EP3164319A1 - Improved reinforcing transverse cross-member for lateral and frontal impacts - Google Patents
Improved reinforcing transverse cross-member for lateral and frontal impactsInfo
- Publication number
- EP3164319A1 EP3164319A1 EP15756947.6A EP15756947A EP3164319A1 EP 3164319 A1 EP3164319 A1 EP 3164319A1 EP 15756947 A EP15756947 A EP 15756947A EP 3164319 A1 EP3164319 A1 EP 3164319A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- floor
- vehicle
- extension
- main part
- lateral
- 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- Withdrawn
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
- B62D25/20—Floors or bottom sub-units
-
- 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
Definitions
- the invention relates to a vehicle structure intended to resist in the event of a side impact, and in particular a reinforcing cross member for lateral impact.
- the body structure of a vehicle is designed to absorb as much energy as possible during an impact.
- the cockpit In the case of a side impact, the cockpit must remain relatively preserved to protect its occupants.
- the motor vehicles comprise at least one transverse reinforcing cross member located on the floor of the vehicle, on the side of the passenger compartment. This crossbar extends from one lateral side of the vehicle to the other lateral side, substantially perpendicular to the longitudinal axis of the vehicle.
- the current trend is to strengthen the reinforcing beam located against the floor of the vehicle.
- patent application EP0799757 discloses a floor reinforcement cross member for lateral impact, extending between each lateral side of the vehicle.
- the transverse cross member has an inverted U shape, the ends of the legs of the U being fixed on the floor surface and the ends of the cross member being fixed to the side rails of the vehicle.
- the cross is positioned vis-à-vis the middle feet of the vehicle structure.
- the rear attachments of the front seats are attached to the transom.
- the disadvantage of this solution is that in case of front impact, the front seats, whose rear attachment to the floor is made on the cross, generate pulling forces on said floor of the vehicle.
- the cross is dimensioned to withstand the compression forces for the side impact.
- the pulling forces generated by the front seats at their rear attachments will deform the cross member.
- the seats may move by deformation of the cross member and the floor at their rear attachment points. These movements of the front seats and the deformation of the floor behind the seats increase the risk of injury to front and rear passengers.
- the position of the cross member inside the vehicle reduces the space available for the feet of the rear passengers.
- the present invention aims to improve the safety of the vehicle in case of impact.
- Another object of the invention is to reduce the impact on the living space, particularly at the feet of the rear passengers, reinforcing elements of the floor of a vehicle.
- a cross member intended to be installed on the surface of a vehicle floor, characterized in that it comprises a main part extending in a first main direction and intended to extend between elements of the lateral structure of said vehicle, and at least one extension extending in a second direction of extension different from the main direction.
- the main part reinforces the floor in the event of a side impact
- the extension reinforces the floor around said cross-member vis-à-vis the forces perpendicular to the floor distributing said forces over a larger area in the event of a frontal impact.
- the rear fasteners of the front seats will transmit efforts on the floor.
- These forces have a component perpendicular to the large floor, which tends to pull on said floor and from the pivoting of the seats along an axis of rotation parallel to the transverse axis of the vehicle.
- the extension extends perpendicular to the main direction of said crossbar from the middle of said main part, the middle of said main part being the middle of the length of the main part following the main direction.
- a segment of the middle of the main part follows a " ⁇ " curve shape extending in a plane different from the plane defined by the main direction and the direction of extension, arranged to follow the shape of the floor of the vehicle when said floor comprises a tunnel along the longitudinal median axis of the vehicle.
- the cross-member can thus strengthen the tunnel of the floor. Indeed, in case of side impact on a vehicle with a floor with a central tunnel, the tunnel creates a fragile area that will quickly deform, and cause a deformation of the entire floor. The width of the passenger compartment will decrease.
- the crossbar reinforces the resistance of the floor at the level of the tunnel in the event of a side impact, and retards its deformation, while maintaining a space in the tunnel for the passage of technical elements of the vehicle, such as an exhaust pipe, pipes or a transmission shaft.
