DE102008016381A1 - Flow-optimized cross member - Google Patents
Flow-optimized cross member Download PDFInfo
- Publication number
- DE102008016381A1 DE102008016381A1 DE102008016381A DE102008016381A DE102008016381A1 DE 102008016381 A1 DE102008016381 A1 DE 102008016381A1 DE 102008016381 A DE102008016381 A DE 102008016381A DE 102008016381 A DE102008016381 A DE 102008016381A DE 102008016381 A1 DE102008016381 A1 DE 102008016381A1
- Authority
- DE
- Germany
- Prior art keywords
- cross member
- vehicle
- compressed air
- profile
- 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.)
- Granted
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Classifications
-
- 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
-
- 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
Landscapes
- 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) zumindest bereichsweise ein im Querschnitt stromlinienförmiges, insbesondere tropfen- oder tragflächenförmiges Profil (18) aufweist.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) at least partially a streamlined in cross section, in particular drop or having an airfoil-shaped profile (18).
Description
Die Erfindung betrifft einen strömungsoptimierten Querträger für ein Fahrgestell eines Nutzfahrzeugs nach dem Oberbegriff von Patentanspruch 1.The The invention relates to a flow-optimized crossbeam for a Chassis of a commercial vehicle according to the preamble of 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.bodies for commercial vehicles are generally designed as non-self-supporting bodies. The vehicle body and other suspension groups are doing on a frame mounted, which is usually designed as a ladder frame is. In this case, two longitudinal members running in the vehicle longitudinal direction are more than one Cross member together connected.
Solche Querträger sind dem Stand der Technik als allgemein bekannt zu entnehmen.Such crossbeam are to be found in the prior art as generally known.
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 as Round, rectangular or U-profile executed cross member while advantageous a high Bending stiffness, torsional elasticity and strength of the frame However, this construction method is still disadvantageous.
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 performance 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.Of the The present invention is therefore based on the object of providing a flow-optimized cross member, by the turbulence formations and an adverse air flow in the Driving operation of the vehicle can be avoided.
Diese Aufgabe wird gelöst durch einen Querträger mit den Merkmalen des Patentanspruchs 1.These Task is solved through a crossbeam with the features of 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.One such cross member consists of a basic body, extending in the vehicle transverse direction, and in its end regions is provided with mounting flanges, via which a fastening of the crossbeam to the longitudinal member of the vehicle frame he follows.
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 of the invention is Cross-sectional profile of the main body doing streamlined, in particular teardrop or airfoil-shaped, wherein the rejuvenating End of the profile in the vehicle longitudinal direction to the vehicle rear has. This is advantageous a uniform largely laminar flow around the crossbeam ensured while driving the vehicle and avoids 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 is the main body of the crossbeam designed as aluminum extruded profile. This allows a cost-effective production and combines low weight with 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 is the main body further formed as a hollow profile, wherein the terminal mounting flanges complete the internal cavity of the profile. Through the education of the the body as a hollow profile further weight can be saved without the appreciably affect 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 a cross member according to the invention is designed as a hollow profile body via a first opening compressed air fed. Furthermore, a second opening at the base body provided over which compressed air can be removed. Such a double function of the crossbeam as a mechanical support element and as compressed air storage for compressed air powered 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 suspension, to be provided.
Im Folgenden soll die Erfindung anhand der Zeichnungen ohne Beschränkung der Allgemeinheit näher erläutert werden, wobeiin the The invention is based on the drawings without limitation of Generality closer explained be, where
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 true DE102008016381A1 (en) | 2010-01-14 |
DE102008016381B4 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 |
---|---|
DE (1) | DE102008016381B4 (en) |
WO (1) | WO2009121446A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8967670B2 (en) | 2011-07-01 | 2015-03-03 | Audi Ag | Subframe with integrated pneumatic or hydraulic liquid vessel for the vehicle chassis of motor vehicles |
Families Citing this family (3)
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 |
FR3058094B1 (en) * | 2016-10-28 | 2018-12-07 | Renault S.A.S | ELEMENT FOR SUPPORTING EQUIPMENT OF A PNEUMATIC SUSPENSION OF A VEHICLE |
US20220176807A1 (en) * | 2019-06-19 | 2022-06-09 | 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 |
-
2008
- 2008-03-29 DE DE102008016381.3A patent/DE102008016381B4/en active Active
-
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 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8967670B2 (en) | 2011-07-01 | 2015-03-03 | Audi Ag | Subframe with integrated pneumatic or hydraulic liquid vessel for the vehicle chassis of motor vehicles |
Also Published As
Publication number | Publication date |
---|---|
DE102008016381B4 (en) | 2015-01-08 |
WO2009121446A1 (en) | 2009-10-08 |
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Legal Events
Date | Code | Title | Description |
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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 |
|
R081 | Change of applicant/patentee |
Owner name: DAIMLER TRUCK AG, DE Free format text: FORMER OWNER: DAIMLER AG, STUTTGART, DE |