• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    lO lO Abstract The invention relates to a bumper (B), comprising a cross beam(l) mounted to at least two crash boxes (2) which are attachedto a vehicle. The cross beam (l) has a primary contact face inthe form of bent longitudinal upper and lower flanges (3, 4).The bent longitudinal upper and lower flanges (3, 4) have eacha portion (5) with a large inner radius (R) at least at themounting site of the cross beam (l) to respective crash box (2) compared to a small inner radius (r) of the rest of each of the bent longitudinal upper and lower flanges (3, 4).
    公开号:SE1551680A1
    申请号:SE1551680
    申请日:2015-12-21
    公开日:2017-06-22
    发明作者:Hultkvist Jakob
    申请人:Gestamp Hardtech Ab；
    IPC主号:
    专利说明:

    BUMPER Field of the invention The invention relates to a bumper according to the preamble ofclaim 1, and more particular to a bumper having a cross beamwith bent longitudinal upper and lower flanges having each at least a portion with partially variable radius.
    Background of the invention One of the crash test performed to a bumper is the RCARAllianz Crash Repair test, commonly known as the AZT crashtest. In said test the AZT barrier has a mass of 1400 kg, itimpacts the bumper of the vehicle with a velocity of 16 km/hand at an impact angle of 10° which often results in anundesired high peak load at the beginning of the load curve when measuring force over time.
    An optimal behavior of the bumper in the test would be aconstant high load over time, i.e. the cross beam of thebumper should deform and “cushion” the initial peak load before the crash box/boxes of the bumper starts to buckle.
    Object of the invention An object of the invention is to achieve a bumper having across beam which reduces or eliminates the undesired high peakload at the beginning of the load curve during the AZT crash test or any other offset crash test.
    A further object is to achieve a bumper having a cross beamwith a reduce weight, but yet having as high constant load aspossible over time during the AZT crash test or any other offset crash test. lO Brief description of the invention According to the invention these objects are achieved by abumper, comprising a cross beam mounted to at least two crashboxes which are attached to a vehicle, said cross beam havinga primary contact face in the form of bent longitudinal upperand lower flanges, characterized in that said bentlongitudinal upper and lower flanges have each a portion witha large inner radius at least at the mounting site of thecross beam to respective crash box compared to a small innerradius of the rest of each of the bent longitudinal upper and lower flanges.
    Preferred embodiments are defined in the dependent claims.
    Brief description of the drawings The invention is described in more detail below with referencebeing made to non-limiting examples shown on the appendeddrawings, in which - Fig. l is front view of a bumper with a cross beam havingvariable radius of at least a part of bent longitudinal upperand lower flanges according to the invention, - Fig. 2 is view of a portion of the cross beam shown in Fig.2 from behind with mounted crash box, - Fig. 3a is a view obliquely from above and behind of aportion of the cross beam with mounted crash box at which theradius of the bent longitudinal upper and lower flangesdecreases towards the respectively end of the cross member, - Fig. 3b is a view similar to the one shown in Fig. 3a but inwhich the radius of the bent longitudinal upper and lowerflanges is maintained unchanged towards the respectively endof the cross member, - Fig. 4 is a cross sectional view of the crash box with lO mounted cross beam taken at section L-L in Fig. 3b, - Fig. 5 is a cross sectional view of the crash box withmounted cross beam shown in Fig. 4 having a cover member, and- Fig. 6 a diagram showing the load curve when measuring forceover time for three cross beams with bent longitudinal upperand lower flanges having different radiuses at an area in the vicinity of a crash box.
    Description of preferred embodiments As seen in Figs. l to 5 the bumper B comprises a cross beam land at least two crash boxes 2 mounted on the back side/U-shaped side of the cross beam. The crash boxes are attached toa vehicle (not shown). The cross beam l has a primary contactface in the form of bent longitudinal upper 3 and lowerflanges 4 for primary contact with the AZT barrier during the AZT crash test.