- this " ⁇ " shape creates an area less resistant than the rest of the crossbar, because of the curvature.
- each of the lateral arms of the cross member When the cross member is attached to a vehicle floor having a tunnel, each of the lateral arms of the cross member is generally located substantially at the level of the floor area on which is placed one of the front seats.
- the fragility created by the " ⁇ " shape prevents one of the arms from breaking or deforming, and thus avoiding to reduce the area of the floor on which a seat is fixed. Once the body has broken or distorted at the " ⁇ " shape, the arms will continue to strengthen the parts of the floor to which they are attached. Passenger safety is improved.
- said extension In the case where the crosspiece comprises only one extension, said extension is preferably positioned at least partly at the level of the curved shape. " ⁇ ".
- the extension increases the inertia of the portion of the cross in the form of " ⁇ ", and thus to allow said cross to spend more effort.
- the width of the extension that is to say the dimension of the extension in the main direction of the cross-member, is greater than the length of the segment of the cross-member running in the shape in " ⁇ ", that is to say its dimension in the main direction of the cross in following the shape of the " ⁇ ".
- the cross member comprises at least one body of composite material.
- the use of a composite material makes it possible to make a cross body lighter than a steel cross member, while being rigid.
- the body forms at least a portion of the main portion and the extension, and deformable tips are attached to the ends of said body, said ends being intended to connect said ends of the body to the elements. of the lateral structure of the vehicle, in particular the longitudinal members.
- the composite materials may have low deformation capacity, in particular in flexion or torsion when they are subjected at the same time to a compressive force, the deformable tips placed at the ends of the body and intended to connect the cross member to the lateral structure of the vehicle, advantageously make it possible to pass essentially only the compression forces in the body, the other forces, such as, for example, the bending forces related to the rotation of the lateral structure elements of the vehicle on which the crossmember is connected, being absorbed by the deformation of said tips. The risks that the body of composite material is broken down are thus reduced.
- the body is configured so that its ends are not in contact with the elements of the lateral structure of the vehicle, the connection between said ends of the body and the elements of the lateral structure of the vehicle being made by the end pieces.
- the cross member of composite material is lightweight, resistant, and allows the deformations at these connections with the structural elements of the vehicle.
- the impacted spar can rotate on itself along the longitudinal axis of the vehicle. If each end piece is attached to each lateral side member of the vehicle, the cross member is placed along the transverse axis of the vehicle. vehicle, the rotation of the impacted spar creates shear forces that will deform the end pieces. This deformation of the end caps limits the forces associated with said rotation of the spar which are transmitted to the body. The body thus essentially receives compression forces in the transverse direction of the vehicle and little effort in other directions.
- the crossbar is better resistant to the forces of a side impact.
- the end pieces allow to absorb some of the forces of the shock in the transverse direction of the vehicle. Thus, in the event of a side impact, part of the energy of the impact is dissipated in the deformation of said end pieces. The efforts transmitted to the body are diminished.
- the end pieces are made of metallic material.
- the metal provides good mechanical strength and good ability to deform without breaking.
- the end pieces may be fixed by gluing, riveting, or any other fixing means known to those skilled in the art.
- the tips can be made of steel for easier shaping or for a low cost, or aluminum to reduce the weight.
- the endpieces have zones of rupture programmed so as to allow deformation of said end pieces.
- the deformation of the tip is better control.
- Several programmed break zones can be applied.
- surfaces of the cross member may have an "accordion" type shape to allow controlled deformation of the tip.
- the invention also relates to a vehicle floor having a cross member as described above.
- the floor is made of composite material.
- the floor equipped with the crossbar is light.
- the invention also relates to a vehicle comprising a floor as described above and whose cross is disposed on the face of the floor located on the outside of the vehicle.
- a vehicle comprising a floor as described above and whose cross is disposed on the face of the floor located on the outside of the vehicle.
- the vehicle comprises a heel board connected to the floor, and the extension extends to the connection of the floor with the heel board.
- this arrangement makes it possible to transfer the pulling forces resulting from the rear attachments of the front seats towards the heel board.
