WO2005080141A1 - A bumper beam for a vehicle - Google Patents

A bumper beam for a vehicle Download PDF

Info

Publication number
WO2005080141A1
WO2005080141A1 PCT/SE2005/000211 SE2005000211W WO2005080141A1 WO 2005080141 A1 WO2005080141 A1 WO 2005080141A1 SE 2005000211 W SE2005000211 W SE 2005000211W WO 2005080141 A1 WO2005080141 A1 WO 2005080141A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
bumper beam
outer profile
webs
beam according
Prior art date
Application number
PCT/SE2005/000211
Other languages
French (fr)
Inventor
Simon Tornberg
Original Assignee
Gestamp Hardtech Ab
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 Gestamp Hardtech Ab filed Critical Gestamp Hardtech Ab
Priority to JP2007500710A priority Critical patent/JP2007523797A/en
Priority to DE602005004514T priority patent/DE602005004514T2/en
Priority to US10/589,925 priority patent/US7611175B2/en
Priority to EP05711071A priority patent/EP1723008B1/en
Publication of WO2005080141A1 publication Critical patent/WO2005080141A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/1806—Structural beams therefor, e.g. shock-absorbing
    • B60R2019/1813—Structural beams therefor, e.g. shock-absorbing made of metal

Definitions

  • This invention relates to a bumper beam for a vehicle, comprising an outer profile with a bow-formed central flange and two webs and a cover that provides a closed profile, the outer profile being adapted to be fastened with its central flange facing outwards from the vehicle.
  • a bumper beam that has good properties for various kinds of barrier crashes may be bad for a collision with a pole at a low velocity.
  • One of the most common accidents involving a rear bumper beam, for example, is the crash against a lamp post on a parking lot.
  • the bumper beam will collapse locally and fold.
  • Figure 1 is a top view of a bumper beam.
  • Figure 2 is a side view of the same bumper beam as seen from inside the vehicle.
  • Figure 3 is a section taken along line 3-3 in figure 1.
  • Figure 4 is an enlargement of a portion of figure 1.
  • Figure 5 is a perspective view of one of the parts that make up the bumper beam of the preceding figures.
  • Figure 1 shows, as seen from above, a bumper beam 11 of steel symmetrically fastened in two crash boxes 13, only one of which being illustrated and only schematically.
  • the bumper beam is made up of an outer profile in the form of a bow-formed beam 14 and a cover 15.
  • the outer profile is a hat profile as shown in figure 3 with a central flange 16 and two webs 17,18 that end in side flanges 19,20.
  • the central portion of the central flange may have a longitudinal stiffener 21 , the depth of which decreases from its centre so that it ends at 22.
  • the cover 15 is also in the form of a hat profile with a central flange 24 and two webs 25,26 that end in side flanges 27,28.
  • the webs of the two hat beams are united by welds.
  • the webs can be directly welded together or alternatively, they can be united by having their side flanges 19,20; 27,28 welded together as illustrated.
  • the sheet thickness of the cover is less than the sheet thickness of the outer profile.
  • the steel of the cover may also have lower yield strength than the steel of the outer profile.
