DE102008016381B4 - Flow-optimized cross member - Google Patents
Flow-optimized cross member Download PDFInfo
- Publication number
- DE102008016381B4 DE102008016381B4 DE102008016381.3A DE102008016381A DE102008016381B4 DE 102008016381 B4 DE102008016381 B4 DE 102008016381B4 DE 102008016381 A DE102008016381 A DE 102008016381A DE 102008016381 B4 DE102008016381 B4 DE 102008016381B4
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- DE
- Germany
- Prior art keywords
- cross member
- vehicle
- profile
- compressed air
- basic 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D35/00—Vehicle bodies characterised by streamlining
- B62D35/005—Front spoilers
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Die Erfindung betrifft einen Querträger (10), insbesondere Frontquerträger, für einen Fahrzeugrahmen eines Nutzfahrzeugs, mit einem sich im Bereich zwischen Rahmenlängsträgern des Fahrzeugrahmens erstreckenden Grundkörper (12), wobei der Grundkörper (12) im Querschnitt betrachtet zumindest bereichsweise stromlinienförmig ausgebildet ist und dabei ein Profil (18) mit einem verjüngten Ende (20) aufweist und wobei das verjüngte Ende (20) in Einbaulage in Richtung der Fahrzeuglängsachse (22) zum hinteren Ende des Nutzfahrzeugs hin gerichtet ist.The invention relates to a cross member (10), in particular front cross member, for a vehicle frame of a commercial vehicle, with a base body (12) extending in the region between longitudinal frame members of the vehicle frame, wherein the base body (12) is at least partially streamlined viewed in cross section and a Profile (18) having a tapered end (20) and wherein the tapered end (20) in the installed position in the direction of the vehicle longitudinal axis (22) is directed towards the rear end of the utility vehicle.
Description
Die Erfindung betrifft einen strömungsoptimierten Querträger für ein Fahrgestell eines Nutzfahrzeugs nach dem Oberbegriff von Patentanspruch 1.The invention relates to a flow-optimized cross member for a chassis of a commercial vehicle according to the preamble of patent claim 1.
Karosserien für Nutzfahrzeuge werden im Allgemeinen als nicht selbsttragende Karosserien ausgelegt. Der Fahrzeugaufbau sowie weitere Fahrwerksgruppen werden dabei auf einen Rahmen montiert, welcher in der Regel als Leiterrahmen ausgebildet ist. Hierbei sind zwei in Fahrzeuglängsrichtung verlaufende Längsträger über mehrere Querträger miteinander verbunden.Commercial vehicle bodies are generally designed as non-self-supporting bodies. The vehicle body and other chassis groups are mounted on a frame, which is usually designed as a ladder frame. In this case, two longitudinal members running in the vehicle longitudinal direction are connected to one another via a plurality of cross members.
Solche Querträger sind dem Stand der Technik als allgemein bekannt zu entnehmen.Such cross members are known in the art as generally known.
Der
Während gängige als Rund-, Rechteck- oder U-Profil ausgeführte Querträger zwar vorteilhaft eine hohe Biegesteifigkeit, Verwindungselastizität und Tragkraft des Rahmens sicherstellen, ist diese Bauweise dennoch mit Nachteilen behaftet.While common designed as a round, rectangular or U-shaped cross member while advantageously ensure high bending stiffness, torsional elasticity and strength of the frame, this construction is still subject to disadvantages.
Insbesondere der an der Fahrzeugfront angebrachte Frontquerträger, welcher im Fahrbetrieb des Fahrzeuges direkt vom Fahrtwind angeströmt wird, verursacht in der gängigen Bauweise eine Verwirbelung dieses Luftstroms. Dies erhöht auf nachteilige Weise den Strömungswiderstandskoeffizienten CW des Fahrzeugs und führt dadurch zu einem unökonomisch erhöhten Kraftstoffverbrauch. Weiterhin reduziert eine solche Turbulenzbildung insbesondere am Frontquerträger auf in Längsrichtung des Fahrzeugs hinter dem Querträger angebrachte Komponenten gerichteten Luftstrom, insbesondere den Luftstrom auf den Kühlwasserkühler des Motorkühlsystems und den Motorraum im Allgemeinen. Dadurch wird die Kühlleistung des Motorkühlsystems verringert, weswegen aufwändige Maßnahmen zur Beaufschlagung des Kühlwasserkühlers mit zusätzlicher Luft ergriffen werden müssen.In particular, the attached at the front of the vehicle front cross member, which is directly impinged by the wind during driving of the vehicle caused in the current design, a turbulence of this air flow. This disadvantageously increases the flow resistance coefficient C W of the vehicle, thereby leading to uneconomically increased fuel consumption. Furthermore, such turbulence formation, in particular at the front cross member, reduces airflow directed at components mounted behind the cross member in the longitudinal direction of the vehicle, in particular the air flow onto the cooling water radiator of the engine cooling system and the engine compartment in general. As a result, the cooling capacity of the engine cooling system is reduced, which is why costly measures to act on the cooling water cooler with additional air must be taken.