- the risk of deformation or even tearing of the floor are reduced.
- the resistance of the floor is increased and the safety of the vehicle improved.
- the invention also relates to a method of manufacturing a vehicle comprising a floor equipped with a cross member as described above and comprising a body and end pieces, comprising at least the following steps:
- the manufacturing process will follow the steps in this order: fixing the body on the floor, laying and fixing the floor on the edges of the beams for receiving said floor, the edges of the side members being oriented towards the roof of the vehicle so the floor is placed on said longitudinal members, and mounting of the end pieces between the body and said longitudinal members.
- the end pieces can in addition be fixed to the floor.
- - Fig. 1 is a perspective view of a cross member according to one embodiment of the invention.
- - Fig. 2 is from below a vehicle floor with a cross member comprising a body as described in fig.l and end caps, the floor and the end pieces being connected to side rails of the structure of a vehicle.
- FIG. 3 is a view of one end of the body equipped with a nozzle according to a particular embodiment of the invention.
- - Fig. 4 is a view from below of a vehicle whose floor includes a cross member with a body which has an extension directed rearward of the floor of the vehicle, in the central zone of said body.
- Fig. 1 shows a vehicle floor reinforcement cross-member 1, intended to be placed on the outside surface of a vehicle floor 2 which comprises a central tunnel, between side rails (not shown in FIG 1) of the structure of the vehicle. vehicle.
- the crosspiece 1 comprises at these ends endpieces 12.
- Said crosspiece 1 comprises a main portion extending in a main direction defined by a straight line passing through said end pieces 12, and an extension 17, extending in a direction of extension perpendicular to the main direction.
- the extension 17 extends from a middle zone of the main part, the middle of the main part being defined by the middle of the length of the main part in the main direction.
- the cross member 2 comprises a body 11 forming the main part and the extension, and end pieces 12.
- the body 11 is made of composite material, and the end pieces 12 of metal material.
- the composite material may be for example a material called SMC composite which is a thermoset semi-product consisting of a web of cut or continuous son impregnated with a mixture of polyester resin, fillers and various adjuvants.
- the cross-member 1 has a generally U-shaped cross-section, and has a curved central zone 13, forming an " ⁇ ", substantially at the middle of the length of the main portion, intended to follow the floor shape when said floor comprises a central tunnel forming a convex side convex side of the vehicle and extending along the longitudinal axis of the vehicle.
- the cross section "U" of the cross member 1 is of variable width, the width of the "U” being the distance between the branches of the "U", so as to form the extension 17.
- the ends of the "U" shape of the section of the cross member 1 has fallen edges forming surfaces arranged to be pressed against the floor and intended to receive floor fastening means.
- the "U" shape of the section of the cross member 1 corresponds to a shape comprising two parallel branches interconnected by a base.
- Said base of the "U” shape is of substantially planar shape and may comprise in places depressions 15. These depressions 15 make it possible to stiffen the crossbar 1.
- Other forms for the base of the "U” are possible in order to give the particular properties locally or globally at the crossing.
- Fig. 2 shows the crossbar 1 mounted on a floor 2 of the vehicle.
- the floor 2 is positioned between two longitudinal members 31.
- the length of the body 11, that is to say its dimension in the main direction, is less than the spacing between the two longitudinal members 31.
- the body 11 is fixed to the floor 2 before mounting the floor on the vehicle. Then the floor 2 is installed on the vehicle so as to be supported by the longitudinal members 31.
- the body 11 can be fixed to the floor by gluing or riveting.
- Other fastening means known to those skilled in the art can be used, for example in the case of a floor 2 made of composite material, by welding by melting the resin of the composite material of the body 11 and that of the floor 2 then plating the two pieces together until the material cools.
- the body 11 does not have a curved area in the form of " ⁇ ", so as to follow the flat shape of the floor 2.
- the body 11 can be made with the floor 2 and thus be an integral part of said floor 2.
- Each end of the body 11 is connected to one of the longitudinal members 31 by means of one of the endpieces 12.
