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
  • B62D25/08—Front or rear portions
• • 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
• • 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
  • B62D21/152—Front or rear frames

Definitions

• the invention lies in the field of rear vehicle chassis and more particularly the central beams of such chassis.
• the rear frame of a vehicle is a lower structure that supports the rear part.
• the latter is generally composed of two lateral beams extending in the longitudinal direction of the vehicle and interconnected by at least two crosspieces.
• the vehicle space defined and supported by the sleepers and the side beams generally corresponds to the trunk, but may also correspond to the bucket of a pickup type vehicle as described in the document EP0723904.
• the rear frame is generally closed at the bottom by a lower floor. During a shock at the rear of the vehicle, the rear frame and in particular the rear crossmember will be caused to deform towards the front. This deformation will result in an intrusion into the cabin elements that may injure passengers sitting in the back.
• a rear shock absorption device may be present at the rear frame and comprises in known manner a central beam disposed between the two lateral beams and connecting the front cross member and the rear cross member. This central beam absorbs the energy of the shock thanks to a longitudinal deformation.
• Such a device is shown for example in US6206461 and consists of a central beam whose front end flares laterally gradually and the rear end expands staggered.
• the configuration of this central beam ensures good lateral support against each cross.
• Document EP1424266 describes an anti-collision box which bears against the rear end of the central beam, and which supports a bumper beam.
• This anti-collision box is in the form of a "crash box” and absorbs shock by longitudinal deformation. Its function is to pre-absorb the forces from a rear impact, before they reach the central beam.
• the document KR101006053 presents crash-type dampers designed to prevent abnormal noise during their deformation, thanks to an expanded aluminum foam fastener present within them by means of clamps. It has been observed that during a rear impact, the central beam is not correctly maintained in position according to certain directions of effort, and in particular in the vertical direction, while the vertical forces are the most consistent. The central beam then risks to rise in its rear part, decreasing its effectiveness of absorption of the energy of the rear impact.
• the object of the invention is to respond to at least one of the problems encountered in the prior art by proposing a new rear chassis center beam having better control in the event of longitudinal deformation.
• the invention relates to a vehicle comprising a rear frame having two lateral beams oriented in the longitudinal direction of the vehicle between which is disposed parallel to a central beam, said central beam being in the form of a hollow profile so to present a central channel passing therethrough longitudinally and having a front portion and a rear portion in the longitudinal direction of the vehicle, the vehicle being remarkable in that said central beam comprises a reinforcing profile nested in its rear portion and attached to it.
• the reinforcing profile may comprise one or the other of the following characteristics taken separately or in any combination possible:
• the reinforcing profile is attached to the side walls of the central beam.
• the height of the reinforcement profile is less than or equal to half the height of the central beam and / or the length of the reinforcement profile is less than or equal to half the length of the central beam.
• the height of the reinforcement profile is less than or equal to half the height of the central beam and the reinforcing section is disposed below the median horizontal plane of the central beam.
• the reinforcement profile is in the form of a flat tube arranged parallel to the central beam or in the form of a U-shaped profile open downwardly arranged parallel to the central beam.
• the central beam and the reinforcing profile are both in the form of a U-shaped profile open downwards.
• the reinforcing profile comprising at least one upper wall and two side walls, the vehicle is remarkable in that the reinforcing profile comprises at least one perforation cut in at least one of its walls.
• said or at least one of said openwork is cut on two walls at the edge joining these two walls.
• one of the two walls is the top wall and the other is one of the two side walls of the reinforcing section, the reinforcing section is fixed by welding to the central beam.
• the central beam comprising at least one upper wall and two side walls
• the vehicle is remarkable in that the central beam comprises at least one perforation cut in at least one of its walls at the its rear part surrounding the reinforcing profile.
• said or at least one of said openwork is cut on two walls at the edge joining these two walls. More preferably, one of the two walls is the top wall and the other is one of the two side walls of the central beam.
• the invention proposes to fix a reinforcing profile inside the rear end of the central beam so as to reinforce the rigidity of the central beam in this area.
• the central beam of the invention has an asymmetrical longitudinal deformation capacity, so that the latter is greater in the front part than in the rear part of the central beam.
• the invention also relates to a central beam of a vehicle rear frame as defined above.
• FIG. 1 represents an upper rear view of a vehicle according to the invention comprising a central beam associated with a reinforcement.
• Figure 2 shows a rear view of a central beam according to the invention.
• understand is synonymous with “include” and is not limiting in that it allows the presence of other elements in the vehicle or the central beam to which it relates. It is understood that the term “understand” includes the words “consist of”.
• front and “rear” as well as the “longitudinal” and “transverse” directions will be understood in relation to the general orientation of the vehicle.
• the terms “low” and “lower” will indicate a greater proximity to the ground than the terms “high” and “higher” respectively.
• the same references designate identical or similar elements.
• Figure 1 shows an upper rear view of a vehicle 1 according to the invention, and showing a rear frame 3 comprising two lateral beams (5, 7) oriented in the longitudinal direction of the vehicle 1.
