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
  • B62D21/11—Understructures, i.e. chassis frame on which a vehicle body may be mounted with resilient means for suspension, e.g. of wheels or engine; sub-frames for mounting engine or suspensions
• • 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
  • B62D27/00—Connections between superstructure or understructure sub-units
  • B62D27/06—Connections between superstructure or understructure sub-units readily releasable
  • B62D27/065—Connections between superstructure or understructure sub-units readily releasable using screwthread

Definitions

• the present invention relates to the field of motor vehicles, more particularly the field of motor vehicle chassis.
• Motor vehicles have a rear axle generally fixed to a rear part of the body, and precisely fixed to rear side rails, commonly referred to as "spars".
• the latter include a usually restricted environment to receive the attachment with the rear axle.
• the attachment of the rear axle to the side members must be sufficiently compact and rigid to allow the absorption of possible rear shocks on the chassis of the motor vehicle.
• the published patent document FR 3 105 153 A1 discloses a rear part structure of a motor vehicle body comprising a rear axle fixed by means of fixing members presented, respectively, to the right of the side rails and to the right of the side rails arranged transversely to distance from said side rails.
• the present invention aims to overcome at least one of the disadvantages of the aforementioned state of the art. More particularly, the invention aims to propose a simple, efficient and economical solution making it possible to ensure optimal attachment of the rear axle to the structure of the motor vehicle and which guarantees endurance of the holding of said rear axle attachment, and this in a compact environment and without causing a increase in overall mass.
• the subject of the invention is a motor vehicle comprising:
• chassis comprising a rear part with two profiles extending longitudinally and parallel to each other;
• a rear axle comprising a cradle rigidly fixed to each of the two profiles, remarkable in that at least one attachment of the cradle to one of the profiles comprises a screw passing through the profile and engaging with a spacer inside the profile and a nut inside the profile, the spacer being arranged between, and against, a lower wall of the profile and a reinforcing tab, the nut being against said reinforcing tab opposite said spacer.
• the spacer is rigidly fixed to the lower wall, preferably by welding.
• the motor vehicle further comprising a reinforcement forming a profile of square cross section, with a first wall between the lower wall and a front face of the spacer and a second wall fixed against a side face of the spacer.
• the side face of the spacer is flat.
• the nut is housed in a cage fixed to the reinforcing tab, preferably by clipping.
• the reinforcing tab forms a bracket with a vertical wall fixed against a side wall of the profile, and a horizontal wall between the spacer and the nut.
• the reinforcement extends longitudinally along a length greater than or equal to a total longitudinal extent of the reinforcement tab and less than or equal to twice the said total longitudinal extent of the reinforcement tab.
• the spacer is fixed to the right of a central part of the extent of the reinforcement.
• the at least one fixing comprises two fixings forming a left rear fixing point and a right rear fixing point of the cradle on each of the two profiles, respectively.
• the invention also relates to a profile of hollow and closed section, for a motor vehicle chassis, comprising an orifice intended to receive a fixing screw, characterized in that the profile comprises a reinforcement fixed to a lower wall of the profile, a spacer located in the profile, a reinforcing tab fixed to the profile, and a nut resting on the reinforcing tab, and located in the profile, said nut being housed in a cage fixed to the reinforcing tab, said spacer comprising a fixed side face to a vertical wall of the reinforcement.
• Fixing the cradle of the rear axle to the profiles of the motor vehicle of the invention ensures optimal, light and space-saving fixing.
• the reinforcement extends longitudinally in an optimized manner, thus minimizing the total mass of the profile, leading to a reduction in associated costs.
• the spacer fixed by welding to the reinforcement, and resting against the reinforcement tab, ensures good endurance of the holding of the rear axle attachment to the structure of the motor vehicle.
• FIG 1 represents a bottom perspective view of a motor vehicle according to the invention
• FIG 2 represents a perspective view of a hollow section profile of a rear part of the vehicle chassis of Figure 1;
• FIG 3 represents a perspective view of a nut housed in a cage intended to be fixed to a reinforcing tab mounted on the profile of Figure 2;