Der vorliegenden Erfindung liegt also die Aufgabe zugrunde, einen strömungsoptimierten Querträger bereitzustellen, durch den Turbulenzbildungen und eine nachteilige Luftführung im Fahrbetrieb des Fahrzeugs vermieden werden.The present invention is therefore an object of the invention to provide a flow-optimized cross member, are avoided by the turbulence and a disadvantageous air flow when driving the vehicle.
Diese Aufgabe wird gelöst durch einen Querträger mit den Merkmalen des Patentanspruchs 1.This object is achieved by a cross member having the features of patent claim 1.
Ein solcher Querträger besteht aus einem Grundkörper, der sich in Fahrzeugquerrichtung erstreckt, und der in seinen Endbereichen mit Befestigungsflanschen versehen ist, über welche eine Befestigung des Querträgers an den Längsträger des Fahrzeugrahmens erfolgt.Such a cross member consists of a base body which extends in the vehicle transverse direction, and which is provided in its end regions with mounting flanges, via which an attachment of the cross member to the longitudinal member of the vehicle frame.
In der erfindungsgemäßen Ausführung ist das Querschnittsprofil des Grundkörpers dabei stromlinienförmig, insbesondere tropfen- oder tragflächenförmig ausgebildet, wobei das sich verjüngende Ende des Profils in Fahrzeuglängsrichtung zur Fahrzeugrückseite weist. Dadurch wird vorteilhaft eine gleichmäßige weitgehend laminare Umströmung des Querträgers im Fahrbetrieb des Fahrzeugs sichergestellt und Turbulenzen vermieden.In the embodiment according to the invention, the cross-sectional profile of the base body is streamlined, in particular teardrop or airfoil-shaped, with the tapered end of the profile facing the vehicle rear side in the vehicle longitudinal direction. As a result, it is advantageous to ensure a uniform, largely laminar flow around the cross member during the driving operation of the vehicle and to avoid turbulence.
In einer bevorzugten Ausführungsform ist der Grundkörper des Querträgers als Aluminiumstrangpressprofil ausgebildet. Dies ermöglicht eine kostengünstige Fertigung und verbindet geringes Gewicht mit einer hohen mechanischen Stabilität.In a preferred embodiment, the main body of the cross member is formed as an aluminum extruded profile. This allows a cost-effective production and combines low weight with a high mechanical stability.
In einer besonders bevorzugten Ausführungsform ist der Grundkörper weiterhin als Hohlprofil ausgebildet, wobei die endständigen Befestigungsflansche den inneren Hohlraum des Profils abschließen. Durch die Ausbildung des Grundkörpers als Hohlprofil kann weiteres Gewicht eingespart werden, ohne die mechanischen Eigenschaften des Querträgers nennenswert zu beeinträchtigen.In a particularly preferred embodiment, the base body is further formed as a hollow profile, wherein the terminal mounting flanges complete the inner cavity of the profile. By forming the body as a hollow profile further weight can be saved without significantly affecting the mechanical properties of the cross member.
In einer weiteren Ausführungsform eines erfindungsgemäßen Querträgers ist einem als Hohlprofil ausgebildeten Grundkörper über eine erste Öffnung Druckluft zuführbar. Weiterhin ist eine zweite Öffnung am Grundkörper vorgesehen, über welche Druckluft entnommen werden kann. Eine solche Doppelfunktion des Querträgers als mechanisches Stützelement und als Druckluftspeicher für druckluftbetriebene Systeme des Kraftfahrzeuges führt zu einer weiteren Gewichts- und Bauraumeinsparung. Insbesondere muss kein separater, Raum beanspruchender Druckluftspeicher, beispielsweise für eine Fahrerhausluftfederung, bereitgestellt werden.In a further embodiment of a cross member according to the invention, compressed air can be supplied to a base body designed as a hollow profile via a first opening. Furthermore, a second opening on the base body is provided, via which compressed air can be removed. Such a dual function of the cross member as a mechanical support element and as a compressed air reservoir for compressed air operated systems of the motor vehicle leads to a further weight and space savings. In particular, no separate, space-consuming compressed air storage, for example for a cab air suspension, must be provided.
