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WO2009064236A1 - A b-pillar for a vehicle - Google Patents

A b-pillar for a vehicle Download PDF

Info

Publication number
WO2009064236A1
WO2009064236A1 PCT/SE2008/000638 SE2008000638W WO2009064236A1 WO 2009064236 A1 WO2009064236 A1 WO 2009064236A1 SE 2008000638 W SE2008000638 W SE 2008000638W WO 2009064236 A1 WO2009064236 A1 WO 2009064236A1
Authority
WO
WIPO (PCT)
Prior art keywords
pillar
mpa
tensile strength
height
less
Prior art date
Application number
PCT/SE2008/000638
Other languages
French (fr)
Inventor
Hans Bodin
Daniel Berglund
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40568151&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2009064236(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Gestamp Hardtech Ab filed Critical Gestamp Hardtech Ab
Priority to JP2010533990A priority Critical patent/JP5380458B2/en
Priority to EP08849349.9A priority patent/EP2209696B1/en
Priority to CN2008801162580A priority patent/CN101861265B/en
Priority to PL08849349T priority patent/PL2209696T3/en
Priority to RU2010119651/11A priority patent/RU2478511C2/en
Priority to KR1020107013079A priority patent/KR101535052B1/en
Priority to US12/734,525 priority patent/US8292354B2/en
Priority to ES08849349.9T priority patent/ES2456330T3/en
Publication of WO2009064236A1 publication Critical patent/WO2009064236A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/04—Door pillars ; windshield pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/02—Side panels
    • B62D25/025—Side sills thereof