  • the outer profile can suitably be press-hardened, that is, hot stamped and hardened in the same tools in one operation, whereas the cover can suitably be cold formed from cold-forming sheet steel.
  • the outer profile may have a sheet thickness of 2 mm and a yield strength of about 1150 MPa or more, whereas the cover may have a considerably less sheet thickness and a yield strength of less than % of the yield strength of the outer profile, for example about half the strength.
  • the sheet thickness of the cover may suitably be at most 3 ⁇ of the thickness of the outer profile.
  • the cover 15, that is, the inner profile, is shown in perspective as figure 5. Its webs 25,26 has transverse stiffeners 23 and the height of the webs reduces continuously so that the cover ends a flat sheet.
  • the crash boxes 13 have a fastening plate 29 with holes for screws so that they can be screwed to a supporting portion of the vehicle. They have a fastening plate 30 as well in which the outer profile is fastened, preferably being welded thereto.
  • the plate 30 has a portion 31 , which is bent outwards and under which the flat end of the cover extends and is welded to the portion 31 so that tension forces can be transmitted between the plate 30 and the cover.
  • the cover may extend under the entire plate 30 and be welded both to the plate and to the outer profile.
  • the outer profile 14 is fastened in the crash boxes, either directly or indirectly with the cover inbetween. Since the cover may be made of comparatively thin sheet, its fastening to the crash boxes may be too weak in the absence of the plate 30 and such a plate 30 is therefore preferred.
  • the central flange 24 of the cover has linear extension between the crash boxes and the depth of the bumper beam at its middle is larger than its depth at its fastening portions.
  • the depth relation should be at least 130% or rather at least 160%.
  • the central flange 24 of the cover takes the tension load when the outer profile hits for example a post and it reduces the risk of local collapsing of the outer profile 14. Instead of collapsing, the bumper beam will have a dent. If the tension load would not be taken up, the outer profile 14 would tend to straighten out and bend the crash boxes outwards. At high a collision load, the crash boxes would bend outwards from each other and then, they could not deform as intended and could therefore not take up energy as intended.
  • the central flange of the cover need not be exactly linear in order to take up tension load well. It should, however, be substantially linear, and a bow form with a pitch of a few cm has a minor effect on the capability of taking up tension load.
  • the depth of the outer profile increases continuously from the centre of the bumper beam towards the fastening portions, which provides for a weight reduction and a cost reduction since, without disadvantage, the cover can have a thinner sheet thickness and a lower strength than the outer profile.
  • the strength of the cover calculated as a combination of yield strength of the material and the sheet thickness may be less than half the corresponding strength of the outer profile.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Dampers (AREA)
  • Body Structure For Vehicles (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Optical Head (AREA)

