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
  • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
  • B60R19/24—Arrangements for mounting bumpers on vehicles
  • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
  • B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F7/00—Vibration-dampers; Shock-absorbers
  • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
  • F16F7/124—Vibration-dampers; Shock-absorbers using plastic deformation of members characterised by their special construction from fibre-reinforced plastics

Definitions

• the present invention relates to a power absorber device capable of providing protection in the event of a particularly frontal impact on a motor vehicle. More particularly, the invention relates to an energy absorber device for a motor vehicle bumper beam disposed between the bumper beam and the end of a vehicle spar opposite the bumper beam.
• the present invention therefore relates to an energy absorber device for a bumper beam of a motor vehicle, said energy absorber device being intended to make the connection between a bumper beam and the end of a vehicle spar next to of the bumper beam, the energy absorber device comprising at least a first zone made of a non-reinforced polymer material and at least a second zone made of a reinforced polymer material comprising fibers.
• first zone made of an unreinforced polymer material and at least a second zone made of fiber-reinforced polymer material, retains a good lightness while being able to absorb more energy from possible shocks and all having better resistance to low energy shocks.
• the reinforced polymer material comprises glass fibers or carbon fibers. According to another aspect of the invention, the reinforced polymeric material comprises continuous fibers or staple fibers.
• the non-reinforced polymer material of the first portion is selected from polypropylene and polyamide.
• the reinforced polymer material of the second portion comprises polypropylene or polyamide.
• the energy absorbing device comprises: a base for attachment to a vehicle spar; 0 a hollow outer shell, and
• the fixing base and the outer hollow shell are made of non-reinforced polymer material and the inner walls are made of reinforced polymer material.
• the hollow outer envelope is made of unreinforced polymer material and the fixing base and the inner walls are made of reinforced polymer material.
• the outer shell and the inner walls comprise an upper peripheral portion and a lower peripheral portion made of non-reinforced polymer material and a central portion made of reinforced polymer material.
• the fixing base is made of non-reinforced polymer material or reinforced polymer material.
• the energy absorber device comprises:
• a first outer envelope is hollowed towards the bumper beam so as to form a first cavity
• the intermediate base, the first outer shell and the second outer shell are made of non-reinforced polymer material, and the inner walls of the first cavity and the second cavity are made of reinforced polymer material .
• the intermediate base, the first outer casing and the inner walls e the first cavity are made of unreinforced polymer material, and the second outer casing and the intersecting inner walls of the second cavity are made made of reinforced polymer material.
• the energy absorbing device comprises: a base for attachment to a vehicle spar and rows of honeycomb structures extending from the attachment base to the opposite end of the device energy absorber in connection with the bumper beam, the fixing base and the honeycomb structures being made of non-reinforced polymer material, and
• a sinuous wall at least partially surrounding the honeycombed structure rows and extending from the fixing base to the opposite end of the energy absorber device in connection with the bumper beam, the sinuous wall being made of reinforced polymer material.
• FIG. 1 shows a schematic representation of a bumper beam and an energy absorber device
• FIG. 2a shows a longitudinal section along the sectional axis AA of the energy absorber device of FIG. 1 according to a first embodiment
• FIG. 2b shows a cross-section along the sectional axis BB of the energy-absorbing device of FIG. 1 according to a first variant of the first embodiment
• FIG. 2c shows a cross-section along the sectional axis BB of the energy-absorbing device of FIG. 1 according to a second variant of the first embodiment
• FIG. 3a shows a longitudinal section along the sectional axis AA of the energy-absorbing device of FIG. 1 according to a second embodiment
• FIG. 3b shows a cross section along the sectional axis BB of the energy absorber device of FIG. 1 according to a first variant of the second embodiment
• FIG. 3c shows a cross-section along the sectional axis BB of the energy-absorbing device of FIG. 1 according to a second variant of the second embodiment
• FIG. 4a shows a longitudinal section along the sectional axis AA of the energy absorber device of FIG. 1 according to a third embodiment