- the length of the body 11 will be chosen so as to leave a space between each end of the body 11 and each spar 31.
- the body 11 and the end pieces 12 form the cross member 1 which therefore extends between the two longitudinal members 31 along the transverse axis of the vehicle.
- the end pieces 12 are preferably arranged so as to be deformed in case of side impact. They can be made for example made of sheet steel.
- the end pieces 12 may have shapes with programmed deformation zones, such as for example a shape having accordion edges as illustrated in FIG. 3, to control the deformation of the tips 12.
- the body 11 is made of composite material, it has good resistance to compressive forces.
- the resistance of said body 11 is bad when, in addition to the compression forces, forces in different directions to these compressive forces, such as bending or twisting, act on said body 11.
- the floor 2 of FIG. 2 has a central tunnel.
- the body 11 has a central zone 13 traversing an " ⁇ " shape so as to follow the central tunnel, the two parts of the body 11 around the central zone 13 forming arms 14.
- This shape makes it possible to improve the rigidity of the floor 2 at the tunnel in the event of a side impact. It also makes it possible to create a zone of rupture programmed thanks to this " ⁇ " shape when the forces become too great, and to impose that the body 11 breaks or is deformed in the central zone 13 and not at the level of one of the arm 14.
- the central zone 13 of the body 11 is located substantially in the longitudinal and median axis of the vehicle, the arms are substantially under the front passenger seats. In case of significant side impact, the body 11 will break in its central part at the " ⁇ ", but the arms 14 will remain intact. The arms 14 will thus prevent the reduction of the space containing the seats above each of said arms 14, and thus improve the protection of passengers sitting in said seats.
- said body may comprise means of deformation or programmed rupture, such as, for example, localized decreases in thickness or a local decrease in the section. 11.
- the body 11 may travel in an " ⁇ " shape on a segment located in the middle but positioned in a plane substantially parallel to the floor 2 of the vehicle when said body 11 is fixed on the floor.
- the cross member 1 can be positioned on the floor 2 of the passenger side of the vehicle.
- Fig. 4 shows a floor 2 of vehicle equipped with a cross member 1, the body 11 has the extension 17.
- This extension 17 preferably extends towards the rear of the vehicle when the crossbar 1 is fixed on the vehicle.
- the extension 17 s preferably extends to the floor area 2 connected to said heel board.
- the rear fasteners of the front seats generate traction forces on the floor 2 of the vehicle, traction forces directed towards the passenger compartment of the vehicle and seeking to lift the floor 2.
- These traction forces applying to the floor 2 are taken up by the cross 1.
- the extension 17 allows to transmit these forces from the seats to the heel board and thus increase the resistance of the floor 2 vis-à-vis these traction forces.
- the crossbar 1 is preferably positioned so as to be substantially vis-à-vis with the central feet of the vehicle structure so as to recover the forces in the event of a side impact.
- Other positions along the longitudinal axis of the vehicle when the floor is installed on a vehicle can be considered.
- the width of the extension 17, that is to say its dimension along the transverse axis of the vehicle when the crossbar 1 is installed on the vehicle 2, is greater than the length of the central zone 13 shaped of " ⁇ ", that is to say the size of said central zone 13 along the main direction of the cross member, substantially parallel to the transverse axis of the vehicle when the cross member 11 is installed on the vehicle.
- the extension 17 also makes it possible to increase the cross-sectional area of the cross-member 1 at the level of the central zone 13.
- the capacity of the central zone 13 has withstood the forces in the event of a side-impact is thus improved.
- the crossmember may comprise several extensions 17.
- the crossmember 1 may comprise two extensions 17 positioned on either side of the middle of the main part of the crossmember 1 and giving said crossmember 1 a "TT" shape. ".
- the body 11 may comprise reinforcing ribs in the volume defined by its section "U” so as to increase the rigidity of said body 11.
- each endpiece 12 is positioned between one of the ends of the body 11 and one of the longitudinal members 31, fixed to the body 11 and the spar 31, and possibly also fixed to the floor 2.