Abstract

A bumper beam has a bow-formed outer profile (14), that has a central flange (16) and two webs (15, 18) and is fastened in two crash boxes (12, 13) with its central flange facing away from the crash boxes. The outer profile has a cover (15) so that the bumper beam will have a closed profile. The cover (15) has a central flange (24) and two webs (25, 26). The webs (17, 18) of the outer profile (14) are jointed in pairs with the webs (25, 26) of the cover (15), and the web height of the cover at its centre is bigger than the web height of the outer profile (14) at its centre.

Description

A bumper beam for a vehicle
Technical area
This invention relates to a bumper beam for a vehicle, comprising an outer profile with a bow-formed central flange and two webs and a cover that provides a closed profile, the outer profile being adapted to be fastened with its central flange facing outwards from the vehicle.
Background of the invention
A bumper beam that has good properties for various kinds of barrier crashes may be bad for a collision with a pole at a low velocity. One of the most common accidents involving a rear bumper beam, for example, is the crash against a lamp post on a parking lot. In particular when the bumper beam is fastened in crash boxes that are weak sideways, the bumper beam will collapse locally and fold.
Object of invention
It is an object of the invention to provide a bumper beam that has good performance generally and also good performance in a low velocity crash against a pole. This is achieved when the cover has a central flange and two webs, and the webs of the cover are coupled in pairs with the webs of the outer profile, the web height of the cover at its centre being greater than the web height of the outer profile at its centre.
Brief description of the drawings
Figure 1 is a top view of a bumper beam.
Figure 2 is a side view of the same bumper beam as seen from inside the vehicle.
Figure 3 is a section taken along line 3-3 in figure 1.
Figure 4 is an enlargement of a portion of figure 1.
Figure 5 is a perspective view of one of the parts that make up the bumper beam of the preceding figures.
Description of the illustrated and preferred example of the invention. Figure 1 shows, as seen from above, a bumper beam 11 of steel symmetrically fastened in two crash boxes 13, only one of which being illustrated and only schematically. The bumper beam is made up of an outer profile in the form of a bow-formed beam 14 and a cover 15. The outer profile is a hat profile as shown in figure 3 with a central flange 16 and two webs 17,18 that end in side flanges 19,20. The central portion of the central flange may have a longitudinal stiffener 21 , the depth of which decreases from its centre so that it ends at 22. The cover 15 is also in the form of a hat profile with a central flange 24 and two webs 25,26 that end in side flanges 27,28. The webs of the two hat beams are united by welds. The webs can be directly welded together or alternatively, they can be united by having their side flanges 19,20; 27,28 welded together as illustrated. As can be seen in figure 3, the sheet thickness of the cover is less than the sheet thickness of the outer profile. The steel of the cover may also have lower yield strength than the steel of the outer profile. The outer profile can suitably be press-hardened, that is, hot stamped and hardened in the same tools in one operation, whereas the cover can suitably be cold formed from cold-forming sheet steel. The outer profile may have a sheet thickness of 2 mm and a yield strength of about 1150 MPa or more, whereas the cover may have a considerably less sheet thickness and a yield strength of less than % of the yield strength of the outer profile, for example about half the strength. The sheet thickness of the cover may suitably be at most 3Λ of the thickness of the outer profile.
The cover 15, that is, the inner profile, is shown in perspective as figure 5. Its webs 25,26 has transverse stiffeners 23 and the height of the webs reduces continuously so that the cover ends a flat sheet.
As best shown in figure 4, the crash boxes 13 have a fastening plate 29 with holes for screws so that they can be screwed to a supporting portion of the vehicle. They have a fastening plate 30 as well in which the outer profile is fastened, preferably being welded thereto. The plate 30 has a portion 31 , which is bent outwards and under which the flat end of the cover extends and is welded to the portion 31 so that tension forces can be transmitted between the plate 30 and the cover. Alternatively, the cover may extend under the entire plate 30 and be welded both to the plate and to the outer profile. In both cases, the outer profile 14 is fastened in the crash boxes, either directly or indirectly with the cover inbetween. Since the cover may be made of comparatively thin sheet, its fastening to the crash boxes may be too weak in the absence of the plate 30 and such a plate 30 is therefore preferred.
The central flange 24 of the cover has linear extension between the crash boxes and the depth of the bumper beam at its middle is larger than its depth at its fastening portions. The depth relation should be at least 130% or rather at least 160%. The central flange 24 of the cover takes the tension load when the outer profile hits for example a post and it reduces the risk of local collapsing of the outer profile 14. Instead of collapsing, the bumper beam will have a dent. If the tension load would not be taken up, the outer profile 14 would tend to straighten out and bend the crash boxes outwards. At high a collision load, the crash boxes would bend outwards from each other and then, they could not deform as intended and could therefore not take up energy as intended. The central flange of the cover need not be exactly linear in order to take up tension load well. It should, however, be substantially linear, and a bow form with a pitch of a few cm has a minor effect on the capability of taking up tension load.
The depth of the outer profile increases continuously from the centre of the bumper beam towards the fastening portions, which provides for a weight reduction and a cost reduction since, without disadvantage, the cover can have a thinner sheet thickness and a lower strength than the outer profile. The strength of the cover calculated as a combination of yield strength of the material and the sheet thickness may be less than half the corresponding strength of the outer profile. The stiffeners 23 or corrugation of the webs