Definitions

  • the invention relates to a B-pillar for a vehicle with an upper fastening portion for fastening to a roof member and a lower fastening portion for fastening to a sill member, the main portion of the B-pillar of predominantly martensitic structure having an ultimate strength of at least 1300 MPa and a less strong lower portion of the pillar having an tensile strength of not more than 800 MPa and only a small proportion of martensite.
  • the pillar to the rear of the forward door of a vehicle is called a B-pillar.
  • the pillar is substantially intended to provide protection in lateral collisions, and controlled deformation of it in a lateral collision is desired for best possible passenger protection.
  • EP-I 180 470 Al refers to a B-pillar which has a soft lower portion and promotes a controlled mode of deformation.
  • US 6,820,924 refers to a B-pillar which has two very narrow soft band as deformation triggers at a distance from the lower fastening portion of the pillar.
  • the object of the invention is to further improve a B-pillar, and in accordance with the invention the less strong portion has a height of at least 30 mm, extends less than 1/3 of total height of the pillar, and is so positioned that the lower fastening portion is predominantly martensitic.
  • the invention is defined by the claims.
  • Figure 1 depicts a B-pillar in perspective as an example of the invention.
  • Figure 2 depicts the same B-pillar in side view.
  • Figure 3 is a cross-section through the pillar, showing sheetmetal which covers it on the inside and the outside.
  • Figure 4 depicts schematically the deformation of the B-pillar in a lateral collision.
  • the B-pillar 11 depicted in the drawings is shaped from a planar steel blank and is of substantially hat-beam shape with varying cross-section along its length.
  • the top of the pillar has a transverse profile constituting a fastening portion 12 adapted to being welded to the vehicle's longitudinal roof member 13.
  • the bottom of the pillar has a transverse profile constituting a fastening portion adapted to being welded to the vehicle's sill member 15.
  • the roof member 13 and the sill member 15 are not depicted in Figure 1.
  • the pillar 11 has various necessary holes, e.g. fastening holes 16 for fastening the hinge of the rear door, fastening holes 17 for fastening the striker plate for the lock of the rear door, and a hole 18 for cable leadthrough.
  • the major length of the pillar is hardened into predominantly martensitic structure and the steel has a tensile strength of at least 1300 MPa 5 preferably at least 1400 MPa, but the pillar has a softer transverse band 20 with an tensile strength of less than 800 MPa.
  • This band has a different structure, e.g. a mixture of perlite, ferrite, bainite and annealed martensite.
  • the band has a height h of at least 30 mm and extends less than 1/3, or preferably less than 1 A, of the total height of the pillar. On both sides of the band there are transition zones to the unannealed martensite structure.
  • the soft band 20 should not reach to the lowest portion of the pillar, since at least the fastening portion 14 to the sill should be predominantly martensitic and of high strength.
  • Figure 4 depicts schematically the deformation of the pillar when subjected to a collision load represented by an arrow in the diagram.
  • the relatively narrow band 20 may have a height of less than 400 mm or less than 200 mm and is situated in the lower half, or preferably the lowest third, of the pillar, and the low positioning of the band promotes the desired deformation behaviour protecting the passenger's hip area without weakening the fastening of the pillar to the sill member.
  • the original state of the pillar is represented by a broken line.
  • the pillar 11 is with advantage made by the press-hardening method, i.e. it is hot-formed in a cooled pair of tools and maintained in the tools with the tools serving as a fixture until the pillar has hardened.
  • the press-hardening method There are various different ways of preventing rapid cooling, and hence preventing hardening, of the band 20. Some ways of preventing rapid cooling of specific portions of the product in the press-hardening method, such as the use of recesses or inserts in the pair of tools or heating of specific parts of the pair of tools, is described in GB 2313848 and US 3,703,093.
  • a blank of flat sheet steel is heated in a furnace to austenitic state and moved into a cooled pair of shaping tools and stamped into shape.
  • the shaped pillar is then maintained in the tools until it has hardened into an essentially martensitic structure with a tensile strength of at least 1300 MPa.
  • a portion of each tool adjacent the portion 20 of the pillar is heated and kept at such a temperature that the portion 20 is prevented from rapid cooling and will only reach a tensile strength of less than 800 MPa.
  • the press-hardening method does not result in the surface finish and tolerances desired for painted sheetmetal surfaces.
  • the painted side 21 of the bodywork is therefore usually form- pressed in such a way that it conceals the pillar 11, as illustrated in Figure 3.
  • the vehicle side 21 is spot- welded or bonded to side flanges 22, 23 of the pillar 11.
  • Thin sheetmetal 24 is also usually fastened on the inside and is thereafter covered with upholstery, but the pillar 11 constitutes the structural B-pillar.
  • the pillar 11 will therefore not be visible and what is visible will be the sheetmetal 21 on the outside and the upholstery on the inside.
  • This unit is then referred to as the B-pillar although it is only the portion 11 which is the structural pillar, although the sheet 24 contributes somewhat to the strength by preventing the hat profile from flatten out..

Landscapes

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

Abstract

A B-pillar (12) for a vehicle is fastened between a roof member (13) and a sill member (15) of the vehicle. The pillar has a martensitic structure and the steel has an tensile strength of at least 1300 MPa. Close to the lower fastening portion (14) there is a soft portion (20) with a tensile strength of less than 800 MPa. This soft portion has a height of at least 30 mm, extend over less than 1/3 of the pillar height, and is so positioned that the lower fastening portion is martensitic.