- the floor 2 can be first fixed to the longitudinal members 31, then the body of the cross member is fixed to the floor 2. Finally, each end piece 12 is positioned between one of the ends of the body 11 and one of the longitudinal members 31, fixed to the body 11 and the spar 31, and possibly also to the floor 2.
- the floor 2 is fixed to the longitudinal members 31, then the end pieces 12 are fixed on the body 11, and finally the crossmember 1 is fixed to the floor 2 and to the longitudinal members 31, the ends 12 making the connection between the body 11 and the longitudinal members 31.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1456497A FR3023251B1 (en) | 2014-07-04 | 2014-07-04 | IMPROVED CROSSROAD STRAP FOR SIDE SHOCK AND FRONT SHOCK |
PCT/FR2015/051639 WO2016001509A1 (en) | 2014-07-04 | 2015-06-19 | Improved reinforcing transverse cross-member for lateral and frontal impacts |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3164319A1 true EP3164319A1 (en) | 2017-05-10 |
Family
ID=51570667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15756947.6A Withdrawn EP3164319A1 (en) | 2014-07-04 | 2015-06-19 | Improved reinforcing transverse cross-member for lateral and frontal impacts |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3164319A1 (en) |
FR (1) | FR3023251B1 (en) |
WO (1) | WO2016001509A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015106272A1 (en) * | 2015-04-23 | 2016-10-27 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Floor structure of a motor vehicle |
FR3082494B1 (en) | 2018-06-19 | 2021-05-14 | Psa Automobiles Sa | MOTOR VEHICLE CHASSIS, INCLUDING A MEANS OF DISTRIBUTION AGAINST A TUNNEL OF A FORCE APPLIED BY A CROSSMOUNT IN THE EVENT OF SIDE IMPACT. |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3198960B2 (en) | 1996-04-04 | 2001-08-13 | トヨタ自動車株式会社 | Lower body structure of vehicle |
DE102006015872A1 (en) * | 2006-04-05 | 2007-10-18 | GM Global Technology Operations, Inc., Detroit | Motor vehicle e.g. car, for passengers, has transverse reinforcement component arranged between connection components, where component has wave-like profile with wave crest aligned transverse to vehicle longitudinal direction |
JP2009029244A (en) * | 2007-07-26 | 2009-02-12 | Toyota Motor Corp | Vehicle body structure |
US7854472B2 (en) * | 2007-10-22 | 2010-12-21 | Honda Motor Co., Ltd. | Vehicle body structure |
US7828370B2 (en) * | 2007-10-25 | 2010-11-09 | Honda Motor Co., Ltd. | Vehicle body structure |
DE102009015355A1 (en) * | 2009-03-27 | 2010-09-30 | Audi Ag | Base structure for motor vehicle, is made of fiber composite material, and change in cross-section is formed, such that crash behavior of base structure is controlled |
FR2960506A1 (en) * | 2010-05-28 | 2011-12-02 | 4C Ecomobile | Ecological modular vehicle e.g. compact car, for urban utilization, has beam with fixation arrangements for mounting modules on beam, where modules are front module to receive front gear, floor module and rear module to receive rear gear |
JP5278612B1 (en) * | 2011-08-15 | 2013-09-04 | トヨタ自動車株式会社 | Vehicle lower structure |
FR2991651B1 (en) * | 2012-06-07 | 2014-06-20 | Peugeot Citroen Automobiles Sa | DASHBOARD TRAVERSE FOR VEHICLE |
US20140049033A1 (en) * | 2012-08-17 | 2014-02-20 | Daimler Trucks North America Llc | Composite box frame |
-
2014
- 2014-07-04 FR FR1456497A patent/FR3023251B1/en active Active
-
2015
- 2015-06-19 EP EP15756947.6A patent/EP3164319A1/en not_active Withdrawn
- 2015-06-19 WO PCT/FR2015/051639 patent/WO2016001509A1/en active Application Filing
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2016001509A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR3023251B1 (en) | 2018-01-19 |
FR3023251A1 (en) | 2016-01-08 |
WO2016001509A1 (en) | 2016-01-07 |
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