Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
  • B60R19/52—Radiator or grille guards ; Radiator grilles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
  • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
  • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
  • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
  • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
  • B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
  • B60R19/52—Radiator or grille guards ; Radiator grilles
  • B60R2019/525—Radiator grilles
  • B60R2019/527—Radiator grilles integral with bumpers

Definitions

• the invention relates to an energy absorber and an assembly consisting of an energy absorber and a rigid structure.
• parking shocks and pedestrian shocks are collectively referred to as "small shocks”.
• Small shocks are shocks with low kinetic energy sent, less than 1000 J, and to dissipate in the vehicle.
• Insurers seek in particular to know the impact of a collision to estimate the cost and calculate insurance premiums based on the price of repairs, and bodily injury resulting from different types of shocks likely to occur.
• shocks There are four main types of shocks:
• High speed shocks correspond to frontal shocks against an obstacle at a speed of approximately 60km / h
• pedestrian shocks 40km. h "1 but at low energy ( ⁇ 1000 J). pedestrian impact on the leg, it is the flexibility of the body that can best absorb this type of shock by limiting the damage to the body of a pedestrian (leg, hip, head).
• a shock module comprises a horizontal rigid structure called shock beam, coupled to insurance shock absorbers called crash boxes.
• small shocks ie low energy shocks (less than 1000 J) that are pedestrian shocks and parking shocks
• an absorber is located between the skin of the body and the rigid structure. It can be made of injected plastic material or foam (PPE: expanded polypropylene).
• EP 1 350 680 B1 entitled "Energy absorber for interposing between a rigid structure and a bumper skin”.
• shock absorber module is a set of elements whose association is intended to absorb all the shocks of different energies that a vehicle is likely to undergo, in order to minimize the consequences of these shocks.
• the device shown in EP 1 350 680 B1 can replace two devices by one, thus reducing costs, simplifying its implementation and decreasing the thickness required for installation, it has a lack of stability in the case of a shock having a lateral or vertical component: with such a shock, the device tends to slide along the rigid structure, which does not provide a good damping effect, and this lack of resistance causes a relative fragility of the bumper vis-à-vis a shock partly lateral.
• a shock with a vertical component may not be damped with great efficiency either, because of a slippage of the ribs on the bumper skin and in particular the rib intended to flare in the event of a frontal impact .
• the device does not always give the expected results because the behavior of the device is rarely exactly the one for which it was sized, since it flames too easily when it is desired that it compresses locally absorbing a maximum of energy.
• WO03072399.A2 discloses a bumper assembly for a motor vehicle front face with an energy absorber in the form of a lamella fixed projecting on a rigid element towards the front of the vehicle, along a horizontal line, inclined or not in one direction or the other, in order to absorb shocks with a pedestrian at a lower cost.
• the document US2009160203.A1 has a shock absorber for absorbing shocks with pedestrians.
• This absorber is mounted on the front face of a motor vehicle and comprises two transverse vertical walls interconnected by ribs.
• the invention aims to overcome these disadvantages by providing a continuous device just as simple and economical to set up, but which provides great stability to the shock absorber, regardless of the angle of impact. to which it is subject: purely frontal, or partially oblique.
• the object of the invention is a shock absorption module for a motor vehicle, comprising a rigid structure, that is to say a structure that does not deform under the effect of a small shock, intended to be positioned on the vehicle so that a front face of the rigid structure is facing an inner face of a body skin, said module comprises a small shock absorber consisting of a mold overmolded on the face front of the rigid structure, perpendicular to the rigid structure, the web is corrugated, that is to say that it is generated by translation of parallel generatrices in a directionally alternating increasing and decreasing curve along the front face of the rigid structure.
• the device of the invention can be implemented to absorb shocks on other parts the body of a vehicle, including the rear part of a vehicle.
• the term "alternately increasing and decreasing curve” means a curve which is carried by a generally planar bearing surface and which is alternately on one side and the other of the straight line of linear regression. said curve.