Claims

Claims 1. A bumper beam for a vehicle, comprising an outer profile (14) with a bow-formed central flange (16) and two webs (17,18), and a cover (15) that provides a closed profile, the outer profile being adapted to be fastened with its central flange facing outwards from the vehicle, characterised in that the cover (15) has a central flange (24) and two webs (25,26), and the two webs (25,26) of the cover are coupled in pairs with the two webs (17,18) of the outer profile (14), the web height of the cover (15) at its centre being greater than the web height of the outer profile (14) at its centre. 2. A bumper beam according to claim 1 ; characterised in that the web height of the outer profile (15) increases continuously sideways from its centre and the web height of the cover (15) decreases continuously sideways from it centre. 3. A bumper beam according to claim 1 or 2, characterised in that the depth of the bumper beam at its centre is at least 130% of the depth of the bumper beam at its fastening portions, and the central flange (24) of the cover extends substantially linearly between these fastening portions. 4. A bumper beam according to claim 3; characterised in that its depth at its centre is at least 160% of its depth at its fastening portions. 5. A bumper beam according to any one of the preceding claims, characterised in that the webs of the cover have transverse stiffeners (23). 6. A bumper beam according to any one of the preceding claims, characterised in that the outer profile (14) and the cover (15) are welded together. 7. A bumper beam according to claim 6, characterised in that both the outer profile (14) and the cover (15) have side flanges that end their webs, and these side flanges (19 and 27; 20 and 28) are welded together. 8. A bumper beam according to any one of the preceding claims, characterised in that the sheet of the cover has a lower yield strength than the sheet of the outer profile. 9. A bumper beam according to any one of the preceding claims characterised in that the sheet thickness of the cover (15) is less than the sheet thickness of the outer profile (14). 10. A bumper beam according to any one of the preceding claims, characterised in that the sheet of the cover has a lower yield strength than the sheet of the outer profile. 11.A bumper beam according to any one of the preceding claims characterised in that the sheet thickness of the cover (15) is less than the sheet thickness of the outer profile (14).
PCT/SE2005/000211 2004-02-25 2005-02-17 A bumper beam for a vehicle WO2005080141A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2007500710A JP2007523797A (en) 2004-02-25 2005-02-17 Automotive bumper beam
DE602005004514T DE602005004514T2 (en) 2004-02-25 2005-02-17 BUMPER ROD FOR ONE VEHICLE
US10/589,925 US7611175B2 (en) 2004-02-25 2005-02-17 Bumper beam for a vehicle
EP05711071A EP1723008B1 (en) 2004-02-25 2005-02-17 A bumper beam for a vehicle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0400435-4 2004-02-25
SE0400435A SE526613C2 (en) 2004-02-25 2004-02-25 Bumper for vehicles

Publications (1)

Publication Number Publication Date
WO2005080141A1 true WO2005080141A1 (en) 2005-09-01

Family

ID=31989602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/000211 WO2005080141A1 (en) 2004-02-25 2005-02-17 A bumper beam for a vehicle

Country Status (9)

Country Link
US (1) US7611175B2 (en)
EP (1) EP1723008B1 (en)
JP (1) JP2007523797A (en)
KR (1) KR20070005644A (en)
AT (1) ATE384643T1 (en)
DE (1) DE602005004514T2 (en)
ES (1) ES2300991T3 (en)
SE (1) SE526613C2 (en)
WO (1) WO2005080141A1 (en)

Cited By (9)

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Publication number Priority date Publication date Assignee Title
WO2006126941A1 (en) * 2005-05-25 2006-11-30 Gestamp Hardtech Ab A bumper beam
EP1773627A1 (en) * 2004-07-01 2007-04-18 Magna International Inc. Bumper beam for a motor vehicle
WO2008020793A1 (en) * 2006-08-15 2008-02-21 Gestamp Hardtech Ab A bumper beam
JP2008221920A (en) * 2007-03-09 2008-09-25 Marujun Co Ltd Bumper beam for automobile
EP2082924A1 (en) * 2008-01-22 2009-07-29 Peguform Gmbh Bumper for motor vehicles
EP2200871A1 (en) * 2006-10-10 2010-06-30 Gestamp HardTech AB A bumper beam
CN103661607A (en) * 2012-09-03 2014-03-26 现代自动车株式会社 Impact absorbing device for vehicle
EP2024201B2 (en) † 2006-05-18 2015-12-16 Gestamp HardTech AB Bumper beam
WO2018172647A1 (en) * 2017-03-24 2018-09-27 Psa Automobiles Sa Specific configuration of a vehicle impact absorption system