Im Folgenden soll die Erfindung anhand der Zeichnungen ohne Beschränkung der Allgemeinheit näher erläutert werden, wobeiIn the following, the invention will be explained in more detail with reference to the drawings without limiting the generality, wherein
Ein im Ganzen mit
Der Grundkörper
Dadurch wird ein weitgehend ungehindertes Anströmen von in Fahrzeugrichtung hinter dem Frontquerträger gelegenen Komponenten ermöglicht, wie in
Der Grundkörper
Die Auslegung des Grundkörpers
Um einen erfindungsgemäßen Querträger auch als Druckluftspeicher nutzen zu können, sind am Grundkörper
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008016381.3A DE102008016381B4 (en) | 2008-03-29 | 2008-03-29 | Flow-optimized cross member |
PCT/EP2009/000528 WO2009121446A1 (en) | 2008-03-29 | 2009-01-28 | Flow-optimized crossbar |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008016381.3A DE102008016381B4 (en) | 2008-03-29 | 2008-03-29 | Flow-optimized cross member |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102008016381A1 DE102008016381A1 (en) | 2010-01-14 |
DE102008016381B4 true DE102008016381B4 (en) | 2015-01-08 |
Family
ID=40524532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102008016381.3A Active DE102008016381B4 (en) | 2008-03-29 | 2008-03-29 | Flow-optimized cross member |
Country Status (2)
Country | Link |
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DE (1) | DE102008016381B4 (en) |
WO (1) | WO2009121446A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2952342B1 (en) | 2009-11-12 | 2011-12-23 | Faurecia Bloc Avant | FRONT TRANSVERSAL BEAM FOR A MOTOR VEHICLE COMPRISING A REAR FAIRING ELEMENT |
DE102011106250A1 (en) | 2011-07-01 | 2013-01-03 | Audi Ag | Subframe for the vehicle chassis of motor vehicles |
FR3058094B1 (en) * | 2016-10-28 | 2018-12-07 | Renault S.A.S | ELEMENT FOR SUPPORTING EQUIPMENT OF A PNEUMATIC SUSPENSION OF A VEHICLE |
WO2020256717A1 (en) * | 2019-06-19 | 2020-12-24 | Volvo Truck Corporation | Aerodynamic front closing cross-member for road vehicle |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10139268A1 (en) * | 2001-08-09 | 2003-02-20 | Porsche Ag | Support structure for vehicle body has hollow profiled support with inner longitudinal web and curvature so that web can be stretched at connecting end through end expansion of profiled support |
EP1619107A2 (en) * | 2004-07-24 | 2006-01-25 | Dr.Ing. h.c.F. Porsche Aktiengesellschaft | Frame structure for vehicle chassis |
DE102006040073A1 (en) * | 2006-08-26 | 2008-02-28 | Daimler Ag | Hollow support useful in construction areas, comprises tube-shaped individual hollow profiles which are pushed into one another and fixed together by sliding connection at internal high pressure |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2859155B1 (en) * | 2003-08-25 | 2006-12-08 | Peugeot Citroen Automobiles Sa | MOTOR VEHICLE WITH DIRECTION RACK INTEGRATED IN THE FRONT CROSS |
US20050062251A1 (en) * | 2003-09-22 | 2005-03-24 | Ramsey John E. | Vehicle frame having air tank cross member |
DE102005029292A1 (en) * | 2005-04-13 | 2006-10-19 | Audi Ag | Sub frame for motor vehicle, has reinforcement with triangular framework connected at corners to side members and cross member |
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2008
- 2008-03-29 DE DE102008016381.3A patent/DE102008016381B4/en active Active
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2009
- 2009-01-28 WO PCT/EP2009/000528 patent/WO2009121446A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10139268A1 (en) * | 2001-08-09 | 2003-02-20 | Porsche Ag | Support structure for vehicle body has hollow profiled support with inner longitudinal web and curvature so that web can be stretched at connecting end through end expansion of profiled support |
EP1619107A2 (en) * | 2004-07-24 | 2006-01-25 | Dr.Ing. h.c.F. Porsche Aktiengesellschaft | Frame structure for vehicle chassis |
DE102006040073A1 (en) * | 2006-08-26 | 2008-02-28 | Daimler Ag | Hollow support useful in construction areas, comprises tube-shaped individual hollow profiles which are pushed into one another and fixed together by sliding connection at internal high pressure |
Also Published As
Publication number | Publication date |
---|---|
WO2009121446A1 (en) | 2009-10-08 |
DE102008016381A1 (en) | 2010-01-14 |
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OP8 | Request for examination as to paragraph 44 patent law | ||
R016 | Response to examination communication | ||
R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final | ||
R081 | Change of applicant/patentee |
Owner name: DAIMLER TRUCK AG, DE Free format text: FORMER OWNER: DAIMLER AG, 70327 STUTTGART, DE Owner name: DAIMLER AG, DE Free format text: FORMER OWNER: DAIMLER AG, 70327 STUTTGART, DE |
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R081 | Change of applicant/patentee |
Owner name: DAIMLER TRUCK AG, DE Free format text: FORMER OWNER: DAIMLER AG, STUTTGART, DE |