• FIG. 4b shows a cross-section along the sectional axis BB of the energy-absorbing device of FIG. 1 according to the third embodiment
• FIG. 5a shows a longitudinal section along the sectional axis AA of the energy-absorbing device of FIG. 1 according to a fourth embodiment
• FIG. 5b shows a cross-section along the sectional axis BB of the energy-absorbing device of FIG. 1 according to the fourth embodiment
• FIG. 6a shows a longitudinal section along the sectional axis AA of the energy absorber device of FIG. 1 according to a fifth embodiment
• FIG. 6b shows a cross-section along the sectional axis BB of the energy-absorbing device of FIG. 1 according to the fifth embodiment
• FIG. 7 shows a diagram of the evolution of the resistance to deformation of the energy absorber device as a function of its contraction.
• first element or second element as well as first parameter and second parameter or else first criterion and second criterion, etc.
• first criterion and second criterion etc.
• it is a simple indexing to differentiate and name elements or parameters or criteria close but not identical.
• This indexing does not imply a priority of one element, parameter or criterion with respect to another, and it is easy to interchange such denominations without departing from the scope of the present description.
• This indexing does not imply either an order in time for example to appreciate this or that criterion.
• Motor vehicles are generally provided with a bumper beam 2 disposed on the front face. As shown in Figure 1, this bumper beam 2 can be attached to a spar 3 of the vehicle.
• the bumper beam 2 may comprise energy absorber devices 1 which make the connection between the bumper beam 2 and the ends of the longitudinal members 3 facing said bumper beam 2. These energy absorbing devices 1 deform according to a programmed deformation when the impact energy reaches a certain level in order to absorb this energy.
• the energy-absorbing device 1 comprises at least a first zone 21 made of a non-reinforced polymer material and at least a second zone 22, 23, 24 made of a reinforced polymer material comprising fibers.
• unreinforced polymer material it is meant that the unreinforced polymer material does not comprise fibers.
• an energy absorber device 1 comprising a first zone 21 made of a material having a first shock absorption property and a second zone 22, 23, 24 made of a material having a second property. shock absorption.
• the energy absorbing device 1 according to the invention is such that the first zone 21 and the second zone 22, 23, 24 have different shock absorption properties, or in other words, the non-reinforced polymer material. of the first zone 21 has a property, or profile, or ability or shock absorption capacity different from the reinforced polymer material comprising fibers of the second zone 22, 23, 24.
• only the polymer material reinforced includes fibers.
• the non-reinforced polymer material of the first portion 21 may be selected from polypropylene and polyamide.
• the reinforced polymer material of the second portion 22, 23, 24 which may in turn also comprise polypropylene or polyamide.
• the fibers of the reinforced polymeric material may in particular be glass fibers or carbon fibers. These fibers may be staple fibers and thus allow the manufacture of an energy absorber device 1 by injection.
• the fibers may be continuous fibers and allow the manufacture of an energy absorbing device 1 by thermoforming.
• FIGS. 2a to 6b separations are represented between the different zones 21, 22, 23 and 24. These separations are illustrative in order to mark the difference of matter between these zones 21, 22, 23 and 24. In reality, these Zones 21, 22, 23 and 24 are continuous and may have no visible demarcation due to the manufacturing process of the energy absorbing device 1, for example by bi-material injection or thermoforming.
• the energy-absorbing device 1 comprises:
• the outer casing 52 and the inner walls 53 extend from the fastening base 51 to the opposite end of the energy absorbing device 1 in connection with each other. with the bumper beam 2.
• the fixing base 51 may in particular comprise orifices 510 in order to be fastened for example by means of bolts to the spar 3.
• the fastening base 51 and the outer casing 52 hollow are made of non-reinforced polymer material.
• the inner walls 53 are made of reinforced polymer material. These internal walls 53 are here interwoven rectilinear walls which connect the inner faces of the outer casing 52. It is nevertheless possible to have different internal wall shapes 53, for example inner walls 53 which do not intersect and which are rectilinear and parallel to each other or walls having a sinusoidal section within the hollow of the outer casing 52.
• the fastening base 51 is made of non-reinforced polymer material.
• the outer shell 52 and the inner walls 53 comprise for their part:
• An upper peripheral portion 54a and a lower peripheral portion 54b made of non-reinforced polymer material
• a central portion 54c disposed between the upper peripheral portion 54a and the lower peripheral portion 54b and made of reinforced polymer material.