• the term "globally flat surface” means a surface that is either mathematically plane or locally assimilable to a mathematically spherical or cylindrical surface but with a large radius of curvature so that the bending of the surface does not prevent to consider it locally as flat.
• the term “perpendicular”, forming an angle of 90 °, with a tolerance of several tens of degrees, “perpendicular” means at least all angles between 75 ° and 105 °.
• a veil a material plate, that is to say whose length and width are much larger than the thickness and a veil is corrugated when it is generated by translation of parallel generatrices in a directional curve alternately increasing and decreasing along the front face of the rigid structure.
• width of a web the dimension of said web along the X axis.
• the guide curve is a sinusoid, which has the advantage of avoiding the buckling of the web in case of compression.
• the corrugations provide stability in compression, compared to horizontal lamellae.
• the guide curve of the shock absorber module is a sinusoid of minimum frequency to the middle of said rigid structure.
• the width of the web must be reduced in order to fit the curve of the vehicle.
• This reduction in web width results in a reduction in the absorption capacity of small impacts, which can be compensated for by increasing the frequency of the sinusoidal shape of the web as the width of said web decreases.
• the resistance to deformation of the wavy web may be identical along its longitudinal axis, and the shape of the web remains compatible with the front curve of the vehicle.
• the steering curve may be a regular sinusoid of constant amplitude and frequency (alternative not shown), which has the advantage of controlling the mechanical response of the device.
• the shock absorption module comprises strictions distributed along a web.
• This embodiment has the advantage of creating areas of weakness along the wavy veil, strictions whose number and thickness can calibrate the density of the absorber according to the energy we are looking for. to absorb. These zones of weakness are as many deformation initiation zones which make it possible to program the deformation and / or the rupture of the absorber to absorb the energy of small shocks.
• the shock absorption module has a shock absorbing capacity that can be adapted through the thickness of the veil, thanks to the width of the veil, thanks to the frequency of the undulations of the veil and thanks to the shape of said undulations, the wave form can be one of a sinusoid, a niche and broken lines.
• This embodiment has the advantage of being able to calibrate the shock absorber according to the power of the shocks we are trying to absorb.
• the shock absorption module has a symmetrical web with respect to the center of a front face of a rigid structure.
• This embodiment has the advantage of absorbing small shocks uniformly on each side of the front face.
• the shock absorption module is positioned at least partly behind a license plate.
• This embodiment has the advantage of protecting the bumper skin from the risk of marking in the event of frontal impact at very low speed, ie less than 4km / h.
• the shock absorption module has a corrugated web positioned in place of certain air guide partitions.
• This embodiment has the advantage of removing part of a part, which reduces the weight, cost and complexity of the realization of the final vehicle.
• the shock absorption module according to one of the preceding claims, with several corrugated sails positioned at different levels in a vertical plane on a front face of a rigid structure considering said structure. rigid in its final assembled position.
• This embodiment has the advantage of being able to calibrate the shock absorber according to the power of the shocks we seek to absorb through this device, as well as to distribute the energy of a shock on several vertically aligned points, which spread the impact of the impact on a pedestrian's body at several points, reducing the risk of injury.
• This molding tool comprises overmolding means which allows continuous overmoulding on a rigid structure, that is to say a structure that does not deform under the effect of a small shock, at least one veil corrugated, that is to say that said web is generated by translation of parallel generatrices in a directionally alternating increasing and decreasing curve along the front face of the rigid structure, perpendicular to said front face.
• overmolding means which allows continuous overmoulding on a rigid structure, that is to say a structure that does not deform under the effect of a small shock, at least one veil corrugated, that is to say that said web is generated by translation of parallel generatrices in a directionally alternating increasing and decreasing curve along the front face of the rigid structure, perpendicular to said front face.