• These two beams (5, 7) are interconnected by two cross members (9, 1 1), one of which is located near the rear ends of the two lateral beams (5, 7), hereinafter referred to as the rear cross member 1 1, and Another is placed further forward, hereinafter called front cross member 9.
• the space defined and supported by the two side beams (5, 7) and the two crosspieces (9, 1 1) corresponds to trunk of the vehicle 1. This space is closed in the lower part by a lower floor 13.
• a central beam 15 is disposed between the two lateral beams (5, 7) and extends parallel to them.
• the central beam 15 comprises a front end connected to the cross member 9 before and a rear end connected to the cross 1 1 rear.
• the central beam further comprises a rear portion which is understood as extending from its rear end to the median transverse plane of the central beam, and a front portion extending from its front end to the median transverse plane of the central beam.
• the central beam 15 is a profile comprising an upper wall 17 and possibly a bottom wall (not visible) along a vertical axis. It also includes two walls lateral 19 each facing one side of the vehicle 1, or facing each of one of said side beams (5, 7).
• the central beam 15 is hollow in that it comprises a central channel 21 passing longitudinally on both sides.
• the vehicle 1 is remarkable in that said central beam 15 comprises inside its rear portion a reinforcing profile 23 attached to at least one of the walls of the central channel 21 of said central beam 15.
• a profile reinforcement 23 makes it possible to create a rise in force during a rear impact on the vehicle 1, before the central beam 15 is deformed to absorb the forces of the rear impact.
• the central beam has less risk of lifting and is better maintained during its deformation.
• the reinforcement profile 23 has dimensions smaller than the central beam 15.
• the height and the length of the reinforcement profile 23 are respectively lower than those of the central beam 15.
• the function of the reinforcement profile 23 reinforcement profile 23 being to cause a rise in force during a rear impact, it is preferable that these dimensions are smaller than those of the central beam 15 so as not to stiffen the latter.
• the length of the reinforcement profile 23 may be less than or equal to half that of the central beam 15, or less than or equal to one third of that of the central beam 15, or even less than or equal to one quarter of that of the central beam 15.
• the reinforcing section 23 has a height less than or equal to half that of the central beam 15.
• the reinforcing section 23 is disposed below the median horizontal plane of the central beam 15 so as to be closer to the bottom than the top of the central beam 15. This arrangement can channel the forces received during the impact in the direction of the ground, or towards the lower floor. Directing the forces received in the direction of the ground makes it possible to participate in limiting or preventing the lifting of the central beam during its deformation.
• the reinforcing profile 23 may be attached to the central beam 15 by any means. For example, it can be fixed by welding or screwing, preferably it is fixed by welding.
• the reinforcing section 23 is preferably not fixed to all the walls of the central beam 15.
• the reinforcing section 23 is attached to the side walls of the central beam
• the reinforcement profile 23 is in the same shape or a shape similar to the central beam 15.
• the reinforcing section 23 is in the form of a flat tube positioned parallel to the beam central 15.
• the reinforcing section 23 is in the form of a U-shaped profile open downwards and disposed nested in the central beam 15.
• the reinforcing section 23 thus has a wall 25 and two side walls 27, as shown in Figure 2.
• the central beam 15 is also in the form of a U-profile open downward so that it does not include a bottom wall .
• Such a configuration of the central beam 15 and the reinforcement profile 23 improves the deformation and energy absorption qualities of these elements, in comparison with a closed configuration on all sides. Having the opening downward limit see avoids the risk of contact of the central beam 15 and / or the reinforcement profile 23 with the lower floor 13 during their deformation.
• the central beam 15 comprises at least one perforation 29 cut in one of the walls of the rear part of the central beam 15 surrounding the reinforcement section 23, creating a zone of weakening of the rigidity
• this or at least one of the perforations 29 is positioned at a longitudinal edge of the central beam 15 joining two walls. More preferably, this stop is an upper edge forming wedge between the upper wall 17 and one of the two side walls 19, in particular when the central beam is in the form of a U-shaped profile open downwards.
• cut-outs 29 are preferably arranged symmetrically on either side of the longitudinal axis of the central beam 15 so as to form pairs of cutouts 29.
• the central beam may also include other cutouts cut out of the rear portion surrounding the reinforcing section.
• the central beam may comprise at least one openwork in the front part, the one or more said cuts facilitating the longitudinal deformation of the central beam and participating in the absorption capacity of the forces of the central beam.
• the reinforcing section 23 comprises at least one perforation 31 cut in one of its walls. Preferably, this or at least one of the perforations 31 is positioned at a longitudinal edge of the reinforcing section 23 joining two walls.
• this stop is an upper stop wedge between the upper wall 25 and one of the two side walls 27, especially when the reinforcing profile 23 is in the form of a U-shaped profile open downwards.
• the perforation (s) (29, 31) of the central beam 15 and the reinforcing section 23 are positioned at the same level in the longitudinal direction of the vehicle 1.
• they are preferably arranged symmetrically on either side of the longitudinal axis of the reinforcement section 23 so as to form pairs of cut-outs 31.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=58779223

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (8)

• 2017
  • 2017-04-06 FR FR1752990A patent/FR3064969B1/fr active Active
• 2018
  • 2018-03-06 CN CN201880023868.XA patent/CN110494346A/zh active Pending
  • 2018-03-06 WO PCT/FR2018/050503 patent/WO2018185388A1/fr unknown
  • 2018-03-06 MA MA049027A patent/MA49027A/fr unknown
  • 2018-03-06 EP EP18712955.6A patent/EP3606805A1/de not_active Withdrawn

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