WO2024099714A1 - Structure de base pour un corps d'un véhicule automobile à entraînement électrique - Google Patents

Structure de base pour un corps d'un véhicule automobile à entraînement électrique Download PDF

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Publication number
WO2024099714A1
WO2024099714A1 PCT/EP2023/078924 EP2023078924W WO2024099714A1 WO 2024099714 A1 WO2024099714 A1 WO 2024099714A1 EP 2023078924 W EP2023078924 W EP 2023078924W WO 2024099714 A1 WO2024099714 A1 WO 2024099714A1
Authority
WO
WIPO (PCT)
Prior art keywords
cross member
floor structure
weakening
vehicle
profile
Prior art date
Application number
PCT/EP2023/078924
Other languages
German (de)
English (en)
Inventor
Marcus Raepple
Aline Lemke
Sebastian Zech
Jonas D'haen
Original Assignee
Bayerische Motoren Werke Aktiengesellschaft
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 Bayerische Motoren Werke Aktiengesellschaft filed Critical Bayerische Motoren Werke Aktiengesellschaft
Publication of WO2024099714A1 publication Critical patent/WO2024099714A1/fr

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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
    • B62D21/15—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
    • B62D21/157—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 for side impacts
    • 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
    • B62D25/20—Floors or bottom sub-units
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars

