GB2341149A - Reinforced structural member for a motor vehicle - Google Patents

Reinforced structural member for a motor vehicle Download PDF

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Publication number
GB2341149A
GB2341149A GB9913898A GB9913898A GB2341149A GB 2341149 A GB2341149 A GB 2341149A GB 9913898 A GB9913898 A GB 9913898A GB 9913898 A GB9913898 A GB 9913898A GB 2341149 A GB2341149 A GB 2341149A
Authority
GB
United Kingdom
Prior art keywords
motor vehicle
vehicle longitudinal
enclosures
longitudinal
members
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.)
Withdrawn
Application number
GB9913898A
Other versions
GB9913898D0 (en
Inventor
Martin George Garrish
Clive Purslow
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.)
MG Rover Group Ltd
Original Assignee
MG Rover Group Ltd
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
Priority claimed from GBGB9814863.8A external-priority patent/GB9814863D0/en
Application filed by MG Rover Group Ltd filed Critical MG Rover Group Ltd
Priority to GB9913898A priority Critical patent/GB2341149A/en
Publication of GB9913898D0 publication Critical patent/GB9913898D0/en
Publication of GB2341149A publication Critical patent/GB2341149A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
    • 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
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B62D21/152—Front or rear frames
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/043—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the hollow cross-section comprising at least one enclosed cavity
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

A motor vehicle longitudinal 1, for use in a motor vehicle subassembly, comprising first 3 and second 2 portions, wherein reinforcing means are provided adjacent to, or as part of, one of said portions. The first of the portions 3 may be a hollow member, of generally inverse "T" shape (Fig 2), while the second 2, may comprise a generally inverse "U" shaped capping member portion. The two portions may be joined together to define enclosures 30 and 31 between them, the reinforcing means comprising those parts of the members defining the enclosures. In a second embodiment, the first portion (102, Fig 3) may comprise a "U" shaped member, while the second portion (103, Fig 3) may comprise a member, formed from longitudinal sheets (105 and 106, Fig 3), said sheets having oppositely disposed half circular impressions (107,108,109,110, Fig 3) running along their length, to form reinforcing enclosures (130 and 131, Fig 3).