Description

B-pillar for a vehicle and a method of making such
Technical field
The invention relates to a B-pillar for a vehicle with an upper fastening portion for fastening to a roof member and a lower fastening portion for fastening to a sill member, the main portion of the B-pillar of predominantly martensitic structure having an ultimate strength of at least 1300 MPa and a less strong lower portion of the pillar having an tensile strength of not more than 800 MPa and only a small proportion of martensite.
Background to and purpose and object of the invention
The pillar to the rear of the forward door of a vehicle is called a B-pillar. The pillar is substantially intended to provide protection in lateral collisions, and controlled deformation of it in a lateral collision is desired for best possible passenger protection. EP-I 180 470 Al refers to a B-pillar which has a soft lower portion and promotes a controlled mode of deformation. US 6,820,924 refers to a B-pillar which has two very narrow soft band as deformation triggers at a distance from the lower fastening portion of the pillar.
The object of the invention is to further improve a B-pillar, and in accordance with the invention the less strong portion has a height of at least 30 mm, extends less than 1/3 of total height of the pillar, and is so positioned that the lower fastening portion is predominantly martensitic. The invention is defined by the claims.
Brief description of the drawings
Figure 1 depicts a B-pillar in perspective as an example of the invention.
Figure 2 depicts the same B-pillar in side view.
Figure 3 is a cross-section through the pillar, showing sheetmetal which covers it on the inside and the outside.
Figure 4 depicts schematically the deformation of the B-pillar in a lateral collision.
Description of depicted and preferred embodiment example of the invention
The B-pillar 11 depicted in the drawings is shaped from a planar steel blank and is of substantially hat-beam shape with varying cross-section along its length. The top of the pillar has a transverse profile constituting a fastening portion 12 adapted to being welded to the vehicle's longitudinal roof member 13. The bottom of the pillar has a transverse profile constituting a fastening portion adapted to being welded to the vehicle's sill member 15. The roof member 13 and the sill member 15 are not depicted in Figure 1.
The pillar 11 has various necessary holes, e.g. fastening holes 16 for fastening the hinge of the rear door, fastening holes 17 for fastening the striker plate for the lock of the rear door, and a hole 18 for cable leadthrough.
The major length of the pillar is hardened into predominantly martensitic structure and the steel has a tensile strength of at least 1300 MPa5 preferably at least 1400 MPa, but the pillar has a softer transverse band 20 with an tensile strength of less than 800 MPa. This band has a different structure, e.g. a mixture of perlite, ferrite, bainite and annealed martensite. The band has a height h of at least 30 mm and extends less than 1/3, or preferably less than 1A, of the total height of the pillar. On both sides of the band there are transition zones to the unannealed martensite structure. The soft band 20 should not reach to the lowest portion of the pillar, since at least the fastening portion 14 to the sill should be predominantly martensitic and of high strength.
Figure 4 depicts schematically the deformation of the pillar when subjected to a collision load represented by an arrow in the diagram. The relatively narrow band 20 may have a height of less than 400 mm or less than 200 mm and is situated in the lower half, or preferably the lowest third, of the pillar, and the low positioning of the band promotes the desired deformation behaviour protecting the passenger's hip area without weakening the fastening of the pillar to the sill member. The original state of the pillar is represented by a broken line.
The pillar 11 is with advantage made by the press-hardening method, i.e. it is hot-formed in a cooled pair of tools and maintained in the tools with the tools serving as a fixture until the pillar has hardened. There are various different ways of preventing rapid cooling, and hence preventing hardening, of the band 20. Some ways of preventing rapid cooling of specific portions of the product in the press-hardening method, such as the use of recesses or inserts in the pair of tools or heating of specific parts of the pair of tools, is described in GB 2313848 and US 3,703,093. In a preferred method, a blank of flat sheet steel is heated in a furnace to austenitic state and moved into a cooled pair of shaping tools and stamped into shape. The shaped pillar is then maintained in the tools until it has hardened into an essentially martensitic structure with a tensile strength of at least 1300 MPa. A portion of each tool adjacent the portion 20 of the pillar is heated and kept at such a temperature that the portion 20 is prevented from rapid cooling and will only reach a tensile strength of less than 800 MPa.
The press-hardening method does not result in the surface finish and tolerances desired for painted sheetmetal surfaces. The painted side 21 of the bodywork is therefore usually form- pressed in such a way that it conceals the pillar 11, as illustrated in Figure 3. The vehicle side 21 is spot- welded or bonded to side flanges 22, 23 of the pillar 11. Thin sheetmetal 24 is also usually fastened on the inside and is thereafter covered with upholstery, but the pillar 11 constitutes the structural B-pillar. On a completed vehicle, the pillar 11 will therefore not be visible and what is visible will be the sheetmetal 21 on the outside and the upholstery on the inside. This unit is then referred to as the B-pillar although it is only the portion 11 which is the structural pillar, although the sheet 24 contributes somewhat to the strength by preventing the hat profile from flatten out..