Definitions

  • the invention relates to a floor structure for a body of an electrically driven motor vehicle according to the preamble of patent claim 1.
  • Such floor structures are known from the prior art and usually comprise side sills running along the outer sides of the vehicle, which are connected to one another via a plurality of cross members, for example respective seat cross members.
  • the storage housings arranged below the floor structure are no longer reinforced by cross members running inside the storage housing, since these cross members require valuable installation space inside the storage housing for storage cells of the energy storage unit of the electrically driven motor vehicle.
  • the cross members that previously ran inside the storage housing are no longer provided, the cross members of the floor structure arranged above the vehicle floor must be made more stable and rigid in order to ensure sufficient rigidity in the event of a side collision of the motor vehicle, in particular in the event of a pole impact, so that the storage cells of the energy storage unit arranged inside the storage housing are not impacted.
  • the cross members should also be deformable within certain limits while absorbing impact energy in order to be able to sufficiently dissipate impact energy.
  • the object of the present invention is therefore to provide a floor structure of the type mentioned at the outset which has improved properties in the event of a side collision with the body of the motor vehicle.
  • the floor structure according to the invention comprises side sills running along the outside of the vehicle, which are connected to one another via a plurality of cross members.
  • the invention provides that at least one cross member has a weakening in the connection area to the side sills. According to the invention, it is therefore provided that the at least one cross member is extremely stable in a central region in order to protect the storage cells of the energy storage device arranged beneath this floor structure or to limit the deformation of the floor structure and the storage housing.
  • the strength or rigidity is to be reduced in a targeted manner by the targeted weakening of the cross member at the end in the respective connection area to the side sills in order to create a support by means of the cross member in the event of a side impact on the respective side sills assigned to the side, which can give way accordingly while absorbing impact energy.
  • the cross member which is extremely stiff and strong in the central region, is deliberately weakened on its outer sides in order to enable particularly good deformation while absorbing impact energy within certain limits, namely, for example, over the length of the connection area.
  • the present invention is used in particular in floor structures in which the storage housing arranged below the floor structure is no longer stiffened by respective cross members running within the storage housing, since these cross members require valuable installation space within the storage housing for storage cells of the energy storage system of the electrically driven motor vehicle.
  • the weakening is produced by at least one decreasing wall thickness of the profile of the at least one cross member and/or by at least one change in the material properties, in particular the strength, of the profile of the at least one cross member.
  • the weakening can also be formed by at least one recess within the profile of the cross member.
  • these measures can also superimposed.
  • the desired weakening is achieved on the outside of the cross member in the connection area to the respective side sills in order to achieve the effects described.
  • connection area has a plurality of adjoining areas of weakening. Consequently, it is possible, for example, to design the wall thickness of the profile of the respective cross member to increase from the outside to the inside or, for example, to design the strength to increase from the outside to the inside in the area of the connection area of the side sill. By appropriately designing the respective recess, it is also possible to achieve a desired deformation behavior of the respective cross member.
  • the aim is to ensure that the weakening of the individual areas decreases from the outside to the inside, so that the cross member is softer on the outside in the connection area and successively stronger towards the inside.
  • cross member is attached to the side sill via an adapter. This largely avoids undesirable relative movement of the outer end of the cross member relative to the corresponding side sill as a result of an accident-related force being applied.
  • the adapter is arranged in such a way that it covers at least the connection area of the side sill that has the weakenings. This makes it possible to achieve particularly effective guidance of the side sill in the event of deformation caused by an accident.
  • the adapter is manufactured as a folded part from a metal sheet. This makes it particularly easy to manufacture and allows the corresponding degrees of deformation to be achieved. Further features of the invention emerge from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and/or shown alone in the figures can be used not only in the combination specified in each case, but also in other combinations or on their own.
  • Fig. 1 is a partial and perspective sectional view along a sectional plane running in the transverse direction of the vehicle or in the vertical direction of the vehicle through the floor structure according to the invention, wherein a side sill extending on the outside of the vehicle can be seen in cross-sectional view, to which a cross member of the floor structure is connected above a vehicle floor, which has a weakening in the connection area to the side sill, and
  • Fig. 2 is a further partial and perspective sectional view of the
  • Fig. 1 shows a partial and perspective sectional view of a floor structure 1 for a body of an electrically driven motor vehicle along a sectional plane running in the vertical direction of the vehicle or in the transverse direction of the vehicle, a side sill 2 running along the outside of the vehicle, to which one of several cross members 3 is connected, which extends horizontally and in the transverse direction of the vehicle.
  • a side sill 2 of this type is also provided, to which the respective cross member 3 is connected with its opposite end.
  • it is a seat cross member which runs in the transverse direction of the vehicle and horizontally in the area of a front row of vehicle seats.
  • an invisible storage housing of an energy storage device for supplying the electric drive of the passenger car with electrical energy is provided beneath the floor structure 1, which extends, for example, between the two side sills 2 and beneath the respective cross members 3 of the floor structure 1.
  • a floor element for example a floor panel 4
  • the floor panel 4 can be formed either by the upper housing part of the storage housing of the energy storage device or by a separate sheet metal element or the like, with the upper housing part of the storage housing being arranged at a distance below this floor panel 4.
  • the respective cross members 3 must be designed to be correspondingly stiff and stable or have a high level of strength.
  • the cross members, such as the cross member 3 are made from a hollow profile, for example from a high-strength or ultra-high-strength steel.
  • the cross member 3, together with the floor plate 4, forms respective chamber profiles which contribute to the reinforcement of the floor structure.
  • the cross member 3 has one or, in the present case, several weakenings 5, 6, 7, 8 in the connection area A to the side sills 2.
  • These weakenings 5 to 8 are produced, for example, by different wall thicknesses of the profile of the cross member 3 and/or by at least one change in the material properties, in particular the strength, of the profile of the corresponding cross member 3.
  • the outermost weakening 5 can be formed by a smaller wall thickness or the like than the weakenings 6 to 8 arranged on the inside thereof.
  • These weakenings 6 to 8 can also be formed, for example, by successively increasing wall thicknesses of the profile of the cross member 3.
  • the cross member 3 preferably has at least one weakening 5 to 8 on the outside in the connection area A to the side sills 2.
  • the wall thickness can, for example, decrease from the inside to the outside via the weakenings 8 down to 5.
  • the weakening 5 to 8 can also be caused by a decreasing strength or by By making at least one recess in the region of one of these weakenings 5 to 8.
  • the cross member 3 has the lowest strength or rigidity near the connection point to the side sill 2 and becomes successively stiffer or stronger towards the middle of the vehicle as a result of a suitable number of weakenings 5 to 8 until the cross member 3 has its full stiffness and strength adjacent to the connection area A or in the middle area of the cross member 3.
  • Fig. 1 it can also be seen that the cross member 3 is supported on the outside on an inner sheet or an inner shell 9 of the side sill 2, which forms a chamber 11 with a sheet metal part 10 that is essentially U-shaped in cross section, within which an energy absorption element 12 is arranged, which is supported against the inner part 9 of the side sill 2 and thus, through the intermediary of the latter, on the cross member 3.
  • the cross member 3 ensures that the energy absorption element 12 is supported sufficiently stably and can be deformed while absorbing impact energy. If additional absorption of impact energy is also required, the cross member 3 can deform accordingly while absorbing impact energy due to its at least one weakening 5 to 8 in the connection area A to the side sill 2.
  • the middle area of the cross member 3 or the floor structure 1, however, is arranged outside the weakening 5 to 8 and is therefore designed to be so rigid that there is essentially no deformation of the floor structure 1 or the storage housing arranged underneath, which could lead to damage to the storage cells of the energy storage arranged inside the storage housing and which could ultimately trigger a thermal event.
  • the present invention is therefore based on the basic idea that accident energy should also be able to be absorbed by means of the respective cross members 3 in the connection area A to the side sills 2, without the cross members 3 being deformed in such a way that significant damage to the storage cells of the energy storage occurs.
  • Fig. 2 shows, analogously to Fig.
  • FIG. 1 a partial and perspective sectional view through the floor structure 1 along a sectional plane running in the vertical direction of the vehicle or in the transverse direction of the vehicle.
  • the cross member 3 is attached to the side sill 2 assigned to the side via an adapter.
  • the adapter 13 is placed on the top of the connection area A of the side sill 3 and preferably extends at least over the length of this connection area A. This means that the adapter 13 preferably extends over at least approximately the entire length of the weakened areas 5 to 8 of the cross member 3.
  • the adapter 13 is here produced, for example, as a folded part from a metal sheet and is connected to the inner part 9 of the side sill 2 by means of respective tabs 14 via corresponding joining connections, for example spot welds or the like.
  • respective screw connections 15 are provided, via which the adapter 13 is screwed to the energy absorption element 12 via the inner part 9 of the side sill 2.
  • the adapter can also be connected to the cross member 3 via respective joining connections or the like.
  • the adapter provides a particularly favorable mounting and support of the cross member 3 relative to the side sill 2, particularly after an accident-related force is applied as a result of a side impact, so that the cross member 3 cannot, for example, move upwards in the vertical direction of the vehicle or the like if an accident-related force is applied as a result of a side impact.