Description

2341149 I=royed Structural Member The present invention relates to a
structural member for use in a motor vehicle subassembly and more particularly to a motor vehicle longitudinal of the kind adapted to absorb impacts directed along a longitudinal axis of a motor vehicle. Such motor vehicle longitudinals are sometimes also referred to as longitudinally extending load bearing 5 members.
In a motor vehicle longitudinal comprising a simple box section, most crash mechanisms occur through a localised collapsing of the motor vehicle longitudinal due to compression. In particular in the bending of the box sectioned motor vehicle longitudinal this collapse occurs at a point where a plastic hinge is formed. In such a box sectioned motor vehicle longitudinal an applied moment causes the top surface to be in compression while the bottom surface is in tension. In such a motor vehicle longitudinal the top surface and the bottom surface will be driven together. The side walls alone act to resist collapse. Beyond a given level, the side walls will collapse leading to a local catastrophic failure in the motor vehicle longitudinal. Beyond this level the motor vehicle longitudinal acts like a hinge and further resistance to bending is minimal. Accordingly following such a failure the motor vehicle longitudinal absorbs little. further energy.
An understanding of such a mechanism is important since such box sectioned motor vehicle longitudinals are commonly used in the construction of motor vehicle subassemblies. In particular, such motor vehicle longitudinals are used in the crumple zones of motor vehicles to absorb the energy of impact in the event of a collision. It is a problem, if, in attempting to absorb the energy of an impact, a motor vehicle longitudinal bends rather than crumples.
A graph illustrating the relationship between the angular displacement (x) applied to one end of such a box sectioned motor vehicle longitudinal, the other end being fted, and the applied moment (y) is shown in Figure 5. The area under the graph represents the energy absorbed by such a motor vehicle longitudinal.
The present invention has as an advantage that an increased bending moment may be applied before collapse of a motor vehicle longitudinal occurs. This in turn has the advantage 5 that more crash or impact energy is absorbed.
According to a first aspect of the invention, a motor vehicle longitudinal, for use in a motor vehicle, in which on applying a bending moment comprises a first portion in tension and a second portion in compression, is characterised in that reinforcing means adjacent to or comprising part of the second portion are provided within the motor vehicle longitudinal along at lest part of its length.
Preferably, the first portion is a base portion and the second portion is a capping portion.
More preferably, the first portion of the motor vehicle longitudinal comprises a hollow member of generally inverse "T" shaped section and the second portion comprises a generally inverse "U" shaped member, the first and second portions being joined together to define enclosures between the members, the reinforcing means comprising those parts of the members defining the enclosures.
Alternatively, the first portion may comprise a generally "U" shaped member and the second portion may comprise a member formed from longitudinal sheets, the sheets bearing impressions along their longitudinal length, joined at longitudinal edges to ends of the first portion. Preferably, oppositely disposed half circular impressions run along the length of the sheets of the second portion to form enclosures, the reinforcing means comprising those parts of the members defining the enclosures.
Conveniently, additional reinforcing members may be provided within the enclosures.
Conveniently, the reinforcing means may comprise tubular members disposed along the second portion.
The invention will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure I shows in cross-section a motor vehicle longitudinal according to a first embodiment of the present invention; Figure 2 shows in cross-section a motor vehicle longitudinal according to a second embodiment of the present invention; Figure 3 shows in cross-section a motor vehicle longitudinal according to a third embodiment of the present invention; Figure 4 shows in cross-section a motor vehicle longitudinal according to a forth embodiment of the present invention; Figure 5 shows a graph illustrating the relationship between the angular displacement (x) applied to one end of a simple box sectioned motor vehicle longitudinal, the other end being fixed, and the applied moment (y); and Figure 6 shows a graph illustrating the relationship between the angular displacement (x) applied to one end of a motor vehicle longitudinal according to the first embodiment of the present invention, the other end being fixed, and the applied moment (y).
Referring first to Figure 1, there is shown in cross-section a motor vehicle longitudinal 1 according to the present invention. Such a member has particular utility as a longitudinal member in a motor vehicle subassembly. The motor vehicle longitudinal comprises a first base member 2 and a second capping member 3.
The first member 2 has oppositely disposed side walls 22,23, a base wall 24 and an upper wall 25,26. A central member 20 extends from the upper wall 25,26. The central member 20 has oppositely disposed side walls 27, 28 and an upper wall 29. The first member may conveniently be formed from extruded aluminium and subsequently shaped by hydroforming.
The second member 3 is of inverted generally "U" shaped configuration, having two side members 5,6 and a base member 7. The base member 7 has a groove 8 running along its 5 base. The groove has oppositely disposed side walls 9, 10 and a base portion 12. The second 1 member may conveniently be formed from extruded aluminium.
In use, the first base member and the second capping member are disposed such that the side walls 5,6 of the second capping member abut the side walls 22,23 of the first base member and the base 12 of the groove in the second capping member abuts the upper wall 29 of the ceniral member of the first base member. The first and second members are securely joined to one another at these regions. Conveniently, this may be achieved by welding of the joints. Connecting the first and second members together in this way leads to the formation of enclosures or passages 30,31 running along the length of the motor vehicle longitudinal 1.
This structure has an improved resistance to bending in comparison to known box sectioned motor vehicle longitudinals. This may be seen by comparing the graph of Figure 5 with the graph of Figure 6. Figure 6 shows a graph illustrating the relationship between the angular displacement (x) applied to one end of the motor vehicle longitudinal shown in Figure 1, the other end being fixed, and the applied moment (y). The area under the graph represents the energy absorbed by such a motor vehicle longitudinal. It can be seen that the area under the graph of Figure 6 is greater than the area under the graph of Figure 5, showing that a motor vehicle longitudinal according to the present invention absorbs more energy than a known simple box sectioned motor vehicle longitudinal.
Referring to Figure 2, there is shown a similar structure to Figure 1. Like reference numerals have been used to refer to like parts. It can be seen that the side walls 27,28 of the central member are longer with respect to the overall height h of the section than in the embodiment of Figure 1. The upper walls 25,26 are also longer with respect to the width w of the section than in the embodiment of Figure 1. It is believed that these walls may each be up to 25% of their respective overall dimensions h, w without adversely affecting the performance of the invention.
In addition, this embodiment shows the presence of reinforcing elements 40,41 within the enclosures 30,31. The reinforcing elements 40,41 are of generally "L" shaped configuration. The reinforcements 40,41 may conveniently be connected to the capping member 3, for example by welding, prior to assembly of the structural element.
Turning now to Figure 3, a further embodiment of the invention is shown in cross section. this embodiment may be formed from pressed sheets, rather than extruded sections.
The motor vehicle longitudinal 101 comprises a first base member 102 and a second capping member 103.
The first member 102 has oppositely disposed side walls 122,123, extending upwards from a base wall 124. The side walls 122,123 are each provided with outwardly extending flanges 125,126.
The second member 103 comprises longitudinal sheets 105,106, the sheets bearing impressions 107,108,109,110 along their longitudinal length. 71e impressions are half circular in form and oppositely disposed to one another to from enclosures 130,131. The sheets are joined to one another along longitudinal edges 111,112,113,114 to form longitudinal edges of the second member and along a longitudinal region 115, 116 between the impressions. The second member is joined at its longitudinal edges to the flanges 125,126 of the first portion.
A baffle 140 is disposed between the first and second portions. A first flange 141 on a first end of the baffle is joined to the base of the first portion. A second flange 142 at a second end of the baffle is joined to the longitudinal region 115 of the lower of the plates 105 of the second portion 103.
Conveniently, the joining of the various parts may be achieved by welding.
A further embodiment of the present invention is shown in Figure 4. A motor vehicle longitudinal 201 comprises a first base member 202 and a second capping member 203.
The first member 202 is of generally "U" shaped configuration, having two side members 222,223 and a base member 224.
The second member 203 is of generally inverted "U" shaped configuration, having two 1 side members 205,206 and a base member 207. Between each side wall and the base member there is secured a tubular member 250,251. By the use of hydroforming techniques the tubular member can be of any convenient shaped section, including square.
The side walls of the first and second portions are joined to one another. Conveniently, this may be achieved by welding.

