1996-10-23 Politecnico Di Torino, Dipartimento Di Energetica Dispositif pour réduire la traînée aérodynamique des véhicules
DE19625739A1 (de) * 1995-07-03 1997-01-09 Anton Dr Lechner Vorrichtung zur Verringerung des Strömungswiderstandes und Spritzwassers eines Fahrzeuges, vorzugsweise Nutzfahrzeuges

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2403462B (en) * 2003-06-24 2007-07-04 John Edward Randell A land vehicle
FR2885343A1 (fr) * 2005-05-03 2006-11-10 Peugeot Citroen Automobiles Sa Systeme de reduction des efforts aerodynamiques d'un vehicule automobile et vehicule automobile equipe d'un tel systeme
DE102010008348A1 (de) * 2010-02-17 2011-10-06 Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) Fliessheck eines Personenkraftwagens
US8360508B2 (en) 2010-02-17 2013-01-29 GM Global Technology Operations LLC Fastback for a passenger car
JP2013121743A (ja) * 2011-12-09 2013-06-20 Toyota Motor Corp 流体制御装置
WO2023144144A1 (fr) * 2022-01-26 2023-08-03 Gordon Murray Automotive Limited Aérodynamique de véhicule

Also Published As

Publication number Publication date
DE29721562U1 (de) 1998-02-19

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