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JP4471904B2 (en) * 2005-08-01 2010-06-02 豊田鉄工株式会社 Bumper beam for automobile
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US9211858B2 (en) * 2013-10-11 2015-12-15 Shape Corp. Beam with varied bending moment, apparatus, and method
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US11283395B2 (en) 2018-03-23 2022-03-22 Nextracker Inc. Multiple actuator system for solar tracker
US11387771B2 (en) 2018-06-07 2022-07-12 Nextracker Llc Helical actuator system for solar tracker
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EP1773627A4 (en) * 2004-07-01 2009-11-11 Magna Int Inc Bumper beam for a motor vehicle
EP1773627A1 (en) * 2004-07-01 2007-04-18 Magna International Inc. Bumper beam for a motor vehicle
US7665777B2 (en) 2004-07-01 2010-02-23 Magna International Inc. Bumper beam for a motor vehicle
EP1888376A1 (en) * 2005-05-25 2008-02-20 Gestamp HardTech AB A bumper beam
US7794006B2 (en) 2005-05-25 2010-09-14 Gestamp Hardtech Ab Bumper beam
EP1888376A4 (en) * 2005-05-25 2010-03-03 Gestamp Hardtech Ab A bumper beam
WO2006126941A1 (en) * 2005-05-25 2006-11-30 Gestamp Hardtech Ab A bumper beam
EP2024201B2 (en) † 2006-05-18 2015-12-16 Gestamp HardTech AB Bumper beam
WO2008020793A1 (en) * 2006-08-15 2008-02-21 Gestamp Hardtech Ab A bumper beam
EP2200871A4 (en) * 2006-10-10 2011-04-27 Gestamp Hardtech Ab A bumper beam
EP2200871A1 (en) * 2006-10-10 2010-06-30 Gestamp HardTech AB A bumper beam
JP2008221920A (en) * 2007-03-09 2008-09-25 Marujun Co Ltd Bumper beam for automobile
JP4546496B2 (en) * 2007-03-09 2010-09-15 株式会社丸順 Bumper beam for automobile
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EP2082924A1 (en) * 2008-01-22 2009-07-29 Peguform Gmbh Bumper for motor vehicles
WO2009092406A1 (en) * 2008-01-22 2009-07-30 Peguform Gmbh Transversal bumper support for motor vehicles
CN103661607A (en) * 2012-09-03 2014-03-26 现代自动车株式会社 Impact absorbing device for vehicle
US8801059B2 (en) * 2012-09-03 2014-08-12 Hyundai Motor Company Impact absorbing device for vehicle
CN103661607B (en) * 2012-09-03 2017-04-12 现代自动车株式会社 Impact absorbing device for vehicle
WO2018172647A1 (en) * 2017-03-24 2018-09-27 Psa Automobiles Sa Specific configuration of a vehicle impact absorption system
FR3064229A1 (en) * 2017-03-24 2018-09-28 Peugeot Citroen Automobiles Sa SPECIFIC CONFIGURATION OF A VEHICLE SHOCK ABSORPTION SYSTEM
CN110461656A (en) * 2017-03-24 2019-11-15 标致雪铁龙汽车股份有限公司 The specific configuration of vehicle collision absorption system

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ES2300991T3 (en) 2008-06-16
ATE384643T1 (en) 2008-02-15
US20070176438A1 (en) 2007-08-02
SE526613C2 (en) 2005-10-18
US7611175B2 (en) 2009-11-03
SE0400435L (en) 2005-08-26
DE602005004514D1 (en) 2008-03-13
KR20070005644A (en) 2007-01-10
JP2007523797A (en) 2007-08-23
EP1723008B1 (en) 2008-01-23
DE602005004514T2 (en) 2009-01-29
SE0400435D0 (en) 2004-02-25
EP1723008A1 (en) 2006-11-22

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