• This procedure allows overmoulding by injection of material on a rigid structure, that is to say a structure that does not deform under the effect of a small shock, a wavy veil, that is to say that said web is generated by translation of parallel generatrices in an alternating and decreasing directional curve along the front face of the rigid structure.
• FIG. 1 is a perspective view of a shock absorption module 1 for a motor vehicle
• FIG. 2 is an enlargement of zone II of FIG.
• the shock absorber module 1 is positioned at the front of the vehicle, in front of the engine block (not shown), under the body skin (not shown), and is fixed on the longitudinal members (not shown) which are part of of the chassis.
• the shock absorber module 1 comprises two crash boxes 2 each positioned at one end of a rigid structure 3 on a rear face of the rigid structure 3. Said rear face is not visible on the 3D view of the figure 1 .
• the said crash boxes 2 are fixed in the continuity of the side members.
• the rigid structure 3 has a front face 4.
• Said front face 4 has a W-shaped section turned 90 ° forming a coated W.
• the coated W-shape is created from alternately horizontal and vertical portions whose surface is generally planar, said portions define seven alternately horizontal and vertical planes, thus creating two crenellations that surround a flat bottom groove.
• the outer surfaces of said flat bottom grooves are collectively referred to as the "front face” and the flat bottom of said groove is called “vertical surface”. Starting from the top to the bottom, the front face therefore has an upper front face 5, a vertical surface 6 and a lower end face 7.
• the vertical surface 6 is reinforced by a network of overmolded ribs 8 that strengthen the rigid structure 3.
• This network of ribs 8 is a triangular mesh network which extends over a length smaller than the total length of the rigid structure 3 and which is centered at Y0 along a longitudinal axis.
• the network of ribs 8 is not a web (that is to say a corrugated plate) within the meaning of the invention.
• the network of ribs 8 may be a haze within the meaning of the invention, as explained at the end of the description with respect to an embodiment not shown.
• Behind the rigid structure 3 is the part of the vehicle that supports the radiator, not shown.
• the legs 9, integral with the rigid structure 3, extend downward (in the use position of the module), just next to the crash boxes.
• the legs 9 extend under said rigid structure 3 and support a horizontal low support 10 which forms a convergent, that is to say an air guide which helps channel air entering the radiator (not shown) by the air inlet 1 1 located under the rigid structure 3.
• the convergent extends laterally to the wing supports (not shown). Due to its hollow shape, the convergent has a certain rigidity which allows it to constitute a low path of pedestrian shock absorption, as is known. This is why the convergent is an integral part of the shock absorption module 1.
• the main web 12 On the lower end face 7 of the rigid structure 3, is fixed horizontally, by overmolding, a main web 12, for the absorption of small shocks.
• the main web 12 has a vertical sinusoidal section with a higher frequency near the ends than in the center of the rigid structure 3. The densification of the main web 12 is thus higher on the sides of the rigid structure 3 in the middle of the rigid structure.
• the overmolding is carried out by injection under pressure of material in a mold whose footprint resumes, in hollow, the shape of the main veil 12 with restrictions 13.
• All the sails 12 and 15 have a sinusoidal section.
• the amplitude of the sinusoid is as great as possible, the width along the X axis of the webs 12 and 15 decreases in the direction that goes from the center to the sides of the device in order to follow the curve of the vehicle.
• the frequency of the sinusoidal shape that the webs 12 and 15 follow is increased towards the sides of the device. In the embodiment shown, there is continuity of material between the webs and the strips of material laid.
• the main sail 12 acts as an air guide partition vis-à-vis the air inlet 1 1 located under the rigid structure 3.
• the network of ribs 8 extends towards the front of the vehicle along the X axis, beyond the upper end face 5 and the lower end face 7.
• the ribs s' stop at the same level as the webs 12 and 15 and the network of ribs 8 thus extended forward also constitutes a haze within the meaning of the invention, capable of providing the energy absorber function for small shocks.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Vibration Dampers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=61132484

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (3)

• 2017
  • 2017-09-01 FR FR1758073A patent/FR3070646A1/fr active Pending
• 2018
  • 2018-08-30 EP EP18759122.7A patent/EP3676130A1/de not_active Withdrawn
  • 2018-08-30 MA MA050024A patent/MA50024A/fr unknown
  • 2018-08-30 WO PCT/EP2018/073325 patent/WO2019043090A1/fr unknown

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