    According to the invention, for enabling the cross beam of thebumper to deform and “cushion” the initial peak load duringthe AZT crash test or any other offset crash test, before thecrash box(es) of the bumper starts to buckle, the bentlongitudinal upper and lower flanges 3, 4 have each a portion5 (see Fig. 3a and 3b, for instance) with a larger innerradius R at least at the mounting site of the cross beam l torespective crash box 2 than the inner radius of the rest of the bent longitudinal upper and lower flanges 3, 4.
    Preferably, the cross beam l is hat-shaped as seen in crosssection (see Figs. 4 and 5) and may be provided with a coverplate lO (Fig. 5). The purpose of the cover plate lO is tokeep the bent longitudinal upper 3 and lower flanges 4 fromseparating during the AZT crash test and is arranged on the front side of the cross beam l. The cover plate lO also contributes to the stiffness of the cross beam 1 whichincrease performance in certain crash tests, such as RCAR “bumper to bumper” crash test.
    As seen in Figs. 1 to 5, the cross beam 1 is preferablyattached to respective crash box 2 in such a way that a centreweb section 9 of the cross beam 1 is directed towards and protrudes into said respective crash box.
    Thus, according to the invention at least a portion of bentlongitudinal upper 3 and lower flanges 4 of the cross beamshould have variable radius. More particularly, the largeinner radius R of said portion 5 of each of the bentlongitudinal upper and lower flanges 3, 4 at or in thevicinity of the mounting site to respective crash box 2 shouldbe within the interval of 10 to 16 mm, preferably 11 to 14 mm,and most preferably 12 to 13 mm. The small inner radius r ofthe rest, i.e. the parts of each of the bent longitudinalupper and lower flanges 3, 4 on both sides of the portion 5,should be in an embodiment within the interval of 5 to 9 mm, preferably 6 to 8 mm, see Fig. 3a.
    As seen in Fig. 3a the large inner radius R is progressivelytransformed via a transformation zone 14 into the small innerradius r at a suitable distance from the centre line L ofrespective crash box towards respective end 6. Said transformation zone may have a length of 15 to 200 mm.
    In another embodiment the large inner radius R of said portion5 of the bent longitudinal upper and lower flanges 3, 4 at orin the vicinity of the mounting site to respective crash box 2should be within the interval as stated above, and this large inner radius R of each of the bent longitudinal upper and lower flanges 3, 4 should be the same and continue to respective end 6 of the cross beam 1. See Fig. 3b.
    More precisely, in one embodiment said portion 5 with largeinner radius R of each of the bent longitudinal upper andlower flanges 3, 4 should extend on one hand a distance of 25to 300 mm, preferably 50 to 250, and most preferably 75 to 150mm, from the centre line L of respective crash box 2 along andtowards the centre of the cross beam 1 and on the other handfrom said centre line L to respective end 6 of the cross beam 1.
    In another embodiment said portion 5 with large inner radius Rof each of the bent longitudinal upper and lower flanges 3, 4should extend a distance of 25 to 300 mm, preferably 50 to250, and most preferably 75 to 150 mm, on either side fromsaid centre line L of respective crash box 2 along the cross beam 1.
    Said distance can be the same or different on either side of the centre line L of the respective crash box.
    As can be seen in Figs. 3a and 3b, the bent longitudinal upperand lower flanges 3, 4 are preferably so bent that the lug ofrespective upper and lower flanges is directed towards thevehicle, i.e. extends in a horizontal direction. Thus, thebent longitudinal upper and lower flanges 3, 4 are U-shaped atleast at the central portion of the cross beam 1. At theportion 5 which extends at least from respective crash box 2to respective end 6 of the cross beam 1, the lug of respectiveupper and lower flanges extends preferably in a vertical direction.
    Thus, according to the invention by forming at least a portion of the respective longitudinal upper and lower flanges 3, 4 at respective crash box 2 with increased radius, it is possibleto reduce the radius of said respective longitudinal upper andlower flanges 3, 4, at least in a middle portion of the crossmember. By so doing, it is possible to reduce the sectionheight and/or the thickness of material of the cross beam 1,and thus reduce the total weight of the cross beam 1 and yetmaintain the desired stiffness of the cross beam 1 havingreduced or eliminated high peak load at the beginning of theload curve during the AZT crash test or any other offset crash test.