Claims

Claims
1. A B-pillar for a vehicle, comprising an upper fastening portion (12) for fastening to a roof member (13), and a lower fastening portion (14) for fastening to a sill member (15), the main portion of the B-pillar being of predominantly martensitic structure with a tensile strength of at least 1300 MPa and a less strong lower portion (20) of the pillar having a tensile strength of not more than 800 MPa, characterised in that the less strong portion (20) has a height of more than 30 mm, extends less than 1/3 of total height of the pillar, and is so positioned that the lower fastening portion (14) is predominantly martensitic.
2. A B-pillar according to claim I5 characterised in that the less strong portion (14) has a height of less than 1A of the total height of the pillar.
3. A B-pillar according to claim 1, characterised in that the less strong portion has a height of between 50 and 200 mm.
4. A B-pillar according to any one of the above claims, characterised in that the B-pillar has an tensile strength of at least 1400 MPa.
5. A method of shaping a B-pillar for a vehicle by hot-shaping an austenitic blank of sheet steel in a cooled pair of tools and keeping the shaped pillar in the cooled pair of tools until it has hardened into an essentially martensitic structure with a tensile strength of at least 1300 MPa, characterised in that a portion (20) with a height of 30-400 mm is prevented from rapid cooling such that it will reach a tensile strength of less than 800 MPa and said portion is positioned at the lower half of the pillar above a bottom portion (14), which will have a tensile strength of at least 1300 MPa.
PCT/SE2008/000638 2007-11-15 2008-11-12 A b-pillar for a vehicle WO2009064236A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP2010533990A JP5380458B2 (en) 2007-11-15 2008-11-12 B-pillar for vehicle and method for manufacturing B-pillar
EP08849349.9A EP2209696B1 (en) 2007-11-15 2008-11-12 A b-pillar for a vehicle
CN2008801162580A CN101861265B (en) 2007-11-15 2008-11-12 A B-pillar for a vehicle
PL08849349T PL2209696T3 (en) 2007-11-15 2008-11-12 A b-pillar for a vehicle
RU2010119651/11A RU2478511C2 (en) 2007-11-15 2008-11-12 Vehicle body medium strut and method of its fabrication
KR1020107013079A KR101535052B1 (en) 2007-11-15 2008-11-12 A b－pillar for a vehicle
US12/734,525 US8292354B2 (en) 2007-11-15 2008-11-12 B-pillar for a vehicle
ES08849349.9T ES2456330T3 (en) 2007-11-15 2008-11-12 Pillar B for vehicle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0702513A SE0702513L (en) 2007-11-15 2007-11-15 B-pillar for vehicles
SE0702513-3 2007-11-15

Publications (1)

Publication Number Publication Date
WO2009064236A1 true WO2009064236A1 (en) 2009-05-22

Family

ID=40568151

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/000638 WO2009064236A1 (en) 2007-11-15 2008-11-12 A b-pillar for a vehicle

Country Status (10)

Country Link
US (1) US8292354B2 (en)
EP (1) EP2209696B1 (en)
JP (1) JP5380458B2 (en)
KR (1) KR101535052B1 (en)
CN (1) CN101861265B (en)
ES (1) ES2456330T3 (en)
PL (1) PL2209696T3 (en)
RU (1) RU2478511C2 (en)
SE (1) SE0702513L (en)
WO (1) WO2009064236A1 (en)

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SE531499C2 (en) 2009-04-28
JP2011502881A (en) 2011-01-27
EP2209696B1 (en) 2014-01-08
CN101861265B (en) 2013-11-20
RU2010119651A (en) 2011-11-27
CN101861265A (en) 2010-10-13
ES2456330T3 (en) 2014-04-22
JP5380458B2 (en) 2014-01-08
SE0702513L (en) 2009-04-28
US8292354B2 (en) 2012-10-23
EP2209696A1 (en) 2010-07-28
PL2209696T3 (en) 2014-07-31
KR101535052B1 (en) 2015-07-08
US20100308623A1 (en) 2010-12-09
RU2478511C2 (en) 2013-04-10
EP2209696A4 (en) 2011-05-25
KR20100095595A (en) 2010-08-31

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