Claims (8)

1. A motor vehicle longitudinal, for use in a motor vehicle, in which on applying a bending moment comprises a first portion in tension and a second portion in compression, characterised in that reinforcing means adjacent to or comprising part of the second portion are provided within the motor vehicle longitudinal along at least part of its length.
2. A motor vehicle longitudinal according to claim 1, characterised in that the first portion is a base portion and the second portion is a capping portion.
3. A motor vehicle longitudinal according to either claim 1 or claim 2, characterised in that the first portion of the motor vehicle longitudinal comprises a hollow member of generally inverse "T" shaped section and the second portion comprises a generally inverse "U" shaped member, the first and second portions being joined together to define enclosures between the members, the reinforcing means comprising those parts of the members defining the enclosures.
4. A motor vehicle longitudinal according to claim 1 or claim 2, characterised in that the first portion may comprise a generally "U" shaped member and the second portion may comprise a member formed from longitudinal sheets, the sheets bearing impressions along their longitudinal length, joined at longitudinal edges to ends of the first portion.
5. A motor vehicle longitudinal according to claim 4, characterised in that oppositely disposed half circular impressions run along the length of the sheets of the second portion to forTn'enclosures, the reinforcing means comprising those parts of the members defining the enclosures.
6. A motor vehicle longitudinal according to claim 3 or claim 5, characterised in that additional reinforcing members may be provided within the enclosures.
7. A motor vehicle longitudinal according claim 1 or claim 2, characterised in that the reinforcing means may comprise tubular members disposed along the second portion.
8. A motor vehicle longitudinal for use in a motor vehicle subassembly substantially as described herein with reference to and as illustrated in any of Figures 1 to 3 of the accompanying drawings.
GB9913898A 1998-07-10 1999-06-16 Reinforced structural member for a motor vehicle Withdrawn GB2341149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9913898A GB2341149A (en) 1998-07-10 1999-06-16 Reinforced structural member for a motor vehicle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9814863.8A GB9814863D0 (en) 1998-07-10 1998-07-10 Improved structural member
GB9913898A GB2341149A (en) 1998-07-10 1999-06-16 Reinforced structural member for a motor vehicle

Publications (2)

Publication Number Publication Date
GB9913898D0 GB9913898D0 (en) 1999-08-18
GB2341149A true GB2341149A (en) 2000-03-08

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Family Applications (1)

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GB9913898A Withdrawn GB2341149A (en) 1998-07-10 1999-06-16 Reinforced structural member for a motor vehicle