    As can be inferred from Fig. 2 the cross beam 1 may beprovided with different hols 12 for temporary mounting of atow hook/toe eye, for instance. It may also have one or moreindentations 13 for different purposes (see Fig. 2). The crossbeam 1 may even be provided with differently bent sectionswhich does not have to be the same with respect to therespective bent longitudinal upper and lower flange 3, 4.
    Therefore, the profile of the cross beam 1, as seen in cross section at line C-C, for instance, may be unsymmetrical.
    Fig. 6 shows a diagram of the load curve when measuring forceover time for three cross beams, A with a radius of 10 mm, Bwith a radius of 12 mm, and C with a radius of 15 mm. As canbe inferred, with a cross beam 1 having bent longitudinalupper and lower flanges 3, 4 with particularly a radius of 15mm the undesired high peak load at the beginning of the loadcurve will be reduced without reducing the strength of the cross member 1.
    In an embodiment not shown the bent longitudinal upper and lower flanges of the cross beam may have different radii.
    The Variable radius can be applied to any open or closed crossbeam which features one or more swept radiuses along thelength of the front of the cross beam, in case where aninitial cushioning effect is desired in an AZT crash test orany other offset crash test while maintaining the torsionalrigidity and bending strength of across beam having a short radius.
    权利要求:
    Claims (10)
    [1] 1. A bumper (B), comprising a cross beam (1) mounted to atleast two crash boxes (2) which are attached to a vehicle,said cross beam (1) having a primary contact face in the formof bent longitudinal upper and lower flanges (3, 4),characterized in that said bent longitudinal upper and lowerflanges (3, 4) have each a portion (5) with a large innerradius (R) at least at the mounting site of the cross beam (1)to respective crash box (2) compared to a small inner radius(r) of the rest of each of the bent longitudinal upper andlower flanges (3, 4).
    [2] 2. The bumper (B) according to claim 1, characterized in thatthe large inner radius (R) of said portion (5) of each of thebent longitudinal upper and lower flanges (3, 4) at themounting site to respective crash box (2) is within theinterval of 10 to 16 mm, preferably 11 to 14 mm, and mostpreferably 12 to 13 mm, and that the small inner radius (r) ofthe rest of each of the bent longitudinal upper and lowerflanges (3, 4) is within the interval of 5 to 9 mm, preferably 6 to 8 mm.
    [3] 3. The bumper (B) according to claim 1 or 2, characterized inthat said portion (5) with large inner radius (R) of each ofthe bent longitudinal upper and lower flanges (3, 4) extendson one hand a distance of 25 to 300 mm, preferably 50 to 250,and most preferably 75 to 150 mm, from a centre line (L) ofrespective crash box (2) along and towards the centre of thecross beam (1) and on the other hand from said centre line (L) to respective end (6) of the cross beam (1).
    [4] 4. The bumper (B) according to claim 1 or 2, characterized inthat said portion (5) with large inner radius (R) of each of the bent longitudinal upper and lower flanges (3, 4) extends a distance of 25 to 300 mm, preferably 50 to 250, and mostpreferably 75 to 150 mm, on either side from a centre line (L) of respective crash box (2) along the cross beam (1).
    [5] 5. The bumper (B) according to claim 3 or 4, characterized inthat said distance can be the same of different on either side of the centre line L of the respective crash box.
    [6] 6. The bumper (B) according any one of the preceding claims, characterized in that the cross beam (1) is hat-shaped.
    [7] 7. The bumper (B) according to claim 6, characterized in thatthe hat-shaped cross beam (1) is provided with a cover plate (10).
    [8] 8. The bumper beam (B) according to any one of the precedingclaims, characterized in that the cross beam (1) has an unsymmetrical profile as seen in cross section.
    [9] 9. The bumper (B) according to any one of the precedingclaims, characterized in that each of the bent longitudinalupper and lower flanges (3, 4) of said portion (5) whichextends from respective crash box (2) to respective end (6) of the cross beam (1) extend in the vertical direction.
    [10] 10. The bumper (B) according to any one of the precedingclaims, characterized in that each of the bent longitudinalupper and lower flanges (3, 4) is U-shaped at least at the central portion of the cross beam (1).