• peripheral portions 54a and 54b are placed on either side of the central portion 54c.
• the energy-absorbing device 1 comprises elements of the same shape as in the first embodiment with the difference that the materials in which they are made may be different.
• the fastening base 51 and the inner walls 53 intertwined are made of reinforced polymer material.
• the outer shell 52 is hollow made of non-reinforced polymer material.
• the fastening base 51 is made of reinforced polymer material.
• the outer shell 52 and the inner walls 53 comprise for their part:
• An upper peripheral portion 54a and a lower peripheral portion 54b made of non-reinforced polymer material
• a central portion 54c disposed between the upper peripheral portion 54a and the lower peripheral portion 54b and made of reinforced polymer material.
• FIGS. 4a and 4b show a third embodiment where the energy absorber device 1 comprises:
• a first outer envelope 52a is hollowed towards the bumper beam so as to form a first cavity 7a
• the energy absorbing device 1 comprises fixing lugs 512 comprising orifices 510 in order to be fixed for example by means of bolts to the spar 3.
• the intermediate base 55, the first outer shell 52a and the second outer shell 52b are made of non-reinforced polymer material.
• the inner walls 53a, 53b intersecting the first cavity 7a and the second cavity 7b are made of reinforced polymer material.
• Figures 5a and 5b show a fourth embodiment where the energy absorber device 1 comprises the same elements as in the third embodiment with the difference that the materials in which they are made may vary.
• the intermediate base 55, the first outer casing 52a and the inner walls 53a intersecting the first cavity 7a are made of non-reinforced polymer material.
• the second outer envelope 52b and the inner walls 53b intersecting the second cavity 7b are made of reinforced polymer material.
• the energy absorber device may comprise:
• a serpentine wall 58 at least partially surrounding the rows of honeycomb structure 56 and extending from the attachment base 51 to the opposite end of the energy absorbing device 1 in association with the bumper beam, the wall serpentine 58 being made of reinforced polymer material, more particularly an impregnated continuous fiber textile sheet.
• the fastening base 51 may in particular comprise orifices 510 in order to be fastened for example by means of bolts to the spar 3.
• FIG. 7 shows the effects and advantages of this particular composition of the energy absorbing device 1 according to the invention.
• FIG. 7 shows a diagram of the evolution of the contraction of an energy absorber device 1 as a function of its resistance to deformation.
• Curve X shows this evolution for a device energy absorber 1 made entirely of a plastic material such as polypropylene.
• Y curve shows this evolution for a device energy absorber 1 according to the invention.
• This peak corresponds to the initial amount of energy required for the energy absorbing device 1 to begin to deform.
• the peak Y1 of the energy absorber device 1 according to the invention is greater than the peak XI of the energy absorber device 1 made of plastic. This indicates that the energy absorbing device 1 according to the invention begins to deform only for shocks whose amount of energy is greater than that of the shocks that deform the plastic energy absorber device 1.
• This higher peak Y1 makes it possible in particular to prevent the energy-absorbing device 1 from beginning to deform during low-energy shocks, for example a shock at low speed, and thus to prevent the user from having to change the absorbers of the energy absorbers. energy 1.
• the difference ⁇ between the peak deformation resistance of the peak and the average of the deformation resistance of the curve Y is greater than the difference ⁇ of the curve X.
• the first zone 21 made of a non-reinforced polymer material which gives the energy absorber device 1 good ductility
• the second zone 22, 23, 24 made of a reinforced polymer material comprising fibers which gives the energy absorbing device 1 good strength and rigidity.
• the use of a reinforced polymer material and a non-reinforced polymer material makes it possible to limit the mass of the energy absorbing device 1.
• the energy absorber device 1 because of the presence of a first zone 21 made of an unreinforced polymer material and of at least a second zone 22, 23, 24, made of fiber-reinforced polymer material, retains a good lightness while being able to absorb more energy from possible shocks and while having a better resistance to low energy shocks.

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Citations (4)

• 2016
  • 2016-12-13 FR FR1662346A patent/FR3059958B1/fr active Active
• 2017
  • 2017-12-11 WO PCT/FR2017/053489 patent/WO2018109342A1/fr active Application Filing
  • 2017-12-11 CN CN201790001504.2U patent/CN211943206U/zh active Active

Patent Citations (4)

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