Landscapes

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

Abstract

L'invention concerne une structure de base (1) pour un corps d'un véhicule automobile à entraînement électrique, comprenant des longerons latéraux (2), s'étendant le long des côtés extérieurs du véhicule, qui sont reliés les uns aux autres par une pluralité de supports transversaux (3). Selon l'invention, pour améliorer les propriétés de la structure de base (1), en particulier en cas de collision latérale du véhicule automobile, au moins un support transversal (3) présente, dans la région de connexion (A) avec les longerons latéraux (2), un affaiblissement (5, 6, 7, 8).
PCT/EP2023/078924 2022-11-11 2023-10-18 Structure de base pour un corps d'un véhicule automobile à entraînement électrique WO2024099714A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022129907.4A DE102022129907B3 (de) 2022-11-11 2022-11-11 Bodenstruktur für eine Karosserie eines elektrisch antreibbaren Kraftwagens
DE102022129907.4 2022-11-11

Publications (1)

Publication Number Publication Date
WO2024099714A1 true WO2024099714A1 (fr) 2024-05-16

Family

ID=88469863

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/078924 WO2024099714A1 (fr) 2022-11-11 2023-10-18 Structure de base pour un corps d'un véhicule automobile à entraînement électrique

Country Status (2)

Country Link
DE (1) DE102022129907B3 (fr)
WO (1) WO2024099714A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8292356B2 (en) * 2009-03-17 2012-10-23 Mazda Motor Corporation Lower vehicle-body structure of vehicle
WO2018163815A1 (fr) * 2017-03-10 2018-09-13 マツダ株式会社 Structure inférieure de carrosserie de véhicule pour véhicule
FR3069224A1 (fr) * 2017-07-24 2019-01-25 Suzuki Motor Corporation Structure inferieure de vehicule
US20210031834A1 (en) * 2019-08-01 2021-02-04 Honda Motor Co., Ltd. Cross member structure of vehicle body
US20210070371A1 (en) * 2019-09-11 2021-03-11 Mazda Motor Corporation Vehicle-body structure of vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011051698A1 (de) 2011-07-08 2013-01-10 Thyssenkrupp Steel Europe Ag Bodenstruktur für ein Fahrzeug
DE102016110787A1 (de) 2016-06-13 2017-12-14 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Batteriegehäuse einer Traktionsbatterie eines Kraftfahrzeugs
DE102018206118A1 (de) 2018-04-20 2019-10-24 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeugkarosserieanordnung mit einer Speicherzellenbaueinheit
DE102020103240B3 (de) 2020-02-09 2021-06-24 Ford Global Technologies Llc Befestigungsvorrichtung einer zur Traktion eines Fahrzeugs, bevorzugt Elektrofahrzeugs dienenden elektrischen Energiequelle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8292356B2 (en) * 2009-03-17 2012-10-23 Mazda Motor Corporation Lower vehicle-body structure of vehicle
WO2018163815A1 (fr) * 2017-03-10 2018-09-13 マツダ株式会社 Structure inférieure de carrosserie de véhicule pour véhicule
FR3069224A1 (fr) * 2017-07-24 2019-01-25 Suzuki Motor Corporation Structure inferieure de vehicule
US20210031834A1 (en) * 2019-08-01 2021-02-04 Honda Motor Co., Ltd. Cross member structure of vehicle body
US20210070371A1 (en) * 2019-09-11 2021-03-11 Mazda Motor Corporation Vehicle-body structure of vehicle

Also Published As

Publication number Publication date
DE102022129907B3 (de) 2024-03-28

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