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    同族专利:
    公开号 | 公开日
    JP6914272B2|2021-08-04|
    CN108473101B|2021-08-03|
    CA3005307A1|2017-06-29|
    CN108473101A|2018-08-31|
    EP3393862A4|2019-05-08|
    WO2017111682A1|2017-06-29|
    SE539435C2|2017-09-19|
    JP2019500280A|2019-01-10|
    KR20180095078A|2018-08-24|
    EP3393862A1|2018-10-31|
    US20180370470A1|2018-12-27|
    US10442379B2|2019-10-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    ES2294339T3|2003-12-08|2008-04-01|Gestamp Hardtech Aktiebolag|BUMPER BAR AND VEHICLE WITH SUCH BAR.|
    DE102004014047B4|2004-03-19|2006-01-05|Benteler Automobiltechnik Gmbh|Connection of a crash box to the cross member|
    SE0501174L|2005-05-25|2006-07-25|Gestamp Hardtech Ab|Bumper beam for vehicles|
    EP1736369B1|2005-06-24|2013-01-16|Benteler Automobiltechnik GmbH|Bumper for motor vehicle|
    AT480427T|2006-05-18|2010-09-15|Gestamp Hardtech Ab|BUMPER ROD FOR ONE VEHICLE|
    DE102006048429A1|2006-10-12|2008-04-17|Magna Automotive Services Gmbh|Energy absorption device, in particular for non-axial load|
    JP5261396B2|2006-11-09|2013-08-14|イェスタムプ・ハードテック・アクチエボラーグ|Bumper beam|
    WO2011123012A1|2010-03-29|2011-10-06|Gestamp Hardtech Ab|Bumper arrangement for vehicles|
    IT1401982B1|2010-09-28|2013-08-28|Tres Srl|POLYMERIC IMPACT ABSORPTION ELEMENT FOR A VEHICLE AND BUMPER STRUCTURE.|
    JP5281194B2|2011-03-24|2013-09-04|アイシン高丘株式会社|Collision reinforcement for vehicles|
    JP5987638B2|2012-10-31|2016-09-07|マツダ株式会社|Vehicle body structure|
    DE102013100720B4|2013-01-24|2014-11-27|Benteler Automobiltechnik Gmbh|Cross member for a motor vehicle|
    SE537087C2|2013-03-13|2014-12-30|Gestamp Hardtech Ab|Bumper beam|
    DE102013015421B4|2013-09-18|2020-11-05|Benteler Automobiltechnik Gmbh|Bumper system|
    US10000170B2|2014-03-05|2018-06-19|Gestamp Hardtech Ab|Bumper beam with embossed cover|
    US9527464B2|2014-11-25|2016-12-27|Toyota Motor Engineering & Manufacturing North America, Inc.|Bumpers including a reinforcement bracket and vehicles incorporating the same|US10464512B2|2015-07-31|2019-11-05|Sabic Global Technologies B.V.|Beam with torsional deformation and multi-geometry cross-section|
    SE541147C2|2015-12-08|2019-04-16|Gestamp Hardtech Ab|Bumper beam|
    DE102019108907B4|2019-04-04|2021-06-02|Benteler Automobiltechnik Gmbh|Bumper arrangement with clinched mount|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1551680A|SE539435C2|2015-12-21|2015-12-21|bumper|SE1551680A| SE539435C2|2015-12-21|2015-12-21|bumper|
    KR1020187021073A| KR20180095078A|2015-12-21|2016-12-09|bumper|
    US15/777,689| US10442379B2|2015-12-21|2016-12-09|Bumper|
    CA3005307A| CA3005307A1|2015-12-21|2016-12-09|Bumper|
    PCT/SE2016/051242| WO2017111682A1|2015-12-21|2016-12-09|Bumper|
    EP16879478.2A| EP3393862A4|2015-12-21|2016-12-09|Bumper|
    CN201680072937.7A| CN108473101B|2015-12-21|2016-12-09|Bumper|
    JP2018551744A| JP6914272B2|2015-12-21|2016-12-09|Bumper|
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