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10126065C2 (en) * 2000-05-29 2003-10-30 Benteler Werke Ag deformation element
EP1378421A1 (en) * 2002-07-02 2004-01-07 Dana Corporation Closed channel structural member having internal reinforcement for vehicle body and frame assembly
WO2004062988A1 (en) * 2003-01-15 2004-07-29 Bayerische Motoren Werke Longitudinal beam for a vehicle
EP1440868A3 (en) * 2003-01-24 2004-10-06 Nissan Motor Company, Limited Vehicular body front structure
WO2006036065A1 (en) * 2004-09-27 2006-04-06 Norsk Hydro Asa Energy absorbing member and method for making an energy absorbing member
EP1829752A1 (en) * 2006-03-02 2007-09-05 Wagon Automotive GmbH Crash box
WO2008043480A1 (en) * 2006-10-12 2008-04-17 Magna Automotive Services Gmbh Energy absorption device, especially for non-axial loads
DE102012111671A1 (en) * 2012-11-30 2014-06-05 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Reinforcement carrier for installation in longitudinal beam of front end of motor vehicle, is formed as square tube, and has corrugation at its front end area, where corrugation bates side wall of square tube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007898A (en) * 1931-09-30 1935-07-09 Budd Edward G Mfg Co Sheet metal structure
GB1517922A (en) * 1974-07-25 1978-07-19 Mannesmann Roehren Werke Ag Reinforcing element
US5100189A (en) * 1989-06-22 1992-03-31 Nissan Motor Company, Limited Structure for absorbing collision impact
WO1998014285A1 (en) * 1996-10-01 1998-04-09 Hydro Raufoss Automotive A/S Method for manufacturing a structural member
JPH1099919A (en) * 1996-09-26 1998-04-21 Kobe Steel Ltd Extruded material of aluminum or aluminum alloy for bending
EP0894698A2 (en) * 1997-07-31 1999-02-03 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Frame crossbeam for vehicles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007898A (en) * 1931-09-30 1935-07-09 Budd Edward G Mfg Co Sheet metal structure
GB1517922A (en) * 1974-07-25 1978-07-19 Mannesmann Roehren Werke Ag Reinforcing element
US5100189A (en) * 1989-06-22 1992-03-31 Nissan Motor Company, Limited Structure for absorbing collision impact
JPH1099919A (en) * 1996-09-26 1998-04-21 Kobe Steel Ltd Extruded material of aluminum or aluminum alloy for bending
WO1998014285A1 (en) * 1996-10-01 1998-04-09 Hydro Raufoss Automotive A/S Method for manufacturing a structural member
EP0894698A2 (en) * 1997-07-31 1999-02-03 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Frame crossbeam for vehicles

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10126065C2 (en) * 2000-05-29 2003-10-30 Benteler Werke Ag deformation element
EP1378421A1 (en) * 2002-07-02 2004-01-07 Dana Corporation Closed channel structural member having internal reinforcement for vehicle body and frame assembly
US6733040B1 (en) 2002-07-02 2004-05-11 Dana Corporation Closed channel structural member having internal reinforcement for vehicle body and frame assembly
JP2006515244A (en) * 2003-01-15 2006-05-25 バイエリッシェ　モートーレン　ウエルケ　アクチエンゲゼルシャフト Vertical beam for vehicles
WO2004062988A1 (en) * 2003-01-15 2004-07-29 Bayerische Motoren Werke Longitudinal beam for a vehicle
US7654002B2 (en) 2003-01-15 2010-02-02 Bayerische Motoren Werke Aktiengesellschaft Side member for a vehicle
EP1440868A3 (en) * 2003-01-24 2004-10-06 Nissan Motor Company, Limited Vehicular body front structure
CN100395142C (en) * 2003-01-24 2008-06-18 日产自动车株式会社 Front structure of vehicle body
US6929314B2 (en) 2003-01-24 2005-08-16 Nissan Motor Co., Ltd. Vehicular body front structure
WO2006036065A1 (en) * 2004-09-27 2006-04-06 Norsk Hydro Asa Energy absorbing member and method for making an energy absorbing member
EP1829752A1 (en) * 2006-03-02 2007-09-05 Wagon Automotive GmbH Crash box
EP1829753A1 (en) * 2006-03-02 2007-09-05 Wagon Automotive GmbH Crash box
WO2008043480A1 (en) * 2006-10-12 2008-04-17 Magna Automotive Services Gmbh Energy absorption device, especially for non-axial loads
US8047588B2 (en) 2006-10-12 2011-11-01 Magna Automotive Services Gmbh Energy absorption device, especially for non-axial loads
US8308207B2 (en) 2006-10-12 2012-11-13 Magna Automotive Services Gmbh Energy absorption device, especially for non-axial loads
DE102012111671A1 (en) * 2012-11-30 2014-06-05 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Reinforcement carrier for installation in longitudinal beam of front end of motor vehicle, is formed as square tube, and has corrugation at its front end area, where corrugation bates side wall of square tube

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