• FIG. 1 represents a bottom perspective view of a motor vehicle 2 according to the invention.
• the motor vehicle 2 comprises a chassis 4 comprising a rear part 4.1 with two profiles 6, commonly referred to as "spars", extending longitudinally and parallel to each other.
• the cradle 8.1 preferably comprises two rear fixing points 10 corresponding to a right rear fixing point and a left rear attachment point.
• Each profile 6 comprises a lower wall 6.1 crossed by a fixing screw 12.
• the lower wall 6.1 comprises an orifice (not illustrated) intended to receive the screw 12.
• Figure 2 represents a perspective view of the profile 6 of the rear part 4.1 of the chassis 4 of the motor vehicle 2 of Figure 1.
• each of the two profiles 6 of the motor vehicle comprise a U-shaped hollow section.
• the hollow part 6.2 of the profile 6 is delimited, in the vertical direction Z illustrated in Figure 1, by the lower wall 6.1.
• the latter comprises a reinforcement 7 forming a profile of square cross section extending in the longitudinal direction.
• the screw 12 of the fixing 10 illustrated in Figure 1 extends vertically in the profile 6 passing successively through: the lower wall 6.1, the reinforcement 7, a spacer 16 arranged inside the profile 6, a tab of reinforcement 20 and a nut placed against said reinforcing tab 20.
• the spacer 16 is sandwiched between the reinforcing tab 20 and the reinforcement 7.
• the reinforcement 7 comprises a first wall 7.1 fixed by welding to the lower wall 6.1 of the profile 6, and the tab 20 comprises a wall horizontal 20.1 arranged between the spacer 16 and the nut 18 visible in Figure 3.
• Figure 3 represents a perspective view of the nut 18 housed in a cage 14 intended to be fixed to the reinforcing tab 20.
• the cage 14 is preferably a plastic part making it possible to hold the nut 18 on the tab 20.
• the cage 14 advantageously comprises two clips 14.1 having a V shape and intended to pass through the reinforcing tab so as to ensure effective retention of the nut 18.
• the clips 14.1 extend vertically towards the lower wall 6.1 also make it possible to maintain in position and limit the movements of the spacer 16 in the hollow part 6.2 prior to fixing the assembly by means of the screw.
• the screw 12 of the fixing 10 of Figure 1 passes completely and vertically through the spacer 16, the nut 18 and the cage 14.
• the tab 20 forms a bracket with, in addition, a vertical wall 20.2 directly fixed to a side wall 6.3 of the profile 6.
• the spacer 16 comprises a front face 16.1 bearing against the first wall 7.1 of the reinforcement 7.
• the latter also comprising a second wall 7.2 fixed against a side face 16.2 of the spacer 16.
• the second wall 7.2 extends perpendicularly to the first wall 7.1.
• the spacer 16 preferably comprises a rectangular parallelepiped shape. More preferably, the spacer 16 comprises a cubic shape. Thus, the side face 16.2 of the spacer 16 is flat.
• the spacer 16 is preferably rigidly fixed by welding to the first 7.1 and second walls 7.2 of the reinforcement 7. In this configuration, a weld bead can be placed at each junction between lateral faces of the spacer 16 with the walls 7.1, 7.2 of the reinforcement 7.
• the vertical support of the spacer 16 against the reinforcing tab 20 as well as its rigid fixation on the reinforcement 7 makes it possible to improve the resistance of the assembly against axial and radial forces, and thus to ensure good endurance of the holding of the rear axle attachment to the structure of the motor vehicle.
• the reinforcement 7 extends longitudinally along a length i greater than or equal to a total longitudinal extent j of the reinforcement tab 20 and less than or equal to twice the said total longitudinal extent j of the tab 20.
• the length i of the reinforcement 7 is between 40 mm and 200 mm.
• the spacer 16 is fixed to the right of a central part of the extent i of the reinforcement 7.
• the reinforcement 7 extends longitudinally in the profile 6 in an optimized manner, minimizing the total mass of said profile 6 and thus that of the motor vehicle, leading to a reduction in associated costs.
• the profile 6 of the invention makes it possible to fix the cradle of the rear axle on the motor vehicle effectively with firm support of the nut on the reinforcing tab guaranteeing good endurance of the fixing, and this by means of a optimized reinforcement, thus guaranteeing lightness to the assembly of the motor vehicle.

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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=86100100

Family Applications (1)

Country Status (4)

Family Cites Families (6)

• 2022
  • 2022-12-09 FR FR2213045A patent/FR3142985A1/fr active Pending
• 2023
  • 2023-11-07 EP EP23813807.7A patent/EP4630309A1/de active Pending
  • 2023-11-07 WO PCT/FR2023/051745 patent/WO2024121474A1/fr not_active Ceased
  • 2023-11-07 CN CN202380084461.9A patent/CN120344442A/zh active Pending

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